JP2011248152A - Display device and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device which has a plurality of display screens and is capable of displaying without compromising visibility and display image quality seen from a user while saving power.SOLUTION: A control part 100 generates display information describing the content to be displayed on a first display part 11 and a second display part 21. Furthermore the control part 100 performs a display mode determination processing and determines a display mode of the second display part 21. The control part 100 stores the display information generated by the control part 100 in a display memory part 60 and refreshes/transfers it to the first display part 11 and the second display part 21. When the display mode of the second display part 21 turns to a memory display mode as a result of an instruction by an application or the display mode determination processing by the control part 100, the control part 100 stores the display information in a memory within pixels of the second display part 21 and switches the second display part 21 to memory display from the memory within pixels.

Description

  The present invention relates to a display device and a program, and more particularly to a display device and a program suitable for a mobile terminal that displays on two or more screens.

  In mobile terminals such as mobile phones and portable game machines in recent years, the display screen size has been increasing due to user requests for applications such as Web browsing, still image display, and moving image display. However, for example, in the case of a mobile phone, the size of the housing must be a certain size (about 5 cm in width) or less from the viewpoint of the size that can be comfortably carried in a pocket. About 3.5 inches is the maximum. Also, in the case of a portable game machine or the like, there is a size limit due to the characteristics that the user carries it.

  On the other hand, as a proposal for making the display screen size larger, a method has been developed in which the display screen is made into two screens and is folded to connect the two screens at the time of display so as to make the display larger.

  Patent Document 1 discloses a liquid crystal display device that displays two pieces of information with different rewrite frequencies on two structures of liquid crystal with low power consumption. The liquid crystal display device disclosed in Patent Document 1 includes a liquid crystal panel that is always driven to perform display and a liquid crystal panel having a memory operation mode.

JP 2003-029242 A

  However, the increase in the display screen and the use of a plurality of display screens increase the power related to the display and shorten the battery usable time.

  With the technology according to Patent Document 1, the visibility and display image quality seen by the user are not impaired, and display with low power is not possible.

  The present invention has been made in view of the above circumstances, and in a display device having a plurality of display screens, a display device capable of displaying with low power without impairing the visibility and display image quality viewed from the user. The purpose is to provide.

In order to achieve the above object, a display device according to the first aspect of the present invention provides:
A first housing having one or more display screens;
A second housing movably coupled to the first housing and having one or more display screens,
At least one of the display screens is a display device having a memory display function for displaying information stored in a memory in a pixel,
First acquisition means for acquiring rewrite frequency information indicating the rewrite frequency of each display screen;
Second acquisition means for acquiring display information to be displayed on each display screen;
Normal display means for displaying the display information acquired by the second acquisition means on at least one of the display screens;
Memory display means for displaying display information stored in a memory in a pixel on a display screen having the memory display function;
Determining whether to display the display information acquired by the second acquisition unit or the display information stored in the memory in the pixel based on the rewrite frequency information on the display screen having the memory display function; Display control means for controlling the display based on the determination result,
The display control means further has the same display attribute of each display screen based on a condition of display information for display on the display screen having the memory display function.

In the above display device,
The display screen having the memory display function may be a memory liquid crystal in which the number of colors is limited when displaying information stored in a memory in a pixel.
The display control means determines whether or not character information is included in display information to be displayed on the display screen having the memory display function, and when character information is included, based on the character information It is desirable to include first determination means for calculating the number of points indicating the size of the displayed character and determining whether the number of points is smaller than a predetermined value.
When the first determination means determines that the number of points is smaller than a predetermined value, the second acquisition means is displayed on the display screen having the memory display function, similarly to the display screen not having the memory display function. It is desirable to display the acquired display information.

In the above display device,
When the display information to be displayed on the display screen having the memory display function includes character information, the display control means stores the display information stored in the memory in the pixel on the display screen having the memory display function. Is preferably displayed with the character color black and the background color white, or the character color white and the background color black.

In the above display device,
The first casing and the second casing may be provided with backlights corresponding to the respective display screens. In this case,
Third acquisition means for acquiring illuminance information indicating the illuminance of the surrounding environment of the display device;
Second determination means for determining whether or not each display information to be displayed on the display screen is linked;
Backlight control means for controlling the drive current of the backlight;
It is desirable to further comprise
The backlight control means includes
When the second determination unit determines that the display information to be displayed on the display screen is linked, the display screen displaying the linked display information has the same luminance based on the illuminance information. Control the drive current of the backlight so that
When the second determination unit determines that the display information to be displayed on the display screen is not linked, the display screen having the memory display function is a memory in a pixel based on the illuminance information. It is desirable to control the drive current of the backlight so that the display screen on which the display information stored in the display screen has a luminance with which minimum visibility can be obtained.

In the above display device,
The first acquisition unit compares the display information acquired last time by the second acquisition unit with the display information acquired this time, and whether the display information having the memory display function is the same display information for a predetermined period. Determine
The display control unit determines that the rewrite frequency is low when the first acquisition unit determines that the display information is the same for a predetermined period, and stores the display information having a memory display function in a memory in a pixel. It is desirable to display the displayed display information.

In the above display device,
The first acquisition means measures the no-operation time when there is no operation input from the user on the display screen having the memory display function, and determines whether the no-operation time is longer than a predetermined value,
When the first acquisition unit determines that the no-operation time is longer than a predetermined value, the display control unit determines that the rewriting frequency is low, and displays the second acquisition on the display screen having the memory display function. It is desirable that the display information acquired last by the means is stored in the memory in the pixel and displayed, and then the display information acquired by the second acquisition means is displayed when there is an operation input from the user. .

In the above display device,
All display screens of the first housing and the second housing may have the memory display function, in this case,
It is desirable to further comprise detection means for detecting a style indicating the orientation of the display device,
The display control means detects the second display screen on one of the one or two display screens when the detection means detects a horizontal style that opens the first casing and the second casing sideways. It is desirable to display the display information acquired by the acquisition means, and store and display display information with a low rewrite frequency preset in the other one or two display screens in a memory in the pixel.

In the above display device,
When the detection unit detects that the detection unit is in a portrait orientation that opens the first housing and the second housing in a portrait orientation, the display control unit displays the one or two display screens on the one or two display screens. It is desirable to display the display information acquired by the second acquisition means, and store and display display information with a low rewrite frequency preset on the other one or two display screens in a memory in the pixel.

In the above display device,
In the case where the display information to be displayed on the display screen acquired by the second acquisition means is a book content that is a book content and its table of contents,
When the detection means detects that the horizontal style is selected, the display control means displays the book content on one of the one or two display screens, and the other one or two display screens. The table of contents is stored in a memory in a pixel and displayed,
When the detection means detects that the portrait style is set, the display control means causes the book content to be displayed on one or two display screens as viewed from the user, and the other one is displayed. Alternatively, it is desirable to display the table of contents on two display screens stored in a memory in a pixel.

In the above display device,
Each of the first casing and the second casing may have two display screens,
When the display information acquired by the second acquisition means is display information according to an instruction from a character input application,
The display control means includes two display screens on the upper side when viewed from the user among the four display screens of the first casing and the second casing based on the orientation of the display device detected by the detecting means. Display information according to the instruction of the character input application is displayed on the display screen, and the display information of the keyboard for the user to input characters in advance on the two display screens on the lower side when viewed from the user is stored in the memory in the pixel. It is desirable to store and display in

In the above display device,
When the display information to be displayed on the display screen having the memory display function acquired by the second acquisition means is a photographic image,
The display control means stores the photographic image acquired by the second acquisition means on the display screen in a memory in a pixel and displays the photographic image as the next display information when a predetermined time elapses. It is desirable that the display in one pixel is overwritten on the memory in each pixel.

In order to achieve the above object, a program according to the second aspect of the present invention is:
A first casing having one or two display screens; and a second casing movably connected to the first casing and having one or two display screens, and at least one of the display screens One is a computer that controls a display device having a memory display function for displaying information stored in a memory in a pixel.
A function of acquiring rewrite frequency information indicating the rewrite frequency of each display screen;
A function for acquiring display information to be displayed on each display screen;
A function of displaying the acquired display information on each display screen;
A function of displaying display information stored in a memory in a pixel on a display screen having the memory display function;
Based on the rewriting frequency information, it is determined whether to display the acquired display information or display information stored in a memory in a pixel on the display screen having the memory display function, and based on the determination result A function to control the display;
A function of making at least one display attribute of each display screen the same based on a condition of display information for display on the display screen having the memory display function;
It is characterized by realizing.

  ADVANTAGE OF THE INVENTION According to this invention, in the display apparatus with a some display screen, the display apparatus which can be displayed by low power without impairing the visibility and display image quality which were seen from the user can be provided.

1 is a diagram illustrating an example of an external configuration of a display device according to Embodiment 1. FIG. It is a block diagram which shows the internal structural example of the display apparatus shown in FIG. It is a functional block diagram which shows the function structural example implement | achieved by the control part shown in FIG. It is a figure which shows the relationship between the display information which concerns on Embodiment 1, a division | segmentation method, and a display image. 3 is an example of a backlight drive current table according to the first embodiment. 3 is a flowchart illustrating an example of an operation of display processing according to the first embodiment. 6 is a flowchart illustrating an example of an operation of a display mode determination process according to the first embodiment. 4 is a flowchart illustrating an example of an operation of a backlight drive determination process according to the first embodiment. It is a flowchart which shows an example of the operation | movement of the display process which concerns on Embodiment 2 of this invention. 12 is a flowchart illustrating an example of an operation of a backlight drive determination process according to the second embodiment. It is a functional block diagram which shows the function structural example implement | achieved by the control part which concerns on Embodiment 3 of this invention. 14 is a flowchart illustrating an example of an operation of display processing according to the third embodiment. It is a block diagram which shows the internal structural example of the display apparatus which concerns on Embodiment 4 of this invention. It is a figure which shows the example of the style which the display apparatus which concerns on Embodiment 4 can take. It is a figure which shows the example of a display according to time passage in each style of the display apparatus which concerns on Embodiment 4. FIG. FIG. 10 is a diagram illustrating a display example when a book viewer application is activated in the display device according to the fourth embodiment. 10 shows a display example when a photo viewer application is activated in a display device according to a fourth embodiment. 14 is a flowchart illustrating an example of an operation of display processing according to the fourth embodiment. It is a figure which shows the example of an external appearance structure of the display apparatus which concerns on Embodiment 5 of this invention. FIG. 20 is a block diagram illustrating an internal configuration example of the display device illustrated in FIG. 19. It is a figure which shows the example of the style which the display apparatus which concerns on Embodiment 5 can take. It is a figure which shows the relationship between the display information which concerns on Embodiment 5, a division | segmentation method, and a display image. 14 is a flowchart illustrating an example of an operation of display processing according to the fifth embodiment. 14 is a flowchart illustrating an example of operation of determination display processing according to the fifth embodiment. It is a block diagram which shows the example of an internal structure of the display apparatus concerning Embodiment 6 of this invention. FIG. 26 is a diagram showing examples of styles and display screens that the display device shown in FIG. 25 can take. 18 is a flowchart illustrating an example of an operation of display processing according to the sixth embodiment.

  Embodiments according to the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals. It should be noted that the present invention is suitable for application to electronic devices with a limited display screen size, such as mobile communication terminals such as mobile phones, portable game machines, PDAs and small personal computers.

  In the present invention, the display information condition is that the display information to be displayed on the display screen having the memory display function includes character information, and the size of the character displayed based on the character information. That is, the number of points to be shown is smaller than a predetermined value, and each display information on a plurality of display screens is linked. Making the display attributes the same means that all of the plurality of display screens are normally displayed or the backlight drive current is controlled so that the display screens have the same luminance.

(Embodiment 1)
Hereinafter, a case where the display device according to the present invention is applied to a mobile communication terminal will be described as an example. FIG. 1 is a diagram showing an appearance of a mobile communication terminal 1 according to the present embodiment. As shown in the figure, the mobile communication terminal 1 according to the present embodiment has a first housing 10 and a second housing 20, and the first housing 10 and the second housing 20 are, for example, It is movably connected by a hinge or the like.

  That is, the mobile communication terminal 1 includes a housing structure having a so-called foldable opening / closing mechanism. The first housing 10 and the second housing 20 having such an opening / closing mechanism are in a completely open state (a spread angle of 180 degrees) from a state where the display surface is completely closed (a spread angle of 0 degrees). ).

  Here, the first casing 10 includes a first display unit 11 and a first input unit 12 (details will be described later), and the second casing 20 includes a second display unit 21 and a second input unit 22 (details). (To be described later).

  In addition, an illuminance detection unit 50 (described in detail later) including an optical sensor that can detect the illuminance of the surrounding environment is mounted on the substrate in the first housing 10, and the optical sensor is exposed on the display surface side. It is configured as follows.

  The internal configuration of the mobile communication terminal 1 having such an external configuration will be described with reference to FIG. FIG. 2 is a block diagram illustrating an internal configuration example of the mobile communication terminal 1 according to the present embodiment. As illustrated, the mobile communication terminal 1 includes a first display unit 11, a first input unit 12, a first backlight 13, a second display unit 21, a second input unit 22, a second backlight 23, and illuminance detection. Unit 50, display memory unit 60, storage unit 70, control unit 100, and the like.

  The first display unit 11 is a display device composed of, for example, a transflective liquid crystal display panel having a size of HVGA (Half VGA (Half VGA)) and displays display information refreshed and transferred from the control unit 100. indicate.

  The first input unit 12 includes, for example, a capacitance-type or pressure-sensitive contact sensor. In the present embodiment, the first input unit 12 is formed on the display screen of the first display unit 11 to form the first display unit 11. It functions as a collaborative touch panel and accepts operation input from the user.

  The first backlight 13 is composed of, for example, a light emitting device such as an LED (Light Emitting Diode), and illuminates the display panel of the first display unit 11 from the back surface (back surface) side. In this embodiment, the 1st backlight 13 shall be comprised by the LED array in which several LED was arranged.

  The second display unit 21 is a display device composed of an HVGA size transflective liquid crystal display panel or the like similar to the first display unit 11, but unlike the first display unit 11, each pixel has 1 bit of RGB. This is a display device having a memory and capable of so-called memory display.

  Since the second display unit 21 according to the present embodiment has such a memory displayable configuration (memory display function), the display information display (hereinafter referred to as “normal display”) refreshed from the control unit 100 is displayed. It is possible to switch between 8 colors display (hereinafter referred to as “memory display”) from the memory in each pixel of the second display unit 21 without refresh transfer from the control unit 100. It has become.

  That is, in the display operation according to the second display unit 21, a plurality of display modes can be switched and controlled. Hereinafter, a mode for displaying the display information refreshed and transferred is referred to as a “normal display mode”. A display mode that does not require refresh transfer using the memory display function is referred to as a “memory display mode”.

  The second input unit 22 includes, for example, a capacitance-type or pressure-sensitive contact sensor. In the present embodiment, the second input unit 22 is formed on the display screen of the second display unit 21, thereby It functions as a collaborative touch panel and accepts operation input from the user.

  The 2nd backlight 23 is comprised from light-emitting devices, such as LED, for example, and illuminates the display panel of the 2nd display part 21 from the back surface (back surface) side. In the present embodiment, it is assumed that the second backlight 23 is configured by an LED array in which a plurality of LEDs are arranged.

  The illuminance detection unit 50 includes, for example, an optical sensor and detects the brightness (illuminance) of the surrounding environment of the mobile communication terminal 1.

  The display memory unit 60 includes, for example, a storage device such as a RAM (Random Access Memory) or a VRAM (Video RAM), and is used as a frame buffer for a display operation.

  The storage unit 70 is configured by a storage device such as a flash memory, for example, and stores an operation program executed by the control unit 100 and data.

  The control unit 100 includes, for example, a CPU (Central Processing Unit) and a RAM (Random Access Memory) serving as a work area. The control unit 100 controls each unit of the mobile communication terminal 1 and stores in the storage unit 70. By executing the stored operation program, the function as shown in FIG. 3 is realized, and each process described later is executed. FIG. 3 is a functional block diagram illustrating functions realized by the control unit 100.

  In the present embodiment, the control unit 100 functions as a display information generation unit 111, a display mode determination unit 112, a display control unit 113, a backlight control unit 114, and the like by executing the operation program.

  The display information generation unit 111 generates display information indicating the contents to be displayed on the first display unit 11 and the second display unit 21.

  The display mode determination unit 112 performs a display mode determination process, which will be described later, and determines the display mode of the second display unit 21.

  The display control unit 113 frame-buffers the display information generated by the display information generation unit 111 in the display memory unit 60 and performs refresh transfer to the first display unit 11 and the second display unit 21. Further, when the display mode of the second display unit 21 is changed to the memory display mode by the application instruction or the display mode determination process of the display mode determination unit 112, the display information is stored in the memory in the pixel of the second display unit 21. And the second display unit 21 is switched to the memory display from the memory in the pixel.

  Details of the display control by the display control unit 113 will be described with reference to FIG. FIG. 4 is a diagram illustrating a relationship among display information, a division method, and a display image according to the first embodiment.

  When both the first display unit 11 and the second display unit 21 display in the normal mode, the display control unit 113, as shown in FIG. 4, from the size and orientation of the display information image received from the display information generation unit 111, A method for dividing and rearranging the display image is determined, the display image is divided and rearranged, and the display memory unit 60 (frame buffer) is developed.

  Here, the display content update of the application and the display information update by the display information generation unit 111 are performed at 30 Hz, for example. In this case, every time display information is received from the display information generation unit 111, the display control unit 113 divides the display image and rearranges the data, and updates the display memory unit 60. The display control unit 113 refresh-transfers display information to be displayed on the first display unit 11 and the second display unit 21 developed in the display memory unit 60 to each display unit at RGB888 · 60 Hz. The first display unit 11 and the second display unit 21 display the display information refreshed and transferred.

  For example, when the display information generation unit 111 generates a horizontally long VGA image having a size of W640 × H480 as display information, the division method is “vertical division”. The display image displayed on the first display unit 11 is an image on the left side of the original image (size: W320 × H480), and the display image displayed on the second display unit 21 is an image on the right side of the original image (size: W320 × H480). H480).

  When displaying on the second display unit 21 in the normal display mode, the display control unit 113 displays the information created by the display information generation unit 111 on the first display unit 11 and the second display unit 21. FIG. As shown in FIG. 5, the display image division and data rearrangement method are determined from the size and orientation of the image, and the division and rearrangement are performed, and the display memory unit 60 is developed.

  Thereafter, the update of the display contents of the application and the update of the display information from the display information generation unit 111 are performed at 30 Hz, and each time the display control unit 113 divides the display image and rearranges the data, the display memory unit 60 Update. Then, the display control unit 113 refresh-transfers the display information of the first display unit 11 and the second display unit 21 developed in the display memory unit 60 to each display unit at RGB888 · 60 Hz, and performs the first display. The unit 11 and the second display unit 21 display the content of the refreshed data.

  On the other hand, when displaying on the second display unit 21 in the memory display mode, the display control unit 113 displays the display information received from the display information generation unit 111 from the size and orientation of the image as shown in FIG. The image division and data rearrangement method are determined, the division and rearrangement are performed, and the image is developed in the display memory unit 60.

  At this time, the display control unit 113 leaves only the most significant bit of the 8-bit data of each RGB pixel of the display information to be displayed on the second display unit 21, and displays the data as RGB 111 (= 8 color display) data. Expand to. At this time, processing for smoothing edges by dither processing or the like may be added.

  Thereafter, the display content update of the application and the display information update by the display information generation unit 111 are performed at 30 Hz only for the HVGA size display image for the first display unit 11, and the display control unit 113 The display memory unit 60 is updated only for the 11 display information. Then, the display control unit 113 refresh-transfers only the display information on the first display unit 11 developed in the display memory unit 60 to the first display unit 11 with RGB888 / 60 Hz, and the RGB 111 to the second display unit 21. The image is transferred to the second display unit 21 only once. At that time, the first display unit 11 displays the contents of the refreshed data, the second display unit 21 stores the obtained display information in the memory in the pixel, and the memory in the pixel of the second display unit 21. Switch to memory display from.

  Thereafter, until the memory display mode ends, the display information generation unit 111 generates only the display information of the first display unit 11 and transfers it at 30 Hz, and the display control unit 113 also displays on the first display unit 11. Only the information is transferred to the first display unit 11 at RGB888 · 60 Hz.

  Returning to FIG. 3, the description of the functional configuration realized by the control unit 100 will be continued.

  The backlight control unit 114 controls the backlight in each display unit in cooperation with the illuminance detection unit 50. In the present embodiment, the backlight is controlled by referring to the backlight drive current table as shown in FIG.

  FIG. 5 shows an example of the backlight drive current table according to the first embodiment. In this embodiment, it is assumed that such a backlight drive current table is stored in the storage unit 70.

  As shown in FIG. 5 (a), the backlight drive current table is configured by ambient ambient illuminance (environmental luminance) set in advance and a current that flows per corresponding backlight LED. The current that flows per one backlight LED is divided into a case where priority is given to visibility and a case where priority is given to low power consumption operation.

  Here, in the normal display mode, priority is given to visibility. That is, in the example of FIG. 5A, in the normal display mode, the location where the “environment luminance” row corresponding to the ambient illumination information acquired by the illumination detection unit 50 and the “visibility priority” column intersect. Is the current value that flows per LED of the backlight.

  In the case of the memory display mode, it is determined whether or not the display information on the second display unit 21 is linked with the display information on the first display unit 11. For example, an instruction is given when the display information of the second display unit 21 is created by an application different from the display information of the first display unit 11 or by the same application but the display information is independent by the application. In some cases, it is determined that the display information on the second display unit 21 is independent of the display information on the first display unit 11.

  On the other hand, when the display information of the second display unit 21 is created by the same application as the display information of the first display unit 11 and there is no instruction that the display information is independent from the application, the second display It is determined that the display information of the unit 21 is linked with the display information of the first display unit 11.

  In the present embodiment, when it is determined that the display information on the second display unit 21 is independent of the display information on the first display unit 11, priority is given to operating with low power consumption. In this case, referring to the backlight drive current table in the example of FIG. 5A, a row of “environmental luminance” corresponding to the environmental illuminance information acquired by the illuminance detection unit 50, and a column of “low power consumption priority” The value at the location where the crosses are taken as the current value that flows per LED of the backlight.

  On the other hand, when it is determined that the display information on the second display unit 21 is linked with the display information on the first display unit 11, the visibility is given priority. In this case, referring to the backlight drive current table in the example of FIG. 5A, there is a row of “environmental luminance” corresponding to the environmental illuminance information acquired by the illuminance detection unit 50 and a column of “visibility priority”. The value at the intersection is the current value that flows per LED of the backlight.

  Further, when the characteristics of the first display unit 11 and the second display unit 21 are different and the luminance of the display surface is not the same with the same drive current, the characteristics of the respective display units as shown in FIG. In addition, a backlight driving current table having substantially the same surface luminance is prepared in advance, and a column dedicated to each display unit of the table is referred to.

  The backlight control unit 114 controls and turns on the first backlight 13 and the second backlight 23 so as to operate with the value of the backlight driving current obtained by referring to the backlight driving current table.

  Each configuration of the mobile communication terminal 1 described above is a configuration necessary for realizing the present invention, and other configurations necessary for basic functions as the mobile communication terminal and configurations necessary for various additional functions. Etc. shall be provided as necessary.

  The display operation in the mobile communication terminal 1 configured as described above will be described with reference to the flowchart shown in FIG. FIG. 6 is a flowchart illustrating an example of the operation of the display process (“display process 1”) according to the first embodiment. This process starts when the application is activated.

  When the user inputs an operation to the first input unit 12 or the second input unit 22 and starts the application, first, the display information generation unit 111 first displays the first VGA size or the first HVGA size according to an instruction from the application. Display information to be displayed on the display unit 11 and the second display unit 21 is generated (step S11).

  Then, the display mode determination unit 112 determines whether there is a designation of the display mode of the second display unit 21 from the application (step S12). From the type of content displayed on the second display unit 21, for example, in the case of video display or Web display with animation, information is frequently updated, so normal display, still image, keyboard for character input, etc. In the case of the fixed display, the display mode can be designated by whether or not the display content is frequently updated by itself, such as a memory display because the information is not updated frequently.

  When the display mode of the second display unit 21 is designated from the application (step S12; NO), the display mode determination unit 112 determines whether or not the designation is the normal display mode (step S16).

  When the designation from the application is the normal display mode (step S16; YES), the display mode determination unit 112 notifies the display control unit 113 to that effect. In this case, the display control unit 113 normally displays the display information generated by the display information generation unit 111 on the first display unit 11 and the second display unit 21 (step S17).

  On the other hand, when the designation from the application is not the normal display mode (step S16; NO), the display mode determination unit 112 notifies the display control unit 113 to that effect, and in this case, the display control unit 113 displays the first display unit 11 on the screen. The display information generated by the display information generation unit 111 is normally displayed and displayed on the second display unit 21 in memory (step S15).

  When the display mode of the second display unit 21 is not specified by the application (step S12; YES), the display mode determination unit 112 performs a “display mode determination process” and the display mode of the second display unit 21. Is determined (step S13). Details of the “display mode determination process” will be described later.

  When the display mode of the second display unit 21 determined by the display mode determination unit 112 is the memory display mode (step S14; YES), the display control unit 113 generates the display information generation unit 111 in the first display unit 11. The displayed display information is normally displayed and displayed on the second display unit 21 in memory (step S15).

  On the other hand, when the display mode of the second display unit 21 determined by the display mode determination unit 112 is not the memory display mode (step S14; NO), the display control unit 113 displays the first display unit 11 and the second display unit. The display information generated by the display information generation unit 111 is normally displayed on the display 21 (step S17).

  For example, when it is clear that the frequency of information update is low from the beginning, such as a keyboard display in a character input application, the application first displays screen information created by the display information generation unit 111 using two HVGA screens. Thus, for the first display unit 11 (RGB888) and for the second display unit 21 (RGB111 = 8 colors), the first display unit 11 designates the normal display mode, the second display unit 21 designates the memory display mode, and the display Process.

  Next, the backlight control unit 114 executes a “backlight drive determination process” for calculating the value of the backlight drive current (step S18), and the first drive current obtained as a result of the backlight drive determination process is used. The 1 backlight 13 and the 2nd backlight 23 are lighted simultaneously (step S19). Details of the “backlight drive determination process” will be described later.

  If the application has not ended (step S20: NO), the process returns to step S11, and steps S11 to S20 are repeated. When the application is terminated (step S20: YES), the process is terminated.

  Details of the display mode determination process executed in the above-described “display process 1” will be described with reference to FIG. FIG. 7 is a flowchart illustrating an example of the operation of the display mode determination process (“display mode determination process 1”) according to the first embodiment. “Display mode determination process 1” in FIG. 7 is a process defined in step S13 of “display process 1” shown in FIG.

  When the process starts, first, the display mode determination unit 112 compares the previous display information with the current display information for the display information transferred to the display control unit 113 at 30 Hz (step S21).

  If the previous display information and the current display information are not the same (step S22; NO), it is determined that the information update frequency is high, and the display mode of the second display unit 21 is determined as the normal display mode ( Step S29), the process is terminated.

  Here, in the case of the first transfer, it is determined that the frequency of information update is high as “no previous display information”, and the normal display mode is set. When the previous display information is the same as the current display information (step S22; YES), the display mode determination unit 112 counts the number of times (+1) that are the same (step S23). If the counted number does not match the predetermined number (step S24; NO), the process returns to step S21, and steps S21 to S24 are repeated.

  On the other hand, if the counted number matches the predetermined number (step S24; YES), the display mode determination unit 112 determines that the display information update frequency is low, and whether the display information includes character information. Is determined (step S25). If the display information does not include character information (step S25; NO), the display mode determination unit 112 determines that the display mode of the second display unit 21 is the memory display mode (step S30), and ends the process. .

  When the display information includes character information (step S25; YES), the display control unit 113, for example, displays black for the display information (R = 0, G = 0, B = 0), the background Is corrected to be white (R = 255, G = 255, B = 255) (step S26).

  This is because when the memory display mode is performed, the number of colors to be displayed is reduced from about 65,000 colors in the normal display mode (RGB888) to 8 colors in the memory display mode (RGB111). In the character information, when the most significant bit of each color disappears in a light color character, or when the most significant bit is 1 or more in both character information and the background, the character This is correction that can reduce deterioration in visibility due to a decrease in contrast due to the primary colors of the background. For example, correction may be performed so that the character color is white and the background color is black. That is, the combination of the character color and the background color is arbitrary as long as the deterioration in visibility due to a decrease in contrast can be reduced.

  Next, the display mode determination unit 112 calculates the number of points of characters displayed on the actual display surface from the character information, the dpi (dot per inch) information of the display unit to be displayed, and the enlargement / reduction ratio. (Step S27).

  When the character display size is equal to or less than the predetermined number of points (step S28; YES), the display mode determination unit 112 performs the 8-color subtraction process to erase the character outline information and reduce the contrast in the memory display mode. It is determined that the visibility is lowered, the display mode of the second display unit 21 is determined to be the normal display mode (step S29), and the process is terminated.

  If the character display size is not less than the predetermined number of points (step S28; NO), it is determined that the visibility is not lowered even in the memory display mode, and the display mode of the second display unit 21 is determined to be the memory display mode (step). S30), the process is terminated.

  Next, details of the backlight drive determination process executed in the “display process 1” described above will be described with reference to the flowchart shown in FIG. FIG. 8 is a flowchart illustrating an example of the operation of the backlight drive determination process (“backlight drive determination process 1”) according to the first embodiment. “Backlight drive determination processing 1” in FIG. 8 is processing defined in step S18 of “display processing 1” shown in FIG.

  When the process is started, the backlight control unit 114 first acquires illuminance information indicating the brightness of the surrounding environment detected by the optical sensor from the illuminance detection unit 50 (step S31).

  Next, the backlight control unit 114 makes an inquiry to the display control unit 113 to determine whether or not the current display mode of the second display unit 21 is the memory display mode (step S32).

  When the display mode of the second display unit 21 is not the memory display mode (step S32; NO), the backlight control unit 114 refers to the visibility priority parameter of the backlight drive current table (step S34). And the backlight control part 114 acquires the value of a backlight drive current (step S36), and complete | finishes a process.

  On the other hand, when the display mode of the second display unit 21 is the memory display mode (step S32; YES), the backlight control unit 114 is linked with the display information of the first display unit 11 and the second display unit 21. It is determined whether or not (step S33).

  When the display information of the first display unit 11 and the second display unit 21 is linked (step S33; YES), that is, the display information of the second display unit 21 is the same as the display information of the first display unit 11. If there is no instruction that the display information is independent from the application, the backlight control unit 114 refers to the visibility priority parameter of the backlight drive current table (step S34). And the backlight control part 114 acquires the value of a backlight drive current (step S36), and complete | finishes a process.

  On the other hand, when the display information of the 1st display part 11 and the 2nd display part 21 is independent (step S33; NO), that is, the display information of the 2nd display part 21 differs from the display information of the 1st display part 11. If the backlight control unit 114 is created by the application or created by the same application but the display information is instructed by the application, the backlight control unit 114 gives priority to low power consumption in the backlight drive current table. The parameter is referred to (step S35). And the backlight control part 114 acquires the value of a backlight drive current (step S36), and complete | finishes a process.

  As described above, by applying the present invention as in the above-described embodiment, a display device having two display screens can be displayed with low power without impairing the visibility and display image quality seen by the user. .

  In addition, by controlling the brightness of the backlight with reference to the above-described backlight driving current table, the first display unit 11 and the second display unit 21 are interlocked, or two display units have one When an image is displayed, the backlight of only one display unit is darkened, and deterioration of visibility in a state where the two display units are combined can be prevented. And when visibility does not deteriorate, it can display with low electric power by reducing the drive current of a backlight.

  Furthermore, a backlight drive current table having substantially the same surface luminance is prepared in advance according to the characteristics of each display unit, and the first display is made by referring to the column dedicated to each display unit of the table. Even when the characteristics of the unit 11 and the second display unit 21 are different and the first display unit 11 and the second display unit 21 are linked or when one image is displayed on the two display units, It is possible to prevent deterioration of visibility in a state where the two display units are combined due to the difference in display brightness of the display unit.

  In addition, the display information at the time of the previous transfer is compared with the current display information. If the display information is the same for a predetermined period, it is determined that the display information update frequency is low, and the display is reduced by switching to the memory display. The power can be displayed.

  In addition, when character information is included in the display information when the memory display mode is performed, the character color is black and the background color is white, so that the character disappears or the contrast decreases due to the 8-color reduction process. The deterioration of visibility due to can be reduced.

  Furthermore, the deterioration of visibility can be reduced by calculating the number of points of characters displayed on the actual display surface and not displaying the memory when the character display size is a predetermined number of points or less.

(Embodiment 2)
The mobile communication terminal 1 according to the second embodiment has the same configuration as that of the first embodiment, but in the second embodiment, not only the second display unit 21 but also the first display unit 11 includes 1 bit of RGB in each pixel. It is comprised from the display apparatus provided with the memory of memory display. That is, display information that is refresh-transferred from the control unit 100 is displayed on both the first display unit 11 and the second display unit 21, or eight colors are read from the memory in each pixel without refresh transfer from the control unit 100. It is possible to switch the display.

  A display operation by the mobile communication terminal 1 having such a configuration will be described with reference to a flowchart shown in FIG. FIG. 9 is a flowchart illustrating an example of the operation of the display process (“display process 2”) according to the second embodiment. This process starts when the application is activated.

  When the user inputs an operation to the first input unit 12 or the second input unit 22 to start an application, first, the display information generation unit 111 first displays the first VGA size or the second HVGA size according to the application instruction. Display information to be displayed on the display unit 11 and the second display unit 21 is generated (step S41).

  Then, the display mode determination unit 112 determines whether or not the designation of the display mode of the first display unit 11 is from an application (step S42). When there is a display mode designation application of the first display unit 11 (step S42; NO), the display mode determination unit 112 determines whether or not the designation is the normal display mode (step S46).

  When the designation from the application is the normal display mode (step S46; YES), the display mode determination unit 112 notifies the display control unit 113 accordingly. In this case, the display control unit 113 normally displays the display information generated by the display information generation unit 111 on the first display unit 11 (step S47).

  On the other hand, when the designation from the application is not the normal display mode (step S46; NO), the display mode determination unit 112 notifies the display control unit 113 to that effect, and in this case, the display control unit 113 notifies the first display unit 11 to that effect. The memory is displayed (step S45).

  On the other hand, when the display mode of the first display unit 11 is not specified by the application (step S42; YES), the display mode determination unit 112 performs a “display mode determination process” and the display mode of the first display unit 11 Is determined (step S43). The “display mode determination process” here is the same as the “display mode determination process 1” in the first embodiment shown in FIG.

  When the display mode of the first display unit 11 determined by the display mode determination unit 112 is the memory display mode (step S44; YES), the display control unit 113 displays the memory on the first display unit 11 (step S45). . On the other hand, when the display mode of the first display unit 11 determined by the display mode determination unit 112 is not the memory display mode (step S44; NO), the display control unit 113 displays the display information generated by the display information generation unit 111. Is normally displayed on the first display unit 11 (step S47).

  Next, the display mode determination unit 112 determines whether or not the display mode of the second display unit 21 is designated from the application (step S48).

  When the designation of the display mode of the second display unit 21 is from an application (step S48; NO), the display mode determination unit 112 determines whether or not the designated display mode is the normal display mode (step S52). . When the designation from the application is the normal display mode (step S52; YES), the display mode determination unit 112 notifies the display control unit 113 to that effect. In this case, the display control unit 113 normally displays the display information generated by the display information generation unit 111 on the second display unit 21 (step S53). On the other hand, when the designation from the application is not the normal display mode (step S52; NO), the display mode determination unit 112 notifies the display control unit 113 to that effect, and in this case, the display control unit 113 displays the second display unit 21. Is displayed in memory (step S51).

  When the display mode of the second display unit 21 is not specified by the application (step S48; YES), the display mode determination unit 112 performs “display mode determination processing” and sets the display mode of the second display unit 21. Determination is made (step S49). The “display mode determination process” here is the same as the “display mode determination process 1” in the first embodiment shown in FIG.

  When the display mode of the second display unit 21 determined by the display mode determination unit 112 is the memory display mode (step S50; YES), the display control unit 113 displays the memory on the second display unit 21 (step S51). . On the other hand, when the display mode of the second display unit 21 determined by the display mode determination unit 112 is not the memory display mode (step S50; NO), the display control unit 113 displays the display information generated by the display information generation unit 111. Is normally displayed on the second display unit 21 (step S53).

  Next, the backlight control unit 114 performs a “backlight drive determination process” for calculating the value of the drive current of the backlight (step S54). Details of the “backlight drive determination process” will be described later.

  The backlight control unit 114 simultaneously turns on the first backlight 13 and the second backlight 23 with the drive current having the value acquired as a result of the backlight drive determination process (step S55). If the application has not ended (step S56: NO), the process returns to step S41, and steps S41 to S56 are repeated. When the application is terminated (step S56: YES), the process is terminated.

  Details of the “backlight drive determination process” executed in the “display process 2” will be described with reference to the flowchart shown in FIG. FIG. 10 is a flowchart illustrating an example of the operation of the backlight drive determination process (“backlight drive determination process 2”) according to the second embodiment. The backlight drive determination process in FIG. 10 is a process defined in step S54 of the display process 2 in FIG.

  When the process is started, first, the backlight control unit 114 acquires optical sensor information from the illuminance detection unit 50 (step S61). Next, the backlight control unit 114 makes an inquiry to the display control unit 113 to determine whether or not the current display mode of at least one of the first display unit 11 and the second display unit 21 is the memory display mode. (Step S62).

  If neither is the memory display mode (step S62; NO), the backlight control unit 114 refers to the visibility priority parameter in the backlight drive current table (step S65). And the backlight control part 114 acquires the value of a backlight drive current (step S67), and complete | finishes a process.

  On the other hand, when at least one of the display modes is the memory display mode (step S62; YES), the backlight control unit 114 determines whether the display information of the first display unit 11 and the second display unit 21 is linked. Determination is made (step S63).

  When the display information of the first display unit 11 and the second display unit 21 is independent (step S63; NO), the backlight control unit 114 refers to the low power consumption priority parameter in the backlight drive current table (step S63). S66). And the backlight control part 114 acquires the value of a backlight drive current (step S67), and complete | finishes a process.

  On the other hand, when the display information of the 1st display part 11 and the 2nd display part 21 has cooperated (step S63; YES), the backlight control part 114 is the display mode of the 1st display part 11 and the 2nd display part 21. It is determined whether or not both are in the memory display mode (step S64).

  When both are in the memory display mode (step S64; YES), the backlight control unit 114 refers to the low power consumption priority parameter in the backlight drive current table (step S66). And the backlight control part 114 acquires the value of a backlight drive current (step S67), and complete | finishes a process.

  On the other hand, when one of the first display unit 11 or the second display unit 21 is in the memory display mode (step S64; NO), the backlight control unit 114 refers to the visibility priority parameter of the backlight drive current table ( Step S65). And the backlight control part 114 acquires the value of a backlight drive current (step S67), and complete | finishes a process.

  As described above, by applying the present invention as in the above embodiment, in a display device having a plurality of display screens, even when all of the plurality of display screens can be switched between normal display and memory display, It is possible to display with low power without impairing the visibility and display image quality seen from the user.

(Embodiment 3)
FIG. 11 is a functional block diagram illustrating a functional configuration example realized by the control unit 100 of the mobile communication terminal 1 according to the third embodiment. In the mobile communication terminal 1 according to the third embodiment, in addition to the functional configuration according to each of the embodiments described above, the state determination unit 115 is realized by the control unit 100.

  The state discriminating unit 115 is a non-operation timer that counts the operation interval from the user to the input unit. After the first display unit 11 and the second display unit 21 normally display, the timer is reset once and the count is performed. Start. The state determination unit 115 has exceeded a predetermined time when the no-operation time, which is an elapsed time since the operation input from the user is lost, in the first input unit 12 or the second input unit 22 exceeds a predetermined time. A signal indicating this is transmitted to the display control unit 113. The predetermined time can be freely changed by setting from the user.

  FIG. 12 is a flowchart illustrating an example of the operation of the display process (“display process 3”) according to the third embodiment. This process starts when the application is activated.

  When the user inputs an operation to the first input unit 12 or the second input unit 22 and starts the application, first, the display information generation unit 111 first displays the first VGA size or HVGA size 2 in accordance with an application instruction. Display information to be displayed on the display unit 11 and the second display unit 21 is generated (step S71).

  The display control unit 113 normally displays the display information generated by the display information generation unit 111 on the first display unit 11 and the second display unit 21 (step S72). The state determination unit 115 resets the no-operation timer that measures the no-operation time (step S73), and starts measuring the no-operation time (step S74). And the state discrimination | determination part 115 determines whether there existed the operation input from a user (step S75).

  When there is no operation input from the user (step S75; NO), the state determination unit 115 determines whether or not the no-operation time is equal to or greater than a predetermined value (step S76). If the no-operation time is not equal to or greater than the predetermined value (step S76; NO), the process returns to step S75, and steps S75 and S76 are repeated. If the no-operation time is greater than or equal to a predetermined value (step S76; YES), the state determination unit 115 notifies the display control unit 113 to that effect. In this case, the display control unit 113 displays the last display screen in the memory together with the first display unit 11 and the second display unit 21 (step S77), returns to step S73, and repeats steps S73 to S77.

  Thereafter, until the memory display mode ends, the display content update of the application and the transfer of the display information from the display information generation unit 111 are stopped, and the display control unit 113 also stops the update of the display memory unit 60. Then, the process returns to the reset of the no-operation timer and the start of measurement of the no-operation time, and the process returns to the monitoring of the operation input from the user.

  When there is an operation input from the user (step S75; YES), the state determination unit 115 determines whether or not the application is ended (step S78), and when the application is not ended (step S78: NO). Returning to step S71, steps S71 to S78 are repeated. When the application is terminated (step S78: YES), the process is terminated.

  As described above, by applying the present invention as in the above-described embodiment, when the user's no-operation time is long, the display unit that is normally displayed is also switched to the memory display, so that the user-friendliness and low power consumption are achieved. Can provide a display device that achieves both operations.

(Embodiment 4)
FIG. 13 is a block diagram illustrating a configuration example of the mobile communication terminal 1 according to the fourth embodiment. The mobile communication terminal 1 according to Embodiment 4 has a configuration in which a style detection unit 80 is added to the mobile communication terminal 1 of each of the above embodiments.

  The style detector 80 detects the orientation of the mobile communication terminal 1 and transmits the style type (landscape style / vertical style) to the controller 100. In the present embodiment, the style detection unit 80 is a triaxial acceleration sensor that can detect the inclination in the XYZ directions mounted on the substrate on the second housing 20 side.

  The functions realized by the control unit 100 according to the present embodiment are the same as those in the third embodiment described above. That is, the function as shown in FIG.

  FIG. 14 shows examples of styles that the mobile communication terminal 1 according to the fourth embodiment can take. The mobile communication terminal 1 includes, for example, a horizontal style in which the first display unit 11 and the second display unit 21 are horizontally oriented as shown in FIG. 14A, and a first style as shown in FIG. 14B. The first display unit 11 and the second display unit 21 have two portrait styles, which are vertically oriented, and each style further has a normal rotation style and an inverted style rotated by 180 °.

  The detection of the style is determined by the state determination unit 115 based on the following information obtained by the style detection unit 80. Here, from the detection information of the triaxial acceleration sensor of the style detection unit 80, the ratio (= tilt) of acceleration with respect to the vertical direction in the X axis direction and the Y axis direction on the second housing 20 side can be detected. The absolute values of the acceleration values for the respective axes are compared. When the inclination angle in the Y-axis direction is large, the horizontal style is used. When the inclination angle in the X-axis direction is large, the vertical style is selected.

  Furthermore, when the inclination angle in the Y-axis direction in the landscape orientation is 0 ° or more (acceleration value is negative), it is a normal rotation style, and when it is less than 0 ° (acceleration value is positive), it is an inversion style. When the tilt angle in the X-axis direction is 0 ° or more (acceleration value is negative), the rotation style is normal, and when it is less than 0 ° (acceleration value is positive), the rotation style is reversed.

  FIG. 15 is a diagram for explaining the passage of time in each style of the display device according to the fourth embodiment. FIG. 15A shows the passage of time of the mobile communication terminal 1 in the landscape style. In the case of the landscape style, for example, when a mail application is started and a mail is created, the mobile communication terminal 1 displays the application screen in the normal display mode when viewed from the user in the normal display mode, and the lower display section. Displays the keyboard screen in memory display mode.

  If the first display unit 11 and the second display unit 21 display independent applications before the landscape orientation, the application displayed on the display unit on the upper side when shifting to the landscape style Priority is given, the application displayed on the lower display unit is terminated, and the keyboard screen is displayed. That is, the display control unit 113 switches the display information displayed by the current application to the display information of the horizontal tone suitable for the horizontal style according to the instruction of the application, and continues to display in the normal display mode on the upper display unit.

  The lower display unit and the upper display unit in the mobile communication terminal 1 are as follows. When the state determination unit 115 determines that the forward rotation is in the landscape style, the second display unit 21 is a lower display unit as viewed from the user, and the first display unit 11 is an upper display unit.

  On the other hand, when the state determination unit 115 determines that the horizontal style is reversed, the first display unit 11 is a lower display unit as viewed from the user, and the second display unit 21 is an upper display unit. . The state determination unit 115 also continuously detects whether there is an operation on the first input unit 12 or the second input unit 22 from the user, there is no operation input from the user, and the time of the no-operation timer is a predetermined no-operation. When the time elapses, the state determination unit 115 notifies the display control unit 113 to that effect. In this case, the display control unit 113 switches the upper display unit to the memory display.

  FIG. 15B shows the passage of time of the mobile communication terminal 1 in the vertical orientation style. In the case of the portrait orientation, for example, when an Internet application is started and a web page is browsed, the display control unit 113 displays the web page display information as vertical basis display information suitable for the portrait orientation according to an instruction from the application. The display information is continuously displayed on the left and right display units in the normal display mode.

  The state determination unit 115 also continues to detect whether there is an operation on the first input unit 12 or the second input unit 22 from the user, there is no operation input from the user, and the time of the non-operation timer is set to a predetermined non-operation time. When the operation time elapses, the application defines the left side as viewed from the user as the main screen and the right side as the sub screen, and displays the application.

  Here, when the first display unit 11 and the second display unit 21 display independent applications before the portrait orientation, the left side when viewed from the user when the transition to the portrait style is performed. The application displayed on the display unit that becomes the main screen is given priority, and the application displayed on the right display unit saves the state and temporarily terminates. At this time, the display information of the application on the main screen is displayed on the left and right display units in the normal display mode. When shifting to the vertical style, the application may be displayed by defining the left side from the beginning as the main screen and the right side as the sub screen.

  Also, when the application is displayed by defining the left side as the main screen and the right side as the sub screen, if there is an application instruction on the main screen, the instruction content is displayed as a sub screen and the application instruction on the main screen is displayed. If there is no, display that does not require frequent screen updates, such as wallpaper or calendar. This display follows the display designation set in advance by the user as the standby screen setting.

  For example, the arrangement of the main screen and the sub screen in the mobile communication terminal 1 is as follows. In the case of normal rotation in the vertical style, the first display unit 11 is the left side when viewed from the user, and the second display unit 21 is the right side and the sub screen. On the other hand, in the case of reversing the vertical style, the second display unit 21 is on the left side when viewed from the user, and the main screen is displayed on the left side, and the first display unit 11 is on the right side and is the sub screen.

  After displaying the application by defining the left side as the main screen and the right side as the sub screen, the state determination unit 115 further determines whether there is an operation on the first input unit 12 or the second input unit 22 from the user. If the operation continues to be detected and there is no operation input from the user and the time of the no-operation timer has passed a predetermined no-operation time, the state determination unit 115 notifies the display control unit 113 to that effect. In this case, the display control unit 113 switches the left display unit (main screen) to the memory display.

  Although the left and upper sides are the main screen and the right and lower sides are the sub screens, they may be reversed.

  FIG. 16 shows an example when a so-called book viewer application for displaying an electronic book is activated in the mobile communication terminal 1 according to the fourth embodiment. When the book viewer application is activated, the state determination unit 115 detects the style of the mobile communication terminal 1 based on the detection signal from the style detection unit 80. Here, in the case of the normal rotation in the horizontal style as shown in FIG. 16A, the first display unit 11 is defined as the main screen, and the second display unit 21 is defined as the sub screen.

  In the case of reversing the landscape style, the second display unit 21 is defined as the main screen, and the first display unit 11 is defined as the sub screen. Further, as shown in FIG. 16B, in the case of the normal rotation in the vertical style, the first display unit 11 is the left side when viewed from the user, and the second display unit 21 is the right side and is defined as the sub screen.

  In the case of reversing the vertical style, the second display unit 21 is defined as the main screen and the first display unit 11 is defined as the sub-screen as the left side when viewed from the user. The display information generation unit 111 transmits, as display information, book content indicating the contents of the electronic book to be played back by the book viewer application to the display control unit 113.

  The display control unit 113 determines a display image division and rearrangement method based on the size and orientation of the book content image received from the display information generation unit 111, performs the division and rearrangement of the display image, and the display memory unit 60. Expand to. The display control unit 113 performs text display in the book content in the normal display mode on the main display unit, and performs display in the memory display mode in which the table of contents in the book content is fixed on the sub display unit.

  FIG. 17 shows an example when a so-called photo viewer application for displaying a photographic image is started in the mobile communication terminal 1 according to the fourth embodiment. FIG. 17A shows an example in the case of normal rotation in the landscape style. FIG. 17B is an example in the case of normal rotation in the vertical style. In the slide show display of the photo viewer application, separate photographic images are displayed on the two display units.

  At that time, the state determination unit 115 detects the style of the mobile communication terminal 1 based on the detection signal from the style detection 80. The display control unit 113 performs enlargement / reduction so as to fit the direction and size of each display unit, and displays the photographic image. The first display unit 11 and the second display unit 21 perform memory display, and the display information is transferred from the display information generation unit 111 only once for the first time when a new photographic image is displayed. Thereafter, each time a slide show switching time of a preset unit time elapses, information is updated for each screen. That is, when a predetermined time has elapsed, a photographic image as the next display information is overwritten and displayed in the memory in the pixel for each display screen.

  FIG. 18 is a flowchart illustrating an example of the operation of the display process (“display process 4”) according to the fourth embodiment. This process starts when the application is activated.

  When the user inputs an operation to the first input unit 12 or the second input unit 22 and starts the application, first, the display information generation unit 111 first displays the first VGA size or the first HVGA size according to an instruction from the application. Display information to be displayed on the display unit 11 and the second display unit 21 is generated (step S81).

  The display control unit 113 normally displays the display information generated by the display information generation unit 111 on the first display unit 11 and the second display unit 21 (step S82). The state determination unit 115 resets the no-operation timer that measures the no-operation time (step S83), and starts measuring the no-operation time (step S84). Then, the state determination unit 115 determines the style type from the direction of the mobile communication terminal 1 based on the detection signal from the style detection unit 80. (Step S85).

  When the style determined by the state determination unit 115 is the landscape style (step S86; YES), the state determination unit 115 notifies the display control unit 113 to that effect. In this case, the display control unit 113 switches the display information of the application to the display information of the horizontal tone suitable for the horizontal style, and the upper display unit displays the display information of the horizontal style in the normal display mode (step S87). ).

  When there is no operation input from the user (step S88; NO), the state determination unit 115 determines whether or not the no-operation time is equal to or greater than a predetermined value X (step S89). If the no-operation time is not equal to or greater than the predetermined value X (step S89; NO), the process returns to step S88, and steps S88 and S89 are repeated. On the other hand, when the no-operation time is greater than or equal to the predetermined value X (step S89; YES), the state determination unit 115 notifies the display control unit 113 accordingly. In this case, the display control unit 113 displays the last display screen in the memory on the upper display unit (step S90), returns to step S88, and repeats steps S88 to S90.

  On the other hand, when there is an operation input from the user (step S88; YES), the state determination unit 115 determines whether or not the application is ended (step S91), and when the application is not ended (step S91: NO), it returns to step S81 and repeats step S81-step S91. If the application is terminated (step S91: YES), the process is terminated.

  When the style determined by the state determination unit 115 is the portrait style (step S86; NO), the state determination unit 115 notifies the display control unit 113 to that effect. In this case, the display control unit 113 switches the display information of the application to the display information of the vertical tone suitable for the vertical style, and the left and right display units display the display information of the vertical style in the normal display mode ( Step S92).

  When there is an operation input from the user (step S93; YES), the state determination unit 115 determines whether or not the application is ended (step S99), and when the application is not ended (step S99: NO), it returns to step S81 and repeats step S81-step S99. When the application is terminated (step S99: YES), the process is terminated.

  On the other hand, when there is no operation input from the user (step S93; NO), the state determination unit 115 determines whether or not the no-operation time is equal to or greater than a predetermined value Y (step S94). If the no-operation time is not equal to or greater than the predetermined value Y (step S94; NO), the process returns to step S93, and steps S93 and S94 are repeated.

  If the no-operation time is greater than or equal to the predetermined value Y (step S94; YES), the state determination unit 115 notifies the display control unit 113 accordingly. In this case, the display control unit 113 displays the application by defining the left side as viewed from the user as the main screen and the right side as the sub screen (step S95).

  Furthermore, when there is no operation input from a user (step S96; NO), the state determination part 115 determines whether a no-operation time is more than predetermined value X (step S97). If the no-operation time is not equal to or greater than the predetermined value X (step S97; NO), the process returns to step S96, and steps S96 and S97 are repeated.

  If the no-operation time is greater than or equal to the predetermined value X (step S97; YES), the state determination unit 115 notifies the display control unit 113 of that fact. In this case, the display control unit 113 displays the last display screen (main screen) in memory on the left display unit as viewed from the user (step S98), returns to step S96, and repeats steps S96 to S98.

  On the other hand, when there is an operation input from the user (step S96; YES), the state determination unit 115 determines whether or not the application is ended (step S99), and when the application is not ended (step S99: NO), it returns to step S81 and repeats step S81-step S99. When the application is terminated (step S99: YES), the process is terminated.

  As described above, by applying the present invention as in the above embodiment, the user can display a necessary application and switch to the memory display mode by a simple method of style change operation. Furthermore, by adding the detected style type and no-operation time to the switching determination to the memory display mode, it is possible to control the low power consumption display with higher accuracy without impairing the visibility of the user.

  When the book viewer application is activated in the mobile communication terminal 1, the main display unit displays text in the book content in the normal display mode, and the sub display unit operates in the memory display mode in which the table of contents in the book content is fixed. By performing the display, the text of the display unit that performs normal display can be freely scrolled, and the display unit that performs memory display can display the entire content with low power consumption. You can read content comfortably.

  When the photo viewer application is started on the mobile communication terminal 1, in the slide show display, separate photo images are displayed in memory on the two display units, and each time one slide show switching time is displayed, a new photo image is displayed. By updating, it is possible to reduce the number of times the screen is updated during the slide show, in addition to reducing the power consumption by the memory display.

(Embodiment 5)
FIG. 19 is a diagram illustrating an example of an external configuration of the mobile communication terminal 1 according to the fifth embodiment. As shown in the figure, the mobile communication terminal 1 according to the present embodiment includes a third display unit 31 and a third input unit 32 in the first housing 10 in addition to the configuration of the first embodiment shown in FIG. A fourth display unit 41 and a fourth input unit 42 are configured in the second housing 20.

  The internal configuration of such a mobile communication terminal 1 will be described with reference to FIG. FIG. 20 is a block diagram illustrating an internal configuration example of the mobile communication terminal 1 according to the fifth embodiment of the present invention. As illustrated, the mobile communication terminal 1 according to the fifth embodiment includes a third display unit 31, a third input unit 32, a third backlight 33, a fourth display in addition to the configuration of the first embodiment illustrated in FIG. The display unit 41, the fourth input unit 42, and the fourth backlight 43 are provided.

  That is, the mobile communication terminal 1 according to the fifth embodiment has a configuration including four display units, four input units, and four backlights each provided in the mobile communication terminal 1 of the first embodiment. Each of these four display units is a QVGA (Quarter VGA) size transflective liquid crystal, and each pixel has a RGB memory of 1 bit, and is refreshed from the control unit 100. It is possible to switch between displaying display information and performing 8-color display from the memory in each pixel without refresh transfer from the control unit 100.

  In this case, the function realized by the control unit 100 is the same as the functional configuration in the first embodiment illustrated in FIG. 3, but the display information generation unit 111 includes the first input unit 12, the second input unit 22, Display information is generated based on inputs from the 3 input unit 32 and the fourth input unit 42. The display control unit 113 includes the first display unit 11, the second display unit 21, the third display unit 31, and the fourth display unit. The display control of the display unit 41 is performed, and the backlight control unit 114 controls the first backlight 13, the second backlight 23, the third backlight 33, and the fourth backlight 43.

  Here, FIG. 21 shows styles that the mobile communication terminal 1 according to the present embodiment can take. In the mobile communication terminal 1 according to the present embodiment, as shown in FIG. 21A, the first display unit 11, the second display unit 21, the third display unit 31, and the fourth display unit 41 are in the landscape orientation. 2 and the vertical style in which the first display unit 11, the second display unit 21, the third display unit 31, and the fourth display unit 41 are in the portrait orientation as shown in FIG. Each style has a normal rotation style and an inverted style rotated by 180 °.

  FIG. 22 is a diagram illustrating a relationship among display information, a division method, and a display image according to the fifth embodiment. When the first display unit 11, the second display unit 21, the third display unit 31, and the fourth display unit 41 display in the normal mode, the display control unit 113 starts from the display information generation unit 111 as shown in FIG. Based on the size and orientation of the received display information image, a method for dividing and rearranging the display image is determined, the display image is divided and rearranged, and developed in the display memory unit 60. Here, it is assumed that the display content update of the application and the display information update by the display information generation unit 111 are performed at, for example, 30 Hz, and the display control unit 113 receives the display information from the display information generation unit 111. The display memory unit 60 is updated by dividing the display image and rearranging the data.

  The display control unit 113 displays display information to be displayed on the first display unit 11, the second display unit 21, the third display unit 31, and the fourth display unit 41 developed in the display memory unit 60 to each display unit. For example, refresh transfer is performed at RGB888 · 60 Hz. The first display unit 11 and the second display unit 21 display the display information refreshed and transferred.

  For example, when the display information generation unit 111 generates a horizontally long VGA image having a size of W640 × H480 as display information, the division method is “vertical and horizontal division”. The display image displayed on the first display unit 11 is the upper right QVGA image (size: W320 × H240) of the original image, and the display image displayed on the second display unit 21 is the lower right QVGA image (size) of the original image. : W320 × H240), the display image displayed on the third display unit 31 is the QVGA image (size: W320 × H240) at the upper left of the original image, and the display image displayed on the fourth display unit 41 is the original image. The lower left QVGA image (size: W320 × H240) is obtained.

  When displaying on each display unit in the normal display mode, the display control unit 113 converts the information created by the display information generation unit 111 into display image segmentation based on the size and orientation of the image, as shown in FIG. The data rearrangement method is determined, divided and rearranged, and developed in the display memory unit 60. Thereafter, the update of the display contents of the application and the update of the display information from the display information generation unit 111 are performed at 30 Hz, and each time the display control unit 113 divides the display image and rearranges the data, the display memory unit 60 Update. Then, the display information on each display unit of the display memory unit 60 is refresh-transferred to each display unit at RGB888 / 60 Hz. Each display unit displays the contents of the refreshed data.

  When displaying on each display unit in the memory display mode, the display control unit 113 divides the display image from the size and orientation of the display information received from the display information generation unit 111 as shown in FIG. The data rearrangement method is determined, divided and rearranged, and developed in the display memory unit 60. At this time, the display control unit 113 leaves only the most significant bit of the RGB 8-bit data of display information to be displayed on each display unit, and develops it in the display memory unit 60 as RGB 111 (= 8 color display) data. To do. At this time, processing for smoothing edges by dither processing or the like may be added.

  Further, the RGB 111 image on each display unit is transferred to the second display unit 21 and the fourth display unit 41 only once. At that time, each display unit displays the contents of the refreshed data, and each display unit stores the obtained display information in the memory in the pixel, and switches to the memory display from the memory in the pixel.

  The display operation according to the present embodiment will be described with reference to the flowchart shown in FIG. FIG. 23 is a flowchart illustrating an example of the operation of the display process (“display process 5”) according to the fifth embodiment. This process starts when the application is activated.

  When the user inputs an operation to the first input unit 12, the second input unit 22, the third input unit 32, or the fourth input unit 42 and starts an application, first, the display information generation unit 111 first displays the VGA according to an instruction from the application. Display information to be displayed on the first display unit 11, the second display unit 21, the third display unit 31, and the fourth display unit 41 of one size screen, two HVGA sizes, or four QVGA sizes is generated ( Step S101).

  Then, the display mode determination unit 112 sequentially executes determination display processing for the first display unit 11, determination display processing for the second display unit 21, determination display processing for the third display unit 31, and determination display processing for the fourth display unit 41. (Steps S102 to S105). Details of these determination display processes will be described later.

  Next, the backlight control unit 114 performs a backlight drive determination process for calculating the value of the backlight drive current (step S106). The backlight control unit 114 switches the first backlight 13, the second backlight 23, the third backlight 33, and the fourth backlight 43 with the drive current having the value acquired by the display generation unit 11 as a result of the backlight drive determination process. It lights up simultaneously (step S107). The backlight drive determination process here is the same as the case where the “backlight drive determination process 2” of the second embodiment shown in FIG. 10 is applied to four backlights.

  If the application has not ended (step S108: NO), the process returns to step S101, and steps S101 to S108 are repeated. When the application is terminated (step S108: YES), the process is terminated.

  Details of the “determination display process” executed in the “display process 5” described above will be described with reference to the flowchart shown in FIG. FIG. 24 is a flowchart illustrating an example of operation of determination display processing according to the fifth embodiment. The determination display process in FIG. 24 is a process defined in step S102, step S103, step S104, and step 105 in “display process 5” shown in FIG.

  When the process is started, first, the display mode determination unit 112 determines whether or not a display mode is designated on the display unit from the application (step S111).

  When the display mode of the display unit is specified from the application (step S111; NO), the display mode determination unit 112 determines whether the specification from the application is the normal display mode (step S115). When the designation from the application is the normal display mode (step S115; YES), the display mode determination unit 112 notifies the display control unit 113 to that effect. In this case, the display control unit 113 normally displays the display information generated by the display information generation unit 111 on the display unit (step S116), and ends the process.

  If the designation from the application is not the normal display mode (step S115; NO), the display mode determination unit 112 notifies the display control unit 113 of that fact. In this case, the display control unit 113 displays the memory on the display unit (step S114) and ends the process.

  On the other hand, when there is no designation of the display mode of the display unit from the application (step S111; YES), the display mode determination unit 112 performs display mode determination processing and determines the display mode of the display unit (step S112). . When the display mode of the display unit determined by the display mode determination unit 112 is the memory display mode (step S113; YES), the display control unit 113 displays the memory on the display unit (step S114) and performs processing. finish.

  When the display mode of the display unit determined by the display mode determination unit 112 is not the memory display mode (step S113; NO), the display control unit 113 displays the display information generated by the display information generation unit 111 on the display unit. Is normally displayed (step S116), and the process is terminated.

  Note that the “display mode determination process” defined in step S112 of the “determination display process” illustrated in FIG. 24 is the same as the “display mode determination process 1” of the first embodiment illustrated in FIG.

  As described above, by applying the present invention as in the above-described embodiment, the visibility and display image quality viewed from the user are impaired in the display device having the display unit capable of both the four normal displays and the memory display. Therefore, it is possible to display with low power.

  Further, by controlling the brightness of the backlight with reference to the above-described backlight drive current table, the first display unit 11, the second display unit 21, the third display unit 31, and the fourth display unit 41 are interlocked. Alternatively, when one image is displayed on a plurality of display units, only a part of the backlights of the four display units is dimmed, and deterioration of visibility in a state where the plurality of display units are combined can be prevented. . In addition, when all four display units are in memory display mode, the display brightness is prioritized for low power consumption, and the display brightness of the four display units varies, reducing the visibility without deteriorating the visibility. It can be displayed with power.

(Embodiment 6)
A style detector 80 as exemplified in the fourth embodiment may be added to the configuration of the sixth embodiment, and the configuration shown in FIG.

  In this case, as in the fourth embodiment, the state determination unit 115 realized by the control unit 100 functions as a non-operation timer that counts the operation interval from the user to the input unit, and is input from the style detection unit 80. The style of the mobile communication terminal 1 is determined based on the detected signal.

  FIG. 26 shows an example when a character input application is activated in the mobile communication terminal 1 according to the sixth embodiment. When the character input application is activated, the state determination unit 115 determines the style of the mobile communication terminal 1 based on the detection signal from the style detection unit 80.

  FIG. 26A shows an example of a display screen in the case of the landscape style. In the case of normal rotation in the landscape style, the lower display unit 2 faces the fourth display unit 41 and the second display unit 21, the fourth display unit 41 is the keyboard left screen, and the second display unit 21 is the keyboard right screen. Is displayed in memory. The upper display unit 2 has the third display unit 31 and the first display unit 11 and normally displays display information of the character input application.

  Further, the display direction of the landscape style (forward rotation) screen is displayed with the short side of each display unit facing up. In the case of reversing the landscape orientation, the lower display unit 2 faces the first display unit 11 and the third display unit 31, the first display unit 11 displays the keyboard left screen, and the third display unit 31 displays the keyboard right screen. Display memory. The upper display unit 2 has the second display unit 21 and the fourth display unit 41, and normally displays the display information of the character input application. In addition, the display direction of the screen in the horizontal style (inverted) is displayed in the direction in which the short side of each display unit is on the top (inverted vertically).

  FIG. 26B shows an example of a display screen in the case of the portrait style. In the case of the normal rotation in the vertical style, the lower display unit 2 surface is the third display unit 31 and the fourth display unit 41, the third display unit 31 is the keyboard left screen, and the fourth display unit 41 is the keyboard right side. Display the screen in memory. The upper display unit 2 has the first display unit 11 and the second display unit 21 and normally displays the display information of the character input application.

  Further, the display direction of the screen in the portrait orientation (forward rotation) is displayed in the orientation in which the long side of each display unit is on the top. In the case of reversal of the vertical style, the lower display unit 2 faces the second display unit 21 and the first display unit 11, the second display unit 21 is the keyboard left screen, and the first display unit 11 is the keyboard right screen. Is displayed in memory. The upper display unit 2 has a fourth display unit 41 and a third display unit 31 and normally displays display information of the character input application. Further, the display direction of the screen in the vertical orientation style (inverted) is displayed in an orientation in which the long side of each display unit is on the top (inverted vertically).

  The display operation of the mobile communication terminal 1 according to this embodiment will be described with reference to the flowchart shown in FIG. FIG. 27 is a flowchart illustrating an example of the operation of the display process (“display process 6”) according to the sixth embodiment. This process starts when the application is activated.

  When the user inputs an operation to the first input unit 12, the second input unit 22, the third input unit 32, or the fourth input unit 42 and starts an application, first, the display information generation unit 111 first displays the VGA according to an instruction from the application. Display information to be displayed on the first display unit 11, the second display unit 21, the third display unit 31, and the fourth display unit 41 of one size screen, two HVGA sizes, or four QVGA sizes is generated ( Step S121).

  The display control unit 113 normally displays the display information generated by the display information generation unit 111 on the first display unit 11, the second display unit 21, the third display unit 31, and the fourth display unit 41 (step S122). The state determination unit 115 resets the no-operation timer that measures the no-operation time (step S123), and starts measuring the no-operation time (step S124). Further, based on the detection signal from the style detection unit 80, the state determination unit 115 determines the style type from the orientation of the mobile communication terminal 1. (Step S125).

  In the case of the landscape style (step S126; YES), the display control unit 113 switches the display information of the application to the display information of the horizontal tone corresponding to the landscape style, and the display unit on the upper two screens inputs characters in the landscape style. The display information of the application is normally displayed, and the display units on the lower two surfaces display the keyboard screen in the horizontal style in memory (step S127).

  When it is the portrait orientation (step S126; NO), the display control unit 113 switches the display information of the application to the display information of the horizontal keynote that matches the portrait orientation, and the display unit on the upper two screens is the portrait orientation style. The display information of the character input application is normally displayed, and the display units on the lower two sides display the keyboard screen in the portrait orientation in memory (step S128).

  Next, the state determination unit 115 determines whether or not there is an operation input from the user (step S129). When there is no operation input from the user (step S129; NO), the state determination unit 115 determines whether or not the no-operation time is a predetermined value or more (step S130). If the no-operation time is not equal to or greater than the predetermined value (step S130; NO), the process returns to step S129, and steps S129 and S130 are repeated.

  If the no-operation time is greater than or equal to a predetermined value (step S130; YES), the display control unit 113 displays the last display screen in memory on the upper two display units (step S131). In this case, the process returns to step S129, and steps S129 to S131 are repeated.

  On the other hand, if there is an operation input from the user (step S129; YES), it is determined whether or not the application has ended (step S132). If the application has not ended (step S132: NO), the process proceeds to step S121. Return and repeat step S121 to step S132. When the application is terminated (step S132: YES), the process is terminated.

  As described above, by applying the present invention as in the above embodiment, a display device having a display unit capable of both of four normal displays and a memory display, and in any style, a keyboard is always in front of the user. Can be displayed in memory, and when the user's non-operation time is long, the display unit that has been normally displayed can be switched to the memory display, thereby providing a display device that achieves both user convenience and operation with low power consumption.

  The said embodiment is an example and the application range of this invention is not restricted to this. That is, various applications are possible, and all embodiments are included in the scope of the present invention.

  For example, in the above-described embodiment, the case where the display device according to the present invention is applied to a mobile communication terminal is illustrated. However, the display device is not limited to a mobile communication terminal as long as it has display means capable of memory display. The present invention can be applied to other electronic devices.

  Further, by applying the program to an existing electronic device as well as an electronic device provided with the configuration according to the present invention in advance, the electronic device according to the present invention can be caused to function.

  The application method of such a program is arbitrary. For example, the program can be applied by being stored in a storage medium such as a CD-ROM or a memory card, or can be applied via a communication medium such as the Internet.

DESCRIPTION OF SYMBOLS 1 ... Mobile communication terminal, 10 ... 1st housing | casing, 11 ... 1st display part, 12 ... 1st input part, 13 ... 1st backlight, 20 ... 2nd housing | casing, 21 ... 2nd display part, 22 ... 2nd input part, 23 ... 2nd backlight, 31 ... 3rd display part, 32 ... 3rd input part, 33 ... 3rd backlight, 41 ... 4th display part, 42 ... 4th input part, 43 ... 4th backlight 50 ... Illuminance detection part 60 ... Display memory part 70 ... Memory | storage part 80 ... Style detection part 100 ... Control part 111 ... Display information generation part 112 ... Display mode determination part 113 ... Display Control unit 114 ... Backlight control unit 115 ... State determination unit

Claims (12)

A first housing having one or more display screens;
A second housing movably coupled to the first housing and having one or more display screens,
At least one of the display screens is a display device having a memory display function for displaying information stored in a memory in a pixel,
First acquisition means for acquiring rewrite frequency information indicating the rewrite frequency of each display screen;
Second acquisition means for acquiring display information to be displayed on each display screen;
Normal display means for displaying the display information acquired by the second acquisition means on at least one of the display screens;
Memory display means for displaying display information stored in a memory in a pixel on a display screen having the memory display function;
Determining whether to display the display information acquired by the second acquisition unit or the display information stored in the memory in the pixel based on the rewrite frequency information on the display screen having the memory display function; Display control means for controlling the display based on the determination result,
The display control means further makes the display attribute of each display screen the same based on a condition of display information for displaying on the display screen having the memory display function.
A display device characterized by that. The display screen having the memory display function is a memory liquid crystal in which the number of colors is limited when displaying information stored in a memory in a pixel,
The display control means determines whether or not character information is included in display information to be displayed on the display screen having the memory display function, and when character information is included, based on the character information A first determination means for calculating the number of points indicating the size of the displayed character and determining whether the number of points is smaller than a predetermined value;
When the first determination unit determines that the number of points is smaller than a predetermined value, the second acquisition unit acquires the display screen having the memory display function in the same manner as the display screen not having the memory display function. Display the displayed display information,
The display device according to claim 1. When the display information to be displayed on the display screen having the memory display function includes character information, the display control means stores the display information stored in the memory in the pixel on the display screen having the memory display function. , The text color is black and the background color is white, or the text color is white and the background color is black.
The display device according to claim 2. The first casing and the second casing include a backlight corresponding to each display screen,
Third acquisition means for acquiring illuminance information indicating the illuminance of the surrounding environment of the display device;
Second determination means for determining whether or not each display information to be displayed on the display screen is linked;
A backlight control means for controlling a drive current of the backlight, and
The backlight control means includes
When the second determination unit determines that the display information to be displayed on the display screen is linked, the display screen displaying the linked display information has the same luminance based on the illuminance information. Control the drive current of the backlight so that
When the second determination unit determines that the display information to be displayed on the display screen is not linked, the display screen having the memory display function is a memory in a pixel based on the illuminance information. Controlling the drive current of the backlight so that the display screen for displaying the display information stored in the display has a luminance that provides minimum visibility,
The display device according to claim 1, wherein the display device is a display device. The first acquisition unit compares the display information acquired last time by the second acquisition unit with the display information acquired this time, and whether the display information having the memory display function is the same display information for a predetermined period. Determine
The display control unit determines that the rewrite frequency is low when the first acquisition unit determines that the display information is the same for a predetermined period, and stores the display information having a memory display function in a memory in a pixel. Display the displayed display information,
The display device according to claim 1, wherein the display device is a display device. The first acquisition means measures the no-operation time when there is no operation input from the user on the display screen having the memory display function, and determines whether the no-operation time is longer than a predetermined value,
When the first acquisition unit determines that the no-operation time is longer than a predetermined value, the display control unit determines that the rewriting frequency is low, and displays the second acquisition on the display screen having the memory display function. The display information acquired last by the means is stored in the memory in the pixel and displayed. After that, when there is an operation input from the user, the display information acquired by the second acquisition means is displayed.
The display device according to claim 1, wherein the display device is a display device. All display screens of the first housing and the second housing have the memory display function,
A detecting means for detecting a style indicating the orientation of the display device;
The display control means detects the second display screen on one of the one or two display screens when the detection means detects a horizontal style that opens the first casing and the second casing sideways. Display the display information acquired by the acquisition means, and display the display information with a low rewriting frequency preset in the other one or two display screens in a memory in the pixel;
The display device according to claim 1, wherein the display device is a display device. When the detection unit detects that the detection unit is in a portrait orientation that opens the first housing and the second housing in a portrait orientation, the display control unit displays the one or two display screens on the one or two display screens. Display the display information acquired by the second acquisition means, and display the display information with a low rewrite frequency preset in the other one or two display screens in a memory in the pixel,
The display device according to claim 7. In the case where the display information to be displayed on the display screen acquired by the second acquisition means is a book content that is a book content and its table of contents,
When the detection means detects that the landscape style,
The display control means displays the book content on one of the one or two display screens, and stores and displays the table of contents in a memory in a pixel on the other one or two display screens,
When the detection means detects that the portrait style,
The display control means displays the book content on one of the one or two display screens, and displays the table of contents in a memory in a pixel on the other one or two display screens.
The display device according to claim 7, wherein the display device is a display device. Each of the first casing and the second casing has two display screens,
When the display information acquired by the second acquisition means is display information according to an instruction from a character input application,
The display control means includes two display screens on the upper side when viewed from the user among the four display screens of the first casing and the second casing based on the orientation of the display device detected by the detecting means. Display information according to the instruction of the character input application is displayed on the display screen, and the display information of the keyboard for the user to input characters in advance on the two display screens on the lower side when viewed from the user is stored in the memory in the pixel. Memorize and display
The display device according to claim 7, wherein the display device is a display device. When the display information to be displayed on the display screen having the memory display function acquired by the second acquisition means is a photographic image,
The display control means stores the photographic image acquired by the second acquisition means on the display screen in a memory in a pixel and displays the photographic image as the next display information when a predetermined time elapses. , Overwriting the memory in the pixel for each display screen,
The display device according to claim 1, wherein the display device is a display device. A first casing having one or two display screens; and a second casing movably connected to the first casing and having one or two display screens, and at least one of the display screens One is a computer that controls a display device having a memory display function for displaying information stored in a memory in a pixel.
A function of acquiring rewrite frequency information indicating the rewrite frequency of each display screen;
A function for acquiring display information to be displayed on each display screen;
A function of displaying the acquired display information on each display screen;
A function of displaying display information stored in a memory in a pixel on a display screen having the memory display function;
Based on the rewriting frequency information, it is determined whether to display the acquired display information or display information stored in a memory in a pixel on the display screen having the memory display function, and based on the determination result A function to control the display;
A function of making at least one display attribute of each display screen the same based on a condition of display information for display on the display screen having the memory display function;
A program characterized by realizing.

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