JP2009042683A - Display device, display method, display control program, and storage medium - Google Patents

Abstract

To realize a display device 10 capable of determining an abnormality of an LCD drive circuit 30 even when the display content of an LCD panel 40 cannot be grasped from the LCD control circuit 20 side.
An LCD drive circuit 30 for displaying an image on a display element of an LCD panel 40 and an LCD control circuit 20 for performing control for displaying an image on the LCD drive circuit 30 are provided. The display device 10 includes: an output circuit 34 that outputs an image signal for displaying an image on 40; and a booster circuit 36 that boosts a voltage VDC supplied to the output circuit 34 to an output voltage necessary for outputting the image signal. And a voltage detection circuit 50 for detecting a supply voltage supplied from the booster circuit 36 to the output circuit 34. The LCD control circuit 20 determines whether or not the supply voltage VDC detected by the voltage detection circuit 50 is equal to or higher than the output voltage. Is provided with an initialization circuit 22 for initializing the LCD drive circuit 30.
[Selection] Figure 1

Description

  The present invention relates to a display device that displays an image on a display unit, a display method, a display control program, and a storage medium. More specifically, the present invention relates to a display device, a display method, and a display control program for controlling a terminal that displays an image on a display unit using a driving unit.

  2. Description of the Related Art Conventionally, display devices using a display such as an LCD (Liquid Crystal Display) have been widely used in information processing apparatuses, portable terminals, communication terminals, moving image display apparatuses, and electronic devices that display images such as cameras. The LCD is generally driven by an LSI called a drive circuit or a liquid crystal driver.

  The drive circuit displays on the LCD panel based on image signals output from a central control unit (CPU: Central Processing Unit) that controls the entire apparatus, image display control devices such as graphic boards and video cards, and the like. Driving to display an image on the element is performed.

  However, the drive circuit may malfunction due to high-frequency noise generated by discharge from the human body, or the image data stored in the image memory inside the drive circuit may be destroyed, causing display data to be damaged. There is a problem.

  For such a problem, Patent Document 1 periodically performs an error check of image data stored in the image memory, and requests an external device to retransmit the image data when an error is detected. Image data corruption is corrected by updating the image memory based on the retransmitted image data.

Also, in Patent Document 2, the drive current value of the display unit is measured and compared with the predicted drive current value stored in the storage unit to determine whether or not the display unit is abnormal. Is resetting.
JP 2002-72983 A (published on March 12, 2002) Japanese Patent Laying-Open No. 2005-173143 (released on June 30, 2005)

  However, in the above-described conventional configuration, the image data stored in the image memory, the image actually displayed on the display unit, or the drive current value of the display unit are monitored to be displayed on the display unit. This causes a problem that it is necessary to detect abnormalities in the image.

  Specifically, in the method of comparing image data, it is necessary to read at least the image data from the display device, and the image data is transferred between the CPU or the display control device that outputs an image signal for image display and the drive circuit. When there is no control signal line for reading, the display control circuit cannot detect an abnormality in the image displayed on the display unit, and may transmit a control signal for resetting the display to the drive circuit. The problem of not being able to occur.

  In addition, when detecting an abnormality of the display unit from the drive current of the display unit, it is necessary to install a current detection circuit that detects the drive current of the display unit. In general, the required circuit size of the current detection circuit increases, which causes problems in terms of mounting area and cost.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to determine the abnormality of the driving means even in a configuration in which the display content of the display unit cannot be grasped from the display control device side. It is to realize a display device.

  In order to solve the above problem, the display device of the present invention includes a drive unit that displays an image on the display element of the display unit, and a display control unit that performs control to display an image on the drive unit. In the display device, the driving unit outputs an image signal for displaying an image on the display unit, and a voltage supplied to the output unit is set to an output voltage necessary for outputting the image signal. A display device including a boosting unit that boosts voltage includes a voltage detection unit that detects a supply voltage supplied from the boosting unit to the output unit, and the display control unit is configured to detect a supply voltage detected by the voltage detection unit. It is characterized by comprising initialization means for initializing the drive means based on whether the output voltage is equal to or higher than the output voltage.

  In order to solve the above-described problem, the display method of the present invention includes a boosting unit and an output unit. The driving unit displays an image on the display element of the display unit, and the driving unit displays an image. A display method in a display device comprising display control means for controlling, wherein the driving means boosts a voltage supplied to the output means with respect to the boosting means, and for the output means An output step of outputting an image signal to be displayed on the display unit; a detection step of detecting a supply voltage supplied from the boosting unit to the output unit; and a display control unit of the voltage detection unit. And an initialization step for initializing the driving means based on the result detected by the step.

  According to the above configuration, even in a configuration in which the display content of the display unit cannot be grasped from the display control device side, it is possible to determine the abnormality of the driving unit based on the supply voltage supplied from the boosting unit to the output unit. it can. Thereby, even when a problem occurs in the image display due to an abnormality in the supply voltage, there is an effect that the image display can be normalized by initializing the driving means.

  In the above initialization means, the process for initializing the drive circuit and the setting process for normally starting the drive circuit, for example, the screen size and the like according to the content displayed on the display element are given. A configuration in which a setting such as a display position is performed on the driving unit may be employed.

  In the above display device, the voltage detection unit displays 0 when the detected supply voltage is less than the output voltage, and displays the supply voltage when the supply voltage is equal to or higher than the output voltage. Preferably, the display control means initializes the drive means when the output from the voltage detection means is zero.

  According to the above configuration, the voltage detecting means is configured with a simple configuration by using an element that outputs 0 when a predetermined voltage is not output and outputs a voltage when the voltage is higher than the predetermined voltage. can do. If a specific example is given, an inexpensive voltage detection means can be comprised using a transistor, an operational amplifier, etc., for example.

  In the display device, the voltage detection unit further includes an A / D conversion unit that converts the supply voltage from an analog signal to a digital signal and outputs the converted voltage, and the display control unit outputs an output from the voltage detection unit. When the output voltage is lower than the output voltage, the driving unit may be initialized.

  According to the above configuration, since the output voltage in the previous period can be processed as a digital numerical value, it is possible to perform accurate processing such as providing a reference voltage stepwise to reduce the influence of erroneous detection due to noise. Further, when the voltage detection means can be configured inside the display control means, there is no need to add a new part, and there is an effect that the mounting area of the part and the part cost can be saved.

  In the display device, it is preferable that the display control unit determines whether or not to initialize the driving unit based on a plurality of detection results detected by the voltage detection unit.

  According to the above configuration, since the driving unit is initialized based on a plurality of detection results, there is an effect that a malfunction can be determined more accurately.

  The display control means may initialize the driving means based on an interrupt function triggered by an output from the voltage detection means.

  According to the above configuration, since the initialization is performed by using the interrupt function provided in the display control means, a playback device that can eliminate the abnormality of the drive means without periodically checking the state of the drive means by the display control means. There is an effect that it can be realized.

  The display device may be realized by a computer. In this case, a control program for an information management device for causing the display device to be realized by a computer by causing the computer to operate as each of the means, and recording the program Such computer-readable recording media also fall within the scope of the present invention.

  As described above, the display device according to the present invention is a display device including a driving unit that displays an image on the display element of the display unit, and a display control unit that performs control to display an image on the driving unit. In the display device, the driving unit further includes an output unit that outputs an image signal to be displayed on the display unit, and a boosting unit that boosts a voltage supplied to the output unit. Voltage detection means for detecting the supply voltage supplied to the display, and the display control means includes initialization means for initializing the drive means based on the result detected by the voltage detection means. Even if the display content of the display unit cannot be grasped from the display control device side, it is possible to determine the abnormality of the driving means based on the voltage supplied from the boosting means to the output means. Thereby, even when a malfunction occurs in the image display due to the voltage abnormality, the image display can be normalized by initializing the driving means.

  An embodiment of the present invention will be described below with reference to FIGS. In the present embodiment, a mobile terminal provided with a display unit of an LCD (Liquid Crystal Display) will be described as an example, but the present invention is not limited to this. The display unit may be configured by an organic ELD (Electro Luminescence Display) or other display, or may be used for a notebook PC or a general display device.

  FIG. 1 is a functional block diagram showing a main part of a display device 10 of the present invention. The display device 10 of the present embodiment includes an LCD control circuit (display control means) 20, an LCD drive circuit (drive means) 30, an LCD panel (display unit) 40, and a voltage detection circuit (voltage detection means) 50. . The LCD control circuit 20 further includes an initialization circuit (initialization means) 22, and the LCD drive circuit 30 further includes a control circuit 32, an output circuit (output means) 34, and a booster circuit (boost means) 36.

  The LCD control circuit 20 processes an image displayed on the LCD panel 40 and performs a process of displaying an image on the LCD panel 40 via the LCD drive circuit 30. Further, the LCD control circuit 20 may perform processing for processing an image according to the size of the LCD panel 40 or processing for adding an edge to the display image. The LCD control circuit 20 is not necessarily a circuit necessary for displaying an image on the LCD, but is a component necessary for enhancing the LCD display. The CPU may be configured to perform the same processing as the LCD control circuit 20 and display an image.

  The initialization circuit 22 resets the entire LCD drive circuit 30 based on the output signal Vout from the voltage detection circuit 50, and initializes and restarts the LCD drive circuit 30 that is malfunctioning due to noise or the like. Do. More specifically, when the output voltage from the booster circuit 36 decreases due to noise or the like, a control signal for initializing the entire LCD drive circuit 30 is transmitted.

  The LCD drive circuit 30 generates a signal for controlling the LCD panel 40. Specifically, an image signal instructing what kind of image is displayed on each pixel is output to the liquid crystal elements constituting the LCD panel 40. The LCD drive circuit 30 may be configured in the LCD panel 40 in order to save space.

  The control circuit 32 controls each part of the LCD drive circuit 30, specifically, the output circuit 34, the booster circuit 36, the power supply, and other parts of the drive circuit. The output circuit 34 receives an image display instruction from the LCD control circuit 20 and generates an output signal for displaying an image on the display element of the LCD panel 40.

  The booster circuit 36 outputs the boosted supply voltage VDC to the output circuit 34 based on a control signal from the LCD control circuit 20 and an instruction from the control circuit 32. This supply voltage VDC is used as a reference power source necessary for driving the LCD panel 40 by the output circuit 34. The output circuit 34 generates an output for driving the LCD panel 40 based on the reference power source, and causes the LCD panel 40 to display a screen.

  Normally, the booster circuit 36 operates when the LCD panel 40 displays an image. However, when the portable terminal 90 turns off the display of the LCD panel 40 due to a power saving state or the like, the booster circuit 36 is operated. Is not working.

  Accordingly, when the power supply voltage of the booster circuit 36 is lower than the intended voltage, that is, the voltage is not normally boosted despite the state in which the LCD control circuit 20 tries to display the LCD panel 40, the LCD drive circuit 30 is It may be malfunctioning for some reason. Therefore, if the LCD control circuit 20 can monitor this voltage abnormality, the LCD drive circuit 30 can be returned from the abnormal state.

  In the present embodiment, a voltage detection circuit 50 is provided as means for detecting the output voltage of the booster circuit 36. Here, as the voltage detection circuit 50, a voltage detection element having a function of outputting an input voltage if the input voltage is equal to or higher than the reference voltage and outputting 0 V if the input voltage is equal to or lower than the reference voltage is used. As a specific example, a semiconductor element such as a transistor is used.

  As a result, the output of the booster circuit 36 can be processed as 1 if it is equal to or higher than the reference voltage, and 0 if it is equal to or lower than the reference voltage. The LCD control circuit 20 can determine whether the output of the booster circuit 36 is normal or abnormal. Here, the general-purpose input port is a terminal provided for processing signals for various purposes other than a specific purpose, and indicates a terminal used for digital signal processing for determining whether the input signal is 1 or 0. And

  When the LCD control circuit 20 determines that the output of the booster circuit 36 is abnormal, the LCD control circuit 20 uses the initialization circuit 22 to initialize and reset the LCD drive circuit 30.

  Next, a normal operation and a case where an abnormality has occurred in the drive operation by the LCD drive circuit 30 will be described in order.

  First, a normal driving procedure will be described.

  1a. First, the LCD control circuit 20 initializes and sets the LCD drive circuit 30.

  2a. Next, the LCD drive circuit 30 activates the internal booster circuit 36.

  3a. The booster circuit 36 outputs the boosted supply voltage VDC to the output circuit 34.

  4a. The voltage detection circuit 50 outputs the boosted VDC value to Vout.

  5a. Image data is sent from the LCD control circuit 20 to the LCD drive circuit 30.

  6a. The LCD drive circuit 30 controls the output circuit 34 with the internal control circuit 32, and outputs a voltage for controlling the pixels to the LCD panel 40.

  7a. The LCD panel 40 displays an image according to the output from the LCD drive circuit 30.

  The above is the procedure for displaying an image in a normal state.

  Next, a driving procedure when the LCD driving circuit 30 malfunctions due to noise or the like will be described.

  1b. First, an image is displayed on the LCD panel 40 by a normal procedure.

  2b. Noise is applied in the state 1b.

  3b. The LCD drive circuit 30 malfunctions due to the influence of noise.

  4b. The booster circuit 36 stops the boosting operation.

  5b. The output signal Vout of the voltage detection circuit 50 becomes zero.

  6b. The LCD control circuit 20 confirms that the output of the voltage detection circuit 50 is zero.

  7b. The LCD control circuit 20 performs processing for initializing and resetting the LCD drive circuit 30.

  8b. The processes after 2a in the normal driving procedure are performed.

  9b. A normal image is displayed on the LCD panel 40.

  By the above procedure, the abnormal state of the LCD drive circuit 30 can be initialized and normal display can be resumed.

  Next, the overall configuration of the mobile terminal 90 including the display device 10 of the present embodiment will be described with reference to FIG. FIG. 2 is a functional block diagram showing an outline of each part constituting the main part of the mobile terminal 90 of the present embodiment.

  The portable terminal 90 of this embodiment includes a display device 10, a CPU 52, a power supply circuit 54, a key input unit 56, and a battery 58.

  The display device 10 is used to display the operation result when starting the basic software in the portable terminal 90 and various applications such as a call, communication, mail, and photography. The CPU 52 controls each unit of the mobile terminal 90 and executes basic software and various applications. The power supply circuit 54 supplies power to the CPU 52 and each part constituting the display device 10. The key input unit 56 receives an operation input by the user, inputs it to the CPU 52, and reflects it in the operation results of various applications. The battery 58 supplies power to the power circuit 54.

  In addition, although it was set as the structure which operates the portable terminal 90 using the battery 58 here, it is not restricted to this. A configuration in which an AC adapter is connected to a household power supply or the like and power is supplied to the power supply circuit 54 may be employed. In the case of a portable device that is driven by a battery as in the present application, since the device is small, it is easily affected by noise and is liable to malfunction, so that the effect of returning to a normal state is particularly great.

  Next, with reference to FIG. 3, a description will be given of a basic processing procedure when displaying on the mobile terminal 90 of the present embodiment. FIG. 3 is a flowchart showing the flow of display processing in the mobile terminal 90.

  In S101, the portable terminal 90 is powered on based on a key operation from the key input unit 56 by the user. When the power is turned on, the CPU 52 of the mobile terminal 90 reads basic software for managing the mobile terminal 90 from a memory (not shown) and starts it (S102). In S <b> 103, the CPU 52 performs settings for supplying power to each unit of the mobile terminal 90 based on the basic software of the mobile terminal 90 and supplies power.

  In S104, the CPU 52 performs initialization and setting for the LCD control circuit 20 to which power is supplied. With this setting, the LCD control circuit 20 starts the setting process of the LCD drive circuit 30 (S105). In S <b> 106, the LCD control circuit 20 transmits the image data of the initial display screen in the basic software of the mobile terminal 90 to the LCD drive circuit 30.

  The LCD drive circuit outputs a voltage to the LCD panel 40 via the internal booster circuit 36 and the output circuit 34 in order to display an image of the initial screen on the LCD panel 40. The booster circuit 36 outputs the boosted supply voltage VDC to the output circuit 34. At this time, the voltage detection circuit 50 detects the boosted supply voltage VDC output from the booster circuit 36 to the output circuit 34. The voltage detection circuit 50 outputs an output signal Vout indicating a detection result to the LCD control circuit 20 based on the detected supply voltage VDC.

  Through the above series of procedures, an initial screen of basic software is displayed on the LCD panel 40 (S107). The screen display of other applications is also displayed on the LCD panel 40 through the same procedure.

  Next, with reference to FIG. 4, a procedure of processing for returning the display device 10 from the abnormal state in the mobile terminal 90 of the present embodiment will be described. FIG. 4 is a flowchart showing an outline of the processing procedure for initializing the LCD drive circuit 30.

  First, in S201, the LCD control circuit 20 initializes and sets the LCD drive circuit 30. In S <b> 202, the LCD control circuit 20 displays the image on the LCD panel 40 by sending the image data to the LCD drive circuit 30.

  Next, in S203, the LCD control circuit 20 waits for one second after displaying the image on the LCD panel 40. Thereafter, in S204, the LCD control circuit 20 confirms the output of the voltage detection circuit 50. If the output of the voltage detection circuit 50 is 1 (YES in S204), the process proceeds to S205. If the output of the voltage detection circuit 50 is not 1 (NO in S204), the process proceeds to S207.

  In S205, the LCD control circuit 20 waits for 10 seconds. Thereafter, in S206, it is confirmed whether or not the power saving mode is ON. This is because it is not necessary to turn off the LCD display when the power saving mode is ON. If the power saving mode is ON (YES in S206), the process proceeds to S210 and ends in order to initialize and reset the LCD drive circuit 30 when the LCD display is turned ON again. If the power saving mode is not ON (NO in S206), the process returns to S204 to monitor the output of the voltage detection circuit 50 again in order to continue the LCD display.

  In S207, the LCD control circuit 20 waits for 100 milliseconds. Thereafter, the process proceeds to S208, and the output of the voltage detection circuit 50 is confirmed again. In S208, if the output signal Vout of the voltage detection circuit 50 is not 0 (NO in S208), it is assumed that the previous value is incorrect due to the influence of noise or the like, and the process returns to S204. If the output signal Vout of the voltage detection circuit 50 is 0 (YES in S208), the LCD control circuit 20 determines that the LCD drive circuit 30 is malfunctioning, and initializes and resets the LCD drive circuit 30 in S209. Processing is performed to restore the LCD drive circuit 30 from malfunction.

  In the above example, the voltage detection circuit 50 as described above is used as the voltage detection means. For example, the LCD control circuit 20 supplies a power supply voltage such as an ADC (Analog Digital Converter: A / D converter). In the case of having a function of converting to a digital signal, it is possible to determine whether or not the power supply voltage is equal to or higher than a reference in the LCD control circuit 20 using the function. In this case, it is determined that the LCD drive circuit 30 is operating normally if it is equal to or higher than the reference voltage, and it is determined that the LCD drive circuit 30 is operating abnormally if it is equal to or lower than the reference voltage. It may be determined.

  In addition, by connecting the output of the voltage detection circuit 50 to the interrupt terminal of the LCD control circuit 20, the output of the voltage detection circuit 50 can be performed without checking the output of the voltage detection circuit 50 once every few seconds. When the value is 0, the LCD drive circuit 30 may be automatically initialized and reset.

  As described above, the display device 10 according to the present embodiment includes the LCD drive circuit 30 that displays an image on the display element of the LCD panel 40, and the LCD control circuit 20 that performs control to display an image on the LCD drive circuit 30. The LCD drive circuit 30 outputs an image signal for displaying an image on the LCD panel 40 and a voltage VDC supplied to the output circuit 34 for outputting the image signal. The display device 10 including the booster circuit 36 that boosts the output voltage required for the display includes a voltage detection circuit 50 that detects a supply voltage supplied from the booster circuit 36 to the output circuit 34. The LCD control circuit 20 includes a voltage detection circuit. An initialization circuit 22 that initializes the LCD drive circuit 30 based on whether or not the supply voltage VDC detected by the circuit 50 is equal to or higher than the output voltage. Eteiru.

  In addition, the display method of the present embodiment includes a booster circuit 36 and an output circuit 34, a drive circuit 30 that displays an image on a display element of the LCD panel 40, and an LCD that controls the drive circuit 30 to display an image. In the display method in the display device 10 including the control circuit 20, the LCD driving circuit 30 boosts the voltage supplied to the output means 34 to the booster circuit 36, and the output circuit 34 An output step for outputting an image signal to be displayed on the panel 40, a detection step for the voltage detection circuit 50 to detect the supply voltage VDC supplied from the booster circuit 36 to the output circuit 34, and an initialization circuit 22 for the LCD control circuit 20 Includes an initialization step for initializing the LCD drive circuit 30 based on the result detected by the voltage detection circuit 50.

  According to the above configuration, even if the display content of the LCD panel 40 cannot be grasped from the LCD control circuit 20 side, the LCD drive circuit 30 is based on the supply voltage VDC supplied from the booster circuit 36 to the output circuit 34. Can be judged. Thereby, even when a failure occurs in the image display due to the abnormality of the supply voltage VDC, the image display can be normalized by initializing the LCD drive circuit 30.

  In the display device 10 of the present embodiment, the voltage detection circuit 50 displays 0 when the detected supply voltage VDC is less than the output voltage, and displays the supply voltage when the supply voltage VDC is equal to or higher than the output voltage. When the output from the voltage detection circuit 50 is 0, the LCD control circuit 20 initializes the LCD drive circuit 30.

  According to the above configuration, by using an element using a semiconductor such as a transistor that outputs 0 when a predetermined voltage is not output and outputs a voltage when the voltage is higher than the predetermined voltage, The voltage detection means can be configured with a simple configuration.

  The voltage detection circuit 50 outputs 0 to the LCD control circuit 20 when the detected supply voltage VDC is less than the output voltage, and 1 as Vout when the supply voltage VDC is greater than or equal to the output voltage. The control circuit 20 may be configured to initialize the LCD drive circuit 30 when the output Vout from the voltage detection circuit 50 is zero.

  According to the above configuration, the voltage detection circuit 50 can be configured using an element that outputs a value of 1 or 0 according to the voltage, and therefore a function of making a determination based on the value input to the LCD control circuit 20 is added. The display device can be configured with a simple configuration without necessity.

  Further, the LCD control circuit 20 determines whether or not to initialize the driving unit based on a plurality of detection results detected by the voltage detecting unit.

  According to the above configuration, the LCD drive circuit 30 is initialized based on a plurality of detection results, so that a malfunction can be determined more accurately.

  The LCD control circuit 20 initializes the LCD drive circuit 30 based on an interrupt function triggered by the output signal Vout from the voltage detection circuit 50.

  According to the above configuration, since the initialization is performed using the interrupt function provided in the LCD control circuit 20, it is not necessary to periodically check the state of the drive means by the LCD control circuit 20, and reproduction that can eliminate the abnormality of the drive circuit There is an effect that the apparatus can be realized.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

  Finally, each block of the display device 10, in particular, the LCD control circuit 20 and the initialization circuit 22 may be configured by hardware logic, or may be realized by software using a CPU as follows.

  That is, the display device 10 includes a CPU (Central Processing Unit) that executes instructions of a control program that realizes each function, a ROM (Read Only Memory) that stores the program, a RAM (Random Access Memory) that expands the program, A storage device (recording medium) such as a memory for storing the program and various data is provided. An object of the present invention is to provide a recording medium in which a program code (execution format program, intermediate code program, source program) of a control program of the display device 10 which is software for realizing the above-described functions is recorded so as to be readable by a computer. This can also be achieved by supplying the display device 10 and reading and executing the program code recorded on the recording medium by the computer (or CPU or MPU).

  Examples of the recording medium include a tape system such as a magnetic tape and a cassette tape, a magnetic disk such as a floppy (registered trademark) disk / hard disk, and an optical disk such as a CD-ROM / MO / MD / DVD / CD-R. Card system such as IC card, IC card (including memory card) / optical card, or semiconductor memory system such as mask ROM / EPROM / EEPROM / flash ROM.

  The display device 10 may be configured to be connectable to a communication network, and the program code may be supplied via the communication network. The communication network is not particularly limited. For example, the Internet, intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication. A net or the like is available. Also, the transmission medium constituting the communication network is not particularly limited. For example, even in the case of wired such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, ADSL line, etc., infrared rays such as IrDA and remote control, Bluetooth ( (Registered trademark), 802.11 wireless, HDR, mobile phone network, satellite line, terrestrial digital network, and the like can also be used. The present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.

  According to the present invention, even if the display content of the display unit cannot be grasped from the display control device side, it is possible to determine the abnormality of the driving means based on the voltage supplied from the boosting means to the output means. It can be suitably used as a display device of an electronic apparatus that displays an image such as an information processing device, a portable terminal, a communication terminal, a moving image display device, or a digital camera.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a functional block diagram illustrating a main part configuration of a display device according to an embodiment of the present invention. It is a functional block diagram which shows the principal part structure of the portable terminal containing the said display apparatus. It is a flowchart which shows the flow of the display process in the said portable terminal. It is a flowchart which shows the outline of the procedure of the process which initializes a LCD drive circuit.

Explanation of symbols

10 Display device 20 LCD control circuit (display control means)
22 Initialization circuit (initialization means)
30 LCD drive circuit (drive means)
32 Control circuit 34 Output circuit (output means)
36 Booster circuit (Boosting means)
40 LCD panel (display unit)
50 Voltage detection circuit (voltage detection means)
52 CPU
54 Power Supply Circuit 56 Key Input Unit 58 Battery 90 Mobile Terminal

Claims (8)

A display device comprising: a driving unit that displays an image on a display element of a display unit; and a display control unit that performs control to display an image on the driving unit.
The drive means
Output means for outputting an image signal for displaying an image on the display unit;
In a display device comprising: a voltage supplied to the output means; and a voltage boosting means for boosting the voltage to an output voltage necessary for outputting the image signal.
Voltage detecting means for detecting a supply voltage supplied from the boosting means to the output means;
The display device includes an initialization unit that initializes the driving unit based on whether or not the supply voltage detected by the voltage detection unit is equal to or higher than the output voltage. The voltage detection means outputs 0 when the detected supply voltage is less than the output voltage, and outputs the supply voltage to the display control means when the supply voltage is greater than or equal to the output voltage,
The display device according to claim 1, wherein the display control unit initializes the driving unit when the output from the voltage detection unit is zero. The voltage detection means further includes A / D conversion means for converting the supply voltage from an analog signal to a digital signal and outputting the digital signal,
The display device according to claim 1, wherein the display control unit initializes the driving unit when an output from the voltage detection unit is less than the output voltage.   4. The display control unit according to claim 1, wherein the display control unit determines whether to initialize the driving unit based on a plurality of detection results detected by the voltage detection unit. The display device described in 1.   5. The display device according to claim 1, wherein the display control unit initializes the driving unit based on an interrupt function triggered by an output from the voltage detection unit. A display method in a display device, comprising: a driving unit that includes a boosting unit and an output unit, and that displays an image on a display element of a display unit; and a display control unit that performs control to display an image on the driving unit. ,
The drive means
A boosting step of boosting the voltage supplied to the output means with respect to the boosting means;
An output step of causing the output means to output an image signal to be displayed on the display unit;
Voltage detection means
A detection step of detecting a supply voltage supplied from the boosting means to the output means;
The display control means is
An initialization step of initializing the drive means based on a result detected by the voltage detection means.   A display control program for operating the display device according to claim 1, wherein the computer functions as the display control means.   A computer-readable recording medium on which the program according to claim 7 is recorded.

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