JP2013198025A - Transmitter, display controller, and display device - Google Patents

Abstract

Kind Code: A1 To effectively transmit attribute information using an existing signal without providing a new signal for transmitting attribute information of image data.
A signal changing part 26 ₂ of the transmitting apparatus for transmitting data enable signal indicative of the existence range of the image data, changes the transmission timing of the data enable signal based on the attribute information of the image data transmission processing unit 26 ₃ but the display control unit for extracting attribute information based on the reception timing of the data enable signal, and transmits the data enable signal at the transmission timing which has been modified by the signal modification unit 26 _2.
[Selection] Figure 2

Description

  The present invention relates to a transmission device, a display control device, and a display device. Display control device for controlling the display of images, a transmission device for transmitting a synchronization signal for display timing control of a moving image superimposed on a still image, and a display control for receiving the synchronization signal and controlling the display of the image based on the synchronization signal The present invention relates to a display device including a device, a transmission device, and a reception device.

  In recent years, a display device such as a television or a monitor for a personal computer has been capable of high-resolution display such as 4K2K. 4K2K is a resolution in which the number of pixels in the horizontal direction is 3840 and the number of pixels in the vertical direction is 2160.

  On the other hand, 2K1K resolution is the mainstream in video sources for moving images such as television broadcasts and Blu-ray discs. 2K1K is a resolution in which the number of pixels in the horizontal direction is 1920 and the number of pixels in the vertical direction is 1080.

  When a moving image from such a video source is displayed on a display device having a 4K2K resolution, the resolution of 2K1K is generally converted to the resolution of 4K2K by scaling.

  In a general display device, a still image can be displayed superimposed on a moving image. The still image is, for example, an image such as a TV program guide, an Internet browser, or a display device setting screen.

  When a high-resolution display device displays a 2K1K resolution still image, it is conceivable to scale the still image in the same way as a moving image. However, the pixel value of a still image often changes discontinuously. Not suitable.

  Therefore, it is desirable that the still image is output at a high resolution such as 4K2K from the beginning, and is directly superimposed on the moving image after scaling. In recent years, a CPU (Central Processing Unit) capable of generating a still image with a high resolution of 4K2K has also been developed.

  Also, a communication path that connects a transmission device that generates a still image, transmits the generated still image and moving image, and a display device that receives the still image and the moving image and displays the still image superimposed on the moving image. However, when still image data having a resolution exceeding 2K1K cannot be transmitted as it is, the transmission device needs to divide and transmit 4K2K still image data.

  In this case, the transmission device displays type information indicating whether the data to be transmitted is moving image data or still image data, and a display position indicating where the image data obtained as a result of the division is displayed. Information needs to be sent to the receiving device.

  In Patent Document 1, the position (X, Y) indicated by the pointing device on the screen is detected, the timing of the trailing edge of the horizontal synchronizing signal of the image signal is delayed corresponding to X, and the vertical synchronizing signal There is disclosed an image transmission apparatus that delays the timing of the trailing edge corresponding to Y and transmits the resulting horizontal synchronization signal and vertical synchronization signal as the synchronization signal of the image signal.

  In Patent Document 2, the audio signal is time-axis compressed, the time-axis compressed audio signal, the video signal, and the control signal used for control on the signal receiving side are time-division multiplexed, and the resulting signal A signal transmission device that transmits a signal to a signal reception device via a transmission line is disclosed.

  Patent Document 3 discloses that moving image data received by an antenna and still image data divided into resolution images that can be transmitted by a transmission cable are transmitted to a display device, and whether the data to be transmitted is moving image data. A receiving device that transmits an identification signal for identifying whether it is still image data to a display device is disclosed.

JP 2002-262247 A JP 2011-223618 A JP 2010-130544 A

  However, in the prior art of Patent Document 1, information on the position indicated on the screen is directly reflected in the timing of the trailing edge of the horizontal synchronization signal or the vertical synchronization signal. It does not transmit information indicating whether it is still image data. In addition, the trailing edge of the horizontal synchronization signal or the vertical synchronization signal exists within the effective image period of the video signal, which greatly deviates from the standardized synchronization signal transmission format.

  In the prior art of Patent Document 2, since an audio signal, a video signal, and a control signal are transmitted by time division multiplexing, in this case too, the signal transmission format is greatly deviated. In the prior art of Patent Document 3, since an identification signal for identifying whether it is moving image data or still image data is transmitted separately from the synchronization signal, it is necessary to establish a communication path for transmitting the identification signal. Become.

  In view of the above circumstances, the present invention provides a transmission device capable of effectively transmitting attribute information using an existing signal without providing a new signal for transmitting attribute information of image data. An object is to provide a display control device and a display device.

  In order to solve the above-described problem, a first technical means of the present invention is a transmitting device that transmits a data enable signal indicating a range where image data exists, wherein the data enable signal is based on attribute information of the image data. The data enable signal is transmitted at the transmission timing changed by the signal changing unit to the signal changing unit that changes the transmission timing of the data and the display control device that extracts the attribute information based on the reception timing of the data enable signal And a transmission processing unit.

  According to a second technical means of the present invention, in the first technical means, the signal changing unit shows a correspondence relationship between the attribute information and a change amount of the transmission timing of the data enable signal and the attribute information. The transmission timing of the data enable signal is changed based on the indicated information.

  According to a third technical means of the present invention, in the first or second technical means, the attribute information includes information on a display position of the image data.

  According to a fourth technical means of the present invention, in any one of the first to third technical means, the attribute information includes information indicating whether or not the image data is still image data.

  A fifth technical means of the present invention is a display control device that receives a data enable signal indicating the existence range of image data and controls display of an image based on the data enable signal, wherein the attribute information of the image data A reception processing unit that receives the data enable signal transmitted at a transmission timing that has been changed based on the data, and extracts attribute information of the image data based on the reception timing at which the reception processing unit receives the data enable signal An attribute information extraction unit, and an image generation unit that generates the image based on the attribute information extracted by the attribute information extraction unit.

  According to a sixth technical means of the present invention, in the fifth technical means, the attribute information extracting unit includes information indicating a correspondence relationship between the reception timing and a change amount of the transmission timing and the attribute information. Based on this, the attribute information is extracted.

  According to a seventh technical means of the present invention, in the fifth or sixth technical means, the attribute information includes information on a display position of the image data.

  According to an eighth technical means of the present invention, in any one of the fifth to seventh technical means, the attribute information includes information indicating whether or not the image data is still image data.

  According to a ninth technical means of the present invention, there is provided a transmission device for transmitting a data enable signal indicating the existence range of image data, and display control for receiving the data enable signal and controlling display of an image based on the data enable signal. A display device comprising: a signal change unit that changes a transmission timing of the data enable signal based on attribute information of the image data; and the display control device by the signal change unit. A transmission processing unit that transmits the data enable signal at a changed transmission timing, and wherein the display control device receives the data enable signal transmitted at the transmission timing changed by the transmission device. And the reception processing unit receives the data enable signal based on the reception timing of the image data. An attribute information extraction unit for extracting the sex information, characterized in that it comprises, an image generation unit for generating the image based on the attribute information extracted by the attribute information extraction unit.

  According to a tenth technical means of the present invention, in the ninth technical means, the signal changing unit sets a correspondence relationship between the attribute information and the change amount of the transmission timing of the data enable signal and the attribute information. The transmission timing of the data enable signal is changed based on the indicated information.

  According to an eleventh technical means of the present invention, in the ninth or tenth technical means, the attribute information extraction unit determines the correspondence between the reception timing and the change amount of the transmission timing and the attribute information. The attribute information is extracted based on the indicated information.

  According to a twelfth technical means of the present invention, in any one of the ninth to eleventh technical means, the attribute information includes information on a display position of the image data.

  According to a thirteenth technical means of the present invention, in any one of the ninth to twelfth technical means, the attribute information includes information indicating whether or not the image data is still image data.

  A fourteenth technical means of the present invention is a transmitting device for transmitting a synchronization signal for controlling the display timing of a moving image superimposed on a still image, wherein the attribute information of the image data of the still image, and the synchronization signal A signal changing unit that changes a signal width of the synchronization signal based on information indicating a correspondence relationship between the signal width of the synchronization signal and the attribute information; and a change amount of the signal width of the synchronization signal and the signal width of the synchronization signal A transmission processing unit that transmits a synchronization signal having a signal width changed by the signal changing unit to a display control device that extracts the attribute information based on information indicating a correspondence relationship between the signal changing unit and the attribute information It is characterized by that.

  According to a fifteenth technical means of the present invention, in the fourteenth technical means, the attribute information includes information on a display position of the image data.

  According to a sixteenth technical means of the present invention, in the fourteenth or fifteenth technical means, the attribute information includes information indicating whether or not the image data is still image data.

  A seventeenth technical means of the present invention is a display control apparatus for receiving a synchronization signal for controlling the display timing of a moving image superimposed on a still image and controlling the display of an image based on the synchronization signal, A reception processing unit that receives a synchronization signal whose signal width has been changed based on attribute information of still image data and information indicating a correspondence between the amount of change in the signal width of the synchronization signal and the attribute information; An attribute information extraction unit that extracts attribute information of the image data based on a signal width of the synchronization signal received by the reception processing unit and information indicating the correspondence relationship, and an attribute extracted by the attribute information extraction unit An image generation unit configured to generate the image based on information.

  According to an eighteenth technical means of the present invention, in the seventeenth technical means, the attribute information includes information on a display position of the image data.

  According to a nineteenth technical means of the present invention, in the seventeenth or eighteenth technical means, the attribute information includes information indicating whether or not the image data is still image data.

  According to a twentieth technical means of the present invention, there is provided a transmitting device for transmitting a synchronization signal for display timing control of a moving image superimposed on a still image, and receiving the synchronization signal, and displaying an image based on the synchronization signal. A display control device that controls the display device, wherein the transmission device includes attribute information of the image data of the still image and a correspondence between a change amount of the signal width of the synchronization signal and the attribute information. A signal changing unit that changes a signal width of the synchronization signal based on information indicating a relationship; and a transmission processing unit that transmits a synchronization signal of the signal width changed by the signal changing unit to the display control device. The display control device is based on a reception processing unit that receives a synchronization signal whose signal width has been changed by the transmission device, a signal width of the synchronization signal received by the reception processing unit, and information indicating the correspondence relationship. , Characterized in that it comprises an attribute information extraction unit for extracting attribute information of the image data, an image generating unit for generating the image based on the attribute information extracted by the attribute information extraction unit.

  According to a twenty-first technical means of the present invention, in the twentieth technical means, the attribute information includes information on a display position of the image data.

  According to a twenty-second technical means of the present invention, in the twentieth or twenty-first technical means, the attribute information includes information indicating whether or not the image data is still image data.

  According to the present invention, since the attribute information of the image data is transmitted by changing the transmission timing of the data enable signal or the signal width of the synchronization signal, a new one is transmitted to transmit the attribute information of the image data. Therefore, it is possible to effectively transmit / receive attribute information using an existing signal without providing a special signal.

It is a figure explaining the structure of the display apparatus which concerns on Embodiment 1 of this invention. It is a figure explaining the detail of the transmission part of the transmission apparatus shown in FIG. 1, and the receiving part of a display control apparatus. It is a figure explaining the general transmission timing of a vertical synchronizing signal, a horizontal synchronizing signal, a data enable signal, and image data. FIG. 4 is a diagram showing the transmission timing diagram of FIG. 3 divided by a horizontal synchronization signal transmission cycle. It is a figure which shows the example of a change process of the transmission timing of a data enable signal. It is a figure which shows an example of the relationship between the change of a transmission timing, classification information, and display position information. It is a figure which shows the other example of a change process of the transmission timing of a data enable signal. It is a figure which shows another example of the relationship between the change of a transmission timing, classification information, and display position information. It is a figure explaining the change amount of a transmission timing. It is a flowchart which shows the process sequence of the transmission process of the attribute signal which the transmission part of a transmitter performs. It is a flowchart which shows an example of the process sequence of the image display process which a display control apparatus performs. It is a figure which shows the example of the change process of the width | variety of a vertical synchronizing signal or a horizontal synchronizing signal. It is a figure which shows the other example of the change process of the width | variety of a vertical synchronizing signal or a horizontal synchronizing signal. It is a figure explaining the change amount of the width | variety of a vertical synchronizing signal or a horizontal synchronizing signal. It is a flowchart which shows the process sequence of the transmission process of the attribute signal which the transmission part of a transmitter performs. It is a flowchart which shows an example of the process sequence of the image display process which a display control apparatus performs. It is a figure explaining the LVDS technique to which this invention was applied.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a diagram illustrating a configuration of a display device 10 according to Embodiment 1 of the present invention. As illustrated in FIG. 1, the display device 10 includes a display unit 11, a transmission device 20, and a display control device 30. The display unit 11 is a display device such as a liquid crystal panel.

  The transmission apparatus 20 includes a tuner unit 21, a decoding unit 22, a control unit 23, a frame switching unit 24, a frame switching control unit 25, and a transmission processing unit 26.

  The tuner unit 21 is a tuner that receives broadcast signals such as television broadcasts. The decoding unit 22 is a processing unit that decodes broadcast signals and generates moving image data. This moving image data is, for example, image data having a frame frequency of 60 Hz and a resolution of 1920 × 1080 (hereinafter referred to as “2K1K”).

  The control unit 23 is a device such as a CPU (Central Processing Unit) that generates still image data. This control unit 23 generates still image data displayed by an OSD (On-Screen Display) function, such as image data of a screen setting menu, program guide information included in a broadcast signal, an Internet browser, etc. Generate still image data.

  Here, the control unit 23 generates still image data having a resolution of 3840 × 2160 (hereinafter referred to as “4K2K”). However, if the maximum resolution of an image capable of transmitting data on the communication path connecting the transmission device 20 and the display control device 30 is 2K1K, the image data having a resolution of 4K2K cannot be transmitted. The unit 23 divides the still image into four parts, and outputs the still image data having the 2K1K resolution obtained as a result.

  Further, the control unit 23 will later explain the type information indicating that the generated data is still image data and the display position information indicating where the still image obtained as a result of the division is displayed. Is transmitted as attribute information to the transmitting unit 26.

  The frame switching unit 24 is a processing unit that alternately outputs a frame of moving image data generated by the decoding unit 22 and a frame of still image data generated by the control unit 23. For example, the frame switching unit 24 outputs the image data of each frame input at a frame frequency of 60 Hz at a frame frequency of 120 Hz.

  The frame switching control unit 25 is a processing unit that controls the frame switching unit 24 to cause the frame switching unit 24 to alternately output a frame of moving image data and a frame of still image data. The frame switching control unit 25 further outputs a synchronization trigger signal indicating the switching timing to the transmission unit 26.

  The transmission unit 26 is a processing unit that transmits moving image data and still image data to the display control device 30. The transmission unit 26 also transmits a vertical synchronization signal, a horizontal synchronization signal, and a data enable (DE: Data Enable) signal indicating the existence range of the image data for controlling the display timing of the image.

  Further, the transmission unit 26 transmits the attribute information described above to the display control device 30. This attribute information is transmitted by being embedded in the data enable signal by changing the transmission timing of the data enable signal.

  This attribute information includes type information indicating whether or not image data to be transmitted is still image data, and display position information indicating a display position when the image data is still image data. In this way, by transmitting the type information and the display position information to the display control device 30, the still image can be efficiently displayed on the display control device 30. A specific method for transmitting attribute information will be described in detail later.

  The display control device 30 includes reception units 31 and 32, an image scaling unit 33, an image generation unit 34, an image quality adjustment unit 35, a display control unit 36, and a control unit 37.

  The receiving units 31 and 32 are processing units that receive the image data, the vertical synchronization signal, the horizontal synchronization signal, and the data enable signal transmitted by the transmission device 20 and extract attribute information from the received data enable signal.

  The attribute information includes type information indicating whether the image data is moving image data or still image data, and display position information indicating where the image data is displayed. The attribute information extraction method will be described in detail later.

  The image scaling unit 33 is a processing unit that performs moving image scaling processing using the moving image data received from the transmission device 20, and outputs the moving image data after the scaling processing is performed to the image generation unit 34.

  Specifically, the image scaling unit 33 identifies moving image data and still image data based on the type information extracted by the receiving unit 31, and detects moving image data. Then, the image scaling unit 33 enlarges the moving image having the resolution of 2K1K to the moving image having the resolution of 4K2K, and outputs the moving image data obtained as a result of the enlargement to the image generation unit 34.

  The image generation unit 34 is a processing unit that generates image data of an image in which a moving image and a still image are superimposed. Specifically, the image generation unit 34 identifies moving image data and still image data based on the type information extracted by the reception unit 32, and detects still image data.

  The image generation unit 34 generates image data in which a still image is superimposed on a moving image using the moving image data received from the image scaling unit 33 and the still image data. At that time, the image generation unit 34 specifies the display position of the still image based on the display position information extracted by the reception unit 32, and arranges the still image at the specified display position.

  The image quality adjustment unit 35 is a processing unit that adjusts the image quality of the image data generated by the image generation unit 34. The display control unit 36 is a processing unit that outputs an image signal of an image whose image quality has been adjusted by the image quality adjustment unit 35 to the display unit 11 and causes the display unit 11 to display the image. The control unit 37 is a control unit that controls the display unit 11 and each processing unit of the display control device 30.

  Next, the transmission unit 26 of the transmission device 20 illustrated in FIG. 1 and the reception units 31 and 32 of the display control device 30 will be described in detail. FIG. 2 is a diagram illustrating details of the transmission unit 26 of the transmission device 20 and the reception unit 31 of the display control device 30 illustrated in FIG. 1. Although FIG. 2 shows details of the receiving unit 31, the details of the receiving unit 32 are also the same, and the description thereof is omitted here.

Transmission unit 26 includes a transmission buffer _261, the signal changing unit 26 _2, the transmission processing unit 26 _3. Transmission buffer 26 ₁ is a buffer memory for temporarily storing moving image data or still image data. Signal changing unit 26 _2, based on the acquired attribute information from the control unit 23 is a processing unit for changing the transmission timing of the data enable signal.

  The transmission timing changing process will be described below. FIG. 3 is a diagram illustrating general transmission timings of the vertical synchronization signal, horizontal synchronization signal, data enable signal, and image data. FIG. 3 shows the transmission timing for one frame.

  In the period shown in FIG. 3, one vertical synchronization signal is transmitted and a plurality of horizontal synchronization signals are transmitted. A data enable signal is transmitted in synchronization with the transmission timing of the image data.

  FIG. 4 is a diagram showing the transmission timing diagram of FIG. 3 divided by the horizontal synchronization signal transmission cycle. In this example, the data enable signal is transmitted at a timing after LINE N.

  FIG. 5 is a diagram illustrating an example of processing for changing the transmission timing of the data enable signal. FIG. 5 shows an example in which the transmission timings of all data enable signals are changed by one clock in the H-COUNT direction and by −1 LINE in the V-COUNT direction.

  FIG. 6 is a diagram illustrating an example of a correspondence relationship between transmission timing change, type information, and display position information. In FIG. 6, the change amount of the transmission timing is indicated by (X, Y) (X = -1, 0, +1, Y = -1, 0, +1). Here, X is the offset amount in the H-COUNT direction in FIG. 5, and Y is the offset amount in the V-COUNT direction in FIG.

  In FIG. 6A, “G” indicates that the type of the image data is still image data. “Upper left”, “Left center”, “Lower left”, “Upper center”, “Lower center” , “Upper right”, “Right center”, “Lower right”, as shown in FIG. 6B, the still image data are respectively upper left, left center, lower left, upper center, lower center, upper right, and right center. The image data is displayed at the lower right position.

  For example, when the image data to be transmitted to the display control device 30 is still image data and the display position of the still image displayed by the still image data is on the upper right, the change amount of the transmission timing is as shown in FIG. From the correspondence relationship, (+1, −1).

Thus, the signal change portion 26 _2, as shown in FIG. 5, one clock transmission timing of all of the data enable signal to the H-COUNT direction, changing -1LINE min to V-COUNT direction.

Note that when image data to be transmitted to the display control unit 30 is a moving image data, as shown in the correspondence relationship of FIG. 6 (A), the attribute information is not, the signal changing unit 26 _2, the transmission of the attribute information Not performed.

That is, the signal changing unit 26 _2, as the change amount of transmission timing in FIG. 6 (A) are shown as (0,0), changing the transmission timing of the data enable signal is not performed. In this case, the moving image data is subjected to scaling processing for enlarging the 2K1K image into the 4K1K image, as shown in FIG. 6B.

  In FIG. 5, the transmission timing is changed for all the data enable signals. However, the transmission timing may be changed only for one data enable signal.

  FIG. 7 is a diagram illustrating another example of the processing for changing the transmission timing of the data enable signal. In FIG. 7, the transmission timing of the LINE N data enable signal is changed by one clock in the H-COUNT direction. As is clear from the correspondence in FIG. 6A, this corresponds to the case where still image data is transmitted and the display position of the still image is at the right center.

  In FIG. 7, the transmission timing of the LINE N data enable signal is changed by one clock in the H-COUNT direction, but it may be changed in the V-COUNT direction. In this case, the LINE data enable signal other than LINE N also has the same amount as the LINE N data enable signal in order to avoid unnecessary horizontal lines from being included in the still image or part of the still image not being displayed. Only the transmission timing may be changed in the V-COUNT direction.

  Further, the relationship between the transmission timing change shown in FIG. 6 and the type information and the display position information is not limited to that shown in FIG. 6, and other relationships may be used. FIG. 8 is a diagram illustrating another example of the relationship between transmission timing change, type information, and display position information.

  In the example of FIG. 8, when the image data is still image data, and the display position of the still image is upper left, lower left, center, upper horizontal, lower horizontal, upper right, lower right, right vertical, the amount of change in transmission timing Are (-1, -1), (-1, 0), (-1, +1), (0, -1), (0, +1), (+1, -1), (+1, 0), It is set to (+1, +1).

  When the image data is moving image data and there is no attribute information to be transmitted, the transmission timing change amount is set to (0, 0). In this case, the transmission timing of the data enable signal is not changed, and scaling processing for enlarging the 2K1K image to the 4K1K image is performed on the moving image data as shown in FIG. 8B.

  In the above example, the case where the transmission timing of the data enable signal is changed by ± 1 clock in the H-COUNT direction and by ± 1 LINE in the V-COUNT direction has been described. However, the change amount of the transmission timing is limited to this. Is not to be done.

  FIG. 9 is a diagram for explaining the change amount of the transmission timing. Here, H-Total is the number of pixels per horizontal line, H-Sync is the length of the horizontal synchronization signal, and H-Start is the distance from the left end of one horizontal line to the start area of the image. H-Active is the horizontal length of the image.

  V-Total is the number of pixels per vertical line, V-Sync is the length of the vertical synchronization signal, and V-Start is the distance from the top of one vertical line to the start area of the image. Yes, V-Active is the vertical length of the image.

  For example, FIG. 9 shows values of H-Total = 2200, H-Sync = 16, H-Start = 38, and H-Active = 1920 as general values of the above-described parameters. In this case, the changeable amount in the H-COUNT direction is a range in which the H-Active section can be shifted left and right with the position shown in FIG. 9 as a reference. That is, the changeable amount in the H-COUNT direction is in the range of −21 (= 16−38 + 1) to +241 (= 2200−1920−38−1). Here, “+1” indicates that the H-Active section is not continuous with the H-Sync section, and “−1” indicates that the right end of the H-Active section matches the right end of the H-Total section. This is to prevent this.

  Also, in FIG. 9, values of V-Total = 1125, V-Sync = 5, V-Start = 25, and V-Active = 1080 are shown as general values of the above-described parameters. In this case, the changeable amount in the V-COUNT direction is a range in which the V-Active section can be shifted up and down on the basis of the position shown in FIG. That is, the changeable amount in the V-COUNT direction is in the range of −19 (= 5-25 + 1) to +19 (= 1125-1080-25-1). Here, “+1” indicates that the V-Active interval is not continuous with the V-Sync interval, and “−1” indicates that the lower end of the V-Active interval coincides with the lower end of the V-Total interval. This is to prevent this.

  Therefore, in this case, the position of 9956 (= (21 + 241) × (19 + 19)) can be expressed as the display position of the still image data. In addition, when the number of types of display position information is further increased, the amount of change in the transmission timing of the data enable signal as shown in FIG. 4 may be set separately for each data enable signal.

Returning to the explanation of FIG. 2, the transmission processing unit 26 _3, to the receiving portions 31 and 32 of the display control unit 30 is the processing unit that transmits the image data, the vertical synchronizing signal, horizontal synchronizing signal, a data enable signal . The transmission processing unit 26 _3, and the moving image data ₄₀ 1, 40 _2, and transmits the still image data ₄₁ 1, 41 ₂ alternately. The data enable signal is a signal in which image data type information and display position information are embedded by the method described with reference to FIGS.

The reception unit 31 of the display control device 30 includes a reception processing unit 31 ₁ , a reception buffer 31 ₂ , and an attribute information extraction unit 31 ₃ .

Reception processing unit 31 _1, image data transmitted by the transmitting unit 26 of the transmitting apparatus 20, a vertical synchronizing signal, horizontal synchronizing signals, a processing unit for receiving a data enable signal. Receive buffer 31 ₂ is a buffer memory for temporarily storing the image data reception processing unit 31 ₁ receives.

Attribute information extraction unit 31 _3, and detects the change amount of transmission timing of the data enable signal reception processing unit 31 ₁ receives, using a correspondence relationship as shown in FIG. 6 (A) and FIG. 8 (A) The processing unit extracts attribute information of image data.

Detection of the change amount of transmission timing is performed by the attribute information extraction unit 31 ₃ detects a deviation from the specified value of transmission timing stored. As described above, this attribute information includes image data type information and display position information.

  Thus, based on the information indicating the correspondence between the change amount of the transmission timing of the data enable signal and the attribute information, the transmission timing of the data enable signal is changed and the attribute information is extracted. The attribute information can be effectively transmitted using the existing data enable signal without providing a new signal for transmitting the attribute information of the image data.

  Next, attribute signal transmission processing performed by the transmission unit 26 of the transmission device 20 will be described. FIG. 10 is a flowchart illustrating a processing procedure of attribute signal transmission processing performed by the transmission unit 26 of the transmission device 20.

  First, when receiving a synchronization trigger signal from the frame switching control unit 25 (step S101), the transmission unit 26 determines whether there is attribute information generated by the control unit 23 (step S102).

  If there is no attribute information (NO in step S102), the transmission unit 26 transmits a data enable signal and moving image data at a predetermined transmission timing (step S103), and this process ends.

  When there is attribute information (in the case of YES in step S102), the transmission unit 26 determines the transmission timing corresponding to the attribute information based on the correspondence shown in FIG. 6A and FIG. 8A. A change amount is determined (step S104).

  Then, the transmission unit 26 transmits the data enable signal and still image data to the display control device 30 at the determined transmission timing (step S105), and this process ends.

  Next, a processing procedure of image display processing performed by the display control device 30 will be described. FIG. 11 is a flowchart illustrating an example of a processing procedure of image display processing performed by the display control device 30.

  First, the receiving unit 32 of the display control device 30 detects a data enable signal (step S201). Then, the receiving unit 32 determines whether or not the transmission timing of the data enable signal has been changed (step S202).

  If the transmission timing has not been changed (NO in step S202), the display control unit 36 causes the display unit 11 to display the moving image that has been scaled by the image scaling unit 33 (step S203). finish.

  When there is a change in transmission timing (in the case of YES in step S202), the receiving unit 32 changes the amount of change in transmission timing based on the correspondence as shown in FIG. 6A or FIG. 8A. The attribute information corresponding to is extracted (step S204). This attribute information includes type information indicating that the image data is still image data, and still image display position information.

  Then, the image generation unit 34 generates image data in which the still image and the moving image that has been scaled by the image scaling unit 33 are superimposed (step S205). Here, the still image is superimposed at a position specified by the display position information.

  Then, the display control unit 36 displays an image on the display unit 11 based on the generated image data (step S206), and this process ends.

(Embodiment 2)
Next, Embodiment 2 of the present invention will be described. The configuration of the display device 10 in the second embodiment is almost the same as that shown in FIGS. 1 and 2, but in the first embodiment, transmission of attribute information is executed by changing the transmission timing of the data enable signal. On the other hand, in the second embodiment, transmission of attribute information is executed by changing the width of the vertical synchronization signal or horizontal synchronization signal. This point will be described in detail below.

First, configurations of the transmission unit 26 and the reception units 31 and 32 according to the second embodiment will be described with reference to FIG. Signal changing unit 26 ₂ in the transmission section 26 of the second embodiment, based on the attribute information received from the control unit 23 of the transmission device 20, changing the width of the vertical synchronizing signal and a horizontal synchronizing signal.

  In this case, the same correspondence as that shown in FIGS. 6 and 8 can be used. In this case, however, X in (X, Y) (X = -1, 0, +1, Y = -1, 0, +1) in FIGS. 6 and 8 is an increase in the width of the vertical synchronizing signal, and Y is This represents an increase in the width of the horizontal synchronizing signal.

FIG. 12 is a diagram illustrating an example of processing for changing the width of the vertical synchronization signal or the horizontal synchronization signal. FIG. 12 shows an example in which still image data whose display position is at the lower right is transmitted. In this case, the correspondence relation of FIG. 6 (A), the amount of change in width of the vertical synchronizing signal and the horizontal synchronization signal (+ 1, + 1) and since, signal changing part 26 _2, 1 LINE partial width of the vertical synchronizing signal Increase the width of the horizontal sync signal by one clock.

When the image data is still image data and the display position of the still image data is upper left, left center, lower left, upper center, lower center, upper right, right center, the amount of change in the width of the vertical sync signal and horizontal sync signal is (-1, -1), (-1, 0), (-1, +1), (0, -1), (0, +1), (+1, -1), (+1, 0) respectively. since, the signal changing unit 26 ₂ changes the width of the vertical and horizontal synchronizing signals in response to each change amount.

Note that when image data to be transmitted to the display control unit 30 is a moving image data, as shown in the correspondence relationship of FIG. 6 (A), the attribute information is not, the signal changing unit 26 _2, the transmission of the attribute information Not performed.

That is, the signal changing unit 26 _2, as the change amount of transmission timing in FIG. 6 (A) are shown as (0,0), changing the width of the vertical synchronizing signal and the horizontal synchronizing signal is not performed. In this case, the moving image data is subjected to scaling processing for enlarging the 2K1K image into the 4K1K image, as shown in FIG. 6B.

  In FIG. 12, the signal width is changed only for a certain horizontal synchronizing signal, but the signal width may be changed for all horizontal synchronizing signals.

  FIG. 13 is a diagram illustrating another example of the process of changing the width of the vertical synchronization signal or the horizontal synchronization signal. In FIG. 13, the width of the vertical synchronization signal is increased by 1 LINE, and the width of all horizontal synchronization signals is increased by 1 clock. As is apparent from the correspondence relationship in FIG. 6A, this corresponds to the case where still image data is transmitted and the still image display position is at the lower right.

  In the above-described example, the case where the width of the vertical synchronization signal is changed by ± 1 LINE and the width of the horizontal synchronization signal by ± 1 clock has been described. It is not limited.

  FIG. 14 is a diagram for explaining the amount of change in the width of the vertical synchronization signal or horizontal synchronization signal. Here, H-Total, H-Sync, H-Start, H-Active, V-Total, V-Sync, V-Start, and V-Active are parameters similar to those described in FIG.

  For example, FIG. 14 shows values of H-Total = 2200, H-Sync = 16, H-Start = 38, and H-Active = 1920 as general values of the above-described parameters. In this case, the changeable amount of the width of the horizontal synchronization signal is a range in which the width of the H-Sync section can be increased or decreased in the left-right direction with reference to the width shown in FIG. That is, the changeable amount of the width of the horizontal synchronizing signal is in the range of −15 (= 0−16 + 1) to +21 (= 38−16−1). Here, “+1” prevents the width of the H-Sync section from becoming 0, and “−1” prevents the right end of the H-Sync section from matching the left end of the H-Active section. Is for.

  FIG. 14 also shows values of V-Total = 1125, V-Sync = 5, V-Start = 25, and V-Active = 1080 as general values of the above-described parameters. In this case, the changeable amount of the width of the vertical synchronization signal is a range in which the width of the V-Sync section can be increased or decreased in the vertical direction with reference to the width shown in FIG. That is, the changeable amount of the width of the vertical synchronization signal is in the range of −4 (= 0−5 + 1) to +19 (= 25−5-1). Here, “+1” prevents the width of the V-Sync section from becoming 0, and “−1” prevents the lower end of the V-Sync section from being coincident with the upper end of the V-Active section. Is for.

  Therefore, in this case, the position of 828 (= (15 + 21) × (4 + 19)) can be expressed as the display position of the still image data. Further, when the number of types of display position information is further increased, the amount of change in the width of the horizontal synchronization signal as shown in FIG. 4 may be set separately for each horizontal synchronization signal.

Returning to the explanation of FIG. 2, the transmission processing unit 26 _3, to the receiving portions 31 and 32 of the display control unit 30 is the processing unit that transmits the image data, the vertical synchronizing signal, horizontal synchronizing signal, a data enable signal . The transmission processing unit 26 _3, and the moving image data ₄₀ 1, 40 _2, and transmits the still image data ₄₁ 1, 41 ₂ alternately. The vertical synchronization signal and the horizontal synchronization signal are signals in which image data type information and display position information are embedded by the method described with reference to FIGS.

Further, the reception processing unit 31 ₁ of the display controller 30, image data transmitted by the transmitting unit 26 of the transmitting apparatus 20, a vertical synchronizing signal, horizontal synchronizing signal, receives the data enable signal. Receive buffer 31 ₂ temporarily stores the image data reception processing unit 31 ₁ receives.

Attribute information extraction unit 31 _3, vertical synchronization signal reception processing unit 31 ₁ receives, detects the amount of change in the width of the horizontal synchronization signal, Fig. 6 (A) and the indicated such correspondence FIG 8 (A) Is used to extract attribute information of image data.

Vertical sync signal, detection of the amount of change in the width of the horizontal synchronizing signal, vertical synchronizing signal attribute information extraction unit 31 ₃ is stored, it is performed by detecting a deviation from the specified value of the width of the horizontal synchronizing signal. As described above, this attribute information includes image data type information and display position information.

  As described above, the width of the vertical synchronization signal and the horizontal synchronization signal is changed based on the information indicating the correspondence between the amount of change in the width of the vertical synchronization signal and the horizontal synchronization signal and the attribute information. Since the extraction is performed, the attribute information can be effectively transmitted using the existing vertical synchronizing signal and horizontal synchronizing signal without providing a new signal for transmitting the attribute information of the image data.

  Next, attribute signal transmission processing performed by the transmission unit 26 of the transmission device 20 will be described. FIG. 15 is a flowchart illustrating a processing procedure of attribute signal transmission processing performed by the transmission unit 26 of the transmission device 20.

  First, when receiving the synchronization trigger signal from the frame switching control unit 25 (step S301), the transmission unit 26 determines whether there is attribute information generated by the control unit 23 (step S302).

  If there is no attribute information (NO in step S302), the transmission unit 26 transmits a vertical synchronization signal and a horizontal synchronization signal with a predetermined width (step S303), and this process ends.

  When there is attribute information (YES in step S302), the transmission unit 26 uses the vertical synchronization signal corresponding to the attribute information based on the correspondence shown in FIG. 6A and FIG. 8A. Then, the amount of change in the width of the horizontal synchronizing signal is determined (step S304).

  Then, the transmission unit 26 transmits the vertical synchronization signal and horizontal synchronization signal having the determined width to the display control device 30 (step S305), and this process ends.

  Next, a processing procedure of image display processing performed by the display control device 30 will be described. FIG. 16 is a flowchart illustrating an example of a processing procedure of image display processing performed by the display control device 30.

  First, the receiving unit 32 of the display control device 30 detects a vertical synchronization signal and a horizontal synchronization signal (step S401). Then, the reception unit 32 determines whether or not the widths of the vertical synchronization signal and the horizontal synchronization signal have been changed (Step S402).

  When there is no change in the width of the vertical synchronization signal and the horizontal synchronization signal (NO in step S402), the display control unit 36 causes the display unit 11 to display the moving image that has been scaled by the image scaling unit 33 ( Step S403), this process ends.

  When there is a change in transmission timing (in the case of YES in step S402), the reception unit 32 determines the vertical synchronization signal and the horizontal based on the correspondence relationship illustrated in FIG. 6A and FIG. 8A. Attribute information corresponding to the change amount of the width of the synchronization signal is extracted (step S404). This attribute information includes type information indicating that the image data is still image data, and still image display position information.

  Then, the image generation unit 34 generates image data in which the still image and the moving image that has been scaled by the image scaling unit 33 are superimposed (step S405). Here, the still image is superimposed at a position specified by the display position information.

  Then, the display control unit 36 displays an image on the display unit 11 based on the generated image data (step S406), and this process ends.

  The present invention is not limited to the above-described embodiments, and various modifications and corrections can be made without departing from the scope of the present invention.

  For example, the present invention can be applied to LVDS (Low Voltage Differential Signaling) technology. FIG. 17 is a diagram for explaining the LVDS technique to which the present invention is applied.

  The transmission unit 26 and the reception unit 31 illustrated in FIG. 17 are respectively used as the transmission unit 26 and the reception unit 31 in the transmission device 20 and the display control device 30 illustrated in FIG.

Transmission unit 26 shown in FIG. 17 includes a transmission buffer _261, the signal changing unit 26 _2, the transmission processing unit 26 _3.

Transmission buffer 26 ₁ is a buffer memory for temporarily storing image data. Signal changing unit 26 _2, based on the attribute information received from the control unit 23 of the transmitting apparatus 20 to change the transmission timing of the data enable signal in the same manner as in Example 1, in the same manner as in Example 2 This is a processing unit for changing the width of the vertical synchronizing signal and the horizontal synchronizing signal.

The transmission processing unit 26 _3, to the receiving portions 31 and 32 of the display control unit 30 is a processing unit that transmits the image data, the vertical synchronizing signal, horizontal synchronizing signal, a data enable signal. The vertical synchronization signal, horizontal synchronization signal, or data enable signal is a signal in which image data type information and display position information are embedded.

Here, the transmission processing unit 26 ₃ converts the image data, the vertical synchronizing signal, horizontal synchronizing signals, the parallel signals of the data enable signal to a serial signal, and outputs a serial signal obtained by the conversion as a differential signal.

On the other hand, the reception unit 31 of the display control device 30 includes a reception processing unit 31 ₁ , a reception buffer 31 ₂ , and an attribute information extraction unit 31 ₃ .

Reception processing unit 31 ₁ is a processing unit that receives the serial signal transmitted by the transmission section 26 of transmission device 20 converts the received serial signal into a parallel signal. This parallel signal includes image data, a vertical synchronization signal, a horizontal synchronization signal, and a data enable signal. Receive buffer 31 ₂ is a buffer memory for temporarily storing the image data reception processing unit 31 ₁ receives.

Attribute information extraction unit 31 _3, changes the amount of transmission timing of the data enable signal reception processing unit 31 ₁ receives or detects the amount of change in width of the vertical synchronizing signal and a horizontal synchronizing signal, Embodiment 1 and Embodiment 2 is a processing unit that extracts the attribute information of the image data by using the correspondence relationship described in 2. As described above, this attribute information includes image data type information and display position information.

  Then, using this attribute information, a still image and a moving image are superimposed, and an image obtained as a result is displayed. Specifically, when the type information indicates that the image data is still image data, an image in which the still image is arranged at the position specified by the display position information and the still image and the moving image are superimposed. Is displayed. When the type information indicates that the image data is not still image data, the moving image to which the scaling process is applied is displayed as it is. Thus, the present invention can also be applied to the LVDS technology.

DESCRIPTION OF SYMBOLS 10 ... Display apparatus, 11 ... Display part, 20 ... Transmission apparatus, 21 ... Tuner part, 22 ... Decoding part, 23 ... Control part, 24 ... Frame switching part, 25 ... Frame switching control part, 26 ... Transmission processing part, 26 DESCRIPTION OF SYMBOLS ₁ ... Transmission buffer, 26 ₂ ... Signal change part, 26 ₃ ... Transmission processing part, 30 ... Display control apparatus, 31, 32 ... Reception part, 31 ₁ ... Reception processing part, 31 ₂ ... Reception buffer, 31 ₃ ... Attribute information Extraction unit 33 ... Image scaling unit 34 ... Image generation unit 35 ... Image quality adjustment unit 36 ... Display control unit 37 ... Control unit

Claims (22)

A transmission device that transmits a data enable signal indicating an existing range of image data,
A signal changing unit that changes transmission timing of the data enable signal based on attribute information of the image data;
A transmission processing unit that transmits the data enable signal at a transmission timing changed by the signal change unit to a display control device that extracts the attribute information based on a reception timing of the data enable signal;
A transmission device comprising:   The signal changing unit changes the transmission timing of the data enable signal based on the attribute information and information indicating a correspondence relationship between a change amount of the transmission timing of the data enable signal and the attribute information. The transmission device according to claim 1.   The transmission apparatus according to claim 1, wherein the attribute information includes information on a display position of the image data.   The transmission apparatus according to claim 1, wherein the attribute information includes information indicating whether the image data is still image data. A display control device that receives a data enable signal indicating a presence range of image data and controls display of an image based on the data enable signal,
A reception processing unit that receives the data enable signal transmitted at a transmission timing changed based on the attribute information of the image data;
An attribute information extraction unit that extracts attribute information of the image data based on a reception timing at which the reception processing unit receives the data enable signal;
An image generation unit that generates the image based on the attribute information extracted by the attribute information extraction unit;
A display control apparatus comprising:   The attribute information extraction unit extracts the attribute information based on the reception timing and information indicating a correspondence relationship between the change amount of the transmission timing and the attribute information. The display control apparatus according to 1.   The display control apparatus according to claim 5, wherein the attribute information includes information on a display position of the image data.   The display control apparatus according to claim 5, wherein the attribute information includes information indicating whether the image data is still image data. A display device comprising: a transmission device that transmits a data enable signal indicating a presence range of image data; and a display control device that receives the data enable signal and controls display of an image based on the data enable signal,
The transmitter is
A signal changing unit that changes transmission timing of the data enable signal based on attribute information of the image data;
A transmission processing unit that transmits the data enable signal to the display control device at the transmission timing changed by the signal changing unit;
With
The display control device includes:
A reception processing unit that receives the data enable signal transmitted at the transmission timing changed by the transmission device;
An attribute information extraction unit that extracts attribute information of the image data based on a reception timing at which the reception processing unit receives the data enable signal;
An image generation unit that generates the image based on the attribute information extracted by the attribute information extraction unit;
A display device comprising:   The signal changing unit changes the transmission timing of the data enable signal based on the attribute information and information indicating a correspondence relationship between a change amount of the transmission timing of the data enable signal and the attribute information. The display device according to claim 9.   The attribute information extraction unit extracts the attribute information based on the reception timing and information indicating a correspondence relationship between the change amount of the transmission timing and the attribute information. Or the display apparatus of 10.   The display device according to claim 9, wherein the attribute information includes information on a display position of the image data.   The display device according to claim 9, wherein the attribute information includes information indicating whether the image data is still image data. A transmission device for transmitting a synchronization signal for display timing control of a moving image to be superimposed on a still image,
Based on attribute information of the image data of the still image and information indicating a correspondence relationship between the signal width of the synchronization signal and the attribute information, a signal changing unit that changes the signal width of the synchronization signal;
The signal change unit changes the display control device to extract the attribute information based on the signal width of the synchronization signal and the amount of change in the signal width of the synchronization signal and the information indicating the correspondence relationship between the attribute information. A transmission processing unit for transmitting a synchronization signal having a predetermined signal width;
A transmission device comprising:   15. The transmission apparatus according to claim 14, wherein the attribute information includes information on a display position of the image data.   16. The transmission apparatus according to claim 14, wherein the attribute information includes information indicating whether the image data is still image data. A display control device that receives a synchronization signal for display timing control of a moving image superimposed on a still image, and controls display of an image based on the synchronization signal,
A reception processing unit for receiving a synchronization signal whose signal width is changed based on attribute information of the image data of the still image and information indicating a correspondence relationship between a change amount of the signal width of the synchronization signal and the attribute information; ,
An attribute information extraction unit that extracts attribute information of the image data based on the signal width of the synchronization signal received by the reception processing unit and information indicating the correspondence;
An image generation unit that generates the image based on the attribute information extracted by the attribute information extraction unit;
A display control apparatus comprising:   The display control apparatus according to claim 17, wherein the attribute information includes information on a display position of the image data.   The display control apparatus according to claim 17, wherein the attribute information includes information indicating whether the image data is still image data. A display comprising: a transmission device that transmits a synchronization signal for controlling display timing of a moving image superimposed on a still image; and a display control device that receives the synchronization signal and controls display of an image based on the synchronization signal A device,
The transmitter is
A signal changing unit that changes the signal width of the synchronization signal based on attribute information of the image data of the still image and information indicating a correspondence relationship between a change amount of the signal width of the synchronization signal and the attribute information; ,
A transmission processing unit that transmits a synchronization signal having a signal width changed by the signal changing unit to the display control device;
With
The display control device includes:
A reception processing unit that receives a synchronization signal whose signal width has been changed by the transmission device;
An attribute information extraction unit that extracts attribute information of the image data based on the signal width of the synchronization signal received by the reception processing unit and information indicating the correspondence;
An image generation unit that generates the image based on the attribute information extracted by the attribute information extraction unit;
A display device comprising:   The display device according to claim 20, wherein the attribute information includes information on a display position of the image data.   The display device according to claim 20 or 21, wherein the attribute information includes information indicating whether the image data is still image data.

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