JP2013218002A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a display that maximizes utilization of a display panel of a high resolution in limited capacitance of a transmission line in display devices in which image data of a predetermined size is output from an output unit to a display unit via the transmission line to display an image indicative of the image data.SOLUTION: Let us assume that the transmission line has transmission line capacitance capable of transmitting image data of the same magnification as image data of a predetermined size at a predetermined frame rate. An output unit of the display device (exemplified as a decode block 1) generates a plurality of pieces of different image data having the predetermined size for configuring display target image data of the same size as the number of pixels in a display unit, determines the transmission frame rate for each of the plurality of pieces of image data and outputs the display target image data to the display unit in a time division.

Description

  The present invention relates to a display device, and more particularly to a display device capable of high-resolution display.

  At present, as a display device such as a television device or a monitor device, a device including a so-called Full HD (High Definition) display panel having a resolution of 2K1K (1920 × 1080 pixels) is mainly used. On the other hand, the demand for higher-definition display panels is also increasing, 4K2K size video, super high-definition video (8K4K size video) having 16 times the number of pixels (7680 × 4320 pixels) of Full HD, and 4 more Development of a display panel for displaying a 16K8K size image having twice the number of pixels and a display device including such a display panel have also been actively developed. Here, 4K2K means QFHD (Quad Full High Definition) having four times as many pixels as Full HD (3840 × 2160 pixels), 4K (4096 × 2160 pixels) defined by the standard of digital cinema, etc. Point to.

  On the other hand, video signals output from external video playback devices such as tuners, recorders, and players, and video signals decoded by receiving broadcast signals inside the display device are mainly 2K1K video. In addition, manufacturing a dedicated LSI (Large Scale Integrated Circuit) for a 4K2K size or the like as a receiving device for receiving an external video signal or a video signal from a broadcast wave requires a great investment. And Under such circumstances, an LSI that processes 2K1K size video data must be used as the receiving device.

  Therefore, when the video signal received by the receiving device is displayed on the full screen on the display panel having a resolution exceeding 2K1K as described above, the video data indicated by the video signal received by the receiving device is increased in resolution by scaling, It will be displayed on the display panel.

  Such a conventional display device will be briefly described with reference to FIG. In the display device illustrated in FIG. 1, a decode block 100 and a display block 110 are connected via a transmission path, and the display block 110 is provided with a liquid crystal panel unit 115 having a number of pixels of 4K2K size. The decoding block 100 includes a tuner unit 101 that receives a video signal from a broadcast wave, a decoding unit 102 that decodes the video signal received by the tuner unit 101, and a CPU (Central Processing Unit) 103 that controls them. The decoding unit 102 transmits the video of 1920 × 1080 pixels and the data of the electronic program guide to the display block 110 side via the transmission path.

  The display block 110 receives this data and performs frame rate conversion, a frame rate conversion unit 111, a scaling unit 112 that scales the data after frame rate conversion into 3980 × 2160 pixel data, and the scaled data An image quality adjustment unit 113 that performs image quality adjustment, and a panel control unit 114 that performs control to display the data after image quality adjustment on the liquid crystal panel unit 115. The CPU 103 also controls each unit 111 to 115 of the display block 110. Therefore, actually, a signal for control is transmitted in addition to video and electronic program guide data through the transmission path. Of course, these transmission paths may be divided without multiplexing.

  On the display panel, graphic data such as OSD (On Screen Display) image data, photo data, and PC output image data may be displayed superimposed on video data. There is no need to superimpose video data, and only graphic data can be displayed. Since the graphic data itself is not suitable for scaling because there are many discontinuous data when viewed in time series, when displaying on a high-resolution display panel such as 4K2K size, the resolution is first increased and then scaling is performed. It is superimposed on the subsequent video data and displayed dot-by-dot. Such creation of high-resolution graphic data can be adequately handled in recent years when CPU (Central Processing Unit) speeds up.

  Regarding multi-window (multi-screen) display, Patent Document 1 discloses a receiver that outputs a multi-screen signal for simultaneously displaying images of a plurality of channels on one screen to the display unit side. This receiver receives a plurality of time-division multiplexed channels, simultaneously decodes a plurality of channels from the received signals, and outputs them as a multi-screen signal.

  Patent Document 2 discloses a system that displays a multi-window image generated by a PC (personal computer) on a display device. In this system, multiple windows are displayed at the same time according to the priority order indicating which window is to be placed in front, so that the window size and position can be changed only by managing the overlapping order of the windows. There is an effect that it is not necessary to consider the influence on other windows.

  Further, as a technique for synthesizing video using a display panel having a high resolution and a receiving device having a panel resolution lower than that, Patent Literature 3 is disclosed for reducing the transmission amount, and Patent Literature 4 for a transmission method in time division. Is disclosed.

  Patent Document 3 discloses the transmission amount of image data in an image display system including a PC that transmits image data based on a predetermined drawing command and a reception-side monitor that displays image data received from the PC on a panel. Techniques for reducing are disclosed. Here, the PC is configured to draw data corresponding to the panel resolution on the internal frame memory, and transmits an area in which a change has occurred on the screen (change area) due to the drawing command. An area is determined, and image data in the transmission area is transmitted to the receiving monitor with control information indicating the transmission area added to the header. Based on the received control information, the reception-side monitor expands the received image data in the transmission area to an internal frame memory, updates the image data, and displays it on the panel. That is, this system is configured to transmit the data of the change area detected by the PC to the receiving monitor and copy it to the frame memory of the receiving monitor.

  A broadcast receiver described in Patent Literature 4 receives a video signal indicating a moving image, generates a still image, and outputs the received image, and outputs a moving image or a still image output from the receiving device. And a display device that displays at a resolution exceeding that. Here, the receiving device outputs a moving image obtained by converting a video signal received from the outside to the first resolution, and a still image having a second resolution higher than the first resolution in response to an instruction from the outside. Generating a divided still image obtained by dividing the second resolution still image into the first resolution, and generating the divided still image and the first resolution moving image for each frame (that is, when Multiprocessing means for outputting (by division). In addition, the display device restores the divided still image to the still image of the second resolution, the display unit that displays the moving image and the still image of the second resolution, the scaling processing unit that expands the moving image of the first resolution, and And a blend processing means for displaying the expanded first resolution moving image and the restored second resolution still image on the display means. The moving image and the still image can be distinguished by transmitting an identification signal from the receiving device to the display device and determining the identification signal on the display device side.

  Further, in order to take advantage of higher resolution of the display panel, the transmission path can be configured to support higher resolution. In the display device shown in FIG. 2, a decode block 200 and a display block 210 are connected by four transmission lines, and the display block 210 is provided with a liquid crystal panel unit 216 having a 4K2K size pixel number. The decode block 200 includes a tuner unit 201 that receives a video signal from a broadcast wave, a decode unit 202 that decodes the video signal received by the tuner unit 201, and a CPU 203 that controls them. The decoding unit 202 transmits video of 1920 × 1080 pixels per one transmission path and data of an electronic program guide to the display block 110 side. Note that the transmission line may be configured to transmit four images of 1920 × 1080 pixels and data of the electronic program guide by one transmission line even if there are not physically four transmission lines.

  The display block 210 receives these data and creates an image of 3980 × 2160 pixels corresponding to the entire screen of the liquid crystal panel unit 216, and frame rate conversion that performs frame rate conversion on the created image 212, a scaling unit 213 that scales the data after the frame rate conversion into data of an arbitrary size as necessary, an image quality adjustment unit 214 that performs image quality adjustment on the scaled data, and a post-image quality adjustment And a panel control unit 215 that performs control to display data on the liquid crystal panel unit 216. The CPU 203 also controls each unit 211 to 216 of the display block 210. Therefore, actually, a signal for control is transmitted in addition to video and electronic program guide data through the transmission path. Of course, these transmission paths may be divided without multiplexing.

JP-A-5-328321 JP-A-6-149527 JP 2002-278526 A JP 2010-130544 A

  However, the display device configured as shown in FIG. 1 has a small transmission path capacity on the display panel side, and cannot be said to display using a high-resolution display panel. Since the image data is scaled up by a subsequent scaling unit and character blurring occurs, it cannot be said that an OSD image utilizing a high-resolution display panel can be provided.

  Further, in the technologies described in Patent Documents 1 and 2, image data of any window is transmitted at the same transmission frame rate while the transmission path capacity to the display panel side is limited. Therefore, with these techniques, since all windows are displayed with uniform definition, it cannot be said that display utilizing a high-resolution display panel can be performed. Note that the priority order in the system described in Patent Document 2 indicates which window is placed in front, and is independent of the transmission frame rate.

  In addition, the technique described in Patent Document 3 assumes only a case where a transmission target from a PC to a receiving monitor is a still image, and does not correspond to a change in a transmission frame rate. Therefore, in this technology as well, it cannot be said that display using a high-resolution display panel can be performed with a limited transmission path capacity.

  In the technique described in Patent Document 4, data transmission is performed while switching between still image data and moving image data in a time-sharing manner. At that time, the moving image is transmitted at a predetermined transmission frame rate. A divided still image that is transmitted and divided into the same resolution as the moving image is also transmitted at a predetermined transmission frame rate (the same transmission frame rate as the moving image). For this reason, since all the windows of the display panel are displayed with uniform definition, it cannot be said that display using the high-resolution display panel can be performed sufficiently.

  On the other hand, the display device configured as shown in FIG. 2 can make use of a high-resolution display panel, but has a large transmission path capacity and high cost.

  The present invention has been made in view of the above situation, and an object of the present invention is to output image data of a predetermined size from an output unit to a display unit via a transmission path, and to display an image indicated by the image data. In a display device for display, display is performed by making the best use of a high-resolution display panel within a limited transmission path capacity.

  In order to solve the above-described problem, a first technical means of the present invention includes an output unit that outputs image data of a predetermined size to a transmission line, and is connected to the output unit via the transmission line. A display unit that displays an image to be displayed, wherein the transmission path has a transmission path capacity capable of transmitting image data of the same size as the image data of the predetermined size at a predetermined frame rate, and The output unit generates a plurality of different image data having the predetermined size for constituting display target image data having the same size as the number of pixels of the display unit, and for each of the generated plurality of image data A transmission frame rate is determined, and the display target image data is output to the display unit in a time-sharing manner.

  According to a second technical means of the present invention, in the first technical means, when the output unit includes at least one of the plurality of generated image data as still image data, each of the plurality of image data On the other hand, a transmission frame rate is determined, and the display target image data is output to the display unit in a time division manner.

  According to a third technical means of the present invention, in the first technical means, the output unit displays at least one of the generated plurality of image data specified as other image data and input to the output unit. When the image data has different frame rates, a transmission frame rate is determined for each of the plurality of image data, and the display target image data is output to the display unit in a time division manner. is there.

  According to a fourth technical means of the present invention, in any one of the first to third technical means, the output unit determines a priority indicating a degree of output preferentially for each image data. For each of the image data, a determination unit determines the transmission frame rate according to the priority determined by the priority determination unit, and determines a reading source of the image data to be output according to the determined transmission frame rate. And an output data selection unit to be selected.

  According to a fifth technical means of the present invention, in the fourth technical means, the priority determination unit is based on whether the image data is moving image data or still image data, and / or The priority is determined based on whether the image data is currently on a user operation screen.

  According to a sixth technical means of the present invention, in any one of the first to fifth technical means, the output unit is configured to display the display location on the display unit and the display unit for each image data with respect to the display unit. The present invention is characterized in that information indicating a transmission frame rate is transmitted.

  According to a seventh technical means of the present invention, in any one of the first to sixth technical means, the output unit determines the transmission frame rate in advance when the image data is moving image data. It is characterized in that it is selected and determined from a plurality of values obtained.

  According to the present invention, in a display device that outputs image data of a predetermined size from an output unit to a display unit via a transmission line and displays an image indicated by the image data, the display device displays a high capacity within a limited transmission line capacity. It is possible to perform display that makes the most of the resolution display panel.

It is a block diagram which shows the example of 1 structure of the conventional display apparatus. It is a block diagram which shows the other structural example of the conventional display apparatus. It is a block diagram which shows one structural example of the decoding block in the display apparatus which concerns on this invention. FIG. 4 is a block diagram illustrating a configuration example of a display block connected to the decode block of FIG. 3. It is a figure for demonstrating the principal part in the decoding block of FIG. It is a flowchart for demonstrating an example of the process in the decoding block of FIG. It is a flowchart following FIG. FIG. 5 is a diagram for explaining an example of a relationship between a frame transmitted from the decoding block in FIG. 3 and a display screen for displaying the frame in the display block in FIG. 4. It is a figure for demonstrating the transmission timing of the flame | frame of FIG. FIG. 5 is a diagram for explaining another example of a relationship between a frame transmitted from the decoding block in FIG. 3 and a display screen for displaying the frame in the display block in FIG. 4. FIG. 5 is a diagram for explaining another example of a relationship between a frame transmitted from the decoding block in FIG. 3 and a display screen for displaying the frame in the display block in FIG. 4. FIG. 5 is a diagram for explaining another example of a relationship between a frame transmitted from the decoding block in FIG. 3 and a display screen for displaying the frame in the display block in FIG. 4. FIG. 5 is a diagram for explaining another example of a relationship between a frame transmitted from the decoding block in FIG. 3 and a display screen for displaying the frame in the display block in FIG. 4.

  A display device according to the present invention includes an output unit that outputs image data of a predetermined size to a transmission line, and a display unit that is connected to the output unit via the transmission line and displays an image indicated by the image data. For example, a television apparatus, a monitor apparatus, etc. are mentioned.

  FIG. 3 is a block diagram showing a configuration example of the decode block in the display device according to the present invention, and FIG. 4 is a block diagram showing a configuration example of the display block connected to the decode block of FIG. FIG. 5 is a diagram for explaining a main part in the decode block of FIG.

  One configuration example of the display device according to the present invention is formed by connecting a decode block 1 illustrated in FIG. 3 and a display block 2 illustrated in FIG. 4 via a transmission line. The display block 2 is provided with a liquid crystal panel unit 28 having a high resolution liquid crystal panel and a backlight. As the liquid crystal panel, a liquid crystal panel having a 4K2K size pixel will be described. The display panel in the display block 2 is not limited to a liquid crystal panel, but may be of any display system such as an organic electroluminescence panel, an LED (Light Emitting Diode) panel, or a plasma display panel. Is not limited to 4K2K size.

  The decode block 1 can be composed of, for example, one or a plurality of LSIs, and the display block 2 can also be composed of, for example, one or a plurality of LSIs other than the liquid crystal panel unit 28 (and the panel control unit 27).

  The decode block 1 includes a tuner unit 11 that receives a video signal from a broadcast wave, a decode unit 12 that decodes a video signal received by the tuner unit 11, and a CPU 16 that controls them. The decode block 1 is an example of the output unit, generates image data of a predetermined size by decoding, and outputs it to the transmission path. As the output unit, for example, a reception block including an interface unit for receiving a video signal from an external device and a CPU can be employed instead of the decode block 1.

  Further, the decode block 1 includes an image data memory unit 13, a transmission data selection unit 14, and a priority determination unit 15 which will be described later. The transmission data selection unit 14 and the priority determination unit 15 are also controlled by the CPU 16.

  The display block 2 is an example of the display unit, and is connected to the decode block 1 via a transmission path and displays an image indicated by the image data. This transmission path has a transmission path capacity capable of transmitting image data of the same size as the image data of the predetermined size at a predetermined frame rate. The transmission path capacity refers to the bit rate that can be transferred, that is, the upper limit of the amount of information that can be transmitted per unit time, and is also referred to as bandwidth.

  In this example, the predetermined size is 2K1K (1920 × 1080 pixels), and the predetermined frame rate is 60 Hz. That is, a 1920 × 1080 pixel frame is transmitted at 60 P (60 Hz progressive image) on this transmission line. Explain that it is the limit. In other words, the decoding unit 12 in this example transmits 1920 × 1080 pixel video (moving image) and OSD image data such as an electronic program guide to the display block 2 side at a maximum of 60 Hz via the transmission path. Has the ability. Of course, these values can be determined to arbitrary fixed values depending on the design of the decoding block 1 and the transmission path.

  The display block 2 includes an image development unit 21, a frame rate conversion unit 22, a scaling unit 23, an image data memory unit 24, a reading unit 25, an image quality adjustment unit 26, a panel control unit 27, and a liquid crystal panel unit 28. Although each part 21-28 in the display block 2 is mentioned later, these are also controlled by CPU16. Therefore, in practice, a control signal (control signal) is transmitted along with the video and still image data through the transmission path. Of course, these transmission paths may be divided without multiplexing.

  Next, details of the decode block 1 will be described. The decode block 1 has a plurality of different sizes having the predetermined size in order to form display target image data having the same size as the number of pixels of the display block 2 (here, the number of pixels that can be displayed on the liquid crystal panel in the liquid crystal panel unit 28). Generate image data. In other words, the display block 2 can be displayed with n times the predetermined size (n is an integer larger than 1). n is not limited to an even number, and may be an odd number. For example, when n = 3, the entire screen may be displayed in three areas of three. However, although a plurality of different image data having the predetermined size is displayed on the liquid crystal panel having n times the number of pixels, the number of image data to be displayed may be different as long as it is n or less. For example, the image data may be displayed only in three areas out of four parts of the entire screen.

  As a main feature of the present invention, the decoding block 1 determines a transmission frame rate (of course, within the predetermined frame rate) for each of the plurality of image data, and time-divides the display target image data. Output to the display block 2. Thus, by generating a plurality of image data and transmitting them to the display block 2 in a time-sharing manner, the transmission path corresponds to the same size as the size (predetermined size) of the image data output from the decode block 1. However, in the display block 2, it is possible to display an integer multiple of the resolution or display with a scaled resolution.

  Here, when at least one of the plurality of pieces of image data is still image data, the decode block 1 determines the transmission frame rate as described above and performs time-division transmission based thereon. By including at least still image data as a component of display target image data, the transmission frame rate can be set to other image data between still images or between moving images and still images in determining the transmission frame rate for each image data. Compared with a certain image data, the effect of improving the image quality can be obtained.

  However, such a determination of the transmission frame rate and time-division transmission based on the determination of the transmission frame rate may be performed even in the case of only moving images. In order to obtain the effect of improving the image quality with only a moving image, it is necessary to accept the deterioration of the smoothness of at least one image data.

  Prior to the description in the case of including a still image, an example in the case of only a moving image will be briefly described. When at least one of the plurality of image data is image data having a different display frame rate from the other image data at the time of input to the decode block 1, the decode block 1 has a transmission frame rate as described above. Determination (that is, determination of a transmission frame rate for each image data) and time division transmission based on the determination may be performed. Here, the display frame rate specified at the time of input to the decode block 1 refers to the display frame rate of the video specified by the input side. For example, 60 fps (60 Hz) for a normal video received as a broadcast wave, etc. For the video input from the recorder or the like to the decode block 1, the display frame rate specified by the recorder is used. For example, in the case of data broadcasting, information such as scroll speed and data update frequency described in, for example, ARIB STD-B24 (version 5.1) “Data broadcasting encoding method and transmission method in digital broadcasting” This display frame rate is specified. In any case, the decode block 1 can determine the display frame rate specified at the time of input. The determination of the transmission frame rate based on the determination of the display frame rate and the time division transmission processing based on the determination are not limited to the case where all of the plurality of image data are moving images, but between still images or between moving images and still images. Even in the case of an image, the display frame rate can be determined and thus can be applied.

  As described above, as a main feature of the present invention, the decode block 1 generates a plurality of different image data having the predetermined size in order to form display target image data having the same size as the number of pixels of the display block 2. The transmission frame rate is determined for each of the generated image data, and the display target image data is output to the display block 2 in a time division manner.

  Hereinafter, a case where at least one of the plurality of pieces of image data is still image data will be described. However, as described above, the present invention is not limited to this case, and the transmission frame rate is set using at least one piece of image data among the plurality of pieces of image data. It is possible to determine the transmission frame rate so as to be different from each other and perform time division transmission based on the transmission frame rate. In addition, not only when at least one of the plurality of image data is still image data, but only accepts deterioration in smoothness of the at least one image data (decrease in display update frequency in the case of still images). Thus, the image quality of other image data can be improved.

  Still image data (graphic data) includes program information included in a broadcast signal and / or OSD image data that can be generated from an image stored in advance in a display device, data of an output image from a PC, a server on the Internet Browsing images and photographic image data obtained by receiving them. As described above, the OSD image data includes image data indicating an electronic program guide and image data of data broadcasting as described above.

  In order to generate a plurality of image data and determine the transmission frame rate, the configuration example of FIG. 3 includes an image data memory unit 13, a transmission data selection unit 14, and a priority determination unit 15.

  In the decode block 1, as illustrated in FIG. 5A, different image data having the predetermined size is stored in each storage area (storage location) divided by the predetermined size in the internal memory 13b. A storage area as a read source is selectively determined so that each data is output at a corresponding transmission frame rate. Examples of the internal memory 13b include a large-scale memory having a capacity functioning as a frame memory, such as a DDR2 SDRAM (Double-Data-Rate2 Synchronous Dynamic Random Access Memory) and a DDR3 (Double-Data-Rate3) SDRAM.

  In order to selectively store image data, the image data memory unit 13 includes a switch (SW) 13 a for switching the output from the decoding unit 12. In addition, in order to selectively output image data in a time-sharing manner at a corresponding transmission frame rate, the image data memory unit 13 has a switch for switching output to the transmission data selection unit 14 according to an instruction from the transmission data selection unit 14 ( SW) 13c. Further, as shown in FIG. 5A, each storage area of the internal memory 13b is displayed on the entire screen of the display block 2 (here, the locations A, B, C, D divided into four crosses). The information indicating the display location is passed from the CPU 16 to the display block 2 when outputting. The number of divisions is a ratio between the number of pixels (display resolution) in the display block 2 and a predetermined size. Therefore, although the following description will be made assuming that the number of screen divisions is 4, the number of divisions is not limited to this.

  Further, here, a configuration example in which the image data memory unit 13 is provided in the decode block 1 is described, but the present invention is not limited to this, and the decode unit is the first to fourth decode units 12a to 12d shown in FIG. A configuration in which a plurality of image data memory units 13 are not provided is also applicable. Note that the number of decoding units is the same as the number of divisions. Of course, in this case, each of the first to fourth decoding units 12a to 12d is provided with a frame memory for decoding. Then, in order to selectively output the image data at a corresponding transmission frame rate in a time division manner, the transmission data selection unit 14 provides a transmission between the first to fourth decoding units 12a to 12d and the transmission data selection unit 14. Is provided with a switch (SW) 13d for switching the output to the transmission data selection unit 14 in response to the instruction.

  As described above, in the configuration example of FIG. 5B, the decode block 1 has the predetermined size in each of a plurality of internal memories (internal memories of the decoding units 12a to 12d) having the capacity of the predetermined size. Different image data is stored, and an internal memory as a read source is selectively determined so that each image data is output at a corresponding transmission frame rate.

  The priority determination unit 15 and the transmission data selection unit 14 will be described. Note that the priority determination unit 15 is provided to determine the transmission frame rate for each of the plurality of image data, but according to the storage area (or the decoding units 12a to 12d) of the internal memory 13b in advance. The transmission frame rate may be determined in advance. If image data to be written in the storage area (or decoded by the decoding units 12a to 12d) is determined in advance, the transmission frame rate for each of the image data can be determined in advance.

  The priority determination unit 15 determines a priority indicating the degree of priority output for each image data. This priority indicates the priority of output at a high frame rate, and among the plurality of image data, image data having a higher priority is output at a higher frame rate than image data having a lower priority. become. Output from the decode block 1 at a high frame rate means that the display block 2 can perform display with higher definition. Therefore, it can be said that the above-described priority indicates the degree to which fine display is preferentially performed.

  Here, the priority determination unit 15 may determine the priority based on whether the image data is moving image data or still image data. That is, the priority determination index may be whether or not the data is moving image data.

  Further, the priority determination unit 15 determines whether the image data is currently a user operation screen (for example, a user operation screen in the electronic program guide or a user operation screen in the data broadcast screen). The priority may be determined. Whether or not it is a user operation screen can be determined, for example, based on whether or not a cursor that changes the display form (shading or the like) according to the operation exists at that location. Of course, the priority determination unit 15 may determine the priority based on both whether the image data is moving image data and whether the image data is currently on the user operation screen. Good. When the cursor location is not used for priority determination, for example, whether or not the display location is located on the upper left side may be used for priority determination. The priority may be determined as a priority order of a plurality of image data.

  The transmission data selection unit (also referred to as output data selection unit) 14 determines a transmission frame rate according to the priority determined by the priority determination unit 15 for each image data, and according to the determined transmission frame rate, Select the source of image data to be output. This selection is as described for the switch 13c and the switch 13d. In this way, the transmission data selection unit 14 selects image data to be transmitted in accordance with an instruction designating the priority from the priority determination unit 15 and transmits (outputs) it to the display block 2 side.

  Next, the details of the display block 2 that receives the image data transmitted in time division in this way will be described. The image developing unit 21 receives OSD image data such as 1920 × 1080 pixel video and electronic program guide transmitted from the transmission data selecting unit 14, and the received image data is converted into a frame rate converting unit 22 and an image data memory unit. Expand to 24. The data is transmitted from the decode block 1 to the display block 2 via a transmission path in a format such as TMDS (Transition Minimized Differential Signaling), and the image development unit 21 converts the data into parallel data that can be processed in units of pixels. And then output to the subsequent stage.

  When displaying a moving image on the entire screen, that is, when displaying a single screen image, the image development unit 21 outputs the moving image data to the frame rate conversion unit 22 as shown by a path A in FIG. . The frame rate conversion unit 22 performs frame rate conversion on the moving image data output from the image development unit 21 and passes the converted data to the scaling unit 23. The frame rate conversion method includes various methods such as a method of simply reading the same frame repeatedly a plurality of times and a method of performing frame interpolation by linear interpolation between frames (linear interpolation). This frame rate conversion can improve motion blur in a hold-type display method like a liquid crystal panel.

  In this configuration example, a Full HD system is applied, and the frame rate conversion unit 22 has the processing capacity of one Full HD system. However, the frame rate conversion unit 22 can be easily used for a high-definition display device as combined with the 4K2K liquid crystal panel unit 28. However, for example, when it is desired to fit two screens of video into the electronic program guide and to create an interpolation frame in the video, the frame rate conversion unit 22 is required for two Full HD systems.

  The scaling unit 23 scales the 1920 × 1080 (Full HD) data after frame rate conversion into data of 3980 × 2160 pixels and outputs the data to the image quality adjustment unit 26. In this way, in the case of a one-screen video display, moving image data passes through path A, an interpolated frame is created by the frame rate conversion unit 22, scaled to the display size by the scaling unit 23, and sent to the image quality adjustment unit 26. Sent. It is also possible to adopt a configuration in which frame rate conversion for single-screen display is executed after scaling by the scaling unit 23. It should be noted that if the motion blur of a still image such as an electronic program guide is not minded, a configuration in which frame rate conversion is executed after image quality adjustment by the image quality adjustment unit 26 can be employed.

  In addition, since the scaling is performed, the transmission data selection unit 14 on the decode block 1 side transmits the frame rates of 50P, 30P, 24P, etc., which are general-purpose frame rates so that the frame rate conversion unit 22 can easily process them. It is preferable. Therefore, it is preferable that the priority determination unit 15 determines the frame rate by selecting from 60P, 50P, 30P, and 24P in the case of moving image data in consideration of the frame rate conversion in the frame rate conversion unit 22. .

  Thus, when the image data is moving image data, the decode block 1 preferably selects and determines the transmission frame rate from a plurality of predetermined values. In addition, when the display device can be switched from a plurality of modes related to video processing (for example, storefront mode, animation mode, movie mode, etc.), the selection decision is made according to the currently selected mode. The transmission frame rate may be determined. For example, in the movie mode, 24P may be selected.

  On the other hand, when displaying an image including at least a still image, the image development unit 21 directly outputs the still image data to the image data memory unit 24 as indicated by a path C in FIG. This is because a still image does not need to create an interpolation frame by interpolation frame interpolation or the like, and there is no problem if an image on a memory is displayed. When a moving image is included as well as a still image, the image development unit 21 outputs the moving image data to the frame rate conversion unit 22 and then outputs the moving image data to the image data memory unit 24 as shown by a path B in FIG. To do. Regardless of the route B or C, since scaling is not performed on still images such as electronic program guides and data broadcasting, character blur due to scaling does not occur for still images.

  The image data memory unit 24 is a frame memory that temporarily stores still image data (and moving image data) output from the image development unit 21 (and the frame rate conversion unit 22). As the image data memory unit 24, similarly to the image data memory unit 13, a large-scale memory functioning as a frame memory can be applied. The readout unit 25 reads out the 3980 × 2160 pixel data in accordance with the display frame rate and sends the data to the image quality adjustment unit 26.

  The image quality adjustment unit 26 performs optimum image quality adjustment on the moving image data scaled by the scaling unit 23 and the still image data (and moving image data) read by the reading unit 25, and the panel control unit 27 send. The panel control unit 27 performs control to display the image data after the image quality adjustment by the image quality adjustment unit 26 on the liquid crystal panel unit 28.

Next, a specific processing example in the priority determination unit 15 will be described with reference to FIGS.
First, a processing example will be described along the flow of FIGS. 6 is a flowchart for explaining an example of processing in the decoding block of FIG. 3, and FIG. 7 is a flowchart following FIG. In the following description, an example is given in which the priority is represented by two levels of “high”, “medium”, and “low”. There may be. In addition, priority assignment (which priority is determined in which case) is not limited to the example described here.

  The priority determination unit 15 first determines whether or not the display device setting (setting determined by a user operation or the like) is currently in the high-definition mode (step S1), and if it is not in the high-definition mode (in the case of NO), Without performing the time division process, the image data is written to one storage location of the internal memory 13b, and the transmission data selection unit 14 selects the storage location and outputs it to the display block 2 side (step S10). In this case, whether the image data is a moving image or a still image such as an electronic program guide, the image data is displayed on the liquid crystal panel unit 28 through the path A in the display block 2, subjected to frame rate conversion and scaling. Will be.

  On the other hand, when the mode is the high-definition mode (in the case of YES in step S1), the priority determination unit 15 determines whether or not there is a change in the configuration of the display location or the cursor location (which display location has the cursor). Detection is performed based on an operation signal received from the operation unit (not shown) received by the CPU 16 (step S2). Then, the process waits until there is a change, and when YES is obtained in step S2, the display locations A, B, C, D (more precisely, the storage locations in the internal memory 13b or the decoding units 12a to 12d corresponding to the display locations) ) In order (step S3). Note that step S3 means that steps S4 to S9 in FIG. 6 and steps S11 to 14 in FIG. 7 are processed while sequentially selecting processing targets from all display locations.

  First, in step S4, the priority determination unit 15 determines whether or not N (any one of display locations A, B, C, and D. The same applies hereinafter) is a video (moving image). If “YES” in the step S4, it is determined whether or not the video is one screen among divided areas (areas corresponding to the respective display locations) of the entire screen (step S5). This determination may also be performed based on the operation signal received by the priority determination unit 15 by the CPU 16.

  If YES in step S5, that is, if the video is one screen, the priority determining unit 15 determines the priority to be “high” and determines to transmit the transmission frame rate at, for example, 50P (step S6). In this example, the number of frames that can be transmitted on the transmission line per second is 60 frames, and it is determined that 50 frames are used for transmission of this video. The reason for the 50P is that the frame rate converter (FRC) 22 in the subsequent stage is taken into account, and may be 60P, for example, or a transmission that deserves high priority such as a value close to 60P. What is necessary is just to set as a frame rate.

  Subsequent to step S6, the CPU 16 obtains information indicating the transmission frame rate from the priority determination unit 15, and displays information indicating the display location (in this case, information indicating display on the entire screen) on the display block 2 side. It transmits as a control signal and contacts (step S7). In addition, information indicating that it is moving image data is included in this control signal to inform that the display block 2 is subject to frame rate conversion and scaling.

  If NO in step S5, that is, if the video has multiple screens, the priority determination unit 15 determines the priority to be “high” and determines that the transmission frame rate is transmitted at, for example, 24P (step S8). In this example, two-screen display is assumed, and it is determined that 24 frames for each sub-screen out of the number of frames (60 frames) that can be transmitted on the transmission path per second are used for transmission of this video. The reason for 24P is that the frame rate conversion unit 22 in the subsequent stage is taken into account, and may be, for example, 30P or the like. In the case of two screens, the priority is “high” such as a value close to 30P, which is half of 60P. The transmission frame rate deserves to be determined.

  Subsequent to step S8, the CPU 16 obtains information indicating the transmission frame rate from the priority determination unit 15, and information indicating the display location (in this case, information indicating display on the right screen or the left screen, or the upper screen or Along with the information indicating the display on the lower screen), it is transmitted as a control signal to the display block 2 side to make contact (step S9). In addition, information indicating that it is moving image data is included in this control signal to inform that the display block 2 is subject to frame rate conversion and scaling.

  In the case of NO in step S4, that is, when displaying a still image instead of a moving image at the display location to be determined, the priority determination unit 15 first determines whether the still image is an electronic program guide or not. The determination is made based on the operation signal received in step S11 in FIG. In addition, when it is a part of the electronic program guide, that is, when one electronic program guide is constituted by a plurality of display locations, YES is determined in step S11.

  In the case of NO in step S11, that is, when a still image other than the electronic program guide is displayed at the determination target display location, the priority determining unit 15 determines that the priority is “low”, and the priority is “high” from 60P. It is determined that the number of frames that is obtained by subtracting the number of frames used for the display location and the number of frames used for the display location of medium priority is used (step S14). That is, when the priority is “low”, the remainder of the 60 frames determined by the transmission path capacity is used for the number of frames at the display place with the higher priority. The larger the number of frames at the display place with the higher priority, the smaller the number of frames that can be used at the display place with the low priority.

  In addition, since it is not necessary to interpolate a still image such as an electronic program guide with an interpolated frame in the display block 2, it is not necessary to notify the transmission frame rate after the processing of step S14, but the communication of the display location is basically not shown. (If the relationship between the storage location and the display location is not determined in advance). Further, the control information at this time also includes information indicating that it is still image data, and informs the display block 2 that it is not a target for frame rate conversion and scaling. Of course, if a rule that includes information indicating that in the case of moving image data is included in the control signal, information indicating that it is still image data is unnecessary in the case of still image data. The reverse is also true.

  As described in steps S <b> 7, S <b> 9 and the like, the decode block 1 may transmit information indicating the display location and the transmission frame rate in the display block 2 to the display block 2 for each image data. However, when the image data is a still image, since frame rate conversion is not performed, information indicating the transmission frame rate may not be transmitted.

  If YES in step S11, the priority determination unit 15 determines whether or not the cursor is at this display location based on the operation signal received by the CPU 16 (step S12).

  In the case of NO in step S12, that is, when displaying a still image of the electronic program guide without the cursor at the display location to be determined, the process proceeds to step S14, and the priority determination unit 15 determines that the priority is “low”. The transmission frame rate (the number of frames per second) is determined accordingly.

  In the case of YES in step S12, that is, when the still image of the electronic program guide is displayed at the display location to be determined, the priority determination unit 15 determines that the priority is “medium” and the priority is “high” from 60P. It is determined to use the number of frames obtained by subtracting the number of frames used for the display location (step S13). In other words, even when the priority is “medium”, out of the 60 frames determined by the transmission path capacity, the remainder used for the number of frames at the display location with the priority “high” is used. As the number of frames at a display place with a higher priority increases, the number of frames that can be used at a display place with a medium priority is adjusted to be smaller. Even after the processing in step S13, the transmission frame rate is not required to be communicated, as in the case after the processing in step S14. However, as described above, information indicating the display location and still image data is basically necessary. is there.

  As described above, the priority determination unit 15 updates the determination of the transmission frame rate each time a related operation signal is transmitted from the CPU 16, as described in the subsequent processing according to the determinations in steps S <b> 1 and S <b> 2. The definition of the location will be adjusted.

  Although simplified in the flow of FIGS. 6 and 7, for example, the following transmission frame rate allocation method can be applied. If the cursor is present after the determination of the presence / absence of the cursor, half of the number of frames not yet used can be used. 6 and FIG. 7, when the video is determined during the loop, the transmission frame rate of the other display location is initialized, and the determined location is set to the high priority and the other transmission is performed. Reset the frame rate. When one or two of the display locations A to D are included, the remaining transmission frame rate of the video is used as the display location of the electronic program guide accordingly. For example, if only the display location D is a video, the process starts from the location A, but since there is information that one is a video in advance, when 50P is used for the video, the location A includes 10P. A frame rate may be assigned.

  According to the processing examples of FIGS. 6 and 7, for example, when there are a moving image and three still images and the cursor is on one of the still images, 50P is displayed for the moving image display location, and 8P is displayed for the still image display location with the cursor. The transmission rate of each image data, such as 1P, is determined for the display positions of two still images without a cursor, and each image data is transmitted in a time-sharing manner accordingly.

  Further, according to the processing examples of FIGS. 6 and 7, for example, when displaying one still image with a cursor, one still image without a cursor, and two moving images in four divisions, Transmission is performed at 10P for the display location, 2P for the display location of the still image without the cursor, and 24P for the two display locations of the moving image.

  With reference to FIGS. 8 to 14, the display location on the screen in the liquid crystal panel unit 28 and the transmission by time division of the image data to be displayed at each display location will be described in detail. 8 is a diagram for explaining an example of the relationship between a frame transmitted from the decoding block in FIG. 3 and a display screen for displaying the frame in the display block in FIG. 4. FIG. It is a figure for demonstrating the transmission timing of this frame. Moreover, FIGS. 10-13 is a figure for demonstrating the other example of said relationship.

  As an example, regarding the display locations A to D on the liquid crystal panel unit 28 shown in FIG. 8B, “location A” is a video (moving image), “location B” is an electronic program guide with a cursor, “location C” The case where an electronic program guide without a cursor is displayed at “Location D” will be described.

  First, a signal received from the outside by the tuner unit 11 is decoded by the decoding unit 12 and restored to a still image such as an actual video (moving image) or an electronic program guide. Still image data is written in an area corresponding to the display location in the storage area of the internal memory 13b of the image data memory unit 13 (or the internal memory of the decoding units 12a to 12d). In the configuration example of FIG. 5A, the decoding unit 12 draws a Full HD moving image at 60P in the storage location A of the internal memory 13b, and stores each area of the electronic program guide in the storage locations B, C, and D. Draw a Full HD still image. The storage locations A to D correspond to the display locations A to D in FIG. 8B, respectively. The storage locations B, C, and D are updated by receiving an operation signal that must be reflected in the drawing of the still image. This update includes updating the cursor location.

  Then, the priority determination unit 15 has, for example, 30P of image data (moving image data) to be displayed at the display location A, 20P of image data (still image data with a cursor) to be displayed at the display location B, the display location C, Assume that the image data to be displayed on D (still image data and no cursor) is 5P obtained by equally dividing the remaining 10P, and the transmission frame rate of each image data is determined based on the priority.

  In that case, the transmission data selection unit 14 puts the frame of the display place A every 2/60 seconds, for example, in the transmission order as shown in FIG. Frame B is inserted every 3/60 seconds, frame at display location C is inserted every 12/60 seconds, frame at display location D is also inserted every 12/60 seconds, and the frames do not overlap. What is necessary is just to carry out time division transmission in the order arrange | positioned by series. The transmission order of the display locations A to D may be determined in advance such that the display locations are in the order of the frames corresponding to the upper left, upper right, lower left, and lower right. Such a state of time division transmission is also illustrated in FIG. 9 as a timing chart in a transfer / non-transfer state. In FIG. 9, High represents a transfer state, and Low represents a rest (non-transfer) state.

  In this way, each image data transmitted in a time-division manner is developed for the display location A by the image development unit 21 to the frame rate conversion unit 22, and after the interpolation frame is generated by the frame rate conversion unit 22, the image data The data memory unit 24 is expanded in a storage area corresponding to the display location, and the display locations B, C, and D are directly expanded in the corresponding storage region in the image data memory unit 24. Thereby, in the liquid crystal panel unit 28, the video (moving image) is displayed at “place A”, the electronic program guide is displayed at “place B”, “place C”, and “place D”, and the cursor is placed at “place B”. A certain display is made.

  Here, the transmission frame rates for locations A, B, C, and D are 30P, 20P, 5P, and 5P, respectively. For still images, the same data will be transmitted from the decode block 1 unless it is updated, and the reflection of the updates for locations B, C, and D will also be transmitted at a transmission frame rate of 20P, 5P, and 5P, respectively. Made at the timing. In particular, the data of the still image of “place B” where the cursor is present is reflected in the display at the update speed four times that of “place C” and “place D” where the cursor does not exist. The reflection on the display can be made quickly.

  Another example of the relationship between the frame transmitted from the decode block 1 and the display screen for displaying the frame in the display block 2 will be described with reference to FIGS.

  In FIG. 10A, the display target image data of 3840 × 2160 pixels is one electronic so as to illustrate the transmission order for setting the display state on the display screen of the liquid crystal panel unit 28 shown in FIG. Even when the program table is composed of four partial still images (one is 1920 × 1080 pixels) or four electronic program tables (one is 1920 × 1080 pixels), the transmission frame rate for image data corresponding to each display location To decide. In this example, for example, 60P can be equally allocated and determined to be 15P. In this case, the image data is arranged at 1/60 second intervals, and the transmission interval of image data at the same display location is arranged at 4/60 second intervals and transmitted. In the case where the priority determination unit 15 is provided, all are determined to have the same priority in this example. In this case, since all are electronic program guides, it is not necessary to communicate the transmission frame rate to the display block 2.

  Thus, in the liquid crystal panel unit 28, partial still images of the electronic program guide (“program guide 1”, “program guide 1”, “upper right display location, upper right display location, lower left display location, and lower right display location, respectively, are displayed. Program guide 2 "," Program guide 3 "," Program guide 4 ") are displayed.

  In FIG. 11A, the display target image data of 3840 × 2160 pixels is one electronic so as to illustrate the transmission order for setting the display state on the display screen of the liquid crystal panel unit 28 shown in FIG. Even when the cursor 28a is displayed at the display location at the upper left of the screen, the transmission frame rate is determined for the image data corresponding to each display location, consisting of four partial still images or four electronic program guides in the program guide. To do. In this example, for example, it is possible to determine 30P for the image data of “program guide 1” corresponding to the display location at the upper left of the screen and 10P for the remaining image data. Then, the image data of “program guide 1” is arranged at 1/30 second intervals, and the remaining image data is sequentially arranged at intervals of 1/30 seconds and transmitted. In this case, since all are electronic program guides, it is not necessary to communicate the transmission frame rate to the display block 2.

  As a result, in the liquid crystal panel unit 28, “program guide 1”, which is a partial still image of the electronic program guide with the cursor 28 a, is displayed at a high update frequency in the upper left display location, the upper right display location and the lower left display location. Partial still images of the electronic program guide (“program guide 2”, “program guide 3”, and “program guide 4”) are displayed at the display location and the display location at the lower right.

  In FIG. 12A, the display target image data of 3840 × 2160 pixels is one moving image so as to exemplify the transmission order for setting the display state on the display screen of the liquid crystal panel unit 28 shown in FIG. Even in the case of an image and three partial still images in one electronic program guide or three electronic program guides, the transmission frame rate is determined for image data corresponding to each display location. In this example, for example, the image data of “video” corresponding to the display location at the upper left of the screen can be determined to be 30P, and the remaining image data can be determined to be 10P. Then, image data of “video” is arranged at 1/30 second intervals, and the remaining image data is sequentially arranged at intervals of 1/30 seconds and transmitted.

  Thereby, in the liquid crystal panel unit 28, “video” is displayed at the upper left display location, and the partial still images of the electronic program guide are displayed at the upper right display location, the lower left display location, and the lower right display location (respectively “ Program guide 1 ”,“ Program guide 2 ”,“ Program guide 3 ”) are displayed.

  In FIG. 13A, the display target image data of 3840 × 2160 pixels is one electronic so as to illustrate the transmission order for setting the display state on the display screen of the liquid crystal panel unit 28 shown in FIG. Even in the case of two partial still images or two electronic program guides in the program guide and two moving images, the transmission frame rate is determined for the image data corresponding to each display location. In this example, for example, the image data of “Video 1” corresponding to the display location on the lower left of the screen and the image data of “Video 2” corresponding to the display location on the lower right are 24P, and 6P for the remaining image data. Can be determined. Each image data includes, for example, “video 1”, “video 2”, “video 1”, “video 2”, “program guide 1”,..., “Video 1”, “video 2”, “video” 1 ”,“ Video 2 ”,“ Video 1 ”,“ Program Guide 2 ”are arranged and transmitted.

  Thereby, in the liquid crystal panel unit 28, “program guide 1” is displayed at the upper left display location, “program guide 2” is displayed at the upper right display location, and “video 1” is displayed at the lower left display location. “Video 2” is displayed at the lower right display location.

  In addition, an example is shown in which all frames per second are allocated (that is, when the transmission frame rate is 60P when considering the frames at all display locations). It is not necessary to use the total number of frames (60 frames in the above example) by opening them.

  In the above description, basically, a case where a moving image and a still image such as an electronic program guide are not superimposed (overlaid) has been described. However, as an application example, another image data memory unit 24 is provided, By writing the scaling result of the scaling unit 23 into the added image data memory unit 24 and providing a function for overlaying by the reading unit 25, it is also possible to display a moving image and a still image as an overlay display. Thus, for example, when displaying an electronic program guide, it is possible to display a program video being viewed or a selected program video on a part of the electronic program guide.

  As described above, the display device according to the present invention makes the best use of the high-resolution display panel in a limited transmission path capacity such as when the transmission path connecting the transmission side and the display side is less than the display resolution. Display can be performed. Therefore, for example, when transmitting a plurality of 2K1K-size image data including still image data, a high-definition (high-definition) image of 4K2K size is output because transmission is performed at a high transmission frame rate as necessary. be able to. In particular, not only can an electronic program guide and data broadcast display with a large amount of information of 4K2K size be provided to the user, but the transmission frame rate is changed according to the image data, so that the amount of information can be increased depending on the image data. . For example, it is possible to present an image of a cursor location where the user may check details in higher quality.

  In the present invention, 2K1K size graphic data (and moving image data, that is, main video data) is displayed on a 4K2K size display panel as an example. For example, 2K1K size graphic data ( And main video data) or 2K1K size video data is displayed on a 16K8K size display panel, 4K2K size graphic data (and main video data) or 4K2K size video data is displayed on an 8K4K size display panel. The same applies to the case where 4K2K size graphic data (and main video data) or 4K2K size video data is displayed on a 16K8K size display panel.

DESCRIPTION OF SYMBOLS 1 ... Decoding block, 2 ... Display block, 11 ... Tuner part, 12 ... Decoding part, 12a ... 1st decoding part, 12b ... 2nd decoding part, 12c ... 3rd decoding part, 12d ... 4th decoding part, 13 ... Image data memory unit, 13b ... Internal memory, 13c ... Switch, 13d ... Switch, 14 ... Transmission data selection unit, 15 ... Priority determination unit, 16 ... CPU, 21 ... Image development unit, 22 ... Frame rate conversion unit, 23 ... Scaling unit, 24... Image data memory unit, 25... Readout unit, 26... Image quality adjustment unit, 27.

Claims (7)

A display device comprising: an output unit that outputs image data of a predetermined size to a transmission line; and a display unit that is connected to the output unit via the transmission line and displays an image indicated by the image data,
The transmission path has a transmission path capacity capable of transmitting image data of the same size as the image data of the predetermined size at a predetermined frame rate,
The output unit generates a plurality of different image data having the predetermined size to form display target image data having the same size as the number of pixels of the display unit, and for each of the generated plurality of image data And determining the transmission frame rate and outputting the display target image data to the display unit in a time-sharing manner.   When at least one of the plurality of generated image data is still image data, the output unit determines a transmission frame rate for each of the plurality of image data, and outputs the display target image data as time. The display device according to claim 1, wherein the display is divided and output to the display unit.   The output unit, when at least one of the plurality of generated image data is image data having a display frame rate specified at the time of input to the output unit different from other image data, each of the plurality of image data The display device according to claim 1, wherein a transmission frame rate is determined for the display target image data and the display target image data is output to the display unit in a time division manner.   The output unit, for each image data, according to the priority determined by the priority determination unit for determining the priority indicating the degree of output preferentially, and the priority determined by the priority determination unit for each image data The output data selection part which determines the said transmission frame rate and selects the reading source of the said image data of output object according to the determined said transmission frame rate, The any one of Claims 1-3 characterized by the above-mentioned. The display device according to item.   The priority determination unit is based on whether the image data is moving image data or still image data, and / or based on whether the image data is currently on a user operation screen, The display device according to claim 4, wherein the priority is determined.   The said output part transmits the information which shows the display place and the said transmission frame rate in the said display part with respect to the said display part for every said image data, The any one of Claims 1-5 characterized by the above-mentioned. The display device described in 1.   7. The output unit according to claim 1, wherein when the image data is moving image data, the output unit selects and determines the transmission frame rate from a plurality of predetermined values. The display device according to any one of the above.

Images