Display control device, image display system, and display control method

Abstract

To provide a display control device capable of suppressing power consumption.SOLUTION: A display control device 20 causes a multi-display 10 in which a plurality of display panels 100 are arrayed to display an overall image by displaying partial images on each of display panels for the plurality of display panels 100. The display control device 20 includes an image analysis unit 22 and a switching signal generation unit 23. The image analysis unit 22 analyzes partial image signals input to each of the plurality of display panels 100, and determines, for each of the plurality of display panels 100, a timing to switch an operation mode from a first power mode to a second power mode having lower power consumption than the first power mode. The switching signal generation unit 23 generates a switching signal to switch the operation mode from the first power mode to the second power mode according to the determined timing for each of the plurality of display panels 100.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a display control device, a video display system, and a display control method. [Background technology]

[0002] 2. Description of the Related Art Multi-display systems are known in the art, in which a plurality of displays are arranged side by side to form a large screen.

[0003] Patent Document 1 discloses a multi-display having a plurality of displays each equipped with a control module and a computing module. The control modules and computing modules of the displays are connected in series based on a predetermined connection rule. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2003-44028 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, in such a multi-display system, even if the entire screen of one of the displays constituting the multi-display is in black display, the same amount of power is required as if the entire screen were to display something other than black.

[0006] The present invention has been made in view of the above-mentioned problems, and has an object to provide a display control device, a video display system, and a display control method that are capable of reducing power consumption. [Means for solving the problem]

[0007] A display control device according to the present invention displays an entire image on a multi-display formed by an arrangement of a plurality of display panels by causing each of the plurality of display panels to display a partial image. The display control device includes a video analysis unit and a switching signal generation unit. The video analysis unit analyzes partial video signals input to each of the plurality of display panels to determine, for each of the plurality of display panels, a timing for switching the operating mode from a first power mode to a second power mode that consumes less power than the first power mode. The switching signal generation unit generates a switching signal for each of the plurality of display panels to switch the operating mode from the first power mode to the second power mode in accordance with the determined timing.

[0008] A video display system according to the present invention includes the above-mentioned display control device and a plurality of the display panels.

[0009] The display control method of the present invention is a display control method executed by a display control device that displays an entire image on a multi-display formed by an arrangement of multiple display panels by displaying a partial image on each of the multiple display panels, and includes a step of determining, by analyzing the partial image signals input to each of the multiple display panels, a timing for switching the operating mode from a first power mode to a second power mode that consumes less power than the first power mode, for each of the multiple display panels, and a step of generating a switching signal for switching the operating mode from the first power mode to the second power mode in accordance with the determined timing, for each of the multiple display panels. Effect of the Invention

[0010] According to the present invention, power consumption can be reduced. [Brief description of the drawings]

[0011] [Figure 1] 1 is a diagram showing a configuration of a video display system according to a first embodiment. [Diagram 2]1 is a diagram showing an example of a display form of an entire image in the image display system according to the first embodiment. FIG. [Diagram 3] FIG. 4 is a flowchart showing a first example of a display process in the video display system of the first embodiment. [Figure 4] FIG. 11 is a flowchart showing a second example of the display process in the video display system of the first embodiment. [Diagram 5] FIG. 11 is a diagram showing the configuration of a video display system according to a second embodiment. [Figure 6] FIG. 11 is a flowchart showing a display process in a video display system according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] First Embodiment Hereinafter, an embodiment of a video display system according to the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and description thereof will not be repeated.

[0013] (1) Configuration of video display system 1 Fig. 1 is a diagram showing the configuration of an image display system 1 according to this embodiment. Specifically, Fig. 1 shows a schematic diagram of a multi-display 10 and a block diagram of a display control device 20. As shown in Fig. 1, the image display system 1 includes the multi-display 10 and the display control device 20.

[0014] The multi-display 10 includes a plurality of display panels 100. The display panels 100 are, for example, direct-illumination type liquid crystal displays. The display panels 100 include a liquid crystal panel and a backlight. The display panels 100 may be edge-lit liquid crystal displays.

[0015] In this embodiment, the multi-display 10 is configured by arranging four display panels 100. The four display panels 100 include a first display panel 100A, a second display panel 100B, a third display panel 100C, and a fourth display panel 100D. In this specification, the first display panel 100A to the fourth display panel 100D may be collectively referred to as "display panels 100." A partial image is displayed on the display screen of each of the first display panel 100A to the fourth display panel 100D, thereby displaying an entire image on the multi-display 10.

[0016] The first to fourth display panels 100A to 100D all have the same display performance and the same size. The number of display panels 100 constituting the multi-display 10 may be two, three, five or more.

[0017] As shown in FIG. 1, the display control device 20 includes a video input unit 21, a video analysis unit 22, a switching signal generation unit 23, a memory 24, a storage 25, and a display control unit .

[0018] A video signal indicating a partial video to be displayed on each of the multiple display panels 100 is input to the video input unit 21. In the following description, the video signal indicating the partial video will be referred to as a partial video signal. In one example, the partial video signal is a signal conforming to the PQ (Perceptual Quantization) method. The partial video signal may also include standard data indicating the standard of the video signal. The partial video signal includes information for identifying the display panel 100 to which it is input.

[0019] The video analysis unit 22 analyzes the partial video signals input to each of the multiple display panels 100. By analyzing the partial video signals, the video analysis unit 22 determines the timing for switching the operation mode for each of the multiple display panels 100. In the following description, the timing for switching the operation mode between the first power mode and the second power mode is referred to as switching timing.

[0020] Here, we will explain the operation modes of the display panel 100. The display panel 100 has at least the following two operation modes. First power mode: An operation mode used for displaying a partial image. Second power mode: An operating mode that consumes less power than the first power mode.

[0021] Specifically, the second power mode is an operation mode in which the luminance of the backlight of the display panel 100 is uniformly reduced across the entire screen of the display panel 100. The second power mode includes an operation mode in which the backlight is turned off. Therefore, by switching to the second power mode, the power consumption of the display panel 100 can be reduced.

[0022] The video analysis unit 22 then determines the timing at which the entire screen of one of the display panels 100 included in the multi-display 10 becomes black display as the switching timing for the one of the display panels 100. As a result, it is possible to determine an appropriate timing for reducing the luminance of the backlight in the display panel 100. Here, black display refers to a state in which the entire screen is displayed black because the image output by the display panel 100 has a chroma and brightness below a certain threshold value. In general, the brightness of the screen is caused by the luminance of the backlight, and the chroma of the screen is caused by the orientation of liquid crystal molecules in the liquid crystal panel.

[0023] The video analysis unit 22 determines the start time and end time of the second power mode as the switching timing, and generates a time table indicating the start time and end time. As a result, the switching signal generation unit 23 can easily generate switching signals at the start time and end time by referring to the time table. The video analysis unit 22 may determine the start time and end time based on the response characteristics of each display panel 100 when each display panel 100 returns from the second power mode. This process will be described in detail below.

[0024] First, in a state in which the backlight of the display panel 100 is always ON, the response characteristics of the screen transition in the display panel 100 are affected by the following factors. · Response speed of liquid crystal molecules: The higher the response speed when controlling the arrangement of liquid crystal molecules in the liquid crystal panel, the more quickly images can be switched. · Performance of the LCD panel's drive circuit: If the drive circuit that sends signals to control the arrangement of liquid crystal molecules has high performance, images will switch smoothly.

[0025] On the other hand, when the backlight is switched ON / OFF due to a change in the operation mode of the display panel 100, the following factors affect the response characteristics of the screen transition. Backlight response speed

[0026] That is, when a screen transition is performed by switching the backlight ON / OFF, the response characteristics are different from those of a screen transition caused by changing the polarization of liquid crystal molecules in a liquid crystal panel. Therefore, the image analysis unit 22 determines the switching timing taking into account the difference in response characteristics.

[0027] Specifically, the video analysis unit 22 sets the end time of the second power mode to a timing earlier than the timing at which the screen should transition from black to white in the partial video, for example. As a result, the display control device 20 can suppress a delay in screen transition caused by the difference between the response speed of the display panel 100 and the response speed of the backlight.

[0028] The switching signal generation unit 23 generates a switching signal for switching the operation mode from the first power mode to the second power mode and a switching signal for switching from the second power mode to the first power mode, for each of the multiple display panels 100, in accordance with the switching timing determined by the video analysis unit 22. The switching signal is a signal related to power control input to a backlight drive circuit, and is a signal for switching the operation mode of the display panel 100 between the first power mode and the second power mode.

[0029] The memory 24 temporarily stores programs, data to be processed by the programs, etc. The memory 24 is a volatile storage module such as a DRAM (Dynamic Random Access Memory).

[0030] The memory 24 can also function as a buffer that temporarily stores the partial video signal to be input to the display panel 100. In this case, while the memory 24 is temporarily storing the partial video signal, the video analysis unit 22 analyzes the partial video signal stored in the memory 24 to determine the switching timing. This process will be described in detail later.

[0031] The storage 25 includes a main storage device and an auxiliary storage device. The main storage device is, for example, a semiconductor memory. The auxiliary storage device is, for example, a semiconductor memory and / or a hard disk drive. The storage 25 may include removable media. The storage 25 corresponds to an example of a non-transitory computer-readable storage medium.

[0032] The storage 25 stores a computer program that defines the procedures of the processes to be executed by the display control device 20. The display control device 20 operates according to the procedures defined in the computer program stored in the storage 25.

[0033] The storage 25 may function as a storage unit that non-time-limitedly stores the partial video signal received by the video input unit 21. In this case, the partial video signal is stored in the storage 25 together with information for identifying the display panel 100 to which it is input. This allows the video analysis unit 22 to analyze the partial video signal stored in the storage 25, thereby determining the switching timing in advance prior to inputting the partial video signal to the display panel 100. Details of this process will be described later.

[0034] The display control unit 26 controls the image display by the display panel 100 based on the partial video signal and the switching signal. The display control unit 26 controls the liquid crystal panel of the corresponding display panel 100 by inputting the partial video signal to the display panel 100 set as the input destination. The display control unit 26 also controls the brightness of the backlight of the corresponding display panel 100 by inputting the switching signal to the corresponding display panel 100.

[0035] The video analysis unit 22, the switching signal generation unit 23, and the display control unit 26 each fulfill their functions by the processor executing a computer program stored in the storage 25. In one example, the processor includes an Application Specific Integrated Circuit (ASIC). The processor may include a central processing unit (CPU). The processor executes the computer program stored in the storage 25 to realize the functions of the video analysis unit 22, the switching signal generation unit 23, and the display control unit 26.

[0036] Next, a description will be given of a display mode of an overall image in the video display system 1. Fig. 2 is a diagram showing an example of a display mode of an overall image in the video display system 1. As shown in Fig. 2, the video display system 1 displays one overall image on the entire multi-display 10 by using partial images displayed on multiple display panels 100.

[0037] The overall image may change over time. In the illustrated example, an overall image that changes from pattern A, through pattern B, to pattern C is displayed repeatedly at a fixed cycle. This display mode of displaying the overall image is used, for example, in digital signage that transmits various advertisements on multi-displays 10 installed in various commercial facilities or public transportation facilities.

[0038] 2, a video signal of any color other than black is displayed on each of the multiple display panels 100 in the multi-display 10. In patterns A and B, the operation mode of each display panel 100 is the first power mode.

[0039] In pattern C shown in the lower part of FIG. 2, the upper left first display panel 100A displays black on its entire surface. That is, the video signal of the first display panel 100A is black. In this case, the video display system 1 displays black by uniformly lowering the luminance of the backlight of the display panel 100 without controlling the orientation of the liquid crystal molecules in the liquid crystal panel. That is, in the state of pattern C, the operation mode of the first display panel 100A is the second power mode. For the other display panels 100, that is, the display panels 100 that do not display black on their entire surface, the video signal is other than black and the operation mode is the first power mode.

[0040] That is, in a typical liquid crystal display, even if the entire screen is displayed in black, a certain amount of power is consumed due to the following background. - Because it supplies power to drive the backlight The backlight is in standby mode to display the subsequent video signal. To keep the backlight brightness constant so that it can be turned on at any brightness according to the received partial video signal.

[0041] On the other hand, in the video display system 1 of the present invention, the timing at which the entire display panel 100 displays black is analyzed for the partial video signal for each display panel 100, and the backlight brightness is uniformly reduced to achieve black display, thereby reducing power consumption.

[0042] (2) Display processing by the video display system 1 The display process performed by the video display system 1 will now be described in detail.

[0043] (2-1) First Example of Display Processing by Video Display System 1 3 is a flow diagram showing a first example of a display process in the video display system 1. In this process, when the same partial video is repeatedly distributed at a fixed cycle, the switching timing is determined while the input partial video signal is being displayed.

[0044] 3, in the display process according to the first example, first, the display control device 20 receives an input of a partial video signal (step S101). Specifically, the video input unit 21 of the display control device 20 receives an input of a partial video signal prepared for each display panel 100. The partial video signal is stored in the storage 25.

[0045] The display control device 20 performs display control based on the partial video signal received by the video input unit 21 (step S102). Specifically, the display control unit 26 of the display control device 20 reads the partial video signal stored in the storage 25 and outputs it to the display panel 100. At this time, the display control unit 26 outputs the corresponding partial video signal to each of the multiple display panels 100.

[0046] In response to the output of the partial video signal by the display control unit 26, the display panel 100 performs display processing (step S111). Specifically, each of the multiple display panels 100 displays the partial video signal output from the display control unit 26. As a result, partial videos are displayed on the multiple display panels 100, and the entire video is displayed on the multi-display 10. By performing display processing using only the partial video signal, it is possible to display the entire video on the multi-display 10 without waiting for the video analysis unit 22 to determine the switching timing.

[0047] In parallel with the display control of the partial video, the display control device 20 analyzes the partial video signal (step S103). Specifically, the video analysis unit 22 of the display control device 20 reads the partial video signal stored in the storage 25 and analyzes the timing at which the entire display panel 100 will display black. The video analysis unit 22 generates a time table indicating the start and end times of the black display on the display panel 100.

[0048] The display control device 20 generates a switching signal based on the analysis result of the video analysis unit 22 (step S104). The switching signal generation unit 23 of the display control device 20 references the timetable generated by the video analysis unit 22 and generates a switching signal for switching the display panel 100 from the first power mode to the second power mode at the start time defined in the timetable. The switching signal generation unit 23 also references the timetable and generates a switching signal for switching the display panel 100 from the second power mode to the first power mode at the end time defined in the timetable. The generated switching signal is stored in the storage 25. The switching signal is generated for each of the multiple display panels 100.

[0049] The display control device 20 performs display control of the display panel 100 using the partial video signal and the switching signal (step S105). Specifically, the display control device 20 reads the partial video signal and the switching signal stored in the storage 25 and outputs them to the display panel 100. At this time, the display control unit 26 outputs the corresponding partial video signal and switching signal to each of the multiple display panels 100. At this time, the display control unit 26 outputs the switching signal to each of the multiple display panels 100 at the corresponding timing.

[0050] In response to the output of the partial video signal and the switching signal by the display control unit 26, the display panel 100 performs display processing (step S112). Specifically, each of the multiple display panels 100 displays the partial video signal output from the display control unit 26, and transitions between the first power mode and the second power mode in accordance with the switching signal. As a result, the entire image is displayed on the multi-display 10 while the corresponding display panel 100 transitions to the second power mode at the time when the entire area displays black. This completes the first example of the display processing by the image display system 1.

[0051] In this manner, in the video display system 1, the video analysis unit 22 determines the timing for switching the operation mode from the first power mode to the second power mode for each of the multiple display panels 100. In addition, the switching signal generation unit 23 generates a switching signal for switching the operation mode from the first power mode to the second power mode for each display panel 100. Then, the display control unit 26 uses the switching signal to control the brightness of the backlight of the display panel 100. As a result, the video display system 1 can reduce power consumption.

[0052] (2-2) Second Example of Display Processing by Video Display System 1 4 is a flow diagram showing a second example of the display process in the video display system 1. In this process, a partial video delivered in real time is temporarily stored, a switching signal is generated, and then the partial video is displayed on the display panel 100.

[0053] 4, in the display process according to the second example, first, the display control device 20 receives an input of a partial video signal (step S201). Specifically, the video input unit 21 of the display control device 20 receives an input of a partial video signal prepared for each display panel 100.

[0054] The display control device 20 temporarily stores the partial video signal received by the video input unit 21 in the memory 24 (step S202). The memory 24 functions as a buffer for the partial video to be distributed. The time during which the memory 24 temporarily stores the video signal is referred to as a buffer time. The memory 24 can temporarily store the partial video signal to be output to the display panel 100 for a buffer time of, for example, about several seconds. The buffer time can be set arbitrarily.

[0055] The display control device 20 analyzes the partial video signal (step S203). Specifically, the video analysis unit 22 of the display control device 20 reads the partial video signal stored in the memory 24 during the buffer time, and analyzes the timing at which the entire display panel 100 displays black. The video analysis unit 22 generates a time table indicating the start and end times of the black display on the display panel 100.

[0056] The display control device 20 generates a switching signal based on the analysis result of the video analysis unit 22 (step S204). The switching signal generation unit 23 of the display control device 20 references the timetable generated by the video analysis unit 22 and generates a switching signal for switching the display panel 100 from the first power mode to the second power mode at the start time defined in the timetable. The switching signal generation unit 23 also references the timetable and generates a switching signal for switching the display panel 100 from the second power mode to the first power mode at the end time defined in the timetable. The generated switching signal is stored in the storage 25. The switching signal is generated for each of the multiple display panels 100.

[0057] The display control device 20 performs display control of the display panel 100 using the partial video signal and the switching signal (step S205). Specifically, the display control device 20 reads the partial video signal and the switching signal stored in the storage 25 and outputs them to the display panel 100. At this time, the display control unit 26 outputs the corresponding partial video signal and switching signal to each of the multiple display panels 100. The partial video signal stored in the memory 24 is then deleted from the memory 24.

[0058] In response to the output of the partial video signal and the switching signal by the display control unit 26, the display panel 100 performs display processing (step S211). Specifically, each of the multiple display panels 100 displays the partial video signal output from the display control unit 26, and transitions between the first power mode and the second power mode in accordance with the switching signal. As a result, the entire image is displayed on the multi-display 10 while the corresponding display panel 100 transitions to the second power mode at the timing when the entire area displays black. This completes the second example of the display processing by the image display system 1.

[0059] In this way, in the second example of the display process, the partial video signal is temporarily stored in the memory 24 that functions as a buffer, and the switching timing of the partial video signal is determined in parallel during the buffer time. As a result, the operation mode of the display panel 100 can be changed at an appropriate timing for the distribution of the partial video signal in real time.

[0060] <Second embodiment> Next, a video display system 2 according to a second embodiment will be described with reference to Fig. 5 and Fig. 6. In this description, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0061] The video display system 2 according to the second embodiment is different from the first embodiment in that the display control device 20A performs a process of generating partial images from an overall video. That is, the video display system 2 according to the second embodiment has a function as a video matrix switcher that displays the overall video on the multi-display 10 by distributing an input overall video signal to each of the multiple display panels 100 and displaying the signal.

[0062] (3) Configuration of the image display system 2 according to the second embodiment 5 is a diagram showing a configuration of an image display system 2 according to the second embodiment. As shown in FIG. 5, in the image display system 2 according to the second embodiment, the display control device 20A further includes a partial image generating unit 27.

[0063] The partial video generation unit 27 generates partial video signals to be input to each of the plurality of display panels 100, based on the entire video signal input to the video input unit 21. The partial video generation unit 27 stores the generated partial video signals in the storage 25.

[0064] In the display control device 20A, the video analysis unit 22 analyzes the switching timing of the partial video generated by the partial video generation unit 27 and stored in the storage 25.

[0065] (4) Display process according to the second embodiment 6 is a flow diagram showing a display process in the video display system 2 according to the second embodiment. As shown in FIG. 6, in this display process, first, the display control device 20A receives an input of an overall video signal (step S301). Specifically, the video input unit 21 of the display control device 20A receives an input of an overall video signal to be displayed on the multi-display 10. The overall video signal is stored in the storage 25.

[0066] The display control device 20A generates a partial video signal based on the full video signal received by the video input unit 21 (step S302). Specifically, the partial video generation unit 27 of the display control device 20A reads the full video signal stored in the storage 25 and generates a partial video signal to be displayed on each of the multiple display panels 100.

[0067] At this time, the partial video generating unit 27 divides the entire video into sections corresponding to the multiple display panels 100, and enlarges the sections according to the sizes of the display panels 100. The partial video generating unit 27 then distributes the partial video signals thus generated as partial video signals for the corresponding display panels 100. For such a process of generating partial video signals from the entire video signal, a known method used for a general video matrix switcher can be adopted.

[0068] Next, the display control device 20A analyzes the partial video signal (step S303). Specifically, the video analysis unit 22 of the display control device 20A reads the partial video signal stored in the storage 25 and analyzes the timing at which the entire display panel 100 displays black. The video analysis unit 22 generates a time table indicating the start and end times of the black display on the display panel 100.

[0069] The display control device 20A generates a switching signal based on the analysis result of the video analysis unit 22 (step S304). The switching signal generation unit 23 of the display control device 20A references the timetable generated by the video analysis unit 22 and generates a switching signal that switches the display panel 100 from the first power mode to the second power mode at the start time defined in the timetable. The switching signal generation unit 23 also references the timetable and generates a switching signal that switches the display panel 100 from the second power mode to the first power mode at the end time defined in the timetable. The generated switching signal is stored in the storage 25. The switching signal is generated for each of the multiple display panels 100.

[0070] The display control device 20A performs display control of the display panel 100 using the partial video signal and the switching signal (step S305). Specifically, the display control device 20A reads the partial video signal and the switching signal stored in the storage 25 and outputs them to the display panel 100. At this time, the display control unit 26 outputs the corresponding partial video signal and switching signal to each of the multiple display panels 100.

[0071] In response to the output of the partial video signal and the switching signal by the display control unit 26, the display panel 100 performs display processing (step S311). Specifically, each of the multiple display panels 100 displays the partial video signal output from the display control unit 26, and transitions between the first power mode and the second power mode in accordance with the switching signal. As a result, the entire image is displayed on the multi-display 10 while the corresponding display panel 100 transitions to the second power mode at the timing when the entire area displays black. This completes the display processing by the image display system 2 according to the second embodiment.

[0072] <Modification> Next, a modification of the image display system 1 will be described.

[0073] In the above first and second embodiments, the multi-display 10 is configured to display a moving image as the entire image, but this is not limited thereto. That is, the multi-display 10 may display a still image whose display content is switched intermittently.

[0074] The embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the above embodiments, and can be implemented in various aspects without departing from the gist of the present invention. In addition, various inventions can be formed by appropriately combining multiple components disclosed in the above embodiments. For example, some components may be deleted from all components shown in the embodiments. Furthermore, components across different embodiments may be appropriately combined. The drawings are mainly shown schematically for ease of understanding, and the thickness, length, number, spacing, etc. of each component shown in the drawings may differ from the actual ones due to the convenience of drawing. In addition, the material, shape, dimensions, etc. of each component shown in the above embodiments are only examples and are not particularly limited, and various changes are possible within a range that does not substantially deviate from the effects of the present invention. [Industrial Applicability]

[0075] The present invention can be applied to a video display system. [Explanation of symbols]

[0076] 1, 2 Video display system 10 Multi-display 20, 20A Display control device 21 Video input section 22 Video Analysis Department 23 Switching signal generator 24 Memory (buffer) 25 Storage (memory section) 26 Display control section 27 Partial video generation section 100 Display Panel 100A 1st display panel 100B Second display panel 100D 3rd display panel 100D 4th display panel

Claims

1. A display control device that displays an entire image on a multi-display formed by an array of a plurality of display panels by displaying a partial image on each of the plurality of display panels, a video analysis unit that analyzes a partial video signal input to each of the plurality of display panels to determine a timing for switching an operation mode from a first power mode to a second power mode having lower power consumption than the first power mode for each of the plurality of display panels; a switching signal generation unit that generates a switching signal for switching the operation mode from the first power mode to the second power mode in accordance with the determined timing for each of the plurality of display panels; A display control device comprising:

2. 2. The display control device according to claim 1, wherein the video analysis unit determines a timing at which an entire screen of one of the plurality of display panels turns black as a timing at which the one display panel switches from the first power mode to the second power mode.

3. the display panel includes a liquid crystal display having a backlight; The display control device according to claim 1 , wherein the second power mode is an operation mode in which a luminance of the backlight of the display panel is uniformly reduced across an entire screen of the display panel.

4. a buffer for temporarily storing the partial video signal to be input to the display panel; The display control device according to claim 1 , wherein the video analysis unit determines the timing by analyzing the partial video signal stored in the buffer while the buffer temporarily stores the partial video signal.

5. a storage unit that stores the partial video signal in a non-time limited manner, The display control device according to claim 1 , wherein the video analysis unit determines the timing by analyzing the partial video signal stored in the storage unit.

6. 2. The display control device according to claim 1, wherein the video analysis unit determines the timing for switching the operating mode from the second power mode to the first power mode for each of the plurality of display panels by analyzing the partial video signal input for each of the plurality of display panels, thereby determining a start time and an end time of the second power mode as the timing, and generating a timetable indicating the start time and the end time.

7. The video analysis unit includes: The display control device according to claim 6 , further comprising: a display control unit configured to determine the end time based on a response characteristic of each of the display panels when the display panels return from the second power mode.

8. A display control device according to any one of claims 1 to 7, A plurality of the display panels; An image display system comprising:

9. A display control method executed by a display control device, which displays an entire video on a multi-display formed by an array of a plurality of display panels by displaying a partial video on each of the display panels, the display control method comprising: determining, for each of the plurality of display panels, a timing for switching an operation mode from a first power mode to a second power mode having lower power consumption than the first power mode by analyzing a partial video signal input to each of the plurality of display panels; generating a switching signal for switching the operation mode from the first power mode to the second power mode in accordance with the determined timing for each of the plurality of display panels; A display control method comprising:

Images