Display unit, method, program, and system

Abstract

To allow a user to receive a visual stimulus according to a specific frequency through viewing of image content displayed by a display unit.SOLUTION: A display unit of an aspect of the present disclosure is provided with: image display unit that displays images according to supplied image frames; means that acquires input image signals having a frame rate different from 40 frame per second (fps); and means that generates the image frames to be supplied to the image display unit on the basis of the input image signals so that the screen luminance of the images displayed by the image display unit increases and decreases at a period of approximately 40 Hz.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a display device, a method, a program, and a system. [Background technology]

[0002] There are research reports that suggest that exposing an organism to pulsating light or sound stimuli at a frequency of about 40 times per second and inducing gamma waves in the organism's brain can be effective in improving the organism's cognitive function (see Non-Patent Document 1). Gamma waves refer to neural oscillations that capture periodic neural activity in the brain's cortex using electrophysiological techniques such as electroencephalography and magnetoencephalography, and whose frequencies fall within the gamma band (25 to 140 Hz).

[0003] Patent Document 1 discloses a technical idea of ​​realizing visual stimulation by turning on and off a display screen or pixels. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2020-501853 [Non-patent literature]

[0005] [Non-Patent Document 1] Multi-sensory Gamma Stimulation Ameliorates Alzheimer's-Associated Pathology and Improves Cognition Cell 2019 Apr 4;177(2):256-271.e22. doi: 10.1016 / j.cell.2019.02.014. Summary of the Invention [Problem to be solved by the invention]

[0006] Patent Document 1 does not fully disclose specific implementation means for generating a visual stimulus of a specific frequency while displaying video content on a display device.

[0007] An object of the present disclosure is to enable a user to receive visual stimulation corresponding to a specific frequency through viewing video content displayed by a display device. [Means for solving the problem]

[0008] A display device according to one embodiment of the present disclosure includes a video display unit that displays a video corresponding to a supplied video frame, a means for acquiring an input video signal having a frame rate different from 40 fps (frames per second), and a means for generating a video frame to be supplied to the video display unit based on the input video signal so that the screen brightness of the video displayed by the video display unit increases and decreases at a cycle of approximately 40 Hz. [Brief description of the drawings]

[0009] [Figure 1] 1 is a block diagram showing a configuration of a display device according to an embodiment of the present invention; [Diagram 2] FIG. 1 is an explanatory diagram of one aspect of the present embodiment. [Diagram 3] FIG. 2 is a diagram showing an overall flow of information processing according to the present embodiment. [Figure 4] FIG. 1 is a diagram showing a first example of generation of a video frame. [Diagram 5] FIG. 11 is a diagram showing a second example of generation of a video frame. [Figure 6] FIG. 11 is a diagram showing a third example of generation of a video frame. [Figure 7] FIG. 13 is a diagram showing an overall flow of information processing in the first modified example. [Figure 8] FIG. 1 is a diagram showing a first example of generation of a video frame. [Figure 9] FIG. 11 is a diagram showing a second example of generation of a video frame. [Figure 10] FIG. 11 is a diagram showing a third example of generation of a video frame. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the drawings for explaining the embodiment, the same components are generally designated by the same reference numerals, and the repeated description will be omitted.

[0011] (1) Display device configuration The configuration of the display device of this embodiment will be described below. Fig. 1 is a block diagram showing the configuration of the display device of this embodiment.

[0012] The display device of the present embodiment may be, for example, a liquid crystal display device (which may include a liquid crystal television receiver), an organic EL (Electroluminescence) display device (which may include an organic EL television receiver), a plasma display device, a micro LED (Light-Emitting Diode) display device, a HUD (Head-Up Display), a film-type display, a liquid crystal projector, or a DLP (registered trademark) (Digital Light Processing) projector, but is not limited to these. The display device may be a stationary display device, a wearable device such as a head-mounted display or a glass-type display, or a smartphone or a tablet terminal.

[0013] A liquid crystal display device (an example of a display device 10) may include, for example, a liquid crystal panel, a backlight, a video processing circuit, an audio processing circuit, and an input terminal.

[0014] An organic EL display device (an example of the display device 10) may include, for example, an organic EL panel, a video processing circuit, an audio processing circuit, and an input terminal.

[0015] A liquid crystal projector (an example of the display device 10) may include, for example, a light source, an optical system, a display element, a video processing circuit, an input terminal, and a cooling fan.

[0016] As shown in FIG. 1, the display device 10 includes a storage device 11, a processor 12, an input / output interface 13, a communication interface 14, and a video display unit 15.

[0017] The storage device 11 is configured to store programs and data. The storage device 11 is, for example, a combination of a Read Only Memory (ROM), a Random Access Memory (RAM), and a storage (for example, a flash memory or a hard disk).

[0018] The program may include, for example, the following programs: Image processing programs A control program for the display device 10 ·OS (Operating System) programs Applications that process information (e.g. web browsers)

[0019] The data may include, for example, the following data: ·image Databases referenced in information processing Data obtained by performing information processing (i.e., the results of performing information processing)

[0020] The processor 12 performs various information processing such as control of the display device 10 or image processing. The processor 12 may be a dedicated circuit, a general-purpose processor, or a combination thereof. The processor 12 may include a computer that realizes the functions of the display device 10 by starting a program stored in the storage device 11. The processor 12 may include, for example, at least one of the following: ·CPU(Central Processing Unit) ·GPU(Graphic Processing Unit) ·ASIC(Application Specific Integrated Circuit) ·FPGA(Field Programmable Gate Array)

[0021] The input / output interface 13 is configured to obtain information (e.g., a video signal, a user's instruction, etc.) from an input device connected to the display device 10, and to output information (e.g., a video signal, an audio signal, etc.) to an output device connected to the display device 10. The input / output interface 13 includes a terminal capable of inputting a video signal, such as an antenna terminal, an HDMI (registered trademark) (High-Definition Multimedia Interface) terminal, a USB terminal, etc.

[0022] The input device is, for example, a television broadcast antenna device, a tuner device, an information processing device (for example, a PC (Personal Computer) or a smartphone), a media streaming device, a keyboard, a pointing device, a touch panel, or a combination thereof. The output device is, for example, a display device different from the display device 10, a speaker, or a combination thereof.

[0023] The communication interface 14 is configured to control communication between the display device 10 and an external device. However, the display device 10 may be configured not to include the communication interface 14.

[0024] The video display unit 15 is configured to display an image (a still image or a video image). The video display unit 15 is, for example, a liquid crystal panel, an organic EL panel, or an optical system for projecting an image (which may include a light source and a display element). In this embodiment, the video display unit 15 is capable of realizing a refresh rate that is two or more multiples of a frequency corresponding to gamma waves (for example, approximately 40 Hz). However, in Modification Example 2 described later, there is no such restriction. In this embodiment, "approximately 40 Hz" refers to a value (for example, 35 Hz to 45 Hz) that is within an error range of about 10% with 40 Hz as the reference.

[0025] (2) One aspect of the embodiment An embodiment of the present invention will now be described with reference to Fig. 2, which is an explanatory diagram of an embodiment of the present invention.

[0026] Display device 10 obtains an input video signal from an external device (e.g., an antenna device or a tuner device). The input video signal has an arbitrary frame rate (for example, a frame rate different from 40 fps (frames per second)). Display device 10 (processor 12) generates video frames to be supplied to video display unit 15 based on the input video signal so that the screen brightness of the video displayed by video display unit 15 increases and decreases in a cycle of a frequency corresponding to gamma waves (for example, approximately 40 Hz), and sends the video frames to video display unit 15. Video display unit 15 displays a video corresponding to the supplied video frames.

[0027] As an example, as shown in FIG. 2, it is assumed that the display device 10 acquires frames FI10-1 to FI10-4 as an input video signal of 120 fps. In this case, the display device 10 may generate a video frame including frames FO10-1, FO11-1, FO12-1, and FO10-2. Frame FO10-1 is the same as frame FI10-1. Frame FO11-1 corresponds to a dark frame (an all-black frame, for example) in which the luminance of the entire screen is approximately uniform. Frame FO12-1 corresponds to a light frame (an all-white frame, for example) in which the luminance of the entire screen is approximately uniform. Frame FO10-2 is the same as frame FI10-4.

[0028] In this way, in the video frame of FIG. 2, a frame set consisting of a bright frame (frame FO12-1) with a substantially uniform brightness across the entire screen, frames (frames FO10-1, FO10-2) included in the input video signal, and a dark frame (frame FO11-1) with a substantially uniform brightness across the entire screen is repeated in a 1 / 40 s cycle. Therefore, a person viewing the video display unit 15 (hereinafter referred to as the "viewer") is stimulated by the intensity of light repeated in a cycle of approximately 40 Hz. As a result, gamma waves are induced in the viewer's brain (i.e., the intensity of brain waves in the gamma band is improved) or synchronized (i.e., the synchronization of brain waves with respect to the frequency of the gamma band is improved), or both are caused. This can be expected to have an effect of improving the viewer's cognitive function (e.g., treating or preventing dementia).

[0029] (3) Information processing The information processing of this embodiment will be described. Fig. 3 is a diagram showing an overall flow of the information processing of this embodiment. Fig. 4 is a diagram showing a first example of video frame generation. Fig. 5 is a diagram showing a second example of video frame generation. Fig. 6 is a diagram showing a third example of video frame generation.

[0030] The information processing of the present embodiment can be started, for example, in response to detection of input of a video signal in the display device 10.

[0031] As shown in FIG. 3, the display device 10 acquires an input video signal (S110). Specifically, the display device 10 acquires an input video signal from an external device. As an example, the processor 12 acquires the input video signal via a video input terminal serving as the input / output interface 13.

[0032] In a first example of acquiring an input video signal (S110), the input video signal has a frame rate that is a multiple of approximately 40 (for example, 35 to 45). In a second example of acquiring an input video signal (S110), the input video signal has a frame rate that is different from a multiple of approximately 40. In either example, the display device 10 may generate frames that correspond to any timing of the input video signal, for example by frame interpolation, as necessary.

[0033] After step S110, the display device 10 generates a video frame (S111). Specifically, the display device 10 generates a video frame based on the input video signal acquired in step S110. The input video signal may be a video signal based on video content such as a television broadcast program or a video supplied via a network.

[0034] In a first example of generating video frames (S111), the refresh rate of video display unit 15 is required to be equal to or greater than 70 Hz and a multiple of approximately 40 Hz (e.g., a multiple of any frequency between 35 Hz and 45 Hz). In this example, display device 10 generates video frames as shown in FIG.

[0035] Specifically, the display device 10 generates video frames such that a frame set (frame set FS2-1, FS2-2, FS2-3) including a first frame (frames FO20-1, FO20-2, FO20-3) based on an input video signal and a second frame (frames FO21-1, FO21-2, FO21-3) having a screen luminance different from that of the first frame is generated at a cycle of 40 Hz. In the example of Fig. 4, the frame rate of the video frames is 80 fps.

[0036] The display device 10 may treat any of the frames included in the input video signal as the first frame, or may generate the first frame by interpolating the frames included in the input video signal. For example, when the frame rate of the input video signal is a multiple of 40, the display device 10 can generate the first frame by extracting frames constituting the input video signal at a cycle of 1 / 40 seconds. For example, when the frame rate of the input video signal is not a multiple of 40 (e.g., 30 fps), the display device 10 may generate the first frame by extracting one frame from the frames constituting the input video signal that is close to the timing corresponding to the first frame. Alternatively, the display device 10 may generate the first frame by performing video interpolation processing using a plurality of frames from the frames constituting the input video signal that are close to the timing corresponding to the first frame.

[0037] The display device 10 can employ, for example, any of the following as the second frame. - Bright frame with uniform brightness across the entire screen -Dark frame with uniform brightness across the entire screen -The first frame has been made brighter -The first frame's brightness has been changed to darker In the following description, a light frame with a substantially uniform luminance across the screen may be a frame with a color independent of the first frame, such as an all-white frame, or a frame with a color corresponding to the first frame (e.g., a lighter color similar to the dominant color in the first frame). Similarly, a dark frame with a substantially uniform luminance across the screen may be a frame with a color independent of the first frame, such as an all-black frame, or a frame with a color corresponding to the first frame (e.g., a darker color similar to the dominant color in the first frame).

[0038] In addition, when the second frame is a frame obtained by changing the luminance of the first frame to be brighter or darker, the display device 10 may change any of the frames included in the input video signal to be brighter or darker, or may change a frame generated by interpolation from a frame included in the input video signal to be brighter or darker.

[0039] This allows the screen brightness of the image displayed by the image display unit 15 to be increased or decreased at a cycle of 40 Hz (i.e., changing from "medium" to "high" to "medium", or from "medium" to "low" to "medium").

[0040] In a second example of generating video frames (S111), the refresh rate of video display unit 15 is required to be equal to or greater than 105 Hz and a multiple of approximately 40 Hz. In this example, display device 10 generates video frames as shown in FIG.

[0041] Specifically, the display device 10 generates video frames such that a frame set (frame set FS3-1, FS3-2) including a first frame (frames FO30-1, FO30-2) based on an input video signal, a second frame (frames FO31-1, FO31-2) having a screen luminance different from that of the first frame, and a third frame (FO32-1, FO32-2) having a screen luminance different from that of the first and second frames is generated at a cycle of 40 Hz. In the example of FIG. 5, the frame rate of the video frames is 120 fps. Note that, in the example of FIG. 5, the first frame, the second frame, and the third frame are arranged in this order, but the order may be changed to, for example, the first frame, the third frame, and the second frame.

[0042] The display device 10 may treat any one of the frames included in the input video signal as the first frame, or may generate the first frame by interpolation using the frames included in the input video signal.

[0043] The relationship of the screen luminance among the first, second and third frames can be variously defined.

[0044] In the first relationship, the screen luminance of the second frame is set to be lower than that of the first frame, and the screen luminance of the third frame is set to be higher than that of the first frame. In the second relationship, the screen luminance of the second frame and the third frame is both set to be higher than that of the first frame. In the third relationship, the screen luminance of the second frame and the third frame is both set to be lower than that of the first frame. However, since the first frame depends on the input video signal, the magnitude relationship of the screen luminance described here does not need to always hold, but only needs to hold generally.

[0045] When the first relationship is adopted, the display device 10 can adopt, for example, any of the following as the second frame. -Dark frame with uniform brightness across the entire screen -The first frame's brightness has been changed to darker When the second frame is a frame obtained by darkening the luminance of the first frame, the display device 10 may darken any of the frames included in the input video signal, or may darken a frame generated by interpolation from a frame included in the input video signal.

[0046] When the first relationship is adopted, the display device 10 can adopt, for example, any of the following as the third frame. - Bright frame with uniform brightness across the entire screen -The first frame has been made brighter When the third frame is a frame in which the luminance of the first frame has been brightened, the display device 10 may brighten any of the frames included in the input video signal, or may brighten a frame generated by interpolating a frame included in the input video signal.

[0047] Furthermore, the display device 10 displays the frames in each frame set in either the order of the first frame→second frame→third frame, or the order of the first frame→third frame→second frame.

[0048] This allows the screen brightness of the image displayed by the image display unit 15 to be increased or decreased at a cycle of 40 Hz (i.e., changing from "medium" to "low" to "high" to "medium", or from "medium" to "high" to "low" to "medium"). When changing from "low" to "high," overdrive can be used to change the luminance sharply, providing a greater stimulus to the viewer.

[0049] When the second relationship is adopted, the display device 10 can adopt, for example, any of the following as the second frame and the third frame. - Bright frame with uniform brightness across the entire screen -The first frame has been made brighter However, the display device 10 generates the third frame so that the screen luminance is higher than that of the second frame. In addition, when the second or third frame is a frame obtained by brightening the luminance of the first frame, the display device 10 may brighten any of the frames included in the input video signal, or may brighten a frame generated by interpolation from a frame included in the input video signal.

[0050] Furthermore, the display device 10 displays the frames in each frame set in either the order of the first frame→second frame→third frame, or the order of the first frame→third frame→second frame.

[0051] This allows the screen brightness of the image displayed by the image display unit 15 to be increased or decreased at a cycle of 40 Hz (i.e., change from "medium" → "slightly high" → "high" → "medium", or from "medium" → "high" → "slightly high" → "medium").

[0052] When the third relationship is adopted, the display device 10 can adopt, for example, any of the following as the second frame and the third frame. -Dark frame with uniform brightness across the entire screen -The first frame's brightness has been changed to darker However, the display device 10 generates the third frame so that the screen luminance is higher than that of the second frame. In addition, when the second or third frame is a frame obtained by darkening the luminance of the first frame, the display device 10 may darken any of the frames included in the input video signal, or may darken a frame generated by interpolation from a frame included in the input video signal.

[0053] Furthermore, the display device 10 displays the frames in each frame set in either the order of the first frame→second frame→third frame, or the order of the first frame→third frame→second frame.

[0054] This allows the screen brightness of the image displayed by the image display unit 15 to be increased or decreased at a cycle of 40 Hz (i.e., change from "medium" to "low" to "slightly low" to "medium", or from "medium" to "slightly low" to "low" to "medium").

[0055] In a third example of generating video frames (S111), the refresh rate of video display unit 15 is required to be equal to or greater than 140 Hz and a multiple of approximately 40 Hz. In this example, display device 10 generates video frames as shown in FIG.

[0056] Specifically, the display device 10 generates video frames such that a frame set (frame set FS4-1) including a first frame (frame FO40-1) based on an input video signal, a second frame (frame FO41-1) having a screen luminance different from that of the first frame, a third frame (frame FO42-1) having a screen luminance different from that of the first and second frames, and a fourth frame (frame FO43-1) having a screen luminance different from that of the first, second, and third frames is generated at a cycle of 40 Hz. In the example of Fig. 6, the frame rate of the video frames is 160 fps.

[0057] The display device 10 may treat any one of the frames included in the input video signal as the first frame, or may generate the first frame by interpolation using the frames included in the input video signal.

[0058] The relationship of the screen luminance among the first, second, third and fourth frames can be defined in various ways.

[0059] In the first relationship, the screen luminance of the second frame is set to be lower than that of the first frame, and the screen luminance of the third and fourth frames is set to be higher than that of the first frame. In the second relationship, the screen luminance of the second and third frames is set to be lower than that of the first frame, and the screen luminance of the fourth frame is set to be higher than that of the first frame. In the third relationship, the screen luminance of the second, third and fourth frames is set to be higher than that of the first frame. In the fourth relationship, the screen luminance of the second, third and fourth frames is set to be lower than that of the first frame. However, since the first frame depends on the input video signal, the magnitude relationship of the screen luminance described here does not need to be always true, but only needs to be true generally.

[0060] When the first relationship is adopted, the display device 10 can adopt, for example, any of the following as the second frame. -Dark frame with uniform brightness across the entire screen -The first frame's brightness has been changed to darker When the second frame is a frame obtained by darkening the luminance of the first frame, the display device 10 may darken any of the frames included in the input video signal, or may darken a frame generated by interpolation from a frame included in the input video signal.

[0061] When the first relationship is adopted, the display device 10 can adopt, for example, any of the following for the third and fourth frames. - Bright frame with uniform brightness across the entire screen -The first frame has been made brighter However, the display device 10 generates the fourth frame so that the screen luminance is higher than that of the third frame. In addition, when the third or fourth frame is a frame obtained by brightening the luminance of the first frame, the display device 10 may brighten any of the frames included in the input video signal, or may brighten a frame generated by interpolation from a frame included in the input video signal.

[0062] Furthermore, the display device 10 displays the frames in each frame set in either the order of the first frame→second frame→fourth frame→third frame, or the order of the first frame→third frame→fourth frame→second frame.

[0063] This allows the screen brightness of the image displayed by the image display unit 15 to be increased or decreased at a cycle of 40 Hz (i.e., change from "medium" → "low" → "high" → "slightly high" → "medium", or from "medium" → "slightly high" → "high" → "low" → "medium").

[0064] When the second relationship is adopted, the display device 10 can adopt, for example, any of the following as the second frame and the third frame. -Dark frame with uniform brightness across the entire screen -The first frame's brightness has been changed to darker However, the display device 10 generates the third frame so that the screen luminance is higher than that of the second frame. In addition, when the third frame or the second frame is a frame obtained by darkening the luminance of the first frame, the display device 10 may darken any of the frames included in the input video signal, or may darken a frame generated by interpolation from a frame included in the input video signal.

[0065] When the second relationship is adopted, the display device 10 can adopt, for example, any of the following as the fourth frame. - Bright frame with uniform brightness across the entire screen -The first frame has been made brighter When the fourth frame is a frame in which the luminance of the first frame has been brightened, the display device 10 may brighten any of the frames included in the input video signal, or may brighten a frame generated by interpolation from a frame included in the input video signal.

[0066] Furthermore, the display device 10 displays the frames in each frame set in either the order of the first frame→third frame→second frame→fourth frame, or the order of the first frame→fourth frame→second frame→third frame.

[0067] This allows the screen brightness of the image displayed by image display unit 15 to be increased or decreased at a cycle of 40 Hz (i.e., change from "medium" → "slightly low" → "low" → "high" → "medium", or from "medium" → "high" → "low" → "slightly low" → "medium").

[0068] When the third relationship is adopted, the display device 10 can adopt, for example, any of the following as the second frame, the third frame, and the fourth frame. - Bright frame with uniform brightness across the entire screen -The first frame has been made brighter However, display device 10 generates the fourth frame so that the screen luminance is higher than that of the third frame. Also, display device 10 generates the third frame so that the screen luminance is higher than that of the second frame. In addition, when the second, third, or fourth frame is a frame obtained by brightening the luminance of the first frame, the display device 10 may brighten any of the frames included in the input video signal, or may brighten a frame generated by interpolation from a frame included in the input video signal.

[0069] Furthermore, the display device 10 displays the frames in each frame set in either the order of the first frame→fourth frame→third frame→second frame, or the order of the first frame→second frame→third frame→fourth frame.

[0070] This allows the screen brightness of the image displayed by the image display unit 15 to be increased or decreased at a cycle of 40 Hz (i.e., change from "medium" to "high" to "slightly high" to "slightly high" to "medium", or from "medium" to "slightly high" to "slightly high" to "high" to "medium").

[0071] When the fourth relationship is adopted, the display device 10 can adopt, for example, any of the following as the second frame, the third frame, and the fourth frame. -Dark frame with uniform brightness across the entire screen -The first frame's brightness has been changed to darker However, display device 10 generates the fourth frame so that the screen luminance is higher than that of the third frame. Also, display device 10 generates the third frame so that the screen luminance is higher than that of the second frame. In addition, when the second, third, or fourth frame is a frame obtained by darkening the luminance of the first frame, the display device 10 may darken any of the frames included in the input video signal, or may darken a frame generated by interpolation from a frame included in the input video signal.

[0072] Furthermore, the display device 10 displays the frames in each frame set in either the order of the first frame→fourth frame→third frame→second frame, or the order of the first frame→second frame→third frame→fourth frame.

[0073] This allows the screen brightness of the image displayed by the image display unit 15 to be increased or decreased at a cycle of 40 Hz (i.e., change from "medium" to "slightly low" to "somewhat low" to "low" to "medium", or from "medium" to "low" to "somewhat low" to "slightly low" to "medium").

[0074] In the fourth example of generating video frames (S111), the refresh rate of video display unit 15 is required to be equal to or greater than 140 Hz and a multiple of approximately 40 Hz.

[0075] Specifically, the display device 10 generates video frames such that a frame set including a first frame based on the input video signal, a second frame having a screen luminance different from that of the first frame, and a third frame having a screen luminance different from that of the first and second frames is generated at a period of 40 Hz.

[0076] The display device 10 may treat any one of the frames included in the input video signal as the first frame, or may generate the first frame by interpolation using the frames included in the input video signal.

[0077] The relationship of the screen luminance among the first, second and third frames can be defined as follows: Specifically, the screen luminance of the second frame is set to be lower than that of the first frame, and the screen luminance of the third frame is set to be higher than that of the first frame. However, since the first frame depends on the input video signal, the relationship between the screen luminance magnitudes described here does not need to always hold true, but only needs to hold true generally.

[0078] When the above relationship is adopted, the display device 10 can adopt, for example, any of the following as the second frame. -Dark frame with uniform brightness across the entire screen -The first frame's brightness has been changed to darker When the second frame is a frame obtained by darkening the luminance of the first frame, the display device 10 may darken any of the frames included in the input video signal, or may darken a frame generated by interpolation from a frame included in the input video signal.

[0079] When the above relationship is adopted, the display device 10 can adopt, for example, any of the following as the third frame. - Bright frame with uniform brightness across the entire screen -The first frame has been made brighter When the third frame is a frame in which the luminance of the first frame has been brightened, the display device 10 may brighten any of the frames included in the input video signal, or may brighten a frame generated by interpolating a frame included in the input video signal.

[0080] Furthermore, the display device 10 displays the frames in each frame set in either the order of the first frame→second frame→first frame→third frame, or the order of the first frame→third frame→first frame→second frame.

[0081] This allows the screen brightness of the image displayed by image display unit 15 to be increased or decreased at a cycle of 40 Hz (i.e., change from "medium" → "low" → "medium" → "high" → "medium", or from "medium" → "high" → "medium" → "low" → "medium").

[0082] This embodiment is also applicable to the case where the number of frames included in a frame set of one cycle (1 / 40 s) is 5 or more. That is, by generating at least a part of the frame set (at least the first frame) based on an input video signal and adjusting the screen luminance of the remaining frames, and arranging each frame so that the screen luminance decreases or increases, it is possible to increase or decrease the brightness within one cycle.

[0083] After step S111, the display device 10 outputs a video frame (S112). Specifically, the display device 10 (processor 12) sends the video frame generated in step S111 to the video display unit 15. The video display unit 15 displays a video according to the supplied video frame.

[0084] The display device 10 can repeatedly execute the steps from obtaining an input video signal (S110) to outputting a video frame (S112). The display device 10 can end the information processing of the present embodiment in response to, for example, detection of a stop of the input of the video signal.

[0085] (4) Summary As described above, the display device 10 includes the video display unit 15 that displays a video according to the supplied video frame. The display device 10 also acquires an input video signal having a frame rate different from 40 fps (frames per second), and generates a video frame to be supplied to the video display unit 15 based on the input video signal so that the screen luminance of the video displayed by the video display unit 15 increases and decreases at a cycle of approximately 40 Hz. This allows the display device 10 to display video content such as a television broadcast program or a video supplied via a network while increasing and decreasing the screen luminance at a cycle of approximately 40 Hz. Therefore, by simply having the viewer watch content that interests them, gamma waves can be induced or synchronized in the viewer's brain, and the effect of improving the viewer's cognitive function (for example, treating or preventing dementia) can be expected.

[0086] The refresh rate of the video display unit 15 may be equal to or greater than 70 Hz and may be a multiple of approximately 40 Hz. The display device 10 may generate video frames to be supplied to the video display unit 15 based on the input video signal such that a frame set including a first frame based on the input video signal and a second frame having a screen luminance different from that of the first frame is displayed at a cycle of approximately 40 Hz. This allows the display device 10 to repeatedly increase and decrease the screen luminance between a frame based on the input video signal and a frame having a higher or lower screen luminance at a cycle of approximately 40 Hz.

[0087] The second frame may be a bright frame or a dark frame in which the luminance of the entire screen is approximately uniform, thereby making it possible to more reliably increase or decrease the screen luminance regardless of the luminance distribution of the input video signal.

[0088] The second frame may be a frame obtained by changing the luminance of the first frame to be brighter or darker, whereby the second frame is correlated with the first frame, and therefore the sense of incongruity felt by the viewer can be suppressed.

[0089] The refresh rate may be equal to or greater than 105 Hz and may be a multiple of approximately 40 Hz. The frame set may include a first frame based on the input video signal, a second frame having a lower screen luminance than the first frame, and a third frame having a higher screen luminance than the first frame. This increases the range of increase and decrease in screen luminance, thereby increasing the intensity of the stimulus given to the viewer.

[0090] The refresh rate may be equal to or greater than 140 Hz and may be a multiple of approximately 40 Hz. The frame set may include a fourth frame having a higher screen luminance than the third frame, and the frames included in the frame set may be displayed in the order of the fourth frame, the third frame, the first frame, and the second frame. This causes the screen luminance to change in an inverse sawtooth wave shape, which is expected to increase the intensity of the stimulus given to the viewer while suppressing discomfort.

[0091] (5) Variations A modification of this embodiment will now be described.

[0092] (5-1) Variation 1 A description will now be given of Modification 1. Modification 1 is an example in which the color tone of an image is changed at a cycle of approximately 40 Hz.

[0093] The information processing of the first modification will be described. Fig. 7 is a diagram showing an overall flow of the information processing of the first modification. Fig. 8 is a diagram showing a first example of the generation of a video frame. Fig. 9 is a diagram showing a second example of the generation of a video frame. Fig. 10 is a diagram showing a third example of the generation of a video frame.

[0094] The information processing of the first modification may be started, for example, in response to detection of input of a video signal in the display device 10.

[0095] 7, the display device 10 executes acquisition of an input video signal (S110). Acquisition of an input video signal (S110) in the first modification is similar to that in the present embodiment.

[0096] After step S110, the display device 10 executes generation of a video frame (S211). Specifically, the display device 10 generates a video frame based on the input video signal acquired in step S110.

[0097] In a first example of generating video frames (S211), the refresh rate of video display unit 15 is required to be equal to or greater than 70 Hz and a multiple of approximately 40 Hz. In this example, display device 10 generates video frames as shown in FIG.

[0098] Specifically, the display device 10 generates video frames such that a frame set including a first frame (frames FO50-1, FO50-2, FO50-3) based on the input video signal (frames FI50-1, FI50-2, FI50-3) and a second frame (frames FO51-1, FO51-2, FO51-3) corresponding to a complementary color image or grayscale image of the first frame is generated at a cycle of 40 Hz. In the example of Fig. 8, the frame rate of the video frames is 80 fps.

[0099] The display device 10 may treat any of the frames included in the input video signal as the first frame, or may generate the first frame by interpolating the frames included in the input video signal. For example, when the frame rate of the input video signal is a multiple of 40, the display device 10 can generate the first frame by extracting frames constituting the input video signal at a cycle of 1 / 40 seconds. For example, when the frame rate of the input video signal is not a multiple of 40 (e.g., 30 fps), the display device 10 may generate the first frame by extracting one frame from the frames constituting the input video signal that is close to the timing corresponding to the first frame. Alternatively, the display device 10 may generate the first frame by performing video interpolation processing using a plurality of frames from the frames constituting the input video signal that are close to the timing corresponding to the first frame.

[0100] The display device 10 can employ, for example, any of the following as the second frame. A frame obtained by converting the most recent first frame to grayscale or complementary color. A frame obtained by converting any frame in the input video signal to grayscale or complementary color. A frame obtained by performing grayscale or complementary color conversion on a frame generated by interpolation from a frame included in the input video signal

[0101] This allows the color tone of the image displayed by the image display unit 15 to be changed at a cycle of 40 Hz (i.e., change from "full color" to "grayscale" to "full color", or from "original color" to "complementary color" to "original color").

[0102] In a second example of generating video frames (S211), the refresh rate of video display unit 15 is required to be equal to or greater than 105 Hz and a multiple of approximately 40 Hz. In this example, display device 10 generates video frames as shown in FIG.

[0103] Specifically, the display device 10 generates video frames such that a frame set including a first frame (frames FO60-1, FO60-2) based on the R signal of the input video signal (frames FI60-1, FI60-2), a second frame (frames FO61-1, FO61-2) based on the G signal of the input video signal, and a third frame (frames FO62-1, FO62-2) based on the B signal of the input video signal is generated at a cycle of 40 Hz. In the example of Fig. 9, the frame rate of the video frames is 120 fps.

[0104] The display device 10 may treat images corresponding to the R signal, G signal, and B signal of any frame included in the input video signal as the first frame, the second frame, and the third frame. Alternatively, the display device 10 may treat images corresponding to the R signal, G signal, and B signal of a frame generated by interpolation from a frame included in the input video signal as the first frame, the second frame, and the third frame. For example, when the frame rate of the input video signal is a multiple of 40, the display device 10 can generate the first frame, the second frame, and the third frame by extracting frames constituting the input video signal at a period of 1 / 40 seconds and separating the extracted frames into RGB components. Also, for example, when the frame rate of the input video signal is not a multiple of 40 (e.g., 30 fps), the display device 10 may extract one frame near the timing corresponding to the first frame from the frames constituting the input video signal and separate the extracted frame into RGB components to generate the first frame, the second frame, and the third frame. Alternatively, the display device 10 may generate the first, second, and third frames by separating frames generated by video interpolation processing using a plurality of frames constituting the input video signal that are in the vicinity of the timing corresponding to the first frame into RGB components.

[0105] This allows the color tone of the image displayed by image display unit 15 to change at a cycle of 40 Hz (i.e., from "red" to "green" to "blue" to "red", or from "red" to "blue" to "green" to "red").

[0106] In a third example of generating video frames (S211), the refresh rate of video display unit 15 is required to be equal to or greater than 70 Hz and a multiple of approximately 40 Hz. In this example, display device 10 generates video frames as shown in FIG.

[0107] Specifically, the display device 10 generates video frames such that a frame set including a first frame (frames FO70-1, FO70-2, FO70-3) based on the R and B signals of the input video signal (frames FI70-1, FI70-2, FI70-3) and a second frame (frames FO71-1, FO71-2, FO71-3) based on the G signal of the input video signal is generated at a cycle of 40 Hz. In the example of Fig. 10, the frame rate of the video frames is 80 fps.

[0108] The display device 10 may treat an image corresponding to the R signal and the B signal of any frame included in the input video signal, and an image corresponding to the G signal, as the first frame and the second frame, respectively. Alternatively, the display device 10 may treat an image corresponding to the R signal and the B signal of a frame generated by interpolation from a frame included in the input video signal, and an image corresponding to the G signal, as the first frame and the second frame, respectively. For example, when the frame rate of the input video signal is a multiple of 40, the display device 10 can generate the first frame and the second frame by extracting frames constituting the input video signal at a period of 1 / 40 seconds and separating the extracted frames into RGB components. Also, for example, when the frame rate of the input video signal is not a multiple of 40 (e.g., 30 fps), the display device 10 may extract one frame near the timing corresponding to the first frame from the frames constituting the input video signal, and separate the extracted frame into RGB components, to generate the first frame and the second frame. Alternatively, the display device 10 may generate the first and second frames by separating a frame generated by video interpolation processing using a plurality of frames constituting the input video signal that are in the vicinity of the timing corresponding to the first frame into RGB components.

[0109] This allows the color tone of the image displayed by the image display unit 15 to be changed at a cycle of 40 Hz (i.e., changing from "red / blue" to "green" to "red / blue"). Humans are most sensitive to the G signal among RGB, so by dividing the signal into G and RB, it is possible to suppress imbalance in the response to stimuli.

[0110] After step S111, the display device 10 outputs the video frame (S112). The output of the video frame in the first modification (S112) is the same as in the present embodiment.

[0111] The display device 10 can repeatedly execute the steps from obtaining an input video signal (S110) to outputting a video frame (S112). The display device 10 can end the information processing of the first modification in response to, for example, detecting the stop of the input of the video signal.

[0112] As described above, the display device 10 of the first modification may include a video display unit 15 having a refresh rate of 70 Hz or more and a multiple of approximately 40 Hz, and displaying a video corresponding to a supplied video frame. The display device 10 may acquire an input video signal, and generate video frames to be supplied to the video display unit 15 based on the input video signal, such that a frame set including a first frame based on the input video signal and a second frame corresponding to a complementary color image or a grayscale image of the first frame is displayed at a cycle of approximately 40 Hz. This allows the display device 10 to repeatedly change the color tone between full color and grayscale at a cycle of approximately 40 Hz.

[0113] The display device 10 of the first modification may include a video display unit 15 having a refresh rate of 105 Hz or more and a multiple of approximately 40 Hz, and displaying a video according to a supplied video frame. The display device 10 may acquire an input video signal, and generate video frames to be supplied to the video display unit 15 based on the input video signal such that a frame set including a first frame based on an R signal of the input video signal, a second frame based on a G signal of the input video signal, and a third frame based on a B signal of the input video signal is displayed at a cycle of approximately 40 Hz. This allows the display device 10 to repeat color tone changes between red, blue, and green at a cycle of approximately 40 Hz.

[0114] The display device 10 of the first modification may include a video display unit 15 having a refresh rate of 70 Hz or more and a multiple of approximately 40 Hz, and displaying a video according to a supplied video frame. The display device 10 may acquire an input video signal, and generate video frames to be supplied to the video display unit 15 based on the input video signal such that a frame set including a first frame based on the R signal and B signal of the input video signal and a second frame based on the G signal of the input video signal is displayed at a cycle of approximately 40 Hz. This allows the display device 10 to repeat color tone changes between red, blue, and green at a cycle of approximately 40 Hz.

[0115] (5-2) Variation 2 A description will now be given of Modification 2. Modification 2 is an example in which the screen luminance of an image is increased and decreased at a cycle of approximately 40 Hz by an approach different from that of this embodiment.

[0116] Specifically, the display device 10 of the second modification may be, but is not limited to, a liquid crystal display device (which may include a liquid crystal television receiver) or a liquid crystal projector. The image display unit 15 of the display device 10 includes a light source and a liquid crystal.

[0117] The light source is for example a backlight or a frontlight in a liquid crystal display device or a lamp in a liquid crystal projector.

[0118] Liquid crystal displays images by transmitting or reflecting light emitted from a light source.

[0119] The display device 10 (processor 12) dims the light source so that it blinks at approximately 40 Hz. As an example, the display device 10 may dim the light source so that the rising period of the waveform of the brightness of the light source is shorter than the falling period (for example, so that the waveform becomes a 40 Hz inverse sawtooth wave). Additionally, the display device 10 may dim the light source so that the waveform of the brightness of the light source matches any of the following: 40Hz sawtooth wave 40Hz sine wave 40Hz triangle wave 40Hz trapezoidal wave 40Hz pulse wave

[0120] As described above, the display device 10 of the second modification may include a light source and a liquid crystal capable of transmitting or reflecting light emitted from the light source. The display device 10 adjusts the light source so that it blinks at approximately 40 Hz. This allows the brightness of the image displayed on the display device 10 to increase and decrease at a cycle of approximately 40 Hz.

[0121] The display device 10 may adjust the brightness of the light source so that the rising period of the waveform of the brightness of the light source is shorter than the falling period. This is expected to increase the intensity of the stimulus given to the viewer while suppressing discomfort.

[0122] (5-3) Variation 3 A description will now be given of Modification 3. Modification 3 is an example in which the screen luminance of an image is increased and decreased at a cycle of approximately 40 Hz by an approach different from that of this embodiment and Modification 2.

[0123] Specifically, the display device 10 of the third modification may be, but is not limited to, a liquid crystal display device (which may include a liquid crystal television receiver) or a liquid crystal projector. The image display unit 15 of the display device 10 includes a light source and a liquid crystal.

[0124] The light source is for example a backlight or a frontlight in a liquid crystal display device or a lamp in a liquid crystal projector.

[0125] Liquid crystal displays images by transmitting or reflecting light emitted from a light source. The display device 10 (processor 12) controls the liquid crystal (shutter) to open and close at approximately 40 Hz. Note that a display element such as a DLP may be controlled in the same manner instead of the liquid crystal.

[0126] As described above, the display device 10 of the third modification may include a light source and a liquid crystal capable of transmitting or reflecting light emitted from the light source. The display device 10 controls the liquid crystal to open and close at approximately 40 Hz. This allows the brightness of the image displayed on the display device 10 to increase and decrease at a cycle of approximately 40 Hz.

[0127] (6) Other modifications The storage device 11 may be connected to the display device 10 via a network NW. The display device 10 of the present embodiment and each modification may also be configured as a system including a video display device and an image processing device. The image processing device may be configured as a tuner device, a signal repeater, or an STB (Set Top Box), and may have each function of the display device 10 (particularly the processor 12) of the present embodiment and each modification (for example, may execute the processing of each step of FIG. 3 and the processing of each step of FIG. 7). For example, the image processing device may be configured to obtain an input video signal having a frame rate different from 40 fps, generate video frames to be supplied to the video display unit based on the input video signal so that the screen brightness of the video displayed by the video display unit increases and decreases at a cycle of approximately 40 Hz, and output the generated video frames to the video display device. On the other hand, the video display device connected to the image processing device may be configured to include the video display unit 15 of the present embodiment and each modification, and display the video frames sent from the image processing device.

[0128] When the display device 10 is capable of displaying a left image and a right image, such as a glasses display or a naked-eye 3D display, the screen luminance may be increased or decreased at approximately 40 Hz using the left image and the right image. For example, when applying the example of FIG. 4, the display device 10 generates image frames of the left image so that a frame set including a first frame based on an input image signal for the left image and a second frame having a screen luminance different from that of the first frame is displayed at a cycle of approximately 40 Hz. The display device 10 also generates image frames of the right image so that a frame set including a first frame based on an input image signal for the right image and a second frame having a screen luminance different from that of the first frame is displayed at a cycle of approximately 40 Hz. Here, the display device 10 supplies image frames to the image display unit 15 so that the time when the first frame of the left image is displayed and the time when the first frame of the right image is displayed are shifted by approximately 1 / 80 s. This allows a visual stimulus of approximately 40 Hz to be given to each of the right and left eyes of the viewer. In addition, while the left eye sees the second frame, the right eye sees the first frame based on the input video signal, and while the right eye sees the second frame, the left eye sees the first frame based on the input video signal, so that the deterioration of smoothness of the video perceived by the viewer can be suppressed. The display cycle of each frame set of the left and right videos may be set to about 20 Hz, and the time when the first frame of the left video is displayed and the time when the first frame of the right video is displayed may be shifted by about 1 / 40 seconds. In this case, a visual stimulus of about 20 Hz is provided to each of the viewer's right and left eyes, so that the visual cortex as a whole is active at about 40 Hz.

[0129] In the above description, each frame (e.g., a bright frame and a dark frame) constituting a frame set has been described. The brightness of these frames may be fixed, or may be adjustable. As a first example, the brightness of each frame may be adjusted according to an instruction from a viewer. As a second example, the brightness of each frame may be adjusted according to the ambient light of the display device 10. In this case, the display device 10 may be equipped with an ambient light sensor. As a third example, the brightness of each frame may be adjusted according to a luminance statistic (e.g., an average) of the input video signal.

[0130] In the above description, an example in which the brightness is changed at approximately 40 Hz over the entire screen has been shown. However, the area in which such a change occurs may be limited to a part of the screen. As a first example, the display device 10 may change the brightness in the periphery of the frames constituting the frame set, or in a part in which the movement represented by the input video signal is small. This suppresses flickering in the part of the screen that the viewer focuses on. As a second example, the display device 10 may change the brightness in the center of the frames constituting the frame set, or in a part in which the movement represented by the input video signal is large. This suppresses flickering in the range captured by the peripheral vision, where flickering is thought to be more easily perceived than in the central vision.

[0131] In the above description, the frequency corresponding to gamma waves is mainly assumed to be 35 Hz or more and 45 Hz or less. However, the present invention is not limited to this, and any numerical range that affects the induction or synchronization of gamma waves in the observer's brain can be assumed as the frequency corresponding to gamma waves. For example, the frequency corresponding to gamma waves can be assumed to be 25 Hz or more and 140 Hz or less. For example, the frequency can change over time, and a frequency less than 35 Hz or a frequency higher than 45 Hz can be temporarily allowed as the frequency.

[0132] Also, the frequency corresponding to gamma waves may be adjusted according to the viewer. As a first example, when the viewer perceives flickering in response to a change in screen luminance at 40 Hz, the display device 10 may increase the frequency of the screen luminance above 40 Hz in response to a viewer instruction. As a second example, the display device 10 may determine the viewer's degree of fatigue according to a sensor input, a viewer instruction, a time period, a continuous viewing time, or an accumulated viewing time in a unit period, and increase the frequency of the screen luminance above 40 Hz in response to the degree of fatigue. This makes it difficult for the viewer to perceive flickering, thereby suppressing the viewer's discomfort.

[0133] The display device 10 may change the screen luminance with an arbitrary waveform. The display device 10 can employ, for example, any of the following waveforms. Reverse sawtooth wave Sawtooth Wave ·Sine wave ·Triangle wave Trapezoidal wave Pulse wave The display device 10 may select the waveform to be adopted based on the characteristics of a viewer, an instruction from the viewer, statistics of the luminance of the input video signal, etc. Similarly, the display device 10 may adjust the duty ratio.

[0134] In the above-mentioned embodiment, the display device 10 is mainly used as a cognitive function improvement system for improving cognitive function (for example, treatment or prevention of dementia). However, the use of the display device 10 is not limited to this. Non-Patent Document 1 discloses that inducing or synchronizing gamma waves in the brain reduces amyloid β and improves cognitive function. That is, by showing the image displayed by the display device 10 to the user, amyloid β in the user's brain is reduced and deposition is suppressed, and it is expected to be useful for preventing or treating diseases caused by an increase or deposition of amyloid β. For example, cerebral amyloid angiopathy (CAA) is an example of a disease caused by the deposition of amyloid β. CAA is a disease in which amyloid β protein is deposited on the walls of small blood vessels in the brain, making the blood vessel walls fragile and making it more likely to cause cerebral hemorrhage. As with dementia, there is no treatment for CAA itself, so the technology described in the above-mentioned embodiment can be an innovative treatment method. That is, the display device 10 can also be used as a medical system for treating or preventing cerebral amyloid angiopathy.

[0135] (7) Additional Notes The matters described in the embodiment and the modified examples are supplemented below.

[0136] (Appendix 1) a video display unit (15) that displays a video corresponding to the supplied video frame; A means for acquiring an input video signal having a frame rate different from 40 fps (frames per second) (S110); A means for generating a video frame to be supplied to the video display unit based on an input video signal so that the screen luminance of the video displayed by the video display unit increases and decreases at a cycle of approximately 40 Hz (S111); A display device (10) comprising:

[0137] (Appendix 2) The refresh rate of the video display is equal to or greater than 70 Hz and is a multiple of approximately 40 Hz. the generating means generates, based on the input video signal, a video frame to be supplied to the video display unit such that a frame set including a first frame based on the input video signal and a second frame having a screen luminance different from that of the first frame is displayed at a cycle of approximately 40 Hz; 2. A display device according to claim 1.

[0138] (Appendix 3) The second frame is a bright frame or a dark frame in which the luminance across the entire screen is substantially uniform. 3. A display device according to claim 2.

[0139] (Appendix 4) The second frame is a frame in which the luminance of the first frame is changed to be brighter or darker. 3. A display device according to claim 2.

[0140] (Appendix 5) The refresh rate is equal to or greater than 105 Hz and is approximately a multiple of 40 Hz. The frame set includes a first frame based on the input video signal, a second frame having a lower screen luminance than the first frame, and a third frame having a higher screen luminance than the first frame. 5. The display device according to claim 2,

[0141] (Appendix 6) The refresh rate is equal to or greater than 140 Hz and is approximately a multiple of 40 Hz. The frame set includes a fourth frame with a higher screen brightness than the third frame, The frames in a frameset are displayed in the following order: frame 4, frame 3, frame 1, frame 2. 6. The display device according to claim 5.

[0142] (Appendix 7) a video display unit (15) having a refresh rate of 70 Hz or more and a multiple of approximately 40 Hz, and displaying a video according to the supplied video frame; A means for acquiring an input video signal (S110); and a means (S211) for generating a video frame to be supplied to the video display unit based on the input video signal so that a frame set including a first frame based on the input video signal and a second frame corresponding to a complementary color image or a grayscale image of the first frame is displayed at a cycle of approximately 40 Hz. Display device (10).

[0143] (Appendix 8) a video display unit (15) having a refresh rate of 105 Hz or more and a multiple of approximately 40 Hz, and displaying a video according to the supplied video frame; A means for acquiring an input video signal (S110); and means (S211) for generating video frames to be supplied to the video display unit based on the input video signal so that a frame set including a first frame based on the R signal of the input video signal, a second frame based on the G signal of the input video signal, and a third frame based on the B signal of the input video signal is displayed at a cycle of approximately 40 Hz. Display device (10).

[0144] (Appendix 9) a video display unit (15) having a refresh rate of 70 Hz or more and a multiple of approximately 40 Hz, and displaying a video according to the supplied video frame; A means for acquiring an input video signal (S110); and means (S211) for generating, based on the input video signal, a video frame to be supplied to the video display unit such that a frame set including a first frame based on the R signal and the B signal of the input video signal and a second frame based on the G signal of the input video signal is displayed at a cycle of approximately 40 Hz. Display device (10).

[0145] (Appendix 10) A light source; means for dimming the light source to blink at approximately 40 Hz; A liquid crystal capable of transmitting or reflecting light emitted from a light source; A display device (10) comprising:

[0146] (Appendix 11) The dimming means dims the light source so that a rising period of a waveform of the brightness of the light source is shorter than a falling period. 11. The display device according to claim 10.

[0147] (Appendix 12) A light source; A liquid crystal capable of transmitting or reflecting light emitted from a light source; A means for controlling the liquid crystal to open and close at approximately 40 Hz. Equipped with Display device (10).

[0148] (Appendix 13) A computer (10), acquiring an input video signal having a frame rate different from 40 fps (frames per second) (S110); A step (S111) of generating a video frame to be supplied to a video display unit based on an input video signal so that the screen luminance of the video displayed by the video display unit (15), which displays a video corresponding to the supplied video frame, increases and decreases at a cycle of approximately 40 Hz; A method for performing.

[0149] (Appendix 14) A computer (10), A means for acquiring an input video signal having a frame rate different from 40 fps (frames per second) (S110); A means for generating a video frame to be supplied to a video display unit (15) based on an input video signal so that the screen luminance of the video displayed by the video display unit (15) that displays a video corresponding to the supplied video frame increases and decreases at a cycle of approximately 40 Hz (S111). A program that functions as a

[0150] (Appendix 15) A system (10) including a video display device and an image processing device, The video display device has a video display unit (15) that displays a video corresponding to the supplied video frame, The image processing device includes: A means for acquiring an input video signal having a frame rate different from 40 fps (frames per second) (S110); A means (S111) for generating a video frame to be supplied to the video display unit based on an input video signal so that the screen luminance of the video displayed by the video display unit increases and decreases at a cycle of approximately 40 Hz; A means for outputting the generated video frame to the video display device (S112); Equipped with system.

[0151] Although the embodiment of the present invention has been described in detail above, the scope of the present invention is not limited to the above embodiment. Furthermore, the above embodiment can be improved or modified in various ways without departing from the spirit of the present invention. Furthermore, the above embodiment and the modified examples can be combined. [Explanation of symbols]

[0152] 10:Display device 11:Storage device 12: Processor 13: Input / Output Interface 14: Communication interface 15: Video display section

Claims

1. a video display unit that displays a video corresponding to the supplied video frame; A means for acquiring an input video signal having a frame rate different from 40 fps (frames per second); means for generating the video frame to be supplied to the video display unit based on the input video signal so that the screen luminance of the video displayed by the video display unit increases and decreases at a cycle of approximately 40 Hz; A display device comprising:

2. The refresh rate of the video display unit is equal to or greater than 70 Hz and is a multiple of approximately 40 Hz; the generating means generates the video frames to be supplied to the video display unit based on the input video signal so that a frame set including a first frame based on the input video signal and a second frame having a screen luminance different from that of the first frame is displayed at a cycle of approximately 40 Hz. The display device according to claim 1 .

3. The second frame is a bright frame or a dark frame in which the luminance of the entire screen is substantially uniform. The display device according to claim 2 .

4. The second frame is a frame obtained by changing the luminance of the first frame to be brighter or darker. The display device according to claim 2 .

5. the refresh rate is greater than or equal to 105 Hz and is a multiple of approximately 40 Hz; the frame set includes the first frame based on the input video signal, the second frame having a lower screen luminance than the first frame, and a third frame having a higher screen luminance than the first frame. The display device according to claim 2 .

6. the refresh rate is greater than or equal to 140 Hz and is a multiple of approximately 40 Hz; the frame set includes a fourth frame having a screen brightness higher than that of the third frame, the plurality of frames included in the frame set are displayed in the order of the fourth frame, the third frame, the first frame, and the second frame; The display device according to claim 5 .

7. a video display unit having a refresh rate equal to or higher than 70 Hz and substantially a multiple of 40 Hz, and displaying a video corresponding to the supplied video frame; A means for acquiring an input video signal; a means for generating, based on the input video signal, the video frames to be supplied to the video display unit such that a frame set including a first frame based on the input video signal and a second frame corresponding to a complementary color image or a grayscale image of the first frame is displayed at a frequency of approximately 40 Hz; Display device.

8. a video display unit having a refresh rate of 105 Hz or more and a multiple of approximately 40 Hz, and displaying a video according to the supplied video frame; A means for acquiring an input video signal; means for generating video frames to be supplied to the video display unit based on the input video signal such that a frame set including a first frame based on an R signal of the input video signal, a second frame based on a G signal of the input video signal, and a third frame based on a B signal of the input video signal is displayed at a cycle of approximately 40 Hz; Display device.

9. a video display unit having a refresh rate equal to or higher than 70 Hz and substantially a multiple of 40 Hz, and displaying a video corresponding to the supplied video frame; A means for acquiring an input video signal; means for generating video frames to be supplied to the video display unit based on the input video signal such that a frame set including a first frame based on the R signal and the B signal of the input video signal and a second frame based on the G signal of the input video signal is displayed at a cycle of approximately 40 Hz; Display device.

10. A light source; A means for dimming the light source so as to blink at approximately 40 Hz; A liquid crystal capable of transmitting or reflecting light emitted from the light source; A display device comprising:

11. the dimming means dims the light source so that a rising period of a waveform of the brightness of the light source is shorter than a falling period of the waveform. The display device according to claim 10.

12. A light source; A liquid crystal capable of transmitting or reflecting light emitted from the light source; A means for controlling the liquid crystal to open and close at approximately 40 Hz; Equipped with Display device.

13. The computer obtaining an input video signal having a frame rate different from 40 frames per second (fps); generating a video frame to be supplied to a video display unit based on the input video signal so that a screen luminance of a video displayed by the video display unit, which displays a video corresponding to the supplied video frame, increases and decreases at a cycle of approximately 40 Hz; A method for performing.

14. Computer, A means for acquiring an input video signal having a frame rate different from 40 frames per second (fps); a means for generating, based on the input video signal, a video frame to be supplied to a video display unit, so that the screen luminance of a video displayed by the video display unit, which displays a video corresponding to the supplied video frame, increases and decreases at a cycle of approximately 40 Hz; A program that functions as a

15. A system including a video display device and an image processing device, the video display device has a video display unit that displays a video corresponding to the supplied video frame, The image processing device includes: A means for acquiring an input video signal having a frame rate different from 40 fps (frames per second); means for generating the image frame to be supplied to the image display unit based on the input image signal so that the screen luminance of the image displayed by the image display unit increases and decreases at a cycle of approximately 40 Hz; means for outputting the generated video frame to the video display device; Equipped with system.

Images