JP2019124798A - Display device, display device control method and program, and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of reducing moving image blur while suppressing visual recognition of a double image in a display device in which two display panels are overlapped. SOLUTION: The display device of the present invention has a first determination means for determining the presence or absence of movement of an image in input image data, and a spatial reduction degree of the input image data based on the determination result of the first determination means. From a processing means that generates processed image data by reduction processing that reduces the intensity of high-frequency components, a first panel that displays a first image by outputting light based on the processed image data, and the first panel. It has a second panel for displaying a second image by transmitting the output light based on the input image data, and the processing means is determined by the first determination means to have the movement. In this case, a lower degree of reduction is used as compared with the case where the first determination means determines that there is no movement. [Selection diagram] Fig. 2

Description

  The present invention relates to a display device, a control method of the display device, a program, and a storage medium.

  As a structure for realizing high contrast display of a liquid crystal display device, there is a double liquid crystal structure. With a dual liquid crystal structure, using two stacked liquid crystal panels as a liquid crystal panel that transmits light emitted from a backlight unit achieves a contrast display that is significantly higher than a structure using a single liquid crystal panel it can.

  In the double liquid crystal structure, a space is often provided between the liquid crystal panels in order to prevent the damage (the damage of the liquid crystal panels) due to the contact between the liquid crystal panels. Further, since each liquid crystal panel has a structure in which the liquid crystal layer is sandwiched between two glass plates, two liquid crystal layers respectively corresponding to the two liquid crystal panels are provided even if no space is provided between the liquid crystal panels. There is a space between them. Due to these spaces, when the liquid crystal display device is viewed from an oblique direction, two images displayed at the same position on two liquid crystal panels appear as double images at different positions, and the image visibility is reduced. Sometimes. This phenomenon is noticeable when the intensity of the high frequency component of the image is high. The “image with high intensity of high frequency components” can be said to be an “image with steep gradation steps”, and is, for example, text (characters and numbers).

  There has also been proposed a display device in which a self-emission panel is superimposed on a liquid crystal panel so that the output light of the self-emission panel (such as an organic EL panel) is viewed through the liquid crystal panel. Even with this display device, high contrast display can be realized, but double images may be viewed.

  The prior art for suppressing the visual recognition of double images is disclosed, for example, in Patent Document 1. Here, among the two liquid crystal panels, the liquid crystal panel closer to the backlight unit is described as a "back panel", and the other liquid crystal panel is described as a "front panel". In the technology disclosed in Patent Document 1, the state of the back panel is controlled to the transmissive state in a region including the transmissive region in which the state of the front panel is in the transmissive state and one size larger than the transmissive region.

JP, 2010-14989, A

  However, in the technology disclosed in Patent Document 1, when the display device displays a moving image, moving image blur such as tailing is displayed.

  An object of the present invention is to provide a technology capable of reducing motion blur while suppressing visual recognition of double images in a display device in which two display panels are superimposed.

The first aspect of the present invention is
First determining means for determining presence or absence of movement of an image in input image data;
Processing means for generating processed image data by reduction processing for reducing the intensity of the spatial high-frequency component of the input image data with a reduction degree based on the determination result of the first determination means;
A first panel for displaying a first image by outputting light based on the processed image data;
A second panel that displays a second image by transmitting light output from the first panel based on the input image data;
Have
A display characterized in that the processing means uses, when the first judgment means judges that there is the movement, a reduction degree lower than when the first judgment means judges that there is no movement. It is an apparatus.

The second aspect of the present invention is
A backlight module that emits light to the front side,
A first panel provided on the front side of the backlight module and transmitting light emitted from the backlight module;
A second panel provided on the front side of the first panel to further transmit light transmitted through the first panel to display an image on a screen;
The light transmittance of the first panel is controlled using first control image data based on image data, and the light transmittance of the second panel is controlled using second control image data based on the image data Control means,
The image data is subjected to image processing including predetermined processing for reducing the intensity of the spatial high frequency component, and generation means for generating the second control image data.
The generation unit executes the predetermined processing under a first processing condition when the image data is moving image data, and the first processing condition is different from the first processing condition when the image data is still image data. (2) A display device characterized in that the predetermined processing is executed under processing conditions.

The third aspect of the present invention is
A first panel for displaying a first image by outputting light based on processed image data generated from input image data;
A second panel that displays a second image by transmitting light output from the first panel based on the input image data;
A control method of a display device having
A determination step of determining presence or absence of movement of an image in the input image data;
A processing step of generating the processed image data by a reduction process of reducing the intensity of the spatial high frequency component of the input image data according to the reduction degree based on the judgment result of the judgment step;
Have
In the control step, when it is determined in the determination step that there is the movement, a control method characterized by using a lower reduction degree than in the case where it is determined in the determination step that there is no movement.

The fourth aspect of the present invention is
A backlight module that emits light to the front side,
A first panel provided on the front side of the backlight module and transmitting light emitted from the backlight module;
A second panel provided on the front side of the first panel to further transmit light transmitted through the first panel to display an image on a screen;
A control method of a display device having
The light transmittance of the first panel is controlled using first control image data based on image data, and the light transmittance of the second panel is controlled using second control image data based on the image data Control step,
The image data is subjected to image processing including predetermined processing for reducing the intensity of the spatial high-frequency component to generate the second control image data;
In the generation step, when the image data is moving image data, the predetermined processing is executed under a first processing condition, and when the image data is still image data, a first processing condition different from the first processing condition is generated. (2) A control method characterized in that the predetermined process is executed under process conditions.

  A fifth aspect of the present invention is a program for causing a computer to execute each step of the control method described above. A sixth aspect of the present invention is a computer readable storage medium storing a program for causing a computer to execute each step of the control method described above.

  According to the present invention, in a display device in which two display panels are superimposed, it is possible to reduce moving image blur while suppressing visual recognition of a double image.

FIG. 1 is a schematic view showing an example of the structure of a display device according to a first embodiment. FIG. 2 is a schematic view showing an example of a functional configuration of a display device according to a first embodiment. FIG. 7 is a schematic view showing an example of the operation of the display device according to the first embodiment. FIG. 6 is a schematic view showing an example of the degree of reduction of high frequency components according to the first embodiment. FIG. 7 is a schematic view showing an example of a functional configuration of a display device according to a second embodiment. FIG. 13 is a schematic view showing an example of the operation of the display device according to the second embodiment. FIG. 13 is a schematic view showing an example of the operation of the display device according to the second embodiment. FIG. 8 is a schematic view showing an example of the high frequency component reduction degree according to the second embodiment.

Example 1
Hereinafter, Example 1 of the present invention will be described.

<Structure of Display Device>
FIG. 1 is a schematic view showing an example of the structure of a display device 100 according to the present embodiment. The display device 100 includes a front panel 112, a back panel 111, and a backlight unit (backlight module) 101. Hereinafter, the direction from the backlight unit 101 toward the display surface (the surface viewed by the user) will be described as the front direction. The back panel 111 is a liquid crystal panel provided on the front side (front side) with respect to the backlight unit 101, and the front panel 112 is a liquid crystal panel provided on the front side with respect to the back panel 111. The light emitted from the backlight unit 101 is transmitted through the back panel 111 and the front panel 112 in that order, whereby an image is displayed on the display surface. In FIG. 1, an optical sheet 102 such as a diffusion sheet is provided between the front panel 112 and the back panel 111 in order to prevent moiré. In addition, the display device 100 includes an exterior bezel, a power supply, an electronic substrate, an operation key, and the like as members (not illustrated).

  Each of the back panels 111 of the front panel 112 may be a transmissive display panel, and may not be a liquid crystal panel. For example, at least one of the back panel 111 of the front panel 112 may be a display panel of a micro electro mechanical system (MEMS) shutter method. The optical sheet 102 may not be provided. A predetermined space may be provided between the front panel 112 and the back panel 111 in order to prevent moiré.

<Functional Configuration of Display Device>
FIG. 2 is a schematic diagram showing an example of a functional configuration of the display device 100. As shown in FIG. The display device 100 includes an input unit 201, an image quality adjustment unit 202, luminance data generation units 203a and 203b, a one-frame delay unit 204, a motion determination unit 205, an image processing unit 206, a front panel 112, a back panel 111, and a backlight. A unit 101 is included. The input unit 201, the image quality adjustment unit 202, the luminance data generation units 203a and 203b, the one-frame delay unit 204, the motion determination unit 205, and the image processing unit 206 are mounted on an electronic substrate as an electronic circuit.

  The input unit 201 acquires input image data 210. The input image data 210 is, for example, image data of the High Definition Multimedia Interface (HDMI) system. The input unit 201 converts the data format of the input image data 210 into a data format that can be processed inside the display device 100 as necessary. Instead of the input image data 210, other image data (such as image data stored in the display device 100) may be acquired and used.

  The image quality adjustment unit 202 generates adjustment image data by performing predetermined image quality adjustment processing on the input image data 210. The predetermined image quality adjustment processing includes scaling (enlargement or reduction), interlace / progressive conversion, brightness adjustment, contrast adjustment, color density adjustment, hue adjustment, and the like. In addition, when the input image data 210 is image data including color difference data (such as YCbCr data), the image quality adjustment unit 202 converts the input image data 210 into RGB data. Thus, RGB data is obtained as adjusted image data. The display device 100 may not have the image quality adjustment unit 202.

  The one-frame delay unit 204 is configured by a memory or the like, and delays the adjusted image data by one frame time. For example, when the N-th (N is an integer of 2 or more) frame is input to the one-frame delay unit 204, the (N−1) th frame is output from the one-frame delay unit 204.

  The luminance data generation unit 203 a generates luminance data from the adjusted image data (RGB data) before being delayed by the one-frame delay unit 204. The luminance data generation unit 203 b generates luminance data from the adjusted image data (RGB data) delayed by the one-frame delay unit 204. The luminance data generation unit 203b generates luminance data by delaying the luminance data generated by the luminance data generation unit 203a by one frame time.

  The motion determination unit 205 compares the luminance data generated by the luminance data generation unit 203 a with the luminance data generated by the luminance data generation unit 203 b to determine the presence or absence of image movement in the input image data 210. For example, the motion determination unit 205 determines whether the input image data 210 is moving image data or still image data.

  The image processing unit 206 determines the strength of the spatial high-frequency component of the input image data 210 (specifically, the adjusted image data delayed by the one-frame delay unit 204) with a reduction degree based on the determination result of the motion determination unit 205. Processed image data is generated by the reduction processing to be reduced. The high frequency component can be said to be a range above a predetermined spatial frequency. In the reduction process, the intensity of all spatial frequencies may be reduced, or only the intensity of some or all of the plurality of spatial frequencies corresponding to the spatial high frequency component may be reduced.

In the present embodiment, the image quality adjustment unit 202 performs predetermined image quality adjustment processing, and the image processing unit 206 performs predetermined reduction processing for reducing the intensity of the spatial high frequency component. Adjustment image data (first control image data) is generated by performing image processing (predetermined image quality adjustment processing) that does not include predetermined reduction processing on the input image data 210. Then, processed image data (second control image data) is generated by performing image processing (predetermined image quality adjustment processing and predetermined reduction processing) including predetermined reduction processing on the input image data 210.

  The backlight unit 101 is a light emitting unit that emits light to the front side.

  The back panel 111 displays an image (back image) by outputting light based on the processed image data. In this embodiment, the back panel 111 displays a back image by transmitting the light (irradiated) emitted from the backlight unit 101 based on the processed image data. Specifically, the back panel 111 has a control circuit that controls the light transmittance of the back panel 111. The control circuit of the back panel 111 controls the light transmittance of the back panel 111 using the processed image data. Then, the light emitted from the backlight unit 101 is transmitted through the back panel 111 to display a back image.

  The front panel 112 displays an image by transmitting the light output from the back panel 111 based on the input image data 210 (specifically, adjusted image data delayed by the one-frame delay unit 204). In the present embodiment, the front panel 112 further transmits the light transmitted through the back panel 111 to display an image on the display surface (screen). Specifically, the front panel 112 has a control circuit that controls the light transmittance of the front panel 112. The control circuit of the front panel 112 uses the adjusted image data to transmit the light transmittance of the front panel 112 so that an image (front image) based on the adjusted image data delayed by the one-frame delay unit 204 is drawn. Control. Then, the light transmitted through the back panel 111 is further transmitted through the front panel 112, whereby a composite image obtained by combining the back image and the front image is displayed. The composite image is equivalent to the image displayed on the display surface. The control circuit of the front panel 112 may be integrated with the control circuit of the back panel 111.

  A specific example of the process of the movement determination unit 205 will be described. When the luminance data generation unit 203a obtains luminance data of the Nth frame, the luminance data generation unit 203b obtains luminance data of the (N-1) th frame. In this case, the motion determination unit 205 calculates the average luminance of the frame from the luminance data of the Nth frame, and calculates the average luminance of the frame from the luminance data of the (N-1) th frame. The average luminance is, for example, an average of relative luminances having a lower limit of 0% and an upper limit of 100%. Then, the motion determination unit 205 determines that “motion is present” when the difference between the two average luminances is larger than a predetermined threshold (for example, relative luminance 25%), and the difference is equal to or less than the predetermined threshold. "No movement" is judged. When the image quality adjustment unit 202 determines the motion of the image for interlace / progressive conversion, the determination result of the image quality adjustment unit 202 is used instead of the determination result of the motion determination unit 205. It is also good.

  A specific example of the process of the image processing unit 206 will be described. In a display device in which two display panels are superimposed, when the display device is viewed from an oblique direction, two images displayed at the same position on the two display panels appear as double images at different positions. There is. The image processing unit 206 reduces the intensity of the spatial high-frequency component of the input image data 210 (specifically, the adjusted image data delayed by the one-frame delay unit 204) to obtain the double image as described above. Reduce the visibility of

For example, the image processing unit 206 converts, for each pixel of the input image data 210, the gradation value of the target pixel into the average gradation value of the reference area including the target pixel. Here, for the pixel at coordinates (horizontal position, vertical position) = (A, B), the R value Rin of the adjusted image data delayed by the one-frame delay unit 204 is described as “R value Rin (A, B)”. The R value Rout of the processed image data is described as "R value Rout (A, B)". The image processing unit 206 converts the R value Rin (X, Y) into the R value Rout (X, Y) using, for example, the following Expression 1. “N” in Expression 1 is an integer of 1 or more, and the larger the “n”, the larger the reference region, the greater the degree of reduction in the intensity of the spatial high frequency component, and the greater the degree of suppression of double image recognition. According to Equation 1, an area consisting of 2n + 1 pixels continuous in the horizontal direction centering on the target pixel is used as a reference area, the intensity of the high frequency component in the horizontal direction is reduced, and visual recognition of the double image in the horizontal direction Is suppressed. The image processing unit 206 similarly calculates the G value and the B value of the processed image data. Hereinafter, such processing is referred to as “additional averaging processing”.

Rout (X, Y) = (Rin (X-n, Y)
+ Rin (X-n + 1, Y) + ...
+ Rin (X, Y) + ...
+ Rin (X + n-1, Y)
+ Rin (X + n, Y)) / (2n + 1) (Equation 1)

  The reduction processing for reducing the intensity of the spatial high frequency component is not limited to the averaging processing. For example, the image processing unit 206 may perform low-pass filter processing as reduction processing. When the cutoff frequency of the low pass filter processing is equal to or higher than the minimum spatial frequency corresponding to the spatial high frequency component, the lower the cutoff frequency, the lower the degree of reduction of the intensity (average intensity etc.) of the spatial high frequency component. The degree of suppression of double image recognition is large.

<Operation of Display Device>
FIG. 3 is a schematic view showing an example of the operation of the display device 100. As shown in FIG. FIG. 3 shows temporal changes of the input image 311, the motion determination result 312, the high frequency component reduction degree 313, the front image 314, the back image 315, and the composite image 316. The input image 311 is an image represented by the input image data 210. The movement determination result 312 is a determination result of the movement determination unit 205. The high-frequency component reduction degree 313 is the reduction degree of the reduction processing performed by the image processing unit 206 (the reduction degree of the strength of the spatial high-frequency component). The high frequency component reduction degree 313 can also be said to be the “degree of suppression of double image visual recognition”. Here, for the sake of simplicity, it is assumed that the predetermined image quality adjustment processing by the image quality adjustment unit 202 is omitted, and the input image data 210 is used as adjustment image data.

  In the example of FIG. 3, the input image 311 is an image in which a white rectangle is arranged on a black background. In the period of frames 301 to 303, the rectangle is stationary at the center of the input image 311, and in the period of frames 304 to 307, the rectangle moves from the center of the input image 311 toward the right.

  The motion determination unit 205 calculates, for each frame, the difference (average luminance difference) between the average luminance of the target frame (average luminance of the input image 311) and the average luminance of the immediately preceding frame of the target frame. Then, for each frame, the motion determining unit 205 determines that “motion is present” when the average luminance difference is larger than a predetermined threshold, and determines “not moving” when the average luminance difference is equal to or less than the predetermined threshold. Do.

For example, the motion determination unit 205 obtains the motion determination result 312 (presence or absence of motion) with respect to the frame 302 in accordance with the average luminance difference between the frame 302 and the frame 301. Motion judgment results 312 for other frames can be obtained as well. In the example of FIG. 3, since the average luminance of the frame 302 is the same as the average luminance of the frame 301, “no motion” is obtained as the motion determination result 312 for the frame 302. Similarly, “no motion” is obtained as the motion judgment result 312 for the frame 303. On the other hand, since the average luminance of the frame 304 is different from the average luminance of the frame 303, and the average luminance difference between the frame 304 and the frame 303 is larger than a predetermined threshold, can get. Similarly, for each of the frames 305 to 307, the motion judgment result 312 "with motion" is obtained.

  The front image 314 is an image drawn on the front panel 112 based on the input image 311 (input image data 210). The front image 314 can also be referred to as “an image displayed on the display surface when the transmittance of the back panel 111 is 100% over the entire display surface”. The input image 311 is delayed by one frame time by the one frame delay unit 204. Therefore, the front image 314 of each frame corresponds to the input image 311 of the previous frame. In the example of FIG. 3, the front image 314 of each frame is the input image 311 of the previous frame. Therefore, the front image 314 of the frame 302 is the input image 311 of the frame 301, and the front image 314 of the frame 303 is the input image 311 of the frame 302. Similarly, the front image 314 of another frame is the input image 311 of the previous frame.

  The back image 315 is an image drawn on the back panel 111 based on the processed image (processed image data) generated by the image processing unit 206. The back image 315 can also be referred to as “an image displayed on the display surface when the transmittance of the front panel 112 is 100% over the entire display surface”. As described above, the input image 311 is delayed by one frame time by the one frame delay unit 204. Therefore, the back image 315 of each frame corresponds to the input image 311 of the previous frame. In addition, the processed image is generated by reduction processing for reducing the intensity of the spatial high frequency component of the input image 311. Therefore, the width of the rectangle in the back image 315 is wider than the width of the rectangle in the input image 311.

  FIG. 4 is a schematic view showing an example of the correspondence between the motion determination result 312 and the high frequency component reduction degree 313. As shown in FIG. In the present embodiment, when the input image data 210 is moving image data, the image processing unit 206 executes predetermined reduction processing under the first processing condition, and when the input image data 210 is still image data, The predetermined reduction processing is executed under a second processing condition different from the first processing condition. Specifically, as shown in FIG. 4, when the motion determination result 312 is “with motion”, the image processing unit 206 reduces high frequency components lower than when the motion determination result 312 is “without motion”. The degree 313 is used. When the reduction processing for reducing the strength of the spatial high-frequency component is addition averaging processing, the image processing unit 206 changes the high-frequency component reduction degree 313 by changing the size of the reference region. For example, when the motion determination result 312 is “with motion”, the image processing unit 206 uses a smaller reference area as compared to the case where the motion determination result 312 is “with no motion”. Specifically, as shown in FIG. 4, when the motion determination result 312 is “with motion”, the image processing unit 206 has a smaller value than when the motion determination result 312 is “with no motion”, Used as "n" of Formula 1. When the reduction processing for reducing the intensity of the spatial high frequency component is low pass filter processing, the image processing unit 206 changes the high frequency component reduction degree 313 by changing the cutoff frequency of the low pass filter processing. Specifically, as shown in FIG. 4, when the motion determination result 312 is “with motion”, the image processing unit 206 has a frequency higher than that when the motion determination result 312 is “with no motion”. Used as a cutoff frequency. As described above, in the present embodiment, the difference between the first processing condition and the second processing condition includes the difference in the high frequency component reduction degree 313, the difference in the size (size) of the reference region, the difference in the cutoff frequency, and the like. . Then, the intensity of the spatially high frequency component of the processed image data subjected to the predetermined reduction processing under the first processing condition is the spatially high frequency component of the processed image data subjected to the predetermined reduction processing under the second processing condition Higher than the strength of Note that the image processing unit 206 may execute predetermined reduction processing when it is determined that "no motion", instead of executing predetermined reduction processing when it is determined that "movement is present".

In the example of FIG. 3, the motion determination result 312 is “no motion” in the period of the frames 302 and 303, and the motion determination result 312 is “motion in the period” in the frames 304 to 307. Therefore, the high frequency component reduction degree 313 in the periods of the frames 304 to 307 is lower than the high frequency component reduction degree 313 in the periods of the frames 302 and 303. As a result, the width of the rectangle in the back image 315 of the frames 304-307 is narrower than the width of the rectangle in the back image 315 of the frames 302 and 303.

  The composite image 316 is an image obtained by combining the front image 314 and the back image 315, and is an image displayed on the display surface. As described above, the input image 311 is delayed by one frame time by the one frame delay unit 204. Therefore, the composite image 316 of each frame corresponds to the input image 311 of the previous frame. As described above, since the high frequency component reduction degree 313 in the period of the frames 302 and 303 is high, in the periods of the frames 302 and 303, the composite image 316 in which visual recognition of the double image is sufficiently suppressed is displayed. Then, as described above, since the high frequency component reduction degree 313 in the period of the frames 304 to 307 is low, in the period of the frames 304 to 307, the composite image 316 in which visual recognition of double images is suppressed and moving image blur is reduced is displayed. Be done.

<Summary>
As described above, according to the present embodiment, the degree of reduction of the degree of reduction of the intensity of the spatial high-frequency component is lower when it is determined that “motion is present” than when it is determined that “motion is not present”. Used as As a result, in a display device in which two display panels are superimposed, it is possible to reduce moving image blur while suppressing visual recognition of double images.

Example 2
Hereinafter, Example 2 of the present invention will be described. There is a display panel in which the response speed changes depending on the time change of the input gradation value. If the response speed of the display panel changes, the response time of the display panel also changes. The response speed of the display panel is the speed at which the state of the display panel changes to the state corresponding to the gradation value after the change, and the response time of the display panel corresponds to the state corresponding to the gradation value after the change. It is the time it takes for the condition to change. Therefore, the response time of the display panel is longer as the response speed of the display panel is lower, and the response time of the display panel is shorter as the response speed of the display panel is higher. Then, not only due to the reduction of the intensity of the spatial high frequency component, but also due to the low response speed of the display panel (long response time of the display panel), the motion blur occurs.

  In this embodiment, in the case where at least one of the front panel and the back panel has the characteristic that the response speed changes depending on the time change of the input gradation value, an example in which the motion blur can be further reduced will be described. . In the present embodiment, in the above characteristics, when the time change of the gradation value input to the display panel is large (for example, the time change from black to white), the response speed of the display panel is high. Assume that response time is short. In the above characteristics, when the time change of the gradation value input to the display panel is small (for example, the time change from dark gray to light gray), the response speed of the display panel is low, and the response of the display panel Suppose that time is long. In the following, the points (structure and processing) different from the first embodiment will be described in detail, and the description of the same points as the first embodiment will be omitted.

<Structure of Display Device>
The structure of the display device according to the present embodiment is the same as that of the first embodiment (FIG. 1).

<Functional Configuration of Display Device>
FIG. 5 is a schematic view showing an example of a functional configuration of the display device 200 according to the present embodiment. In FIG. 5, the same functional units as those of the first embodiment (FIG. 2) are denoted by the same reference numerals as those of the first embodiment. The display device 200 further includes a gradation change determination unit 601, and includes a motion determination unit 602 and an image processing unit 603 instead of the motion determination unit 205 and the image processing unit 206 of the first embodiment. In the present embodiment, a plurality of processing areas are predetermined as a plurality of image areas in the input image data 210. In this embodiment, it is assumed that, as a plurality of processing areas, a plurality of divided areas constituting the entire image area of the input image data 210 are determined in advance. Specifically, it is assumed that a total of 12 divided areas of 4 horizontal directions × 3 vertical directions are predetermined.

  The gradation change determination unit 601 compares the two luminance data generated by the luminance data generation units 203a and 203b with each other, and corresponds to the time change of the gradation value of the input image data 210. The front panel 112 and the back panel 111 The response speed of at least one of In the present embodiment, the gradation change determination unit 601 individually determines the response speed for each of the plurality of divided areas (a plurality of processing areas).

  Here, the luminance data generation unit 203a obtains luminance data (N luminance data) of the Nth frame, and the luminance data generation unit 203b generates luminance data (N-1 luminance data) of the N-1th frame. Consider the case where it can be obtained. In this case, the gradation change determination unit 601 calculates, for each of the plurality of divided areas, the average luminance of the N luminance data in the target divided area and the average luminance of the N-1 luminance data in the target divided area. . Then, the gradation change determination unit 601 determines the gradation of the input image data 210 according to the difference (average luminance difference) between the two average luminances calculated for the target divided area for each of the plurality of divided areas. Determine magnitude of time change of value, response speed, etc. Specifically, when the average luminance difference is larger than a predetermined first threshold (for example, relative luminance 50%), the gradation change determination unit 601 determines that “the gradation change: large”, and the average luminance difference is predetermined. If the difference is smaller than or equal to the first threshold value, it is determined that "gradation change: small". “Gradation change: large” corresponds to large time change of the gradation value of the input image data 210, high response speed, and the like. The “gradation change: small” corresponds to the fact that the time change of the gradation value of the input image data 210 is small, the response speed is low, and the like.

  Similar to the motion determination unit 205 of the first embodiment, the motion determination unit 602 determines the presence or absence of the motion of the image in the input image data 210. However, the movement determination unit 602 determines the presence or absence of movement individually for each of the plurality of divided areas (a plurality of processing areas). In the present embodiment, the motion determination unit 602 calculates an average luminance difference for each of the plurality of divided areas, as in the gradation change determination unit 601. Then, the motion determination unit 602 determines, for each of the plurality of divided regions, the presence or absence of the motion according to the average luminance difference calculated for the target divided region. Specifically, when the average luminance difference is larger than a predetermined second threshold (for example, relative luminance 25%), the movement determining unit 602 determines that “movement is present”, and the average luminance difference is equal to or less than the predetermined second threshold If it is determined that there is no movement.

  Similar to the image processing unit 206 of the first embodiment, the image processing unit 603 generates processed image data by reduction processing for reducing the intensity of the spatial high-frequency component of the input image data 210. However, the image processing unit 603 individually determines the reduction degree of the intensity of the spatial high-frequency component for each of the plurality of divided areas (a plurality of processing areas). Specifically, for each of the plurality of divided regions, the image processing unit 603 is based on the determination result of the gradation change determination unit 601 for the target divided region and the determination result of the motion determination unit 602 for the target divided region. To determine the degree of reduction.

<First Operation of Display Device>
FIG. 6 is a schematic view showing an example of the operation of the display device 200. As shown in FIG. 6, the input image 711, the motion judgment result 712, the gradation change judgment result 713, the high frequency component reduction degree 714, the front image data 715, the front image 716, the back image data 717, the back image 718, and the composite image 719 The change over time of is shown. The gradation change determination result 713 is a determination result of the gradation change determination unit 601, the front image data 715 is image data input to the front panel 112, and the back image data 717 is input to the back panel 111. Image data. Here, it is assumed that each of the front panel 112 and the back panel 111 has the characteristic that the response speed changes depending on the time change of the input gradation value. Therefore, the front image data 715 and the front image 716 are distinguished, and the back image data 717 and the back image 718 are distinguished. Here, for the sake of simplicity, it is assumed that the predetermined image quality adjustment processing by the image quality adjustment unit 202 is omitted, and the input image data 210 is used as adjustment image data.

  In the example of FIG. 6, the input image 711 is an image in which a white rectangle is arranged on a black background. In the period of frames 701 to 703, the rectangle is stationary at the center of the input image 711, and in the period of frames 704 to 707, the rectangle moves from the center of the input image 711 toward the right.

  The motion determination unit 602 obtains, for each frame, a plurality of motion determination results 712 respectively corresponding to a plurality of divided areas. Here, an example of processing for a divided area (focus area) indicated by a thick line will be described. For example, the motion determination unit 602 obtains a motion determination result 712 for the focus area of the frame 702 according to the average luminance difference (difference in average luminance of the input image 711) of the focus area between the frame 702 and the frame 701. Motion judgment results 712 for other frames and other divided regions are obtained similarly. In the example of FIG. 6, the average luminance of the attention area of the frame 702 is the same as the average luminance of the attention area of the frame 701. Therefore, “no motion (static)” is obtained as the motion determination result 712 for the attention area of the frame 702. Similarly, for each of the frames 703 and 707, “no motion” is obtained as the motion determination result 712 for the attention area. On the other hand, the average luminance of the attention area of the frame 704 is different from the average luminance of the attention area of the frame 703, and the average luminance difference of the attention area between the frame 704 and the frame 703 is larger than a predetermined second threshold. Therefore, “motion (motion)” is obtained as the motion determination result 712 for the attention area of the frame 704. Similarly, for each of the frames 705 and 706, "with motion" is obtained as the motion judgment result 712 for the attention area.

  The gradation change determination unit 601 obtains, for each frame, a plurality of gradation change determination results 713 respectively corresponding to a plurality of divided areas. Here, a processing example for the attention area indicated by a thick line will be described. For example, according to the average luminance difference (difference in average luminance of the input image 711) of the attention area between the frame 702 and the frame 701, the gradation change judgment unit 601 judges the gradation change judgment result 713 for the attention area of the frame 702. Get The gradation change determination result 713 for another frame or another divided area is also obtained in the same manner. In the example of FIG. 6, the average luminance of the attention area of the frame 702 (average luminance of the input image 711) is the same as the average luminance of the attention area of the frame 701. Therefore, “gradation change: small” is obtained as the gradation change determination result 713 for the target area of the frame 702. Similarly, for each of the frames 703 and 707, “tone change: small” is obtained as the tone change judgment result 713 for the region of interest. On the other hand, the average luminance of the attention area of the frame 704 is different from the average luminance of the attention area of the frame 703, and the average luminance difference of the attention area between the frame 704 and the frame 703 is larger than a predetermined first threshold. Therefore, “gradation change: large” is obtained as the gradation change determination result 713 for the target area of the frame 704. Similarly, for each of the frames 705 and 706, “gradation change: large” is obtained as the gradation change determination result 713 for the region of interest.

The front image data 715 is image data output from the one-frame delay unit 204 to the front panel 112. The front image data 715 of each frame corresponds to the input image 711 of the previous frame. In the example of FIG. 6, the front image data 715 of each frame represents the input image 711 of the previous frame. Therefore, the front image data 715 of the frame 702 represents the input image 711 of the frame 701, and the front image data 715 of the frame 703 represents the input image 711 of the frame 702. The front image data 715 of another frame similarly represents the input image 711 of the previous frame.

  The back image data 717 is processed image data output from the image processing unit 603 to the back panel 111. The image processing unit 603 generates back image data 717 by reducing the intensity of the spatial high-frequency component of the image data output from the one-frame delay unit 204. Therefore, the back image data 717 of each frame corresponds to the input image 711 of the previous frame. The width of the rectangle in the image represented by the back image data 717 is wider than the width of the rectangle in the input image 711.

  Here, it is assumed that the response speed of the front panel 112 and the back panel 111 is high and the response time of the front panel 112 and the back panel 111 is short enough to be ignored when the time change of the input gradation value is large. In the example of FIG. 6, only a large change, which is a time change between white and black, occurs as the time change of the tone value of the input image 711. Thus, the front image 716 is equivalent to the image represented by the front image data 715, and the back image 718 is equivalent to the image represented by the back image data 717.

  FIG. 8 is a schematic view showing an example of the correspondence between the motion determination result 712, the gradation change determination result 713, and the high frequency component reduction degree 714. As shown in FIG. As shown in FIG. 8, in the present embodiment, when the movement determination result 712 indicates “no movement”, the image processing unit 603 reduces high frequency components higher than when the movement determination result 712 indicates “movement”. The degree 714 is used. Specifically, when the movement determination result 712 indicates “no movement”, the image processing unit 603 uses “high level” as the high-frequency component reduction degree 714 regardless of the gradation change determination result 713. On the other hand, when the motion determination result 712 is “with motion” and the tone change determination result 713 is “tone change: small”, the image processing unit 603 performs “motion” and “tone change: The high frequency component reduction degree 714 which is lower than that of the large case is used. Specifically, the image processing unit 603 uses the “low level” as the high frequency component reduction degree 714 in the case of “with motion” and “tonal change: small”, and “in motion” and “tone change: large In the case of “1”, “medium level” is used as the high frequency component reduction degree 714.

  Here, an example of processing for an attention area indicated by a thick line will be described. In the example of FIG. 6, since the movement judgment result 712 of the attention area is "no movement" in the period of the frames 702, 703 and 707, "high level" is used as the high frequency component reduction degree 714 of the attention area. Then, in the period of frames 704 to 706, the movement judgment result 712 of the attention area is "with motion" and the gradation change judgment result 713 of the attention area is "gradation change: large". “Medium level” is used as the component reduction degree 714.

  As described above, “high level” is used as the high-frequency component reduction degree 714 for a divided area in which the movement determination result 712 is “no movement”. Therefore, a composite image 719 in which visual recognition of a double image is sufficiently suppressed in a divided area in which the movement determination result 712 is “no movement” is displayed. The middle level is used as the high-frequency component reduction degree 714 for a divided area in which the movement determination result 712 is “with movement” and the gradation change determination result 713 is “gradation change: large”. Therefore, a composite image in which the visual recognition of the double image is suppressed and the motion blur is reduced in the divided area in which the motion determination result 712 is “with motion” and the gradation change determination result 713 is “gradation change: large”. 719 is displayed. Here, when the gradation change determination result 713 is "gradation change: large", the motion blur due to the response speed of the front panel 112 or the back panel 111 is not large. Therefore, even if “medium level” is used as the high-frequency component reduction degree 714, a composite image 719 with sufficiently reduced motion blur is displayed.

<Second Operation of Display Device>
FIG. 7 is a schematic view showing an example of the operation of the display device 200. As shown in FIG. An input image 811 is shown in FIG.
The time change of the movement judgment result 812, the gradation change judgment result 813, the high frequency component reduction degree 814, the front image data 815, the front image 816, the back image data 817, the back image 818 and the composite image 819 is shown. . Here, it is assumed that each of the front panel 112 and the back panel 111 has the characteristic that the response speed changes depending on the time change of the input gradation value. Here, for the sake of simplicity, it is assumed that the predetermined image quality adjustment processing by the image quality adjustment unit 202 is omitted, and the input image data 210 is used as adjustment image data.

  In the example of FIG. 7, the input image 811 is an image in which light gray rectangles are arranged on a dark gray background. The rectangle stops at the center of the input image 811 in the period of frames 801 to 803, and the rectangle moves from the center of the input image 811 to the right in the period of frames 804 to 807.

  As described above, the motion determination unit 602 obtains, for each frame, a plurality of motion determination results 812 respectively corresponding to the plurality of divided areas. Here, a processing example for the attention area indicated by a thick line will be described. In the example of FIG. 7, the average luminance (the average luminance of the input image 811) of the attention area of the frame 802 is the same as the average luminance of the attention area of the frame 801. Therefore, “no motion (static)” is obtained as the motion determination result 812 for the attention area of the frame 802. Similarly, for each of the frames 803 and 807, “no motion” is obtained as the motion determination result 812 for the region of interest. On the other hand, the average luminance of the attention area of the frame 804 is different from the average luminance of the attention area of the frame 803, and the average luminance difference of the attention area between the frame 804 and the frame 803 (difference of the average luminance of the input image 811) is predetermined. Greater than the second threshold. Therefore, “motion (movement)” is obtained as the motion judgment result 812 for the attention area of the frame 804. Similarly, for each of the frames 805 and 806, “with motion” is obtained as the motion determination result 812 for the region of interest.

  As described above, the gradation change determination unit 601 obtains, for each frame, a plurality of gradation change determination results 813 respectively corresponding to the plurality of divided areas. Here, a processing example for the attention area indicated by a thick line will be described. In the example of FIG. 7, the average luminance (the average luminance of the input image 811) of the attention area of the frame 802 is the same as the average luminance of the attention area of the frame 801. Therefore, “gradation change: small” is obtained as the gradation change determination result 813 for the target area of the frame 802. Similarly, for each of the frames 803 and 807, “gradation change: small” is obtained as the gradation change determination result 813 for the region of interest. The average luminance of the attention area of the frame 804 is different from the average luminance of the attention area of the frame 803, but the average luminance difference of the attention area between the frame 804 and the frame 803 is less than or equal to a predetermined first threshold. Therefore, “gradation change: small” is also obtained as the gradation change determination result 813 for the target area of the frame 804. Similarly, for each of the frames 805 and 806, “gradation change: small” is obtained as the gradation change determination result 813 for the attention area.

  In the example of FIG. 7, the front image data 815 of each frame represents the input image 811 of the previous frame. The back image data 817 of each frame corresponds to the input image 811 of the previous frame. The width of the rectangle in the image represented by the back image data 817 is wider than the width of the rectangle in the input image 811.

Here, when the time change of the input gradation value is small, the response speed of the front panel 112 and the back panel 111 is low, and the response time of the front panel 112 and the back panel 111 is long enough to be ignored. In the example of FIG. 7, only a small change, which is a time change between dark gray and light gray, occurs as the time change of the gradation value of the input image 811. Therefore, the front image 816 is an image with a time delay with respect to the front image data 815, and the back image 818 is an image with a time delay with respect to the back image data 817. In other words, motion blur occurs in the front image 816 and the back image 818 due to the response speed of the front panel 112 and the back panel 111. Specifically, the width of the rectangle in the front image 816 is wider than the width of the rectangle in the image represented by the front image data 815, and the width of the rectangle in the back image 818 is in the image represented by the back image data 817. It is wider than the width of the rectangle.

  The image processing unit 603 obtains a plurality of high-frequency component reduction degrees 814 respectively corresponding to the plurality of divided areas for each frame according to the correspondence in FIG. 8. Here, an example of processing for an attention area indicated by a thick line will be described. In the example of FIG. 7, since the movement determination result 812 of the attention area is “no movement” in the period of the frames 802, 803, and 807, “high level” is used as the high frequency component reduction degree 814 of the attention area. Then, in the period of the frames 804 to 806, the movement judgment result 812 of the attention area is "with motion" and the gradation change judgment result 813 of the attention area is "gradation change: small". “Low level” is used as the component reduction degree 814.

  As described above, “high level” is used as the high-frequency component reduction degree 814 for a divided area in which the movement determination result 812 is “no movement”. Therefore, a composite image 819 in which visual recognition of a double image is sufficiently suppressed in a divided area in which the movement determination result 812 is “no movement” is displayed. Then, “low level” is used as the high-frequency component reduction degree 814 for a divided area in which the motion determination result 812 is “with motion” and the gradation change determination result 813 is “tone change: small”. Therefore, a composite image in which the visual recognition of the double image is suppressed and the motion blur is reduced in the divided area in which the motion determination result 812 is “with motion” and the gradation change determination result 813 is “gradation change: small”. 819 is displayed. Here, when the gradation change determination result 813 is “gradation change: small”, the moving image blur caused by the response speed of the front panel 112 or the back panel 111 is not small. Therefore, when “medium level” is used as the high frequency component reduction degree 814, moving image blur may not be sufficiently reduced. By using “low level” as the high-frequency component reduction degree 814, the motion blur is sufficiently reduced.

  As described above, according to the present embodiment, when the response speed determined to have motion and determined is low, the degree of reduction is lower than when the response speed determined to have motion and determined is high. Is used as the degree of reduction of the intensity of the spatial high frequency component. As a result, it is possible to further reduce moving image blur while suppressing visual recognition of a double image.

  Each functional unit of the first and second embodiments may or may not be individual hardware. The functions of two or more functional units may be realized by common hardware. Each of the plurality of functions of one functional unit may be realized by separate hardware. Two or more functions of one functional unit may be realized by common hardware. Also, each functional unit may or may not be realized by hardware. For example, the device may have a processor and a memory in which a control program is stored. The functions of at least some of the functional units of the device may be realized by the processor reading and executing the control program from the memory.

  The first and second embodiments are merely examples, and configurations obtained by appropriately changing or changing the configurations of the first and second embodiments within the scope of the present invention are also included in the present invention. The configuration obtained by appropriately combining the configurations of Embodiments 1 and 2 is also included in the present invention.

  For example, as the back panel 111, a self-luminous display panel such as an organic EL (Electro-Luminescence) panel may be used. In that case, the backlight unit 101 is unnecessary.

  Although a total of 12 processing areas (division areas) of 4 horizontal directions × 3 vertical directions have been described, the number, size, arrangement, shape, and the like of the processing areas are not particularly limited. For example, the plurality of processing regions may be arranged in a staggered manner. A total of 144 processing regions of 16 horizontal directions × 9 vertical directions may be used. An area of one pixel may be used as one processing area. The presence or absence of motion may be determined for the entire image area (one area) of the input image data 210, and the response speed may be determined individually for each processing area. The presence or absence of movement may be determined individually for each processing area, and the response speed may be determined for the entire image area (one area) of the input image data 210.

  Although an example using two response speeds ("tone change: large" and "tone change: small") has been described, the number of steps of the response speed may be three or more. Then, three or more reduction degrees may be used as the reduction degree (the reduction degree of the strength of the spatial high-frequency component) when it is determined that there is movement. For example, a high response speed, “tone change: large”, a medium response speed, “tone change: medium”, and a low response speed, “tone change: small” may be used. Then, in the case of "with motion" and "gradation change: small", a reduction degree lower than that in the case of "with motion" and "gradation change: medium" is used, and "motion" and "gradation change: A lower degree of reduction may be used in the "medium" case than in the "with motion" and "tone change: large" cases.

  Although the example which reduces only the intensity | strength of the high frequency component in a horizontal direction was demonstrated, it is not restricted to this. For example, only the intensity of the high frequency component in the vertical direction may be reduced, or both the intensity of the high frequency component in the horizontal direction and the intensity of the high frequency component in the vertical direction may be reduced. However, since a change in the horizontal direction is likely to occur as a change in the user's line of sight direction, a reduction degree lower than the reduction degree of the high frequency component in the vertical direction is used as the reduction degree of the high frequency component in the horizontal direction. Is preferred.

  Although the example which judges the presence or absence of the motion between the said 2 flames | frames was demonstrated from the brightness | luminance data of continuous 2 frames, it is not restricted to this. For example, the presence or absence of a motion may be determined by motion vector detection. When motion identification information (information identifying motion or non-motion; information identifying motion or still image) is added as metadata to the input image data 210, motion identification information is used to identify motion. The presence or absence may be determined. Here, it is assumed that a photographing device capable of photographing a moving image and a still image outputs photographed image data to a display device. When the imaging device is shooting a moving image, the shooting device outputs the image data obtained by the shooting to the display device by adding identification information indicating the moving image. Then, using the identification information of the image data output from the imaging device, the display device determines that the image data is a moving image, and determines that “motion is present”. Similarly, when the photographing device is photographing a still image, the photographing device outputs the image data obtained by the photographing to the display device with identification information indicating the still image. Then, the display device determines that the image data is a still image by using the identification information of the image data output from the imaging device, and determines that there is no movement.

  Although the example in which the display panel has the characteristic that the response speed is low when the time change of the input gradation value is small is smaller than the case where the time change is large, the present invention is not limited thereto. For example, the display panel may have a characteristic that the response speed is low when the time change of the input gradation value is large as compared with the case where the time change is small. Even if the magnitude of the time change from the low tone value to the other low tone value and the magnitude of the time change from the high tone value to the other high tone value are the same, the response corresponding to each time change The speeds may be different from one another.

<Other Embodiments>
The present invention supplies a program that implements one or more functions of the above-described embodiments to a system or apparatus via a network or storage medium, and one or more processors in a computer of the system or apparatus read and execute the program. Can also be realized. Also,
It can also be implemented by a circuit (eg, an ASIC) that implements one or more functions.

100, 200: Display device 111: Back panel 112: Front panel 205, 602: Motion judgment unit 206, 603: Image processing unit

Claims (19)

First determining means for determining presence or absence of movement of an image in input image data;
Processing means for generating processed image data by reduction processing for reducing the intensity of the spatial high-frequency component of the input image data with a reduction degree based on the determination result of the first determination means;
A first panel for displaying a first image by outputting light based on the processed image data;
A second panel that displays a second image by transmitting light output from the first panel based on the input image data;
Have
A display characterized in that the processing means uses, when the first judgment means judges that there is the movement, a reduction degree lower than when the first judgment means judges that there is no movement. apparatus. It further has a light emitting part,
The display device according to claim 1, wherein the first panel displays the first image by transmitting light emitted from the light emitting unit based on the processed image data. The display device according to claim 1, wherein the first panel is a self-luminous display panel. The reduction processing is processing for converting, for each pixel of the input image data, the gradation value of a target pixel into an average gradation value of a reference area including the target pixel,
The processing means is characterized in that, when it is judged by the first judgment means that there is the movement, a reference area smaller than that when the first judgment means judges that there is no movement is used. The display device according to any one of Items 1 to 3. The reduction process is a low pass filter process,
The processing means is, when the first judgment means judges that there is the movement, a cutoff frequency of the low-pass filter processing that is higher than when the first judgment means judges that the movement does not exist The display device according to any one of claims 1 to 4, wherein the display device is used as a frequency. The image processing apparatus further comprises second determination means for determining the response speed of at least one of the first panel and the second panel, corresponding to the time change of the gradation value of the input image data.
The processing means is determined by the first determination means that the movement is present when the first determination means determines that the movement is present and the response speed determined by the second determination means is low. The display device according to any one of claims 1 to 5, wherein a reduction degree lower than that in the case where the response speed determined by the second determination means is high is used. At least one of the first panel and the second panel has a characteristic that the response speed is low when the time change of the input gradation value is small as compared with the case where the time change is large,
The processing means is determined by the first determination means that the movement is determined to be present when the first determination means determines that the movement is present and the time change of the gradation value of the input image data is small. The display device according to any one of claims 1 to 5, wherein a reduction degree lower than that in the case where the time change of the gradation value of the input image data is large is used. The display device according to any one of claims 1 to 7, wherein the processing means determines the reduction degree individually for each of a plurality of image areas in the input image data. The processing means uses, as the reduction degree of the strength of the high frequency component in the horizontal direction, a reduction degree lower than the reduction degree of the strength of the high frequency component in the vertical direction. Display device as described. A backlight module that emits light to the front side,
A first panel provided on the front side of the backlight module and transmitting light emitted from the backlight module;
A second panel provided on the front side of the first panel to further transmit light transmitted through the first panel to display an image on a screen;
The light transmittance of the first panel is controlled using first control image data based on image data, and the light transmittance of the second panel is controlled using second control image data based on the image data Control means,
The image data is subjected to image processing including predetermined processing for reducing the intensity of the spatial high frequency component, and generation means for generating the second control image data.
The generation unit executes the predetermined processing under a first processing condition when the image data is moving image data, and the first processing condition is different from the first processing condition when the image data is still image data. (2) A display device characterized in that the predetermined processing is executed under processing conditions. The intensity of the spatial high frequency component of the image data subjected to the predetermined processing under the first processing condition is the spatial high frequency component of the image data subjected to the predetermined processing under the second processing condition 11. The display device according to claim 10, wherein the display device has a higher strength than. The predetermined process is a process of converting, for each pixel of the image data, the tone value of a target pixel into an average tone value of a reference area including the target pixel,
12. The display device according to claim 10, wherein a size of the reference area under the first processing condition is smaller than a size of the reference area under the second processing condition. The predetermined process is a low pass filter process,
12. The display device according to claim 10, wherein a cutoff frequency of the low pass filter processing under the first processing condition is higher than a cutoff frequency of the low pass filtering processing under the second processing condition. . The generation means is characterized in that the predetermined processing is not performed when the image data is moving image data, and the predetermined processing is performed when the image data is still image data. The display device according to claim 10. The display device according to any one of claims 10 to 13, wherein the first control image data is the image data subjected to image processing not including the predetermined processing. A first panel for displaying a first image by outputting light based on processed image data generated from input image data;
A second panel that displays a second image by transmitting light output from the first panel based on the input image data;
A control method of a display device having
A determination step of determining presence or absence of movement of an image in the input image data;
A processing step of generating the processed image data by a reduction process of reducing the intensity of the spatial high frequency component of the input image data according to the reduction degree based on the judgment result of the judgment step;
Have
In the processing step, when it is determined in the determination step that the movement is present, a control method characterized by using a lower reduction degree than in the case where it is determined in the determination step that the movement is not present. A backlight module that emits light to the front side,
A first panel provided on the front side of the backlight module and transmitting light emitted from the backlight module;
A second panel provided on the front side of the first panel to further transmit light transmitted through the first panel to display an image on a screen;
A control method of a display device having
The light transmittance of the first panel is controlled using first control image data based on image data, and the light transmittance of the second panel is controlled using second control image data based on the image data Control step,
The image data is subjected to image processing including predetermined processing for reducing the intensity of the spatial high-frequency component to generate the second control image data;
In the generation step, when the image data is moving image data, the predetermined processing is executed under a first processing condition, and when the image data is still image data, a first processing condition different from the first processing condition is generated. (2) A control method characterized in that the predetermined process is executed under process conditions.   A program for causing a computer to execute each step of the control method according to claim 16 or 17.   A computer readable storage medium storing a program for causing a computer to execute each step of the control method according to claim 16 or 17.

Images