WO2016063675A1 - Image processing device and image processing method - Google Patents

Abstract

This image processing device comprises: a first processing unit for generating a first image map used for display on a first liquid crystal display unit on the basis of an input image map; and a second processing unit having a filter unit for generating a first map by carrying out a filtering process to blur an image on the basis of the input image map, and generating, on the basis of the first map, a second image map used for display on a second liquid crystal display unit disposed between the first liquid crystal display unit and a backlight.

Description

Image processing apparatus and image processing method

The present disclosure relates to an image processing apparatus that processes an image and an image processing method used in such an image processing apparatus.

In recent years, replacement of CRT (Cathode Ray Tube) display devices with liquid crystal display devices (LCD) has been progressing. Liquid crystal display devices are becoming mainstream of display devices because they can reduce power consumption and can form thin display devices compared to CRT display devices.

In the display device, various techniques for improving the image quality are disclosed. For example, Patent Document 1 discloses a display device in which two liquid crystal display panels are arranged to overlap each other and perform video display. In this display device, by using two liquid crystal display panels, the contrast ratio is improved by reducing so-called black luminance as compared with the case of using one liquid crystal display panel.

International Publication No. 2007/040127

Thus, in general, display devices are desired to have high image quality, and image processing devices used in display devices are expected to further improve image quality.

Therefore, it is desirable to provide an image processing apparatus and an image processing method that can improve image quality.

The first image processing apparatus according to an embodiment of the present disclosure includes a first processing unit and a second processing unit. The first processing unit generates a first image map used for display on the first liquid crystal display unit based on the input image map. The second processing unit includes a filter unit that performs a filtering process to blur the image based on the input image map and generates a first map. The first liquid crystal display unit and the backlight are based on the first map. A second image map used for display on the second liquid crystal display unit disposed between the two is generated.

The second image processing apparatus according to an embodiment of the present disclosure includes a first processing unit and a second processing unit. The first processing unit generates a first image map used for display on the first liquid crystal display unit based on the input image map. The second processing unit generates a luminance map including the luminance value in each pixel based on the input image map, and generates a second map by performing gamma conversion on each luminance value of the luminance map. A conversion unit that generates a second image map used for display in the second liquid crystal display unit disposed between the first liquid crystal display unit and the backlight, based on the second map; is there.

A first image processing method according to an embodiment of the present disclosure generates a first image map used for display in a first liquid crystal display unit based on an input image map, and generates an image based on the input image map. A first map is generated by performing a blurring filter process, and a second map used for display in the second liquid crystal display unit disposed between the first liquid crystal display unit and the backlight is generated based on the first map. An image map is generated.

The second image processing method according to the embodiment of the present disclosure generates a first image map used for display in the first liquid crystal display unit based on the input image map, and generates each first image map based on the input image map. A luminance map including luminance values in the pixels is generated, a second map is generated by performing gamma conversion on each luminance value of the luminance map, and the first liquid crystal display unit is generated based on the second map And a second image map used for display in the second liquid crystal display unit disposed between the backlight and the backlight.

In the first image processing device and the first image processing method according to the embodiment of the present disclosure, a first image map used for display on the first liquid crystal display unit is generated based on the input image map. A second image map used for display on the second liquid crystal display unit is generated. At that time, a first map is generated by performing filter processing based on the input image map, and a second image map is generated based on the first map.

In the second image processing device and the second image processing method according to the embodiment of the present disclosure, a first image map used for display on the first liquid crystal display unit is generated based on the input image map. A second image map used for display on the second liquid crystal display unit is generated. At this time, a luminance map is generated based on the input image map, and a second map is generated by performing gamma conversion on each luminance value of the luminance map, and a second map is generated based on the second map. An image map is generated.

According to the first image processing device and the first image processing method of the embodiment of the present disclosure, the first map is generated by performing the filter processing for blurring the image based on the input image map. Since the second image map is generated based on this map, the image quality can be improved.

According to the second image processing device and the second image processing method in an embodiment of the present disclosure, a luminance map is generated based on an input image map, and gamma conversion is performed on each luminance value of the luminance map. By doing so, the second map is generated, and the second image map is generated based on the second map, so that the image quality can be improved.

Note that the effects described here are not necessarily limited, and any of the effects described in the present disclosure may be provided.

3 is a block diagram illustrating a configuration example of a display device according to a first embodiment of the present disclosure. FIG. FIG. 2 is a block diagram illustrating a configuration example of a liquid crystal display panel (front panel) illustrated in FIG. 1. FIG. 2 is a block diagram illustrating a configuration example of a liquid crystal display panel (rear panel) illustrated in FIG. 1. FIG. 2 is a block diagram illustrating a configuration example of a backlight illustrated in FIG. 1. It is explanatory drawing showing the principal part cross-section of the display apparatus shown in FIG. FIG. 2 is a block diagram illustrating a configuration example of a signal generation unit illustrated in FIG. 1. FIG. 7 is a characteristic diagram illustrating a characteristic example of a gamma conversion unit illustrated in FIG. 6. It is explanatory drawing for demonstrating the characteristic shown in FIG. FIG. 7 is an explanatory diagram illustrating an operation example of the filter unit illustrated in FIG. 6. It is explanatory drawing for demonstrating a block. FIG. 7 is an explanatory diagram illustrating an operation example of the signal generation unit illustrated in FIG. 6. FIG. 2 is a block diagram illustrating a configuration example of a correction unit illustrated in FIG. 1. FIG. 3 is a characteristic diagram illustrating a characteristic example of the liquid crystal display panel (rear panel) illustrated in FIG. 1. 13 is a table illustrating a configuration example of a lookup table in the color signal generation unit illustrated in FIG. 12. FIG. 7 is an explanatory diagram illustrating an operation example of the display device illustrated in FIG. 1. It is explanatory drawing showing the operation example of the display apparatus which concerns on a comparative example. FIG. 17 is an explanatory diagram illustrating a characteristic example of the display device illustrated in FIG. 16. It is a block diagram showing the example of 1 structure of the signal generation part which concerns on a modification. It is a block diagram showing the example of 1 structure of the display apparatus which concerns on 2nd Embodiment. FIG. 20 is a block diagram illustrating a configuration example of a correction unit illustrated in FIG. 19. FIG. 20 is an explanatory diagram illustrating an operation example of the display device illustrated in FIG. 19.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The description will be given in the following order.
1. First Embodiment 2. FIG. Second embodiment

<1. First Embodiment>
[Configuration example]
(Overall configuration example)
FIG. 1 illustrates a configuration example of a display device (display device 1) to which the image processing device according to the first embodiment is applied. The display device 1 includes two liquid crystal display panels. Note that the image processing method according to the embodiment of the present disclosure is embodied by the present embodiment, and will be described together.

The display device 1 includes an image processing unit 10, liquid crystal display panels 20 and 30, and a backlight 40. As shown in FIG. 1, the display device 1 is obtained by superposing a liquid crystal display panel 20 (front panel) and a liquid crystal display panel 30 (rear panel).

The image processing unit 10 generates an image signal S20, a signal S30, and a backlight control signal S40 based on the image signal Spic. The image signal Spic is a so-called RGB signal including a signal IR indicating red (R) luminance information, a signal IG indicating green (G) luminance information, and a signal IB indicating blue (B) luminance information. In this example, the signal is a UHD (Ultra High Definition) format signal. The image processing unit 10 supplies an image signal S20 to the liquid crystal display panel 20, supplies a signal S30 to the liquid crystal display panel 30, and supplies a backlight control signal S40 to the backlight 40.

The liquid crystal display panel 20 displays a color image based on the image signal S20. In this example, the liquid crystal display panel 20 is a display panel capable of displaying a so-called 4K2K (3840 pixels × 2160 pixels) UHD image. The liquid crystal display panel 20 is disposed on the surface side of the liquid crystal display panel 30 (rear panel) via a diffusion plate 9 (described later).

FIG. 2 shows a configuration example of the liquid crystal display panel 20. The liquid crystal display panel 20 includes a display control unit 21, a vertical drive unit 22, a horizontal drive unit 23, and a display unit 24.

The display control unit 21 supplies a control signal to the vertical drive unit 22 based on the image signal S20 and also supplies an image signal and a control signal to the horizontal drive unit 23, which are synchronized with each other. It controls to operate. Based on the control signal supplied from the display control unit 21, the vertical drive unit 22 sequentially selects one horizontal line as a display drive target in the display unit 24. The horizontal drive unit 23 generates a pixel voltage Vsig for one horizontal line based on the image signal and the control signal supplied from the display control unit 21, and the sub-pixel 26 for one horizontal line selected by the vertical drive unit 22. (To be described later).

The display unit 24 has a plurality of pixels 25 arranged in a matrix. Each pixel 25 has three sub-pixels 26R, 26G, and 26B. The sub-pixel 26R has a red color filter (not shown), the sub-pixel 26G has a green color filter (not shown), and the sub-pixel 26B has a blue color filter (not shown). (Not shown). The sub-pixels 26R, 26G, and 26B are supplied with the pixel voltage Vsig from the horizontal driving unit 23, respectively. The sub-pixels 26R, 26G, and 26B each change the light transmittance according to the pixel voltage Vsig.

The liquid crystal display panel 30 displays a monochrome image based on the signal S30. In this example, the liquid crystal display panel 30 is a display panel capable of displaying a so-called 2K1K (1920 pixels × 1080 pixels) FHD (Full High Definition) image. That is, the display resolution of the liquid crystal display panel 30 is lower than the display resolution of the liquid crystal display panel 20. The liquid crystal display panel 30 is disposed on the back side of the liquid crystal display panel 20 via a diffusion plate 9 (described later).

FIG. 3 shows a configuration example of the liquid crystal display panel 30. The liquid crystal display panel 30 includes a display control unit 31, a vertical drive unit 32, a horizontal drive unit 33, and a display unit 34.

Similarly to the display control unit 21, the display control unit 31 supplies a control signal to the vertical drive unit 32 and also supplies an image signal and a control signal to the horizontal drive unit 33 based on the signal S30. These are controlled so as to operate in synchronization with each other. Similar to the vertical drive unit 22, the vertical drive unit 32 sequentially selects one horizontal line to be a display drive target in the display unit 34 based on a control signal supplied from the display control unit 31. Similar to the horizontal drive unit 23, the horizontal drive unit 33 generates a pixel voltage Vsig for one horizontal line based on the image signal and the control signal supplied from the display control unit 31, and the vertical drive unit 32 selects the pixel voltage Vsig. This is supplied to sub-pixels 36 (described later) for one horizontal line.

The display unit 34 has a plurality of pixels 35 arranged in a matrix. Each pixel 35 has three sub-pixels 36. Each sub-pixel 36 does not have a color filter. That is, each sub pixel 26R, 26G, 26B in the liquid crystal display panel 20 (front panel) has a color filter of a corresponding color, but each sub pixel 36 in the liquid crystal display panel 30 (rear panel) has a color filter. Not to have. The same pixel voltage Vsig is supplied from the horizontal drive unit 33 to the three sub-pixels 36 belonging to one pixel 35. The sub-pixel 36 changes the light transmittance according to the pixel voltage Vsig.

The liquid crystal display panel 30 including such a display unit 34 can be manufactured by omitting a color filter forming step in a manufacturing process of a general-purpose liquid crystal display panel capable of displaying a color image. Thereby, in display device 1, development cost and manufacturing cost can be reduced compared with the case where exclusive goods are developed.

The backlight 40 emits light based on the backlight control signal S40. The backlight 40 is disposed on the back side of the liquid crystal display panel 30.

FIG. 4 shows a configuration example of the backlight 40. The backlight 40 includes a drive unit 41 and a light emitting array 42. The drive unit 41 drives the light emitting array 42 based on the backlight control signal S40. The light emitting array 42 has a plurality (168 in this example) of light emitting units 43. Each light emitting unit 43 includes, for example, an LED (Light （Emitting Diode), and is configured such that the light emission luminance can be individually set based on drive control by the drive unit 41. Specifically, the driving unit 41 can individually set the light emission luminance by driving each light emitting unit 43 by pulse width modulation, for example.

FIG. 5 shows a main configuration of the display device 1. In the display device 1, the backlight 40, the liquid crystal display panel 30, and the liquid crystal display panel 20 are arranged in this order, and the upper surface of the liquid crystal display panel 20 is the display surface A. That is, the light emitted from the backlight 40 passes through the liquid crystal display panel 30 and the liquid crystal display panel 20 in order, and reaches the observer. The liquid crystal display panel 20 and the liquid crystal display panel 30 are spaced apart from each other. A diffusion plate 9 is disposed in the gap 8 between the liquid crystal display panels 20 and 30.

The liquid crystal display panel 20 includes substrates 122 and 124, a liquid crystal layer 123, and polarizing plates 121 and 125. The substrates 122 and 124 are made of, for example, a glass substrate, and are disposed so as to face each other. A pixel electrode (not shown) is formed for each sub-pixel 26 on the surface of the substrate 122 on the substrate 124 side, and a pixel voltage Vsig is applied by the horizontal driving unit 23. An electrode (not shown) common to the sub-pixels 26 is formed on the surface of the substrate 124 on the substrate 122 side. In addition, a color filter (not shown) and a black matrix (not shown) are formed on the substrate 124. The liquid crystal layer 123 is sealed between the substrate 122 and the substrate 124, and the light transmittance changes according to the pixel voltage Vsig applied to the pixel electrode of the substrate 122. The polarizing plate 121 is attached to the light incident side of the substrate 122, and the polarizing plate 125 is attached to the light emitting side of the substrate 124. The transmission axis of the polarizing plate 121 and the transmission axis of the polarizing plate 125 intersect each other.

The liquid crystal display panel 30 includes substrates 132 and 134, a liquid crystal layer 133, and polarizing plates 131 and 135. The substrates 132 and 134 are made of, for example, a glass substrate and are disposed so as to face each other. A pixel electrode (not shown) is formed for each sub-pixel 26 on the surface of the substrate 132 on the substrate 134 side, and a pixel voltage Vsig is applied by the horizontal drive unit 33. An electrode (not shown) common to the sub-pixels 36 is formed on the surface of the substrate 134 on the substrate 132 side. Further, a black matrix (not shown) is formed on the substrate 134. That is, unlike the substrate 124 of the liquid crystal display panel 20, no color filter is formed on the substrate 134. The liquid crystal layer 133 is sealed between the substrate 132 and the substrate 134, and the light transmittance changes according to the pixel voltage Vsig applied to the pixel electrode of the substrate 132. The polarizing plate 131 is attached to the light incident side of the substrate 132, and the polarizing plate 135 is attached to the light emitting side of the substrate 134. The transmission axis of the polarizing plate 131 and the transmission axis of the polarizing plate 135 intersect each other.

The diffusion plate 9 diffuses light incident from the liquid crystal display panel 30 side. As the diffusion plate 9, for example, a diffusion film in which beads are randomly distributed on the resin film or in the resin film can be used. The diffusion plate 9 is for reducing moire in the display image. In other words, since the display device 1 has the two liquid crystal display panels 20 and 30 arranged so as to overlap each other, there is a possibility that moire occurs in the display image. In the display device 1, the diffusing plate 9 is disposed between the liquid crystal display panels 20 and 30, so that moire can be reduced and deterioration in image quality can be suppressed.

As shown in FIG. 5, the diffusion plate 9 may be disposed at any position in the gap 8, but is desirably disposed on the side close to the liquid crystal display panel 20 (front panel). That is, of the inter-panel distance d, the distance d1 between the diffusion plate 9 and the liquid crystal display panel 20 is preferably smaller than the distance d2 between the diffusion plate 9 and the liquid crystal display panel 30 (d1 <d2). . In this case, a transparent material layer may be formed between one or both of the diffusion plate 9 and the liquid crystal display panel 20 and between the diffusion plate 9 and the liquid crystal display panel 30. Further, it is more desirable to dispose the diffusion plate 9 adjacent to the liquid crystal display panel 20 (d1 = 0). This is because the closer the diffusing plate 9 is to the liquid crystal display panel 20, the more effectively the moire can be suppressed and the sharpness can be increased.

As the diffusion degree (haze value) of the diffusion plate 9 is higher, moire can be effectively suppressed. For example, if the haze value is 90% or more, the degree of freedom in designing the inter-panel distance d for obtaining a desired image quality can be increased. However, if the haze value becomes high, there is a concern that the luminance is lowered. Therefore, as described above, it is desirable to reduce the resolution of the liquid crystal display panel 30 (rear panel) and delete the color filter. Even when the haze value of the diffusion plate 9 is low, for example, the desired image quality can be obtained by placing the diffusion plate 9 close to the liquid crystal display panel 20 (front panel).

The backlight 40 has a diffusion plate 141 in addition to the light emitting array 42. The diffusion plate 141 diffuses the light emitted from the light emitting array 42.

(Image processing unit 10)
The image processing unit 10 (FIG. 1) includes a signal generation unit 50, a backlight control unit 60, and a correction unit 70.

The signal generator 50 generates a signal S30 to be supplied to the liquid crystal display panel 30 (rear panel) based on the image signal Spic.

FIG. 6 shows a configuration example of the signal generation unit 50. The signal generation unit 50 includes a size conversion unit 51, a luminance map generation unit 52, a filter unit 53, a gamma conversion unit 54, a filter unit 55, maximum value acquisition units 56A and 56B, a gain calculation unit 57, A gain map generator 58 and a multiplier 59 are included.

The size converter 51 converts the image size by converting the format of the image signal Spic from the UHD format to the FHD format. That is, in the signal generation unit 50, in order to generate the signal S30 to be supplied to the liquid crystal display panel 30, the size conversion unit 51 first converts the format of the image signal Spic into the display resolution (FHD) of the liquid crystal display panel 30. Convert to a format corresponding to. The size conversion unit 51 supplies the conversion result to the luminance map generation unit 52.

The luminance map generator 52 calculates the luminance value Y based on the signals IR, IG, and IB included in the image signal supplied from the size converter 51. Specifically, the luminance map generation unit 52 calculates the luminance value Y using the following equation.

The luminance map generation unit 52 generates a luminance map M52 including the luminance value Y for one screen and supplies the luminance map M52 to the filter unit 53.

The filter unit 53 performs a filtering process on the luminance map M52 using an FIR (Finite impulse response) filter. This FIR filter functions as a low-pass filter. Accordingly, the filter unit 53 removes noise included in the luminance map M52 and generates a luminance map M53. The filter unit 53 supplies the luminance map M53 to the gamma conversion unit 54.

The gamma conversion unit 54 performs gamma conversion on each luminance value Y of the luminance map M53.

FIG. 7 shows the conversion characteristics in the gamma conversion unit 54. In this example, the input value (luminance value Y) is a value between 0 and 256, and the output value is a value between 0 and 1. In this conversion characteristic, when the input value is “0”, the output value is “0”, and when the input value is greater than the predetermined value In1, the output value is “1”. When the input value is larger than 0 and smaller than the predetermined value In1, the output value increases monotonously according to the input value. Thus, the gamma value in the gamma converter 54 is smaller than 1, and is preferably 0.3 or less. In FIG. 7, the conversion characteristic in the range where the input value is larger than 0 and smaller than the predetermined value In1 is determined by the transmittance in the low gradation range of the liquid crystal display panel 20 (front panel) as described below. Is desirable.

FIG. 8 shows the light transmittance in the liquid crystal display panels 20 and 30. In FIG. 8, the horizontal axis indicates the gradation level of the signal supplied to the liquid crystal display panels 20 and 30, and the vertical axis indicates the transmittances L20 and L30. Here, the transmittance L20 indicates the transmittance in the liquid crystal display panel 20, and the transmittance L30 indicates the transmittance in the liquid crystal display panel 30. In the liquid crystal display panel 20 (front panel), in the range where the gradation level is higher than about 40 [%], the transmittance L20 changes according to the gradation level. However, in the range where the gradation level is lower than about 40 [%], the transmittance L20 becomes almost constant. That is, in the liquid crystal display panel 20, the transmittance L20 is not sufficiently lowered in the low gradation range. Therefore, in the display device 1, the transmittance L30 in the liquid crystal display panel 30 (rear panel) is constant (100%) in a range where the gradation level is higher than about 40 [%], and the gradation level is about 40 [%]. In the low range, the transmittance L30 in the liquid crystal display panel 30 (rear panel) is changed according to the gradation level. As a result, in the display device 1, even when the product Ltotal of the transmittance L20 in the liquid crystal display panel 20 and the transmittance L30 in the liquid crystal display panel 30 is in a range where the gradation level is lower than about 40 [%], Similar to the range higher than about 40 [%], it can be changed according to the gradation level. Thereby, in the display device 1, for example, the transmittance Ltotal can be lowered in the low gradation range as compared with the case where the display device is configured using one liquid crystal display panel 20, so that the contrast can be increased. It can be done.

The gamma conversion unit 54 performs gamma conversion so as to realize the transmittance L30 shown in FIG. The gamma conversion unit 54 generates a map M54 by performing such gamma conversion on the luminance value Y at each coordinate of the luminance map M53. Then, the gamma conversion unit 54 supplies the map M54 to the filter unit 55 and the maximum value acquisition unit 56A.

The filter unit 55 performs filter processing on the map M54 using an FIR filter. This FIR filter functions as a low-pass filter and blurs an image displayed on the liquid crystal display panel 30 (rear panel). Thereby, in the display device 1, when an observer observes the display image of the display device 1, the possibility that a double image is generated in the display image can be reduced as will be described later. The FIR filter can be configured with, for example, 11 taps. As will be described below, the number of taps is set according to the target value θ of the viewing angle that does not generate a double image in the display image.

9A and 9B show filter processing in the filter unit 55, where FIG. 9A shows a schematic cross-sectional view of the liquid crystal display panels 20 and 30, and FIG. 9B shows luminance in the liquid crystal display panels 20 and 30. FIG. In this example, the liquid crystal display panel 20 (front panel) displays the display element a11, and the liquid crystal display panel 30 (rear panel) is displayed at a position corresponding to the display position of the display element a11 on the liquid crystal display panel 20. Is displayed. Since the display element a12 is blurred by the filter unit 55, the width b12 of the display element a12 is larger than the width b11 of the display element a12. The width b (corresponding to half the difference between the width b12 and the width b11) widened by the filter unit 55 can be expressed by the following equation.

In other words, the number of taps Ntap of the FIR filter in the filter unit 55 can be expressed by the following expression.

Here, Dp is the number of pixels (pixel density) per unit length in the liquid crystal display panel 30 (rear panel). Further, the tap number Ntap may be adjusted according to the degree of diffusion in the diffusion plate 9. Specifically, for example, when the degree of diffusion in the diffusion plate 9 is high, the number of taps Ntap can be reduced.

In this way, the filter unit 55 performs the filter process on the map M54 to generate the map M55. The filter unit 55 supplies the map M55 to the multiplication unit 59 and the maximum value acquisition unit 56B.

The maximum value acquisition unit 56A calculates a maximum value MAXA of signal values in each block BL (described later) based on the map M54. The maximum value acquisition unit 56B obtains the maximum value MAXB of signal values in each block BL based on the map M55.

FIG. 10 shows the arrangement of the pixels 35 in the display unit 34 of the liquid crystal display panel 30 (rear panel). The display unit 34 is divided into a plurality of blocks BL. The size of each block BL corresponds to 121 (11 × 11) pixels 35 in this example. This size is determined according to the number of taps of the FIR filter in the filter unit 55. Specifically, it is desirable that the size of the block BL is greater than or equal to the number of taps of the FIR filter. Thereby, when the filter process is performed in the filter unit 55, it is possible to prevent the coordinates at which the maximum signal value is generated from being shifted.

The maximum value acquisition unit 56A obtains the maximum value MAXA out of 121 signal values in this example in each block BL based on the map M54. Then, the maximum value acquisition unit 56A supplies the maximum value MAXA to the gain calculation unit 57. Similarly, the maximum value acquisition unit 56B obtains the maximum value MAXB out of 121 signal values in this example in each block BL based on the map M55. Then, the maximum value acquisition unit 56B supplies the maximum value MAXB to the gain calculation unit 57.

The gain calculation unit 57 calculates the gain G in each block BL based on the maximum values MAXA and MAXB supplied from the maximum value acquisition units 56A and 56B. Specifically, in this example, the gain G is calculated by the following equation.

Then, the gain calculation unit 57 supplies the gain G of each block BL to the gain map generation unit 58.

The gain map generation unit 58 performs linear interpolation processing based on the gain G of each block BL supplied from the gain calculation unit 57, thereby gain corresponding to the display resolution (FHD) of the liquid crystal display panel 30 (rear panel). The map M58 is generated. That is, since the gain G is a value for each block BL, the gain map generator 58 generates a gain map M58 corresponding to the display resolution (FHD) of the liquid crystal display panel 30 by performing linear interpolation processing. Then, the gain map generator 58 supplies the gain map M58 to the multiplier 59.

The multiplication unit 59 generates a map M30 by multiplying signal values at the same coordinates in the map M55 and the gain map M58, respectively. The multiplication unit 59 outputs the map M30 using the signal S30.

FIG. 11 shows operations of the maximum value acquisition units 56A and 56B, the gain calculation unit 57, the gain map generation unit 58, and the multiplication unit 59. FIG. 11A shows signal values in the map M54, and FIG. The signal value in the map M55 is shown, and (C) shows the signal value in the map M30. This figure shows signal values in one block BL, and the gain G is constant within the drawn range.

The filter unit 55 generates a map M55 (FIG. 11B) by performing filter processing on the map M54 (FIG. 11A). At this time, as shown in FIG. 11B, the maximum value MAXB may be lower than the maximum value MAXA. The gain calculation unit 57 obtains the gain G based on the maximum values MAXA and MAXB, and the multiplication unit 59 multiplies the signal value of the map M55 (FIG. 11B) by the gain G to thereby obtain the signal value of the map M30. (FIG. 11C) is generated. In this way, in the display device 1, for each block BL, the maximum value of the signal value in the map M30 after the filtering process is matched with the maximum value MAXA of the signal value of the map M54 before the filtering process.

Thereby, in the display device 1, it is possible to reduce a possibility that the luminance is lowered by the filter processing in the filter unit 55. That is, for example, when the maximum value acquisition units 56A and 56B, the gain calculation unit 57, the gain map generation unit 58, and the multiplication unit 59 are not provided and the map M55 generated by the filter unit 55 is output as it is, FIG. As shown in B), the signal value may be lowered by the filtering process in the filter unit 55, and the luminance may be lowered. On the other hand, in the display device 1, as described above, for each block BL, the maximum value of the signal value in the map M30 after the filter process is matched with the maximum value MAXA of the signal value of the map M54 before the filter process. Thus, the possibility that the luminance is lowered is reduced.

The backlight control unit 60 (FIG. 1) generates a backlight control signal S40 based on the image signal Spic. The backlight control signal S40 instructs the light emission luminance of each light emitting unit 43 of the backlight 40.

The correction unit 70 (FIG. 1) generates an image signal S20 to be supplied to the liquid crystal display panel 20 by correcting the image signal Spic based on the image signal Spic, the signal S30, and the backlight control signal S40. is there.

FIG. 12 shows a configuration example of the correction unit 70. The correction unit 70 includes a color signal generation unit 71, a backlight map generation unit 72, a multiplication unit 73, a filter unit 74, a size conversion unit 75, and a division unit 76.

The color signal generation unit 71 generates an RGB signal for correcting chromaticity characteristics in the liquid crystal display panel 30 (rear panel) based on the signal S30 (map M30).

FIG. 13 shows chromaticity characteristics in the liquid crystal display panel 30. In FIG. 13, the horizontal axis indicates the gradation level, and the vertical axis indicates the x value (x coordinate) and the y value (y coordinate) in the xy chromaticity diagram. Since the liquid crystal display panel 30 displays a monochrome image, it is desirable that the x value and the y value be constant regardless of the gradation level. However, as shown in FIG. 13, the x value and the y value may change depending on the gradation level. Therefore, in the display device 1, the color signal generation unit 71 generates an RGB signal for correcting the chromaticity in the liquid crystal display panel 30 based on each signal value of the map M30. As will be described later, the correction unit 70 corrects the image signal Spic based on the RGB signals.

The color signal generation unit 71 has a lookup table LUT as shown in FIG. 14, for example. By using this lookup table LUT, the signal value (input value) of the map M30 is converted into an RGB signal (signal IR2, signal IR2,). IG2, IB2).

The lookup table LUT is created as follows, for example. First, on the liquid crystal display panel 20 (front panel), chromaticity values X, Y, and Z of display colors when signals R, G, and B are input are measured, and this conversion is expressed by the following formula using three rows. Find a three-column matrix.

Further, based on FIG. 13, chromaticity correction amounts ΔX, ΔY, ΔZ in the respective gradation levels in the liquid crystal display panel 30 (rear panel) are obtained. Then, the correction amounts ΔX, ΔY, ΔZ are converted into signals IR2, IG2, IB2 using the following equations.

The color signal generation unit 71 uses the lookup table LUT prepared in this way to obtain the signals IR2, IG2, and IB2 based on the signal values of the map M30, and maps the signal IR2 to the map M71R and the signal IG2 to the map M71G. , And a map M71B of the signal IB2. The color signal generation unit 71 supplies these maps M71R, M71G, and M71B to the multiplication unit 73.

The backlight map generator 72 generates a backlight map M72 based on the backlight control signal S40. The backlight map M72 represents the intensity of light emitted from the backlight 40 at the light input end (polarizing plate 131) of the liquid crystal display panel 30 (rear panel), and the display resolution of the liquid crystal display panel 30 (rear panel) ( FHD). Then, the backlight map generation unit 72 supplies the backlight map M72 to the multiplication unit 73.

The multiplier 73 multiplies the signal values at the same coordinates in the map M71R and the backlight map M72 to generate a map M73R, and multiplies the signal values at the same coordinates in the map M71G and the backlight map M72, respectively. M73G is generated, and a map M73B is generated by multiplying signal values at the same coordinates in the map M71B and the backlight map M72, respectively. The multiplication unit 73 supplies these maps M73R, M73G, and M73B to the filter unit 74.

The filter unit 74 performs filter processing on each of the maps M73R, M73G, and M73B using an FIR filter. This FIR filter functions as a low-pass filter and corresponds to the light diffusion characteristics of the diffusion plate 9. The filter unit 74 supplies the filter processing results (maps M74R, M74G, and M74B) to the size conversion unit 75.

In this example, the calculation process corresponding to the light diffusion characteristics in the diffusion plate 9 is performed by the filter process. However, the present invention is not limited to this, and instead, for example, a lookup table is used. It may be.

The size converter 75 converts the size of the image by converting the format of the maps M74R, M74G, and M74B from the FHD format to the UHD format. The size conversion unit 75 supplies the conversion results (maps M75R, M75G, and M75B) to the division unit 76.

The division unit 76 generates a map M20R by dividing the signal value at each coordinate in the map of the signal IR included in the image signal Spic by the signal value at that coordinate in the map M75R, and is included in the image signal Spic. The signal value at each coordinate in the map of the signal IG is divided by the signal value at that coordinate in the map M75G to generate a map M20G, and the signal value at each coordinate in the map of the signal IB included in the image signal Spic. Are respectively divided by signal values at the coordinates in the map M75B to generate a map M20B. The division unit 76 outputs these maps M20R, M20G, and M20B using the signal S20.

Here, the correction unit 70 corresponds to a specific example of “first processing unit” in the present disclosure, and the signal generation unit 50 corresponds to a specific example of “second processing unit” in the present disclosure. The liquid crystal display panel 20 corresponds to a specific example of “first liquid crystal display unit” in the present disclosure, and the liquid crystal display panel 30 corresponds to a specific example of “second liquid crystal display unit” in the present disclosure. The maps M20R, M20G, and M20B correspond to a specific example of “first image map” in the present disclosure, and the map M30 corresponds to a specific example of “second image map” in the present disclosure.

The filter unit 55 corresponds to a specific example of “filter unit” in the present disclosure. The luminance map generation unit 52 and the gamma conversion unit 54 correspond to a specific example of “conversion unit” in the present disclosure. The maximum value acquisition units 56A and 56B, the gain calculation unit 57, the gain map generation unit 58, and the multiplication unit 59 correspond to a specific example of “signal adjustment unit” in the present disclosure. The map M55 corresponds to a specific example of “first map” in the present disclosure. The map M54 corresponds to a specific example of “second map” in the present disclosure. The block BL corresponds to a specific example of “first range” in the present disclosure. The number of taps of the filter unit 55 corresponds to a specific example of “second range” in the present disclosure.

The color signal generation unit 71, the backlight map generation unit 72, the multiplication unit 73, and the filter unit 74 correspond to a specific example of “chromaticity adjustment unit” in the present disclosure. The maps M71R, M71G, and M71B correspond to a specific example of “third map” in an embodiment of the present disclosure.

[Operation and Action]
Subsequently, the operation and action of the display device 1 of the present embodiment will be described.

(Overview of overall operation)
First, an overview of the overall operation of the display device 1 will be described with reference to FIGS. In the signal generation unit 50 (FIG. 6), the size conversion unit 51 converts the size of the image by converting the format of the image signal Spic from the UHD format to the FHD format. The luminance map generation unit 52 calculates a luminance value Y based on the signals IR, IG, and IB included in the image signal supplied from the size conversion unit 51, and generates a luminance map M52 including the luminance value Y for one screen. Generate. The filter unit 53 generates a luminance map M53 by performing filter processing on the luminance map M52 to remove noise. The gamma conversion unit 54 generates a map M54 by performing gamma conversion on each luminance value Y of the luminance map M53. The filter unit 55 generates a map M55 by performing filter processing on the map M54 to blur the image. The maximum value acquisition unit 56A obtains the maximum value MAXA of signal values in each block BL based on the map M54. The maximum value acquisition unit 56B obtains the maximum value MAXB of the signal values in each block BL based on the map M55. The gain calculation unit 57 calculates the gain G based on the maximum values MAXA and MAXB in each block BL. The gain map generator 58 generates a gain map M58 by performing linear interpolation processing based on the gain G of each block BL. The multiplier 59 generates a map M30 based on the map M55 and the gain map M58, and outputs it as a signal S30.

The backlight control unit 60 (FIG. 1) generates a backlight control signal S40 based on the image signal Spic. In the correction unit 70 (FIG. 12), the color signal generation unit 71 generates maps M71R, M71G, and M71B for correcting the chromaticity characteristics in the liquid crystal display panel 30 (rear panel) based on the signal S30 (map M30). To do. The backlight map generator 72 generates a backlight map M72 based on the backlight control signal S40. The multiplication unit 73 generates maps M73R, M73G, and M73B based on the maps M71R, M71G, and M71B and the backlight map M72. The filter unit 74 generates maps M74R, M74G, and M74B by performing filter processing on each of the maps M73R, M73G, and M73B. The size conversion unit 75 converts the image size by converting the format of the maps M74R, M74G, and M74B from the FHD format to the UHD format, and generates maps M75R, M75G, and M75B. The division unit 59 generates a map M20R based on the map of the signal IR and the map M75R included in the image signal Spic, generates a map M20G based on the map of the signal IG and the map M75G, and generates a map of the signal IB and the map M75B. Based on the above, a map M20B is generated, and the maps M20R, 20G, and 20B are output as the image signal S20.

(About image quality)
In the display device 1, in the signal generation unit 50 that generates the signal S30 to be supplied to the liquid crystal display panel 30 (rear panel), the filter unit 55 performs the filtering process on the map M54. It is possible to reduce a possibility that a double image is generated in the display image.

15A shows a schematic cross-sectional view of the liquid crystal display panels 20 and 30 and the diffusion plate 9, and FIG. 15B shows the luminance in the liquid crystal display panels 20 and 30. FIG. Since the display element a12 displayed on the liquid crystal display panel 30 (rear panel) is blurred by the filter unit 55, the display element a12 displayed on the liquid crystal display panel 20 (front panel) is wider and wider. The brightness changes gently.

When a user in the direction of the angle φ from the normal direction of the display surface observes such a display image, the display element a11 is observed in the range c11. At this time, in the range c12, the light transmittance in the liquid crystal display panel 20 (front panel) is low, and the light transmittance in the liquid crystal display panel 30 (rear panel) changes gently. Therefore, the display device 1 can reduce the possibility that a double image will be generated in the display image.

That is, for example, when the filter unit 55 is not provided, as shown in FIG. 16, the display element a13 displayed on the liquid crystal display panel 30 (rear panel) is displayed on the liquid crystal display panel 20 (front panel). The width is the same as the element a11, and the change in luminance is steep. At this time, in the range c13, the light transmittance in the liquid crystal display panel 20 (front panel) is low, but the light transmittance in the liquid crystal display panel 30 (rear panel) is high. Therefore, when the transmittance of the liquid crystal display panel 20 (front panel) in this range c13 is not sufficiently low, a double image may be generated in the display image as shown in FIG.

On the other hand, in the display device 1, since the filter unit 55 is provided to blur the image displayed on the liquid crystal display panel 30, the light transmittance in the liquid crystal display panel 30 (rear panel) changes gently. The possibility that a double image will be generated can be reduced. As a result, the display device 1 can improve the image quality.

Further, in the display device 1, as shown in FIG. 7, since the gamma value of the gamma conversion characteristic in the gamma conversion unit 54 is lowered, the possibility that a double image is generated in the display image can be reduced. That is, for example, when the gamma value in the gamma conversion unit 54 is set to “1”, the white portion is reduced in the image displayed on the liquid crystal display panel 30 (rear panel) compared to the case where the gamma value is lower. There are more intermediate gradations. At this time, the display image on the liquid crystal display panel 20 (front panel) becomes brighter. As a result, when the gamma value is set to “1”, the double image may be highlighted. On the other hand, in the display device 1, since the gamma value is lowered, the portion displayed in the intermediate gradation in the display image of the liquid crystal display panel 30 (rear panel) is closer to white, and thus there is a possibility that a double image is generated in the display image. Can be reduced. As a result, the display device 1 can improve the image quality.

Further, in the display device 1, since the correction unit 70 is provided and the chromaticity characteristics in the liquid crystal display panel 30 (rear panel) are corrected, the image quality can be improved. That is, for example, when such a correction unit 70 is not provided, the chromaticity of the display image is shifted according to the chromaticity shift in the liquid crystal display panel 30 (rear panel) as shown in FIG. There is a risk that the image quality will deteriorate. On the other hand, in the display device 1, the correction unit 70 is provided and the chromaticity shift in the liquid crystal display panel 30 (rear panel) is corrected in the liquid crystal display panel 20 (front panel), so that the image quality can be improved.

[effect]
As described above, in the present embodiment, since the image displayed on the liquid crystal display panel 30 (rear panel) is blurred by the filter processing, the possibility that a double image is generated in the display image can be reduced, and the image quality can be reduced. Can be increased.

In this embodiment, since the gamma value in the gamma conversion unit is lowered, the possibility that a double image is generated in the display image can be reduced, and the image quality can be improved.

In the present embodiment, since the chromaticity characteristics in the liquid crystal display panel 30 (rear panel) are corrected, the image quality can be improved.

[Modification 1-1]
In the above embodiment, the gamma conversion unit 54 is provided in the signal generation unit 50. However, the present invention is not limited to this. For example, the gamma conversion unit 54 may be omitted.

[Modification 1-2]
In the above-described embodiment, the filter unit 55 is provided in the signal generation unit 50. However, the filter unit 55 is not limited to this, and instead, for example, the filter unit like a signal generation unit 50A illustrated in FIG. 55 may be omitted. The signal generation unit 50A includes a size conversion unit 51, a luminance map generation unit 52, a filter unit 53, and a gamma conversion unit 54. That is, the signal generation unit 60A includes a filter unit 55, maximum value acquisition units 56A and 56B, a gain calculation unit 57, a gain map generation unit 58, and a multiplication unit from the signal generation unit 50 (FIG. 6) according to the above embodiment. The part 59 is omitted. In the signal generation unit 60A, the gamma conversion unit 54 outputs a map M54 using the signal S30.

<2. Second Embodiment>
Next, the display device 2 according to the second embodiment will be described. In the present embodiment, each sub-pixel 36 of the liquid crystal display panel 30 is driven so as to be selectively set to a transmission state or a blocking state. In addition, the same code | symbol is attached | subjected to the component substantially the same as the display apparatus 1 which concerns on the said 1st Embodiment, and description is abbreviate | omitted suitably.

FIG. 19 shows a configuration example of the display device 2 according to the present embodiment. The display device 2 includes an image processing unit 80. The image processing unit 80 includes a display control unit 81 and a correction unit 90.

The display control unit 81 generates a signal S81 to be supplied to the liquid crystal display panel 30 (rear panel) based on the signal S30 (map M30) of the signal generation unit 50. Specifically, as will be described later, the display control unit 81 sets the state of each sub-pixel 36 of the liquid crystal display panel 30 to a transmission state or a blocking state (a state that does not transmit light) according to each signal value of the map M30. ) Selectively. The display control unit 81 sets the gradation in the sub-pixel 36 by setting the ratio between the time when the sub-pixel 36 is in the transmission state and the time when the sub-pixel 36 is in the blocking state.

FIG. 20 shows a configuration example of the correction unit 90. The correction unit 90 includes a multiplication unit 93, a filter unit 94, a size conversion unit 95, and a division unit 96.

The multiplying unit 93 generates a map M93 by multiplying signal values at the same coordinates in the map M30 and the backlight map M72, respectively, as in the multiplying unit 73 according to the first embodiment. The multiplication unit 93 supplies the map M93 to the filter unit 94.

The filter unit 94 performs a filter process on the map M93 to generate the map M94, similarly to the filter unit 74 according to the first embodiment. The filter unit 94 supplies the map M94 to the size conversion unit 95.

The size conversion unit 95 converts the size of the image by converting the format of the map M94 from the FHD format to the UHD format, similarly to the size conversion unit 75 according to the first embodiment. The size conversion unit 95 supplies the conversion result (map M95) to the division unit 96.

Similarly to the division unit 76 according to the first embodiment, the division unit 96 determines the signal value at each coordinate in the map of the signal IR included in the image signal Spic by the signal value at the coordinate in the map M95. A map M20R is generated by division, and a signal value at each coordinate in the map of the signal IG included in the image signal Spic is divided by a signal value at that coordinate in the map M95 to generate a map M20G. The map M20B is generated by dividing the signal value at each coordinate in the map of the signal IB included in Spic by the signal value at that coordinate in the map M95. The dividing unit 96 outputs these maps M20R, M20G, and M20B using the image signal S20.

This correction unit 90 does not include the color signal generation unit 71, unlike the correction unit 70 (FIG. 12) according to the first embodiment. That is, in the display device 2, each sub-pixel 36 in the liquid crystal display panel 30 (rear panel) is selectively set to a transmission state or a cutoff state, so that the liquid crystal display panel 30 (rear panel) will be described later. Since the possibility that the chromaticity changes can be reduced, the color signal generation unit 71 is omitted.

Here, the correction unit 90 corresponds to a specific example of “first processing unit” in the present disclosure. The display control unit 81 corresponds to a specific example of “third processing unit” in an embodiment of the present disclosure.

FIG. 21 shows operations of four adjacent pixels 35A to 35D in the liquid crystal display panel 30. (A) shows a state in a certain frame period F (n), and (B) shows the next frame. The state in the period F (n + 1) is shown, (C) shows the state in the next frame period F (n + 2), and (D) shows the state in the next frame period F (n + 3). In FIG. 21, the sub-pixels 36 indicated by white indicate a transmission state, and the sub-pixels 36 indicated by diagonal lines indicate a blocking state.

In this example, the signal values at the coordinates corresponding to these four pixels 35A to 35D in the map M30 indicate a gradation level of 25%. Based on this signal value (25%) in the map M30, the display control unit 81 sets each sub-pixel 36 of the corresponding pixel 35A to 35D to the transmission state or the blocking state. Specifically, for example, the three sub-pixels 36 of the pixel 35A located in the upper left of the four pixels 35A to 35D are in a transmission state, a cutoff state, and a transmission state in order from the left in the frame period F (n). (FIG. 21 (A)), and in the frame period F (n + 1), all are in the cut-off state (FIG. 21 (B)), and in the frame period F (n + 2), the cut-off state, transmission state, and cut-off state are entered In FIG. 21 (C)), all are cut off in the frame period F (n + 3) (FIG. 21 (D)). Each sub-pixel 36 is in a transmissive state only in one of the four frame periods F (n) to F (n + 3), and is in a blocking state in the remaining three periods. Thus, in the pixel 35A, each sub-pixel 36 is in a transmission state or a blocking state in a time division manner. Accordingly, the pixel 35A can perform display corresponding to a gradation level of 25%. Further, at this time, since adjacent sub-pixels are prevented from being in the same state as much as possible, for example, flickering of an image can be suppressed and image quality can be improved.

Similarly, the three sub-pixels 36 of the pixel 35B located in the upper right among the four pixels 35A to 35D are all cut off in the frame period F (n) (FIG. 21A), and the frame period F In (n + 1), the blocking state, the transmission state, and the blocking state are entered in order from the left (FIG. 21B), and in the frame period F (n + 2), all are in the blocking state (FIG. 21C), and the frame period F At (n + 3), a transmission state, a blocking state, and a transmission state are obtained (FIG. 21D). In this example, the pixel 35C located at the lower left of the four pixels 35A to 35D operates in the same manner as the pixel 35B, and the pixel 35D located at the lower right of the four pixels 35A to 35D is a pixel. It operates in the same way as 35A. As described above, since the pixels adjacent in the vertical direction and the horizontal direction are prevented from being in the same state as much as possible, for example, flickering of the image can be suppressed and the image quality can be improved.

In the display device 2, the state of each sub-pixel 36 in the liquid crystal display panel 30 (rear panel) is selectively set to one of two states (transmission state and blocking state). In the display panel 30 (rear panel), it is possible to reduce the possibility that the chromaticity changes according to the gradation level. As a result, unlike the first embodiment, the display device 2 can omit the function (color signal generation unit 71) for correcting the chromaticity characteristics in the liquid crystal display panel 30 (rear panel), and thus the correction unit 90. The configuration can be simplified.

As described above, in the present embodiment, the state of each sub-pixel 36 in the liquid crystal display panel 30 (rear panel) is selectively set to the transmission state or the cutoff state, so that the circuit configuration can be simplified.

In the present embodiment, the sub-pixels adjacent to each other are prevented from being in the same state as much as possible in one pixel, so that the image quality can be improved.

In the present embodiment, the pixels adjacent in the vertical direction and the horizontal direction are prevented from being in the same state as much as possible, so that the image quality can be improved.

Other effects are the same as in the case of the first embodiment.

[Modification 2]
You may apply each modification of 1st Embodiment to the display apparatus 2 which concerns on the said embodiment.

The present technology has been described above with some embodiments and modifications. However, the present technology is not limited to these embodiments and the like, and various modifications are possible.

For example, in each of the above-described embodiments, the three sub-pixels 36 are provided in each pixel 35 of the liquid crystal display panel 30 (rear panel). However, the present invention is not limited to this, and instead of this, each pixel 35 Each pixel 35 may be configured as a single section without providing a plurality of sub-pixels.

Further, for example, in each of the above-described embodiments, the backlight 40 is provided with a plurality of light emitting units that can individually set the light emission luminance. However, the present invention is not limited to this, and instead, for example, The light may be emitted with the same brightness over the entire surface.

It should be noted that the effects described in this specification are merely examples and are not limited, and other effects may be obtained.

Note that the present technology may be configured as follows.

(1) a first processing unit that generates a first image map used for display in the first liquid crystal display unit based on the input image map;
A filter unit that performs a filtering process to blur an image based on the input image map and generates a first map; and based on the first map, between the first liquid crystal display unit and a backlight. An image processing apparatus comprising: a second processing unit that generates a second image map used for display on the second liquid crystal display unit arranged.

(2) The second processing unit generates a luminance map including a luminance value in each pixel based on the input image map, and performs gamma conversion on each luminance value of the luminance map, thereby performing the second. A conversion unit for generating a map of
The image processing apparatus according to (1), wherein the filter unit performs the filtering process on the second map.

(3) The image processing apparatus according to (2), wherein a gamma value of a conversion characteristic in the gamma conversion is smaller than 1.

(4) Conversion characteristics between input values and output values in the gamma conversion are as follows:
If the input value is 0, the output value is 0;
If the input value is greater than the first value, the output value is a second value;
The image processing apparatus according to (2) or (3), wherein when the input value is larger than 0 and smaller than the first value, the output value monotonously increases according to the input value.

(5) The second processing unit obtains a gain value based on the second map and the first map, and generates the second image map based on the first map and the gain value. The image processing apparatus according to any one of (2) to (4).

(6) The signal adjustment unit may be configured based on a maximum value of signal values belonging to the first range in the second map and a maximum value of signal values belonging to the first range in the first map. The gain value for the signal value belonging to the first range in the first map is obtained. The image processing device according to (5).

(7) The filter unit performs the filtering process by sequentially moving the second range in the second map and weighting and adding the signal values belonging to each second range,
The size of the second range corresponds to a distance between the first liquid crystal display unit and the second liquid crystal display unit. The image processing apparatus according to (6).

(8) The image processing apparatus according to (7), wherein the first range is larger than the second range.

(9) The first processing unit includes:
A chromaticity adjusting unit that generates a third map corresponding to a change in chromaticity when the gradation in the second liquid crystal display unit is changed based on the second image map;
The image processing device according to any one of (1) to (8), wherein the first image map is generated based on the input image map and the third map.

(10) The image processing according to (9), wherein the chromaticity adjustment unit corrects the third map based on an intensity map of light input from the backlight to the second liquid crystal display unit. apparatus.

(11) The chromaticity adjustment unit corrects the third map based on a light propagation characteristic from the second liquid crystal display unit to the first liquid crystal display unit. Image processing device.

(12) Based on the second image map, the state of each subpixel in the second liquid crystal display unit is selectively set to a transmission state or a blocking state, and each subpixel is set to the transmission state. The image processing apparatus according to any one of (1) to (8), further including a third processing unit that sets a ratio between time and the time for the shut-off state.

(13) The third processing unit sets a state of each sub-pixel so that sub-pixels adjacent to each other are not in the same state in each pixel in the second liquid crystal display unit, The image processing apparatus according to (12), wherein the state of each sub-pixel is set so that pixels adjacent in the horizontal direction are not in the same state.

(14) The image processing device according to (12) or (13), wherein the first processing unit generates the first image map based on the input image map and the second image map.

(15) The first liquid crystal display unit displays a color image;
The image processing apparatus according to any one of (1) to (14), wherein the second liquid crystal display unit displays a monochrome image.

(16) a first processing unit that generates a first image map used for display in the first liquid crystal display unit based on the input image map;
A conversion unit that generates a luminance map including a luminance value in each pixel based on the input image map and generates a second map by performing gamma conversion on each luminance value of the luminance map; A second processing unit for generating a second image map used for display on the second liquid crystal display unit disposed between the first liquid crystal display unit and the backlight, based on the second map; An image processing apparatus.

(17) The second processing unit includes:
A filter unit that generates a first map by performing a filtering process to blur an image based on the second map;
The image processing device according to (16), wherein the second image map is generated based on the first map.

(18) generating a first image map used for display in the first liquid crystal display unit based on the input image map;
Performing a filtering process to blur the image based on the input image map to generate a first map;
An image processing method for generating a second image map used for display on a second liquid crystal display unit disposed between the first liquid crystal display unit and a backlight based on the first map.

(19) generating a first image map used for display in the first liquid crystal display unit based on the input image map;
Based on the input image map, a luminance map including a luminance value in each pixel is generated, and a second map is generated by performing gamma conversion on each luminance value of the luminance map,
An image processing method for generating a second image map used for display in a second liquid crystal display unit disposed between the first liquid crystal display unit and a backlight based on the second map.

This application claims priority on the basis of Japanese Patent Application No. 2014-215270 filed on October 22, 2014 at the Japan Patent Office. The entire contents of this application are hereby incorporated by reference. Incorporated into.

Those skilled in the art will envision various modifications, combinations, subcombinations, and changes, depending on design requirements and other factors, which are within the scope of the appended claims and their equivalents. It is understood that

Claims (19)

1. A first processing unit for generating a first image map used for display in the first liquid crystal display unit based on the input image map;
   A filter unit that performs a filtering process to blur an image based on the input image map and generates a first map; and based on the first map, between the first liquid crystal display unit and a backlight. An image processing apparatus comprising: a second processing unit that generates a second image map used for display on the second liquid crystal display unit arranged.
2. The second processing unit generates a luminance map including a luminance value in each pixel based on the input image map, and performs a gamma conversion on each luminance value of the luminance map to obtain the second map. A conversion unit for generating,
   The image processing apparatus according to claim 1, wherein the filter unit performs the filtering process on the second map.
3. The image processing apparatus according to claim 2, wherein a gamma value of a conversion characteristic in the gamma conversion is smaller than 1. 4.
4. Conversion characteristics between input values and output values in the gamma conversion are as follows:
   If the input value is 0, the output value is 0;
   If the input value is greater than the first value, the output value is a second value;
   The image processing apparatus according to claim 2, wherein when the input value is larger than 0 and smaller than the first value, the output value monotonously increases according to the input value.
5. The second processing unit obtains a gain value based on the second map and the first map, and generates a second image map based on the first map and the gain value. The image processing apparatus according to claim 2, further comprising: a unit.
6. The signal adjustment unit is configured to determine the first value of the signal value belonging to the first range in the second map and the maximum value of the signal value belonging to the first range in the first map. The image processing apparatus according to claim 5, wherein a gain value for a signal value belonging to the first range in one map is obtained.
7. The filter unit performs the filtering process by sequentially moving the second range in the second map and weighting and adding signal values belonging to each second range,
   The image processing apparatus according to claim 6, wherein the size of the second range corresponds to a distance between the first liquid crystal display unit and the second liquid crystal display unit.
8. The image processing apparatus according to claim 7, wherein the first range is larger than the second range.
9. The first processing unit includes:
   A chromaticity adjusting unit that generates a third map corresponding to a change in chromaticity when the gradation in the second liquid crystal display unit is changed based on the second image map;
   The image processing apparatus according to claim 1, wherein the first image map is generated based on the input image map and the third map.
10. The image processing apparatus according to claim 9, wherein the chromaticity adjustment unit corrects the third map based on an intensity map of light input from the backlight to the second liquid crystal display unit.
11. The image processing apparatus according to claim 9, wherein the chromaticity adjustment unit corrects the third map based on a propagation characteristic of light from the second liquid crystal display unit to the first liquid crystal display unit.
12. Based on the second image map, the state of each sub-pixel in the second liquid crystal display unit is selectively set to a transmission state or a blocking state, and the time when each sub-pixel is in the transmission state and the time The image processing apparatus according to claim 1, further comprising: a third processing unit that sets a ratio with respect to a time for the blocking state.
13. The third processing unit sets a state of each sub-pixel so that sub-pixels adjacent to each other in each pixel in the second liquid crystal display unit are not in the same state, and in the vertical direction and the horizontal direction. The image processing apparatus according to claim 12, wherein the state of each sub-pixel is set so that adjacent pixels are not in the same state.
14. The image processing apparatus according to claim 12, wherein the first processing unit generates the first image map based on the input image map and the second image map.
15. The first liquid crystal display unit displays a color image;
    The image processing apparatus according to claim 1, wherein the second liquid crystal display unit displays a monochrome image.
16. A first processing unit for generating a first image map used for display in the first liquid crystal display unit based on the input image map;
    A conversion unit that generates a luminance map including a luminance value in each pixel based on the input image map and generates a second map by performing gamma conversion on each luminance value of the luminance map; A second processing unit for generating a second image map used for display on the second liquid crystal display unit disposed between the first liquid crystal display unit and the backlight, based on the second map; An image processing apparatus.
17. The second processing unit includes:
    A filter unit that generates a first map by performing a filtering process to blur an image based on the second map;
    The image processing apparatus according to claim 16, wherein the second image map is generated based on the first map.
18. Based on the input image map, a first image map used for display in the first liquid crystal display unit is generated,
    Performing a filtering process to blur the image based on the input image map to generate a first map;
    An image processing method for generating a second image map used for display on a second liquid crystal display unit disposed between the first liquid crystal display unit and a backlight based on the first map.
19. Based on the input image map, a first image map used for display in the first liquid crystal display unit is generated,
    Based on the input image map, a luminance map including a luminance value in each pixel is generated, and a second map is generated by performing gamma conversion on each luminance value of the luminance map,
    An image processing method for generating a second image map used for display in a second liquid crystal display unit disposed between the first liquid crystal display unit and a backlight based on the second map.

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