WO2012105369A1 - Display device - Google Patents

Abstract

This display device (1) is provided with a color display layer (3) having pixels for the four colors RGBY and a polarization control filter (6). The polarization control filter (6) includes two types of polarization regions (6a, 6b) having mutually different light polarization states. The Y-color pixels of the color display layer (3) are arranged in positions corresponding to the boundary of the two types of polarization regions (6a, 6b). In a case where a three-dimensional image is displayed, the Y-color pixels are displayed dark, and the three-dimensional image is displayed using pixels other than the Y-color pixels among the pixels for the four colors.

Description

Display device

The present invention relates to a display device that displays a two-dimensional image and a three-dimensional image.

As a method for allowing the user to perceive an image displayed on the screen as a stereoscopic three-dimensional image, there is a method using a display device that makes the polarization state of the left-eye pixel and the polarization state of the right-eye pixel displayed on the screen different. is there. By viewing the screen through glasses with a left-eye lens that allows only light from the left-eye pixel to pass and a right-eye lens that allows only light from the right-eye pixel to pass, The original image can be perceived. The difference between the left and right polarization states may be a difference in polarization direction or a difference in rotation direction of circularly polarized light.

In order to change the polarization state of the left and right images, two types of polarization control filters (for example, polarizing plates) are arranged so as to correspond to the left eye pixel and the right eye pixel, respectively, and the polarization of the left eye image There is a display device in which the direction and the polarization direction of the right-eye image are different. However, in the conventional configuration in which the polarization control filters are simply arranged, the division of the left-eye image and the right-eye image near the boundary of the polarization control filter whose polarization direction changes is insufficient.

FIG. 5 is a plan view schematically showing a part of the arrangement of the polarization control filter and the pixels of the conventional display device. FIG. 5 shows a correspondence relationship between the color display layer 101 and the polarization control filter 102 overlapping the color display layer 101. The left and right polarization regions 102a and 102b of the polarization control filter 102 extend in the horizontal direction (row direction) of the screen, and are alternately arranged in the vertical direction (column direction). The color display layer 101 has pixels of three colors of RBG corresponding to the right and left polarization regions 102a and 102b. For example, one left-eye pixel representing full color corresponds to a region surrounded by a dotted line shown in FIG.

FIG. 6 is a sectional view schematically showing a longitudinal section of a conventional display device. Here, a cross section along a pixel of B (blue) color is shown. A color display layer 101 is provided on the glass substrate 103, and another glass substrate 104 is provided on the color display layer 101. The color display layer 101 includes a liquid crystal element, a color filter, and the like. A polarizing plate 105 is provided on the glass substrate 104, and a polarization control filter 102 is provided on the polarizing plate 105. The polarization control filter 102 is configured by a phase difference plate having a different optical axis direction for each of the right and left polarization regions 102a and 102b. A backlight (not shown) is disposed below the glass substrate 103. The user sees the light exiting from the polarization control filter 102.

When the user is in front of the display device, as shown in FIG. 6, the light of the left eye image emitted from the left eye pixel passes through the left eye polarization region 102 a of the polarization control filter 102 and reaches the user. To do. Similarly, the right-eye image light emitted from the right-eye pixel passes through the right-eye polarization region 102 b of the polarization control filter 102 and reaches the user. At this time, it is assumed that the light passing through the left-eye polarizing region 102a is polarized in the vertical direction, and the light passing through the right-eye polarizing region 102b is polarized in the horizontal direction. The user visually recognizes images corresponding to the left and right eyes through the polarizing glasses.

On the other hand, when the user is not in front of the display device and is viewing the screen from an oblique position, the user sees light emitted obliquely from the polarization control filter 102 of the display device. Here, the case where the screen of the display device is looked up from below or from above is considered. The left and right polarizing regions 102a and 102b extend in the horizontal direction of the screen.

FIG. 7 corresponds to FIG. 6 and is a diagram for explaining a light path when viewed from an oblique direction in a conventional display device. Part of the light emitted from the left-eye pixel of the color display layer 101 reaches the user through the right-eye polarization region 102b at a position corresponding to the vicinity of the boundary between the left and right polarization regions 102a and 102b. . Therefore, a phenomenon (crosstalk) occurs in the user's right eye that a part of the image for the left eye is mixed and visually recognized in addition to the image for the right eye.

In order to suppress the occurrence of this crosstalk, there is a method in which a light absorption part is provided at the boundary between right and left polarization regions of the polarization control filter (Patent Document 1). Since the light absorption part absorbs light near the boundary between the right and left polarization regions, the left and right images are well separated, and a clear three-dimensional image can be visually recognized by the user.

Further, in order to suppress the occurrence of crosstalk, each color pixel of the color display layer 101 is composed of a first sub-pixel and a second sub-pixel, and the first sub-pixel is located at a position corresponding to the boundary of the left and right polarization regions. There is a method of arranging pixels (Patent Document 2). When displaying a three-dimensional image, the first subpixel located at the position corresponding to the boundary between the left and right polarization regions is displayed in black, and the image is displayed only with the second subpixel. Thereby, generation | occurrence | production of crosstalk can be suppressed similarly to the structure which arrange | positions the light absorption part.

Japanese Patent Publication “Japanese Patent Laid-Open No. 2002-185983 (published on June 28, 2002)” Japanese Patent Publication “JP 2010-204389 A (published on September 16, 2010)”

In the configuration of Patent Document 1 in which a light-absorbing part is provided in the polarization control filter, the luminance is lowered by the light-absorbing part.

In that respect, in the configuration of Patent Document 2 in which a plurality of sub-pixels are provided, when a two-dimensional image is displayed, a bright image is displayed in the display of the two-dimensional image by using the first sub-pixel in addition to the second sub-pixel. can do.

However, in the configuration of Patent Document 2 in which a plurality of sub-pixels are provided, each of the first sub-pixel and the second sub-pixel has an individual gate bus line, so that it is actually formed in the display device compared to a normal display device. The number of pixels increases. For example, since it is necessary to provide the first sub-pixel and the second sub-pixel for each color pixel, the actual number of pixels formed in the display device is twice the normal number. For example, when a first sub-pixel and a second sub-pixel are provided for a display device that displays a full high-definition (1920 × 1080) resolution in the display of a two-dimensional image, a total of 1920 × 1080 × 3 (RGB) × 2 Sub-pixels are required. The two left and right three-dimensional images are each represented by, for example, 1920 × 540 × 3 (RGB) pixels (a total of 1920 × 1080 × 3 (RGB) pixels). Since it is necessary to form a total of n times as many pixels depending on the types of sub-pixels to be provided, problems such as an increase in manufacturing cost and a decrease in yield occur. In addition, since the number of pixels per area increases, the aperture ratio decreases, and the brightness during two-dimensional image display also decreases.

The present invention has been made in view of the above-described problems, and an object thereof is to suppress a crosstalk in displaying a three-dimensional image so that a clear three-dimensional image can be visually recognized. It is to realize a display device that does not impair the brightness.

A display device according to the present invention is a display device capable of displaying a two-dimensional image and a three-dimensional image, and in order to solve the above problems, a color display layer having pixels of a plurality of colors, and the color display layer And a polarization control layer that controls the polarization state of the light emitted from the pixel, the polarization control layer includes two types of polarization regions that make the polarization state of the light different from each other, The pixels of the first color of the color display layer are arranged at positions corresponding to the boundaries between the two types of polarization regions, and when displaying a three-dimensional image, the pixels of the first color are darkly displayed. The three-dimensional image is displayed by pixels excluding the first color pixel among the plurality of color pixels.

According to the above configuration, the first color pixel is arranged at a position corresponding to the boundary between the two types of polarization regions, and the first color pixel is used when displaying a three-dimensional image. The image is displayed with pixels of other colors. Therefore, the occurrence of crosstalk when displaying a three-dimensional image can be suppressed, and the two-dimensional image can be displayed brightly. Further, according to the above configuration, the total number of pixels can be reduced as compared with the prior art, and a reduction in manufacturing cost, an improvement in yield, and an improvement in luminance due to an improvement in aperture ratio can be realized. .

The dark display may be a black display or a dark (low brightness) intermediate gradation display.

As described above, according to the display device of the present invention, it is possible to suppress the occurrence of crosstalk when displaying a three-dimensional image, and to display a two-dimensional image brightly. In addition, reduction in manufacturing cost, improvement in yield, and improvement in luminance due to improvement in aperture ratio can be realized.

It is a figure which shows the functional structure of the display apparatus which concerns on one Embodiment of this invention. 1 is a cross-sectional view schematically showing a cross section in a vertical (vertical) direction on a display screen of a display device according to an embodiment of the present invention. It is a top view which shows roughly a part of arrangement | positioning of the polarization control filter and pixel of the display apparatus which concerns on one Embodiment of this invention. It is a top view which shows roughly a part of arrangement | positioning of the polarization control filter and pixel of the display apparatus which concerns on other embodiment of this invention. It is a top view which shows roughly a part of arrangement | positioning of the polarization control filter and pixel of the conventional display apparatus. It is sectional drawing which shows the cross section of the vertical direction of the conventional display apparatus roughly. FIG. 7 corresponds to FIG. 6 and illustrates a light path when viewed from an oblique direction in a conventional display device.

[Embodiment 1]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a diagram showing a functional configuration of the display device 1 of the present embodiment. The display device 1 includes a gradation determination unit 10, a display signal generation unit 11, and an image display unit 12. The image display unit 12 has four color pixels of R (red), G (green), B (blue), and Y (yellow) in order to display an image. When displaying a two-dimensional image, the display device 1 of the present embodiment displays an image using RGBY four-color pixels, and when displaying a three-dimensional image, uses RGB three-color pixels. Display an image.

When displaying a two-dimensional image, the gradation determination unit 10 determines the gradation of each pixel for displaying the image indicated by the input video signal using RGBY four-color pixels. In addition, when displaying a three-dimensional image, the gradation determination unit 10 determines the gradation of each pixel for displaying the image indicated by the input video signal using RGB three-color pixels. In the case of displaying using four colors of RGBY and the case of displaying using three colors of RGB, even if the same color specified by the same video signal is expressed, the luminance of each pixel of RGB is naturally Different. The gradation determination unit 10 outputs the determined gradation data of each pixel to the display signal generation unit 11.

The display signal generation unit 11 generates a signal for controlling the gate driver 13 and the data driver 14 included in the image display unit 12 in order to control the luminance (gradation) of each pixel, and outputs the signal to the gate driver 13 and the data driver 14. To do. When the gate driver 13 and the data driver 14 output a signal to each pixel of the display screen 15, an image is written to each pixel (the gradation of each pixel is controlled).

FIG. 2 is a cross-sectional view schematically showing a cross section in the vertical (vertical) direction on the display screen of the display device 1 of the present embodiment. Arrows in the figure show examples of light paths. The display device 1 is a liquid crystal display device that can display a two-dimensional image and a three-dimensional image. The display device 1 includes a glass substrate 2, a color display layer 3, a glass substrate 4, a polarizing plate 5, and a polarization control filter (polarization control layer) 6. Further, the display device 1 includes a light source (not shown) arranged behind the glass substrate 2 (downward in FIG. 2).

The color display layer 3 is formed on the glass substrate 2 and has a plurality of pixels composed of a liquid crystal element, a color filter, and the like. The color display layer 3 has four color pixels of R (red), G (green), B (blue), and Y (yellow). In FIG. 2, the color of each pixel is shown in RGBY. A glass substrate 4 is disposed on the color display layer 3. A polarizing plate 5 is disposed on the glass substrate 4. A polarization control filter 6 is disposed on the polarizing plate 5.

The light is irradiated from below the glass substrate 2 to the color display layer 3 by the backlight. The light emitted from each pixel of the color display layer 3 becomes light polarized in a certain direction through the polarizing plate 5. Here, the polarization direction of the light passing through the polarizing plate 5 is a vertical polarization direction for convenience.

The polarization control filter 6 includes a phase plate and has two types of polarization regions 6a and 6b corresponding to the left and right eyes. The phase plate is a half-wave plate, and the half-wave plate is arranged in the polarizing region 6a for the left eye so that the optical axis of the half-wave plate coincides with the polarization direction of the light that has passed through the polarizing plate 5. Is arranged. In the right-eye polarizing region 6b, a half-wave plate is disposed so that the polarization direction of the light passing through the polarizing plate 5 and the optical axis of the half-wave plate are at an angle of 45 °. Yes. That is, light polarized in the vertical direction is emitted from the polarization region 6a for the left eye, and light polarized in the horizontal direction is emitted from the polarization region 6b for the right eye.

FIG. 3 is a plan view schematically showing a part of the arrangement of the polarization control filter 6 and the pixels of the display device of the present embodiment. In FIG. 3, the polarization control filter 6 and the color display are shown in order to show the correspondence relationship between the polarization control filter 6 viewed from the normal direction of the screen of the display device and the arrangement of the pixels of the color display layer 3 overlapping the polarization control filter 6. Layer 3 is shown side by side. In FIG. 3, the polarization direction of light from each of the polarization regions 6 a and 6 b is represented by an arrow, and the color of each pixel is illustrated by RGBY.

The left and right polarization regions 6a and 6b of the polarization control filter 6 extend in the horizontal direction (row direction) of the screen, and are alternately arranged in the vertical direction (column direction). The RGBY four color pixels of the color display layer 3 are arranged in order in the direction in which the left and right polarizing regions 6a and 6b are alternately arranged (that is, the vertical direction). Then, Y pixels are arranged at positions corresponding to (overlapping) the boundaries between the left and right polarizing regions 6a and 6b. The other RGB pixels are arranged at positions that do not correspond to the boundaries of the left and right polarizing regions 6a and 6b (do not overlap in the vicinity of the boundaries). Three pixels of RGB arranged in succession are arranged at positions corresponding to one polarization region 6a (or polarization region 6b).

When displaying a two-dimensional image, the display device 1 displays the two-dimensional image using four colors of RGBY pixels. When the user views the two-dimensional image displayed by the display device 1, polarized glasses are not used, and thus the polarization direction of light of each pixel is not related to the visual recognition of the two-dimensional image. Since the display device 1 expresses a two-dimensional image with four colors of RGBY, a wider color region can be expressed than when an image is expressed with three colors of RGB.

On the other hand, when displaying a three-dimensional image, the display device 1 displays a Y-color pixel among the four colors as black (dark display) and displays a right-and-left three-dimensional image using the RGB three-color pixels. To do. That is, the display device 1 displays an image for the left eye using pixels of three colors of RGB corresponding to the polarization region 6a for the left eye, and three colors of RGB corresponding to the polarization region 6b for the right eye. An image for the right eye is displayed using pixels. Since the display device 1 displays a three-dimensional image using the three primary colors of RGB, it can express full color.

FIG. 2 shows a path of light emitted obliquely from the screen of the display device 1 (from the polarization control filter 6). In the display device 1, Y color pixels are arranged at positions corresponding to the boundaries between the left-eye polarization region 6a and the right-eye polarization region 6b. Therefore, even when the user views the screen from a certain angle (below or above), the light emitted from one left-eye pixel 3a composed of three colors of RGB is used for one left-eye of the polarization control filter 6. It passes through the polarization region 6a and reaches the user. Therefore, since the left and right images are well separated and enter the left and right eyes of the user, the user can visually recognize a clear three-dimensional image. The same applies to the image for the right eye. That is, the user's viewpoint that allows the left and right images to be separated and visually recognized by displaying the color pixels (Y) positioned corresponding to the boundaries between the left and right polarizing regions 6a and 6b in black. The angle range can be expanded.

According to the display device 1 of the present embodiment, in the display of a three-dimensional image, it is possible to suppress the occurrence of crosstalk without providing a light absorbing portion or the like at the boundary between the left and right polarization regions 6a and 6b of the polarization control filter 6. Can do. Therefore, the aperture ratio can be increased, and an image can be displayed brightly because the image is displayed using four color pixels in the display of the two-dimensional image. In the present embodiment, for example, when displaying a full high-definition (1920 × 1080) resolution in displaying a two-dimensional image, the display device 1 only needs to have 1920 × 1080 × 4 (RGBY) pixels. The two-dimensional image is represented by 1920 × 1080 × 4 (RGBY) pixels, and the two left and right three-dimensional images are each 1920 × 540 × 3 (RGB) pixels (a total of 1920 × 1080 × 3 (RGB) pixels). The display device 1 of the present embodiment can suppress the total number of pixels to 2/3 times that of the configuration of Patent Document 2. Therefore, according to this embodiment, it is possible to reduce the manufacturing cost, improve the yield, and improve the luminance by improving the aperture ratio.

(Modification)
The pixels arranged at the boundary between the left and right polarizing regions 6a and 6b are not limited to the Y color pixels. Further, instead of Y, white (W) pixels may be arranged at the boundary between the left and right polarizing regions 6a and 6b, and a two-dimensional image may be displayed in RGBW and a three-dimensional image may be displayed in RGB. In addition, the pixels of the color to be displayed (not used) in black when displaying the three-dimensional image are arranged at the boundary between the left and right polarizing regions 6a and 6b, and the pixels of each color used in displaying the three-dimensional image are arranged. It is only necessary to arrange the pixels in positions not corresponding to the boundaries between the right and left polarizing regions 6a and 6b, and it is not necessary to arrange the pixels in one line. For example, when a three-dimensional image is displayed, the direction in which the images of the color to be displayed in black are continuously arranged (the horizontal direction in FIG. 3) and the direction in which the left and right polarizing regions (boundaries) extend coincide with each other. Good.

Further, the right and left polarization regions may be different from each other in the rotation direction of circularly polarized light instead of the direction of linearly polarized light.

In the above description, a display device in which each pixel of the color display layer includes a liquid crystal element has been described. However, the present invention is not limited to this, and the present invention may be applied to a display device such as an organic EL or plasma system.

[Embodiment 2]
Next, an example in which the pixel arrangement is different from that in the first embodiment will be described in this embodiment. For convenience of explanation, members / configurations having the same functions as those in the drawings described in the first embodiment are given the same reference numerals, and detailed descriptions thereof are omitted. This embodiment will be described with reference to FIG. In the present embodiment, the display device has pixels of five colors obtained by adding cyan (C) to RGBY.

FIG. 4 is a plan view schematically showing a part of the arrangement of the polarization control filter 6 and the pixels of the display device of the present embodiment. 4, in order to show the correspondence between the polarization control filter 6 viewed from the normal direction of the screen of the display device and the arrangement of the pixels of the color display layer 3 overlapping the polarization control filter 6, as in FIG. The control filter 6 and the color display layer 3 are shown side by side.

The configuration of the polarization control filter 6 is the same as that of the first embodiment. The C (cyan) color pixel of the color display layer 7 is disposed at a position corresponding to the boundary between the right and left polarization regions 6a and 6b. The other RGBY four-color pixels are arranged in order in the horizontal direction at positions that do not correspond to the boundaries of the left and right polarization regions 6a and 6b between the C-color pixels.

The display device of the present embodiment displays a two-dimensional image using pixels of five colors of RGBYC when displaying a two-dimensional image. On the other hand, when displaying a three-dimensional image, this display device displays a three-dimensional image for left and right using four pixels of RGBY in which C pixels of five colors are displayed in black.

In addition, when displaying a three-dimensional image, you may display using only three colors among five colors. In this case, the three color pixels to be used may be arranged at positions that do not correspond to the boundaries between the right and left polarizing regions 6a and 6b. In addition, it is desirable that the pixels used for displaying the three-dimensional image include at least pixels of three primary colors of RGB. That is, it is desirable to arrange the RGB three-color pixels at positions that do not correspond to the boundaries between the left and right polarizing regions 6a and 6b.

The number of pixel colors applicable to the present invention is not limited to the above example (four colors of RGBY, five colors of RGBYC), and may be two colors, three colors, or six colors or more. Among them, the color pixel positioned at the boundary between the right and left polarization regions may be displayed in black when the three-dimensional image is displayed.

[Other variations]
A display device according to one embodiment of the present invention is a display device capable of displaying a two-dimensional image and a three-dimensional image, and in order to solve the above-described problem, a color display layer having a plurality of color pixels; A polarization control layer arranged to overlap the color display layer and controlling the polarization state of the light emitted from the pixel, and the polarization control layer includes two types of polarization regions that make the polarization state of the light different from each other. The pixels of the first color of the color display layer are arranged at positions corresponding to boundaries between the two types of polarization regions, and when displaying a three-dimensional image, the pixels of the first color are Dark display is performed, and a three-dimensional image is displayed by pixels excluding the first color pixel among the plurality of color pixels.

Further, when displaying a three-dimensional image, the three-dimensional image may be displayed only with pixels of a color arranged at a position not corresponding to the boundary between the two types of polarization regions among the pixels of the plurality of colors. .

According to the above configuration, the first color pixel is arranged at a position corresponding to the boundary between the two types of polarization regions, and the first color pixel is used when displaying a three-dimensional image. The image is displayed with pixels of other colors. Therefore, the occurrence of crosstalk when displaying a three-dimensional image can be suppressed, and the two-dimensional image can be displayed brightly. Further, according to the above configuration, the total number of pixels can be reduced as compared with the prior art, and a reduction in manufacturing cost, an improvement in yield, and an improvement in luminance due to an improvement in aperture ratio can be realized. .

The dark display may be a black display or a dark (low brightness) intermediate gradation display.

Further, when displaying a two-dimensional image, the two-dimensional image may be displayed by the plurality of color pixels including the first color pixel.

According to the above configuration, the display of the two-dimensional image can be brightened.

Further, the color display layer may include pixels of four or more colors, and the pixels of the three primary colors of red, green, and blue may be arranged at positions that do not correspond to the boundary between the two types of polarization regions.

According to the above configuration, when displaying a three-dimensional image, a full-color image can be displayed using the three primary color pixels.

Further, when displaying a two-dimensional image, the gradation of each pixel is determined so that the image indicated by the input video signal is represented by the pixels of the plurality of colors including the pixels of the first color. When displaying an image, a gradation determination unit that determines the gradation of each pixel so that the image indicated by the input video signal is represented by pixels other than the pixels of the first color among the pixels of the plurality of colors. The structure provided may be sufficient.

According to the above configuration, for example, when displaying a two-dimensional image using pixels of all colors, and when displaying a three-dimensional image using pixels of a smaller number of colors, the level of each pixel is displayed. The tone can be controlled to the optimum gradation.

The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

The present invention can be used for a display device that displays a two-dimensional image and a three-dimensional image.

DESCRIPTION OF SYMBOLS 1 Display apparatus 2 Glass substrate 3, 7 Color display layer 3a, 3b Pixel 4 Glass substrate 5 Polarizing plate 6 Polarization control filter (polarization control layer)
6a, 6b Polarization region 10 Gradation determination unit 11 Display signal generation unit 12 Image display unit 13 Gate driver 14 Data driver

Claims (5)

A display device capable of displaying a two-dimensional image and a three-dimensional image,
A color display layer having pixels of a plurality of colors;
A polarization control layer arranged to overlap the color display layer and controlling the polarization state of the light emitted from the pixel,
The polarization control layer includes two types of polarization regions that make the polarization states of light different from each other,
The pixel of the first color among the pixels of the plurality of colors of the color display layer is disposed at a position corresponding to the boundary between the two types of polarization regions,
When displaying a three-dimensional image, the first color pixels are darkly displayed, and the three-dimensional image is displayed by pixels excluding the first color pixels among the plurality of color pixels. apparatus. 2. When displaying a three-dimensional image, the three-dimensional image is displayed only with pixels of a color arranged at a position not corresponding to the boundary between the two kinds of polarization regions among the pixels of the plurality of colors. The display device described in 1. 3. The display device according to claim 1, wherein when displaying a two-dimensional image, the two-dimensional image is displayed by the pixels of the plurality of colors including the pixels of the first color. The color display layer has four or more pixels,
4. The display device according to claim 1, wherein the pixels of the three primary colors of red, green, and blue are arranged at positions that do not correspond to a boundary between the two types of polarization regions. 5. . When displaying a two-dimensional image, the gradation of each pixel is determined so that the image indicated by the input video signal is represented by the pixels of the plurality of colors including the pixels of the first color, and the three-dimensional image is displayed. When displaying, a gradation determination unit is provided that determines the gradation of each pixel so that the image indicated by the input video signal is represented by pixels excluding the first color pixel among the plurality of color pixels. The display device according to claim 1, wherein:

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