JP2008170830A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve light transmittance of a liquid crystal display panel having color filters. <P>SOLUTION: The liquid crystal display device 100 is equipped with: the liquid crystal display panel 1 which has an array substrate 5 comprising a plurality of pixel electrodes arranged in a matrix, and scanning lines and data lines arranged so as to surround the respective pixel electrodes, a counter substrate 6 facing the array substrate 5 and having a liquid crystal layer 4 interposed therebetween, and a color filter section 8 arranged on the counter substrate 6 in accordance with arrangement of the pixel electrodes, and having the color filters with a plurality of colors arranged in an extending direction of the scanning lines with repeated various colors; a surface light source section 2 to irradiate the liquid crystal display panel 1 with light from the rear side; and a parallax barrier 3 arranged on the front side of the liquid crystal display panel 1 away from the color filter section 8. The color filters 8r, 8g, 8b of respective colors have widths corresponding to two pixels in the extending direction of the scanning lines, and a black matrix 8k is arranged between adjacent color filters with different colors. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device capable of simultaneously displaying different images depending on parallax.

  Conventionally, various techniques relating to a liquid crystal display device capable of two-screen display using parallax have been proposed (see, for example, Patent Document 1). FIG. 5 shows a cross-sectional structure of a conventional liquid crystal display device capable of two-screen display. As shown in FIG. 5, the liquid crystal display device includes a liquid crystal display panel 401, a surface light source unit 402 that irradiates light from the back surface to the liquid crystal display panel 401, and a front surface side of the liquid crystal display panel 401. And a parallax barrier 403 having a target opening 403a and a light shielding portion 403b.

In the liquid crystal display panel 401, a plurality of pixel electrodes are arranged in a matrix, and a liquid crystal layer 404 is sandwiched between the array substrate 405 and an array substrate 405 in which scanning lines and data lines are arranged so as to surround each pixel electrode. Counter substrate 406. Further, the counter substrate 406 is arranged in correspondence with the arrangement of the pixel electrodes, and is a stripe arranged by repeating the red filter 408r, the green filter 408g, and the blue filter 408b in the scanning line extending direction (left-right direction in the figure). A shaped color filter portion 408 is provided. The red filter 408r, the green filter 408g, and the blue filter 408b have a width corresponding to one pixel in the extending direction of the scanning line, and a black matrix 408k is disposed between adjacent different color filters. For the sake of simplicity, FIG. 5 shows a schematic liquid crystal display panel in which the number of color filters in the extending direction of the scanning lines is six.
JP 2006-154759 A

  As described above, in the case of the parallax barrier method in which a parallax barrier is provided on the front surface of the liquid crystal display panel to control the left and right viewing angles, a pixel for right side display and a pixel for left side display are necessary. The number must be double that of the case where no parallax barrier is provided, and it is necessary to prepare a high-definition color filter with a narrow pitch in the left-right direction. The black matrix arranged between adjacent color filters is set to a width that allows for a margin of alignment accuracy between the color filter portion and the array substrate. However, in the case of a high-definition color filter in the left-right direction, since the width of the black matrix with respect to the pixel pitch is relatively large, there is a problem that the light transmittance of the liquid crystal display panel is lowered.

  An object of the present invention is to improve the light transmittance of a liquid crystal display panel having a color filter.

  The present invention is a liquid crystal display device that displays different images depending on parallax, in which a plurality of pixel electrodes are arranged in a matrix, and a switching element and a scanning line and a data line for driving the switching element are surrounded by each pixel electrode. An array substrate arranged in such a manner as to face the array substrate and have a common electrode with a liquid crystal layer sandwiched between the array substrate and either the array substrate or the counter substrate On the other hand, a liquid crystal display panel having a plurality of color filters arranged corresponding to the arrangement of the pixel electrodes and arranged with different colors in the extending direction of the scanning lines, and the liquid crystal display panel A surface light source unit disposed on the back surface for irradiating the liquid crystal display panel with light; and disposed on the front side of the liquid crystal display panel, spaced apart from the color filter, and extending the scanning lines. A matrix-like array of pixel electrodes with a predetermined number of pixel electrodes in a direction is used as one block, each block has a common optical aperture, and the color filter is selected according to a predetermined observation angle with respect to a certain direction. A parallax barrier that is visible, and each color filter is arranged in blocks and has a width corresponding to the predetermined number of pixels in the extending direction of the scanning line, A light-shielding layer is disposed between color filters of adjacent different blocks.

  According to the present invention, since the color filters of each color have a width corresponding to a predetermined number of pixels, the width of the light shielding layer disposed between adjacent different color filters is relatively small, and the liquid crystal display panel It becomes possible to improve the light transmittance.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the drawings referred to below are schematic, and the ratio of dimensions between the components of the liquid crystal display device, the number of color filters, the number of pixel electrodes, and the like are different from the actual ones. In the following embodiments, red, green, and blue are denoted as R, G, and B, respectively, as necessary.

  In the color filter unit 408 in the conventional liquid crystal display device shown in FIG. 5, the color filters of each color are arranged in the order of RGBRGB, but due to the parallax barrier 403, pixels are not arranged in that order on the right screen and the left screen. . Accordingly, the color filter unit 408 of FIG. 5 includes, in order from the left, a red filter for right screen 408r, a green filter for left screen 408g, a blue filter for right screen 408b, a red filter for left screen 408r, a green filter for right screen 408g, This is the blue filter 408b for the left screen. Therefore, even if the color filters are arranged in the order of RGBRGB, the pixels are not arranged in that order on the right screen and the left screen, so it is not necessary to arrange the color filters in this order.

  Therefore, instead of the color filter unit 408 shown in FIG. 5, as shown in FIG. 1, from the left, the red filter 80r for the right screen, the red filter 80r for the left screen, and the green filters 80g, 80g for the right and left as well. Similarly, when a striped color filter unit 80 in which blue filters 80b and 80b for right and left are arranged in the order of RRGGBB is used, both the right screen and the left screen are provided by the parallax barrier 3 having the same configuration as shown in FIG. In this case, the pixels are arranged in the order of RGB. In this case, the black matrix 80k may be provided between adjacent color filters of the same color, but the black matrix 80k between adjacent colors of the same color is unnecessary and unnecessary, so that portion can be eliminated.

  As shown in FIG. 2, the liquid crystal display device 100 according to this embodiment includes a black matrix 80k arranged between adjacent color filters 80r, 80g, and 80b for the same color in the color filter unit 80 shown in FIG. The color filter unit 8 having a configuration in which is eliminated is used.

  Hereinafter, the liquid crystal display device 100 according to the present embodiment will be described. As shown in FIG. 2, the liquid crystal display device 100 includes a liquid crystal display panel 1, a surface light source unit 2 that is superimposed on the back surface of the liquid crystal display panel 1 and irradiates the liquid crystal display panel 1, and a liquid crystal display panel 1. And a parallax barrier 3 that is spaced apart on the front side.

  The liquid crystal display panel 1 includes an array substrate 5, a counter substrate 6 that is disposed so as to face the array substrate 5 and sandwiches the liquid crystal layer 4 between the array substrate 5, and a surface of the counter substrate 6 on the liquid crystal layer 4 side. And a color filter unit 8 disposed in the. The side surface of the liquid crystal layer 4 is covered with a sealing material 7. The sealing material 7 prevents leakage of the liquid crystal layer 4 inside.

  The counter substrate 6 and the parallax barrier 3 of the liquid crystal display panel 1 are bonded by a transparent adhesive layer 10. The liquid crystal display panel 1 and the parallax barrier 3 are sandwiched between a polarizing plate 12 and a polarizing plate 13 disposed on the glass substrate 11.

  FIG. 3 shows a circuit configuration on the array substrate 5. In the array substrate 5, a plurality of pixel electrodes 23 for applying a voltage to the liquid crystal layer 4 are arranged in a matrix, and a switching element 24 such as a TFT (Thin Film Transistor) element for controlling the switching of the pixel electrode 23, and a switching element 24 are arranged. The scanning lines 311 to 314 and the data lines 301 to 306 to be driven are arranged so as to surround each pixel electrode 23. A pixel 40 is formed at each intersection of the scanning line and the data line.

  When the switching element 24 is a TFT element, the scanning lines 311 to 314 are connected to the gate electrode of the TFT element, and the data lines 301 to 306 are connected to the source electrode of the TFT element. A planar common electrode (not shown) is formed on the counter substrate 6 of FIG. The scanning lines 311 to 314 are driven by the scanning line driving circuit 22, and the data lines 301 to 306 are driven by the data line driving circuit 21. When the switching element 24 is turned on, the corresponding pixel electrode 23 is energized, and writing to the liquid crystal layer 4 of the corresponding pixel 40 is performed. On the other hand, when the switching element 24 is turned off, the written state is held.

  The color filter unit 8 shown in FIG. 2 is arranged corresponding to the arrangement of the pixel electrodes 23 on the array substrate 5, and the red filter 8r and the green filter 8g are arranged in the scanning line extending direction (hereinafter referred to as the x direction). The blue filter 8b is repeatedly arranged in a stripe shape.

  One block of a matrix-like array of pixel electrodes 23 (2 × n array: n is the number of pixel electrodes in the data line extending direction (y direction)) where the number of pixel electrodes (column number) in the x direction is 2. Then, the color filters for each color are arranged in units of blocks. Specifically, as shown in FIG. 3, the arrangement of the pixel electrodes 23 corresponding to the data lines 301 and 302 is a red block R, and the arrangement of the pixel electrodes 23 corresponding to the data lines 303 and 304 is a green block. G, if the arrangement of the pixel electrodes 23 corresponding to the data lines 305 and 306 is a block B for blue, the red filter 8r, the green filter 8g, and the blue filter 8b on the counter substrate 6 are respectively connected to the block R on the array substrate 5. , Block G and block B are arranged opposite to each other. Each color filter 8r, 8g, 8b has a width of two pixels in the x direction, and a black matrix 8k as a light shielding layer is arranged between the color filters of adjacent different blocks.

  The parallax barrier 3 is made of, for example, glass or a synthetic resin substrate, has a common slit-like optical opening 3a for each of the above-described blocks, and has a predetermined observation angle θ with respect to a certain direction α (a direction perpendicular to the slit surface). Corresponding to the above, a color filter is selected from the color filter unit 8 so as to be visible from two directions. The optical opening 3a has a width corresponding to one pixel in the x direction, and is disposed so as to correspond to the central portion of each color filter 8r, 8g, 8b having a width corresponding to two pixels, for example. A light shielding portion 3b is formed between the target openings 3a.

  As described above, according to the liquid crystal display device 100 according to the present embodiment, each color filter has a width corresponding to a predetermined number of pixels (two pixels) in the x direction, so that adjacent color filters of different colors are arranged. Therefore, the width of the black matrix 8k disposed in the space is relatively reduced, and the light transmittance of the liquid crystal display panel 1 can be improved.

  Since each color filter has a width of two pixels in the x direction, it is slightly more than the case where a black matrix 80k is provided between the color filters of the same color having a width of one pixel as shown in FIG. There is a possibility that the color bleed will appear. However, the data line 302 of the block R, the data line 304 of the block G, and the data line 306 of the block B shown in FIG. 3 serve as light shielding elements and function in the same manner as the black matrix 80k of FIG. be able to.

Note that the description in the present embodiment can be changed as appropriate without departing from the spirit of the present invention.
For example, FIG. 2 shows the case where the color filter unit 8 is arranged on the counter substrate 6, but as shown in FIG. 4, the color filter unit 8 is directly applied to the surface of the array substrate 5 on the liquid crystal layer 4 side. You may make it employ | adopt the structure of COA (Color filter On Array).
Further, the color filters of each color have been described as having a width corresponding to two pixels in the x direction. However, this width is not a width corresponding to two pixels but a width corresponding to two pixels (for example, two pixels). The width of the plurality of pixels may be set according to the number of different images to be displayed.

The figure which shows the cross-section of the liquid crystal display device in which the color filter was arranged in the extending direction of the scanning line in order of RRGGBB. The figure which shows the cross-section of the liquid crystal display device which concerns on embodiment of this invention. The circuit block diagram on an array board | substrate. The figure which shows the modification of the liquid crystal display device of this embodiment. The figure which shows the cross-section of the conventional liquid crystal display device of 2 screen displays.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2 Surface light source part 3 Parallax barrier 3a Optical opening part 3b Light-shielding part 4 Liquid crystal layer 5 Array substrate 6 Opposite substrate 7 Seal material 8 Color filter part 8r Red filter 8g Green filter 8b Blue filter 8k Black matrix 10 Adhesive layer 12, 13 Polarizing plate 21 Data line drive circuit 22 Scan line drive circuit 23 Pixel electrode 24 Switching element 40 Pixel 100 Liquid crystal display device 301, 302, 303, 304, 305, 306 Data line 311, 312, 313, 314 Scan line

Claims (3)

A liquid crystal display device that displays different images depending on parallax,
An array substrate in which a plurality of pixel electrodes are arranged in a matrix, and a switching element and a scanning line and a data line for driving the switching element are arranged so as to surround each pixel electrode, and are disposed to face the array substrate. A counter substrate having a common electrode and a liquid crystal layer sandwiched between the array substrate and the array substrate or the counter substrate; A plurality of color filters arranged by repeating different colors in the extending direction of the liquid crystal display panel,
A surface light source unit disposed on the back surface of the liquid crystal display panel and irradiating the liquid crystal display panel with light;
The liquid crystal display panel is disposed on the front side of the color filter and spaced apart from the color filter, and a common arrangement for each block with a matrix arrangement of pixel electrodes in which the number of pixel electrodes in the extending direction of the scanning lines is a predetermined number. A parallax barrier having an optical opening and selecting and viewing the color filter corresponding to a predetermined observation angle with respect to a certain direction,
The color filters for each color are arranged in units of blocks, have a width corresponding to the predetermined number of pixels in the scanning line extending direction, and a light shielding layer is arranged between the color filters of adjacent different blocks A liquid crystal display device.   The liquid crystal display device according to claim 1, wherein the number of pixels in the extending direction of the scanning lines in the same block is two.   3. The liquid crystal display device according to claim 1, wherein the data lines are arranged on the array substrate between pixel electrodes adjacent to each other in the extending direction of the scanning lines in the same block.

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