JP2008216356A - Liquid crystal display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve color reproducibility in an inner peripheral section of display regions in a color liquid crystal display panel having display regions with various shapes. <P>SOLUTION: The liquid crystal display panel has a first substrate and a second substrate disposed via a liquid crystal layer. Sub-pixel regions SPA, on which R, G, B color filters are arranged in accordance with respective pixels, are formed on the second substrate. A main pixel P is composed of three sub-pixel regions SPA of R, G, B aligned in parallel in the lateral direction. On the respective main pixels P which are not shielded from light with a black mask BM outside the region, to cover the outside of the display region, the color filters of the respective R, G, B colors are aligned one by one and with equal precedence on the respective sub-pixel regions SPA. On the respective main pixels P which are partly shielded from light with the black mask BM outside the region, adjustment pixel regions APA which divide each of the sub-pixel regions SPA into three portions with equal areas are formed and aligned in parallel in the lateral direction. The color filters of the respective colors are aligned one by one and with equal precedence on the respective adjustment pixel regions APA. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid crystal display panel, and more particularly to a color display liquid crystal display panel in which a display area has a shape other than a rectangle (an irregular shape).

  In general, a display area of a liquid crystal display panel is manufactured as a rectangular quadrilateral, and the liquid crystal display panel is incorporated in various products as a display device. In recent years, liquid crystal displays applied to automobile speedometers and the like. In the case of a panel, a liquid crystal display panel (an irregular display area panel) in which a display area has an irregular shape such as a polygon, a semicircle, or a circle may be required (see Patent Document 1).

  Conventionally, as a kind of liquid crystal display panel, an active matrix type liquid crystal display panel using a TFT (Thin Film Transistor) as a nonlinear element for pixel switching has been proposed (see Patent Document 2).

  Here, the TFT type liquid crystal display panel will be briefly described. The TFT type liquid crystal display panel includes a TFT array substrate and a counter substrate which are arranged to face each other via liquid crystal. The TFT array substrate and the counter substrate are formed in a flat plate shape using a transparent resin such as transparent glass or polycarbonate.

  On the TFT array substrate, gate lines (scanning lines) and source lines (signal lines) are wired in a matrix. Near the intersection between the gate lines and the source lines, amorphous silicon for pixel switching is used. And a pixel electrode made of a transparent conductive film such as an ITO film.

  In addition, RGB color filters are formed on the counter substrate.

  Specifically, on the surface of the counter substrate, an inter-area black mask formed in a matrix surrounding the area facing each pixel electrode in the display area and an out-of-area black mask covering the non-display area are formed by photolithography or the like. It is formed by the method of. In the step of forming the black mask, RGB translucent colored resin is filled in the region facing each pixel electrode formed as a through-hole portion surrounded by the inter-filter black mask so as to fill the through-hole portion. Arranged in the same order, RGB color filters are formed. The color filters arranged in the region facing each pixel electrode act as sub-pixels (sub-pixels), and act as main pixels (pixels) by combining three adjacent RGB colors in parallel. That is, on the surface of the counter substrate, main pixels in which three sub-pixels each composed of RGB color filters are arranged in parallel in the horizontal direction are arranged vertically and horizontally.

  Note that a top coat layer, a transparent electrode (ITO electrode), and an alignment film for flattening unevenness due to the resin constituting the color filter are formed on the upper layer of the color filter, and this alignment film is formed on the counter substrate. The upper surface is disposed so as to face the TFT array substrate.

JP 2003-43449 A Japanese Patent Laid-Open No. 2003-400758

  By the way, when a circular display area as shown in FIG. 2 is formed on the liquid crystal display panel and color display is performed, as shown in FIG. 3, it is formed corresponding to each pixel electrode formed in a substantially rectangular shape. , Red (hereinafter referred to as “R”), green (hereinafter referred to as “G”), and blue (hereinafter referred to as “B”) main pixels P (in FIG. The out-of-region black mask BM is formed so that the arc-shaped outline constituting the irregularly shaped display region crosses (indicated by an arrow B). In that case, in the main pixel P (indicated by an arrow A in FIG. 3) that the edge of the out-of-region black mask BM crosses, that is, the arcuate outline of the display region, the RGB sub-pixels SP constituting the main pixel P are Since a part of the arranged region (sub-pixel region SPA) is shielded by the arrangement of the out-of-region black mask BM, the formation areas of the RGB color filters of the sub-pixel SP constituting the main pixel P are not uniform. Design.

  As described above, the main pixel including the sub-pixel region SPA shielded by the black mask BM formed in the inner peripheral portion of the display region where the outline of the irregularly shaped display region crosses the main pixel P, that is, the non-display region. In P, there is a concern that a desired color mixture may not be achieved, resulting in an unexpected color development and a display with poor color reproducibility.

  The present invention has been made in view of this point, and in a color display liquid crystal display panel having an irregularly shaped display area, it is intended to provide a liquid crystal display panel with good color reproducibility in the inner and outer peripheral portions of the display area. Objective.

  In order to achieve the above-mentioned object, the liquid crystal display panel according to claim 1 of the present invention is characterized in that it has a first substrate and a second substrate which are arranged to face each other with a liquid crystal layer interposed therebetween. The second substrate includes a sub-pixel region in which RGB color filters are arranged corresponding to the pixels arranged in the vertical and horizontal directions, each of which is configured by the first substrate and the second substrate. A liquid crystal display panel in which one main pixel is composed of three sub-pixel regions of RGB arranged in parallel in the horizontal direction, and an out-of-region black mask is formed to cover the outside of the display region. For each main pixel not shielded by the black mask, each color filter of RGB is arranged in the same order in each sub-pixel region, and a part of the color filter is shielded by the black mask outside the region. Each lord Basically, in each sub-pixel area, an adjustment pixel area that divides the sub-pixel area into three equal areas is formed in parallel in the horizontal direction, and each color filter is arranged in the same order in each adjustment pixel area. The points are arranged.

  In addition, an inter-filter black mask that shields light between the color filters arranged in the display area is formed.

  The shape of the inner edge portion of the out-of-region black mask is a polygonal shape, a semicircular shape, or a circular shape.

  According to the liquid crystal display panel of the present invention, in the main pixel in the inner peripheral portion of the display area shielded by the out-of-area black mask, when the sub-pixel area constituting the main pixel is lit, the adjustment pixel area Since the three color filters of RGB arranged so as to have the same area are turned on at the same time, a neutral color (white) can be obtained.

  Therefore, it is possible to prevent the appearance from being lost due to unexpected color development as in the prior art, and to improve the color reproducibility in the inner peripheral portion of the display area.

  The present invention will be described below with reference to the embodiment shown in FIG.

  The liquid crystal display panel of the present embodiment has a circular shape that is an irregular shape of the display region, and the out-of-region black mask BM is formed so as to cover a circular outer peripheral portion that becomes a non-display region. Yes.

  FIG. 1 is a partially enlarged view of a color filter substrate for explaining the design of an RGB color filter in the case of this embodiment for the two pixels shown by solid lines in FIG.

  In the present embodiment, for each main pixel P that is not shielded by the out-of-region black mask BM, RGB color filters are arranged in the same order in each sub-pixel region SPA.

  Specifically, the main pixel P indicated by an arrow A in FIG. 1 includes a sub-pixel area SPA in which an R color filter is disposed, a sub-pixel area SPA in which a G color filter is disposed, and a B color filter. The sub-pixel areas SPA in which are arranged are arranged in parallel in that order.

  In the present embodiment, each main pixel P area shielded from light by the out-of-area black mask BM includes an adjustment pixel area that divides the sub-pixel area SPA into three equal areas. Are formed in parallel in the horizontal direction, and each color filter of RGB is arranged in the same order in each adjustment pixel region.

  Specifically, the main pixel P indicated by an arrow B in FIG. 1 is partially shielded from light by the out-of-region black mask BM disposed so as to surround a circular display region. More specifically, the sub-pixel area SPA where the B color filter is originally arranged is shielded in the widest area, and the area remaining in the display area is the smallest. Conversely, the R color filter is originally arranged. A part of the provided sub-pixel area SPA is shielded from light in the smallest area, and the area remaining in the display area is the largest.

  Therefore, in the present embodiment, for these three sub-pixel areas SPA, adjustment pixel areas APA that divide the sub-pixel area SPA into three equal areas are formed in parallel in the horizontal direction. In the APA, RGB color filters are arranged one by one in the same order. In each subpixel area SPA, a pixel electrode of a TFT array substrate disposed with a liquid crystal layer interposed therebetween is disposed opposite to the subpixel region SPA. Further, it is desirable that a black mask BM be formed between the color filters of the sub-pixel area SPA and the adjustment pixel area APA arranged in the main pixel P. Light leakage and the like can be effectively prevented.

  As described above, in the main pixel P in which the RGB adjustment pixel area APA is formed in the sub-pixel area SPA, when the desired sub-pixel area SPA is energized, it is arranged so as to have the same area as the adjustment pixel area APA. Since the three RGB color filters are turned on at the same time, a neutral color (white) is obtained.

  Therefore, even if the display area is formed in an irregular shape, it is possible to prevent the appearance from being lost due to unexpected color development as in the past, and to improve the color reproducibility in the inner peripheral portion of the display area. It becomes possible.

  In addition, this invention is not limited to embodiment mentioned above, A various change is possible as needed. For example, the color filter RGB arrangement order is not limited to the permutation of this embodiment.

  In this embodiment, the TFT type liquid crystal display panel is exemplified, but the present invention may be applied to a passive matrix type liquid crystal display panel.

FIG. 3 is an enlarged view of a main part of two main pixels P in a portion indicated by a solid line in the TFT array substrate of the embodiment of the liquid crystal display panel according to the invention. The figure which shows an example of the display area of the unusual shape (circle shape) formed in the conventional liquid crystal display panel, and the part (arrowed part) in which the problem arises FIG. 2 is an enlarged view of a main part of the main pixel P indicated by an arrow in the TFT array substrate of the conventional liquid crystal display panel of FIG.

Explanation of symbols

BM Black mask P Main pixel (Pixel)
SPA Sub Pixel Area
APA Adjusted Pixel Area
R red (color filter)
G Green (color filter)
B Blue (no color filter)

Claims (3)

A first substrate and a second substrate disposed opposite to each other via a liquid crystal layer;
The second substrate is formed with the first substrate and the second substrate, and a sub-pixel region in which RGB color filters are arranged is formed corresponding to each pixel formed in a vertical and horizontal arrangement. In the liquid crystal display panel in which one main pixel is composed of three sub-pixel regions of RGB arranged in parallel in the horizontal direction and an out-of-region black mask covering the outside of the display region is formed,
For each main pixel not shielded by the out-of-region black mask, each color filter of RGB is arranged in the same order in each sub-pixel region, and a part of the color filter is arranged by the out-of-region black mask. In each main pixel that is shielded from light, an adjustment pixel region that divides the sub-pixel region into three equal areas is formed in parallel in each sub-pixel region, and each color filter is provided in each adjustment pixel region. A liquid crystal display panel, which is arranged one by one in the same order. The liquid crystal display panel according to claim 1, wherein an inter-filter black mask that shields light between the color filters arranged in the display area is formed. The liquid crystal display panel according to claim 1, wherein a shape of an inner edge portion of the out-of-region black mask is a polygonal shape, a semicircular shape, or a circular shape.

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