JP2008216357A - Liquid crystal display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve color reproducibility in a color liquid crystal display panel having display regions with various shapes. <P>SOLUTION: In the liquid crystal display panel which has a first substrate and a second substrate disposed opposite to each other via a liquid crystal layer, wherein a main pixel P which is composed of three sub-pixel regions SPA of R, G, B aligned in parallel in the lateral direction in accordance with respective pixels formed in the state of being aligned in rows and columns, and a black mask BM outside the region, to cover the outside of the display region, are formed on the first substrate, on the respective main pixels P which are not shielded from light with the black mask BM outside the region, the color filters of the respective R, G, B colors are aligned one by one with equal precedence on the respective sub-pixel regions SPA, and on the respective main pixels P which are partly shielded from light with the black mask BM outside the region, a black mask ABM for adjustment is formed on the respective sub-pixel regions SPA, and the color filters of the respective colors are aligned one by one with equal precedence on the respective sub-pixel regions SPA. <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 circular shape 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. 4 is formed on the liquid crystal display panel and color display is performed, as shown in FIG. 5, 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”) subpixels SP each composed of a color filter as a set. 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. 5) that the edge of the out-of-region black mask BM crosses, that is, the arcuate outline of the display region, the GRB sub-pixel SP constituting the main pixel P Since the arranged region (a part of the sub-pixel region SPA) is shielded by the arrangement of the out-of-region black mask BM, the formation area of each RGB color filter of the sub-pixel SP constituting the main pixel P is non-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 is formed with 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 composed of the first substrate and the second substrate. In a liquid crystal display panel in which one main pixel is composed of three RGB sub-pixel regions arranged in parallel in a direction and an out-of-region black mask covering the outside of the display region is formed, the out-of-region black mask In each main pixel that is not shielded from light, each color filter of RGB is arranged in the same order in each sub-pixel region, and each main pixel that is partially shielded from light by the out-of-region black mask. Pixel In each sub-pixel region, an adjustment black mask for equalizing the area where the color filter is arranged is formed, and each color filter is arranged in the same order in each sub-pixel region. There is in point.

  Specifically, the adjustment black mask may be formed so as to sandwich a color filter disposed in the sub-pixel region in the sub-pixel region arrangement direction of the main pixel, or adjacent sub-pixel regions. You may form between each color filter arrange | positioned.

  Further, the shape of the inner edge 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, when the main pixel in the inner peripheral portion of the display area shielded by the out-of-area black mask is energized, the three color filters of RGB constituting the main pixel are adjusted. Since the pixels are arranged so as to have the same area by the black mask, the color reproduction of the pixel can be performed with a desired color tone.

  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.

  Further, the adjustment black mask is formed so as to sandwich a color filter disposed in the sub-pixel region in the sub-pixel region arrangement direction of the main pixel, or each color disposed in the adjacent sub-pixel region By forming between the color filters, it is possible to provide color display up to the inner peripheral portion of the display area, and it is possible to achieve good display quality.

  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 an enlarged view of a color filter substrate for explaining the design of RGB color filters in the case of the present embodiment for the two pixels described with the solid lines in FIG.

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

  Further, in this embodiment, each main pixel P partially shielded by the out-of-region black mask BM is arranged in the same order with each color filter of RGB one by one in each sub-pixel region SPA. Has been.

  Specifically, the main pixel P indicated by the arrow B in FIG. 1 is shielded from light by the out-of-region black mask BM arranged so that a partial region surrounds a circular 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, an adjustment black mask ABM for equalizing the area where the color filter is arranged is formed in each of the sub-pixel areas SPA. Each color filter is arranged in the same order in each sub-pixel area SPA.

  In the liquid crystal display panel shown in FIG. 1, the adjustment black mask ABM is formed so as to sandwich a color filter disposed in the sub-pixel area SPA in the sub-pixel area arrangement direction of the main pixel P.

  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. In addition, a black mask BM is formed between the color filters in the sub-pixel area SPA arranged in the main pixel P, and is configured to prevent light leakage and the like.

  As described above, in the main pixel P having the same area in which the RGB color filters of each sub-pixel area SPA are arranged by the adjustment black mask ABM, when the main pixel is energized, a desired color tone is obtained. Color reproduction can be performed with.

  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.

  In particular, by forming the adjustment black mask ABM between the color filters arranged in the adjacent sub-pixel region SP, it is possible to provide color display up to the inner and outer peripheral portions of the display region, resulting in good display quality. It becomes possible.

  In addition, this invention is not limited to embodiment mentioned above, A various change is possible as needed. For example, as shown in FIG. 2, the adjustment black mask ABM is formed so as to divide a part of the color filter disposed in the sub-pixel region SP in the sub-pixel region arrangement direction of the main pixel P. Alternatively, as shown in FIG. 3, it may be formed at the boundary between the out-of-region black mask BM and the color filter. Further, the adjustment black mask ABM may be formed in one sub-pixel region of the two sub-pixel regions SPA constituting the main pixel according to the light shielding condition of the main pixel P of the out-of-region black mask BM. In some cases, it may be formed in all sub-pixel regions.

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

FIG. 5 is an enlarged view of a main part of two main pixels P indicated by solid lines in the TFT array substrate of the embodiment of the liquid crystal display panel according to the present invention. The principal part enlarged view of the two main pixels P shown as the continuous line in FIG. 5 in the TFT array substrate of another embodiment of the liquid crystal display panel which concerns on this invention FIG. 5 is an enlarged view of a main part of two main pixels P indicated by solid lines in a TFT array substrate of still another embodiment of the liquid crystal display panel according to the present 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. 4 is an enlarged view of the 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 outside the BM area Adjusted Black Mask
P Main pixel (Pixel)
SPA Sub Pixel Area
R red (color filter)
G Green (color filter)
B Blue (no color filter)

Claims (4)

A first substrate and a second substrate disposed opposite to each other via a liquid crystal layer;
The second substrate is formed of the first substrate and the second substrate, and a sub-pixel region in which RGB color filters are arranged is formed in correspondence with the pixel electrodes arranged vertically and horizontally. In a liquid crystal display panel in which one main pixel is composed of three sub-pixel regions of RGB arranged in parallel in a 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 black mask is formed in each sub-pixel region to equalize the area in which the color filter is arranged, and each color filter has one color filter in each sub-pixel region. A liquid crystal display panel characterized by being arranged in the same order. The liquid crystal display panel according to claim 1, wherein the adjustment black mask is formed so as to sandwich a color filter disposed in the sub-pixel region in the sub-pixel region arrangement direction of the main pixel. The liquid crystal display panel according to claim 1, wherein the adjustment black mask is formed between color filters arranged in adjacent subpixel regions. 4. 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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