1. Field of the Invention
The present disclosure relates to a color filter substrate and more particularly to a color filter substrate and a liquid crystal display (LCD) having black matrixes with variable widths.
2. Discussion of the Related Art
The object of the claimed invention is to overcome the problem of dark mass or color shift resulting from the misplacement between the CF substrate and the TFT substrate of the curved LCD.
In one aspect, a color filter (CF) substrate having black matrixes with variable widths includes: the CF substrate is curved with black matrixes (BMs) arranged thereon, portions that are not covered by the BMs form subpixel display areas, wherein widths of the black matrixes increase gradually from a vertical-central axis of the CF substrate toward two sides of the CF substrate.
Wherein widths of the subpixel display areas decrease gradually from a vertical-central axis of the CF substrate toward two sides of the CF substrate.
Wherein a plurality of areas with a fixed width are defined on the CF substrate from the vertical-central axis toward two sides, the width of the black matrix of a central area where the vertical-central axis located and the width of the black matrix of an area closest to the vertical-central axis remain the same, the width of the black matrix of an adjacent area is greater than that of the central area by an amount equaling to “a”, and the width of the black matrix of one area is greater than that of the adjacent area closer to the central area by the amount equaling to “a.”
Wherein the subpixels includes R-subpixel, a G-subpixel, and a B-subpixel.
Wherein the subpixels includes R-subpixel, a G-subpixel, a B-subpixel, and a W-subpixel.
In another aspect, a liquid crystal device includes: a curved color filter (CF) substrate, portions that are not covered by the BMs form subpixel display areas, wherein widths of the black matrixes increase gradually from a vertical-central axis of the CF substrate toward two sides of the CF substrate, and widths of the subpixel display areas decrease gradually from a vertical-central axis of the CF substrate toward two sides of the CF substrate.
Wherein a plurality of areas with a fixed width are defined on the CF substrate from the vertical-central axis toward two sides, the width of the black matrix of a central area where the vertical-central axis located and the width of the black matrix of an area closest to the vertical-central axis remain the same, the width of the black matrix of an adjacent area is greater than that of the central area by an amount equaling to “a”, and the width of the black matrix of one area is greater than that of the adjacent area closer to the central area by the amount equaling to “a.”
Wherein the liquid crystal device further includes a backlight sheet arranged in a backside of a liquid crystal cell for applying optical compensation toward corresponding areas.
Wherein the liquid crystal device further includes a backlight sheet arranged in a backside of a liquid crystal cell for applying optical compensation toward corresponding areas.
Wherein the subpixels includes R-subpixel, a G-subpixel, and a B-subpixel.
Wherein the subpixels includes R-subpixel, a G-subpixel, a B-subpixel, and a W-subpixel.
In view of the above, the misplacement between the CF substrate and the TFT substrate of the curved LCD can be overcome. In addition, the problem resulting from increasing the width of the black matrix, such as the decreased aperture ratio and brightness, may also be solved. The uniform displaying performance is mainly achieved by optical compensation by the backlight sheet; also, the cost is relatively low.
Embodiments of the invention will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown.
When the CF substrate 10 and the TFT substrates 20 are bent at the same time, the subpixels at two sides of the CF substrate 10 and the openings on the TFT substrate 20 are misplaced, which is referred to as “shift.” The shift may result in dark mass or color shift. In order to overcome the above-mentioned problem, one feasible solution is to increase the width of the BM 11. When the shift occurs, the BM 11 with greater width may still block the opening caused due to the subpixel has spanned over areas on the TFT substrate. As such, the color mixture caused by two displayed colors on the same TFT opening area is avoided.
It can be understood that when the CF substrate 10 is bent, the shift amount increases from a vertical-central axis 12 toward two sides. The dimension of one single pixel unit, including subpixels and black matrixes, remains and the width of the black matrix increases gradually. Correspondingly, the width of the display areas of the subpixels decreases gradually. A plurality of areas with a fixed width are defined on the CF substrate 10 from the vertical-central axis 12 toward two sides. In an example, the width of the black matrix of the central area hl remains the same. The width of the black matrix of an adjacent area h2 is increased by an amount of “a.” Similarly, the areas are defined in sequence from the central area toward two sides as h3, . . . , hm, where n is a natural number. The width of the black matrix of one area is greater than that of the adjacent area closer to the central area by the amount equaling to “a.” That is, the width of the black matrix of the area hn is increased by an amount of “b.”
When the width of the BM 11 is increased but the gap between the pixels remain, the displaying area of the subpixels is decreased and the aperture ratio is also decreased, which result in lower brightness. This may be solved by performing optical compensated via a backlight sheet 30 arranged in a backside of the liquid crystal cell. The degree of the optical compensation may be adjusted by aperture ratio. When the width of the black matrix is 30 g m, the width of the subpixel is 180 g m, the width of one subpixel unit equals to a sum of the width of the black matrix and the subpixel. That is, in the example, 210 μm. The aperture ratio of the area hl may be 85.7%, which is approximately 180/210. The real aperture ratio may be lower as the shading of the “com” line located in the central pixel and the shield metal areas have to be considered. For the areas h2 and hn, if the width of the black matrix has to be increased for the amount 5 μm and 10 μm, the aperture ratio of the h2 and hn are respectively 83.3% (175/210) and 81% (170/210=). The aperture ratios of the areas h2 and hn are less than that of the normal area, i.e., 85.7%, for amounts equaling to 2.4% and 2.7%. This may be solved by adopting the backlight sheet to proportionally compensate the corresponding backlight areas of the areas h2 and hn. In this way, the color shift and dark mass issues of the curved LCD may be overcome while the uniform brightness of the backlight module is guaranteed.
In the second embodiment, as shown in
It is believed that the present embodiments and their advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments of the invention.
Filing Document | Filing Date | Country | Kind |
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PCT/CN2014/080541 | 6/23/2014 | WO | 00 |