Variable Width Black Matrix for LCD Crosstalk Prevention
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Solution Overview
Problem
Liquid crystal displays suffer from vertical crosstalk due to positional shifts between substrates, leading to light leakage and reduced aperture ratio, as conventional solutions widen the black matrix, compromising display performance.
Innovation Solution
A pixel structure with sub-pixel-unit-column pairs showing mirror symmetry, where data lines are arranged to prevent data lines between pairs, allowing a widened black matrix only where data lines are present and a narrowed black matrix where they are not, effectively preventing vertical crosstalk and increasing aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the black matrix is widened to prevent vertical crosstalk, then light leakage is reduced, but the aperture ratio is decreased
Solution Approach 1:
The black matrix is designed with variable width along the vertical direction: it is widened at the upper portion (first black matrix portion) where positional shift causes light leakage, and maintained at normal width at the lower portion (second black matrix portion) to preserve aperture ratio. This local differentiation allows targeted crosstalk prevention without overall aperture loss.
Solution Approach 2:
The black matrix is segmented into multiple portions with different widths: a first black matrix portion with greater width for shielding, and a second black matrix portion with normal width for aperture preservation. This segmentation enables the black matrix to fulfill both protective and area-efficient functions in different regions.
2Reliability
If the black matrix is widened to cover edges of the aperture area, then shielding effectiveness is improved, but the aperture area is reduced
Solution Approach 1:
The black matrix width is locally optimized: the first black matrix portion extends further to provide effective shielding at the critical upper region where positional shift occurs, while the second black matrix portion maintains minimal width to preserve aperture area in non-critical regions.
Solution Approach 2:
Instead of uniformly widening the entire black matrix, the invention applies excessive width (first black matrix portion) only to the specific region where shielding is most needed, and uses partial width (second black matrix portion) in other regions, achieving adequate protection with minimal area sacrifice.
Data Source
AI summary
The present invention provides a pixel structure and a liquid crystal panel having the pixel structure. The pixel structure includes a plurality of sub pixel units, a plurality of data lines respectively supplying data signals to the sub pixel units, and a black matrix (8) arranged to correspond to the data lines and the sub pixel units. The plurality of sub pixel units is arranged in multiple columns of which two adjacent columns of the sub pixel units are sequentially grouped and defined as a sub-pixel-unit-column pair (20). Each of the sub-pixel-unit-column pairs (20) shows mirror symmetry. The data lines are respectively arranged in the sub-pixel-unit-column pairs (20). The black matrix (8) includes first portions (82) located above the data lines, second portions (84) each located between two adjacent ones of the first portions (82), and third portions (86) respectively and perpendicularly connected to opposite ends of the first portions (82) and the second portions (84). The first portions (82) have a width that is greater than the width of the second portions (84).