Asymmetric Black Matrix for LCD Color Shift Reduction
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Solution Overview
Problem
Conventional liquid crystal display apparatuses suffer from color shift issues at large viewing angles due to light leakage from adjacent pixel areas, affecting display quality.
Innovation Solution
A color filter with a black matrix layer having an upper portion and a lower portion of different widths is implemented between adjacent color filter units, effectively blocking light from adjacent pixel areas, thereby reducing color shift and enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional black matrix layer is used between color filter units, then the structure is simple and easy to manufacture, but light leakage occurs at large viewing angles causing color shift
Solution Approach 1:
The black matrix layer is designed with an asymmetric cross-sectional shape where the lower portion width is greater than the upper portion width. This asymmetric configuration creates an overlapping region that effectively blocks light from adjacent pixel areas at large viewing angles, thereby reducing color shift while maintaining manufacturing simplicity
Solution Approach 2:
The invention transitions from a conventional uniform-width black matrix to one with varying width along the vertical dimension. By making the lower portion wider than the upper portion, the solution addresses light leakage at oblique angles through a dimensional change in the black matrix structure, creating an overlapping region that blocks stray light without complicating the manufacturing process
2Object-affected harmful factors
If the black matrix layer has a larger lower portion width, then light blocking at large viewing angles is improved, but the device complexity increases
Solution Approach 1:
The black matrix layer employs an asymmetric cross-sectional design where the lower portion extends wider than the upper portion. This asymmetric structure creates an overlapping region between adjacent color filter units that effectively blocks light from adjacent pixels at large viewing angles, while the design remains relatively simple to manufacture
Solution Approach 2:
The black matrix layer has different widths at different vertical positions, with the lower portion being wider to specifically address light leakage at large viewing angles. This local variation in width provides targeted light blocking where needed while maintaining a relatively simple overall structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The unique design of the black matrix layer significantly reduces color shift at large viewing angles, improving the overall image display quality by blocking light from adjacent pixels, thus widening the viewing angle range without color shifting.
Implementation Method 1
the lower portion which protrudes outward with respect to the upper portion is able to block light coming from the other adjacent pixel areas under large viewing angles
Data Source
AI summary
A scan driving method for a display panel is disclosed. The color filter includes a plurality of color filter units and a black matrix layer. The color filter units are arranged in a matrix form, and the position of each color filter unit corresponds to that of a sub-pixel unit of a liquid crystal display apparatus. The black matrix layer is formed between the color filter units, and a cross section of the black matrix layer between two adjacent color filter units has an upper portion with a larger width and a lower portion with a smaller width.