Liquid Crystal Display Color Filter Layout for Suppressed Color Mixing
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Solution Overview
Problem
Liquid crystal display devices face challenges in achieving higher fineness and wider viewing angles while preventing color mixing, especially when pixels are densely packed, as existing techniques struggle to effectively manage color mixing in oblique view fields.
Innovation Solution
The arrangement of color filters, where the second and fourth color filters are of the same type and have equal dimensions, with the first and third color filters having double the effective width of the second color filter, and the use of a specific layout of red, green, and blue color filters to prevent color mixing by not having red and blue filters adjacent to each other, along with a green filter in between, enhances display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pixels are arranged at high density to achieve higher fineness, then display fineness is improved, but color mixing between neighboring pixels increases
Solution Approach 1:
A black matrix layer is introduced as an intermediary between color filters of different colors (red, green, blue) to prevent direct optical interaction. This black matrix acts as a light-blocking barrier that stops color leakage between adjacent pixels, enabling high-density pixel arrangement without color mixing interference.
Solution Approach 2:
The black matrix is selectively positioned only between specific color filter combinations (red-green, green-blue, blue-red) rather than uniformly across all pixels. This localized application prevents color mixing at critical interfaces while maintaining overall display brightness and efficiency.
2Manufacturing precision
If the second and fourth color cells are made smaller to fit more pixels, then pixel density is improved, but luminance output decreases
Solution Approach 1:
The color filter arrangement transitions from a simple linear sequence to a multi-dimensional pattern where red, green, and blue filters are distributed across multiple rows and columns. This spatial redistribution allows smaller individual color cells to maintain adequate light collection area while achieving higher overall pixel density through optimized two-dimensional packing.
Solution Approach 2:
Multiple color filters (red, green, blue) are combined within each pixel unit to form a complete color display element. By merging different colored sub-pixels into functional pixel groups, the design achieves high density while maintaining sufficient luminance through the cumulative light output of multiple color components.
3Object-generated harmful factors
If the first and third color filters are made wider to prevent color mixing, then color separation is improved, but device complexity increases
Solution Approach 1:
The color filter widths are made asymmetric, with red and blue filters being wider than green filters. This asymmetric design optimally prevents color mixing at red-green and green-blue interfaces where it occurs most frequently, while avoiding the need for uniform width increases across all filters that would complicate manufacturing.
Solution Approach 2:
The black matrix serves as an intermediary barrier between color filters, eliminating the need for all filters to be uniformly wide for color separation. The black matrix handles the color isolation function, allowing color filters to maintain optimized, varied widths that reduce manufacturing complexity while still preventing color mixing effectively.
Data Source
AI summary
A liquid crystal display device includes a first substrate, a second substrate including an insulative substrate and a color filter layer formed on that side of the insulative substrate, which is opposed to the first substrate, the color filter layer including a first color filter of red, a third color filter of blue which is spaced apart from the first color filter, a fifth color filter of red which is spaced apart from the third color filter, a second color filter which is located between the first color filter and the third color filter and has a color which is different from red and blue, and a fourth color filter which is located between the third color filter and the fifth color filter and has a color which is different from red and blue, and a liquid crystal layer.