Liquid Crystal Display Columnar Spacer Positioning
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Solution Overview
Problem
In liquid crystal display devices with 2 pixel multi-domain type pixels, columnar spacers cause light leakage and contrast reduction due to alignment abnormalities during the rubbing process, particularly affecting the green sub pixel with high transmittance, and require optimal positioning to minimize these issues.
Innovation Solution
The columnar spacers are strategically disposed between sub pixels, with their orientation biased differently from the crossing points between scanning and video lines, ensuring they align with the rubbing direction to minimize scratches and light leakage, and their height is optimized to reduce light leakage levels, particularly in the green sub pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If columnar spacers are disposed between sub pixels to maintain gap space, then the gap space is steadily supported, but alignment abnormalities occur during rubbing process causing light leakage and contrast reduction
Solution Approach 1:
The patent applies local quality by differentiating the disposition of columnar spacers across different sub-pixel regions. Specifically, spacers are strategically positioned in certain sub-pixels (e.g., red and blue) while omitted from others (e.g., green), creating non-uniform local characteristics that prevent alignment abnormalities in high-transmittance regions while maintaining gap support where needed.
Solution Approach 2:
Instead of uniformly disposing columnar spacers across all sub-pixels as conventionally done, the patent inverts the approach by selectively omitting spacers from specific sub-pixels (particularly green sub-pixels with high transmittance). This inversion strategy counterintuitively solves the light leakage problem by removing the very elements that were intended to help.
2Manufacturing precision
If columnar spacers are uniformly disposed across all sub pixels, then gap space is consistently maintained, but alignment abnormalities occur in high transmittance sub pixels like green causing streak non-uniformity
Solution Approach 1:
The patent implements local quality by creating non-uniform spacer disposition patterns that adapt to local sub-pixel characteristics. Different sub-pixel types (red, green, blue) receive different spacer treatments based on their transmittance properties, allowing the structure to optimize both gap maintenance and display uniformity locally rather than applying a universal approach.
3Strength
If columnar spacers are disposed to support gap space under pressure, then pressure resistance is improved, but rubbing process creates scratches and alignment defects
Solution Approach 1:
The patent applies local quality by selectively positioning columnar spacers in sub-pixels based on their functional requirements. Spacers are disposed in sub-pixels that benefit from pressure resistance while omitting them from sub-pixels where they would cause rubbing-related scratches, creating locally optimized solutions throughout the display structure.
Data Source
AI summary
A liquid crystal display device having 2-pixel multi-domain type pixels, in which columnar spacers are disposed in optimal positions. Each of plural video lines has a first portion in which an acute-angled crossing angle of two crossing angles crossing each of scanning lines becomes a positive angle in a clockwise direction from each of the scanning lines, and a second portion in which an acute-angled crossing angle of the two crossing angles crossing each of scanning lines becomes a negative angle in the clockwise direction from each of the scanning lines. The first and second portions are alternately disposed so as to hold the scanning line between them.