Liquid Crystal Display Spacer Segmentation for Cleaning
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Solution Overview
Problem
In liquid crystal display devices, spacers are prone to foreign object retention during cleaning, leading to alignment disorders and minute luminescent spots due to their extended dimensions, which complicates the cleaning process and affects cell thickness retention.
Innovation Solution
A liquid crystal display device configuration featuring spacers with alternating narrower and wider regions on the black matrix, where subspacers are placed in narrower regions and main spacers in wider areas, ensuring that spacers do not adjoin each other in the column direction, and having dimensions that allow for efficient cleaning without foreign object retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the spacer dimension in the extending direction is lengthened to secure retention strength of cell thickness, then the retention strength is improved, but foreign object retention during cleaning becomes more likely
Solution Approach 1:
The spacer arrangement is segmented into alternating first regions (with spacers) and second regions (without spacers) along the row direction. This segmentation creates a pattern where spacers are distributed at intervals rather than continuously, reducing the total extending dimension while maintaining retention strength through strategic placement. The black matrix is also segmented into corresponding first and second regions to accommodate this pattern.
2Reliability
If spacers are arranged continuously every three pixels or four pixels to maintain alignment, then alignment reliability is improved, but cleaning difficulty increases due to foreign object retention
Solution Approach 1:
The spacer arrangement exhibits local quality variation through the alternating pattern of first regions (with spacers for alignment control) and second regions (without spacers for cleaning facilitation). Each region has different properties: first regions provide alignment reliability while second regions provide cleaning ease. This local differentiation allows the system to achieve both objectives in different locations.
3Stability of the object's composition
If the spacer extends across subpixels of different colors, then cell thickness retention is secured, but alignment disorder occurs due to foreign object presence
Solution Approach 1:
The continuous spacer extension across subpixels is segmented into discrete spacer units positioned only in first regions. This segmentation prevents foreign objects from being trapped across color boundaries while maintaining cell thickness stability through adequate spacer distribution. The alternating pattern ensures that spacers provide sufficient support without creating continuous surfaces that trap contaminants.
Data Source
AI summary
A liquid crystal display device according to one aspect of the present invention includes: a liquid crystal layer sandwiched between an element substrate and an opposing substrate; a plurality of spacers; and a Hack matrix provided on a surface on the element substrate side of the opposing substrate and having a first portion that extends in a row direction to separate a plurality of subpixels arranged in a column direction and a second portion that extends in the column direction to separate a plurality of subpixels arranged in the row direction, are included. The first portion is formed by alternately disposing first regions and second regions having a narrower area than the first regions every two subpixels arranged in the row direction. The spacer is disposed in any of the first regions. The spacer in disposed in the first regions. Spacers arranged in odd-numbered rows and spacers arranged in even-numbered rows do not adjoin each other in the column direction.