Columnar Spacer Placement in LCD Sealing Regions
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Solution Overview
Problem
In liquid crystal display devices with inner and outer sealing materials, glass fibers or beads mixed into the sealing materials can cause electrical shorts at wiring intersecting portions due to their unpredictable positions, leading to device malfunction.
Innovation Solution
The solution involves strategically placing columnar spacers in the inner sealing material's forming region to avoid overlapping with wiring intersecting portions, with spacers of varying heights and diameters to prevent pressure-induced damage, and using glass fibers or beads in the outer sealing material with larger diameters to maintain structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If glass fibers or beads are mixed in the inner sealing material to function as spacers, then ease of operation is improved, but reliability deteriorates due to unpredictable positions causing electrical shorts at wiring intersecting portions
Solution Approach 1:
The patent divides the spacer function into two separate regions: the inner sealing material uses glass fibers or beads for ease of operation, while the outer sealing material uses columnar spacers with predetermined positions for reliability. This segmentation allows each material to optimize for its specific function without compromising the other.
Solution Approach 2:
The patent applies different spacer types to different regions of the sealing structure. The inner sealing material uses mixed glass fibers/beads for local ease of operation, while the outer sealing material uses positioned columnar spacers for local reliability. This local differentiation resolves the contradiction by allowing each region to have optimized properties.
2Manufacturing precision
If spacers are interposed in the forming region of the inner sealing material, then liquid crystal layer thickness uniformity is improved, but reliability deteriorates due to pressure on wiring intersecting portions
Solution Approach 1:
The patent segments the spacer placement by separating the inner and outer sealing materials, assigning different spacer types to each region. The outer sealing material's columnar spacers are specifically positioned to provide thickness uniformity without interfering with wiring intersecting portions in the inner sealing region.
Solution Approach 2:
The outer sealing material acts as an intermediary structure that provides the necessary mechanical support and thickness uniformity through its columnar spacers, while protecting the inner sealing material's wiring intersecting portions from direct pressure. This intermediary function allows the inner sealing material to maintain its simplified spacer configuration.
Data Source
AI summary
A liquid crystal display device includes: a pair of substrates disposed to face each other; an inner sealing material surrounding a non-display region between the pair of substrates; an outer sealing material surrounding the inner sealing material; liquid crystal filled between the inner sealing material and the outer sealing material; and a display region formed in a region where the liquid crystal is filled, and first columnar spacers fixed on any one of the pair of substrates are formed in the forming region of the inner sealing material, the first columnar spacers being formed so as to avoid positions overlapped with intersecting portions of the gate signal lines and the drain signal lines.