Liquid Crystal Panel Substrate Alignment for Uniform Cell Gaps
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Solution Overview
Problem
Existing liquid crystal panels face issues with deformation due to stress from adhesive contraction, leading to non-uniform cell gaps and deteriorated display quality, especially when used in projection-type displays.
Innovation Solution
The liquid crystal panel design aligns the side surfaces of multiple substrates except for one side, applying adhesive only on these aligned surfaces to minimize stress-induced deformation and maintain consistent gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If adhesive is applied to bond the liquid crystal panel to the casing member, then heat dissipation and dust prevention are improved, but substrate deformation occurs due to adhesive contraction stress
Solution Approach 1:
The adhesive application is segmented into two distinct regions: a first adhesive layer applied at specific positions (corners or edge centers) for bonding, and a second adhesive layer applied as a continuous film on the side surfaces. This segmentation allows the bonding function to be separated from the heat dissipation function, reducing deformation while maintaining effectiveness.
Solution Approach 2:
Different adhesive application patterns are used in different regions of the liquid crystal panel. The first adhesive layer is applied locally at corners or edge centers where bonding strength is most needed, while the second adhesive layer is applied as a continuous film on side surfaces primarily for heat dissipation. This local differentiation optimizes both bonding and heat dissipation while minimizing deformation.
2Strength
If adhesive is applied to bond substrates to casing member, then bonding strength is improved, but cell gap uniformity deteriorates due to stress-induced deformation
Solution Approach 1:
The adhesive bonding is divided into two layers with different functions: the first adhesive layer provides localized bonding strength at corners or edge centers, while the second adhesive layer provides continuous bonding along side surfaces. This segmentation ensures adequate bonding strength while distributing stress to minimize cell gap non-uniformity.
Solution Approach 2:
Instead of applying adhesive uniformly across all surfaces, the first adhesive layer is applied partially at specific locations (corners or edge centers) where maximum bonding strength is required. This partial application reduces overall adhesive volume and associated contraction stress, thereby preserving cell gap uniformity while maintaining sufficient bonding strength.
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
This design suppresses substrate deformation, maintaining uniform cell gaps and improving display quality by preventing adhesive-induced stress on the substrates.
Implementation Method 1
stress is generated due to contraction of an adhesive for bonding a casing agent
Data Source
AI summary
A liquid crystal panel includes a counter substrate, a cover glass arranged at the counter substrate with an adhesive therebetween, an element substrate that is arranged at a surface of the counter substrate opposite to a surface at which the cover glass is arranged with a liquid crystal layer therebetween, and a casing member that is bonded to the counter substrate, the cover glass, and the element substrate via another adhesive. The another adhesive is provided on side surfaces of the counter substrate, the cover glass, and the element substrate except for one side of the element substrate. The counter substrate, the cover glass, and the element substrate are arranged in a state in which the side surfaces thereof are substantially aligned in plan view except for the one side.