Columnar Spacer Adhesive Fixing for Liquid Crystal Cell Gap Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal devices experience nonuniform cell gaps when substrates are placed vertically upright due to gravity, leading to decreased display quality.
Innovation Solution
A liquid crystal device configuration where a columnar spacer with a base portion on one substrate and a tip portion fixed to the other using an adhesive material is used, allowing the spacer to absorb tensile stresses and maintain a uniform cell gap, with recessed or protruded portions to secure the adhesive and prevent mixing with the liquid crystal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the liquid crystal device is placed vertically upright, then the liquid crystal layer pressure increases on the lower side, but the cell gap becomes nonuniform and display quality decreases
Solution Approach 1:
The columnar spacer is preliminarily formed on the first substrate before substrate bonding, with its base portion already positioned to receive tensile stresses. This preliminary structural preparation ensures that when gravity acts on the vertically placed device, the spacer is already in position to counteract gap expansion, maintaining cell gap uniformity from the outset
Solution Approach 2:
The columnar spacer acts as an intermediary element between the first and second substrates. It mediates the mechanical stress distribution by absorbing tensile stresses generated by gravity-induced liquid crystal pressure, thereby preventing direct gap expansion between substrates and maintaining uniform cell gap
2Strength
If the columnar spacer tip portion is fixed to the second substrate using adhesive material, then the spacer can receive tensile stresses, but the adhesive material may flow to the outside and mix with liquid crystal
Solution Approach 1:
The tip portion of the columnar spacer is given a localized recessed portion structure, creating a specific local geometry that differs from the rest of the spacer. This local structural modification allows the adhesive material to be contained within the recessed area, preventing outward flow while maintaining strong fixation strength between the spacer and second substrate
Solution Approach 2:
The recessed portion in the tip portion of the columnar spacer creates a nested structure where the adhesive material is contained within the recessed cavity. This nesting configuration physically restricts the adhesive material, preventing it from flowing outward and mixing with the liquid crystal while still allowing effective bonding
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
The configuration ensures a uniformly maintained cell gap even when substrates are upright, enhancing display quality by preventing gap expansion and securely fixing the spacer and adhesive.
Implementation Method 1
a tip portion fixed to the second substrate by using an adhesive material
Implementation Method 2
when the liquid crystal device is placed in a condition where the first substrate and the second substrate stand vertically upright, gravity acts on the liquid crystal layer between the first substrate and the second substrate. This increases the pressure of the liquid crystal layer on the lower side
Implementation Method 3
tensile stresses act on the columnar spacer. Therefore, the stresses to expand the gap between the first substrate and the second substrate are received as the tensile stresses by the columnar spacer
Data Source
AI summary
A liquid crystal device includes a first substrate, a second substrate, a columnar spacer and liquid crystal. The first substrate and the second substrate are bonded together with the columnar spacer interposed therebetween. The liquid crystal is sandwiched between the first substrate and the second substrate. The columnar spacer has a base portion formed on the first substrate, and a tip portion fixed to the second substrate by using an adhesive material.