Liquid Crystal Cell Layout for Stable Gap and Delamination Control
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Solution Overview
Problem
Existing liquid crystal cells face issues with maintaining cell gap and securing adhesion between substrates, leading to delamination and liquid crystal overflow during the bonding process, particularly due to the use of pressure-sensitive adhesive layers and spacers.
Innovation Solution
The liquid crystal cell design incorporates non-liquid regions to control the width of non-liquid crystal regions, utilizing a pressure-sensitive adhesive layer and spacers to maintain adhesion between substrates, ensuring the width of these regions is within specific ranges to prevent delamination and overflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a pressure-sensitive adhesive layer is formed on the upper substrate and spacers are formed on the lower substrate to maintain cell gap and adhesion, then the cell gap is maintained and attachment force is secured, but liquid crystal contamination occurs at the interface between the adhesive layer and spacers, causing delamination and reducing adhesive strength
Solution Approach 1:
The interface region between the pressure-sensitive adhesive layer and spacers is divided into liquid crystal regions and non-liquid crystal regions. The non-liquid crystal regions act as separate adhesive bonding zones that are free from liquid crystal contamination, ensuring reliable adhesion while the liquid crystal regions maintain the cell gap function.
Solution Approach 2:
Different regions of the interface are assigned different functions: non-liquid crystal regions are designated for adhesive bonding (with controlled width to ensure sufficient bonding area), while liquid crystal regions maintain the cell gap. This local differentiation allows each region to optimize its specific function without interfering with the other.
2Strength
If the width of non-liquid crystal regions is increased to prevent delamination and improve adhesion, then adhesive strength is improved, but the area available for liquid crystal function is reduced
Solution Approach 1:
The width of non-liquid crystal regions is optimized within a specific range (5-20 μm) to achieve the best balance between adhesive strength and liquid crystal region area. This parameter optimization ensures sufficient adhesive bonding area while maximizing the active liquid crystal display area.
3Strength
If adhesive is applied extensively to ensure strong bonding between substrates, then attachment force is improved, but liquid crystal contamination increases and adhesive control becomes difficult
Solution Approach 1:
The adhesive application area is segmented into non-liquid crystal regions with controlled dimensions. This segmentation allows precise control of adhesive quantity and placement, preventing overflow and contamination while ensuring sufficient bonding strength in the designated zones.
Solution Approach 2:
Non-liquid crystal regions are pre-defined and prepared before adhesive application. This preliminary action establishes precise boundaries for adhesive placement, ensuring that adhesive is applied only where needed and preventing contamination of liquid crystal regions during the bonding process.
4Length of stationary object
If spacers and alignment films are formed on the lower substrate with pressure-sensitive adhesive layer on the upper substrate, then cell gap maintenance is improved, but the complexity of the manufacturing process increases
Solution Approach 1:
The functions of cell gap maintenance and adhesive bonding are integrated into a unified structure where spacers define both the cell gap and the boundaries of non-liquid crystal regions. This merging eliminates the need for separate adhesive application steps and simplifies the manufacturing process while maintaining both cell gap precision and adhesive strength.
Data Source
AI summary
The present application relates to a liquid crystal cell and an optical device. The liquid crystal cell and optical device of the present application can properly maintain a cell gap of a liquid crystal element, have excellent adhesion between an upper substrate and a lower substrate, and solve the pressing and liquid crystal overflow problems capable of occurring during the bonding process of an outer substrate due to the delamination capable of occurring in the post-electrode process.