Liquid Crystal Display Cell Thick Area for Leakage Prevention
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Solution Overview
Problem
The One Drop Fill (ODF) method for manufacturing liquid crystal display devices faces issues with liquid crystal leakage into sealing members and air bubble generation due to insufficient liquid crystal distribution, particularly in corner portions, which increases manufacturing costs and reduces efficiency.
Innovation Solution
A liquid crystal display device design featuring a cell thick area with a larger cell gap between the display region and the sealing member, allowing the liquid crystal to spread more evenly and reducing contact time with the sealing member, thereby preventing leakage and air bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If liquid crystal is dropped onto the substrate and substrates are bonded together using the ODF method, then liquid crystal can be enclosed between substrates, but liquid crystal is inserted into the sealing member causing leakage
Solution Approach 1:
The sealing member is cured by ultraviolet rays or heat before the substrates are bonded together. This preliminary curing action ensures the sealing member is in a hard state during bonding, preventing liquid crystal from being inserted into the sealing member while still allowing proper liquid crystal distribution between substrates.
Solution Approach 2:
The sealing member is divided into different regions with different cell gap dimensions. The first cell gap region (near the sealing member) has a larger dimension than the second cell gap region (in the display area), which helps control liquid crystal flow and prevents insertion into the sealing member while maintaining proper distribution.
2Quantity of substance
If liquid crystal is dropped onto the substrate, then liquid crystal can be enclosed between substrates, but air bubbles are generated in corner portions due to insufficient liquid crystal
Solution Approach 1:
The cell gap is varied in the vertical dimension by creating different first and second cell gap dimensions. The larger first cell gap dimension near the sealing member allows liquid crystal to spread more easily to corner portions, ensuring sufficient liquid crystal distribution without generating air bubbles.
Solution Approach 2:
Different regions of the liquid crystal layer have different cell gap dimensions tailored to their specific needs. The first cell gap region has a larger dimension to facilitate liquid crystal flow to corners, while the second cell gap region maintains the standard display thickness for optimal display performance.
3Manufacturing precision
If columnar height measurement is performed to optimize liquid crystal dropping amount, then air bubbles and uneven display can be eliminated, but manufacturing cost increases and efficiency decreases
Solution Approach 1:
The structure itself (the cell gap variation and sealing member design) provides the liquid crystal distribution control function without requiring external measurement devices. The larger first cell gap dimension automatically facilitates liquid crystal flow to corner portions, eliminating the need for columnar height measurement while achieving precise liquid crystal distribution.
Solution Approach 2:
The complex measurement and control process (columnar height measurement and optimized dropping amount control) is removed from the manufacturing process. Instead, the desired liquid crystal distribution is achieved through the structural design of the cell gap variation, simplifying the manufacturing process while maintaining precision.
Data Source
AI summary
A liquid crystal display device includes: a pair of substrates that are bonded together with a sealing member having a closed loop shape that is formed around a display region with a space maintained from the display region; and a liquid crystal layer that is disposed between the pair of substrates so as to maintain a cell gap of a predetermined thickness, wherein, between the display region and the sealing member, a cell thick area, in which a cell gap larger than the cell gap of the display region is formed, is formed.