Multi-Spacer LCD Structure for Injection Margin and Pressure Tolerance
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Solution Overview
Problem
The existing liquid crystal display (LCD) manufacturing process faces a trade-off between the margin of liquid crystal injection and tolerance to external pressure, leading to smear defects due to non-uniform cell gap maintenance.
Innovation Solution
A display apparatus with a multi-spacer structure, where spacers of varying heights are strategically placed to maintain uniform cell gaps and distribute external pressure effectively, enhancing the margin of the liquid crystal injection process while preventing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the volume of the cell gap spacer is decreased to enhance the liquid crystal injection margin, then the injection margin is improved, but the tolerance with respect to external pressure deteriorates causing smear defects
Solution Approach 1:
The single cell gap spacer is divided into multiple spacers with different heights (first, second, third, and fourth spacers). This segmentation allows each spacer to serve different functions: some maintain cell gap while others provide pressure distribution, resolving the contradiction between injection margin and pressure tolerance.
Solution Approach 2:
Different spacers are positioned at different locations with different heights to provide localized functions. The first spacer contacts the display substrate for pressure distribution, while other spacers maintain cell gap at specific regions, creating local quality variations that satisfy both injection and pressure requirements.
2Device complexity
If the cell gap is maintained by external pressure alone, then the structure is simple, but smear defects occur due to non-uniform pressure distribution
Solution Approach 1:
The pressure distribution function is segmented from the cell gap maintenance function by using multiple spacers with different heights. The first spacer specifically addresses pressure distribution while others maintain gap uniformity, improving manufacturing precision without excessive complexity.
Solution Approach 2:
The height parameter of spacers is varied to create different functional zones. By changing the height parameter from uniform to varied (first, second, third, fourth spacers with different heights), the system achieves both pressure distribution and gap uniformity.
Data Source
AI summary
A display apparatus includes a display substrate and a counter substrate. The display substrate includes a first substrate and a plurality of pixel electrodes formed on the first substrate. The counter substrate includes a second substrate facing the first substrate, a common electrode formed on the second substrate, a first spacer formed on the common electrode and making contact with the display substrate, a second spacer having a first gap with the display substrate, a third spacer having a second gap larger than the first gap with the display substrate, and a fourth spacer having a third gap larger than the second gap with the display substrate.