Counter Substrate Peripheral Barrier Wall for Display Panel Mura Prevention
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Solution Overview
Problem
In the manufacturing of liquid crystal display panels, solution accumulation during the alignment film formation process leads to uneven display brightness (Mura) and yellowing phenomena, affecting product optical quality.
Innovation Solution
A counter substrate design featuring a base substrate with a photo spacer pattern layer, including main and auxiliary pillar-shaped spacers, peripheral barrier walls, and a color filter layer, which maintains uniform cell thickness and supports the display panel under external pressure, preventing excessive alignment film accumulation and ensuring even cell thickness across the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the alignment film is formed using conventional methods, then the alignment film can be deposited on the substrate, but solution accumulation occurs leading to uneven display brightness and yellowing
Solution Approach 1:
The patent applies preliminary action by pre-forming protrusions on the counter substrate before depositing the alignment film. These protrusions serve as predetermined support points that prevent solution accumulation during the alignment film formation process. The protrusions are created through photo spacer patterning and etching processes that prepare the substrate surface in advance, ensuring uniform alignment film deposition without Mura or yellowing defects.
2Reliability
If the cell thickness is not uniformly controlled, then manufacturing is simpler, but uneven cell thickness causes Mura and yellowing phenomena
Solution Approach 1:
The patent applies local quality by creating non-uniform protrusions at specific locations rather than a uniform structure across the entire substrate. The protrusions are strategically positioned in the non-display area and have specific height and width characteristics that provide localized support. This local structural modification ensures uniform cell thickness in the display area while maintaining manufacturing feasibility, preventing Mura and yellowing phenomena.
3Manufacturing precision
If peripheral structures are added to the counter substrate, then cell thickness uniformity is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the counter substrate into functional regions: a display area and a non-display area with peripheral structures. The peripheral structures including protrusions and barrier walls are segmented and positioned specifically in the non-display area. This segmentation allows the main display area to remain simple while adding complexity only where needed for cell thickness control, achieving uniformity without excessive overall device complexity.
Data Source
AI summary
The present disclosure relates to a counter substrate and display panel. The counter substrate includes a base substrate, PS pattern layer and alignment film. A surface of the PS pattern layer away from the base substrate is a support surface, and the PS pattern layer includes: main PSs in a display area and a peripheral barrier wall in a non-display area. The peripheral barrier wall has an elongated-strip shape and has a same length direction as a corresponding display area side, the support surface of the peripheral barrier wall is closer to the base substrate than that of the main PS, and a distance between the support surfaces of the peripheral barrier wall and main PS in a thickness direction is a first distance.