Retaining Wall Structure for Alignment Liquid Control in Display Panels
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Solution Overview
Problem
In TFT-LCD manufacturing, the polyimide (PI) coating process often results in overcoating, leading to reduced adhesive strength and production stability due to uncontrolled alignment liquid application, which affects the orientation of liquid crystal molecules and the assembly of substrates.
Innovation Solution
A retaining wall structure is introduced between the display area and the non-display area of the display panel, surrounded end-to-end to prevent alignment liquid overflow, using a metal layer with a protective layer to control the coating precision and prevent PI overcoating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If alignment liquid is applied without retaining wall structure, then coating process is simple, but coating precision deteriorates due to PI overcoating
Solution Approach 1:
The patent divides the coating area into display area and non-display area using a retaining wall structure, segmenting the alignment liquid application zone to prevent overcoating while maintaining process simplicity
Solution Approach 2:
The retaining wall structure acts as an intermediary barrier between the alignment liquid and the non-display area, controlling the liquid boundary without requiring complex coating equipment modifications
2Manufacturing precision
If retaining wall structure is added to block alignment liquid, then coating precision is improved, but device complexity increases
Solution Approach 1:
The retaining wall structure is implemented as a thin film or layer that can be integrated into the existing substrate structure, providing the blocking function without adding significant structural complexity or thickness
3Reliability
If PI coating boundary exceeds design value, then adhesive strength decreases, but production stability is affected
Solution Approach 1:
The retaining wall structure is pre-configured to prevent alignment liquid from exceeding the design boundary, thereby preemptively avoiding the reduction in adhesive strength and maintaining production stability
Data Source
AI summary
A display panel and a display device are disclosed. The display panel is divided into a display area and a non-display area. The non-display area is located at a periphery of the display area. A retaining wall structure configured to block an alignment liquid is disposed between the display area and the non-display area, and the retaining wall structure surrounds the display area and is connected end to end; the non-display area of the display panel includes a fan-out area, and the retaining wall structure includes a metal layer. The metal layer of the retaining wall structure and a metal layer of the fan-out area are formed as different layers.