Dual Protection Layer for Display Peripheral Circuit Scratch Resistance
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Solution Overview
Problem
Conventional LCD display panels face reduced yield rates due to scratches in the protection layer covering the intersections of metal wirings, leading to abnormal image signals, as the protection layer is not comprehensive enough to prevent damage during fabrication and testing.
Innovation Solution
A display panel design featuring a first protection layer on both the display and peripheral areas, with a second protection layer composed of color filter, black matrix, or photo spacer material layers, which covers the peripheral circuit and its intersections, ensuring comprehensive protection without covering the pads that need to be electrically connected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single protection layer is used to cover the peripheral circuit area, then the structure is simple and manufacturing is easy, but the protection layer is easily scratched during fabrication and testing, leading to reduced yield rate
Solution Approach 1:
The protection layer is divided into two distinct layers: a first protection layer covering the display area and peripheral area, and a second protection layer specifically covering the peripheral circuit area. This segmentation allows each layer to be optimized for its specific function, with the second layer providing enhanced protection for the vulnerable peripheral circuits without compromising the overall structure.
Solution Approach 2:
The second protection layer is formed by stacking material layers (color filter material layer, black matrix material layer, and photo spacer material layer) vertically on the first protection layer within the peripheral area. This creates a multi-layered vertical structure that provides enhanced protection through multiple interfaces and material barriers, effectively preventing scratches that would penetrate a single-layer structure.
2Reliability
If the protection layer covers all areas including display and peripheral areas, then comprehensive protection is achieved, but the pads cannot be accessed for electrical connection
Solution Approach 1:
The second protection layer is selectively formed only within the peripheral area where peripheral circuits are located, while deliberately excluding the pad regions. This local application of enhanced protection ensures that the vulnerable peripheral circuits are protected while maintaining pad accessibility for electrical connections and testing operations.
3Reliability
If the protection layer is made thicker to prevent scratches, then protection performance improves, but the fabrication and testing processes become more complex
Solution Approach 1:
The color filter material layer, black matrix material layer, and photo spacer material layer are designed to serve dual purposes: they provide enhanced protection for the peripheral circuit area while simultaneously performing their traditional display functions. This multi-functionality allows the protection structure to be integrated into the existing display panel fabrication process without requiring entirely new manufacturing steps.
Data Source
AI summary
A display panel includes a first substrate, a pixel array, a peripheral circuit, a first protection layer, a second protection layer, a display medium, and a second substrate. The first substrate array has a display area and a peripheral area, wherein the pixel array is disposed in the display area, the peripheral circuit is disposed in the peripheral area, and the pixel array and the peripheral circuit are electrically connected. The first protection layer is disposed on the display area and the peripheral area to cover the pixel array and the peripheral circuit. The second protection layer is at least disposed on the first protection layer within the peripheral area. Here, the second protection layer includes a color filter material layer, a black matrix material layer, a photo spacer material layer, or a combination thereof. The second substrate is disposed above the first substrate to expose the peripheral area.