COA Display Panel Via Boundary Compliance
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Solution Overview
Problem
In the conventional manufacturing process of COA panels, the liquidity of the color filter material causes the edge of the opening area to form a slope, shortening the distance between the via and the boundary, leading to non-compliance with design rules for pixel size, which affects the display effect.
Innovation Solution
A display panel design that includes a compensation portion near the edge of the opening area, such as a notch or blocking layer, to prevent the color resistor material from flowing into the opening, thereby increasing the distance between the via and the edge and ensuring the opening size complies with design rules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the color filter material is applied to form the opening area, then the color filter layer is formed, but the liquidity of the material causes the edge to form a slope that shortens the distance between the via and the boundary, making the opening area size non-compliant with design rules
Solution Approach 1:
The patent applies a compensation portion (such as a blocking layer or protrusion) on the color filter layer before forming the via. This compensation portion preemptively counteracts the harmful effect of material flow by occupying the space where excess material would otherwise flow, thereby preventing the slope formation and maintaining the required distance between the via and the opening boundary.
Solution Approach 2:
The compensation portion acts as an intermediary element between the color filter layer and the via. It mediates the interaction by providing a physical barrier that prevents direct contact and material flow between the liquid color filter material and the via region, thus maintaining dimensional compliance without affecting the overall structure.
2Manufacturing precision
If the opening area is reduced to maintain design rules, then the via distance to boundary is increased, but the color filter thickness requires a larger opening area for proper via formation
Solution Approach 1:
The patent segments the opening area into two functional zones: the actual via opening and the compensation portion. This segmentation allows the via opening to be smaller (maintaining proper distance to boundary) while the compensation portion provides the additional space needed for material flow and via formation, thus resolving the contradiction between size compliance and manufacturability.
Solution Approach 2:
The compensation portion extends in the vertical dimension (depth) of the color filter layer, allowing the horizontal opening area to be reduced. By utilizing the depth dimension, the via can be properly formed with adequate material flow space while maintaining compliant top-view dimensions for the opening area.
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a first base plate, a second base plate, and a liquid crystal layer. The first base plate includes a first substrate, an array structure layer, a color resistor layer on the array structure layer, and a pixel electrode layer on the color resistor layer. The color resistor layer includes at least three color resistor blocks, each of the color resistor blocks has a first opening. A first via is within the first opening.