Black Matrix Thickness Layout for Display Substrate Repair
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Solution Overview
Problem
The existing display substrates face issues with light leakage and non-uniform column spacer heights due to the removal of the black matrix in the channel area, leading to reduced liquid crystal margin and smear defects, as well as defects from residue in subsequent manufacturing processes.
Innovation Solution
A display substrate design featuring a black matrix with a first light-blocking portion covering gate and data lines and a second light-blocking portion covering the transistor channel, where the second light-blocking portion has a thinner thickness than the first, allowing for easier repair and reducing light leakage, and a color spacer is disposed on the second light-blocking portion to maintain uniform height and prevent defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the black matrix is removed in the channel area to simplify the repair process, then the repair process is simplified, but light leakage is generated through the channel area
Solution Approach 1:
The black matrix is designed with different thicknesses in different regions: a first thickness in the peripheral area and a second (thinner) thickness in the channel area. This local differentiation allows the channel area to be visible for repair while still providing sufficient light blocking to prevent light leakage, resolving the contradiction between ease of repair and light leakage prevention.
2Ease of repair
If the black matrix is removed in the channel area, then the repair process is simplified, but the height of the column spacer becomes non-uniform due to stepped difference
Solution Approach 1:
The black matrix employs local quality by having different thicknesses in different areas. The thinner second thickness in the channel area reduces the stepped difference compared to complete removal, while the first thickness in the peripheral area maintains sufficient light blocking. This localized thickness variation helps maintain column spacer height uniformity while still enabling repair access.
3Ease of repair
If the black matrix is removed in the channel area, then the repair process is simplified, but defects due to residue occur in subsequent manufacturing processes
Solution Approach 1:
By maintaining a thinner black matrix in the channel area rather than complete removal, the structure provides better support for subsequent manufacturing processes. The retained black matrix material prevents residue issues while still allowing channel visibility for repair, thus improving reliability without sacrificing ease of repair.
4Object-affected harmful factors
If a thick black matrix is formed to prevent light leakage, then light leakage is prevented, but the stepped difference between channel area and peripheral area increases
Solution Approach 1:
The black matrix is designed with local quality by having a first thickness in the peripheral area for sufficient light blocking and a second (thinner) thickness in the channel area. This local differentiation prevents excessive stepped difference while maintaining light leakage prevention, as each region has the thickness appropriate for its function.
Data Source
AI summary
A display substrate includes a transistor, a black matrix and a color spacer. The transistor is connected to a gate line, and a data line crossing the gate line. The black matrix includes a first light-blocking portion covering the gate line and the data line, and a second light-blocking portion covering a channel of the transistor. The second light-blocking portion has a thickness which is smaller than a thickness of the first light-blocking portion. The color spacer is disposed on the second light-blocking portion.