Display Substrate Black Border Pattern Thickness Variation
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Solution Overview
Problem
Conventional LCD devices face defects due to loading effects, light leakage, and low flowability of liquid crystal molecules, primarily caused by the over-etching of black matrix patterns and the presence of dummy color filters, which lead to step differences and non-uniform cell gaps, degrading display quality.
Innovation Solution
The implementation of a display substrate with a black border pattern having alternating thicknesses and a gate metal pattern below the thinner border, eliminating the need for a dummy color filter, ensures uniformity and prevents over-etching, thereby enhancing liquid crystal flowability and reducing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a dummy color filter is disposed below the black border pattern to prevent light leakage, then light leakage is prevented, but step difference increases causing low flowability of liquid crystal molecules
Solution Approach 1:
The invention removes the dummy color filter from the structure, extracting the problematic element that caused step differences. Instead of using a dummy color filter to prevent light leakage, the patent uses a reflective layer combined with a specific black border pattern thickness variation to achieve the same light blocking function without compromising cell gap uniformity
Solution Approach 2:
The invention changes the thickness parameter of the black border pattern, making it thinner than conventional designs. By optimizing the black border pattern thickness to be less than 100 nm, the patent achieves both light leakage prevention and maintained cell gap uniformity, eliminating the need for dummy color filters
2Object-affected harmful factors
If the black border pattern thickness is increased to prevent light leakage, then light leakage is prevented, but over-etching of the black matrix pattern occurs due to loading effects
Solution Approach 1:
The invention applies different thicknesses of the black border pattern in different regions. The black border pattern has a first thickness in the display area and a second thickness (greater than the first) in the non-display area. This local differentiation allows the patent to prevent light leakage in the non-display area while maintaining proper etching control in the display area, avoiding over-etching of the black matrix pattern
3Manufacturing precision
If the black matrix pattern thickness is reduced to prevent over-etching, then over-etching is prevented, but light leakage increases
Solution Approach 1:
The invention merges multiple functions into a single integrated structure. The black border pattern serves dual purposes: it prevents light leakage and provides etching protection for the black matrix pattern. By combining these functions into one element with spatially varying thickness, the patent eliminates the need to compromise between preventing over-etching and preventing light leakage
Data Source
AI summary
A display substrate includes a base substrate having a display area and a non-display area surrounding the display area; a gate line disposed on the base substrate and extending in a first direction; a data line disposed on the base substrate and extending in a second direction; a thin film transistor connected to the gate line and the data line; a color filter disposed on the thin film transistor in the display area; a pixel electrode disposed on the color filter and connected to the thin film transistor; a black matrix pattern disposed to correspond to the gate line and the data line; a black border pattern disposed in the non-display area, and including a first border pattern having a first thickness and a second border pattern having a second thickness that is less than the first thickness; and a gate metal pattern disposed below the second border pattern.