Black Insulation Passivation Layer for Aperture Ratio
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Solution Overview
Problem
In thin film transistor liquid crystal display (TFT-LCD) panels, light leakage occurs due to misalignment of the array substrate and the opposite substrate, leading to a decrease in aperture ratio, which is exacerbated by the need to widen the black matrix to prevent leakage, thereby reducing color purity and contrast.
Innovation Solution
A passivation layer made of black insulation material is used on the array substrate, with an opening at the pixel display region, allowing it to function as both a passivation layer and a black matrix, eliminating the need for a separate black matrix on the opposite substrate and improving alignment during bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the black matrix is widened to prevent light leakage, then light leakage is reduced, but the aperture ratio decreases
Solution Approach 1:
The patent merges the passivation layer and black matrix into a single integrated structure. The passivation layer is formed using black insulation material that serves dual functions: providing electrical insulation and preventing light leakage. This eliminates the need for a separate black matrix layer, thereby maintaining aperture ratio while preventing light leakage between pixels.
Solution Approach 2:
The passivation layer is designed to perform multiple functions simultaneously: it acts as both the passivation layer for electrical insulation and the black matrix for light shielding. This multi-functional design reduces the number of separate components needed and prevents light leakage without compromising the aperture ratio.
2Manufacturing precision
If the black matrix is widened to prevent color mixture, then color purity is improved, but the aperture ratio decreases
Solution Approach 1:
By combining the passivation layer and black matrix functions into one layer, the patent achieves precise color isolation without requiring additional space for a separate black matrix. The black insulation material in the passivation layer provides sufficient light shielding to prevent color mixture between adjacent pixels while maintaining high aperture ratio.
3Object-affected harmful factors
If a separate black matrix is added on the opposite substrate, then light leakage is prevented, but device complexity increases
Solution Approach 1:
The patent extracts the black matrix function from the opposite substrate and integrates it into the passivation layer on the array substrate. This eliminates the need for fabricating a separate black matrix on the opposite substrate, simplifying the overall fabrication process while maintaining effective light leakage prevention.
Solution Approach 2:
The passivation layer and black matrix are merged into a single layer formed on the array substrate, reducing the total number of fabrication steps. The black insulation material is deposited and patterned as part of the passivation layer process, eliminating the need for separate black matrix fabrication on the opposite substrate.
4Object-affected harmful factors
If the black matrix is widened, then light leakage is reduced, but production cost increases
Solution Approach 1:
By merging the passivation layer and black matrix into one layer, the patent reduces material usage and fabrication steps. The black insulation material is formed as part of the passivation layer process, eliminating the need for separate black matrix materials and reducing overall production costs while maintaining effective light leakage prevention.
Data Source
AI summary
Embodiments of the disclosure provide an array substrate and a fabrication method thereof, and a display panel and a fabrication method thereof. A passivation layer of the array substrate is made of a black insulation material and the passivation layer is provided with an opening at a pixel display region of the array substrate. The passivation layer is simultaneously used as a black matrix, and thus the aperture ratio of the display panel is effectively increased.