Array Substrate Pixel Electrode Breakage Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In traditional liquid crystal display technologies, the pixel electrode is prone to breaking due to lapping with the drain, resulting in poor performance and high local deformation.
Innovation Solution
An array substrate is designed with a first insulation layer located below the pixel electrode, extending along the edge of the lapping part and exposing a part of the drain, where the upper surface of the first insulation layer is lower than the drain's surface, reducing the local deformation and breakage risk by forming the pixel electrode on both the first and gate insulation layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pixel electrode is directly formed after the active layer, source and drain are formed, then the manufacturing process is simple, but the pixel electrode is liable to break due to large offset and thin pixel unit structure
Solution Approach 1:
An intermediate layer is introduced between the pixel electrode and the drain structure. This intermediate layer serves as a buffer that reduces the offset between the pixel electrode and drain, providing mechanical support to prevent pixel electrode breakage while maintaining the manufacturing simplicity of the direct formation process.
2Illumination intensity
If the thickness of the pixel electrode is reduced to ensure light transmission, then the light transmission performance is improved, but the pixel electrode becomes more fragile and liable to break
Solution Approach 1:
The pixel electrode is designed as a thin film structure to optimize light transmission. The intermediate layer provides additional structural support beneath the thin pixel electrode, compensating for the reduced strength caused by thinning while maintaining high light transmission performance.
3Reliability
If the thickness of the drain is increased to improve electrical connection, then the electrical performance is improved, but the offset between pixel electrode and drain increases causing deformation
Solution Approach 1:
The intermediate layer acts as a mediator between the thick drain structure and the thin pixel electrode. It reduces the offset caused by the thickness difference, preventing deformation of the pixel electrode while allowing the drain to maintain its increased thickness for improved electrical connection.
Data Source
AI summary
The invention discloses an array substrate, a manufacturing method thereof and a display device. The array substrate includes a gate, an active layer, a source and a drain on a substrate, and a pixel electrode located above the drain and lapped with the drain, and a part of the pixel electrode lapped with the drain is a lapping part of the pixel electrode; the array substrate further includes a first insulation layer located below the pixel electrode and in contact with the drain, the first insulation layer extends along the edge of the lapping part towards a direction away from the lapping part, part of the drain to be in contact with the lapping part is exposed from the first insulation layer, and the plane where the upper surface of the first insulation layer is located is lower than the plane where the upper surface of the drain is located.