Display Device Light Blocking Member Width Variation
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Solution Overview
Problem
Existing display devices, particularly liquid crystal displays, face issues with breakage of pixel electrode edges due to stress changes during manufacturing processes, which are not effectively addressed by current technologies.
Innovation Solution
The proposed display device incorporates a light blocking member with distinct width regions and a non-overlapping configuration with the pixel electrode, along with an organic insulation layer of specific thickness to absorb stress changes and prevent edge breakage. The light blocking member includes a first region wider than a second region, with a controlled distance between the second region and the pixel electrode edge, and an organic insulation layer thickness of about 2 μm to 3 μm to mitigate stress-induced cracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light blocking member is disposed close to the pixel electrode to improve light blocking efficiency, then light leakage is reduced, but stress concentration increases causing edge breakage of the pixel electrode
Solution Approach 1:
The light blocking member is designed with different width regions: a first region with greater width overlapping the gate line for enhanced light blocking, and a second region with narrower width near the pixel electrode to reduce stress concentration. This local variation in geometry resolves the contradiction between light blocking efficiency and structural reliability.
Solution Approach 2:
An organic insulation layer with thickness of 2-3 μm is introduced between the light blocking member and the pixel electrode. This layer acts as a cushioning element that absorbs stress changes during manufacturing processes, preventing stress transfer to the pixel electrode edge and avoiding breakage while maintaining the light blocking function.
2Reliability
If the insulation layer thickness is increased to prevent pixel electrode breakage, then stress absorption improves, but device structure complexity and manufacturing difficulty increase
Solution Approach 1:
The organic insulation layer thickness is optimized to a specific range of 2-3 μm. This parameter optimization provides sufficient stress absorption capability to prevent pixel electrode breakage while avoiding excessive thickness that would complicate the device structure and manufacturing process.
3Illumination intensity
If the light blocking member width is increased to improve light blocking performance, then light leakage is reduced, but stress on the pixel electrode increases causing edge breakage
Solution Approach 1:
The light blocking member features a non-uniform width profile with a first region of greater width for light blocking and a second region of narrower width near the pixel electrode. This local quality variation maintains effective light blocking while reducing stress concentration at critical areas.
Solution Approach 2:
The light blocking member exhibits asymmetric geometry with different width regions rather than a uniform cross-section. The narrower second region adjacent to the pixel electrode creates an asymmetric stress distribution that protects the electrode edge from breakage while the wider first region maintains light blocking efficiency.
Data Source
AI summary
A display device according to an exemplary embodiment of the present invention includes: a substrate; a gate line that is disposed on the substrate in a first direction; a data line that is disposed in a second direction, while crossing the gate line; a semiconductor layer that is disposed between the gate line and the data line, a transistor formed by the semiconductor, a part of the gate line, and a part of the data line; a pixel electrode connected with the transistor; and a light blocking member that is disposed on the pixel electrode, wherein the light blocking member is disposed in the second direction while overlapping the data line, the light blocking member includes a first region and a second region, each having a different width in the first direction, and a width of the second region is narrower than a width of the first region.