Display Substrate Protection Metal Layer for Shielding and Aperture Ratio
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Solution Overview
Problem
Existing TFT LCDs face issues with aperture ratio reduction due to a large black matrix width, leading to decreased brightness and image quality, and struggle with material adhesion and residue formation during the lithography process for forming the black matrix pattern.
Innovation Solution
A display substrate with a protection metal layer covering non-display regions, made of low-reflectivity materials like MoNbO, MoNbON, MoTiO, or MoSi, which replaces the black matrix, ensuring structural stability and high resolution, and is fabricated using a lithography process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wide black matrix is used to shield thin-film transistors and signal lines with arrangement deviation, then shielding effect is improved, but aperture ratio is reduced
Solution Approach 1:
The invention divides the substrate structure into two separate substrates: a first substrate containing thin-film transistors and signal lines, and a second substrate containing color filters and black matrix. This segmentation allows each substrate to be optimized independently, enabling the black matrix to provide adequate shielding without compromising the aperture ratio of the display area on the first substrate.
Solution Approach 2:
The invention transitions from a single-substrate approach to a dual-substrate arrangement, adding the dimension of substrate separation. By stacking the first substrate and second substrate opposite to each other with the liquid crystal layer in between, the shielding function is achieved in the vertical dimension while maintaining the horizontal aperture ratio.
2Area of stationary object
If thin-film transistors, color filters and black matrix are integrated on one substrate using COA technique, then aperture ratio is increased, but manufacturing precision deteriorates due to lithography process issues
Solution Approach 1:
The invention segments the display structure into separate first and second substrates, allowing the black matrix to be formed on the second substrate where lithography processes can be optimized independently. This avoids the manufacturing precision issues that arise when attempting to form black matrix patterns on the first substrate in COA technology, while still achieving high aperture ratio through the integrated design.
Solution Approach 2:
The invention introduces the second substrate as an intermediary layer that carries the black matrix and color filters. This intermediary substrate acts as a carrier that resolves the conflict between aperture ratio and manufacturing precision by providing a dedicated platform for forming these patterns with appropriate lithography processes.
3Reliability
If black matrix material is used on first insulation layer, then shielding function is achieved, but adhesion capability is insufficient resulting in unstable structure
Solution Approach 1:
The invention uses the second substrate as an intermediary carrier for the black matrix material. This allows the black matrix to be deposited on a substrate surface that provides appropriate adhesion properties, rather than attempting to deposit it directly on the first insulation layer where adhesion is insufficient. The second substrate serves as a stable foundation that ensures both shielding function and structural stability.
Solution Approach 2:
The invention changes the substrate parameter by introducing a separate second substrate with different material properties optimized for holding the black matrix and color filters. This parameter change enables better adhesion and structural stability while maintaining the required shielding function.
Data Source
AI summary
The present invention relates to a display substrate and a method for fabricating the same, a display panel and a display device. The display substrate comprises a plurality of pixels, each of which has a display region, a non-display region being between the plurality of pixels, and the display substrate further comprises a protection metal layer covering the non-display region. In the display substrate, the protection metal layer covers the non-display region of the display substrate so as to shield the structures of the thin-film transistors, signal lines and the like on the display substrate, and thus the stability of structure of the display panel as well as the high resolution of the display panel and excellent display effect thereof can be ensured, and, in the meantime, the procedure of fabrication process is simplified, the manufacture efficiency is improved, and the cost for manufacturing is reduced.