COA Array Substrate Vent Holes for Bubble Prevention
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Solution Overview
Problem
In COA technology, residual gases in the color filter layer can penetrate into the liquid crystal layer, forming bubbles due to high temperatures, high pressures, or external shocks, which affect display quality and reduce product yield.
Innovation Solution
A COA array substrate with a color filter layer having vent holes in the non-display region, allowing gas discharge during layer formation and preventing gas penetration into the liquid crystal layer, featuring circular or square vent holes with diameters or side lengths of 3-6 μm, which are evenly spaced to facilitate gas release without affecting display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the color filter layer is formed directly on the array substrate using COA technology, then the aperture ratio is improved and light leakage is reduced, but residual gas in the color filter layer penetrates into the liquid crystal layer forming bubbles
Solution Approach 1:
The color filter layer is designed with a porous structure containing multiple vent holes that allow residual gas to escape during the sealing process. This porous design prevents gas accumulation and penetration into the liquid crystal layer, thereby eliminating bubble formation while maintaining the high aperture ratio achieved through COA technology
Solution Approach 2:
The vent holes act as intermediary channels that provide a controlled pathway for gas evacuation. By introducing these intermediate structures within the color filter layer, the patent creates a safe escape route for residual gas, preventing it from reaching the liquid crystal layer and forming bubbles
2Reliability
If vent holes are added to the color filter layer to release gas, then bubble formation is prevented, but the manufacturing process complexity increases
Solution Approach 1:
The vent holes are pre-formed within the color filter layer during the coating process, before the sealing and filling operations. This preliminary action ensures that gas escape pathways are already in place, simplifying subsequent manufacturing steps and avoiding the need for additional complex processing to create gas venting structures
Solution Approach 2:
The formation of vent holes is integrated into the existing color filter layer manufacturing process, combining multiple functions (color filtering and gas venting) into a single structural element. This merging approach eliminates the need for separate gas venting components and reduces overall process complexity
Data Source
AI summary
This disclosure discloses a COA array substrate, including a base substrate, and an array of pixel structures disposed on the base substrate, wherein the pixel structure is provided with a color filter layer, the color filter layer includes a first portion and a second portion, the first portion of the color filter layer covers a display region of the pixel structure correspondingly, the second portion of the color filter layer covers a non-display region of the pixel structure correspondingly; in the second portion of the color filter layer is provided with vent holes. This disclosure also discloses a liquid crystal display panel, including an array substrate and a cell aligning substrate disposed oppositely, the liquid crystal molecules are disposed between the array substrate and the cell aligning substrate, wherein the array substrate described above uses the COA array substrate.