LCD Panel Electrode Surface Treatment for Narrow Frame Alignment
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Solution Overview
Problem
In liquid crystal display (LCD) panel manufacturing, the high resistance of alignment layers prevents effective signal transmission through Au balls, leading to abnormal displays due to the need for wide frames to prevent alignment layer coverage of transfer pads, resulting in poor liquid crystal alignment and mura at the edges of the active area.
Innovation Solution
Surface treatment of electrode contact surfaces with lipophilic films or polishing to reduce adhesion of alignment liquid, allowing for uniform alignment layer thickness and extending the active area range without forming alignment layers on transfer pads, ensuring reliable Au ball contact and signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wide frame is left at the edge of the plate to prevent alignment layer coverage of the transfer pad, then reliable Au ball contact is ensured, but the active area range is reduced and the frame width is increased
Solution Approach 1:
The patent applies different properties to different regions of the electrode surface. The transfer pad region is treated to be hydrophobic (repelling alignment liquid) while other electrode regions remain hydrophilic (attracting alignment liquid). This local differentiation allows the alignment layer to form uniformly on most electrodes while automatically avoiding coverage of the transfer pad, enabling narrow frames without compromising Au ball contact reliability
Solution Approach 2:
The patent introduces a surface treatment layer (lipophilic film or polished surface) as an intermediary between the electrode and the alignment liquid. This intermediary layer acts as a barrier that prevents the alignment liquid from adhering to the transfer pad surface, thereby protecting the Au ball contact area from alignment layer coverage while allowing the alignment layer to form elsewhere
2Manufacturing precision
If the alignment layer is coated uniformly across the entire electrode surface, then complete coverage is achieved, but the Au ball signal transmission is blocked due to high resistance of the alignment layer
Solution Approach 1:
The patent creates spatially varying adhesion properties on the electrode surface through surface treatment. The transfer pad area is made hydrophobic to repel alignment liquid, while surrounding electrode areas maintain hydrophilic properties for proper alignment layer formation. This local differentiation ensures that the alignment layer forms uniformly where needed while automatically excluding the transfer pad region, preventing signal transmission blockage
3Area of stationary object
If the coating border of the alignment liquid is extended to within the sealant area, then the active area range is extended and frame width is narrowed, but nonuniform thickness at edges may occur
Solution Approach 1:
The patent applies surface treatment to specific regions (transfer pads) to create localized hydrophobic zones. This causes the alignment liquid to naturally retract from these treated areas during coating, forming a self-defined boundary. The alignment layer thickness remains uniform in the coated regions while automatically avoiding the transfer pad areas, enabling extended active area coverage without edge thickness nonuniformity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for narrower frames in LCD panels by ensuring uniform alignment and improved signal transmission, enhancing the display effect near the sealant area and reducing the inactive frame width, thus improving the overall display quality.
Implementation Method 1
the application of a lipophilic film on the contact surface
Implementation Method 2
the polishing treatment of the contact surface so as to diminish the adhesion of the alignment liquid to the transfer pad surface
Data Source
AI summary
The invention discloses a liquid crystal display (LCD) panel manufacturing method as well as an LCD panel and an LCD. The manufacturing method comprises the following steps: A: Treating a surface of an electrode of an LCD panel, the surface at least comprising a contact surface with an Au ball, to diminish the adhesion of an alignment liquid to the contact surface and prevent the alignment liquid from not coating the contact surface; and B: Coating or printing the alignment liquid. Because the electrode surface to which an Au ball particle will be applied (namely the transfer pad) is treated before the application to diminish the adhesion of the alignment liquid to this surface, and no alignment layer will be formed on the surface of the transfer pad. Therefore, the alignment layer can be very wide, the uniformity of the alignment layer at the edge is good, the accuracy is high, the display effect on the edge of the LCD panel is improved, and the frame of the LCD panel is narrowed.