Array Substrate Thinning for LCD Height Difference
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Solution Overview
Problem
In liquid crystal display (LCD) devices, the height difference between the pixel electrode region and the overlapped area of the common line and data line leads to Zara mura, causing inconsistent alignment and poor display quality due to the conventional design for high aperture ratio.
Innovation Solution
A manufacturing method for an array substrate involving the formation of metal wiring with an interlayer insulating film and a protecting layer, where specific zones of the interlayer insulating film and protecting layer are thinned to reduce the height difference between the common line and data line, ensuring parallel overlap and minimizing abnormal rubbing alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the common line and data line are disposed alternately to achieve high aperture ratio, then the active area occupation is reduced, but a height difference is generated between the pixel electrode region and the overlapped area of common line with data line, causing Zara mura
Solution Approach 1:
The patent applies local quality by making the interlayer insulating film have different thicknesses in different regions: a first thickness in the overlapped area of common line and data line, and a second thickness in the pixel electrode region. This local differentiation allows the film to be thinner where needed (overlapped area) to reduce height difference, while maintaining adequate thickness where required (pixel electrode region), thus resolving the contradiction between high aperture ratio and manufacturing precision
Solution Approach 2:
The patent changes the physical parameter of the interlayer insulating film thickness to resolve the contradiction. By controlling the film thickness to be a first thickness in the overlapped area and a second thickness in the pixel electrode region, the patent adjusts the height difference parameter to eliminate Zara mura while preserving the high aperture ratio design
2Area of moving object
If the common line and data line are disposed alternately to achieve high aperture ratio, then the active area occupation is reduced, but Zara mura occurs due to inconsistent alignment
Solution Approach 1:
The patent applies local quality by making the interlayer insulating film have different thicknesses in different regions: a first thickness in the overlapped area of common line and data line, and a second thickness in the pixel electrode region. This local differentiation allows the film to be thinner where needed (overlapped area) to reduce height difference, while maintaining adequate thickness where required (pixel electrode region), thus resolving the contradiction between high aperture ratio and manufacturing precision
Solution Approach 2:
The patent changes the physical parameter of the interlayer insulating film thickness to resolve the contradiction. By controlling the film thickness to be a first thickness in the overlapped area and a second thickness in the pixel electrode region, the patent adjusts the height difference parameter to eliminate Zara mura while preserving the high aperture ratio design
Data Source
AI summary
An array substrate, a manufacturing method thereof, a display panel and a display device are disclosed. The manufacturing method includes: forming a first metal wiring, an interlayer insulating film, a second metal wiring and a protecting layer in sequence on a substrate, the second metal wiring is parallel with the first metal wiring and has an overlapped area therewith which is defined as a first zone, and portions of the first and second metal wiring except the first zone are defined as a second zone and a third zone respectively; at least thinning a portion of the interlayer insulating film and/or the protecting layer corresponding to the first zone while leaving portions except those corresponding to the first, second and third zones un-thinned. The manufacturing method can mitigate Zara mura.