LCD Array Substrate Through-Hole Layout to Prevent Insulation Cracks
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Solution Overview
Problem
The existing TSS design for liquid crystal display panels faces a crack risk in the gate insulation layer due to undercut issues during the definition of deep and shallow holes, affecting the stability of the display panel.
Innovation Solution
The array substrate design includes a common electrode, a transparent shielding electrode, and a connecting electrode, where the connecting electrode is connected to the common electrode through a first through hole and to the transparent shielding electrode through a second through hole, with the holes spaced from each other to reduce the crack risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a deep hole and shallow hole are used to connect the common electrode and transparent shielding electrode, then electrical connection is achieved, but the gate insulation layer has crack risk due to undercut
Solution Approach 1:
The patent divides the connection structure into two separate through-holes (first through-hole and second through-hole) instead of using a single deep hole with undercut. Each through-hole is independently formed and spaced from the other, eliminating the undercut issue while maintaining electrical connection between the common electrode and transparent shielding electrode through the connecting electrode.
2Illumination intensity
If transparent shielding electrode is used to improve light transmittance, then light transmittance increases, but crack risk in gate insulation layer increases
Solution Approach 1:
The patent transitions from a vertical deep-hole structure to a horizontal spacing arrangement between two through-holes. By spacing the first through-hole and second through-hole apart and forming them in different element areas, the design eliminates the undercut problem in the vertical dimension while maintaining the transparent shielding electrode's light transmittance benefit.
Data Source
AI summary
An array substrate and a liquid crystal display panel are provided. The array substrate comprises a substrate; a first conductive layer arranged at a side of the substrate and comprising a common electrode; a second conductive layer arranged at a side of the first conductive layer away from the substrate and comprising a transparent shielding electrode; and a third conductive layer arranged at a side of the second conductive layer away from the substrate and comprising a connecting electrode; wherein, the connecting electrode is connected with the common electrode through a first through hole, the connecting electrode is connected with the transparent shielding electrode through a second through hole, and the first through hole is spaced from the second through hole.