LCD Array Substrate Insulating Layer Tilt-Down Profile
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Solution Overview
Problem
The existing design of array substrates in liquid crystal display (LCD) devices often results in electrode short-circuiting between adjacent pixels due to residual photoresist and reflective electrode layers, affecting the productivity and quality of LCDs.
Innovation Solution
The array substrate design incorporates an insulating layer with free ends that have a tilt-down profile with a decreasing width, preventing photoresist residue and ensuring complete removal during the development process, thus avoiding short-circuiting between pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulating layer has a standard flat profile, then the deposition process is simple, but photoresist residue remains causing electrode short-circuiting between adjacent pixels
Solution Approach 1:
The insulating layer is designed with an asymmetric profile where the free ends have a tilt-down configuration with decreasing width toward the broken region. This asymmetric geometry prevents photoresist residue accumulation by ensuring that deposited reflective electrode material does not bridge adjacent pixel areas, thereby eliminating short-circuiting while maintaining manufacturing feasibility.
Solution Approach 2:
The insulating layer profile is pre-configured with tilt-down free ends before the photoresist deposition and etching processes. This preliminary structural arrangement ensures that when photoresist is deposited and subsequently removed, no residue remains in the broken region, preventing electrode short-circuits without requiring additional cleaning steps.
2Manufacturing precision
If the photoresist is completely removed, then the reflective electrode layers can be properly patterned, but residual photoresist causes short-circuiting between pixels
Solution Approach 1:
The insulating layer is pre-formed with a specific tilt-down profile at its free ends before photoresist deposition. This preliminary structural preparation ensures that the photoresist cannot accumulate in the broken region, and when the photoresist is removed through standard development processes, no residue remains to cause short-circuiting, thereby ensuring both precise electrode patterning and reliable electrode isolation.
3Reliability
If the insulating layer covers the entire substrate, then complete insulation is provided, but photoresist residue accumulates in the broken region causing short-circuits
Solution Approach 1:
The insulating layer is segmented with broken regions where material is intentionally removed, creating gaps between adjacent pixel areas. The free ends of these segmented regions are configured with tilt-down profiles to prevent photoresist accumulation. This segmentation maintains substrate insulation while enabling complete photoresist removal and preventing electrode short-circuits.
Data Source
AI summary
An array substrate adopted for a liquid crystal display (LCD) device and the liquid crystal display device are provided. The array substrate includes a substrate, a plurality of scan lines, a plurality of data lines, a plurality of switching devices, and an insulating layer, wherein the insulating layer is deposited above the scan lines and the data lines, and has a plurality of free ends. A pair of the free ends faces each other and defines a broken region, and each free end has a tilt down profile with a decreasing width facing the broken region. The profile can avoid the short circuiting between the two adjacent array pixels, which is caused by the residual reflective electrode during the process.