Liquid Crystal Display Through-Hole Gas Release
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Solution Overview
Problem
The adhesion of the organic passivation film in liquid crystal display devices is compromised due to water absorption, leading to peeling issues, particularly with the second interlayer insulating film, which affects the precision and stability of the film structure and can result in light leakage or electrical connectivity problems.
Innovation Solution
A through hole is formed in the interlayer insulating film, specifically in the wide portion of the image signal line, allowing gas release without covering it with a conductive film, thereby preventing peeling and maintaining the structural integrity and functionality of the liquid crystal display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If an organic passivation film is used to flatten the base for the common electrode, then the surface flatness is improved, but the film absorbs water from the air causing peeling during heat treatment
Solution Approach 1:
The patent extracts the harmful water absorption function by introducing a through-hole in the organic passivation film. This allows absorbed water to be released from the film structure, preventing peeling while maintaining the flattening function. The through-hole acts as an extraction path for the harmful moisture without removing the passivation film itself.
Solution Approach 2:
The patent applies local quality by positioning the through-hole specifically in the wide portion of the image signal line area. This localized modification allows water release in the most critical area where peeling occurs, while leaving the rest of the passivation film intact and maintaining its flattening function across the entire surface.
2Reliability
If a through hole is formed in the interlayer insulating film to release gas, then peeling is prevented, but the conductive film may cover the through hole causing electrical connectivity issues
Solution Approach 1:
The patent positions the through-hole in the wide portion of the image signal line, which is specifically designed to be free of conductive film coverage. This local positioning ensures that the through-hole remains accessible for gas release while avoiding interference with electrical connectivity in other areas where conductive films are present.
Solution Approach 2:
The patent segments the image signal line area into different functional zones: the wide portion where the through-hole is formed for gas release, and other portions where conductive films are deposited for electrical connectivity. This segmentation allows both functions to coexist without interference.
3Reliability
If the through hole is covered by a transparent electrode for electrical connection, then conductivity is improved, but gas release from the organic passivation film is blocked
Solution Approach 1:
The patent extracts the gas release function by maintaining an open through-hole pathway that is not covered by conductive films. This allows harmful gases accumulated in the organic passivation film to escape to the surface, preventing pressure buildup and peeling while maintaining electrical connectivity through alternative paths.
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 configuration effectively prevents the peeling of the interlayer insulating film, improving production yield and maintaining image quality without reducing process latitude or causing disturbances in the electric field control of liquid crystal molecules.
Implementation Method 1
the organic passivation film is highly hygroscopic and absorbs water from the air when it is left outside
Implementation Method 2
a through hole is formed along the image signal line in the interlayer insulating film to allow gas present in the organic passivation film to be released from the through hole
Data Source
AI summary
In a liquid crystal display device that uses a TFT, a contact hole is formed to connect an image signal line. An organic film is formed so as to cover the image signal line, and a common electrode, which is a transparent electrode, is formed on the organic film. An interlayer insulating film is formed on the common electrode. A through hole is formed in the interlayer insulating film, and the diameter of the through hole is greater than the diameter of the contact hole.