Liquid Crystal Display Dummy Hole Color Filter Protection
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Solution Overview
Problem
The formation of contact holes in liquid crystal displays can damage the color filter, leading to changes in color coordinates and incomplete filling of the liquid crystal layer due to the discharge of color filter material.
Innovation Solution
A liquid crystal display design that includes a dummy hole exposing the color filter, covered by the pixel electrode, which prevents damage to the color filter and ensures complete filling of the liquid crystal layer by allowing gas emission and minimizing changes in color coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact holes are formed to connect pixel electrode and thin film transistor, then electrical connection is achieved, but color filter damage occurs leading to color coordinate changes
Solution Approach 1:
The patent divides the hole structure into two distinct types: contact holes for electrical connection and dummy holes for color filter stress relief. This segmentation allows each hole type to serve its specific function without interfering with the other, preventing color filter damage during contact hole formation while maintaining electrical connectivity.
Solution Approach 2:
The dummy holes act as intermediary elements that absorb mechanical stress and prevent it from transferring to the color filter during contact hole formation. These dummy holes serve as buffer zones that protect the color filter from damage while allowing the contact holes to be formed for electrical connection.
2Reliability
If contact holes are formed to connect pixel electrode and thin film transistor, then electrical connection is achieved, but liquid crystal filling fails due to color filter material discharge
Solution Approach 1:
The patent separates the functions of hole formation into contact holes for electrical connection and dummy holes for preventing liquid crystal filling failures. This segmentation ensures that the contact holes can be formed without causing color filter material discharge that would block liquid crystal filling.
Solution Approach 2:
The dummy holes serve as intermediary structures that prevent color filter material from discharging into the liquid crystal layer during contact hole formation. By providing alternative pathways or stress relief zones, the dummy holes protect the liquid crystal filling process from being blocked by discharged color filter material.
3Manufacturing precision
If dummy hole is added to cover exposing color filter, then color filter damage is prevented, but device structure becomes more complex
Solution Approach 1:
The dummy holes serve multiple functions simultaneously: they protect the color filter from damage during contact hole formation, prevent color filter material discharge that would block liquid crystal filling, and maintain color coordinate accuracy. This multi-functionality justifies the additional structural element by providing multiple benefits from a single feature.
Data Source
AI summary
A liquid crystal display according to an exemplary embodiment of the present invention includes a substrate, a gate line formed on the substrate, a data line intersecting the gate line and including a source electrode, a drain electrode facing the source electrode, a passivation layer formed on the data line and the drain electrode, a color filter formed on the passivation layer, a cover formed on the color filter and having a contact hole exposing the drain electrode, and a pixel electrode formed on the cover and connected to the drain electrode through the contact hole, wherein the cover includes a dummy hole exposing the color filter.