Color Filter Transparent Electrode via Through Hole for Voltage Stability
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Solution Overview
Problem
The stability of the common voltage at the color filter's common electrode in liquid crystal display panels is poor, leading to unstable bias voltage for liquid crystal molecules, which affects display quality.
Innovation Solution
A manufacturing method for a color filter that involves sequentially depositing a metal layer and a black matrix layer on a substrate, patterning the black matrix layer using a half-tone mask to create a through hole, removing the metal and black matrix layers in specific areas, coating a RGB color filter layer, and depositing a transparent metal layer to connect the transparent electrode to the metal layer via the through hole, thereby stabilizing the bias voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the color filter common electrode is used for normal display, then the display function is achieved, but the common voltage stability deteriorates due to voltage influence from data lines and scan lines
Solution Approach 1:
The color filter common electrode is segmented into multiple independent electrode regions, each connected to the common voltage through separate pathways. This segmentation isolates the electrode from voltage fluctuations caused by data lines and scan lines, improving common voltage stability while maintaining the display function.
Solution Approach 2:
An intermediary structure is introduced between the color filter common electrode and the data lines/scan lines to prevent direct voltage influence. This intermediary layer acts as a buffer that blocks harmful voltage fluctuations while allowing the electrode to maintain its common voltage potential for proper display operation.
2Reliability
If the color filter common electrode is used, then the liquid crystal display panel can display images, but the bias voltage of liquid crystal molecules becomes unstable due to high resistance of the common electrode
Solution Approach 1:
Multiple electrode regions are merged into a unified common electrode system that shares a common voltage reference. By combining multiple low-resistance pathways into a parallel configuration, the overall resistance is reduced while maintaining adequate material quantity, thereby stabilizing the bias voltage for liquid crystal molecules.
Solution Approach 2:
The electrode structure transitions from a single-plane configuration to a multi-dimensional architecture with vertical connections and distributed pathways. This dimensional change creates additional conduction paths that reduce resistance without proportionally increasing material consumption, improving bias voltage stability.
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 method rapidly releases electric charges at the transparent electrode, stabilizing the bias voltage of liquid crystal molecules and improving the display quality of liquid crystal display panels by addressing the issue of unstable bias voltage.
Implementation Method 1
removing the metal layer in the color filter area by a wet etching method
Implementation Method 2
removing the black matrix layer in the through hole area by a dry etching method to form the black matrix and the through hole
Implementation Method 3
deposing a transparent metal layer on the substrate to form a transparent electrode
Data Source
AI summary
The present invention provides a manufacture method of the color filter, comprising: sequentially deposing a metal layer and a black matrix layer on a substrate; implementing a patterning process to the black matrix layer with a half tone mask; removing the metal layer in the color filter area and the black matrix layer in the through hole area; coating a RGB color filter layer in the color filter area; deposing a transparent metal layer on the substrate to form a transparent electrode. The present invention improves the display quality of the liquid crystal display panels.