Sharing Capacitor Positioning for Movable Mura Elimination in LCDs
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Solution Overview
Problem
In vertical alignment liquid crystal displays, the movable mura phenomenon occurs due to shifts between the array substrate and the color filter substrate, leading to light leakage and a decrease in aperture ratio, which existing solutions attempt to address by widening the black matrix, thereby reducing the panel's transmission ratio.
Innovation Solution
The pixel units are arranged such that the gate line groups of adjacent units are close and sharing capacitors are positioned between the gate lines and pixel electrodes, ensuring light leakage regions are naturally apart from the pixel openings, allowing the black matrix to overlap without increasing its width, thus maintaining the aperture ratio and eliminating movable mura.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of the black matrix is increased to prevent light leakage and eliminate movable mura, then the movable mura is eliminated, but the aperture ratio decreases and transmission ratio is reduced
Solution Approach 1:
The patent extracts the light leakage prevention function from the black matrix and relocates it to the sharing capacitor. The sharing capacitor is positioned to overlap with the light leakage region, thereby preventing light leakage without requiring the black matrix to extend into the pixel opening. This separation of functions allows the black matrix to maintain its original dimensions while still preventing movable mura.
Solution Approach 2:
The sharing capacitor acts as an intermediary element that performs dual functions: charge sharing for color shift compensation and light leakage prevention. By positioning the sharing capacitor to overlap with the light leakage region, it serves as a mediator that blocks light leakage without requiring the black matrix to expand, thus preserving the aperture ratio.
2Object-affected harmful factors
If the black matrix is extended inward to cover light leakage regions, then light leakage is prevented, but the pixel opening area is reduced
Solution Approach 1:
The patent extracts the light leakage prevention function from the black matrix and assigns it to the sharing capacitor. The sharing capacitor is strategically positioned to overlap with the light leakage region, thereby performing the light leakage prevention function without requiring the black matrix to extend into the pixel opening, thus preserving the pixel opening area.
3Object-affected harmful factors
If the sharing capacitor width is increased to provide sufficient shielding, then light leakage prevention is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies multi-functionality to the sharing capacitor, which simultaneously performs charge sharing for color shift compensation and light leakage prevention. By positioning the sharing capacitor to overlap with the light leakage region, it serves dual purposes without requiring additional structures or increasing the black matrix width, thereby reducing device complexity and manufacturing difficulty.
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 light leakage and maintains the aperture ratio, reducing RC delay and enhancing pixel power rate by decreasing parasitic capacitance and the cost of extra wiring.
Implementation Method 1
due to the presence of the sharing capacitor 107 and its metallic shielding effect, the light leakage region 114 below the sharing gate line 102 is apart from the sub-opening 111
Data Source
AI summary
An array substrate is disclosed. A gate line group, common electrode line and two adjacent data lines together defining a pixel unit which has: a thin film transistor; a first and second pixel electrode disposed between the gate line group and the common electrode line; a sharing capacitor disposed between the gate line group and the pixel electrodes. The pixel units are arranged in a plurality of rows along the extending direction of data line, two adjacent pixel units are arranged sequentially in opposite direction. By using each of the sharing capacitors of the adjacent pixel units, the light leakage regions will be away from the openings of the pixel electrodes, therefore the movable mura can be eliminated without increasing the width of the black matrix and the aperture ratio loss can be solved.