Pixel Array Coupling Capacitance Reduces Color Washout
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Solution Overview
Problem
Conventional wide-viewing angle LCD panels, such as advanced-MVA and PSA LCD panels, suffer from color washout due to parasitic capacitances between pixel electrodes, which limit their display quality.
Innovation Solution
A pixel array design with a specific configuration of thin film transistors and pixel electrodes, where the first signal output terminal extends underneath the second pixel electrode to generate a coupling capacitance, increasing the voltage difference between the pixel electrodes and reducing parasitic capacitance effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional pixel array design is used in PSA LCD panels, then the device structure is simple, but parasitic capacitances between pixel electrodes cause color washout and poor display quality
Solution Approach 1:
The pixel electrode is divided into two separate electrodes (first pixel electrode and second pixel electrode), each controlled by independent thin film transistors. This segmentation allows different voltage signals to be applied to different regions, enabling compensation for color washout through differential voltage control while maintaining a relatively simple overall structure.
Solution Approach 2:
A coupling capacitor is introduced as an intermediary element between the first and second pixel electrodes. This capacitor mediates the voltage distribution between the two electrodes, creating a voltage difference that compensates for the parasitic capacitance effects causing color washout, thereby improving display quality without significantly increasing device complexity.
2Object-affected harmful factors
If voltage difference between pixel electrodes is increased to reduce color washout, then display quality improves, but parasitic capacitances limit the achievable voltage difference
Solution Approach 1:
The coupling capacitor serves as a mediator that amplifies and differentiates the voltage signals between the two pixel electrodes. By introducing this intermediary capacitive element, a larger effective voltage difference can be achieved across the liquid crystal layer than would be possible with direct electrode connection, overcoming the limiting effect of parasitic capacitances.
Solution Approach 2:
The invention changes the electrical parameters of the pixel structure by introducing capacitive coupling, which modifies the voltage distribution characteristics. This parameter change enables a wider voltage difference range between pixel electrodes, allowing for better compensation of color washout effects while maintaining signal integrity.
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 enhances the voltage difference between pixel electrodes, effectively reducing color washout and improving display quality by leveraging capacitive coupling effects.
Implementation Method 1
the first signal output terminal extends to the underneath of the second pixel electrode to generate a coupling capacitance with the second pixel electrode
Data Source
AI summary
A pixel array including a plurality of scan lines, data lines, and sub-pixels is provided. Each of the sub-pixels arranged in the nth row includes a first switch, a first pixel electrode, a second switch, a third switch, and a second pixel electrode. The first switch and the second switch are electrically connected to the nth scan line and the mth data line. The first switch and the first pixel electrode are electrically connected. The second switch has a first signal output terminal. The third switch is electrically connected to the (n+i)th scan line. The third switch has a signal input terminal electrically connected to the first signal output terminal and a second signal output terminal. The first signal output terminal is electrically insulated from the first pixel electrode and the second pixel electrode. The first signal output terminal extends to the underneath of the second pixel electrode.