Pixel Structure with Coupling Capacitance for Color Shift Reduction
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Solution Overview
Problem
Liquid crystal display panels experience a color shift phenomenon, where side-view images appear bluish at low gray levels, reddish or greenish at mid gray levels, and greenish or yellowish at high gray levels, leading to unnatural visuals.
Innovation Solution
A pixel structure is designed with an active device, a main pixel electrode, and sub-pixel electrodes, where the main pixel electrode is connected to the active device through a conductive line, and the sub-pixel electrodes are electrically insulated, forming coupling capacitances to maintain different voltages, thereby reducing color shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wide viewing angle techniques (MVA, MHA, IPS) are employed, then viewing angle is improved, but color shift phenomenon occurs at high gray levels
Solution Approach 1:
The pixel electrode is divided into two separate electrodes (first pixel electrode and second pixel electrode) that are electrically insulated from each other. This segmentation allows independent voltage control of each electrode, enabling precise manipulation of liquid crystal orientation to reduce color shift while maintaining wide viewing angle.
Solution Approach 2:
The invention changes the voltage parameters by applying different voltages to the first and second pixel electrodes independently. By controlling the voltage difference between these electrodes, the liquid crystal molecules can be oriented to minimize color shift at high gray levels while preserving wide viewing angle characteristics.
2Manufacturing precision
If pixel electrode is divided into multiple electrodes with different voltages, then color shift is reduced, but device complexity increases
Solution Approach 1:
The conductive line serves multiple functions: it provides electrical connection to the second pixel electrode and simultaneously forms a coupling capacitance with the first pixel electrode. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving color shift reduction.
Solution Approach 2:
The conductive line acts as an intermediary element that indirectly influences the first pixel electrode's voltage through capacitance coupling. This intermediary approach allows voltage control of both electrodes without requiring direct independent connections, simplifying the overall structure while enabling color accuracy improvement.
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
The solution effectively mitigates yellowishness or greenishness in side-view images at high gray levels, improving the visual appearance of liquid crystal display panels by minimizing color shift.
Implementation Method 1
the conductive line is coupled to the second pixel electrode to form a coupling capacitance
Data Source
AI summary
A pixel structure is provided. The pixel structure includes an active device, a first pixel electrode, a second pixel electrode, and a conductive line. The first pixel electrode is electrically connected to the active device. The second pixel electrode and the first pixel electrode are electrically insulated. The conductive line is located below the first pixel electrode and the second pixel electrode. The active device is electrically connected to the first pixel electrode through the conductive line. The conductive line is coupled to the second pixel electrode to form a coupling capacitance.