Pixel Electrode Segmentation for LCD Color Shift Reduction
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Solution Overview
Problem
Conventional multi-domain vertically alignment (MVA) LCDs suffer from color shift and coarseness in images displayed at large viewing angles due to pixel electrodes arranged in a lattice pattern, which affects display quality.
Innovation Solution
A pixel structure with a first and second pixel electrode, each connected to active devices and capacitance electrodes, forming capacitors with different capacitances, allowing for even distribution and staggered arrangement to reduce color shift and coarseness, with a driving method providing distinct voltages to these electrodes to adjust luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If pixel electrodes are arranged in a lattice pattern to reduce color shift, then color shift is reduced, but the displayed image appears coarse-grained
Solution Approach 1:
The pixel electrode is divided into multiple sub-electrodes (first sub-electrode and second sub-electrode) that are spatially separated. Each sub-electrode can be independently controlled to have different display voltages, allowing the pixel to function as multiple sub-display regions without requiring a lattice pattern arrangement, thus avoiding coarse-grained appearance while reducing color shift
Solution Approach 2:
Different regions of the pixel electrode are assigned different functions: the first sub-electrode and second sub-electrode are positioned to correspond to different capacitance electrodes with different voltage levels. This local differentiation allows medium to low gray level regions to have low luminance while high gray level regions maintain similar luminance, reducing color shift without compromising display quality
2Adaptability or versatility
If pixel electrodes are arranged in a lattice pattern to achieve wide viewing angle, then wide viewing angle is achieved, but the image appears coarse-grained
Solution Approach 1:
The pixel electrode is segmented into multiple sub-electrodes that can be independently controlled. This segmentation allows the pixel to function as multiple sub-display regions with different display voltages, achieving wide viewing angle capability without requiring the coarse lattice pattern arrangement, thus maintaining fine display quality
Solution Approach 2:
Instead of arranging pixels in a two-dimensional lattice pattern, the invention uses a one-dimensional segmentation approach within each pixel, dividing the pixel electrode into sub-electrodes along a specific direction. This dimensional change allows for finer control and better display quality while maintaining wide viewing angle characteristics
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 reduces color shift and coarseness in images displayed at large viewing angles, enhancing the display quality of LCDs by ensuring even luminance distribution without the coarse appearance associated with lattice patterns.
Implementation Method 1
The first capacitance electrode 114 and the second capacitance electrode 116 respectively have a specific voltage level. Thus, the first pixel electrode 120 and the second pixel electrode 130 have different display voltages due to the capacitance coupling effect thereof with respectively the first capacitance electrode 114 and the second capacitance electrode 116.
Data Source
AI summary
A pixel structure electrically connected to a data line and a scan line, and including a first and a second active device, a first and a second pixel electrode, and a first and a second capacitance electrode is provided. The first pixel electrode electrically connected to the first active device includes a first and a second electrode block electrically connected to each other. The second pixel electrode electrically connected to the second active device is electrically insulated from the first pixel electrode and separates the first and the second electrode block. The first pixel electrode respectively forms a first and a second capacitor with the first and the second capacitance electrode. The second pixel electrode respectively forms a third and a fourth capacitor with the first and the second capacitance electrode. The first and the second capacitor have different capacitances. The third and the fourth capacitor have different capacitances.