Liquid Crystal Display Sub-Pixel Voltage Coupling
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Solution Overview
Problem
Conventional liquid crystal displays experience color deviation issues due to variations in viewing angles, as each pixel uses only a single driving voltage, leading to differences in light transmissivity at different viewing angles.
Innovation Solution
The implementation of a liquid crystal display with two sub-pixels per pixel, each having a distinct driving voltage, where the voltage coupling device ensures that the optical effects of the two sub-pixels compensate for each other, thereby eliminating color deviation by adjusting the voltages of the pixel electrodes to maintain a specific relationship between their variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single driving voltage is used for each pixel, then the device complexity is reduced, but color deviation occurs as viewing angle varies
Solution Approach 1:
Each pixel is divided into two sub-pixels (first sub-pixel and second sub-pixel) with different liquid-crystal tilt angles. This segmentation allows each sub-pixel to have optimized optical characteristics for different viewing angles, and their combined output compensates for color deviation across the entire pixel area.
Solution Approach 2:
The two sub-pixels within each pixel are assigned different liquid-crystal tilt angles, creating local quality differences. This enables each sub-pixel to optimize its light transmissivity for specific viewing angle ranges, and the combination achieves uniform color output across all viewing angles.
2Ease of manufacture
If two sub-pixels with different liquid-crystal tilt angles are used per pixel, then color deviation is eliminated, but device complexity increases
Solution Approach 1:
The optical effects of the two sub-pixels with different tilt angles are merged/combined to achieve color compensation. By integrating their light transmissivity characteristics, the system eliminates color deviation while maintaining a manageable overall pixel structure.
Solution Approach 2:
Each pixel structure is designed to perform multiple functions: the first sub-pixel optimizes for one viewing angle range while the second sub-pixel optimizes for another range. This multi-functionality allows a single pixel to maintain color consistency across all viewing angles without requiring different pixel designs.
3Illumination intensity
If two driving voltages are applied to each pixel, then light transmissivity consistency is improved, but the control system becomes more complex
Solution Approach 1:
A voltage coupling device is introduced to create electrical correlation between the first and second common electrodes. This feedback mechanism ensures that voltage variations in one sub-pixel are compensated by corresponding adjustments in the other, maintaining light transmissivity consistency while simplifying the control architecture through interdependent voltage management.
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 approach effectively reduces color deviation and enhances image quality by ensuring consistent light transmissivity across various viewing angles, as demonstrated by the improved gamma curves at different viewing angles.
Implementation Method 1
Each of the pixels includes a first sub-pixel, a second sub-pixel and a voltage coupling device. The first sub-pixel includes a first switch device, a first pixel electrode, a first electrode, a first common electrode, and a first storage capacitor. The second sub-pixel includes a second switch device, a second pixel electrode, a second electrode, a second common electrode and a second storage capacitor. The two sub-pixels have different liquid-crystal tilt angles
Implementation Method 2
The two sub-pixels have different liquid-crystal tilt angles, and thus optical effect in the two regions can compensate to each other. Therefore, the above color-deviation issue can be eliminated and image quality of the liquid crystal display can be improved
Implementation Method 3
The first storage capacitor is formed between the first pixel electrode and the first common electrode. The second storage capacitor is formed between the second pixel electrode and the second common electrode
Data Source
AI summary
A liquid crystal display includes a gate driver, a data driver and a pixel matrix. The gate driver is for outputting a plurality of gate signals successively. The data driver is for providing a plurality of data signals. The pixel matrix includes a number of pixels. Each pixel includes a first sub-pixel, a second sub-pixel and a voltage coupling device. The voltage coupling device is coupled between the first sub-pixel and the second sub-pixel such that pixel voltages of the first sub-pixel and the second sub-pixel are different and have relevant variation.