Liquid Crystal Display Sub-Pixel Electrode Structure for Gamma Correction
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Solution Overview
Problem
Conventional liquid crystal display devices with twisted nematic mode exhibit poor gamma characteristics, leading to reduced contrast and noticeable gray level reversal when viewed from different angles, resulting in suboptimal display quality.
Innovation Solution
The liquid crystal display device is designed with a matrix of pixel units, each comprising a central first sub-pixel electrode and a circumferentially arranged second sub-pixel electrode, with distinct drive voltages and auxiliary capacitors to improve gamma characteristics by controlling liquid crystal molecule alignment and inclination angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If twisted nematic mode is used to control light transmission, then the liquid crystal display device can achieve basic display function, but the gamma characteristics deteriorate and gray level reversal occurs when viewed from inclined directions
Solution Approach 1:
The pixel electrode is divided into multiple independent sub-pixel electrodes (first sub-pixel electrode and second sub-pixel electrode) within each pixel unit. This segmentation allows different drive voltages to be applied to different regions, enabling independent control of liquid crystal alignment in various areas to compensate for viewing angle effects and maintain consistent gamma characteristics across different observation directions.
Solution Approach 2:
Different drive voltages are applied to different sub-pixel electrodes based on their specific positions and functions. The first sub-pixel electrode receives a first drive voltage while the second sub-pixel electrode receives a second drive voltage, creating local variations in electric field strength that optimize liquid crystal molecule alignment for both front and inclined viewing angles, thereby improving local display quality without compromising overall performance.
2Device complexity
If a single pixel electrode structure is used, then the device structure is simple, but the gamma characteristic performance is poor and gray level reversal occurs
Solution Approach 1:
Each pixel electrode is segmented into multiple sub-pixel electrodes with distinct drive voltages, transforming a simple single-electrode structure into a multi-electrode configuration. This segmentation enables precise control over liquid crystal alignment in different regions, eliminating gray level reversal and improving gamma characteristics while maintaining reasonable structural complexity through systematic arrangement of the sub-pixels.
Solution Approach 2:
The patent introduces a new dimension of control by applying different drive voltages to different sub-pixel electrodes within the same pixel unit. This voltage dimensionality allows independent manipulation of liquid crystal alignment angles in different spatial regions, enabling compensation for viewing angle effects and improvement of gray level display accuracy without fundamentally changing the overall pixel architecture.
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 gamma characteristic performance, reducing deviations in gray level display across different viewing angles and improving overall display quality by maintaining consistent brightness and contrast.
Implementation Method 1
controls the amount of light transmitting through the liquid crystal layer by applying the characteristics that optic chirality of liquid crystal molecules varies with the change of voltage applied
Implementation Method 2
an auxiliary capacitor corresponding to the first sub-pixel electrode and an auxiliary capacitor corresponding to the second sub-pixel electrode
Data Source
AI summary
The present invention provides a liquid crystal display device, which includes a plurality of pixel units arranged in a matrix form. Each of the pixel units further includes a first sub-pixel electrode and a second sub-pixel electrode. The first sub-pixel electrode is set at a central position of the pixel unit. The second sub-pixel electrode is circumferentially set along a circumference of the first sub-pixel electrode. With the above arrangement, the present invention improves the γ view angle characteristics of the liquid crystal display device to provide enhanced performance of displaying of the liquid crystal display device and thus improving quality of displaying.