Liquid Crystal Display Pixel Sub-Polarity Compensation
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Solution Overview
Problem
Liquid crystal display devices using the dot inversion method suffer from flickers and residual images due to varying feed-through voltages, which affect the consistency of gray level representation and brightness across frames.
Innovation Solution
The liquid crystal display device divides each pixel into first and second sub-pixels with different polarities, allowing for the same gray level to be expressed using positive and negative data voltages, ensuring the effective value of the data voltage is fixed regardless of polarity, and optimizing the common voltage to minimize flickers and residual images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the dot inversion method is used to drive liquid crystal display devices, then the viewing angle and aperture ratio are improved, but flickers and residual images occur due to varying feed-through voltages
Solution Approach 1:
The pixel is divided into first and second sub-pixels with different polarities. Each sub-pixel has its own liquid crystal cell that can be independently driven with opposite polarity voltages, allowing the feed-through voltage to be compensated and stabilized, thereby eliminating flickers while maintaining wide viewing angle
Solution Approach 2:
The invention changes the polarity parameter of the drive voltages applied to adjacent sub-pixels. By alternating between positive and negative polarities in a checkerboard pattern, the feed-through voltage effect is inverted and compensated, stabilizing the gray level representation and eliminating flickers
2Adaptability or versatility
If the dot inversion method is used to drive liquid crystal display devices, then the aperture ratio is improved, but residual images occur due to varying feed-through voltages
Solution Approach 1:
The pixel is divided into first and second sub-pixels with different polarities. Each sub-pixel has its own liquid crystal cell that can be independently driven with opposite polarity voltages, allowing the feed-through voltage to be compensated and stabilized, thereby eliminating flickers while maintaining wide viewing angle
Solution Approach 2:
The invention changes the polarity parameter of the drive voltages applied to adjacent sub-pixels. By alternating between positive and negative polarities in a checkerboard pattern, the feed-through voltage effect is inverted and compensated, stabilizing the gray level representation and eliminating flickers
3Illumination intensity
If a common electrode plate is formed in each pixel area to form fringe field, then the aperture ratio and transmittance are improved, but the device complexity increases
Solution Approach 1:
The common electrode plate is merged with the pixel electrode structure, where the pixel electrode serves dual functions as both the data electrode and the common electrode for forming fringe fields. This integration eliminates the need for separate common electrode plates in each pixel area, reducing structural complexity while maintaining high transmittance
Solution Approach 2:
The pixel electrode is designed to perform multiple functions: serving as the data electrode for voltage application and as the common electrode for fringe field formation. This multi-functionality reduces the number of separate electrode structures needed, simplifying the overall device architecture while maintaining high aperture ratio and transmittance
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 allows for consistent brightness expression across frames, eliminating flickers and residual images by stabilizing the gray level representation and optimizing the common voltage between positive and negative data voltages.
Implementation Method 1
forms a gap between the common electrode plate and the pixel electrode to be narrower than a gap between the upper and lower substrates, thereby forming the fringe field. Liquid crystal molecules filled in a space between the upper and lower substrates are operated by the fringe field
Implementation Method 2
The pixel electrode slit 18 forms a fringe field with a common electrode plate 14 to make liquid crystal molecules rotate by dielectric anisotropy
Implementation Method 3
A storage capacitor Cst that stably maintains the video signal supplied to the pixel electrode slit 18 is formed between the common electrode plate 14 and the pixel electrode slit 18
Data Source
AI summary
There is disclosed a liquid crystal display device and driving method are provided. The liquid crystal display device includes a liquid crystal display panel where pixels are defined by gate lines and data lines that are arranged in a matrix shape. A gate driver is operable to supply a gate voltage to the liquid crystal display panel. A data driver is operable to supply a data voltage to the liquid crystal display panel. The pixels are each independently operable to be driven by drive voltages, which have different polarities from each other, and include first and second liquid crystal cells which realize the same gray level.