Liquid Crystal Display Common Voltage Compensation for Crosstalk
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Solution Overview
Problem
Liquid crystal display devices experience issues with one line crosstalk and moving striped stains due to uneven polarity of data voltages applied to sub-pixels, leading to luminance differences and visible defects.
Innovation Solution
A liquid crystal display device and driving method that include a common voltage compensator to analyze image data and adjust the common voltage by adding compensating voltages with opposite polarity to the data voltages applied to sub-pixels, ensuring the common voltage remains constant across the panel, particularly during transitions between frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If data voltages with different polarities are applied to adjacent sub-pixels, then color display capability is improved, but one line crosstalk and moving striped stains occur
Solution Approach 1:
The common voltage compensator performs preliminary compensation by detecting boundaries between patterns with different polarities and pre-adjusting the common voltage before the harmful crosstalk effect fully develops. This prevents the moving striped stains and one line crosstalk from becoming visible defects in the displayed image.
2Device complexity
If common voltage is not compensated, then device complexity is reduced, but luminance uniformity deteriorates
Solution Approach 1:
The common voltage compensator operates autonomously by self-detecting polarity boundaries in the image data and self-adjusting the common voltage accordingly. This self-service mechanism maintains luminance uniformity without requiring external intervention or complex additional hardware, thus not significantly increasing device complexity.
3Manufacturing precision
If common voltage is dynamically adjusted, then image quality is improved, but stability of voltage supply deteriorates
Solution Approach 1:
The common voltage compensator dynamically adjusts the common voltage based on real-time detection of polarity boundaries in the image data. The compensation is applied only when necessary (when boundaries are detected) and ceased when patterns are uniform, thus maintaining image quality while preserving voltage stability during normal operation.
Data Source
AI summary
Provided if a display device including a liquid crystal panel, a common voltage generator configured to generate a common voltage, and a common voltage compensator. The liquid crystal panel includes gate lines, data lines, pixels, and a common electrode. The pixels include first pixels and second pixels. The first pixels and the second pixels are respectively disposed in pixel rows adjacent to each other, respectively constitute different columns, are connected to the same gate line, display the same color, and receive data voltages having different polarities. When a boundary of a pattern included in image data, extending in a first direction, lies between the first pixels and the second pixels, the common voltage compensator is configured to compensate the common voltage.