Adaptive Gamma Voltage Control for LCD Crosstalk Reduction
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Solution Overview
Problem
Liquid crystal display (LCD) devices face challenges in achieving improved display quality due to issues with crosstalk patterns, which affect image clarity and flicker, especially in areas with varying grayscale levels.
Innovation Solution
A display device and method that utilize a gamma voltage generator to apply asymmetric or symmetric gamma data voltages based on the presence of crosstalk patterns in image data, with interpolation gamma used during transition periods, to optimize display quality by reducing horizontal crosstalk and flicker across different grayscale areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If asymmetric gamma is applied to improve display quality for normal image data, then grayscale accuracy is improved, but horizontal crosstalk increases when crosstalk patterns are present
Solution Approach 1:
The gamma mode dynamically switches between asymmetric and symmetric based on the detected image content. The image analyzing part identifies whether the current frame contains crosstalk patterns, and the gamma voltage generator adjusts the gamma mode accordingly, making the system adaptive rather than static.
Solution Approach 2:
The patent changes the gamma voltage parameters from asymmetric to symmetric mode depending on the image content. When crosstalk patterns are detected, the system switches to symmetric gamma voltages; otherwise, it uses asymmetric gamma voltages for normal grayscale accuracy.
2Object-affected harmful factors
If symmetric gamma is applied to reduce horizontal crosstalk, then crosstalk is reduced, but grayscale accuracy deteriorates for normal image data
Solution Approach 1:
The system dynamically selects between symmetric and asymmetric gamma modes based on real-time image analysis. The gamma voltage generator responds to the image analyzing part's detection results by switching the appropriate gamma mode, optimizing performance for the current frame.
Solution Approach 2:
The gamma voltage parameters are changed from symmetric to asymmetric mode when normal image data is detected. This parameter switching allows the system to maintain grayscale accuracy for regular content while using symmetric mode for crosstalk reduction when needed.
3Measurement precision
If gamma mode switches between asymmetric and symmetric, then display quality is optimized for different content, but flicker increases during transition periods
Solution Approach 1:
The system performs preliminary action by maintaining the current gamma mode during transition periods. When switching from asymmetric to symmetric mode, the system continues using asymmetric mode for a set number of frames after the transition, and vice versa, preventing abrupt changes that cause flicker.
Solution Approach 2:
The patent implements beforehand cushioning by using interpolation gamma modes during transition periods. The interpolation gamma generator provides a gradual transition between asymmetric and symmetric modes, cushioning the switch to prevent sudden changes that would cause visible flicker.
Data Source
AI summary
A display device includes an image analyzing part which determines whether current frame image data includes a crosstalk pattern, and a gamma voltage generator which generates current frame gamma data by applying the asymmetric gamma when the current frame image data do not include the crosstalk pattern, and generates the current frame gamma data by applying a symmetric gamma when the current frame image data includes the crosstalk pattern. The positive polarity and negative polarity data voltages of the asymmetric gamma are asymmetric with each other for each of the grayscales, and the positive polarity and negative polarity data voltages of the symmetric gamma are symmetric with each other for each of the grayscales.