Display Apparatus Grayscale Conversion for Liquid Crystal Hardening
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Solution Overview
Problem
Liquid crystal displays (LCDs) face issues with afterimages due to consistent voltage application, leading to hardening of the liquid crystal layer and resulting image retention problems.
Innovation Solution
A display device and method that include a grayscale conversion part with a white point adjuster and gamma mixer, which generate data signals for sub-pixels at predetermined time intervals, converting the white point and gamma values to minimize voltage consistency and prevent liquid crystal hardening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the same voltage is applied to a pixel electrode consistently, then the display can maintain stable image output, but the liquid crystal becomes hard and afterimages occur
Solution Approach 1:
The patent applies periodic action by alternating between two different gamma lookup tables (LUTs) with different color temperatures at predetermined time intervals. This periodic switching prevents the liquid crystal from hardening while maintaining stable image output, as the alternating voltage patterns keep the liquid crystal molecules from settling into a fixed hardened state that causes afterimages.
Solution Approach 2:
The patent implements dynamics by dynamically switching between different gamma LUTs based on time intervals or image content analysis. Instead of using a static voltage mapping, the system adaptively changes the voltage-to-grayscale mapping characteristics, ensuring the liquid crystal remains responsive and preventing afterimage formation while maintaining image stability.
2Productivity
If different grayscales are displayed at high refresh rates, then display quality improves, but power consumption increases
Solution Approach 1:
The patent changes parameters by switching between gamma LUTs with different color temperatures (e.g., 6504K and 9300K) to generate temporal contrast. This parameter variation creates perceived motion and depth effects without requiring actual physical movement or high refresh rates, thereby reducing power consumption while maintaining high display quality and visual engagement.
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
The solution effectively minimizes afterimages by dynamically adjusting voltage applied to pixel electrodes, ensuring the liquid crystal remains unhardened and maintaining high display quality.
Implementation Method 1
The pixel electrodes and the opposing electrode have voltages applied to generate an electric field in the liquid crystal layer such that the intensity of the electric field is controlled and transmittance of light passing through the liquid crystal layer is controlled
Implementation Method 2
a liquid crystal layer having dielectric anisotropy interposed therebetween
Data Source
AI summary
A display device includes a display panel including a plurality of sub-pixels, a grayscale conversion part configured to generate a data signal displaying different grayscales to the sub-pixels at a predetermined time interval, and a data driver configured to convert the data signal into a data voltage and to output the data voltage to the display panel.