Grayscale Compensation for Liquid Crystal Display Smearing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display devices, particularly in VR glasses, face challenges in achieving target liquid crystal inversion states within one frame due to limited response speed, leading to insufficient brightness and smearing issues, which existing overdrive technologies cannot adequately address.
Innovation Solution
A grayscale compensation method that detects display regions needing compensation, acquires a grayscale conversion timetable and compensation lookup table, and compares reserved response time with conversion time to perform precise grayscale adjustments, ensuring all sub-pixel units achieve the target inversion state within one frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If overdrive technology is used to perform grayscale compensation, then the liquid crystal can reach the desired deflection target in a relatively short time, but the display brightness is not as expected and smearing occurs in the dynamic image
Solution Approach 1:
The patent segments the display screen into multiple display regions and divides the grayscale compensation process into multiple stages. Different grayscale voltages are applied to different regions at different time points, allowing precise control of liquid crystal deflection angles while avoiding overcompensation that causes smearing and brightness issues
Solution Approach 2:
The patent implements dynamic grayscale compensation by continuously adjusting grayscale voltages based on real-time detection of liquid crystal deflection angles. The compensation process is divided into multiple time points within each frame, with voltages dynamically adjusted to reach target angles without overshooting, thereby improving response speed while maintaining brightness accuracy
2Productivity
If the liquid crystal display operates at high frame rate, then the display refresh speed increases, but the reserved response time for liquid crystal becomes insufficient to achieve target deflection angle
Solution Approach 1:
The patent applies preliminary grayscale compensation voltages at multiple time points before the liquid crystal reaches its target deflection angle. By proactively adjusting voltages in advance and using detection circuits to monitor the deflection angle at each stage, the system ensures the liquid crystal reaches the target angle precisely within the limited frame time, enabling high frame rates without sacrificing response completeness
Solution Approach 2:
The patent incorporates detection circuits that provide real-time feedback on liquid crystal deflection angles at multiple time points during each frame. This feedback mechanism allows the system to adjust grayscale voltages dynamically, ensuring the liquid crystal reaches target angles even with reduced response time at high frame rates, thereby maintaining both high productivity and complete liquid crystal inversion
Data Source
AI summary
The present disclosure provides a grayscale compensation method, a gray-scale compensation assembly, and a liquid crystal display device. The gray-scale compensation method includes: detecting a display region for compensation in the liquid crystal display screen that needs grayscale compensation under a reserved liquid crystal response time; acquiring a grayscale conversion timetable of the liquid crystal display screen, and obtaining a limit value of conversion time of the liquid crystal display screen according to the grayscale conversion timetable; acquiring a compensation grayscale lookup table of the display region for compensation; comparing the reserved liquid crystal response time and the limit value of conversion time to obtain a time comparison result; performing grayscale compensation on the display region according to the time comparison result, the grayscale conversion timetable and the compensation grayscale lookup table.