Grayscale Voltage Compensation for LCD Flicker Elimination
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Solution Overview
Problem
Liquid crystal display panels experience uneven voltage distribution due to manufacturing inconsistencies and varying loads, leading to a flicker phenomenon and degraded display effects, particularly when reversing positive and negative polarity grayscale voltages.
Innovation Solution
A grayscale voltage compensating method that adjusts and compensates positive and negative polarity grayscale voltages based on actual voltage distribution across the common electrode, ensuring equal difference values between compensated voltages and the common voltage at opposing positions, thereby eliminating flicker and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AC driving manner is used to prevent liquid crystal polarization, then reliability is improved, but uniformity of voltage difference deteriorates causing flicker phenomenon
Solution Approach 1:
The patent applies local quality by implementing position-dependent compensation voltages across different regions of the common electrode. The common electrode is divided into multiple regions (e.g., first, second, third regions) with different compensation voltage values applied to each region, thereby addressing the non-uniform voltage distribution locally while maintaining AC driving benefits.
Solution Approach 2:
The patent changes the voltage parameter of the common electrode from a single uniform voltage to multiple position-dependent compensation voltages. By adjusting the common voltage according to position (Vcom1, Vcom2, Vcom3 for different regions), the system maintains AC driving while compensating for non-uniformity caused by manufacturing variations and load differences.
2Device complexity
If uniform common voltage is applied to common electrode, then device complexity is reduced, but manufacturing precision requirements increase due to process unevenness
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation voltage values for different regions of the common electrode before actual display operation. The compensation voltages (Vcom1, Vcom2, Vcom3) are determined in advance based on expected manufacturing variations, allowing the system to compensate for process unevenness without increasing real-time computational complexity.
Data Source
AI summary
A liquid crystal display panel and a grayscale voltage compensating method thereof are provided. The compensating method includes: obtaining an actual voltage distribution of a common voltage on a common electrode; and compensating positive polarity grayscale voltages as well as negative polarity grayscale voltages of respective pixel electrodes according to the actual voltage distribution to make that: for a same grayscale value, a difference value between the compensated positive polarity grayscale voltage of each pixel electrode and the common voltage on an opposing position of the pixel electrode on the common electrode is equal to a difference value between the compensated negative polarity grayscale voltage of the pixel electrode and the common voltage on the opposing position. By the above method, the invention can eliminate the flicker phenomenon when the liquid crystal display panel is displaying and therefore the display effect is improved.