LCD Common Voltage Compensation for Flicker Reduction

Solution Overview

Problem

Existing liquid crystal display panels experience flicker phenomena due to different screen luminance caused by feed-through voltages during positive and negative half-cycles, requiring multiple iterations of common voltage adjustments to minimize flicker, which is inefficient.

Innovation Solution

A compensation method for liquid crystal display panels that involves acquiring alternating frame grayscale data, determining minimum grayscale differences, and calculating a correction value for the common voltage based on gamma voltage differences, allowing flicker reduction with a single adjustment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple iterations of common voltage adjustment are performed to minimize flicker, then flicker reduction is achieved, but adjustment time and production efficiency deteriorate

Engineering Contradiction:

Improveflicker reductionVSAvoidadjustment time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-calculating the relationship between common voltage and grayscale values, and pre-identifying the minimum grayscale difference between adjacent pixel cells. This preparation allows the system to directly determine the optimal common voltage without requiring multiple iterative adjustments during actual production, thereby reducing adjustment time while maintaining flicker reduction effectiveness.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system performs self-service by automatically calculating the correction value for common voltage based on the minimum grayscale difference and the pre-established relationship curve. The compensation value is determined through internal computation rather than requiring external iterative adjustment, enabling the system to self-optimize the common voltage setting in a single step.

Inventive Principle:

Principle #25Self-service

2Reliability

If multiple iterations of common voltage adjustment are performed to minimize flicker, then flicker reduction is achieved, but production capacity deteriorates

Engineering Contradiction:

Improveflicker reductionVSAvoidproduction capacity

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies preliminary action by pre-calculating the relationship between common voltage and grayscale values, and pre-identifying the minimum grayscale difference between adjacent pixel cells. This preparation allows the system to directly determine the optimal common voltage without requiring multiple iterative adjustments during actual production, thereby reducing adjustment time while maintaining flicker reduction effectiveness.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system performs self-service by automatically calculating the correction value for common voltage based on the minimum grayscale difference and the pre-established relationship curve. The compensation value is determined through internal computation rather than requiring external iterative adjustment, enabling the system to self-optimize the common voltage setting in a single step.

Inventive Principle:

Principle #25Self-service

3Measurement precision

If fixed pattern and optical instruments are used for flicker measurement, then flicker value can be measured, but device complexity and operational complexity increase

Engineering Contradiction:

Improveflicker value measurementVSAvoidmeasurement system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces the mechanical/optical measurement system with a computational system. Instead of using fixed patterns and optical instruments to physically measure flicker values, the system uses image data processing and grayscale difference calculation to determine the optimal common voltage. This substitution eliminates the need for complex measurement hardware while achieving the same flicker compensation objective.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system creates a digital copy of the display content through image data, and performs flicker analysis on this digital representation rather than requiring physical optical measurement. By working with grayscale values from captured images and calculating differences between adjacent pixel cells, the system achieves flicker assessment through data processing instead of physical measurement apparatus.

Inventive Principle:

Principle #26Copying

Data Source

PatentUS12475861B2Liquid crystal display panel and compensation method thereof

Publication Date: 2025.11.18 TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO LTD

AI summary

The present disclosure discloses a liquid crystal display panel and a compensation method thereof. The compensation method firstly acquires a plurality of consecutive and alternating odd-numbered frame grayscale data and even-numbered frame grayscale data, then determines a minimum grayscale difference, and determines a gamma voltage difference corresponding to the grayscale difference according to a curve of a relation between grayscales and gamma voltages, followed by obtaining a correction value for a common voltage based on the gamma voltage difference. The flicker phenomena can be improved by adjusting the common voltage only once with the correction value.