Color Shift Compensation in LCD Fan Section via Localized Voltage Adjustment
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Solution Overview
Problem
Liquid Crystal Display (LCD) panels experience color shift issues due to impedance differences in the fan section, leading to inconsistent voltage distribution across sub-pixel dots, resulting in biased color display.
Innovation Solution
A color shift compensation method and device that divides the LCD panel into display areas with varying numbers of display lines, using a relationship table to adjust the voltage of each sub-pixel dot based on input and previous output gray scale data, ensuring consistent color display by implementing digital to analog conversion and adjusting the voltage accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the distances of display lines from the driving integrated circuit are different, then the resistance of the two sides of the fan area becomes larger, but the voltage distribution becomes inconsistent
Solution Approach 1:
The patent applies local quality by dividing the display panel into multiple display areas with different numbers of display lines based on their distance from the driving integrated circuit. Display areas farther from the circuit have more display lines to compensate for higher resistance, while closer areas have fewer lines. This local differentiation ensures uniform voltage distribution across the entire panel despite varying distances.
2Manufacturing precision
If the charge periods of the respective display lines are not consistent, then the voltage hold by the sub pixel dot cannot reach the ideal voltage level, but increasing charge period uniformly across all lines causes delay
Solution Approach 1:
The patent implements dynamic charge period adjustment by varying the charge period of display lines based on their position and resistance characteristics. Display lines with higher resistance (typically at the edges) are allocated longer charge periods, while lines closer to the driving circuit with lower resistance receive shorter charge periods. This dynamic allocation ensures each line achieves ideal voltage levels without uniform delay across the entire panel.
3Manufacturing precision
If the resistance of the two sides of the fan area is larger, then the brightness of the primary colors displayed becomes biased darker, but adjusting brightness uniformly affects the entire display
Solution Approach 1:
The patent applies local quality by implementing brightness compensation specifically in display areas with higher resistance (typically the two sides of the fan area). The relationship table stores and applies brightness adjustment data only to these affected regions, leaving the central areas with lower resistance unchanged. This localized brightness adjustment corrects the darker bias in high-resistance areas without affecting the overall display uniformity or requiring complex global adjustments.
Data Source
AI summary
The color shift compensation method comprises: receiving target input gray scale data of a target sub pixel dot in a present line, and acquiring previous output gray scale data of a sub pixel dot of the previous line in the same display data line of the target sub pixel dot, and then, implementing digital to analog conversion to the target output gray scale data of the target sub pixel dot simultaneously corresponding to the target input gray scale data and the previous output gray scale data with combination of the target relationship table to acquire the target voltage of the target sub pixel dot, and ultimately, adjusting a color displayed by a target pixel where the target sub pixel dot is. With the present invention, the color shift issue due to the resistance difference of the fan section can be solved to promote the display effect.