Display Device Compensation Circuit for Luminance Uniformity
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Solution Overview
Problem
Liquid crystal displays (LCDs) face challenges in achieving uniform luminance due to differences in grayscale values across sub-pixels, leading to variations in charging times and potential luminance deviations.
Innovation Solution
A compensation circuit is introduced to calculate differences in grayscale values between sub-pixels and generate a clock signal that adjusts the charging time and interval of data signals, ensuring uniform luminance by optimizing the timing of data signal input to each sub-pixel based on these differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data signals are supplied to all sub-pixels simultaneously with the same charging time, then the device operation is simple, but luminance uniformity deteriorates due to grayscale value differences across sub-pixels
Solution Approach 1:
The patent applies local quality by differentiating the charging time for each sub-pixel based on its specific grayscale value requirements. The compensation circuit identifies sub-pixels with grayscale values differing by a preset value or more and applies extended charging time specifically to those sub-pixels, rather than uniformly to all sub-pixels. This localized adjustment ensures luminance uniformity while minimizing the impact on overall device complexity.
2Reliability
If the charging time is extended for sub-pixels with significant grayscale differences, then luminance uniformity is improved, but the duration of action increases beyond 1 horizontal time period
Solution Approach 1:
The patent implements dynamics by making the charging time flexible and adaptive rather than fixed. The compensation circuit dynamically adjusts the charging time duration based on real-time detection of grayscale value differences. When a sub-pixel's grayscale value differs by a preset value or more from others, the circuit extends its charging time beyond the standard 1 horizontal time period. This dynamic adjustment optimizes luminance uniformity while adapting to varying display conditions.
3Reliability
If a compensation circuit is added to adjust charging times, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent applies feedback by implementing a compensation circuit that continuously monitors grayscale values of sub-pixels and adjusts charging times accordingly. The circuit detects when grayscale values differ by a preset value or more and provides compensatory extended charging time to affected sub-pixels. This feedback mechanism ensures luminance uniformity while keeping the complexity management focused on critical adjustments rather than comprehensive system redesign.
Data Source
AI summary
A display device includes a plurality of pixels, each including a first sub-pixel indicating a first color, a second sub-pixel indicating a second color, and a third sub-pixel indicating a third color, data lines coupled to pixels arranged in a first direction and configured to supply a data signal to the coupled pixels, gate lines coupled to pixels arranged in a second direction crossing the first direction and configured to supply a gate signal to the coupled pixels, and a compensation circuit configured to calculate a difference between grayscale values of a data signal to be supplied to the first to third sub-pixels, and generate a clock signal based on the difference that controls a start time at which the data signal is inputted to the pixels.