Display Device Pre-Charging Compensation for Luminance Mura
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Solution Overview
Problem
High-resolution display devices face challenges in maintaining image quality due to insufficient charging time for pixels, particularly when polarity reversal of data voltage is implemented, leading to luminance deviations and display mura issues.
Innovation Solution
A display device and image signal compensating method that utilize a compensation LUT to calculate correction values for pre-charged pixels, adjusting the charging rate by adding or subtracting these values to ensure consistent luminance across pixels, thereby improving image quality and reducing mura.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the display device is increased, then the image quality is improved, but the charging time for pixels becomes insufficient
Solution Approach 1:
The patent implements a pre-charging method where pixels are charged in advance before the main charging period. Specifically, pixels in odd-numbered rows are pre-charged during the charging of even-numbered rows, allowing the full charging time to be utilized and ensuring sufficient charging time even at high resolutions without compromising image quality
2Reliability
If the polarity of the data voltage is reversed to prevent deterioration, then the liquid crystal layer is protected, but the charging time becomes insufficient
Solution Approach 1:
The patent applies pre-charging before polarity reversal to ensure pixels are adequately charged. The pre-charging method charges pixels in advance during the charging of other rows, so when polarity reversal occurs, the pixels already have sufficient charge, preventing both deterioration and charging time insufficiency
3Duration of action of moving object
If the pre-charging method is used to supplement charging time, then the charging time is extended, but luminance deviation occurs
Solution Approach 1:
The patent applies different charging strategies to different rows of pixels. Odd-numbered rows are pre-charged while even-numbered rows are charged normally, and vice versa. This localized differentiation ensures that each row receives appropriate charging treatment, extending charging time where needed while maintaining luminance consistency through controlled local variations
Solution Approach 2:
The patent incorporates compensation for luminance deviation through feedback mechanisms. The system monitors and adjusts charging parameters based on observed luminance variations, using this feedback to correct deviations and ensure consistent luminance across all pixels while maintaining the benefits of extended charging time
Data Source
AI summary
A display device includes a first pixel connected to a first gate line and a data line, a second pixel connected to a second gate line, different from the first gate line, and the data line, the second pixel being pre-charged when the first pixel is charged, a compensation LUT which stores LUT values for compensating a charging rate during a main charging of the second pixel; and an image signal processor which generates a compensated image signal for the main charging of the second pixel. The image signal processor may include a correction value calculating unit which calculates a correction value from the compensation LUT based on first and second input image signal of respective first and second pixels, and a compensated value generating unit which generates a compensated image signal for the second pixel based on the correction value and the second input image signal.