Display Panel Charging Compensation for Stain Prevention
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Solution Overview
Problem
Display devices face issues with charging-type stains and power consumption due to decreased charging ratios, especially when displaying still images, as the time available for pixel charging decreases with increasing resolution and frame frequency.
Innovation Solution
A display device and driving method that utilize lookup tables to compensate for charging ratios by storing correction values based on pixel positions, allowing for accurate data voltage compensation and reduced heat generation in the data driver, thereby preventing charging-type stains and flicker during still image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the frame frequency and resolution are increased, then the display quality is improved, but the charging ratio of pixels decreases causing charging-type stains
Solution Approach 1:
The patent applies preliminary action by compensating for the data voltage before it is applied to the pixel. The signal controller calculates a compensation value based on the pixel position and the input image signal, then adds this compensation value to the data voltage in advance. This preliminary compensation ensures that even though the charging time is reduced due to high frame frequency and resolution, the pixel still receives sufficient charge to display the correct luminance, thereby preventing charging-type stains while maintaining high display quality.
2Productivity
If the data driver operates at high frequency to support high frame rate, then the productivity is improved, but the heat generation and power consumption increase
Solution Approach 1:
The patent applies parameter changes by modifying the data voltage parameter through compensation. Instead of increasing the frame frequency alone, the system adjusts the data voltage level by adding a compensation value that accounts for the reduced charging time. This allows the display to maintain high frame rates while using a more efficient voltage compensation approach that reduces unnecessary power consumption and heat generation in the data driver, as the compensation is calculated and applied selectively based on pixel position and image content.
3Productivity
If the charging time is reduced to increase frame frequency, then the productivity is improved, but the image quality deteriorates due to insufficient pixel charging
Solution Approach 1:
The patent applies local quality by providing position-dependent compensation values to different pixels based on their specific locations in the display panel. The signal controller determines compensation values that are tailored to each pixel's position, accounting for variations in charging characteristics across the panel. This localized compensation ensures that each pixel receives the appropriate voltage adjustment needed to achieve accurate luminance display, thereby maintaining high image quality even when the charging time is reduced due to increased frame frequency.
Data Source
AI summary
A display device and a driving method thereof are disclosed. In one aspect, the display device includes a display panel including a plurality of pixel rows, a data driver configured to transfer data voltages to the display panel, a gate driver configured to transfer gate signals to the display panel, and a signal controller configured to control the data driver and the gate driver. The pixel rows are divided into i (i is a natural number of 2 or more) pixel row groups including a plurality of pixel rows, respectively. The display panel displays one still image for one frame set including the i sequential frames, and each of the i pixel row groups is charged by receiving the data voltage for each frame of the frame set, and the frames in which the i pixel row groups are charged are different from each other.