Display Device Line Resistance Compensation via Block Modulation
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Solution Overview
Problem
Display devices face image quality deterioration due to line resistance issues, particularly in larger-sized and higher-definition products, where increased line resistance affects the charge amount and waveform of data signals, leading to reduced image quality and increased fabrication costs.
Innovation Solution
A display device incorporates an image signal processor that generates modulation data for each pixel region based on predetermined modulation value tables with different gains, dividing the display region into block regions to compensate for line resistance differences, thereby improving image quality by adjusting gray scale data modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display device is made larger-sized and higher-definition, then the display resolution and size are improved, but the line resistance increases causing image quality deterioration
Solution Approach 1:
The display region is divided into multiple block regions along the second direction, and gray scale data for each block region is modulated using different modulation value tables with different gains. This segmentation allows each block region to be compensated independently for line resistance effects, enabling high-definition large-sized displays without image quality deterioration.
2Ease of manufacture
If the number of data lines is reduced to lower fabrication costs, then the fabrication cost is improved, but the line resistance of each data line increases causing image quality deterioration
Solution Approach 1:
Different modulation value tables with different gains are applied to different block regions based on their specific line resistance characteristics. This local quality approach allows each region to be optimized for its specific conditions, enabling cost-effective designs with fewer data lines while maintaining image quality through region-specific compensation.
Data Source
AI summary
A display device includes an image signal processor generating modulation data of each pixel region corresponding to a display period of each frame based on an image signal and predetermined modulation value tables which are preset to different gains. The image signal processor includes a block divider and at least two data modulators. The block divider divides the display region into at least two block regions along a second direction. The at least two data modulators correspond to the at least two block regions, modulate gray scale data of each of pixel regions included in each block region based on a modulation value table, and generate modulation data of the pixel regions included in each block region. As a result, a difference in the charge amount caused by line resistance can be compensated according to the overdriving scheme, resulting in prevention of image quality deterioration.