Display Signal Controller with Adjacent and Pixel Compensation
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Solution Overview
Problem
Display devices face issues with deteriorating quality due to insufficient charging of pixels, inconsistent gray scale luminance across positions, and high memory capacity requirements for image signal correction.
Innovation Solution
A display device and driving method that include a signal controller with an adjacent image signal compensator and a pixel characteristic compensator, which generate compensation data using weight value tables and pixel characteristic information to correct input image signals, reducing the risk of insufficient charging and ensuring consistent luminance across pixels while minimizing memory usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If image signal correction is performed using comprehensive compensation data for all gray scales and pixels, then display quality and charging sufficiency are improved, but memory capacity requirements increase
Solution Approach 1:
The patent segments the image signal correction process into two distinct compensation stages: adjacent image signal compensation (addressing charging sufficiency) and pixel characteristic compensation (addressing luminance consistency). This segmentation allows each compensator to use optimized, smaller memory structures rather than requiring one comprehensive large memory for all corrections
Solution Approach 2:
The patent applies different compensation strategies to different gray scale ranges. The adjacent image signal compensator uses weight value tables with different multiplication factors (options of multiples) depending on whether the gray scale is in the first range (higher multiplication) or second range (lower multiplication). This local differentiation optimizes memory usage by applying stronger compensation only where charging insufficiency is most critical
2Reliability
If adjacent image signal compensation is applied to prevent insufficient charging, then pixel charging sufficiency is improved, but image signal processing complexity increases
Solution Approach 1:
The adjacent image signal compensator performs preliminary compensation by comparing current gray data with previous gray data before the pixel is fully charged. This preliminary action identifies charging insufficiency early and applies corrective multiplication factors to the image signal, ensuring adequate charging without requiring complex real-time monitoring during the charging process itself
3Manufacturing precision
If pixel characteristic compensation is applied to ensure consistent luminance, then luminance uniformity is improved, but image signal processing complexity increases
Solution Approach 1:
The pixel characteristic compensator adjusts the image signal by applying compensation values derived from pixel characteristic information stored in a lookup table (LUT). This parameter change approach transforms the complex problem of luminance uniformity into a simpler table-lookup and addition operation, significantly reducing processing complexity while maintaining high precision luminance consistency
Data Source
AI summary
A display device includes a plurality of pixels, and a plurality of data lines connected to the plurality of pixels; a data driver for transmitting a data voltage to the data line; and a signal controller for receiving input image signals from the outside and outputting a digital image signal to the data driver. The signal controller includes an adjacent image signal compensator for comparing input gray data of the input image signals to be continuously input to the data line and generating adjacent image signal compensation data based on the comparison, and a pixel characteristic compensator for generating pixel characteristic compensation data according to a characteristic of a pixel to be displayed.