Display Driver Crosstalk Compensation via Digital Code Difference Summation
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Solution Overview
Problem
Crosstalk in display systems causes abnormal characteristics, such as brighter or darker colors at boundaries between areas with large grayscale differences, due to errors in grayscale voltage generation by source drivers.
Innovation Solution
A method and device that calculate differences between digital codes for pixels connected to the same data and gate lines, sum these differences, generate a compensation code, and add it to the digital codes to produce compensated grayscale voltages, which are then provided to pixels, thereby mitigating crosstalk effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grayscale voltages are generated by source driver for displaying image, then display function is achieved, but crosstalk occurs at boundaries between areas with large grayscale differences causing abnormal characteristics
Solution Approach 1:
The patent applies preliminary action by calculating the difference between current and previous digital codes and generating a compensation code before the actual grayscale voltage is applied to the pixel. This compensation code is added to the current digital code to pre-correct for potential crosstalk effects that would occur at boundaries between different grayscale areas, thereby preventing the abnormal characteristics before they manifest.
Solution Approach 2:
The patent implements feedback by using the previous digital code (from the previously driven gate line) to calculate a difference value that reflects the grayscale transition. This feedback information is then used to generate a compensation code that adjusts the current grayscale voltage, creating a closed-loop system that compensates for crosstalk based on historical display data.
2Object-affected harmful factors
If compensation code is generated by summing differences between digital codes, then crosstalk is reduced, but additional calculation operations increase processing complexity
Solution Approach 1:
The patent applies parameter changes by transforming the digital code through a series of calculations: calculating the difference between current and previous codes, summing these differences to generate a compensation code, and adding this compensation code back to the original digital code. This parameter transformation approach converts the crosstalk problem into a mathematical correction that can be applied systematically without requiring complex circuit modifications.
Data Source
AI summary
Disclosed is a method for driving a display. The method includes calculating differences between digital codes corresponding to grayscale voltages each provided to pixels connected to the same data line and gate lines which are sequentially driven, summing digital code differences of a threshold value or more, generating a compensation code corresponding to the summation result, and providing grayscale voltages compensated with the compensation code to pixels of which digital codes have a difference of less than the threshold value.