Display Device Pixel Degradation Compensation via Dual Sensing
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Solution Overview
Problem
Existing display devices face challenges in accurately compensating for pixel degradation due to defects in the display panel, as the characteristic sensing of pixels is not always accurate, leading to incomplete compensation.
Innovation Solution
A display device comprising a display panel with a gate driver, data driver, power driver, sensing driver, defect determiner, and compensator, which generates sensing data to identify defective coordinates and convert image data based on pixel characteristics, ensuring accurate compensation for pixel degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixel characteristic sensing is performed to compensate for pixel degradation, then display quality is improved, but measurement accuracy deteriorates due to defects in the display panel
Solution Approach 1:
The sensing process is divided into two distinct segments: defect sensing (first sensing signal) and pixel characteristic sensing (second sensing signal). By separating these functions into different time periods and using different sensing approaches, the patent eliminates the interference between defect detection and characteristic measurement, thereby improving both measurement accuracy and compensation reliability
Solution Approach 2:
The patent performs defect sensing before pixel characteristic sensing. By first identifying defective pixels through the first sensing signal and excluding them from subsequent characteristic measurement, the system ensures that only functional pixels are measured for degradation compensation, thus improving measurement precision
2Reliability
If multiple sensing operations are performed to identify defects and measure pixel characteristics, then compensation accuracy is improved, but device complexity increases
Solution Approach 1:
The sensing line and sensing driver are designed to perform multiple functions: they can apply initialization voltage, apply test voltages for defect detection, and measure pixel characteristics. By making the sensing circuit multi-functional, the patent achieves accurate compensation without adding separate dedicated circuits for each function, thus limiting the increase in device complexity
Solution Approach 2:
The patent combines the defect sensing function and pixel characteristic sensing function into a unified sensing process that uses the same sensing line and sensing driver. By merging these functions into a single integrated system rather than separate independent systems, the patent reduces overall device complexity while maintaining dual functionality
Data Source
AI summary
A display device includes a display panel including pixels, a gate driver providing a first gate signal and a second gate signal to each of the pixels, a data driver providing a data voltage to each of the pixels, a power driver providing a first power voltage and a second power voltage to each of the pixels, a sensing driver providing an initialization voltage to each of the pixels, generating first sensing data by receiving a first sensing signal related to a defect of the display panel, and generating second sensing data by receiving a second sensing signal related to a characteristic of each of the pixels, a defect determiner determining a defective coordinate of the display panel based on the first sensing data, and a compensator converting first image data into second image data based on the second sensing data and the defective coordinate.