Electroluminescent Display Pixel Degradation Compensation
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Solution Overview
Problem
Existing electroluminescent displays face challenges in accurately compensating for pixel degradation due to variations in electrical characteristics, leading to afterimages and reduced pixel aperture ratios, which are exacerbated by the need for external compensation circuits that decrease accuracy and increase manufacturing costs.
Innovation Solution
An electroluminescent display system that predicts pixel degradation by accumulating image data and adjusting current measurements to generate compensation values, eliminating the need for sensing circuits and increasing pixel aperture ratios through precise compensation data modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an external compensation circuit is used to compensate for pixel degradation, then compensation accuracy is improved, but pixel aperture ratio is reduced
Solution Approach 1:
The patent extracts the compensation function from the pixel structure itself by using a separate external compensation circuit. This allows the pixel to maintain its original structure and aperture ratio while the compensation circuit handles the degradation compensation independently, resolving the contradiction between compensation accuracy and aperture ratio.
Solution Approach 2:
The patent introduces an external compensation circuit as an intermediary between the display controller and the pixel array. This intermediary performs the compensation function outside the pixel structure, allowing accurate compensation without reducing the pixel aperture ratio, as the compensation circuit operates independently from the pixel elements.
2Measurement precision
If sensing circuits are added to each pixel for accurate degradation detection, then pixel degradation detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent extracts the sensing function from individual pixels and implements it externally. By using a separate sensing circuit that operates outside the pixel structure, the system achieves accurate pixel degradation detection without adding complex sensing circuits to each pixel, thereby maintaining simple pixel designs while improving measurement precision.
3Reliability
If compensation circuits are implemented to correct electrical characteristic deviations, then afterimage reduction is improved, but manufacturing cost increases
Solution Approach 1:
The patent implements a universal external compensation circuit that can compensate for electrical characteristic deviations across all pixels simultaneously. This multi-functional approach allows a single compensation circuit design to handle variations in threshold voltage, mobility, and other electrical parameters across the entire display, improving afterimage reduction while avoiding the need for complex individual compensation circuits for each pixel, thereby controlling manufacturing costs.
Data Source
AI summary
Disclosed are an electroluminescent display and a driving method thereof, the method comprising: generating a predicted value, indicating a degree of degradation of pixels, by accumulating pixel data of an input image at each pixel: and generating a compensation value by adjusting the predicted value to a current measurement value which is obtained by measuring a current in a power line connected to the pixels. Compensation data, which is to be written into each of the pixels, is generated by modulating the pixel data with the compensation value.