OLED Display Compensation for Leakage Current Reduction
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Solution Overview
Problem
Organic light emitting display devices face issues with maintaining image brightness due to OLED deterioration, where existing compensation methods are hindered by leakage current from non-sensing pixels, reducing the reliability of extracted deterioration and threshold voltage information.
Innovation Solution
The organic light emitting display device includes a compensation unit that extracts deterioration information and threshold voltage information from specific pixels during a sensing period, while supplying the same white data signal to other pixels to minimize leakage current, thereby improving the accuracy and reliability of extracted information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing compensation methods are used to extract deterioration information from OLEDs, then compensation for image brightness can be achieved, but leakage current from non-sensing pixels reduces the reliability of extracted information
Solution Approach 1:
The patent extracts only the necessary sensing pixels from the entire pixel array during the sensing period, while turning off or suppressing non-sensing pixels. This isolation of the sensing region eliminates leakage current from non-sensing pixels, thereby improving the reliability of deterioration information extraction without requiring compensation for harmful leakage effects.
2Measurement precision
If all pixels are kept active during sensing, then complete image data can be captured, but leakage current increases and reduces measurement accuracy
Solution Approach 1:
The patent divides the pixel array into sensing pixels and non-sensing pixels during the sensing period. By segmenting the active region and selectively activating only the necessary sensing pixels while suppressing others, the method achieves precise measurement of deterioration information without the interference of leakage current from inactive pixels.
3Measurement precision
If a sensing period is implemented to extract OLED deterioration information, then compensation accuracy improves, but additional time is required for sensing operations
Solution Approach 1:
The patent implements a periodic sensing operation where a dedicated sensing period is allocated within the overall display refresh cycle. During this periodic sensing interval, deterioration information is extracted from selected pixels, and the remaining time is used for normal display operations. This periodic approach balances measurement precision with time efficiency by concentrating sensing activities in specific intervals rather than continuously.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the reliability of deterioration and threshold voltage information extraction by reducing leakage current from other pixels, allowing for more accurate compensation and maintaining desired image brightness.
Implementation Method 1
organic light emitting display devices display images using organic light emitting diodes (OLEDs) that generate light by recombination between electrons and holes
Data Source
AI summary
An organic light emitting display device includes: pixels at crossing regions of data lines and scan lines, each of the pixels including an organic light emitting diode (OLED); a scan driver configured to drive the scan lines; a data driver configured to drive the data lines; a control line driving unit configured to drive control lines; and a compensation unit configured to extract at least one of deterioration information of the OLED or threshold voltage information of a driving transistor from at least one of the pixels during a sensing period. The data driver is further configured to supply a same first data signal to each of the pixels other than the at least one of the pixels in the sensing period.