OLED Display Deterioration Compensation via Dummy Pixel Luminance Sensing
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Solution Overview
Problem
Conventional methods for compensating OLED deterioration in organic light emitting displays only account for changes in resistance values, failing to accurately restore desired luminance, as they do not extract luminance information effectively.
Innovation Solution
Incorporating dummy pixels and photodiodes adjacent to each other, with a sensing unit that extracts resistance and luminance information from both, allowing for accurate compensation of OLED deterioration by generating and processing corresponding data signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only resistance values of OLEDs are extracted for deterioration compensation, then the extraction process is simple, but luminance information is not accurately obtained leading to incorrect compensation
Solution Approach 1:
The patent introduces dummy pixels as intermediary elements that generate light with predetermined luminance. These dummy pixels serve as reference standards for comparison, allowing the sensing unit to accurately measure actual luminance by comparing it against the known dummy pixel luminance, thereby solving the problem of inaccurate luminance information extraction without significantly complicating the overall system
Solution Approach 2:
The patent creates a copy of the pixel structure in the form of dummy pixels that are identical in construction but designed to emit predetermined luminance. These copied structures serve as reference standards for luminance measurement, enabling accurate deterioration detection by comparing actual pixel performance against the copied reference standards
2Reliability
If dummy pixels and photodiodes are added to extract luminance information, then OLED deterioration compensation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the display into two functional areas: effective display units for image display and dummy display units for luminance reference. This segmentation allows the system to maintain high reliability by dedicating specific regions to reference functions while preserving the majority of the display area for image output, thereby minimizing the impact on overall device complexity
Solution Approach 2:
The patent applies local quality by giving different functions to different regions of the display. Dummy pixels in specific locations provide predetermined luminance references, while photodiodes in corresponding locations measure actual luminance. This localized functional differentiation enables accurate deterioration compensation without requiring the entire display structure to be modified
3Measurement precision
If resistance information and luminance information are both extracted and used, then deterioration compensation is precise, but data processing complexity increases
Solution Approach 1:
The patent implements feedback by using the extracted luminance information to adjust and compensate for OLED deterioration. The sensing unit continuously monitors luminance output, compares it against the predetermined dummy pixel luminance, and feeds this information back to correct display output, thereby achieving precise deterioration compensation through a closed-loop control system
Solution Approach 2:
The patent utilizes parameter changes by monitoring variations in resistance values and luminance output over time. By tracking these parameter changes and comparing them against baseline values from dummy pixels, the system can detect deterioration trends and adjust compensation parameters accordingly, achieving precise compensation through dynamic parameter adjustment
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 enables precise compensation for OLED deterioration, ensuring stable and accurate luminance restoration by utilizing resistance and luminance information to adjust data signals, thereby improving display quality.
Implementation Method 1
at least one photodiodes arranged on the dummy display unit to be adjacent to the dummy pixels... extracting luminance information corresponding to the second resistance information from the photodiodes
Implementation Method 2
the organic light emitting display displays an image using organic light emitting diodes (OLEDs) that generate light components by re-combination of electrons and holes
Data Source
AI summary
An organic light emitting display capable of improving display quality. The organic light emitting display includes effective pixels positioned in an effective display unit, at least one dummy pixels positioned in a dummy display unit in order to generate light with predetermined luminance, at least one photodiodes arranged on the dummy display unit to be adjacent to the dummy pixels, and a sensing unit for extracting first resistance information from organic light emitting diodes (OLED) included in the effective pixels, extracting second resistance information from OLEDs included in the dummy pixels, and extracting luminance information corresponding to the second resistance information from the photodiodes.