OLED Luminance Compensation via Peripheral Imaging
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Solution Overview
Problem
Existing OLED display technologies face challenges in accurately compensating for pixel degradation due to process variations and differences in dummy pixel lifespan, leading to insufficient compensation and potential errors in active display areas.
Innovation Solution
The implementation of a system with luminance measuring units and a processing unit that measures and compares luminance data to detect degraded pixels, calculates their position, and adjusts driving voltages to compensate for degradation without relying on a dummy pixel, directly reflecting and compensating actual active pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a dummy pixel is used to measure degradation data, then the measurement process is simplified, but the compensation accuracy deteriorates due to process variations and lifespan differences between dummy pixels and active pixels
Solution Approach 1:
The patent extracts the luminance measurement function from the dummy pixel approach and implements it directly on active pixels through the imaging unit. This eliminates the intermediary dummy pixel that caused measurement inaccuracies due to process variations and lifespan differences, while maintaining measurement simplicity.
Solution Approach 2:
The patent introduces an imaging unit as a new intermediary component that captures luminance data directly from active pixels. This mediator resolves the contradiction by providing accurate measurement of active pixels without requiring dummy pixels, thus improving measurement precision while keeping the system relatively simple.
2Ease of manufacture
If dummy pixel operational conditions differ from active area conditions, then device manufacturing is simplified, but degradation compensation becomes insufficient and requires increased complexity
Solution Approach 1:
The patent implements a feedback mechanism where the imaging unit continuously monitors luminance of active pixels and the controller adjusts driving signals based on this feedback. This closed-loop system ensures accurate degradation compensation by directly measuring actual active pixel performance and adjusting accordingly, improving reliability without significantly complicating manufacturing.
3Measurement precision
If luminance measurement is performed on active pixels directly, then measurement accuracy is improved, but device complexity increases due to additional imaging components
Solution Approach 1:
The imaging unit serves multiple functions: it measures luminance of active pixels, tracks degradation over time, and provides data for compensation calculations. This multi-functionality justifies the added component while maximizing its utility, improving measurement precision without proportionally increasing overall system complexity.
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 prevents compensation errors by measuring luminance deterioration directly from active pixels, ensuring accurate and effective degradation compensation, thereby maintaining image quality and extending OLED display lifespan.
Implementation Method 1
the luminance measuring units include at least one photo sensor
Data Source
AI summary
An organic light emitting diode (OLED) display and a method of compensating for degradation are disclosed. One inventive aspect includes a panel assembly including a plurality of pixels. Luminance measuring units are formed along a perimeter of the panel assembly to measure luminance of light emitted from the pixels. A processing unit compares the measured luminance data so as to detect and also compensate for a degraded pixel.