OLED Lifespan Extension via Luminance and Color Coordinate Correction
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Solution Overview
Problem
Organic light emitting display (OLED) devices experience luminance reduction and color coordinate changes over time, leading to decreased lifespan and residual images, with the development of new materials being cost and time inefficient.
Innovation Solution
A method that estimates a lifespan curve based on initial aging profiles, corrects target luminance and white color coordinates, and stores these corrections in a lookup table to extend the OLED's lifespan, using equations like L=exp(-a(t×(istd)acc)b to model luminance reduction, and accumulates data for various panels to optimize aging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If new materials are developed to enhance OLED lifespan, then the lifespan and luminance stability are improved, but the development cost and time increase significantly
Solution Approach 1:
The patent applies parameter changes by modifying operating conditions (luminance levels, aging profiles) rather than changing materials. The method estimates lifespan curves under different luminance conditions and uses correction values to adjust target luminance, extending OLED lifespan through operational parameter optimization instead of material development
Solution Approach 2:
The patent creates a virtual model (lifespan curve estimation) that copies and predicts long-term aging behavior based on short-term initial aging profiles. This allows lifespan extension to be achieved through software-based correction lookup tables rather than physical material changes
2Reliability
If new materials are developed to enhance OLED lifespan, then the luminance stability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent changes operational parameters (target luminance, white color coordinates) based on estimated lifespan curves to maintain luminance stability. Correction values are stored in lookup tables and applied during operation, achieving luminance stability through parameter adjustment rather than expensive material changes
Solution Approach 2:
The patent uses a virtual lifespan curve model to predict and compensate for luminance degradation. By copying the aging behavior pattern and applying correction values, the system achieves luminance stability without the high manufacturing costs of new materials
3Illumination intensity
If the OLED operates at high luminance, then the display quality is improved, but the lifespan decreases due to accelerated degradation
Solution Approach 1:
The patent implements feedback by continuously estimating the lifespan curve based on initial aging profiles and comparing it against target lifespan curves. Correction values are determined and stored in lookup tables, allowing the system to adjust target luminance dynamically to balance display quality and lifespan
Solution Approach 2:
The patent makes the target luminance dynamic rather than fixed. By estimating lifespan curves under different conditions and applying correction values from lookup tables, the system can adapt target luminance levels to extend lifespan while maintaining acceptable display quality
Data Source
AI summary
A method for aging an organic light emitting display includes estimating a lifespan curve of a display panel based on at least one initial aging profile of the display panel, correcting at least one of a target luminance or a target white color coordinates of the display panel such that the estimated lifespan curve corresponds to a target lifespan curve, and setting a lifespan look up table by storing at least one of the correction value of the target luminance or the correction value of the target white color coordinates.