OLED Brightness Compensation via Aging Characteristic Curves
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Solution Overview
Problem
Organic light-emitting display panels experience a decrease in display brightness over time due to the attenuation of organic light-emitting diodes, leading to inconsistent brightness at different display moments.
Innovation Solution
A display brightness compensation method and system that involves setting aging grayscales and test grayscales for test display panels, periodically illuminating and measuring brightness, calculating brightness-time characteristics, and compensating the actual display brightness of a target panel based on these characteristics to maintain consistent brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If organic light-emitting diodes are used in display panels, then high brightness and fast response are achieved, but display brightness attenuates over time
Solution Approach 1:
The patent applies preliminary action by pre-characterizing the brightness-time decay characteristics of organic light-emitting diodes through aging tests before they are used in the display panel. The system establishes brightness-time characteristic curves that describe how the OLEDs will attenuate over time, allowing the display controller to pre-calculate compensation values that counteract this attenuation during normal operation, thereby maintaining consistent brightness throughout the display's lifetime.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the drive current or voltage parameters of the organic light-emitting diodes based on real-time or pre-stored brightness-time characteristic data. The display controller modifies operational parameters (such as increasing drive current to compensate for aging effects) to counteract the natural attenuation of the OLEDs, ensuring that the display brightness remains consistent despite the inherent degradation of the organic materials over time.
2Productivity
If display panels operate for extended periods, then productivity is maintained, but brightness inconsistency occurs at different display moments
Solution Approach 1:
The patent applies feedback by implementing a system that continuously monitors or references the actual brightness output of the display panel and compares it against the expected brightness based on stored characteristic curves. The display controller uses this feedback information to calculate compensation values that adjust the drive parameters in real-time, ensuring that brightness remains consistent even during extended operation. This closed-loop approach allows the system to adapt to actual aging conditions and maintain reliable brightness performance.
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
The method ensures that the display brightness of the target panel remains consistent or tends to be the same at different display moments, with the actual brightness ratio being between 0.99 and 1.01 of the initial brightness after compensation.
Implementation Method 1
a display panel uses an organic light-emitting diode for display. A light-emitting brightness of the organic light-emitting diode in the display panel attenuates over light-emitting time.
Data Source
AI summary
Provided is a display brightness compensation method including: setting an aging grayscale of a monochrome pixel of each of n test display panels; setting m test grayscales of the monochrome pixel; during a time period, illuminating the aging grayscale of the monochrome pixel, periodically illuminating each test grayscale of the monochrome pixel, and periodically obtaining a test display brightness of the monochrome pixel at the test grayscale at the aging grayscale; calculating a brightness-time characteristic of the monochrome pixel at each of the m test grayscales at the aging grayscale; and compensating an actual display brightness of a monochrome pixel of a target display panel at a current display moment based on the brightness-time characteristic. Both m and n are positive integers greater than or equal to 2. The monochrome pixels of any two test display panels have different aging grayscales.