OLED Display Gamma Curve Tilt Modulation for Lifespan and Uniformity
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Solution Overview
Problem
Organic light emitting diode (OLED) displays face issues with reduced lifespan due to high brightness images and non-uniformity in low gray scale ranges, leading to accelerated degradation of the organic light emitting layer and poor image uniformity.
Innovation Solution
A method of analyzing digital data for each gray scale range, modulating the gamma curve tilt to adjust brightness, and converting the data into an analog signal to optimize image display, reducing stress on the OLED device and enhancing image uniformity across different brightness levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high brightness images are displayed to improve image quality, then brightness is improved, but the lifespan of the OLED device is reduced due to accelerated degradation of the organic light emitting layer
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the gamma curve tilt based on the gray scale range of the displayed image. For high gray scale ranges (high brightness images), the gamma curve tilt is reduced to lower the brightness and extend OLED lifespan. For low gray scale ranges (low brightness images), the gamma curve tilt is increased to improve brightness and uniformity. This adaptive parameter adjustment resolves the contradiction between brightness and lifespan by optimizing the gamma curve tilt according to the specific display conditions.
2Duration of action of stationary object
If low brightness images are displayed to reduce stress on OLED device, then lifespan is extended, but image uniformity deteriorates in low gray scale ranges
Solution Approach 1:
The patent resolves this contradiction by changing the gamma curve tilt parameter adaptively. When detecting low gray scale range images, the system increases the gamma curve tilt to enhance brightness and improve uniformity across the display, while still maintaining lower overall brightness levels compared to high brightness images. This selective parameter adjustment allows the system to extend OLED lifespan while preserving image uniformity in low brightness conditions.
3Manufacturing precision
If gamma curve tilt is increased to improve brightness in low gray scale images, then image uniformity is improved, but brightness in high gray scale images becomes excessively high causing OLED degradation
Solution Approach 1:
The patent resolves this contradiction through adaptive gamma curve tilt adjustment based on the detected gray scale range. The system dynamically selects the appropriate gamma curve tilt value: higher tilt for low gray scale images to improve uniformity, and lower tilt for high gray scale images to control brightness and prevent OLED degradation. This context-dependent parameter selection allows the system to optimize image uniformity without causing excessive brightness in high brightness conditions.
Solution Approach 2:
The patent applies dynamics by making the gamma curve tilt adjustable and adaptive rather than fixed. The system continuously monitors the gray scale range of the input image and dynamically adjusts the gamma curve tilt in real-time. This dynamic adjustment mechanism allows the system to respond to different display conditions and optimize both image uniformity and brightness control accordingly, preventing OLED degradation while maintaining good image quality.
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 extends the lifespan of OLED devices by reducing brightness in high gray scale images and improving image uniformity in low gray scale images, thereby preventing premature degradation and enhancing overall display quality.
Implementation Method 1
an electron and a hole are collided with each other to be re-combined to generate a light in the organic light emitting layer 78c
Data Source
AI summary
An organic light emitting diode display for changing a data corresponding to an image property to prevent a deterioration of a life span of an organic light emitting diode device and to improve a picture quality, and a driving method thereof are disclosed. In the method, digital data of an input image of a screen are analyzed to analyze an accumulated density distribution for each gray scale range of an image which to be displayed on the screen. The digital data of the input image is modulated to lower a tilt of a gamma curve corresponding to a pre-set high gray scale range among gamma curves of the input image if data belonged to the high gray scale range turned out to be dominant according to the analyzed result. The digital data of the input image is modulated to raise a tilt of a gamma curve corresponding to a specific gray scale range among gamma curves of the input image if data belonged to the specific gray scale is determined as a dominant of the digital data of the input image according to the analyzed result. And the modulated digital data is converted into an analog signal.