OLED Brightness Compensation via Image Contrast Control
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Solution Overview
Problem
OLED display devices experience brightness degradation due to aging of driving thin film transistors and organic light-emitting diodes, limiting the effectiveness of conventional brightness compensation systems which are constrained by hardware limitations, leading to reduced display quality and user experience.
Innovation Solution
A brightness compensation system for OLED display devices that includes an image-contrast control unit to enhance image contrast based on detected aging parameters, followed by aging compensation, using specific formulas to adjust pixel brightness values, thereby preventing brightness degradation and ensuring display quality and user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional brightness compensation systems increase pixel voltage to compensate for OLED aging, then brightness degradation is compensated, but hardware limitations prevent unlimited voltage increase, causing compensation effectiveness to deteriorate when aging parameters continue to increase
Solution Approach 1:
The patent transforms the brightness compensation approach from voltage adjustment to contrast parameter adjustment. By detecting aging parameters and dynamically adjusting image contrast parameters, the system achieves brightness compensation without being constrained by hardware voltage limits, enabling effective compensation even under severe aging conditions
Solution Approach 2:
The patent introduces image contrast as an intermediary parameter between the aging detection and brightness compensation. Instead of directly adjusting pixel voltage, the system uses contrast adjustment of the displayed image as a mediator to achieve the desired brightness compensation effect, bypassing hardware limitations
2Illumination intensity
If pixel voltage is increased to compensate for aging, then brightness is maintained, but hardware voltage limits are reached, causing brightness to decline again and worsening user experience
Solution Approach 1:
The system changes the control parameter from pixel voltage to image contrast. By adjusting contrast parameters software-based rather than voltage hardware-based, the system can maintain display brightness without being constrained by maximum voltage limits, thereby preserving user experience even under severe aging
3Reliability
If conventional brightness compensation is used, then some aging effects are mitigated, but the system becomes ineffective when aging parameters exceed compensation capacity, leading to reduced display quality
Solution Approach 1:
The patent implements a feedback mechanism where aging parameters are continuously detected and used to dynamically adjust image contrast parameters. This closed-loop feedback system enables the display quality to be maintained over extended periods by continuously adapting to aging effects, significantly extending the effective compensation duration compared to conventional open-loop voltage compensation
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 system effectively maintains display quality and enhances user experience by preventing brightness decline through contrast enhancement and targeted brightness adjustments, improving product competitiveness.
Implementation Method 1
The OLED is a current-driving element. When the electrical current flows through the organic light emitting diode, the organic light emitting diode emits light, and the brightness is determined according to the current flowing through the organic light emitting diode itself
Data Source
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AI summary
A brightness compensation system and a brightness compensation method for an OLED display apparatus. The system comprises: an image pre-processing unit (10), an image contrast ratio control unit (50) electrically connected to the image pre-processing unit (10), an ageing compensation unit (20) electrically connected to the image contrast ratio control unit (50), an ageing parameter detection unit (30) electrically connected to both the ageing compensation unit (20) and the image contrast ratio control unit (50), and an OLED display panel electrically connected to both the ageing compensation unit (20) and the ageing parameter detection unit (30); before ageing compensation, the contrast ratio of an image to be displayed is improved by means of the image contrast ratio control unit (50) on the basis of ageing parameters, and ageing compensation of the image to be displayed having an improved contrast ratio and display of same is then performed. Reduction of the brightness of the OLED display apparatus due to ageing is thus prevented, ensuring the display quality of the OLED display apparatus and improving the user experience and the competitiveness of the product.