OLED Display Compensation for Temperature and Threshold Voltage Drift
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Solution Overview
Problem
Current display compensation schemes for OLED screens, particularly for large-size displays, are incomplete, leading to reduced display precision and increased costs due to non-self-developed technologies, and face issues such as poor screen uniformity, temperature-dependent grayscale changes, and aging threshold voltage offsets.
Innovation Solution
A display compensating method that converts grayscale signals to brightness signals, performs optical compensation, and adjusts threshold voltages and operating parameters based on temperature, using look-up tables and cathode potential adjustments to ensure precise display across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional display compensation schemes are used for OLED screens, then implementation is simpler, but display precision deteriorates and costs increase
Solution Approach 1:
The patent segments the compensation process into three distinct modules: optical compensation (converting grayscale to brightness and back), electrical compensation (threshold voltage compensation using look-up tables), and temperature compensation (cathode potential adjustment based on temperature). This segmentation allows each module to address specific compensation needs independently, improving overall display precision while maintaining manageable system complexity through modular design.
Solution Approach 2:
The patent implements preliminary action by pre-calculating and storing threshold voltage compensation data in look-up tables during the manufacturing process, and by performing optical compensation transformations in advance. This allows the display device to apply pre-computed compensation values during operation, enhancing display precision without requiring complex real-time calculations that would increase device complexity.
2Measurement precision
If comprehensive compensation is implemented to improve display precision, then manufacturing costs increase due to non-self-developed technology
Solution Approach 1:
The patent applies self-service by enabling the display device to perform its own compensation operations using integrated optical, electrical, and temperature compensation modules. The device autonomously adjusts threshold voltages, corrects optical non-uniformities, and compensates for temperature effects without requiring external compensation equipment or proprietary external technology, thereby reducing manufacturing costs while maintaining high display precision.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting electrical parameters (threshold voltages via look-up tables, cathode potential via temperature sensing) and optical parameters (brightness transformation) to achieve comprehensive compensation. This approach allows the system to achieve high display precision through software-based parameter adjustment rather than expensive hardware modifications, improving ease of manufacture.
3Adaptability or versatility
If temperature compensation is added to address grayscale changes, then device complexity increases
Solution Approach 1:
The patent merges temperature compensation with the existing optical and electrical compensation modules into a unified compensation system. The temperature sensing unit integrates with the cathode potential adjustment mechanism, allowing the system to simultaneously handle optical non-uniformity, threshold voltage drift, and temperature-dependent grayscale changes through a single integrated control architecture, thereby improving temperature adaptability without proportionally increasing device complexity.
Solution Approach 2:
The patent implements universality by designing the cathode potential adjustment mechanism to serve multiple functions: it compensates for both temperature-induced grayscale changes and maintains overall display uniformity across different operating conditions. This multi-functional approach allows a single module to address multiple compensation needs, improving temperature adaptability while minimizing the increase in device complexity.
Data Source
AI summary
A display compensating method, display compensating device, and display device are provided, which relates to field of display and addresses the issues of poor screen uniformity, grayscale relationship change of sub-pixel due to ambient temperature change, and display screen brightness affected by ageing offset of threshold voltage corresponding to the sub-pixel. The display compensating method is applied to the display device, including: converting a received grayscale signal into a brightness signal; performing an optical compensation on a display brightness of the display device based on the brightness signal; converting a corresponding brightness signal on which the optical compensation is performed into a voltage signal; compensating for a threshold voltage corresponding to each sub-pixel in the display device based on the voltage signal; and compensating for operating parameters of the display device for the display device at different operating temperatures.