OLED Display Compensation for Luminous Efficiency Degradation
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Solution Overview
Problem
As the emitting time of an organic light-emitting diode increases, luminous efficiency decreases, adversely affecting display quality.
Innovation Solution
A method is developed to extract and compensate image information by calculating an on-pixel ratio based on gamma information, providing maximum current information corresponding to a dimming level, and determining pixel average current information for each pixel, which is stored in a look-up table and updated at predetermined intervals, ensuring the average current of the display panel is optimized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the emitting time of organic light-emitting diode increases, then the display can maintain operation for longer duration, but luminous efficiency decreases
Solution Approach 1:
The patent applies preliminary action by calculating and storing pixel average current information in advance in a look-up table before actual display operation. The controller pre-processes image information to determine compensation values, so that when the display operates for extended periods, the pre-calculated compensation data is already available to maintain luminous efficiency without real-time computation delays.
Solution Approach 2:
The patent changes parameters by dynamically adjusting pixel average current information based on the emitting time and luminous efficiency degradation. The controller modifies display parameters such as gamma information and pixel current levels according to the stored look-up table data, adapting the display operation to compensate for efficiency loss over time.
2Manufacturing precision
If pixel average current information is updated continuously for each pixel, then display quality compensation is improved, but device complexity and processing time increase
Solution Approach 1:
The patent segments the display panel into multiple pixels and processes them in groups or batches rather than individually for each frame. The look-up table stores compensation information that can be applied to multiple pixels simultaneously, reducing the processing overhead while maintaining individual pixel compensation accuracy.
Solution Approach 2:
The patent performs preliminary calculation and storage of pixel average current information in a look-up table before actual display operation. This pre-processing approach eliminates the need for complex real-time calculations during display operation, reducing device complexity while maintaining compensation accuracy.
3Loss of energy
If gamma information is compensated based on pixel average current, then luminous efficiency is maintained, but processing time and computational load increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating gamma compensation values and storing them in a look-up table based on pixel average current information. During actual display operation, the controller simply retrieves pre-computed compensation values rather than performing complex gamma calculations in real-time, significantly reducing processing time while maintaining luminous efficiency.
Data Source
AI summary
A method for controlling a display panel includes calculating an on-pixel ratio based on gamma information corresponding to image information, providing maximum current information based on a dimming level, calculating an average current of the display panel based on the on-pixel ratio and the maximum current information, and providing pixel average current information for each of a plurality of pixels in the display panel. The on-pixel ratio is based on the turned-on pixels of the pixels in the display panel. The pixel average current information is determined based on the average current of the display panel.