OLED Degradation Compensation via Accumulated Image Data
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Solution Overview
Problem
Organic light-emitting display devices face luminance deterioration and irregularity due to the degradation of organic light-emitting diodes (OLEDs) over time, leading to decreased efficiency and uniformity in picture quality.
Innovation Solution
An organic light-emitting display device with a controller that accumulates image data and generates compensated image data using a degradation compensation method, which includes sensing data to determine the degree of OLED degradation, switching between first and second compensation methods based on reference data, and calculating a final compensation amount to adjust data voltage for each pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If OLEDs are used for display, then fast response speed and low power consumption are achieved, but luminance deteriorates and becomes irregular over time due to organic material degradation
Solution Approach 1:
The patent implements a feedback mechanism where the controller accumulates image data over multiple frames, determines OLED degradation based on this accumulated data, and generates compensated image data to correct for degradation. This closed-loop feedback system continuously monitors and adjusts for luminance deterioration, maintaining uniformity despite organic material degradation over time.
Solution Approach 2:
The patent applies preliminary compensation by calculating degradation compensation values based on accumulated image data before displaying the image. The controller proactively adjusts the image data to preemptively counteract expected luminance deterioration, rather than reacting after degradation occurs.
2Reliability
If degradation compensation is performed, then luminance uniformity is improved, but device complexity increases due to multiple compensation methods and accumulation mechanisms
Solution Approach 1:
The patent employs dynamic compensation by switching between different compensation methods based on the amount of accumulated image data. When accumulation reaches a threshold, the system transitions from using only accumulated data to incorporating sensor data, creating a dynamic, adaptive compensation system that optimizes reliability while managing complexity through conditional logic.
Solution Approach 2:
The patent changes the parameter of compensation data source based on accumulation status. The controller monitors the amount of accumulated image data and adjusts the compensation approach accordingly—using accumulated data alone initially, then transitioning to include sensor data when thresholds are met, thereby managing system complexity through parameter-based adaptation.
3Measurement precision
If sensor data is used for degradation sensing, then measurement precision is improved, but device complexity and cost increase due to additional sensing components
Solution Approach 1:
The patent implements partial sensing by using sensor data selectively rather than continuously. The controller determines whether to activate sensor-based degradation sensing based on the amount of accumulated image data, applying sensing only when necessary to maintain measurement precision while avoiding the continuous overhead of full sensing operation.
Solution Approach 2:
The patent makes the controller multi-functional by enabling it to perform both image processing and degradation sensing functions. The controller can operate in modes using either accumulated image data alone or in combination with sensor data, allowing a single component to fulfill multiple roles and reducing the need for separate dedicated sensing circuitry.
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 allows for precise degradation information collection and compensation, reducing luminance deterioration and irregularity, thereby improving the display quality and extending the lifespan of OLEDs.
Implementation Method 1
Organic light-emitting display devices display an image by using organic light-emitting diodes (OLEDs), which generate light through the recombination of electrons and holes
Data Source
AI summary
An organic light-emitting display device, including a display unit including a plurality of pixels each having an organic light-emitting diode (OLED), a controller configured to accumulate image data of each frame and to generate compensated image data using a degradation compensation method determined, based on the accumulated image data, to compensate for the degradation of the OLED of each of the pixels, and a data driver configured to generate a data voltage according to the compensated image data and to provide the data voltage to the pixels.