Rollable OLED Display Burn-In Prediction and Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rollable displays using OLEDs suffer from burn-in phenomena due to cumulative light emitting time, leading to afterimages or stains on the screen, which existing technologies fail to effectively predict and compensate for.
Innovation Solution
An electronic device with a rollable display that includes a housing, memory, and a processor to store and analyze burn-in information, predict burn-in occurrences, and generate compensation maps to adjust image data, thereby reducing defects from afterimages and stains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If OLED is used in rollable display to enable flexible form factors, then adaptability and device functionality are improved, but burn-in phenomenon occurs due to cumulative light emitting time
Solution Approach 1:
The system performs preliminary burn-in prediction by analyzing cumulative light emitting time data before actual burn-in occurs. The processor calculates predicted burn-in values based on historical driving data and generates compensation maps in advance to prevent afterimage formation, rather than waiting for the problem to manifest.
Solution Approach 2:
The system applies preliminary countermeasures by generating compensation maps that offset predicted burn-in effects before they become visible. The compensation data adjusts pixel driving signals proactively to counteract the cumulative degradation effect, preventing the harmful afterimage phenomenon from occurring.
2Reliability
If burn-in compensation is implemented for the entire display area, then display quality is improved, but processing time and computational resources increase
Solution Approach 1:
The display area is divided into multiple regions: a first area that is fixedly exposed and a second area that is variably exposed. The system generates different compensation maps for different regions (first compensation map for boundary area, second compensation map for remaining area), allowing selective processing rather than uniform compensation across the entire display.
Solution Approach 2:
The system applies different compensation strategies to different regions based on their specific characteristics. The boundary area between fixed and variable regions receives local compensation tailored to its unique burn-in patterns, while other areas receive appropriate compensation levels, optimizing processing efficiency while maintaining display quality.
3Manufacturing precision
If separate compensation maps are generated for boundary area and remaining area, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The system segments the display into a boundary area (containing m block areas) and a remaining area (containing n block areas), generating separate compensation maps for each region. This segmentation allows precise compensation for the boundary area which has different burn-in characteristics due to its location between fixed and variable display regions.
Solution Approach 2:
The system dynamically selects which compensation map to apply based on the current display state. The processor determines whether to use the first compensation map (for boundary area burn-in) or the second compensation map (for remaining area burn-in) based on real-time analysis, making the system adaptable rather than statically complex.
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 solution effectively predicts and compensates for burn-in in rollable displays, reducing afterimages and stains on the screen by adjusting image data based on analyzed burn-in information, improving display longevity and user experience.
Implementation Method 1
pixels of the display panel may include the OLED
Data Source
AI summary
An electronic device with a rollable display may include the operations of: obtaining global burn-in information and local burn-in information according to a designated sampling period; on the basis of the result of analyzing the global burn-in information, predicting whether burn-in will at least partially occur in the entire area of a display area; when burn-in is predicted to at least partially occur in a boundary area, generating a first compensation map including pieces of local compensation data calculated to correspond to m block areas of the boundary area, respectively; when burn-in is predicted to at least partially occur in an area remaining after excluding the boundary area from the entire area, generating a second compensation map including pieces of global compensation data calculated to correspond to n block areas of the entire area, respectively; and controlling the rollable display to display image data compensated on the basis of the first compensation map or the second compensation map.