OLED Pixel Deterioration Compensation via Dynamic LUT Updates
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Solution Overview
Problem
Organic light emitting display devices face challenges in accurately compensating for pixel deterioration over time, leading to decreased luminance and display quality due to limited resources such as register capacity and memory, resulting in incorrect compensation and limited lifespan.
Innovation Solution
An organic light emitting display device with a controller that accumulatively stores deterioration data in a lifespan register, updates an efficiency changing region and look-up table based on accumulated driving time, and converts input image data into output data using the updated efficiency values to compensate for pixel degradation, thereby extending the lifespan and maintaining display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional compensation methods are used with fixed register capacity and memory, then device complexity is reduced, but manufacturing precision deteriorates due to incorrect compensation in early deterioration period
Solution Approach 1:
The patent implements dynamic updating of the efficiency changing period and look-up table based on accumulated driving time. The controller automatically adjusts the efficiency changing period to be shorter in early deterioration stages and longer in later stages, allowing precise compensation throughout the device lifespan without requiring excessive memory capacity. This dynamic adaptation resolves the contradiction by making the compensation system flexible rather than static.
Solution Approach 2:
The patent changes the parameter of efficiency changing period over time. By updating the efficiency changing period and look-up table based on accumulated driving time, the system adapts its compensation parameters to match the deterioration stage, achieving high precision compensation without requiring large register capacity for storing multiple fixed compensation tables.
2Reliability
If fixed efficiency changing period is used, then device complexity is reduced, but reliability deteriorates due to limited life guaranteed time
Solution Approach 1:
The patent performs preliminary updates of the efficiency changing period and look-up table based on predicted accumulated driving time. By proactively updating compensation parameters before deterioration becomes severe, the system extends the guaranteed life time while maintaining manageable device complexity through automated timing mechanisms.
Solution Approach 2:
The patent implements a feedback mechanism where the controller monitors accumulated driving time and automatically updates the efficiency changing period and look-up table accordingly. This closed-loop feedback system ensures continuous accurate compensation throughout the device lifespan, extending reliable operation without requiring complex manual intervention.
3Manufacturing precision
If frequent updates of look-up table are performed, then manufacturing precision is improved, but use of energy increases
Solution Approach 1:
The patent implements periodic updates of the look-up table based on accumulated driving time thresholds. Instead of continuous updating, the system updates compensation parameters at specific intervals corresponding to deterioration stages, achieving accurate compensation while minimizing energy consumption associated with frequent memory operations.
Data Source
AI summary
An display device includes a display panel including a plurality of pixels; a scan driver configured to provide scan signals to the pixels; a data driver configured to provide data signals to the pixels; a look-up table (LUT), wherein an efficiency curve indicating a relationship between an accumulated driving time and an efficiency value is stored in the LUT; a lifespan register, wherein an efficiency changing region for deriving the efficiency value of each of the pixels from the LUT is stored in the lifespan register and the lifespan register is configured to accumulatively store deterioration data of the pixels; and a controller configured to derive the accumulated driving time from the lifespan register, to update the efficiency changing region and the LUT based on the accumulated driving time, and to convert input image data into output image data using the efficiency changing region and the LUT.