OLED Pixel Deterioration Compensation via Dynamic Sensing Voltage
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Solution Overview
Problem
Organic light emitting display devices face challenges in accurately compensating for pixel deterioration due to characteristic variations, leading to decreased display quality and afterimages, as existing sensing methods with fixed reference voltages may introduce errors in current variation sensing.
Innovation Solution
An organic light emitting display device with a controller that utilizes a modeling voltage map and modeling data to adjust sensing current variations, compensating input image data by deriving adjustment current variations based on the relationship between modeling voltages and current variation adjustment values, and incorporating stress data for improved compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed sensing reference voltage is applied to sense the sensing current, then the sensing process is simple, but error occurs in current variation sensing due to characteristic variation of pixels
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a fixed sensing reference voltage to a dynamically adjusted sensing reference voltage. The controller modifies the sensing reference voltage based on pixel characteristic variations (such as threshold voltage shifts and mobility changes) to maintain accurate current variation sensing. This dynamic adjustment ensures that the sensing operation remains precise despite pixel deterioration and characteristic variations over time.
2Device complexity
If pixel deterioration is not compensated, then the device structure remains simple, but display quality decreases and afterimage occurs
Solution Approach 1:
The patent implements feedback by sensing the actual current flowing through each pixel using a dynamically adjusted reference voltage, calculating the current variation, and using this information to compensate for pixel deterioration. The system continuously monitors pixel performance and adjusts the sensing parameters to maintain accurate compensation, thereby preventing display quality degradation and afterimage effects while managing the complexity through intelligent control algorithms.
3Measurement precision
If the sensing reference voltage is adjusted based on pixel characteristics, then current variation sensing accuracy improves, but the control system complexity increases
Solution Approach 1:
The patent applies parameter changes by adjusting the sensing reference voltage parameter based on detected pixel characteristic variations. Instead of redesigning the entire sensing system, the invention modifies the voltage parameter dynamically to compensate for threshold voltage shifts and mobility changes in pixels. This approach maintains high measurement precision while managing complexity through parameter optimization rather than structural redesign.
Data Source
AI summary
An organic light emitting display device includes a display panel including a plurality of pixels, a scan driver configured to provide a scan signal to the pixels, a data driver configured to provide a data signal to the pixels, a sensing circuit configured to sense a sensing current flowing through the pixels according to a sensing reference voltage applied to the pixels, and a controller configured to calculate a sensing current variation from the sensing current, and configured to adjust the sensing current variation based on a variation data of the pixels to compensate an input image data.