OLED Degradation Compensation via Power Current Sensing
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Solution Overview
Problem
Organic light emitting diodes (OLEDs) in display devices degrade over time, leading to reduced luminance and pixel degradation, which existing technologies have not effectively addressed.
Innovation Solution
A display device with a degradation compensator that calculates the degradation degree of pixels by measuring power current and calculates a compensation amount based on the degradation degree and image data, using a sensing circuit and compensation amount calculator to extend pixel lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If organic light emitting diodes are used in display devices, then display quality with wide viewing angle, rapid response speed, and low power consumption is achieved, but pixel degradation occurs over time leading to reduced luminance
Solution Approach 1:
The patent measures the power current flowing through the high power voltage line to calculate the degradation degree of pixels in advance, before significant luminance loss occurs. By performing preliminary degradation assessment, the system can calculate compensation amounts and adjust image data proactively, preventing severe pixel degradation and extending display device lifespan
Solution Approach 2:
The patent implements a feedback mechanism where the degradation compensator continuously monitors power current, calculates degradation degree, and adjusts image data accordingly. The timing controller receives degradation information and modifies subsequent image data to compensate for pixel degradation, creating a closed-loop system that maintains display quality over time
2Reliability
If degradation compensation is implemented by measuring power current, then pixel degradation can be calculated and compensated, but additional circuit components and control logic are required
Solution Approach 1:
The degradation compensator utilizes the existing high power voltage line that is already present in the display device for its normal power supply function. By measuring the power current flowing through this existing line, the system achieves degradation detection without requiring separate sensing circuits, thereby reducing overall device complexity while maintaining compensation capability
Solution Approach 2:
The patent combines the degradation measurement function with the existing power supply system by measuring current through the high power voltage line. This merging of functions allows the system to perform degradation assessment using infrastructure already in place, avoiding the need for additional dedicated measurement circuits and reducing system complexity
Data Source
AI summary
A display device includes: a display panel including a plurality of pixels; a power voltage generator to generate a high power voltage that is provided to the pixels through a high power line; a degradation compensator to calculate a degradation degree of the pixels by measuring a power current flowing through the high power voltage line, and to calculate a compensation amount of a degradation of the pixels based on the degradation degree of the pixels and image data provided to the pixels; a scan driver to provide scan signals to the pixels; a data driver to provide data signals to the pixels; and a timing controller to generate control signals to control the power voltage generator, the degradation compensator, the scan driver, and the data driver.