OLED Display Sensing Circuit for Degradation Compensation
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Solution Overview
Problem
Light emitting display apparatuses face limitations due to degradation in organic light emitting diodes, which affects their performance and efficiency, particularly in maintaining consistent emission efficiency over time.
Innovation Solution
A sensing circuit unit is integrated into the display apparatus to detect and compensate for organic light emitting diode degradation by sensing feedback voltage stability, using a voltage follower and analog-to-digital conversion to calculate averaged sensing values and trigger compensation operations based on reference values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous sensing of feedback voltage is performed to accurately detect OLED degradation, then measurement precision is improved, but device complexity increases due to additional sensing circuits and control mechanisms
Solution Approach 1:
The system performs preliminary sensing of the feedback voltage during the electrically stable period before degradation becomes significant. By detecting voltage variations early in the stable period, the system can identify OLED degradation trends before they affect display performance, enabling preventive compensation rather than reactive correction.
Solution Approach 2:
The sensing circuit continuously monitors the feedback voltage from the power supply and feeds this information back to the timing controller. The timing controller then adjusts the driving signals to compensate for detected OLED degradation, creating a closed-loop system that maintains display quality despite component aging.
2Productivity
If sensing is performed during electrically unstable period to improve productivity, then measurement speed is improved, but measurement precision deteriorates due to electrical instability affecting voltage readings
Solution Approach 1:
The feedback voltage sensing is segmented into different time periods within each driving cycle. The system identifies and selectively senses the feedback voltage only during the electrically stable period, excluding the unstable period from sensing operations. This temporal segmentation ensures accurate measurements without sacrificing overall system productivity.
Solution Approach 2:
The sensing operation is performed periodically at specific intervals within the driving cycle, specifically during the electrically stable period. This periodic sensing approach ensures that measurements are taken when voltage readings are reliable, while the timing controller coordinates multiple sensing operations to maintain continuous monitoring without overwhelming the system.
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 solution enhances the accuracy of detecting organic light emitting diode degradation and enables effective compensation, thereby maintaining the display's performance and efficiency by selectively sensing and addressing electrical stability periods.
Implementation Method 1
Based on a voltage follower where an input impedance thereof is large, the sensing circuit unit may sense an analog feedback voltage
Implementation Method 2
convert the analog feedback voltage into a digital sensing value
Data Source
AI summary
The present disclosure provides a light emitting display apparatus including a display panel displaying an image, a power supply supplying a driving voltage to the display panel, a data driver supplying a data voltage to the display panel, a timing controller controlling the power supply and the data driver, and a sensing circuit unit receiving a feedback component of the driving voltage as a feedback voltage and selectively sensing an electrically stabilized period in the feedback voltage based on an internal control signal of the power supply.