Organic Light Emitting Display Device Threshold Voltage Compensation
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Solution Overview
Problem
High-resolution organic light emitting display devices face challenges in adequately compensating for the threshold voltage of driving transistors, particularly in high-resolution panels, which affects the reliability of pixel operation.
Innovation Solution
The organic light emitting display device employs a method where the one-frame period is divided into four periods: initialization, threshold voltage compensation, voltage fixation, and image data storage and emission, utilizing a scan driver, a first power source driver, and a data driver to control the supply of scan signals, power sources, and data signals, with specific timing and voltage references to ensure reliable light emission and voltage storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the horizontal period is shortened to increase resolution, then the panel resolution is improved, but the threshold voltage compensation becomes insufficient
Solution Approach 1:
The frame period is segmented into multiple distinct time periods: initialization period (first period), threshold voltage compensation period (second period), voltage fixation period (third period), and image data storage and emission period (fourth period). This temporal segmentation allows each function to be performed with adequate time allocation, solving the contradiction between short horizontal period and sufficient compensation time.
Solution Approach 2:
The threshold voltage compensation is performed in advance during the second period before the image data storage and emission period. By performing the compensation action preliminarily, the system ensures that the driving transistor is properly compensated before actual pixel operation, resolving the time allocation conflict.
2Reliability
If multiple transistors and capacitors are added to improve threshold voltage compensation, then the compensation reliability is improved, but the device complexity increases
Solution Approach 1:
The patent employs dynamic control of power source supply through the first power source driver, which successively stops power supply to different regions during different time periods. This dynamic temporal control replaces the need for additional static hardware components, achieving reliable compensation without increasing structural complexity.
Solution Approach 2:
The system uses periodic action by dividing the frame period into repeating cycles with specific functions. The threshold voltage compensation occurs periodically in the second period, and this time-based periodic control mechanism achieves reliable compensation without requiring additional permanent circuit components.
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 approach allows for reliable compensation of threshold voltages and efficient light emission in high-resolution displays, enabling the device to be applied to high-resolution HMDs with improved pixel density and resolution.
Implementation Method 1
organic light emitting display device displays an image using an organic light emitting diode which emits light via re-coupling of electrons and holes
Data Source
AI summary
Provided herein may be an organic light emitting display device including: pixels coupled both to power source lines and scan lines that are formed on respective horizontal lines, and to data lines formed on respective vertical lines; a scan driver configured to supply scan signals to the scan lines; a first power source driver configured to supply first power sources to the power source lines; and a data driver configured to supply data signals to the data lines. The first power source driver may control light emitting operations of the pixels by successively stopping the supply of the first power sources to the power source lines.