OLED Pixel Circuit Threshold Voltage Detection During Active Display
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Solution Overview
Problem
Current threshold voltage detection methods for OLED display panels are typically performed during shutdown periods, preventing real-time monitoring and compensation, which leads to decreased luminance uniformity and compensation effectiveness.
Innovation Solution
A detection method for a pixel circuit that applies data and setting voltages to a driving transistor to set it in a saturation region, allowing for the determination of threshold voltage through a sensing line during active display periods, thereby reducing detection time and enabling real-time compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If threshold voltage detection is performed during shutdown periods, then detection can be completed with existing circuit structures, but real-time monitoring and compensation are prevented, leading to decreased luminance uniformity
Solution Approach 1:
The patent applies preliminary action by performing threshold voltage detection during active display periods rather than waiting for shutdown periods. The detection operation is initiated while the display is actively running, allowing threshold voltage values to be obtained in real-time during normal operation, which enables immediate compensation and maintains luminance uniformity without requiring shutdown time.
2Productivity
If detection operations are performed during active display periods, then real-time compensation is enabled, but additional time requirements are imposed on the display system
Solution Approach 1:
The patent implements periodic action by integrating threshold voltage detection operations into the existing display refresh cycle. The detection is performed periodically during active display periods at predetermined time points within each frame period, allowing the system to maintain real-time compensation effectiveness while operating within the constraints of the display's existing timing structure and refresh rate.
3Measurement precision
If multiple detection operations are performed with different data voltages, then detection accuracy is improved, but detection time and operational complexity increase
Solution Approach 1:
The patent applies partial action by performing a limited number of detection operations (first and second detection operations) with different data voltages during the active display period. This provides sufficient detection accuracy to determine the threshold voltage while avoiding excessive detection operations that would unnecessarily increase time consumption and operational complexity. The method strikes an optimal balance between accuracy and efficiency.
Data Source
AI summary
A detection method for a pixel circuit, a driving method for a display panel and a display panel are disclosed. The pixel circuit includes a driving transistor including a gate electrode, and a first terminal connected to a sensing line. The detection method includes: applying a data voltage and a setting voltage to the driving transistor so as to obtain a sensed voltage and obtaining a threshold voltage of the driving transistor based on the data voltage, the setting voltage and the sensed voltage. The data voltage and the setting voltage are respectively applied to the gate electrode and the first terminal so as to set the driving transistor to be in a saturation region, the gate electrode is set to be in a suspension state when the driving transistor is maintained in the saturation region, and the sensed voltage is obtained after a pre-determined time period.