Driving Transistor Threshold Voltage Detection with Signal Adjustment
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Solution Overview
Problem
The accuracy of detected threshold voltages for driving transistors in display panels is affected by voltage drift, causing inaccuracies in brightness compensation due to source voltage exceeding the detection range of analog-to-digital converters.
Innovation Solution
A method and device that detect first-electrode voltages of driving transistors when they are in a turn-off state, adjust data and reference signals to bring the first-electrode voltage within a preset range, and determine the threshold voltage accordingly, ensuring accuracy by dynamic adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the source voltage is adjusted to compensate for threshold voltage drift, then the brightness uniformity is improved, but the source voltage may exceed the detection range of the analog-to-digital converter, causing measurement inaccuracy
Solution Approach 1:
The patent applies dynamics by making the data signal and reference signal adjustable rather than fixed. The control module dynamically adjusts the amplitude of these signals based on the detected first-electrode voltage to ensure the voltage difference falls within the preset range, allowing the system to adapt to different threshold voltage drift conditions while maintaining measurement accuracy
Solution Approach 2:
The patent changes the parameters (amplitude of data signal and reference signal) to optimize the detection process. By adjusting these signal parameters, the system ensures that the voltage difference between gate electrode and first electrode remains within the detectable range of the analog-to-digital converter, thereby maintaining measurement precision across varying operating conditions
2Device complexity
If fixed data signal and reference signal are applied to driving transistors, then the detection process is simple, but the detected threshold voltage accuracy decreases when source voltage drifts
Solution Approach 1:
The patent implements feedback by using the detected first-electrode voltage to control the adjustment of data signal and reference signal. The control module continuously monitors the voltage difference and adjusts the signal amplitudes accordingly, creating a closed-loop system that maintains measurement accuracy without requiring complex manual intervention
Solution Approach 2:
The system performs self-adjustment by automatically modifying the data signal and reference signal based on the detected voltage conditions. This self-service mechanism eliminates the need for external calibration or manual intervention, maintaining both simplicity and accuracy
Data Source
AI summary
A detecting method and device for detecting threshold voltages of driving transistors. The detecting method includes: loading data signals and reference signals on respective driving transistors in a detection group; when the respective driving transistors are in a turn-off state, detecting first-electrode voltages of the respective driving transistors; and determining a target adjustment set in the detection group according to the first-electrode voltages of the respective driving transistors and a preset voltage range. For each target driving transistor in the target adjustment set, the detecting method further includes: adjusting at least one of a data signal and a reference signal loaded on the target driving transistor; when the target driving transistor is in the turn-off state, detecting a first-electrode target voltage of the target driving transistor; and determining a threshold voltage of the target driving transistor according to the first-electrode target voltage of the target driving transistor.