Dual-Gate Pixel Circuit Threshold Voltage Regulation
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Solution Overview
Problem
The stability of signal output by the pixel circuit in display panels is affected by the threshold voltage drift of the drive transistor, leading to poor threshold compensation and degraded picture quality.
Innovation Solution
A pixel circuit with a dual-gate drive transistor and a threshold voltage regulation module that separately writes preset voltages into the first and second gates to actively regulate the threshold voltage, suppressing drift and improving compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional drive transistor is used in the pixel circuit, then the device complexity is low, but the threshold voltage drift occurs leading to poor threshold compensation effect
Solution Approach 1:
The drive transistor is divided into a dual-gate transistor structure with a first gate and a second gate, where the first gate receives a first voltage and the second gate receives a second voltage. This segmentation allows independent control of threshold voltage through the second gate while maintaining drive functionality through the first gate, thereby improving threshold compensation effect without significantly increasing overall device complexity
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the voltage at the second gate to compensate for threshold voltage drift. The threshold voltage regulation module changes the electrical parameter (voltage) at the second gate based on detected threshold voltage variations, enabling active suppression of threshold drift and improvement of compensation effect
2Reliability
If passive compensation method is used, then the device complexity is low, but the threshold voltage drift is not suppressed effectively
Solution Approach 1:
The patent implements a feedback mechanism where a threshold voltage regulation module continuously monitors the threshold voltage of the drive transistor and dynamically adjusts the voltage at the second gate to compensate for drift. This feedback loop actively suppresses threshold voltage instability, improving reliability despite the increased complexity of the regulation module
Solution Approach 2:
The threshold voltage regulation module performs preliminary action by proactively adjusting the threshold voltage before significant drift occurs. By continuously regulating the voltage at the second gate in advance, the system prevents threshold voltage instability rather than merely reacting to it, thereby improving reliability
Data Source
AI summary
The present application discloses a pixel circuit and method for driving the same, and a display panel. The pixel circuit includes a drive module, where the drive module includes a drive transistor. The drive transistor is a dual-gate transistor and includes a first gate and a second gate. The drive transistor is configured to regulate a threshold voltage of the drive transistor in response to a voltage at the second gate, and generate a driving current in response to a voltage at the first gate. The pixel circuit further includes a threshold voltage regulation module electrically connected to the drive module. The threshold voltage regulation module is configured to separately write a preset voltage into the first gate and the second gate, and regulate the threshold voltage of the drive transistor to a preset threshold voltage.