Pixel Circuit Compensation for IR Drop and Threshold Voltage
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Solution Overview
Problem
Conventional pixel circuits require complex structures to compensate for threshold voltage and IR drop, leading to unstable circuit performance.
Innovation Solution
A pixel circuit comprising a storage capacitor unit, a driving transistor, a compensation unit, a switching unit, and a current supply unit, which allows for controlled electrical connections/disconnections to compensate for IR drop and threshold voltage, enabling stable operation and simplifying the circuit structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pixel circuit uses a large amount of transistors to compensate for threshold voltage and IR drop, then compensation performance is improved, but circuit structure complexity increases
Solution Approach 1:
The pixel circuit is divided into distinct functional units: a compensation unit with first and second compensation transistors for threshold voltage compensation, and a storage capacitor for charge storage. This segmentation allows each unit to perform its specific compensation function independently, achieving reliable compensation while maintaining a manageable circuit structure with a limited number of transistors.
2Reliability
If a pixel circuit uses current compensation technology to compensate for threshold voltage and IR drop, then compensation capability is improved, but circuit structure becomes complex and performance becomes unstable
Solution Approach 1:
The compensation transistors are configured to create feedback mechanisms where the gate electrodes are connected to drain electrodes, forming self-regulating loops. This feedback structure automatically adjusts the transistor operation to compensate for threshold voltage variations and IR drop effects, improving compensation capability while maintaining circuit stability and simplicity.
3Ease of operation
If a pixel circuit uses voltage compensation technology, then operation is simplified, but inability to compensate for IR drop occurs
Solution Approach 1:
The invention changes the operating parameters of the compensation transistors by configuring their gate and drain connections in specific ways. The first compensation transistor has its gate connected to the gate of the driving transistor, while the second compensation transistor has its gate connected to its drain, creating different voltage conditions that enable simultaneous compensation for both threshold voltage and IR drop effects.
Data Source
AI summary
A pixel circuit includes a storage capacitor unit, a driving transistor, a compensation unit, a switching unit, a light-emitting element and a current supply unit. The compensation unit is connected to a compensation control end, a gate electrode and a second electrode of the driving transistor, and the current supply unit, and configured to, under the control of the compensation control end, control the current supply unit to be electrically connected to, or electrically disconnected from, the gate electrode, and control the gate electrode to be electrically connected to, or electrically disconnected from, the second electrode. The switching unit is connected to a light-emitting control end, the second electrode, and a first end of the light-emitting element, and configured to control the second electrode to be electrically connected to, or electrically disconnected from, the first end of the light-emitting element under the control of the light-emitting control end.