Pixel Circuit With Distributed Capacitor for Stable Driving Current
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Solution Overview
Problem
The threshold voltage drift of driving transistors in pixel circuits affects the stability of driving current, leading to poor display effects in light-emitting devices such as OLEDs, QLEDs, Micro LEDs, and Mini LEDs.
Innovation Solution
A pixel circuit design that includes a distributed capacitor to compensate the threshold voltage of driving transistors, combined with initialization, data compensation, and light-emitting control circuits, to stabilize the driving current and improve display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel circuit without distributed capacitor is used, then the device complexity is low, but the threshold voltage drift affects driving current stability
Solution Approach 1:
The pixel circuit is divided into multiple functional modules: initialization circuit, data compensation circuit, light-emitting control circuit, and distributed capacitor. Each module performs a specific function to collectively solve the threshold voltage drift problem while maintaining manageable complexity through modular design.
Solution Approach 2:
The initialization circuit performs preliminary voltage initialization on the driving transistor gate before the light-emitting operation. This preliminary action sets the transistor to a known state, preventing threshold voltage drift from affecting subsequent driving current stability.
2Reliability
If threshold voltage compensation is implemented, then the driving current stability is improved, but the circuit complexity increases
Solution Approach 1:
The data compensation circuit implements feedback by sensing the threshold voltage of the driving transistor and automatically adjusting the gate voltage to compensate for drift. This closed-loop feedback mechanism maintains threshold voltage stability without requiring manual intervention or complex external control systems.
Solution Approach 2:
The distributed capacitor acts as an intermediary element that stores charge and maintains the gate voltage of the driving transistor. It mediates between the compensation circuit and the transistor, providing stable voltage storage and reducing the direct complexity of the compensation mechanism.
3Manufacturing precision
If multiple control circuits are added to stabilize driving current, then the display quality is improved, but the manufacturing complexity increases
Solution Approach 1:
Multiple control functions (initialization, data compensation, light-emitting control) are merged into a single integrated pixel circuit structure. All control circuits share common signal lines and are fabricated using the same semiconductor process, reducing manufacturing complexity while maintaining high display quality through coordinated operation of the merged functions.
Data Source
AI summary
Provided are a pixel circuit, a driving method and a display apparatus. The pixel circuit includes: a light-emitting device (L); a driving transistor (M0) coupled to the light-emitting device and configured to generate, according to a data voltage, a driving current for driving the light-emitting device to emit light; a distributed capacitor (C1), a first electrode of the distributed capacitor being coupled to a gate of the driving transistor, and a second electrode of the distributed capacitor bring coupled to a first electrode of the driving transistor; an initialization circuit (10) configured to initialize the gate of the driving transistor under control of a signal of a reset signal end (Re); a data compensation circuit (20) configured to input the data voltage under control of a signal of a scanning signal end (Sn) and compensate for a threshold voltage (Vth) of the driving transistor; and a light-emitting control circuit (30).