Light Emitting Device Driving Circuit Threshold Voltage Compensation
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Solution Overview
Problem
Existing light emitting driving circuits struggle to compensate for the threshold voltage of the driving transistor, leading to instability in display panels and increased power consumption.
Innovation Solution
A light emitting device driving circuit is designed with a compensation module comprising transistors and a storage capacitor, which compensates for the threshold voltage of the driving transistor, improving stability and reducing power consumption by resetting and controlling the voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active driving is adopted with compensation circuit design, then threshold voltage compensation is achieved, but device complexity and timing complexity increase
Solution Approach 1:
The pixel circuit is divided into distinct functional modules: a reset module with a reset transistor, a compensation module with first and second compensation transistors, a data writing module, and a light emitting control module. Each module performs a specific function independently, making the overall complex circuit manageable and easier to design and analyze while achieving threshold voltage compensation through the coordinated operation of these segmented components
Solution Approach 2:
The compensation operation is performed in advance during a dedicated compensation phase before the light emitting phase. The first compensation transistor and second compensation transistor are activated during this preliminary phase to establish the correct gate voltage for the driving transistor, ensuring that threshold voltage compensation is completed before the actual light emitting operation begins, thus improving display stability without affecting the light emitting performance
2Reliability
If more scan signals and control signals are used for compensation, then threshold voltage compensation is achieved, but timing complexity and operation complexity increase
Solution Approach 1:
The circuit operation is divided into distinct periodic phases: a reset phase where the reset transistor is activated, a compensation phase where the compensation transistors are activated, a data writing phase, and a light emitting phase. Each phase uses specific control signals that are activated only during their designated time window, making the timing control systematic and manageable while achieving effective threshold voltage compensation through this periodic operation pattern
Data Source
AI summary
A light emitting device driving circuit and a display panel both include a light emitting device, a driving transistor, a data signal write module, a light emitting control module, a reset module, a compensation module, and a storage capacitor. A threshold voltage of the driving transistor can be compensated by the compensation module, and a first node can be reset by the reset module. This can solve the technical problem that the existing light emitting drive circuit cannot compensate for the threshold voltage of the driving transistor.