Pixel Circuit Coupling Control for Lower Voltage Span
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Solution Overview
Problem
The complexity of external power signals in existing LED display panel pixel circuits results in a large voltage span, reducing the reliability of the pixel circuit.
Innovation Solution
A pixel circuit design incorporating a light emission time control circuit, current control circuit, and light emission circuit, where a first data voltage is written to a control terminal of a first drive circuit indirectly through a coupling circuit, allowing the on state of the first drive circuit to be controlled without setting it according to the magnitude of the data voltage, thereby reducing the voltage span and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external power signals are made complex to control various transistors according to data signals, then the transistors can be turned on and off normally, but the voltage span of the pixel voltage becomes large, reducing reliability
Solution Approach 1:
A coupling circuit is introduced as an intermediary between the data voltage input and the first drive circuit control terminal. This coupling circuit decouples the direct relationship between data voltage magnitude and drive circuit control, allowing the drive circuit to be controlled without direct dependence on data voltage levels. The coupling circuit acts as a mediator that transfers control signals while isolating the voltage span requirements, thereby reducing the overall voltage span needed in the pixel circuit while maintaining proper transistor switching functionality.
2Ease of operation
If data voltage is directly applied to control terminal of first drive circuit, then control is simple, but the on state must be set according to data voltage magnitude, increasing voltage span requirements
Solution Approach 1:
The coupling circuit serves as an intermediary that receives data voltage and transforms it into a suitable control signal for the first drive circuit. Instead of directly applying data voltage to the control terminal, the coupling circuit processes the signal, allowing the drive circuit to be controlled without direct dependence on data voltage magnitude. This maintains ease of operation while reducing voltage span requirements.
Solution Approach 2:
The control signal path is segmented into separate stages: the coupling circuit stage that handles data voltage input, and the first drive circuit stage that executes the control function. This segmentation allows each stage to be optimized independently - the coupling circuit handles voltage transformation while the drive circuit focuses on transistor control, thereby reducing the overall voltage span requirements while maintaining control simplicity.
Data Source
AI summary
A pixel circuit, a driving method thereof, and a display device. The pixel circuit includes a light emission time control circuit, a current control circuit, and a light emission circuit. The light emission time control circuit includes a first drive circuit, a coupling circuit, and a first voltage write circuit. The first voltage write circuit is configured to transmit a fixed voltage to a control terminal of the first drive circuit. The coupling circuit is connected to the control terminal of the first drive circuit. A first terminal of the first drive circuit outputs a control voltage to a control terminal of the current control circuit. An output of the current control circuit is connected to the light emission circuit.