Stage Circuit Node-Voltage Control for Low-Power Display Drivers
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Solution Overview
Problem
Existing display devices face challenges in minimizing power consumption, particularly in the operation of scan drivers and emission drivers that drive pixels.
Innovation Solution
A stage circuit design incorporating an output unit, a first driver, and a second driver with specific transistor and capacitor configurations to control node voltages, optimizing power usage by setting enable signals and carry signals to specific voltage levels and utilizing transistors and capacitors to manage power flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional driver circuits are used to drive pixels in display devices, then the driving function is maintained, but power consumption is high
Solution Approach 1:
The driver circuit is divided into multiple stages, with each stage responsible for specific signal processing tasks. The output unit is separated into first and second output transistors that independently control different output signals (enable output signal and enable carry signal), allowing selective activation of circuit components to reduce overall power consumption while maintaining the complete driving function.
Solution Approach 2:
Different parts of the circuit are optimized with different transistor types and configurations based on their specific functional requirements. The first driver and second driver use different transistor arrangements (including control transistors and capacitors in specific configurations) to optimize local power consumption characteristics while ensuring the overall driving function remains reliable.
2Use of energy by moving object
If more transistors and capacitors are added to control node voltages, then power consumption is reduced, but device complexity increases
Solution Approach 1:
Multiple control transistors and capacitors are strategically combined in series and parallel configurations within the first driver and second driver. The control transistor and capacitor are merged into a unified control mechanism that manages node voltage transitions, reducing the need for separate control elements and simplifying the overall circuit structure while maintaining power efficiency.
Solution Approach 2:
The control transistors and capacitors are designed to perform multiple functions simultaneously. For example, the first capacitor serves both as a voltage storage element and as part of the control mechanism for the first transistor. The output transistors simultaneously drive different output signals while being controlled by the same node voltage management system, reducing the total number of components needed.
Data Source
AI summary
A stage circuit includes: an output unit connected to a first power input terminal and a second power input terminal, the output unit outputting an enable output signal to a first output terminal and an enable carry signal to a second output terminal; a first driver connected to the first power input terminal, the second power input terminal, a clock input terminal, and a second input terminal; and a second driver connected to a first input terminal, the second input terminal, the first power input terminal, and the clock input terminal, the second driver controlling a voltage of the first node. The second driver includes: a first transistor connected between the first node and the clock input terminal, the first transistor including a gate electrode connected to a control node; and a control transistor and a first capacitor, connected in series between the control node and the clock input terminal.