Display Driving Circuit Layout for Accurate Transistor Turn-Off
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Solution Overview
Problem
Existing driving circuits face issues with transistor drift, leading to incorrect transistor turn-off and current leakage due to mismatched transistor characteristics.
Innovation Solution
The driving circuit includes an output circuit and a first control circuit, with different voltage signals applied to the first and second voltage lines to control transistor turn-off, and additional control circuits to manage node potentials, ensuring accurate transistor switching without leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transistor characteristics drift, then the transistor cannot be turned off correctly, but increasing the width-to-length ratio improves current drive capability
Solution Approach 1:
The patent applies parameter changes by adjusting the width-to-length ratio of the output transistor to a specific range (34-45) to optimize both current drive capability and turn-off accuracy. This parameter optimization resolves the contradiction by finding the optimal balance point where the transistor maintains sufficient current drive while being less susceptible to drift-induced turn-off failures.
2Power
If the output transistor has a large width-to-length ratio, then current drive capability is improved, but layout space is increased
Solution Approach 1:
The patent optimizes the width-to-length ratio parameter to a specific range (34-45) that balances current drive capability with layout space requirements. This parameter optimization allows the circuit to achieve sufficient power output while minimizing the area occupied by the output transistor in the layout.
Data Source
AI summary
A includes an output circuit and a first control circuit; the output circuit controls to connect or disconnect the driving signal terminal and the first voltage lines under the control of a potential of the first node; the first control circuit controls to connect or disconnect the first node and the second voltage line under the control of a potential of the second node; a potential of the first voltage signal is different from a potential of the second voltage signal.