Electrostatic Discharging Circuit with Segmented Transistors
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Solution Overview
Problem
Display devices face signal leakage issues due to electrostatic discharging circuits using transistors with negative threshold voltages, which can lead to abnormal operation and ineffective electrostatic discharge.
Innovation Solution
The electrostatic discharging circuit includes a first transistor and a second transistor, both connected to a signal line and a node, with a capacitor receiving a voltage to compensate for threshold voltage variations, ensuring stable electrostatic discharge functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transistor with negative threshold voltage is used in the electrostatic discharging circuit, then the circuit can discharge static electricity, but signal leakage occurs during normal operation
Solution Approach 1:
The electrostatic discharging circuit is segmented into multiple transistors (first transistor, second transistor, third transistor) with different threshold voltage characteristics. Each transistor handles specific voltage ranges, allowing the circuit to discharge static electricity while preventing signal leakage during normal operation through coordinated operation of the segmented components.
Solution Approach 2:
Different transistors are assigned different threshold voltage characteristics (negative threshold voltage for the first transistor, positive threshold voltage for the second and third transistors) to perform different functions locally within the circuit. This local differentiation allows simultaneous achievement of electrostatic discharge capability and signal leakage prevention.
2Object-generated harmful factors
If a transistor with positive threshold voltage is used in the electrostatic discharging circuit, then signal leakage is reduced, but electrostatic discharge effectiveness decreases
Solution Approach 1:
The circuit segments the electrostatic discharge function across multiple transistors with different threshold characteristics. The first transistor with negative threshold voltage handles the initial high-voltage discharge, while the second and third transistors with positive threshold voltages manage subsequent discharge stages and prevent signal leakage, achieving both effectiveness and low leakage through segmentation.
Solution Approach 2:
The circuit changes the threshold voltage parameter across different transistor components rather than using a single transistor type. This parameter variation allows the circuit to adapt to different voltage levels during the discharge process, maintaining effectiveness while reducing leakage.
3Stability of the object's composition
If additional transistors and capacitors are added to compensate for threshold voltage shifts, then discharge stability improves, but device complexity increases
Solution Approach 1:
The electrostatic discharge and threshold voltage compensation functions are merged into a single integrated circuit structure. The first, second, and third transistors work together in a unified configuration where the compensation mechanism is built-in rather than added separately, reducing overall complexity while maintaining stability.
Solution Approach 2:
The multi-transistor configuration serves multiple functions simultaneously: the first transistor provides electrostatic discharge capability, while the second and third transistors provide threshold voltage compensation and signal leakage prevention. This multi-functionality reduces the need for separate compensation circuits, managing complexity.
Data Source
AI summary
An electrostatic discharging circuit includes a first transistor including a first electrode electrically connected to a signal line, a second electrode receiving a first voltage, and a first gate electrode electrically connected to a first node. A second transistor includes a third electrode electrically connected to the signal line, a fourth electrode electrically connected to the first node, and a second gate electrode electrically connected to the first node. A first capacitor receives the first voltage and is electrically connected to the first node.