Display ESD Circuit With Overlapping Transistors for Voltage Clamping
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Solution Overview
Problem
Static electricity introduced into display apparatuses can cause malfunction or damage to internal circuits, particularly affecting transistors.
Innovation Solution
An electrostatic discharge circuit is implemented with specific transistor configurations to manage voltage levels, ensuring protection against static electricity by turning on transistors based on voltage thresholds, thereby maintaining signal line voltage within defined gate power voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If transistors are used to control signal lines in display apparatuses, then the display can operate with low voltage and consume less power, but the internal circuits become vulnerable to damage from static electricity
Solution Approach 1:
The patent introduces a dedicated electrostatic discharge circuit as an intermediary component between the signal line and ground. This circuit includes electrostatic discharge transistors that remain normally off but activate when static electricity exceeds a threshold voltage, safely channeling the excess charge to ground without affecting normal low-voltage operation. This mediator structure allows the display to maintain low power consumption while gaining protection against static electricity damage.
2Reliability
If electrostatic discharge protection circuits are added to protect against static electricity, then circuit reliability improves, but the device complexity increases
Solution Approach 1:
The patent merges the electrostatic discharge protection function with the existing transistor-based signal line structure. The electrostatic discharge transistors are integrated alongside the driving transistors sharing common signal lines and gate power voltage lines. By combining protection functions with existing circuit elements rather than adding completely separate protection circuits, the patent achieves reliable static electricity protection while minimizing increases in overall device complexity.
3Manufacturing precision
If multiple transistors are disposed to overlap each other between signal lines and gate power voltage lines, then voltage control precision improves, but manufacturing difficulty increases
Solution Approach 1:
The patent utilizes vertical stacking and overlapping arrangement of transistors in the third dimension rather than only horizontal placement. Multiple transistors are disposed to overlap each other between the signal line and gate power voltage lines, creating a layered structure. This dimensional approach allows precise voltage control through multiple transistor stages while efficiently utilizing the available space, thereby reducing the impact on manufacturing processes compared to purely planar expansions.
Data Source
AI summary
An electrostatic discharge circuit and a display apparatus are discussed. The electrostatic discharge circuit can include a signal line configured to transmit a gate signal or a data signal, a first gate power voltage line, a second gate power voltage line, a first transistor and a second transistor disposed to overlap each other between the signal line and the second power voltage line, and a third transistor and a fourth transistor disposed to overlap each other between the signal line and the first power voltage line.