Electrostatic Protection Circuit for Display Panel Signal Lines
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Solution Overview
Problem
Display devices are vulnerable to damage from static electricity, which can cause sudden voltage and current changes in signal lines, leading to potential damage to the panel.
Innovation Solution
Incorporation of an electrostatic protection circuit between signal lines, comprising transistors, resistors, and capacitors, which are designed to turn on and manage static electricity by shifting threshold voltages and using resistors as fuses to prevent damage, ensuring the display panel operates safely during static events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrostatic protection circuit is added between signal lines, then the reliability of the display panel against static electricity damage is improved, but the device complexity increases
Solution Approach 1:
The patent introduces an electrostatic protection circuit as an intermediary component connected between signal lines (e.g., data lines). This protection circuit includes transistors, resistors, and capacitors that act as a mediator to dissipate static electricity and prevent direct damage to the display panel. The circuit is activated only when voltage differences exceed safe thresholds, maintaining normal operation during regular use while providing protection during static events.
2Reliability
If transistors with high threshold voltages are used in the protection circuit, then the protection against voltage spikes is improved, but the ease of operation during normal signal transmission may be affected
Solution Approach 1:
The patent employs transistors with specifically designed threshold voltages that are higher than the maximum voltage difference between signals during normal operation. This parameter selection ensures that the protection transistors remain in the off-state during normal signal transmission, allowing signals to pass through unaffected. When static electricity causes voltage spikes exceeding the threshold, the transistors switch to the on-state to provide protection, thus adapting their operation based on voltage conditions.
3Reliability
If multiple protection circuits are connected between signal lines, then the protection coverage is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent divides the protection system into multiple independent protection circuits, with each circuit connected between adjacent signal lines (e.g., between data line DL1 and DL2, between DL2 and DL3). This segmentation allows each protection circuit to be designed and manufactured using the same standardized process, simplifying fabrication. The modular structure enables independent optimization of each circuit while providing comprehensive coverage across all signal lines through systematic placement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The electrostatic protection circuit effectively minimizes the impact of static electricity on the display panel by managing voltage and current changes, preventing damage and ensuring normal operation.
Implementation Method 1
a first capacitor connected between the gate electrode of the first transistor and the second signal line, and a second capacitor connected between the lower gate electrode of the first transistor and the second signal line
Implementation Method 2
a first transistor connected between the first signal line and the second signal line and including a gate electrode and a lower gate electrode
Data Source
AI summary
A display panel includes an electrostatic protection circuit including a first protection circuit electrically connected between a first signal line and a second signal line. The first protection circuit includes a first transistor connected between the first signal line and the second signal line and including a gate electrode and a lower gate electrode, a first resistor connected between the gate electrode of the first transistor and the second signal line, a first capacitor connected between the gate electrode of the first transistor and the second signal line, and a second capacitor connected between the lower gate electrode of the first transistor and the second signal line. The lower gate electrode of the first transistor receives a reference voltage.