Static Electricity Protection Circuit for Electro-Optical Apparatus
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Solution Overview
Problem
Existing liquid crystal apparatuses face challenges in effectively discharging static electricity, leading to potential irreparable damage to transistors connected with high potential and low potential wirings, as existing static electricity protection circuits struggle to manage electrical charges effectively.
Innovation Solution
A static electricity protection circuit is designed with multiple transistors and power wirings, where each transistor is connected to either the signal wiring or power wirings, allowing for the discharge of electrical charges to either the first or second power wiring, thereby distributing the charge and reducing the risk of damage to transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a static electricity protection circuit with single high potential wiring and single low potential wiring is used, then the circuit structure is simple, but the transistors connected to these wirings are vulnerable to electrostatic damage when charges are applied
Solution Approach 1:
The patent divides the single high potential wiring into multiple high potential wirings and the single low potential wiring into multiple low potential wirings. This segmentation allows the static electricity protection circuit to distribute electrical charges across multiple transistors and wirings, preventing any single transistor from bearing the full electrostatic stress and thereby improving reliability without significantly increasing overall system complexity.
2Reliability
If electrical charge due to static electricity is applied to high potential wiring or low potential wiring, then the potential of these wirings changes, but existing protection circuits cannot discharge the charge effectively causing transistor damage
Solution Approach 1:
The patent introduces additional transistors as intermediary components between the high potential wirings and low potential wirings. These intermediary transistors provide alternative discharge paths for static electricity charges, allowing the charges to be safely redirected and dissipated through controlled conduction rather than causing direct damage to the primary transistors connected to the power wirings.
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 solution effectively suppresses the influence of static electricity on both signal and power wirings, reducing the risk of electrostatic damage to transistors and enhancing the reliability of the liquid crystal apparatus by stabilizing the operation of the static electricity protection circuit.
Implementation Method 1
When the potential of the signal wiring 501 is outside of the range of VL to VH due to static electricity, one of the p-type transistor 504 and the n-type transistor 505 is in an ON state... an electrical charge which is applied to the signal wiring 501 due to static electricity is distributed (discharged)
Data Source
AI summary
A first static electricity protection circuit is provided with a first n-type transistor and a first p-type transistor, a second static electricity protection circuit is provided with at least one of a second n-type transistor and a second p-type transistor, a source is connected with a gate in these transistors, a gate of the first n-type transistor is electrically connected with a low potential power wiring VSS, a drain of the first n-type transistor is electrically connected with a signal wiring SL, a gate of the first p-type transistor is electrically connected with a high potential power wiring VDD, a drain of the first p-type transistor is electrically connected with the signal wiring SL, and a drain of at least one of the second n-type transistor and the second p-type transistor is electrically connected with the low potential power wiring VSS or the high potential power wiring VDD.