Display Transistor Layout for Static Electricity Discharge Protection
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Solution Overview
Problem
Display devices are vulnerable to damage from static electricity, which can flow through lines and damage pixel elements, and existing discharge diodes can also be damaged by static electricity.
Innovation Solution
A transistor design that includes a substrate with an active layer having a first region, a second region, and a channel region, a gate electrode overlapping the channel region, and a first connection electrode with a higher resistance than the gate electrode, which connects the gate electrode and the second electrode, preventing static electricity from damaging the transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a discharge diode is used to discharge static electricity, then static electricity can be discharged, but the discharge diode may be damaged by static electricity
Solution Approach 1:
The transistor is divided into multiple functional regions: a first region (source/drain) for normal current flow, a second region (drain/source) for static electricity discharge, and a channel region for charge carrier transport. This segmentation allows different regions to handle different functions, enabling the transistor to discharge static electricity through the second region while protecting the channel region from damage.
Solution Approach 2:
The channel region acts as an intermediary between the first region and the second region. When static electricity enters through the first region, it must pass through the channel region to reach the second region for discharge. The channel region's semiconductor properties control and limit the current flow, preventing direct damage while enabling static electricity discharge functionality.
2Reliability
If static electricity flows through the transistor to discharge, then static electricity can be removed from the display device, but the transistor may be damaged by the static electricity
Solution Approach 1:
Different regions of the transistor are designed with different local qualities: the first region and second region are doped to form high-conductivity regions for current entry and discharge, while the channel region maintains controlled conductivity to limit current. This local quality differentiation enables the transistor to safely handle static electricity by directing it through specific paths while protecting vulnerable regions.
Solution Approach 2:
The transistor structure is designed in advance with a channel region that inherently limits current flow before static electricity can cause damage. The channel region's semiconductor properties act as a built-in protection mechanism that cushions against high-voltage static electricity surges, preventing damage to the transistor while still allowing discharge functionality.
Data Source
AI summary
A transistor is disclosed that includes a substrate, an active layer, a gate electrode, a first electrode, a second electrode, and a first connection electrode. The active includes a first region, a second region, and a channel region between the first region and the second region. The gate electrode is disposed on the active layer and overlaps the channel region. The first electrode is disposed on the substrate and electrically connects to the first region. The second electrode is disposed on the substrate and electrically connects to the second region. The first connection electrode is disposed on the substrate and electrically connects the gate electrode and the second electrode.