Floating Conductive Pad for Oxidation Resistance in TFT Pixels
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Solution Overview
Problem
The development of organic semiconductor thin film transistor devices is limited due to poor electrical connections between source/drain electrodes and pixel electrodes, primarily caused by oxidation, which affects the overall electrical performance of display panels.
Innovation Solution
A pixel structure and electrical bridging structure are designed with a floating conductive pad made of antioxidant materials, electrically connected to source/drain electrodes and pixel electrodes through contact holes in an insulating layer, preventing oxidation and ensuring good electrical charge injection and connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If organic semiconductor material is used in thin film transistor devices, then flexibility and compatibility of low temperature process are improved, but source/drain electrode oxidation occurs causing poor electrical connection
Solution Approach 1:
A floating conductive pad made of antioxidant material (such as titanium nitride, molybdenum nitride, or indium tin oxide) is introduced as an intermediary between the source/drain electrode and the pixel electrode. This mediator prevents direct oxidation of the source/drain electrode while maintaining electrical connection, thereby resolving the contradiction between using organic semiconductor material and ensuring reliable electrical connection.
2Reliability
If source/drain electrode is exposed to prevent oxidation, then electrical connection is improved, but device complexity increases due to additional protective structures
Solution Approach 1:
The floating conductive pad serves multiple functions simultaneously: it acts as an antioxidant barrier, provides electrical connection, and serves as a contact point for the pixel electrode. This multi-functionality improves electrical connection reliability without proportionally increasing device complexity, as one structure accomplishes multiple protective and conductive roles.
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
This configuration enhances the electrical performance of thin film transistor devices and display panels by preventing oxidation of source/drain electrodes and ensuring stable connections, thereby improving charge injection efficiency.
Implementation Method 1
the material of the floating conductive pad includes an antioxidant material
Data Source
AI summary
A pixel structure includes a thin film transistor device, an insulating layer disposed on the thin film transistor device, and a pixel electrode disposed on the insulating layer. The thin film transistor device includes a floating conductive pad disposed at one side of a semiconductor layer, and electrically connected to a source/drain electrode. The insulating layer has a first contact hole partially exposing the floating conductive pad. The pixel electrode is electrically connected to the floating conductive pad via the first contact hole.