OLED Display Static Shielding via Carbon Nanotube Layer
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Solution Overview
Problem
Flexible flat display devices, including organic light emitting diode (OLED) displays, are prone to damage from static electricity generated during manufacturing processes, such as when release papers are removed, causing tens to hundreds of volts of static electricity that can harm the elements.
Innovation Solution
Incorporating a carbon nanotube thin film and a multi-layered barrier layer with alternately stacked silicon oxide and silicon nitride layers between the base film, thin film transistor, and organic light emitting diode, along with a flexible thin film encapsulating layer, to control and prevent static electricity damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple detaching processes are performed during manufacturing, then the flexible flat display device can be manufactured with stable quality, but static electricity of several tens to several hundred volts is generated causing damage to the elements
Solution Approach 1:
A ground layer is introduced as an intermediary between the plastic substrate and the thin film transistor to shield the electronic elements from static electricity. The ground layer acts as a mediator that dissipates static charges before they can reach and damage the sensitive OLED components, while still allowing the manufacturing detaching processes to proceed
Solution Approach 2:
The patent employs a composite structure combining plastic substrate, ground layer material, and thin film transistor layers. This composite construction integrates the electrical shielding function of the ground layer with the mechanical flexibility of the plastic substrate, creating a multi-functional structure that addresses both manufacturing stability and static electricity protection
2Reliability
If a ground layer is added to prevent static electricity damage, then element protection is improved, but the device structure becomes more complex
Solution Approach 1:
The ground layer is implemented as a thin film structure that can be deposited directly onto the plastic substrate using conventional thin film deposition techniques. This thin film approach provides effective electrical shielding while maintaining the overall flexibility and thin profile of the display device, minimizing the impact on device complexity
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 carbon nanotube thin film and barrier layer effectively shield the OLED display components from static electricity, ensuring stable and flexible manufacturing by preventing damage and maintaining electrical conductivity while blocking moisture and oxygen.
Implementation Method 1
a carbon nanotube thin film disposed among the base film, the thin film transistor, and the organic light emitting diode
Implementation Method 2
a barrier layer disposed among the base film, the thin film transistor, and the organic light emitting diode... The barrier layer includes a plurality of inorganic layers... The barrier layer has a multi-layered configuration in which a silicon oxide layer and a silicon nitride layer are alternately stacked
Implementation Method 3
a thin film encapsulating layer for covering the thin film transistor and the organic light emitting diode
Data Source
AI summary
An organic light emitting diode display includes: a base film made of plastic; a thin film transistor and an organic light emitting diode formed on the base film; and a carbon nanotube thin film disposed among the base film, the thin film transistor, and the organic light emitting diode.