Foreign Substance Collecting Member for OLED Turn-On Defect Prevention
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Solution Overview
Problem
Conventional organic electroluminescence display devices face turn-on defects due to foreign substances that permeate into the light emitting layer or conductive layers during manufacturing, leading to defective layers and disconnected anodes or cathodes, which result in non-functional areas when the device is turned on.
Innovation Solution
Incorporating a foreign substance collecting member, made of ferromagnetic materials, in a designated non-display area of the device, which collects foreign substances using a magnetic field during the deposition process, preventing them from affecting the light emitting area and thus avoiding turn-on defects without the need for costly vacuum chamber upgrades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional manufacturing process is used without a foreign substance collecting member, then the manufacturing process is simple, but foreign substances permeate into the light emitting layer or conductive layer causing turn-on defects
Solution Approach 1:
A foreign substance collecting member is introduced as an intermediary component in the manufacturing process. This member is disposed in a non-display area and configured to collect foreign substances during deposition, preventing them from permeating into the light emitting layer or conductive layer. The collecting member acts as a mediator that intercepts foreign substances without requiring changes to the core manufacturing process or vacuum chamber environment.
2Reliability
If the vacuum chamber environment is improved to prevent foreign substance generation, then foreign substance permeation is reduced, but manufacturing cost increases significantly
Solution Approach 1:
The foreign substance collection function is extracted from the vacuum chamber environment and relocated to a separate collecting member disposed in the display device. Instead of improving the vacuum chamber to prevent foreign substance generation, the solution extracts the harmful effect by providing a dedicated component that collects foreign substances during deposition. This approach avoids costly vacuum chamber upgrades while achieving the same reliability improvement.
3Reliability
If a foreign substance collecting member is added to collect foreign substances, then turn-on defects are prevented, but the device structure becomes more complex
Solution Approach 1:
The foreign substance collecting member is disposed specifically in a non-display area of the device, concentrating the protective function in a localized region. This allows the light emitting area to maintain its simple structure while the non-display area contains the additional complexity of the collecting member. The local quality principle ensures that the structural addition does not interfere with the light emitting function or require changes to the display area structure.
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 solution effectively prevents turn-on defects by isolating foreign substances in a non-display area, ensuring the light emitting area remains functional and reducing manufacturing costs by not requiring improvements to the vacuum chamber environment.
Implementation Method 1
a foreign substance collecting member, made of ferromagnetic materials, in a designated non-display area of the device, which collects foreign substances using a magnetic field during the deposition process
Data Source
AI summary
An organic electroluminescence display device has a plurality of pixels, each of the pixels including a first portion and a second portion. The first portion has an organic light emitting element and is configured to display images. The second portion is a transparent transmission area through which an external object is visible and includes a foreign substance collecting member. The foreign substance collecting member is made of a ferromagnetic substance and is configured to receive electric current from an external current source through a connecting line and an electric field application pad. When electric current is applied to the electric field application pad, a magnetic field is applied to the foreign substance collecting member, and foreign substance in the first portion is collected by the foreign substance collecting member in the second portion, preventing the foreign substance from being deposited in the first portion.