Inorganic LED Perimeter Barrier for OLED Moisture Protection
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Solution Overview
Problem
The challenge is to enhance the moisture permeation reliability of organic light emitting display apparatuses while minimizing the bezel area, as existing techniques face limitations in reducing the bezel area without compromising moisture barrier effectiveness.
Innovation Solution
The solution involves a display apparatus design where an inorganic light emitting diode is placed in the outer peripheral area to protect an organic light emitting diode in the inner area, minimizing the number of dams and ensuring minimal moisture and oxygen permeation, with the inorganic diodes forming a barrier around the organic diodes to maintain reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the bezel area is reduced to make the display apparatus thinner, then the thickness is reduced, but the moisture permeation reliability deteriorates
Solution Approach 1:
An inorganic light emitting diode is introduced as an intermediary protective element disposed between the organic light emitting diode and the external environment. This inorganic LED acts as a mediator that blocks moisture and oxygen permeation paths, allowing the bezel area to be reduced while maintaining moisture barrier reliability through the protective function of the inorganic component.
2Device complexity
If the number of dams is minimized to reduce device complexity, then the manufacturing is simplified, but the moisture barrier effectiveness is compromised
Solution Approach 1:
The protective barrier function is extracted from the traditional dam structure and transferred to the inorganic light emitting diode. By removing the need for multiple dams and relying on the inherent moisture-blocking properties of the inorganic LED material, the device complexity is reduced while maintaining effective moisture barrier performance.
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 approach effectively maintains moisture permeation reliability while reducing the bezel area, allowing for thinner and more reliable organic light emitting display designs by using inorganic light emitting diodes to enclose and protect organic diodes from moisture and oxygen.
Implementation Method 1
an inorganic light emitting diode is disposed in the second display area surrounding the first display area... to protect the organic light emitting diode in the first display area from moisture and oxygen
Implementation Method 2
The first light emitting element includes an organic light emitting diode... an organic emission layer formed on a front surface of a substrate emits light
Data Source
AI summary
A display apparatus includes a substrate including a first display area and a second display area surrounding the first display area, a plurality of first sub-pixels disposed at the first display area, a plurality of second sub-pixels disposed at the second display area, a first light emitting element disposed at each of the plurality of first sub-pixels, and a second light emitting element disposed at each of the plurality of second sub-pixels. The first light emitting element includes an organic light emitting diode and the second light emitting element includes an inorganic light emitting diode.