OLED Display Substrate Barrier Layer with Up-conversion Material
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Solution Overview
Problem
In OLED display substrates, the organic encapsulating layer is not completely encapsulated by the inorganic layer, leading to inferior oxygen and moisture resistance due to the organic ink climbing over the barrier layer and not being fully stabilized during curing.
Innovation Solution
A display substrate with a base substrate, light emitting elements, an encapsulating layer, and barrier layers with up-conversion materials that convert incident light into ultraviolet light to stabilize the organic encapsulating sub-layers, ensuring complete encapsulation and improved resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an organic encapsulating layer is used in OLED display substrates, then flexibility and ease of manufacture are improved, but oxygen and moisture resistance deteriorate due to the organic ink climbing over the barrier layer and not being fully stabilized during curing
Solution Approach 1:
The patent applies preliminary action by introducing a barrier layer with up-conversion material before forming the organic encapsulating layer. This barrier layer is prepared in advance to prevent the organic ink from climbing over, addressing the encapsulation issue before it occurs. The up-conversion material is pre-positioned to convert incident light into UV light that will stabilize the organic layer, ensuring proper curing before any potential climbing can compromise the encapsulation.
Solution Approach 2:
The patent employs composite materials by combining the organic encapsulating layer with an inorganic barrier layer containing up-conversion materials. This composite structure integrates the manufacturing advantages of organic materials with the protective properties of inorganic materials. The up-conversion material within the barrier layer converts incident light to UV light, which cures the organic material effectively, creating a synergistic encapsulation system that prevents climbing while ensuring complete curing.
2Device complexity
If the organic encapsulating layer is not completely encapsulated by the inorganic layer, then the device complexity is reduced, but oxygen and moisture resistance deteriorates
Solution Approach 1:
The patent introduces an intermediary mechanism by using the up-conversion material as a mediator between incident light and the organic encapsulating layer. The up-conversion material converts incident light into UV light, which acts as an intermediary curing agent that stabilizes the organic material. This intermediary process ensures complete encapsulation and prevents climbing, achieving reliable oxygen and moisture resistance without requiring overly complex multi-layer inorganic structures.
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 solution provides enhanced oxygen and moisture resistance by stabilizing the organic encapsulating layers using UV light converted from incident light, preventing the organic ink from climbing over the barrier layers and ensuring complete encapsulation by the inorganic layers.
Implementation Method 1
the first barrier layer comprises an up-conversion material configured to convert an incident light into an ultraviolet light
Data Source
AI summary
The present application provides display substrate having a display area and a peripheral area. The display substrate includes a base substrate; a plurality of light emitting elements on the base substrate and in the display area; an encapsulating layer on a side of the plurality of light emitting elements distal to the base substrate to encapsulate the plurality of light emitting elements; and a first barrier layer on the base substrate and in the peripheral area and forming a first enclosure substantially surrounding a first area. The first barrier layer includes an up-conversion material configured to convert an incident light into an ultraviolet light. The encapsulating layer includes a first organic encapsulating sub-layer on the base substrate.