OLED UV Blocking Film in Encapsulation Layer
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Solution Overview
Problem
Conventional organic light emitting displays face complexity in manufacturing due to the need for separate shading masks or hygroscopic agents to prevent ultraviolet ray exposure, which can lead to semiconductor film degradation and increased process complexity.
Innovation Solution
Incorporating an ultraviolet ray blocking film within the encapsulation layer or on the upper substrate, composed of materials like benzotriazoles, benzophenones, or cyano acrylates, to block UV rays during the curing process, eliminating the need for additional masking or hygroscopic agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate shading mask is used to block UV rays from reaching the display region, then the semiconductor film is protected from degradation, but the manufacturing process becomes very complicated
Solution Approach 1:
The patent combines the UV-blocking function with the existing encapsulation layer by incorporating an ultraviolet ray blocking film into it. This merging eliminates the need for a separate shading mask, thereby simplifying the manufacturing process while maintaining protection of the semiconductor film from UV degradation
Solution Approach 2:
The encapsulation layer is given multiple functions: it continues to provide its primary protective role while also incorporating UV-blocking capability through the integrated ultraviolet ray blocking film. This multi-functionality eliminates the need for separate UV-protection components
2Object-affected harmful factors
If a shading mask is used to cover the display region, then UV rays are blocked from the OLED and TFT, but the positioning accuracy must be very high to prevent UV exposure
Solution Approach 1:
By integrating the UV-blocking function into the encapsulation layer itself, the patent eliminates the positioning issues associated with separate shading masks. The UV protection is inherently aligned with the display region boundaries since it is part of the encapsulation structure, removing the need for high positioning accuracy
3Reliability
If a hygroscopic agent is applied to block UV rays, then the light emitting unit and driving unit are protected, but the manufacturing process becomes more complicated
Solution Approach 1:
The patent merges the UV-blocking function with the encapsulation layer structure, eliminating the need for separate hygroscopic agents. This integration simplifies the manufacturing process by removing additional application and assembly steps while maintaining effective UV protection
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 protects the driving and light emitting units from ultraviolet degradation without additional processing steps, simplifying the manufacturing process and ensuring component integrity.
Implementation Method 1
an ultraviolet ray blocking film formed in a region to block the driving unit and the light emitting unit from being irradiated by UV rays
Implementation Method 2
ultraviolet rays are radiated for a predetermined time onto the UV sealing adhesive 16 for purposes of curing
Data Source
AI summary
An organic light emitting display including an ultraviolet protecting layer and a method of manufacturing the same include a lower substrate; an ultraviolet hardening adhesive formed on the lower substrate; a driving unit and a light emitting unit deposited on the lower substrate and surrounded by the ultraviolet hardening adhesive; an encapsulation layer covering the driving unit and light emitting unit and preventing moisture and oxygen penetration from an outside; an upper substrate arranged on the encapsulation layer facing the lower substrate and fixed by the ultraviolet hardening adhesive; and an ultraviolet ray blocking film formed in a region to block the driving unit and the light emitting unit from being irradiated by UV rays radiated to harden the ultraviolet hardening adhesive. The ultraviolet ray blocking film is disposed in the encapsulation layer or on the upper substrate to protect the driving unit and light emitting unit from ultraviolet rays.