Thin Film Encapsulation Edge Positioning for OLED Moisture Protection
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Solution Overview
Problem
Existing display devices with organic light emitting layers face challenges in protecting the organic material from oxygen and moisture, as current encapsulation techniques may not effectively prevent air and moisture penetration, leading to potential damage and reliability issues.
Innovation Solution
A display device with a thin film encapsulating layer comprising alternating inorganic and organic layers, where the edges of the encapsulating layer are strategically positioned to overlap specific insulating layers, reducing the impact of static electricity during deposition and preventing micro cracks in conductive layers, thereby enhancing the reliability of the encapsulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thin film encapsulating layer is used to protect the organic light emitting layer, then the protection from moisture and oxygen is improved, but static electricity during deposition may cause micro cracks in conductive layers
Solution Approach 1:
An inorganic insulating layer is introduced as an intermediary between the conductive layer and the encapsulating layer. This intermediary layer acts as a mediator that blocks the transmission of static electricity and arching phenomena from the deposition process, preventing micro cracks in the conductive layer while still allowing the encapsulating layer to provide moisture and oxygen protection
Solution Approach 2:
The inorganic insulating layer is deposited beforehand to cushion or absorb the harmful effects of static electricity and arching phenomena that occur during the deposition of the encapsulating layer. This prior cushioning prevents the harmful effects from reaching and damaging the conductive layer
2Reliability
If the encapsulating layer is deposited to cover the conductive layer, then complete protection is achieved, but static electricity and arching phenomena damage the conductive layer
Solution Approach 1:
The inorganic insulating layer serves as a protective intermediary that allows the encapsulating layer to be deposited over the conductive layer for complete coverage, while simultaneously protecting the conductive layer from static electricity and arching phenomena damage during the deposition process
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 effectively protects the organic light emitting layer from moisture and oxygen, reducing the risk of damage and improving the overall reliability of the display device by using a layered encapsulation structure that mitigates the effects of static electricity and arching phenomena.
Implementation Method 1
a thin film encapsulating layer is disposed on an organic light emitting element to block air, moisture, and the like from penetrating to the organic light emitting element
Implementation Method 2
a predetermined static electricity may be generated at an edge of a mask
Implementation Method 3
The thin film encapsulating layer may include an inorganic layer, which includes an inorganic material, and an organic layer, which includes an organic material, alternatively laminated
Data Source
AI summary
A display device includes a base layer including a display area, a non-display area, and a pad area. The display device further includes a circuit layer disposed on the base layer and including a plurality of insulating layers and a plurality of conductive layers. The display device additionally includes a light emitting element layer disposed on the circuit layer, and a thin film encapsulating layer disposed on the light emitting element layer. An edge of the thin film encapsulating layer disposed between the display area and the pad area includes a first edge and a second edge, and the first edge is disposed on an insulating layer among the plurality of insulating layers. The insulating layer includes an inorganic material.