OLED Encapsulation Layout With Dam and Voltage Line Moisture Barrier
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Solution Overview
Problem
OLED displays are susceptible to degradation due to environmental factors like moisture and oxygen, necessitating effective protection measures.
Innovation Solution
An OLED display design incorporating a substrate, display unit, thin film encapsulation layer, voltage line, and dam unit with a metal layer and multiple dams to enhance environmental protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If a thin film encapsulation layer is used to seal the OLED display, then the display can be made light and thin, but the protection against environmental factors like moisture and oxygen is insufficient
Solution Approach 1:
The patent employs a composite encapsulation structure combining organic thin film layers with inorganic barrier layers. The organic layers provide flexibility and light weight, while the inorganic layers provide superior moisture and oxygen barrier properties. This composite approach resolves the contradiction by achieving both lightweight/thin characteristics and enhanced environmental protection.
Solution Approach 2:
The encapsulation system is divided into multiple segmented layers including first and second organic encapsulation layers, first and second inorganic encapsulation layers, and intermediate layers. This segmentation allows each layer to perform its specialized function optimally while collectively providing comprehensive protection, resolving the contradiction between thinness and protection efficacy.
2Reliability
If voltage lines are extended to surround the display area for electrical connection, then electrical connectivity is improved, but the risk of moisture ingress and short circuits at the line edges increases
Solution Approach 1:
The patent uses flexible organic encapsulation films that conformally cover the voltage lines and extend beyond their edges. These thin film barriers prevent moisture ingress at the vulnerable line edges while maintaining electrical connectivity, resolving the contradiction between connectivity and protection.
Solution Approach 2:
The encapsulation structure is nested around the voltage lines, with organic and inorganic layers enveloping the conductive elements. This nested configuration ensures that the protective layers surround and protect the electrical connections from environmental factors while maintaining their functionality.
3Ease of manufacture
If the organic emission layer is extended beyond the pixel area to improve manufacturing, then manufacturing ease is improved, but the risk of organic material degradation from environmental exposure increases
Solution Approach 1:
The organic encapsulation layers act as flexible protective shells that extend beyond the pixel area to cover any exposed organic emission material. This allows the emission layer to be manufactured with extended coverage for ease of fabrication while the encapsulation films prevent environmental degradation of the exposed organic material.
Solution Approach 2:
The encapsulation structure is designed beforehand to extend beyond the necessary functional areas, providing preemptive protection for any organic material that extends during manufacturing. This prior cushioning approach allows manufacturing flexibility while ensuring environmental protection.
Data Source
AI summary
An organic light-emitting diode display is disclosed. In one aspect, the display includes a display unit located on the substrate and including a display area and a non-display area surrounding the display area, and a thin film encapsulation layer sealing the display unit. The display also includes a voltage line formed in the non-display area and surrounding the display area, a metal layer formed of the same material as the voltage line, and a dam surrounding the display area and contacting the voltage line. The voltage line includes a first voltage line disposed in one side of the display area. The first voltage line includes a pair of first end portions and a pair of first connectors respectively connected to the pair of first end portions and extending away from the display area. The metal layer is disposed between the pair of first connectors. The dam contacts the metal layer.