Substrate Edge Encapsulation for Moisture-Resistant Display Wiring
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Solution Overview
Problem
Display devices face issues with moisture permeation, which leads to ionization of conductive components, migration phenomena, and corrosion of wiring lines and electrodes, affecting the reliability and performance of the devices.
Innovation Solution
A display device design that includes a substrate with an active area of sub-pixels, a non-active area, first and second pad electrodes, side lines, a side insulating layer, an encapsulation layer, and a seal member. The encapsulation layer surrounds the substrate's surfaces to block moisture entry, minimizing ionization and migration issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display device uses conventional wiring lines and electrodes without enhanced protection, then the device complexity is reduced, but moisture permeation causes ionization and corrosion of conductive components
Solution Approach 1:
The patent implements nested encapsulation structures where an encapsulation layer surrounds the substrate, and a seal member surrounds a part of the encapsulation layer. This nested arrangement creates multiple barriers against moisture while maintaining a compact integrated structure, resolving the contradiction between reliability improvement and device complexity increase.
Solution Approach 2:
The encapsulation layer and seal member act as intermediary protective barriers between the external environment (moisture source) and the internal conductive components (wiring lines and electrodes). These intermediaries prevent direct contact between moisture and conductive components, thereby preventing ionization and corrosion while maintaining structural integrity.
2Reliability
If the display device lacks comprehensive moisture blocking structures, then the manufacturing process is simpler, but ionization and migration phenomena occur due to moisture entry
Solution Approach 1:
The nested arrangement of the encapsulation layer surrounding the substrate and the seal member surrounding the encapsulation layer creates multiple protective barriers. This structure provides comprehensive moisture protection while using standard manufacturing techniques for forming encapsulation layers and seal members, making the enhanced protection relatively easy to manufacture.
3Object-affected harmful factors
If the display device uses additional protective layers and seal members, then moisture permeation is minimized, but the device volume increases
Solution Approach 1:
The encapsulation layer and seal member are implemented as thin film structures that conformally cover the substrate and its components. These thin protective layers provide effective moisture barrier functionality while adding minimal volume to the overall device structure, thus minimizing the impact on device size.
4Reliability
If the display device uses comprehensive encapsulation and sealing structures, then corrosion of wiring lines and electrodes is prevented, but the manufacturing complexity increases
Solution Approach 1:
The nested structure of the encapsulation layer and seal member provides comprehensive protection for wiring lines and electrodes against moisture-induced corrosion. The encapsulation layer forms the first barrier, and the seal member provides an additional sealing layer, creating a robust protective system while maintaining a relatively simple integrated architecture.
Solution Approach 2:
The encapsulation layer and seal member serve as intermediary protective structures between the external moisture environment and the internal conductive components. These intermediaries prevent direct exposure of wiring lines and electrodes to moisture, thereby preventing corrosion while adding controlled complexity to the device structure.
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 proposed solution effectively minimizes moisture permeation, reducing ionization and migration phenomena, and thereby improving the reliability and performance of the display device by preventing corrosion of wiring lines and electrodes.
Implementation Method 1
an encapsulation layer which surrounds the front surface, the rear surface, and the side surface of the substrate... to block moisture entering from the outside to the inside of the display device
Implementation Method 2
a side insulating layer which surrounds the plurality of side lines and includes a black material
Data Source
AI summary
A display device may include a substrate; an active area in which the plurality of sub pixels is disposed; a non-active area which surrounds the active area; a plurality of first pad electrodes disposed in the non-active area on a front surface of the substrate; a plurality of second pad electrodes disposed in the non-active area on a rear surface of the substrate; a plurality of side lines disposed on the front surface, the rear surface, and a side surface of the substrate to electrically connect the plurality of first pad electrodes and the plurality of second pad electrodes; a side insulating layer surrounding the plurality of side lines and including a black material; an encapsulation layer surrounding the front surface, the rear surface, and the side surface of the substrate; and a seal member surrounding a part of the encapsulation layer.