Substrate Edge Encapsulation for Moisture-Resistant LED Displays
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Solution Overview
Problem
Display devices using LEDs are susceptible to moisture permeation, which leads to ionization of wiring lines and electrodes, causing migration and corrosion, thereby reducing reliability and image quality.
Innovation Solution
A display device design incorporating a substrate with active and non-active areas, pad electrodes, side lines, a side insulating layer, and an encapsulation layer to block moisture ingress, minimizing ionization and corrosion of conductive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an encapsulation layer is added to block moisture, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements a multi-layer encapsulation structure where an encapsulation layer is nested within the display device, surrounding the substrate and conductive components. This nested configuration creates a protective barrier against moisture while maintaining a compact overall device structure, resolving the contradiction between improved reliability and increased device complexity.
Solution Approach 2:
The encapsulation layer is implemented as a thin film structure that conformally covers the substrate and wiring lines. This thin film approach provides effective moisture barrier protection without adding significant structural complexity or volume to the display device, thus improving reliability while minimizing the increase in device complexity.
2Object-affected harmful factors
If the encapsulation layer completely covers the substrate, then moisture protection is improved, but manufacturing complexity increases
Solution Approach 1:
The encapsulation layer is strategically positioned to cover critical areas susceptible to moisture damage, such as the substrate edges and regions around wiring lines, rather than requiring complete universal coverage. This localized approach provides effective moisture protection for vulnerable components while simplifying the manufacturing process compared to full-substrate encapsulation.
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 design effectively blocks moisture entry, reducing ionization and migration phenomena, enhancing the reliability and stability of the display device.
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
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.