Display Device Sealing Portion Area Expansion for Thermal Contraction
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Solution Overview
Problem
Display devices, such as organic light-emitting display devices, face challenges in maintaining structural strength and bonding reliability of the sealing portion between substrates, particularly due to the contraction and thermal energy distribution issues during laser sealing, which can lead to weakened sealing portions.
Innovation Solution
The design incorporates an area expansion portion in the sealing portion corresponding to the alignment key, with asymmetrical and semicircular shapes, to compensate for contraction and enhance structural rigidity, using a glass frit and conductive materials for improved bonding and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser sealing is applied to bond substrates, then bonding efficiency is improved, but thermal stress causes contraction and reduces structural strength of the sealing portion
Solution Approach 1:
The sealing portion is designed with different cross-sectional areas at different locations. The first cross-sectional area at the position corresponding to the alignment key is larger than the second cross-sectional area at other positions. This local variation in geometry compensates for thermal contraction during laser sealing, maintaining bonding efficiency while preserving structural strength at critical locations.
2Strength
If the sealing portion area is increased to compensate for contraction, then structural strength is improved, but device complexity increases
Solution Approach 1:
The sealing portion features an asymmetric cross-sectional area distribution along its length. The first cross-sectional area is intentionally made larger than the second cross-sectional area, creating an asymmetric geometry that specifically addresses thermal contraction at the alignment key position without requiring complex modifications throughout the entire sealing 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
This configuration enhances the structural strength and reliability of the sealing portion, maintaining the structural integrity and bonding efficiency of the display device, even in areas subjected to thermal stress during the laser sealing process.
Implementation Method 1
a first area expansion portion and a second area expansion portion that are respectively provided at both edges of the sealing portion in a width direction of the sealing portion and have different areas from each other, wherein the area expansion portions are formed so as to correspond to a contraction area of the sealing portion
Data Source
AI summary
A display device includes: a substrate on which a display unit is formed and an encapsulation unit for sealing the substrate; a touch screen panel formed on the encapsulation unit; a window cover provided on the touch screen panel; an alignment key for aligning positions of the display panel and the window cover; and a sealing portion disposed between the substrate and encapsulation unit. An area expansion portion is formed in a position of the sealing portion corresponding to the alignment key.