Display Edge Sealing Structure for Narrow-Bezel Impact Durability
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Solution Overview
Problem
Display devices face damage from external impacts due to inadequate sealing, and increasing the attachment width of sealing members to improve adhesion leads to an undesirably larger non-display area, compromising durability and efficiency.
Innovation Solution
A display device structure featuring a sealing member with a first portion overlapping the edge of the pixel defining layer and a second portion extending outside, integrated with a coating layer, which includes materials with specific thermal expansion coefficients and elastic moduli to enhance attachment and reduce the non-display area while maintaining durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the attachment width of the sealing member is increased to improve adhesive property, then the reliability is improved, but the area of the non-display area increases
Solution Approach 1:
The sealing member is divided into two distinct portions: a first portion with a first width that overlaps the pixel defining layer, and a second portion with a second width that is smaller than the first width. This segmentation allows different regions of the sealing member to serve different functions - the first portion provides strong adhesion where needed, while the second portion reduces the overall non-display area footprint.
Solution Approach 2:
Different portions of the sealing member are given different widths to optimize local properties. The first portion has a larger width specifically where adhesion is most critical (overlapping the pixel defining layer), while the second portion has a reduced width where less adhesion is needed, thereby minimizing the non-display area without compromising overall sealing effectiveness.
2Strength
If the attachment width of the sealing member is increased to prevent damage from external impact, then the strength is improved, but the area of the non-display area increases
Solution Approach 1:
The sealing member is divided into two distinct portions: a first portion with a first width that overlaps the pixel defining layer, and a second portion with a second width that is smaller than the first width. This segmentation allows different regions of the sealing member to serve different functions - the first portion provides strong adhesion where needed, while the second portion reduces the overall non-display area footprint.
Solution Approach 2:
Different portions of the sealing member are given different widths to optimize local properties. The first portion has a larger width specifically where adhesion is most critical (overlapping the pixel defining layer), while the second portion has a reduced width where less adhesion is needed, thereby minimizing the non-display area without compromising overall sealing effectiveness.
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 secures a sufficient attachment area on the encapsulation substrate, reducing the non-display area and enhancing the display device's durability against external impacts while maintaining high light transmittance and efficiency.
Implementation Method 1
The first portion may include at least one of an alkali metal atom and an alkali metal positive ion
Implementation Method 2
A difference between thermal expansion coefficients of the first portion and the encapsulation substrate may be about 5% or less
Implementation Method 3
The second portion may include a material having an elastic modulus less than that of a material of the first portion
Data Source
AI summary
A display device may include a display substrate, an encapsulation substrate, and a sealing member. The display substrate may include a pixel defining layer. The sealing member may include a first portion having an inner portion between the display substrate and the encapsulation substrate and overlapping an edge portion of the pixel defining layer and an outer portion extending from the inner portion and located outside the inner portion; and a second portion between the outer portion and the display substrate.