OLED Display Sealant Design for Substrate Bending and Newton's Ring Control
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Solution Overview
Problem
OLED displays face issues with substrate bending and Newton's ring phenomenon due to improper sealant thickness, leading to adhesion failures and insufficient pressure when the sealant is thinner, and excessive bending when thicker, affecting the sealing process.
Innovation Solution
An OLED display design with a sealant, such as frit, that forms a predetermined gap between substrates, maintaining a contact force of 0.6 to 0.75 N/mm and specific dimensions (e.g., sealant width of 550 to 1000 um, distance from sealant to OLED of 1 mm) to minimize substrate bending and ensure secure adhesion while reducing Newton's ring phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the thickness of the sealant is increased to ensure sufficient adhesion pressure, then the contact force between sealant and substrate is improved, but substrate bending and Newton's ring phenomenon occur
Solution Approach 1:
The sealant thickness is varied in different regions: thicker at the edges (50-150 μm) for strong adhesion, and thinner at the center (0-50 μm) to prevent substrate bending and Newton's ring phenomenon. This local variation optimizes both adhesion force and substrate flatness.
Solution Approach 2:
The sealant thickness is designed to vary along the thickness dimension, creating a gradient structure where the thickness transitions from the substrate interface toward the OLED. This dimensional variation allows simultaneous optimization of adhesion at the interface and prevention of bending at the center.
2Shape
If the thickness of the sealant is decreased to minimize substrate bending, then Newton's ring phenomenon is reduced, but insufficient pressure is applied resulting in adhesion failure
Solution Approach 1:
The sealant thickness is varied in different regions: thicker at the edges (50-150 μm) for strong adhesion, and thinner at the center (0-50 μm) to prevent substrate bending and Newton's ring phenomenon. This local variation optimizes both adhesion force and substrate flatness.
Solution Approach 2:
The sealant thickness is designed to vary along the thickness dimension, creating a gradient structure where the thickness transitions from the substrate interface toward the OLED. This dimensional variation allows simultaneous optimization of adhesion at the interface and prevention of bending at the center.
3Reliability
If the sealant thickness is increased to ensure sufficient pressure for sealing, then adhesion reliability is improved, but the contact force becomes too high causing substrate deformation
Solution Approach 1:
The sealant thickness is varied in different regions: thicker at the edges (50-150 μm) for strong adhesion, and thinner at the center (0-50 μm) to prevent substrate bending and Newton's ring phenomenon. This local variation optimizes both adhesion force and substrate flatness.
Solution Approach 2:
The sealant thickness is designed to vary along the thickness dimension, creating a gradient structure where the thickness transitions from the substrate interface toward the OLED. This dimensional variation allows simultaneous optimization of adhesion at the interface and prevention of bending at the center.
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 adheres and seals substrates, minimizing substrate bending and Newton's ring occurrence, ensuring reliable sealing and maintaining high display quality by optimizing sealant placement and pressure distribution.
Implementation Method 1
a sealant disposed between the first substrate and the second substrate to adhere and seal the first substrate and the second substrate
Implementation Method 2
The OLED display has self luminous characteristics and does not require a separate light source
Implementation Method 3
the sealant is cured using a curing means such as laser
Data Source
AI summary
An organic light emitting diode (OLED) display includes: a first substrate; an OLED disposed on the first substrate; a second substrate disposed opposite to the first substrate with the OLED interposed therebetween; and a sealant disposed between the first substrate and the second substrate to adhere and seal the first substrate and to form a predetermined gap to enclose the OLED, wherein a contact force between the sealant and the first substrate is 0.6 to 0.75 N/mm.