Seal Portion with Variable Thickness for Newton's Ring Suppression
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Solution Overview
Problem
Display apparatuses experience the Newton's ring effect due to differences in light paths caused by curved encapsulation substrates, leading to visual interference and reduced performance.
Innovation Solution
A display apparatus with a sealing portion that has varying thicknesses at different points, forming a specific geometric pattern to minimize the visibility of Newton's rings, achieved through the application of a seal material with different widths and thicknesses at strategic points, bonded using a laser beam to create a seal that concentrates interference patterns outside the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform thickness seal portion is used to bond the substrate and encapsulation panel, then the bonding is simple and reliable, but Newton's ring effect occurs due to curved encapsulation substrate causing light path differences
Solution Approach 1:
The seal portion is designed with non-uniform thickness, having a first thickness at a first point and a second thickness at a second point, where the thickness varies locally to compensate for the curved encapsulation substrate and eliminate Newton's ring effect while maintaining bonding reliability
Solution Approach 2:
The thickness parameter of the seal portion is changed from a uniform value to a variable value that differs at different points, specifically setting the first thickness to be about 60% to about 90% of the second thickness to counteract the curvature-induced optical interference
2Length of moving object
If the encapsulation substrate is made thinner to achieve thinner and lighter display apparatus, then the overall device becomes more compact, but the substrate curvature increases causing more severe Newton's ring effect
Solution Approach 1:
The seal portion's thickness is locally adjusted at different measurement points to compensate for the increased substrate curvature that results from using thinner encapsulation substrates, thereby preventing Newton's ring effect while maintaining the thin-profile design
3Object-affected harmful factors
If the seal portion thickness is varied to prevent Newton's ring, then optical interference is eliminated, but the manufacturing complexity increases due to different thickness requirements
Solution Approach 1:
The thickness parameter of the seal portion is systematically varied according to a defined relationship (first thickness being about 60% to about 90% of the second thickness), which provides a clear manufacturing guideline that balances optical performance with manufacturability
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 prevents the visual recognition of Newton's rings by concentrating them outside the display area, maintaining the display's performance and appearance while ensuring effective sealing against external factors.
Implementation Method 1
the substrate and the encapsulation substrate are bonded to each other by a sealing portion
Implementation Method 2
irradiating a laser beam to the substrate and the encapsulation substrate that are aligned to melt and cure the seal material
Implementation Method 3
a difference in paths of light incident from the outside occurs, and Newton's ring effect, that is a series of concentric rings caused by optical interference, may occur
Data Source
AI summary
A display apparatus comprises a substrate, an encapsulation panel opposing the substrate, a display unit disposed between the substrate and the encapsulation panel and a seal portion bonding the substrate and the encapsulation panel and surrounding the display unit. The seal portion comprises a first surface facing the substrate and a second surface facing the encapsulation panel. The seal portion has a first thickness that is a distance between the first surface and the second surface measured at a first point and a second thickness that is a distance between the first surface and the second surface measured at a second point. A first virtual line passing a center point of the display area and the first point is substantially perpendicular to a second virtual line passing the center point and the second point. The first thickness is substantially different from the second thickness.