Cover Window Printed Layer Side Surface Ink Overflow Prevention
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Solution Overview
Problem
Conventional cover windows experience ink overflow issues due to the printed layer extending to the front surface area, which damages the printed layer on the side surfaces during removal, leading to ineffective light blocking and adhesive strength challenges.
Innovation Solution
A cover window design featuring a window substrate with a first functional layer of high surface energy materials like SiO2 or Al2O3, a second functional layer with a low surface energy anti-fingerprint coating, and a printed layer that does not extend to the front surface area, enhancing adhesive strength and preventing ink overflow by contacting the second functional layer on the side surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the printed layer extends to the front surface area, then the light blocking coverage is improved, but the ink overflow problem occurs and the printed layer on side surfaces is damaged during removal
Solution Approach 1:
The patent introduces a side surface area dimension as an intermediate zone between the front surface area and rear surface area. The printed layer is configured to extend to the side surface area but stop before reaching the front surface area, using the side surface as a dimensional buffer to prevent ink overflow while maintaining light blocking coverage.
Solution Approach 2:
The side surface area acts as an intermediary zone that receives the printed layer extension. By positioning the printed layer to contact the second functional layer on the side surface area, the patent creates a mediator region that prevents direct extension to the front surface, thereby preventing ink overflow and protecting the front surface from damage during removal.
2Area of stationary object
If the printed layer extends to the front surface area, then the light blocking coverage is improved, but adhesive strength is compromised
Solution Approach 1:
The patent utilizes the side surface area as an intermediate dimensional zone where the printed layer contacts the second functional layer. This side surface contact zone provides sufficient adhesive bonding area without requiring the printed layer to extend to the front surface, thereby maintaining adhesive strength while preventing ink overflow.
3Ease of repair
If the printed layer is removed, then the light blocking function is restored, but the printed layer on side surfaces is damaged due to extension
Solution Approach 1:
The side surface area serves as an intermediary contact zone between the printed layer and the second functional layer. This intermediate position allows the printed layer to be removed from the front surface without damaging the side surface printed layer, as the side surface acts as a protective buffer zone that maintains integrity during removal operations.
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 ink overflow and enhances adhesive strength between the window substrate and the printed layer, improving the light blocking properties and durability of the cover window.
Implementation Method 1
a first functional layer covering the front surface area of the window substrate and a portion of each of the plurality of side surface areas of the window substrate
Implementation Method 2
a second functional layer covering the first functional layer in the front surface area and a portion of the first functional layer in the plurality of side surface areas
Data Source
AI summary
A cover window includes a window substrate including a front surface area, multiple side surface areas surrounding the front surface area, and a rear surface area facing the front surface area, a first functional layer covering the front surface area of the window substrate and a portion of each of the plurality of side surface areas of the window substrate, a second functional layer covering the first functional layer in the front surface area and a portion of the first functional layer in the side surface areas, and a printed layer extending from the side surface areas to a portion of the rear surface area, contacting the second functional layer in the side surface areas, and covering another portion of the first functional layer and the rear surface area of the window substrate.