Display Window Bank Layer Ink Splatter Containment
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Solution Overview
Problem
Screen printing methods face challenges in preventing ink splatter and color defects during the formation of printed patterns on display devices, particularly on transparent substrates like smartphone screens, where any ink spread or splatter can be visible and affect the appearance.
Innovation Solution
A display device design incorporating a bank layer and a shielding layer on a transparent substrate, where the bank layer is formed along boundaries between display and non-display areas, and a printed pattern is created using screen printing with a squeegee, followed by a shielding layer to prevent ink exposure and splatter, ensuring effective display and aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If screen printing is used to apply ink onto the substrate, then the ink can be transferred to the substrate, but ink splatter and color defects occur due to ink surface tension
Solution Approach 1:
A bank layer is introduced as an intermediary structure between the printed pattern and the display area. This bank layer acts as a barrier that contains the ink within the designated non-display area, preventing ink splatter from spreading into the display area. The bank layer is formed by screen printing and extends from the first surface toward the second surface of the transparent substrate, creating a physical containment structure that resolves the ink splatter issue while maintaining the printing process.
2Shape
If the printed pattern is located in the non-display area closer to the outer side, then the appearance is improved, but the ink may still spread beyond designated areas
Solution Approach 1:
The non-display area is segmented into two functional zones: a printed pattern region closer to the outer side of the window for aesthetic purposes, and a bank layer region that acts as a containment barrier. The bank layer is formed along the boundaries of the display area and extends into the non-display area, creating distinct zones that separate the decorative printed pattern from the functional display area. This segmentation allows the printed pattern to be positioned for optimal appearance while the bank layer ensures ink containment.
3Object-generated harmful factors
If a shielding layer is added to cover the printed pattern, then the ink splatter is hidden, but the device complexity increases
Solution Approach 1:
The harmful function of the printed pattern (ink splatter visibility) is extracted and isolated by positioning it exclusively in the non-display area, beyond the boundary defined by the bank layer. The bank layer serves as an extraction barrier that removes the potential harm from the display area. This approach eliminates the need for an additional shielding layer, as the bank layer itself provides the necessary containment and hiding function, thereby avoiding increased device complexity.
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 splatter and color defects, maintaining the appearance of the display device by containing ink spread and ensuring the printed pattern is shielded from view, enhancing the display's visual integrity.
Implementation Method 1
moving a squeegee to fill ink in a mesh opening of a screen mask with the use of the tension applied to the mesh opening
Implementation Method 2
transferring the ink to a substrate by separating the screen mask and the substrate, which linearly contact each other. Screen printing is a method of applying ink onto a substrate that may use variations in the viscoelasticity of ink
Implementation Method 3
a bonding layer bonding the display panel and the window together
Data Source
AI summary
Provided is a display device including a display panel; and a window facing the display panel, a display area and a non-display area, which is around the display area, being on the window and the window including a transparent substrate, which has a first surface facing the display panel and a second surface opposite to the first surface, a bank layer, which is on the first surface of the transparent substrate along boundaries between the display area and the non-display area, and a printed pattern, which is in the non-display area of the transparent substrate and is located closer to an outer side of the window than is the bank layer.