Display Pad UV Curing via Reflection Layer
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Solution Overview
Problem
Existing display devices face issues with the non-cured state of adhesive layers, leading to potential air gaps and infiltration of undesired components, which can affect the luminance, transmittance, and visibility of the display.
Innovation Solution
Incorporating a reflection layer, such as one made of mirror silver ink, pearlescent pigment, or aluminum paste, between the printed layer and the adhesive layer to redirect UV light and ensure proper curing of the adhesive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a printed layer is located on the window overlapping the pad area, then the aesthetic appearance and design flexibility are improved, but the adhesive layer may remain in a non-cured state leading to air gaps and infiltration of undesired components
Solution Approach 1:
A reflection layer is introduced as an intermediary between the printed layer and the adhesive layer. This reflection layer redirects UV light downward to ensure proper curing of the adhesive layer in the pad area, while allowing the printed layer to maintain its design flexibility and aesthetic appearance on the window surface.
Solution Approach 2:
The solution addresses the curing issue by introducing a functional layer (reflection layer) in the vertical dimension between the printed layer and adhesive layer. This dimensional approach allows UV light to be redirected downward without compromising the horizontal design flexibility of the printed layer.
2Strength
If the adhesive layer is applied over the printed layer in the pad area, then the window and display panel are properly adhered, but UV light cannot penetrate effectively causing incomplete curing
Solution Approach 1:
The reflection layer serves as a mediator that redirects UV light downward through the adhesive layer to the display panel. This ensures that the adhesive layer receives sufficient UV exposure for complete curing while maintaining strong adhesion between the window and display panel.
Solution Approach 2:
The printed layer, which initially blocks UV light and causes curing problems, is combined with a reflection layer that redirects the blocked UV light downward. This converts the harmful UV blocking effect into a beneficial redirection mechanism that ensures complete adhesive curing.
3Device complexity
If no reflection layer is used, then the device structure is simpler, but the adhesive layer remains non-cured allowing dust and air gaps
Solution Approach 1:
The reflection layer acts as a necessary intermediary that enables complete adhesive curing. By redirecting UV light downward, it prevents the formation of non-cured adhesive regions that would otherwise allow dust infiltration and air gap formation, justifying the additional layer in the device structure.
Solution Approach 2:
The reflection layer provides beforehand protection by ensuring complete adhesive curing before the device is assembled and sealed. This prevents future issues with dust infiltration and air gaps that would occur if the adhesive remained non-cured.
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
Prevents the non-cured state of the adhesive layer, enhancing the luminance, transmittance, and visibility of the display while preventing air gaps and dust infiltration.
Implementation Method 1
Incorporating a reflection layer between the printed layer and the adhesive layer, which includes materials like mirror silver ink, pearlescent pigment, or aluminum paste, to redirect UV light and ensure proper curing of the adhesive layer.
Data Source
AI summary
A display device includes: a display panel including a display area and a pad area; a window disposed opposite to the display panel and covering the display area and the pad area; a printed layer located on a portion of the window overlapping the pad area; an adhesive layer located between the window and the display panel and covering at least a portion of an upper surface of the printed layer; and a reflection layer located between the printed layer and the adhesive layer.