UV Absorber Layer in Display Sensor Adhesion
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Solution Overview
Problem
Display devices are vulnerable to damage from ultraviolet rays during manufacturing, particularly when attaching sensors, which can lead to reliability issues and staining due to the penetration of UV light through adhesive layers containing organic materials.
Innovation Solution
Incorporating an ultraviolet absorber, such as benzophenone-based or benzotriazole-based compounds, in auxiliary layers or films within the display device structure to block UV radiation, and using a non-overlapping adhesive layer to prevent direct UV exposure to the sensor and display panel during attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ultraviolet rays are used to cure the adhesive layer for attaching the sensor, then the adhesive bonding strength is improved, but the display panel components (light emitting layer, thin film transistor) are damaged due to UV penetration
Solution Approach 1:
An ultraviolet absorber layer is introduced as an intermediary component between the adhesive layer and the display panel. This layer absorbs UV radiation before it reaches the light emitting layer and thin film transistors, allowing UV curing of the adhesive while protecting the panel components from damage
Solution Approach 2:
The adhesive attachment system is segmented into multiple functional layers: the adhesive layer for bonding, the ultraviolet absorber layer for UV protection, and the auxiliary layer for structural support. This segmentation allows each layer to perform its specific function without interfering with others
2Ease of manufacture
If ultraviolet rays penetrate through the adhesive layer, then the adhesive curing is achieved, but staining occurs on the display panel
Solution Approach 1:
The ultraviolet absorber layer serves as a mediator that intercepts UV rays before they reach the display panel surface. This prevents the staining effect while still allowing the UV curing process to occur in the adhesive layer
Solution Approach 2:
The potentially harmful UV radiation that causes staining is converted into a beneficial effect by using it to cure the adhesive layer, while the ultraviolet absorber layer captures any excess UV energy that would otherwise cause damage or staining
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 UV-induced damage to the display panel's light-emitting layers and thin film transistors, enhancing the reliability and preventing staining, while allowing for secure sensor attachment without requiring UV curing processes.
Implementation Method 1
an auxiliary layer disposed on the second side of the display area and including an opening, a sensor overlapping the opening, and an adhesive layer connected between the sensor and the auxiliary layer... an ultraviolet (UV) absorbing film configured to block UV radiation from being irradiated into the display panel
Data Source
AI summary
A display device including a display panel having a first side including a display area configured to emit light and a second side opposite to the first side, a sensor having a first surface facing the display panel, a first adhesive layer disposed between the first surface of the sensor and the display panel, and a second adhesive layer disposed on a side surface of the sensor, in which the second adhesive layer and the first adhesive layer contact each other.