Display-Overlapping Antenna Adhesive Stack for Thin Electronics
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Solution Overview
Problem
Existing electronic devices with integrated antennas face challenges in optimizing antenna performance while maintaining mechanical and electrical properties, particularly due to the placement of antennas overlapping display panels and the need for adhesive layers with specific dielectric constants and loss values.
Innovation Solution
The electronic device incorporates a dual adhesive layer system between the antenna and the display panel, with a first adhesive layer having a lower dielectric constant and loss value to improve antenna characteristics, and a second adhesive layer with higher properties to satisfy mechanical requirements. Additionally, the circuit film is electrically connected to the antenna through an opening in a window layer, which is disposed between the antenna and the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single adhesive layer is used between the antenna and display panel, then the structure is simple, but the antenna performance cannot be optimized while satisfying both mechanical and electrical requirements
Solution Approach 1:
The adhesive layer between the antenna and display panel is divided into two separate adhesive layers with different dielectric constants. The first adhesive layer (closer to antenna) has a lower dielectric constant to improve antenna characteristics, while the second adhesive layer (closer to display panel) has a higher dielectric constant to ensure mechanical bonding strength. This segmentation allows each layer to be optimized for its specific function.
Solution Approach 2:
Different regions of the adhesive system are assigned different dielectric constants to meet local requirements. The first adhesive layer uses material with lower dielectric constant (e.g., 2.5-3.5) for electrical performance, while the second adhesive layer uses material with higher dielectric constant (e.g., 3.0-4.0) for mechanical performance. This local differentiation resolves the contradiction between electrical and mechanical requirements.
2Length of moving object
If the antenna is disposed close to the display panel to reduce device thickness, then the device is thinner, but the antenna performance deteriorates due to increased coupling with the ground
Solution Approach 1:
The dielectric constant parameter of the adhesive layers is changed to optimize antenna performance. By using a lower dielectric constant material in the first adhesive layer (closer to the antenna), the electrical coupling between the antenna and ground is reduced, improving antenna characteristics even when the antenna is disposed close to the display panel. This parameter change allows thin device design without sacrificing antenna performance.
3Reliability
If adhesive layers with low dielectric constant are used to improve antenna characteristics, then the antenna performance is enhanced, but the mechanical bonding strength may be insufficient
Solution Approach 1:
The adhesive system is segmented into two layers with different material properties. The first adhesive layer uses low dielectric constant material for antenna performance, while the second adhesive layer uses higher dielectric constant material for mechanical strength. This segmentation allows each layer to specialize in one function without compromising the other.
Solution Approach 2:
The adhesive system employs composite material construction with two different adhesive materials having different dielectric constants. This composite approach combines the electrical benefits of low dielectric constant materials with the mechanical benefits of higher strength materials, resolving the contradiction between electrical and mechanical performance requirements.
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
This configuration enhances antenna performance by optimizing the distance between the antenna and the ground, while also improving mechanical reliability and minimizing the risk of bubbles and reliability issues between the anti-reflection film and the antenna.
Implementation Method 1
A dielectric constant of the first adhesive layer may be lower than a dielectric constant of the second adhesive layer
Implementation Method 2
The antenna may transmit and receive signals in a specific frequency range
Implementation Method 3
a first adhesive layer disposed between the display panel and the antenna; and a second adhesive layer disposed between the first adhesive layer and the display panel
Data Source
AI summary
An electronic device includes a display panel, an antenna, and a circuit film. The antenna overlaps the display panel. The antenna includes an antenna base film having a first surface and a second surface opposite each other. The first surface is disposed between the display panel and the second surface. The antenna further includes an antenna pattern, an antenna feed line, and an antenna pad each being disposed on the first surface. The antenna pattern is electrically connected through the antenna feed line to the antenna pad. The circuit film is electrically connected to the antenna pad.