Antenna Coil Placement Behind Display Shield Plate
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Solution Overview
Problem
Existing communication terminals face challenges in performing near field communication on the front surface due to obstructions like silicone covers and metal housings, which hinder antenna visibility and efficiency, especially when using IC cards or tablets, and current solutions using transparent conductive materials like ITO limit design freedom and communication quality.
Innovation Solution
A communication device with an interface that includes a display screen, a shield plate, and an antenna coil positioned between them, utilizing a magnetic sheet and a touch panel, allowing for efficient near field communication on the front surface while providing design flexibility and using high-conductivity materials like copper or aluminum for the antenna coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a transparent conductive material like ITO is used to form the antenna coil on the display screen, then near field communication can be performed on the front surface, but the conductivity is low (one hundredth or less than copper) and communication quality becomes inconsistent
Solution Approach 1:
A magnetic sheet is introduced as an intermediary between the antenna coil and the shield plate. This magnetic sheet enhances the magnetic flux density and improves communication quality without requiring the antenna coil to be made of transparent conductive material with low conductivity. The magnetic sheet acts as a mediator that amplifies the magnetic field generated by the antenna coil, thereby compensating for the low conductivity issue.
Solution Approach 2:
The patent changes the material parameter of the antenna coil from transparent conductive material (ITO) to high-conductivity metal materials such as copper or aluminum. This parameter change dramatically improves the conductivity and communication quality consistency. The antenna coil is formed by depositing these high-conductivity materials on the inner surface of the display screen, maintaining front surface communication capability while eliminating the conductivity limitation.
2Ease of operation
If the antenna coil is formed by depositing transparent conductive material on the display screen, then front surface communication is enabled, but the degree of freedom in antenna design is reduced
Solution Approach 1:
The magnetic sheet serves as a mediator that decouples the antenna coil design from the display screen constraints. By placing the magnetic sheet between the antenna coil and shield plate, the patent allows the antenna coil to be formed with high-conductivity materials in various patterns without being limited by the transparent substrate constraints, thereby restoring design freedom.
Solution Approach 2:
The patent employs a composite structure combining high-conductivity metal materials (copper or aluminum) for the antenna coil with a magnetic sheet. This composite material approach allows the antenna to achieve both high conductivity and flexible design, as the metal materials can be deposited in various configurations on the display screen inner surface without the limitations of transparent conductive materials.
3Strength
If a metal housing is used for the communication terminal, then structural strength is improved, but the communication area is reduced and communication may fail
Solution Approach 1:
The patent segments the housing structure by introducing a shield plate that is disposed at a specific position between the antenna coil and the external environment. This shield plate is formed with a through-hole or opening that allows magnetic flux to pass through, creating a segmented structure that maintains both mechanical strength and communication reliability. The shield plate divides the housing into regions that can be optimized for different functions.
Solution Approach 2:
The magnetic sheet acts as an intermediary that enhances the magnetic field penetration through the metal housing. By placing the magnetic sheet between the antenna coil and the shield plate, it amplifies the magnetic flux density, enabling reliable communication even through the metal housing structure. This intermediary compensates for the signal attenuation caused by the metal housing.
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
Enables efficient near field communication on the front surface of communication terminals with improved design freedom and communication quality, using high-conductivity materials for the antenna coil without compromising visibility or increasing manufacturing costs.
Implementation Method 1
an antenna coil that is disposed between the display device and the shield plate... configured to generate a magnetic flux that crosses the display screen
Implementation Method 2
a magnetic sheet that is disposed between the antenna coil and the shield plate
Data Source
AI summary
An antenna of a communication terminal is disposed on a side on which a bottom surface of a reflective plate, which is included in a display, is present. When the reflective plate is irradiated by an LED light source, the antenna cannot be seen from the side on which a display screen of the display is disposed. Accordingly, an antenna coil of the antenna does not need transparent electrodes and can be made of various materials each having a high conductivity. Therefore, the antenna has high sensitivity, low manufacturing cost, and very efficiently performs near field communication with an external device located on the display screen side of the display.