Antenna Device for Display with Dual-Surface Pattern
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Solution Overview
Problem
Existing display devices with integrated near field communication antennas face challenges in maintaining effective wireless communication due to increased parasitic capacitance and deteriorated antenna performance when the communication device is placed on the display surface, which also affects viewability and yield.
Innovation Solution
The antenna device features an antenna substrate with a first and second antenna pattern formed on opposite surfaces, allowing for reduced resistance and improved performance without increasing thickness, by forming a mesh metal pattern that transmits images and is less noticeable, and utilizing a flexible printed circuits board for connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the communication device is provided on the display surface side of the display device, then the distance between the non-contact type IC card and the communication device can be reduced, but the parasitic capacitance between the antenna and the display panel increases and the antenna performance deteriorates
Solution Approach 1:
The patent transitions from a single-layer antenna structure to a three-dimensional stacked configuration with antenna patterns on both the front and back surfaces of the antenna substrate. This spatial arrangement reduces parasitic capacitance by distributing the antenna structure across multiple dimensions while maintaining effective communication distance.
Solution Approach 2:
The patent applies different antenna patterns (first and second antenna patterns) on opposite surfaces of the antenna substrate, with each pattern optimized for its specific location. The patterns are designed to coincide in position when viewed from opposite sides, creating localized electromagnetic field enhancement while reducing overall parasitic capacitance.
2Reliability
If a thick conductor is formed to reduce resistance and improve antenna performance, then the antenna performance improves, but the variation of thickness increases and the yield decreases and the viewability of the image is deteriorated
Solution Approach 1:
The patent divides the antenna conductor into two separate patterns located on opposite surfaces of the antenna substrate. Each pattern is formed with standard thickness, avoiding the need for thick conductors. The segmented structure achieves reduced overall resistance while maintaining manufacturing precision and yield.
3Reliability
If a thick conductor is formed to reduce resistance, then the resistance decreases and antenna performance improves, but the viewability of the image is deteriorated
Solution Approach 1:
The patent uses a stacked antenna configuration with patterns on both front and back surfaces, allowing the antenna structure to achieve low resistance through spatial distribution rather than increasing conductor thickness. This maintains the transparency and viewability of the display surface while improving antenna performance.
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 while maintaining image viewability and yield, achieving EMVCo performance standards by reducing resistance and maintaining thinness, thus improving near field communication efficiency.
Implementation Method 1
the communication device has a power supply, and supplies power to the near field communication antenna element built in the communication device, which may lead to generation of a magnetic field by the antenna element. Then, by bringing the non-contact type IC card close to the communication device, the magnetic field is generated by the communication device, and thus an induced current flows through the antenna element of the non-contact type IC card.
Implementation Method 2
at least a part of the antenna substrate is transparent to transmit an image
Data Source
AI summary
There are provided an antenna device with improved antenna performance while suppressing a decrease in yield and a decrease in viewability, and a display device including the same. The antenna device includes an antenna substrate, a first antenna pattern formed on a first main surface of the antenna substrate, and a second antenna pattern formed on a second main surface opposite to the first main surface of the antenna substrate. The first antenna pattern and the second antenna pattern are formed such that positions on the front and back of the antenna substrate coincide with each other, and at least a part of the antenna substrate is transparent to transmit an image.