Foldable Display Antenna Layout Using a Parasitic Metal Strip
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Solution Overview
Problem
The challenge of maintaining consistent antenna performance in foldable electronic devices, particularly when transitioning between open and folded states, due to interference and blocking by secondary screens and rotating shafts, which degrades radiation efficiency and isolation between antennas.
Innovation Solution
Incorporating a second metal strip on the secondary screen frame as a parasitic structure to enhance radiation efficiency and optimize antenna performance in the folded state by coupling with the primary screen's metal strip, and using filters to improve resonance and isolation in specific bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the flexible display is folded, then the device achieves compact portability, but the secondary screen blocks and interferes with the first metal strip antenna, degrading radiation efficiency and antenna performance
Solution Approach 1:
The patent introduces a rotating shaft as an intermediary component between the primary screen and secondary screen. This rotating shaft includes a first rotating shaft body and a second rotating shaft body that can rotate relative to each other, allowing the secondary screen to be positioned away from the first metal strip antenna during folded state, thereby reducing blocking and interference while maintaining compact form factor
Solution Approach 2:
The patent utilizes the rotational degree of freedom provided by the rotating shaft mechanism to change the spatial dimension of the secondary screen's position. By rotating the second rotating shaft body relative to the first rotating shaft body, the secondary screen can be positioned in different spatial locations, allowing it to avoid blocking the first metal strip antenna during folded state
2Device complexity
If the secondary screen is positioned close to the first metal strip antenna, then the device achieves compact structure, but the secondary screen causes interference and blocking, reducing radiation efficiency
Solution Approach 1:
The patent makes the secondary screen's position dynamic through the rotating shaft mechanism. The second rotating shaft body can rotate relative to the first rotating shaft body, allowing the secondary screen to dynamically adjust its position. During folded state, the secondary screen can be rotated to a position that minimizes blocking of the first metal strip antenna, thereby maintaining radiation efficiency while keeping the device structure compact
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
Enhances radiation efficiency and reduces performance differences between open and folded states by leveraging the secondary screen's metal strip as a parasitic element, improving antenna performance and maintaining resonance stability across various frequency bands.
Implementation Method 1
the second metal strip may be used as a parasitic structure of the first metal strip
Implementation Method 2
The first filter may have a function of filtering an electromagnetic signal in a low band and a GPS band
Data Source
AI summary
An antenna apparatus used in an electronic device having a flexible display, the flexible display can be bent at a rotating shaft, the flexible display includes a primary screen and a secondary screen respectively configured on two sides of the rotating shaft. The antenna apparatus may include a first metal strip disposed on the primary screen frame close to one end of the rotating shaft, and a second metal strip disposed on the secondary screen frame close to the same end of the rotating shaft. The first metal strip may be implemented as a plurality of antennas through dual-feed design. When the flexible display is in a folded state, the second metal strip may be coupled to the first metal strip to generate radiation. In this case, the second metal strip may be used as a parasitic antenna of the first metal strip.