Foldable Display Antenna Coupling to Reduce Folded-State Radiation Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Foldable electronic devices with flexible displays face challenges in maintaining consistent antenna performance between the open and folded states, leading to deteriorated radiation efficiency and increased differences in antenna performance due to blocking effects from the secondary screen and rotating shaft.
Innovation Solution
Incorporating a second metal strip on the secondary screen frame that acts as a parasitic structure to the first metal strip on the primary screen frame, coupled during the folded state to enhance radiation efficiency and optimize antenna performance across various bands, including low and GPS bands, by using filters to improve resonance and isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a first metal strip is disposed on a primary screen frame for antenna radiation, then antenna radiation function is provided, but when the flexible display is folded, the secondary screen and rotating shaft block the radiation path causing deteriorated radiation efficiency
Solution Approach 1:
A second metal strip is introduced as an intermediary parasitic element on the secondary screen frame. This second metal strip acts as a mediator to extend the radiation path around the blocking objects (secondary screen and rotating shaft), allowing electromagnetic energy to be rerouted through the parasitic structure rather than being blocked, thus maintaining radiation efficiency in folded state
Solution Approach 2:
The antenna structure transitions from a two-dimensional planar configuration on the primary screen frame to a three-dimensional spatial configuration by adding the second metal strip on the secondary screen frame. This dimensional extension creates alternative radiation paths in space that bypass the blocking objects, resolving the contradiction between maintaining antenna function and avoiding blockage
2Adaptability or versatility
If the flexible display is folded to achieve compact form factor, then portability is improved, but the difference between antenna performance in folded state and open state increases
Solution Approach 1:
The second metal strip serves multiple functions: it acts as a parasitic element for the first antenna, provides a radiation path extension, and functions as a grounding structure. This multi-functionality allows the antenna system to maintain consistent performance across different display states without requiring separate antenna configurations for folded and open states
Solution Approach 2:
The antenna system is designed to dynamically adapt to the flexible display's state changes. The second metal strip's parasitic characteristics automatically adjust based on the proximity and coupling between the first and second metal strips, allowing the system to maintain optimal radiation performance whether the display is folded or open
3Device complexity
If multiple antennas share the same metal strip structure, then device complexity is reduced, but isolation between antennas deteriorates
Solution Approach 1:
The single metal strip structure is segmented into functionally independent regions: the first metal strip serves as the primary radiating element, while the second metal strip serves as a parasitic element and grounding structure. This segmentation allows multiple antennas to share the overall structure while maintaining electrical isolation through the grounding points and spatial separation, resolving the contradiction between structural simplicity and antenna isolation
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 solution effectively improves the radiation efficiency and antenna performance of the first metal strip in the folded state, reducing the performance difference between open and folded states, and enhances the isolation between antennas, thereby maintaining reliable communication across different bands.
Implementation Method 1
the second metal strip may be used as a parasitic structure of the first metal strip
Implementation Method 2
When the flexible display is in the folded state, the first metal strip may be coupled to the second metal strip to generate radiation in the radiation band of the first antenna
Implementation Method 3
An operating band of the first filter may include a radiation band (for example, a low band) of the first antenna and a radiation band (for example, a GPS band) of the second antenna
Data Source
AI summary
An antenna apparatus used in an electronic device having a flexible display that can be bent at a rotating shaft and that includes a primary screen and a secondary screen respectively configured on two sides of the rotating shaft. The antenna apparatus includes 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 is implemented as a plurality of antennas through dual-feed design. When the flexible display is in a folded state, the second metal strip is coupled to the first metal strip to generate radiation and is used as a parasitic antenna of the first metal strip.