Mesh Antenna Element Structure for Moire-Safe Display Overlap
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Solution Overview
Problem
In the development of 5G mobile communication devices, the limited space for antennas due to larger display screens leads to overlapping with the display area, causing visibility issues and reduced image quality due to the antenna's electrode pattern, which existing transparent antenna solutions fail to adequately address.
Innovation Solution
An antenna element with a dielectric layer featuring a radiation electrode and a dummy electrode, both with specific mesh structures, arranged to minimize visibility and maximize transmittance and signal sensitivity, where the electrodes are spaced apart and have a high aperture ratio, ensuring reduced visibility and improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the antenna electrode is made transparent or translucent in a mesh pattern structure, then the transmittance is improved, but the electrode pattern becomes visually recognizable due to moire phenomenon, reducing image quality
Solution Approach 1:
The antenna electrode is divided into multiple segments arranged in a mesh pattern structure, where the electrode is segmented into multiple independent conductive regions separated by transparent spaces. This segmentation reduces the continuous electrode pattern visibility while maintaining electrical functionality through the distributed mesh structure.
Solution Approach 2:
Different regions of the antenna electrode are designed with varying mesh densities and patterns. The mesh structure parameters (line width, spacing, cell size) are locally optimized to balance transmittance requirements in display areas with antenna performance requirements in non-display areas, creating spatially varying local qualities.
2Area of stationary object
If the radiation electrode overlaps the display area to save space, then the device size is reduced, but the image quality deteriorates due to coverage by the electrode pattern
Solution Approach 1:
The mesh pattern parameters are locally adjusted based on the spatial position. In display areas, the mesh has larger openings and thinner lines to maximize transmittance and minimize visibility. In non-display areas, the mesh can have denser patterns optimized for antenna performance. This local quality variation allows the antenna to overlap the display area without significantly degrading image quality.
3Object-affected harmful factors
If the mesh pattern opening area is increased to reduce visibility, then the transmittance is improved, but the antenna sensitivity deteriorates
Solution Approach 1:
The mesh pattern parameters (line width, spacing, opening area, cell geometry) are precisely controlled within specific ranges to achieve optimal balance. The line width is maintained within 0.5-5 μm, and the opening area ratio is controlled between 70-90%, ensuring both reduced visibility and adequate signal sensitivity. Small parameter changes in these critical ranges significantly affect both transmittance and antenna performance.
Solution Approach 2:
The antenna electrode uses composite material structures, such as transparent conductive oxides (ITO, IZO, ITZO) combined with metal layers, to achieve both high transmittance and adequate electrical conductivity. This composite approach allows the mesh pattern to have sufficient conductive properties for signal reception while maintaining optical transparency.
Data Source
AI summary
The present disclosure relates to an antenna element including: a dielectric layer; a radiation electrode arranged on an upper surface of the dielectric layer and including a first mesh structure; and a dummy electrode arranged on the upper surface of the dielectric layer and including a second mesh structure, in which at least one of the radiation electrode and the dummy electrode satisfies Equation 1, and an image display device including the same.