Antenna-Deco Film Stack for Display Wireless Communication
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Solution Overview
Problem
Display devices face challenges in achieving high-frequency and high-gain communication due to radiation interruption and impedance mismatching caused by conductive patterns and sensor members, which also affect image quality by making antennas visible.
Innovation Solution
An antenna-deco film stack structure is introduced, featuring a deco film with light-shielding and transmissive portions, an antenna pattern under the light-shielding portion, and a ground pattern on the dielectric layer to cover the antenna, allowing independent radiation control and reducing visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an antenna is combined with the display device to provide wireless communication function, then communication capability is improved, but radiation interruption and impedance mismatching occur due to conductive patterns and sensor members
Solution Approach 1:
The antenna structure is segmented into multiple layers including a first antenna pattern on the front substrate, a second antenna pattern on the rear substrate, and intermediate layers with conductive patterns. This segmentation allows each layer to contribute to radiation while maintaining signal integrity by distributing the antenna function across multiple discrete components rather than a single continuous structure.
Solution Approach 2:
A rear substrate is introduced as an intermediary layer between the front substrate containing the antenna pattern and the display device components. This rear substrate provides an additional ground plane and conductive patterns that act as intermediaries to improve impedance matching and reduce signal interruption from the display device's internal conductive structures.
2Adaptability or versatility
If the antenna is placed on the display device, then communication function is enabled, but the antenna becomes visible to users affecting image quality
Solution Approach 1:
The antenna structure is nested within the display device's multi-layer construction. The first antenna pattern is formed on the front substrate, the second antenna pattern on the rear substrate, with dielectric layers and conductive patterns in between. This nesting allows the antenna to be embedded within the display device structure rather than being a separate visible component.
Solution Approach 2:
Thin dielectric films and flexible substrate layers are used to enclose and protect the antenna patterns while maintaining the overall thin profile of the display device. These thin film structures allow the antenna to be integrated without adding significant thickness or visibility.
3Ease of operation
If conductive patterns such as TFT electrodes, scan lines, and data lines are present in the display device, then display functionality is achieved, but radiation interruption occurs affecting antenna performance
Solution Approach 1:
Ground patterns are strategically positioned on both the front and rear substrates to create equipotential regions that shield the antenna patterns from interference by the display device's conductive patterns. These ground patterns establish reference potential zones that reduce electromagnetic coupling between the display circuitry and antenna elements.
Solution Approach 2:
The conductive patterns in the antenna region are designed with locally optimized properties - the antenna patterns use specific trace widths, spacing, and geometries tailored for radiation, while the ground patterns use different configurations for shielding. This local quality differentiation allows simultaneous optimization of display functionality and antenna performance in different regions of the device.
Data Source
AI summary
An antenna-deco film stack structure includes a deco film including a light-shielding portion and a transmissive portion, a dielectric layer facing the deco film, an antenna pattern disposed on an upper surface of the dielectric layer and disposed under the deco film, the antenna pattern being at least partially covered by the light-shielding portion, and a ground pattern on a lower surface of the dielectric layer to at least partially cover the antenna pattern. The deco film and the antenna pattern are combined to improve radiation reliability and optical property of the antenna pattern. A display device including the antenna-deco film stack structure is also provided.