In-Display Radar Antenna Layout With Lower Feed Loss
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Solution Overview
Problem
Existing electronic devices face challenges in efficiently integrating radar systems with display panels due to issues of increased dead space and feed loss when using antenna-in-package (AiP) or in-display type radar configurations, which affect the active area and performance of the display.
Innovation Solution
A novel configuration where the radar circuit is separated into a signal processing circuit on the first circuit board and a front-end circuit on the connection board, with the antenna array overlapping the display panel, reducing feed loss and dead space by optimizing the placement and connection of these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If antenna-in-package (AiP) or in-display type radar configurations are used, then radar integration with display panel is achieved, but dead space increases and feed loss occurs
Solution Approach 1:
The radar system is segmented into separate functional modules: the antenna array is disposed on the display panel while the radar circuit is placed on a separate circuit board connected via connection boards. This segmentation allows independent optimization of each component's position and function, reducing feed loss by separating the antenna from the circuit while maintaining integration benefits.
Solution Approach 2:
The antenna array is disposed to overlap the display panel in a spatial arrangement that utilizes the z-dimension (depth/overlap dimension) rather than occupying planar space on the display surface. This dimensional approach reduces dead space while maintaining effective antenna-circuit coupling through the connection boards.
2Adaptability or versatility
If antenna-in-package (AiP) or in-display type radar configurations are used, then radar integration with display panel is achieved, but dead space increases
Solution Approach 1:
By segmenting the radar system into antenna array (on display panel) and radar circuit (on separate circuit board), the design avoids the need for large integrated AiP packages that consume display area, thus reducing dead space while maintaining radar functionality.
Solution Approach 2:
The antenna array overlaps the display panel in the vertical dimension rather than occupying horizontal display area, effectively utilizing the z-dimension to reduce dead space on the display surface while maintaining antenna functionality.
3Loss of energy
If radar circuit is integrated close to antenna array, then feed loss is reduced, but design flexibility and maintenance become difficult
Solution Approach 1:
The radar system is divided into modular components (antenna array, connection boards, radar circuit) that can be independently designed, manufactured, and assembled. This modular segmentation maintains manageable feed loss through optimized connection paths while significantly improving design flexibility and maintenance capability.
Solution Approach 2:
Connection boards serve as intermediaries between the antenna array and radar circuit, providing optimized signal transmission paths that minimize feed loss while allowing independent placement and design of the antenna and circuit components, thus maintaining design flexibility.
Data Source
AI summary
An electronic device includes: a display panel including pixels; an antenna array disposed to overlap the display panel; a connection board coupled to a side of the display panel; a display driver circuit on the connection board and configured to drive the pixels to display a screen on the display panel; a main printed circuit board; a flexible printed circuit board extending to connect between the main printed circuit board and the connection board; a signal processing circuit on the main printed circuit board; a first front end circuit on the connection board to be on a first side of the display driver circuit, and operatively connected to the signal processing circuit and the antenna array; and a second front end circuit on the connection board to be on a second side of the display driver circuit, and operatively connected to the signal processing circuit and the antenna array.