Flexible Antenna Package Layout for Low-Loss Display Connections

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Solution Overview

Problem

In image display devices, the increasing frequency of antenna driving signals leads to signal loss, and the bending of circuit boards for connection causes wiring damage and bonding failures due to stress, exacerbated by the decreasing thickness of these devices, necessitating an antenna package that maintains electrical reliability and radiation efficiency.

Innovation Solution

An antenna package featuring a flexible circuit board with a core layer, signal wiring, and a ground line, where the ground line is spaced apart from the signal wiring, and via structures connect the ground line and ground layer, preventing signal loss and interference, and omitting via structures in bending areas to avoid cracks and improve stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the antenna driving frequency is increased to achieve high frequency or ultra-high frequency band communication, then the communication capability is improved, but the signal loss is increased

Engineering Contradiction:

Improveantenna driving frequencyVSAvoidsignal loss

Core Design Contradiction:

SpeedVSLoss of energy

Solution Approach 1:

The circuit board is divided into a rigid circuit board portion and a flexible circuit board portion. The rigid portion provides stable electrical connection and grounding, while the flexible portion allows for bending without damage. This segmentation enables the antenna to operate at high frequencies with reduced signal loss by maintaining optimal electrical connection quality.

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If the circuit board is bent to connect to the driving integrated circuit chip, then the electrical connection is achieved, but the circuit wiring may be damaged and bonding failure may occur due to bending stress

Engineering Contradiction:

Improveelectrical connectionVSAvoidwiring integrity

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The circuit board is segmented into rigid and flexible portions. The flexible portion is specifically designed to accommodate bending stresses during connection to the driving integrated circuit chip, while the rigid portion maintains stable electrical connections. This segmentation allows the circuit board to achieve electrical connection without compromising wiring integrity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The flexible circuit board portion is designed with flexible materials and structures that can withstand bending stresses. This flexible portion acts as a buffer zone that absorbs mechanical stress during connection, preventing damage to circuit wirings and bonding failures while maintaining reliable electrical connection.

Inventive Principle:

Principle #30Flexible shells and thin films

3Volume of moving object

If the thickness of the image display device is decreased, then the device compactness is improved, but the degree of bending curvature of the circuit board increases, aggravating bending-related defects

Engineering Contradiction:

Improvedevice thicknessVSAvoidcircuit board reliability

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The circuit board is segmented into rigid and flexible portions with distinct functional roles. The flexible portion is specifically designed to handle the increased bending curvature resulting from reduced device thickness, while the rigid portion maintains structural stability and electrical connection reliability. This segmentation allows the device to achieve compactness without compromising circuit board reliability.

Inventive Principle:

Principle #1Segmentation

4Adaptability or versatility

If the length of the transmission path through the circuit board is increased, then the connection flexibility is improved, but the degree of signal loss is further increased

Engineering Contradiction:

Improveconnection flexibilityVSAvoidsignal loss

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The transmission path is segmented into portions on the rigid circuit board and portions on the flexible circuit board. The rigid portion provides stable, low-loss signal transmission, while the flexible portion provides connection adaptability. By optimizing the distribution of signal paths across both portions, the design achieves connection flexibility without excessively increasing signal loss.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11777192B2Antenna package and image display device including the same

Publication Date: 2023.10.03 DONGWOO FINE CHEM CO LTD

AI summary

An antenna package according to an embodiment of the present disclosure includes an antenna device including an antenna unit, and a flexible circuit board electrically connected to the antenna unit. The flexible circuit board has a bending area. The flexible circuit board includes a core layer having a first surface and a second surface facing each other, a signal wiring disposed on the first surface of the core layer and electrically connected to the antenna unit, a ground line disposed on the first surface of the core layer to be spaced apart from the signal wiring, a ground layer disposed on the second surface of the core layer, and a via structure penetrating a portion of the core layer in a region excluding the bending area and connecting the ground line and the ground layer with each other.