Coplanar Waveguide Antenna in Non-Display Area

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Solution Overview

Problem

The integration of internal antennas in mobile terminals, such as those using transparent films on display panels, leads to increased thickness, compromised touch performance, and display quality due to antenna placement overlapping with display and touch areas, along with performance deviations caused by fabrication conditions and unstable ground voltages.

Innovation Solution

A display device with a coplanar waveguide structure antenna is placed in the non-display area of the panel, directly connected to a communication circuit unit, reducing thickness and performance deviations, and stabilizing ground voltage by forming the antenna using the same metal layer as the display panel and integrating a reflector for improved radiation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a transparent film antenna is attached to the display panel, then the antenna can be integrated into the mobile terminal, but the thickness of the display panel and mobile terminal increases

Engineering Contradiction:

Improveantenna integrationVSAvoidthickness

Core Design Contradiction:

Adaptability or versatilityVSLength of moving object

Solution Approach 1:

The antenna is merged with the display panel by forming it using the same metal layer process, eliminating the need for a separate transparent film antenna and reducing overall thickness

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The metal layer serves dual purposes: as part of the display panel structure and as the antenna element, allowing one component to fulfill multiple functions

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If the antenna pattern is disposed to overlap the display area and touch area, then the antenna can be integrated into the display panel, but the touch performance and display quality deteriorate

Engineering Contradiction:

Improveantenna integrationVSAvoidtouch performance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The display panel is segmented into a display area and a non-display area, with the antenna specifically placed in the non-display area to avoid interfering with touch performance and display quality

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If the antenna is formed using a separate transparent film, then the antenna can be attached to the display panel, but performance deviation increases due to fabrication condition differences

Engineering Contradiction:

Improveantenna integrationVSAvoidantenna performance consistency

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The antenna formation process is merged with the display panel metal layer process, ensuring that both structures are fabricated under identical conditions using the same equipment and materials, which eliminates performance deviations caused by separate fabrication processes

Inventive Principle:

Principle #5Merging (Combining)

4Device complexity

If the electrode of the display panel is used as the ground layer, then the ground layer can be shared, but the ground voltage becomes unstable

Engineering Contradiction:

Improveground layer structureVSAvoidground voltage stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The ground layer for the antenna is extracted from the display panel electrode and implemented as a separate dedicated ground layer, ensuring stable ground voltage independent of the display panel's electrical operations

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS11355863B2Display device including antenna and method of fabricating the same

Publication Date: 2022.06.07 LG DISPLAY CO LTD

AI summary

A display device includes: a substrate having a display area and a non-display area at a periphery of the display area; at least one unit antenna disposed in the non-display area on the substrate and having a coplanar wave guide structure; and a communication circuit unit transmitting and receiving a communication signal with the at least one unit antenna.