Rear Bezel Antenna Coil for LCD Interference Reduction

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Solution Overview

Problem

Existing liquid crystal display devices with integrated antenna coils face challenges such as increased complexity and thickness due to the use of additional parts like printed wiring boards or films, which can be improved upon.

Innovation Solution

A liquid crystal display device design that incorporates an antenna coil within the rear bezel, electrically insulated from the front bezel and outer edge, allowing for reduced part count and flexibility in coil placement, with options for bonding to the backlight or magnetic sheet, and integration with a flexible circuit board for control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If an antenna coil is installed using a printed wiring board or film, then the antenna coil can be integrated into the terminal, but the number of processes increases and the thickness inside the terminal increases

Engineering Contradiction:

Improveantenna coil integrationVSAvoidnumber of processes

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines the antenna coil directly with the rear bezel structure, eliminating the need for separate printed wiring boards or films. The rear bezel itself serves as the substrate for mounting the antenna coil, thereby reducing the number of components and assembly processes while maintaining antenna integration functionality

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The rear bezel is designed to serve multiple functions: it provides structural support for the display device, houses the backlight, and simultaneously serves as the mounting structure for the antenna coil. This multi-functionality reduces the need for additional dedicated components

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If an antenna coil is installed using a printed wiring board or film, then the antenna coil can be integrated into the terminal, but the thickness inside the terminal increases

Engineering Contradiction:

Improveantenna coil integrationVSAvoidthickness inside terminal

Core Design Contradiction:

Adaptability or versatilityVSLength of stationary object

Solution Approach 1:

By merging the antenna coil mounting function directly into the rear bezel structure, the patent eliminates additional thickness-contributing layers such as separate printed wiring boards or films. The antenna coil is mounted on the rear bezel's inner surface, utilizing the existing structural thickness rather than adding to it

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The antenna coil is positioned on the inner surface of the rear bezel, utilizing the depth dimension of the bezel structure rather than requiring additional thickness in the display assembly direction. This dimensional arrangement allows antenna integration without increasing overall device thickness

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If the antenna coil is disposed near one end of the display device, then the antenna can function for NFC communication, but the metal components may cause interference

Engineering Contradiction:

ImproveNFC communication functionVSAvoidinterference from metal components

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a resin layer as an intermediary substance between the antenna coil and the metal components of the rear bezel. This resin layer acts as an electromagnetic shield and insulator, preventing harmful interference from the metal components while allowing the antenna coil to maintain its NFC communication function

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent converts the potentially harmful electromagnetic interference from metal components into a beneficial arrangement by strategically positioning the antenna coil near metal components and using resin insulation. The controlled proximity allows for compact design while the resin layer ensures interference-free operation, turning a potential problem into a design advantage

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design reduces the number of parts used, maintains flexibility in antenna coil placement, and enhances communication performance by minimizing interference from metal components, thus improving the overall efficiency and usability of the liquid crystal display device.

Implementation Method 1

RFID utilizes an electromagnetic induction system, which enables contactless transfer of energy or signals between antennas by electromagnetic induction

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS11296397B2Liquid crystal display device including antenna coil

Publication Date: 2022.04.05 SHARP KK

AI summary

A liquid crystal display device including an antenna coil is provided. The device includes a liquid crystal panel; a backlight; and a bezel. The bezel includes a front bezel and a rear bezel, and houses the liquid crystal panel and the backlight using the front bezel and the rear bezel in combination. The front bezel is disposed on a liquid crystal panel side and provided with an opening superposed on a display region of the liquid crystal panel. The rear bezel is disposed on a backlight side and includes an antenna coil formed form a conductive material and an outer edge positioned outside the antenna coil in a plan view. The antenna coil is electrically insulated from the front bezel and the outer edge of the rear bezel.