Display Bluetooth Role Switching for Stable Speaker Mode

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Solution Overview

Problem

Existing display devices experience performance deterioration due to channel movement through adaptive frequency hopping when operating as both a master and slave device in Bluetooth audio sink operations, leading to issues such as stopped cursor movement and audio output interruptions.

Innovation Solution

The display device includes a Bluetooth module, an IR module, and a controller that breaks Bluetooth connection with the remote control device upon entering speaker mode to prevent performance degradation, allowing seamless audio output from a mobile terminal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the display device operates as both a master device and a slave device in Bluetooth communication, then it can simultaneously control a remote control device and receive audio from a mobile terminal, but performance deteriorates due to channel movement through adaptive frequency hopping

Engineering Contradiction:

Improvedual Bluetooth role capabilityVSAvoidcursor movement stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent segments the Bluetooth communication roles by separating the master device function (for remote control) and slave device function (for audio reception). The controller selectively switches between these roles based on operational mode, preventing simultaneous execution that causes channel conflicts and frequency hopping issues.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If the display device operates as both a master device and a slave device in Bluetooth communication, then it can simultaneously control a remote control device and receive audio from a mobile terminal, but audio output is interrupted due to channel movement through adaptive frequency hopping

Engineering Contradiction:

Improvedual Bluetooth role capabilityVSAvoidaudio output continuity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If the display device maintains Bluetooth connection with both remote control device and mobile terminal, then it supports multiple functions, but channel movement through adaptive frequency hopping causes performance deterioration

Engineering Contradiction:

Improvemulti-device connectivityVSAvoidsystem performance

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent implements dynamic role switching where the controller adapts its Bluetooth master/slave status based on the current operational mode. When in speaker mode, it becomes a slave device; when in remote control mode, it becomes a master device. This dynamic adaptation eliminates channel conflicts while maintaining multi-device connectivity capability.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP3651472B1Display device

Publication Date: 2025.12.03 LG ELECTRONICS INC

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AI summary

A display device includes a display unit, a Bluetooth module configured to perform Bluetooth communication with a remote control device or a mobile terminal, an IR module configured to receive an IR signal from the remote control device, and a controller configured to control the display unit, the Bluetooth module and the IR module. The controller may transmit, to the remote control device, a Bluetooth connection stop request signal for breaking Bluetooth connection with the remote control device, if the display device enters a speaker mode for outputting audio played by the mobile terminal.