IR LED Switching Circuit for Dual-Mode Signal Relay and Detection

Solution Overview

Problem

Display devices require separate IR receivers to detect IR signals in specific frequency bands for controlling external devices, increasing complexity and cost.

Innovation Solution

Incorporating a first and second switching circuit, a gain circuit, and a filter circuit with an IR LED to detect and transmit IR signals, eliminating the need for additional IR receivers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a separate IR receiver is added to detect IR signals in a specific frequency band, then the display device can control external devices, but the device complexity and manufacturing cost increase

Engineering Contradiction:

ImproveIR signal reception capabilityVSAvoidcircuit configuration complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent makes the IR LED perform dual functions: transmitting IR signals to external devices and receiving/detecting IR signals from remote controls. By adding switching circuits, the same hardware component (IR LED) serves both transmission and reception purposes, eliminating the need for a separate IR receiver and reducing overall device complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines the transmission and reception functions into a single IR LED component. The switching circuits enable the IR LED to be dynamically configured for either transmitting or receiving mode, merging what would traditionally require separate components into one integrated solution

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If a separate IR receiver is added to detect IR signals in a specific frequency band, then the display device can control external devices, but the manufacturing cost increases

Engineering Contradiction:

ImproveIR signal reception capabilityVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent makes the IR LED perform dual functions: transmitting IR signals to external devices and receiving/detecting IR signals from remote controls. By adding switching circuits, the same hardware component (IR LED) serves both transmission and reception purposes, eliminating the need for a separate IR receiver and reducing overall device complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines the transmission and reception functions into a single IR LED component. The switching circuits enable the IR LED to be dynamically configured for either transmitting or receiving mode, merging what would traditionally require separate components into one integrated solution

Inventive Principle:

Principle #5Merging (Combining)

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

Simplifies circuit configuration and reduces manufacturing costs by utilizing the IR LED's transmission and reception characteristics to control power states based on detected IR signals.

Implementation Method 1

an IR LED configured to transmit a second IR signal based on the first IR signal to an external device

Methodology Applied

Scientific EffectLight Emitting Diode: Light Emitting Diode

Implementation Method 2

receive a third IR signal from a second remote control

Methodology Applied

Scientific EffectInfrared detection: Infrared Radiation

Data Source

PatentUS12574584B2Display device, and method for controlling device on basis of IR signal received using IR led

Publication Date: 2026.03.10 SAMSUNG ELECTRONICS CO LTD

AI summary

A display device including: an IR receiver configured to receive a first IR signal from a first remote control; an IR LED configured to transmit a second IR signal based on the first IR signal to an external device or receive a third IR signal from a second remote control; a first switching circuit and a second switching circuit connected to respective ends of the IR LED; a gain circuit and a filter circuit connected in sequence to the first switching circuit; and at least one processor configured to set a switching path to transmit the second IR signal or detect the third IR signal.