LED Array Authentication Using Optical Modulation and Multi-Pixel Sensing

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Solution Overview

Problem

Display-based authentication systems are vulnerable to interception by nefarious entities using strategically located cameras, and wireless communication methods like Bluetooth and Wi-Fi pose similar security risks, compromising the integrity of the authentication process.

Innovation Solution

An authentication system utilizing an optical data signal from a segmented LED array, focused by a lens onto a multi-pixel sensor, with temporal modulation, and verified by a controller, which compares the data to reference data to produce an authentication signal, optionally enhanced with a contact sensor for physical confirmation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If display-based authentication systems are used, then authentication can be performed, but security is compromised due to vulnerability to interception by cameras

Engineering Contradiction:

Improveauthentication securityVSAvoidinterception by cameras

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces display-based optical authentication with a camera flash-based optical modulation system. Instead of displaying authentication information on a screen that can be captured by cameras, the system uses a camera flash to emit modulated optical signals that are detected by a sensor, fundamentally changing the physical medium of authentication from display to active optical signaling.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent inverts the traditional authentication paradigm by using the camera flash (typically an illumination source) as the authentication signal source rather than using the display screen. The camera flash emits modulated optical signals that carry authentication data, and the sensor detects these signals, reversing the conventional approach of using display screens for authentication.

Inventive Principle:

Principle #13The other way round (Inversion)

2Adaptability or versatility

If wireless communication methods like Bluetooth and Wi-Fi are used for authentication, then authentication can be performed remotely, but security is compromised due to similar interception risks

Engineering Contradiction:

Improveremote authentication capabilityVSAvoidauthentication security

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent introduces an optical modulation intermediary that converts authentication data into modulated light signals. The camera flash acts as an intermediary device that encodes authentication information in the temporal modulation of light pulses, and the sensor serves as an intermediary detector that captures these modulated signals, creating a secure physical layer intermediary between the authentication source and the verification system.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If a lens is used to focus the optical data signal onto the multi-pixel sensor, then data reception accuracy is improved, but device complexity increases

Engineering Contradiction:

Improveoptical signal focusing accuracyVSAvoidoptical component count

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent uses a multi-pixel sensor array that segments the detection function across multiple independent pixels. Each pixel can detect optical signals from different spatial locations, allowing the system to receive and process multiple modulated optical signals simultaneously without requiring a single complex lens system, thus reducing overall device complexity while maintaining precision.

Inventive Principle:

Principle #1Segmentation

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

The system provides enhanced security by preventing display-based interception and achieving higher data rates than display-based systems, with improved security and reliability through bidirectional feedback.

Implementation Method 1

a lens disposed on or in the housing. The lens can at least partially focus the optical data signal onto the multi-pixel sensor such that the plurality of beams are at least partially focused onto different locations on the multi-pixel sensor

Methodology Applied

Scientific EffectLight focusing: Lens

Implementation Method 2

The multi-pixel sensor can produce an electrical data signal in response to the optical data signal

Methodology Applied

Scientific EffectPhotoelectric conversion: Photoelectric Effect

Data Source

PatentUS12602558B2Authentication and secure communication using LED array

Publication Date: 2026.04.14 LUMILEDS SINGAPORE PTE LTD

AI summary

In an authentication system, a housing can receive an optical data signal, such as a camera flash, from a user device, such as a smart phone. The optical data signal can include a plurality of beams propagating at different propagation angles from one another. At least one of the beams can include temporal modulation that corresponds to data. A lens disposed on or in the housing can at least partially focus the optical data signal onto a multi-pixel sensor such that the beams are at least partially focused onto different locations on the sensor. The sensor can produce an electrical data signal in response to the optical data signal. A controller can obtain the data from the electrical data signal, compare the data to reference data, determine that the data matches the reference data, and produce an authentication signal that indicates that the data matches the reference data.