Display Device Identity via Reflection Pattern Extraction

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Solution Overview

Problem

Face detection algorithms for identifying users of display devices, such as smartphones, become less reliable when the front camera is covered by the display, leading to unreliable assessment of eligibility for using the device.

Innovation Solution

A system that projects an illumination pattern through the display of a display device onto an object and images the illuminated object through the display, extracting a reflection pattern to determine the identity of the display device, thereby assessing its eligibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the front camera is covered by the display to improve security or prevent unauthorized access, then device security is improved, but face detection reliability deteriorates

Engineering Contradiction:

Improvedevice securityVSAvoidface detection reliability

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent introduces a reflection pattern as an intermediary element that carries information about the display device's optical characteristics. Instead of directly observing the user's face through the covered camera, the system uses the reflection pattern of the illumination pattern projected through the display as a mediator to identify the display device, thereby maintaining security while enabling identification.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the mechanical/optical direct viewing approach (face detection through the camera) with an optical interference-based approach (reflecting illumination patterns through the display). By substituting the direct face detection mechanism with a pattern reflection mechanism, the system can identify display devices without compromising the security provided by the covered camera.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If the front camera is covered by the display, then unauthorized access is prevented, but user identification capability deteriorates

Engineering Contradiction:

Improveunauthorized access preventionVSAvoiduser identification capability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The reflection pattern serves as an intermediary that enables user identification without requiring direct access to the covered camera. The illumination pattern projected through the display creates a reflection pattern that carries display-specific optical characteristics, allowing the system to identify both the display device and the user indirectly, thus maintaining ease of operation while preserving security.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If face detection algorithms are used for user identification, then user identification is simplified, but system reliability deteriorates when display covers the camera

Engineering Contradiction:

Improveuser identification simplicityVSAvoididentification reliability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent substitutes the conventional face detection algorithm approach with an optical pattern reflection approach. Instead of using complex algorithms to analyze facial features through a covered camera, the system uses the reflection of illumination patterns through the display to obtain reliable optical characteristics of the display device, thereby improving reliability while maintaining operational simplicity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 approach allows for reliable identification and eligibility assessment of display devices by utilizing the optical characteristics of the display, even when the front camera is covered, thereby enhancing security and authentication processes.

Implementation Method 1

projecting an illumination pattern through a display of the display device onto the object and imaging the illuminated object through the display

Methodology Applied

Scientific EffectLight transmission through display: Light

Implementation Method 2

extracting a reflection pattern corresponding to the illumination pattern from the image

Methodology Applied

Scientific EffectReflection pattern extraction: Reflection

Data Source

PatentUS20250095405A1System for identifying a display device

Publication Date: 2025.03.20 TRINAMIX GMBH

AI summary

Disclosed herein is a system for identifying a display device, where the system includes i) an image providing unit for providing an image of an object that has been acquired by projecting an illumination pattern through a display of the display device onto the object and imaging the illuminated object through the display. The system further includes ii) a reflection pattern extracting unit for extracting a reflection pattern corresponding to the illumination pattern from the image, and iii) an identity determining unit for determining an identity of the display device based on the reflection pattern.