Dual-Mode Display Using Invisible Light for Private Night Viewing

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Solution Overview

Problem

Display devices that only display visible light images lack privacy and visibility in dark environments, as they can be noticed by others and expose the user's position.

Innovation Solution

A display device incorporating both visible and invisible light display units, allowing a night vision mode for invisible image display and a normal mode for visible image display, ensuring privacy and secrecy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If visible light display units are used to display images, then users can view image information, but the display position and operation become noticeable to others, exposing user privacy

Engineering Contradiction:

ImproveprivacyVSAvoidvisibility

Core Design Contradiction:

Loss of informationVSIllumination intensity

Solution Approach 1:

The display device is segmented into two independent systems: visible light display units and invisible light display units. Each system can operate independently or simultaneously, allowing the device to switch between visible and invisible modes based on privacy requirements while maintaining display functionality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the wavelength parameter of the displayed light from visible range to invisible range (infrared or ultraviolet). By adjusting the light wavelength parameter, the display transitions from being visible to naked eyes to being invisible, thereby solving the privacy exposure problem while maintaining image display capability.

Inventive Principle:

Principle #35Parameter changes

2Loss of information

If visible light is used for display in dark environments, then users can view images, but the visible light exposes the user's position to others

Engineering Contradiction:

ImprovesecrecyVSAvoidlight emission

Core Design Contradiction:

Loss of informationVSIllumination intensity

Solution Approach 1:

Instead of using visible light for display, the patent inverts the approach by using invisible light (infrared or ultraviolet) for display in dark environments. This inversion allows users to view images without emitting visible light that would expose their position, thereby maintaining secrecy while enabling display functionality.

Inventive Principle:

Principle #13The other way round (Inversion)

3Loss of information

If viewing angle is reduced to provide privacy, then non-users cannot view private information, but complete privacy cannot be achieved and user experience is limited

Engineering Contradiction:

Improveprivacy protectionVSAvoidviewing flexibility

Core Design Contradiction:

Loss of informationVSAdaptability or versatility

Solution Approach 1:

The patent changes the fundamental parameter of light wavelength from visible to invisible range. This parameter change enables complete privacy protection because invisible light cannot be detected by human eyes regardless of viewing angle, thereby achieving absolute privacy while maintaining full viewing flexibility for authorized users through specialized devices.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12573332B2Display device and method for operating display device

Publication Date: 2026.03.10 INNOLUX CORP

AI summary

The present disclosure provides a display device and a method for operating the display device. The display device includes a night vision mode and a normal mode, and the display device includes a plurality of visible light display units and a plurality of invisible light display units. The method includes driving the visible light display units and turning off the invisible light display units in the normal mode, and driving the invisible light display units and turning off the visible light display units in the night vision mode.