Anti-peeping Display Using Rotating Grating Mirror

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Solution Overview

Problem

Conventional anti-peeping solutions for displays, such as attaching anti-peeping display films, are costly and interfere with the normal display effect, failing to effectively prevent unauthorized viewing while maintaining user visibility.

Innovation Solution

An anti-peeping device comprising an external light source and a grating mirror structure, controlled to reflect light away from the display's normal viewing angle, ensuring that light emitted from the display is redirected towards potential peepers, thereby preventing them from seeing the displayed content without affecting the main viewing region.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If anti-peeping display films are attached to the display, then unauthorized viewing is prevented, but the normal display effect is interfered with and cost increases

Engineering Contradiction:

Improveanti-peeping effectVSAvoiddisplay cost and quality

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The display surface is segmented into multiple viewing regions with different optical properties. The anti-peeping structure is divided into multiple independent units that can be selectively positioned, allowing the display to maintain normal viewing quality in the main region while providing anti-peeping protection in specific directions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the display have different optical characteristics. The anti-peeping structures are locally positioned at specific areas rather than covering the entire display surface, ensuring that the main viewing area maintains its original display quality while anti-peeping functionality is provided where needed.

Inventive Principle:

Principle #3Local quality

2Reliability

If anti-peeping display films are used, then privacy is protected, but the display effect for normal users is degraded

Engineering Contradiction:

Improveprivacy protectionVSAvoiddisplay brightness and clarity

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

Instead of blocking light from reaching peepers directly, the invention inverts the approach by using reflective structures to redirect ambient light toward peepers, creating a glare effect that obscures the display content for unauthorized viewers while maintaining normal viewing experience for legitimate users.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The invention converts ambient light, which could potentially reveal display content to peepers, into a beneficial element by reflecting it toward the peepers to create glare and obscuration. This transforms the harmful effect of ambient light into a protective mechanism for privacy.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If the grating mirror structure covers a larger area, then anti-peeping effectiveness increases, but the light emitting area of the display decreases

Engineering Contradiction:

Improveanti-peeping effectivenessVSAvoidlight emitting area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The anti-peeping grating mirror structures are positioned to cover only specific portions of the display surface rather than the entire area. This partial coverage is sufficient to prevent peeping from common unauthorized viewing angles while preserving the majority of the light emitting area for normal display functionality.

Inventive Principle:

Principle #16Partial or excessive action

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 solution effectively achieves anti-peeping by redirecting light towards potential viewers, ensuring privacy without compromising the user's viewing experience, and can be adjusted to vary the anti-peeping effect based on the grating mirror's proportion to the display area.

Implementation Method 1

the grating mirror structure is configured to reflect light away from the display's normal viewing angle

Methodology Applied

Scientific EffectLight reflection: Reflection

Data Source

PatentUS10948750B2Anti-peeping device, anti-peeping display and control method

Publication Date: 2021.03.16 BEIJING BOE DISPLAY TECH CO LTD

AI summary

An anti-peeping device, an anti-peeping display, and a control method. The anti-peeping device comprises an external light source, a grating mirror structure, and a first controller coupled to the grating mirror structure. The external light source is configured to emit light towards the grating mirror structure, and the first controller is configured to control the grating mirror structure to rotate such that light emitted from the external light source towards the grating mirror structure is reflected to a first direction by the grating mirror structure, the first direction deviating from a normal perpendicular to the horizontal plane of the grating mirror structure.