Peep-proof Display Apparatus with Dual Electric Field Control

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Solution Overview

Problem

Conventional multi-angle display structures, such as FFS and IPS, fail to provide effective privacy protection as they allow information to be glimpsed from outside the intended viewing angle, and existing peep-proof designs compromise brightness and contrast performance.

Innovation Solution

A peep-proof display apparatus with sub-pixels comprising a first conductive layer, isolation film, light modulator layer with liquid crystals, second conductive layer, insulation film, and third conductive layer, where the light modulator layer is applied with electric fields parallel and perpendicular to achieve wide and narrow viewing angles without additional sub-pixels for light leakage adjustment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional multi-angle display structures (FFS, IPS) are used to achieve wide viewing angles, then viewing angle flexibility is improved, but privacy protection capability deteriorates

Engineering Contradiction:

Improveviewing angle flexibilityVSAvoidprivacy protection capability

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent implements dynamic control of liquid crystal orientation through dual electric field application (parallel and perpendicular fields). By adjusting the strength and direction of electric fields applied to the light modulator layer, the display can dynamically switch between wide viewing angle mode and narrow viewing angle mode, adapting to different privacy requirements in real-time.

Inventive Principle:

Principle #15Dynamics

2Object-affected harmful factors

If additional sub-pixels with side-light leakage characteristics are added to achieve peep-proof function, then privacy protection capability is improved, but display transmittance and contrast performance deteriorate

Engineering Contradiction:

Improveprivacy protection capabilityVSAvoiddisplay transmittance and contrast performance

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The patent changes the physical parameters of the liquid crystal layer by applying different electric field configurations. By controlling the orientation angle of liquid crystal molecules through electric field adjustment, the display achieves peep-proof effect without adding sub-pixels, thereby maintaining high transmittance and contrast performance of the original display structure.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces a new control dimension by applying electric fields in two directions (parallel and perpendicular to the light modulator layer). This dual-directional electric field control enables precise adjustment of liquid crystal orientation, achieving privacy protection through dimensional control rather than through additional structural elements like extra sub-pixels.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Adaptability or versatility

If liquid crystal rotation is controlled via switching electric field between two electrodes to achieve multi-angle display, then viewing angle adaptability is improved, but privacy protection capability deteriorates

Engineering Contradiction:

Improveviewing angle adaptabilityVSAvoidprivacy protection capability

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

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 maintains proper display quality while providing effective privacy protection by adjusting viewing angles without compromising brightness or contrast, ensuring that information is not visible outside the intended viewing range.

Implementation Method 1

The light modulator layer includes a plurality of liquid crystal

Methodology Applied

Scientific EffectLiquid crystal: Liquid Crystals

Implementation Method 2

the light modulator layer is applied with an electric field parallel thereto

Methodology Applied

Scientific EffectElectric field: Electric Field

Data Source

PatentUS8988643B2Peep-proof display apparatus and driving method thereof

Publication Date: 2015.03.24 AU OPTRONICS CORP

AI summary

A peep-proof display apparatus includes a plurality of sub-pixels disposed between a first substrate and a second substrate. Each sub-pixel includes a first conductive layer, a color filter layer, an isolation film, a light modulator layer, a second conductive layer, an insulation film and a third conductive layer. The color filter layer is disposed between the first conductive layer and the isolation film. The light modulator layer is disposed between the isolation film and the second conductive layer. The insulation film is disposed between the second and third conductive layers. In a first display mode, the light modulator layer is applied with an electric field parallel thereto. In a second display mode, the light modulator layer is applied with an electric field parallel thereto and an electric field perpendicular thereto.