Electrophoretic Optical Element for Privacy Screens
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Solution Overview
Problem
Existing display technologies face challenges in providing a wide viewing angle for sharing information while maintaining privacy, as they often result in light loss, complex designs, and reduced brightness when switching between viewing modes.
Innovation Solution
An optical element with a planar substrate and a liquid or skeleton matrix containing electrophoretically or magnetophoretically movable particles that absorb, reflect, or scatter light, allowing for angle-dependent transmission control through electromagnetic switching means, enabling switching between privacy and free viewing modes without substantial resolution reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If accessory foils based on micro-louvers are used for visual data protection, then privacy protection is improved, but light transmission is reduced and the structure becomes more complex
Solution Approach 1:
The patent replaces mechanical micro-louver structures with electrophoretic or magnetophoretic particle systems that use electric or magnetic fields to control light transmission. This substitution eliminates the need for complex mechanical switching mechanisms while maintaining privacy protection functionality and improving light transmission efficiency.
Solution Approach 2:
The patent changes the physical state and distribution of particles within the optical element by applying electric or magnetic fields. By controlling the position and orientation of particles through field parameter adjustments, the system dynamically switches between transparent and privacy-protected states without mechanical movement, thereby preserving light transmission while achieving privacy protection.
2Object-affected harmful factors
If micro-louver foils are applied manually for privacy mode, then privacy protection is improved, but ease of operation deteriorates and light transmission is reduced
Solution Approach 1:
The patent replaces manual mechanical application and removal of micro-louver foils with an electrically or magnetically controlled particle system. Users can switch between privacy and viewing modes by simply activating or deactivating the field, eliminating the need for manual handling and improving operational convenience.
Solution Approach 2:
The optical element performs the privacy protection function automatically through field-controlled particle movement. The system self-regulates its light transmission properties based on applied fields, eliminating the need for external manual intervention to attach or remove protective layers.
3Shape
If complex optical elements such as microlens elements and prism structures are used in backlight, then light distribution control is improved, but device complexity increases and light transmission is reduced
Solution Approach 1:
The patent replaces complex fixed optical elements like microlens arrays and prism structures with a dynamic field-controlled particle system. This substitution simplifies the overall device structure by eliminating multiple separate optical components while maintaining the ability to control light distribution through particle positioning and orientation.
Solution Approach 2:
The field-controlled particle system serves multiple functions simultaneously: it controls light distribution, switches between privacy and viewing modes, and maintains brightness. This multi-functionality replaces what would otherwise require separate optical elements, thereby reducing device complexity while achieving the same light control objectives.
4Shape
If special optical surfaces resembling Fresnel lenses are used to deflect light, then light deflection control is improved, but manufacturing complexity increases and light transmission is reduced
Solution Approach 1:
The patent replaces complex Fresnel lens-like optical surfaces with a field-controlled particle system that achieves light deflection through particle positioning rather than fixed geometric structures. This substitution greatly simplifies manufacturing, as it eliminates the need for precision-molded complex surface geometries while maintaining light control functionality.
Solution Approach 2:
Instead of fixed geometric light-deflecting surfaces, the patent uses dynamically controllable particles that can be positioned and oriented through applied fields. This dynamic approach allows for flexible light deflection control without requiring complex static structures, thereby simplifying manufacturing while maintaining functionality.
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 manages light transmission based on the viewer's angle, allowing for seamless switching between viewing modes while maintaining brightness and resolution, addressing the limitations of existing technologies.
Implementation Method 1
a liquid or a skeleton matrix that is arranged between the first and the second large surface and contains electrophoretically or magnetophoretically movable particles interacting with light of one or several wavelengths or wavelength ranges preferably visible by a human eye. The interaction with light takes place by absorption, reflection and/or scattering
Implementation Method 2
a liquid or a skeleton matrix that is arranged between the first and the second large surface and contains electrophoretically or magnetophoretically movable particles interacting with light of one or several wavelengths or wavelength ranges preferably visible by a human eye. The interaction with light takes place by absorption, reflection and/or scattering
Implementation Method 3
a liquid or a skeleton matrix that is arranged between the first and the second large surface and contains electrophoretically or magnetophoretically movable particles interacting with light of one or several wavelengths or wavelength ranges preferably visible by a human eye. The interaction with light takes place by absorption, reflection and/or scattering
Implementation Method 4
electrophoretically or magnetophoretically movable particles... electromagnetic switching means which are configured in planar fashion on one or both large surfaces and/or in the substrate between the large surfaces, and which, in a switched-on state, generate an electromagnetic field, whereby the particles are moved
Implementation Method 5
electrophoretically or magnetophoretically movable particles... electromagnetic switching means which are configured in planar fashion on one or both large surfaces and/or in the substrate between the large surfaces, and which, in a switched-on state, generate an electromagnetic field, whereby the particles are moved
Data Source
AI summary
An optical element comprising a planar substrate with a first large surface functioning as a light-entrance surface, and a second large surface functioning as a light-exit surface. The optical element further comprises a liquid or skeleton matrix arranged between the first and second large surface, and electrophoretically or magnetophoretically movable particles that interact with light of one or several wavelengths or wavelength ranges. The optical element also comprises an electromagnetic switching structure configured in a planar shape in the substrate on one or both large surfaces and/or between the large surfaces, these electromagnetic switching structures generating, in a switched-on state, an electromagnetic field, whereby the particles are moved in the liquid or the skeleton matrix, thus causing, due to the interaction with the particles, a change of an angle-dependent transmission, by the optical element, of light of the wavelengths or wavelength ranges that enters the substrate through the light-entrance surface.