Reveo, Inc.

Other

Opthentic Corp.

Chelix Technologies, Inc.

Yingqiu Jiang

Sadeg Mustafa Faris

Le Li

Aharon Hochbaum

Bunsen Fan

Sameer Vartak

Richard C Wiley

Jian-Feng Li

Hristina Galabova

Jian-feng Li

Marvin Ancheta

Wan Kwau Cheou

Swee Yong Pung

Disclosed herein is a transmissive or reflective optical security device, containing a hidden image, that is based on patterned retardation in a single layer of a nematic liquid crystal polymer on a substrate and methods of fabricating said hidden image by selectively modifying the retardation value. Fabrication methods that are compatible with high throughput standard roll-to-roll or printing lines are disclosed. Said image becomes visible under polarized illumination. The hidden image feature enhances the counterfeiting resistance of the security device.

Optical security device having hidden images and methods of making the same

The current invention relates to methods for generating images with multiple reflection colors in a single layer of cholesteric liquid crystal polymer (CLCP) for optical security applications such as optical devices and labels for brand protection or document security. The multicolor feature enhances the counterfeiting resistance of a CLCP based optical devices, in addition to its intrinsic polarized selective reflection and being an optical variable device. The fabrication methods include: digital printing on CLCP, the use of heat transfer masks and UV masks as well as hot stamping techniques. Embodiments are presented that adapt the above methods to continuous, roll-to-roll printing lines.

Methods of producing multicolor images in a single layer of cholesteric liquid crystal polymer

The present invention relates generally to an optical security device and an optical security system in which hidden images that are invisible to the naked eye under unpolarized illumination, become visible under either linearly or circularly polarized illumination. Preferred fabrication methods of said optical security device are disclosed.

Optical security device and system and fabrication methods thereof

A polarization-sensitive beaded retro-reflective sheeting having cholesteric liquid crystal material as the specular reflective coating and methods of making the same are described.

Polarizing retro-reflective sheeting comprising a cholesteric liquid crystal polymer film

Herein provided is a liquid crystal cell manufacturing process and assembly system. Mechanical steps are performed under substantially atmospheric conditions (as opposed to in a vacuum environment) thereby simplifying liquid crystal cell assembly. Under such conditions, it is economically feasible to produce large panel, bubble-free liquid crystal cells.

Liquid crystal cell assembly method and system

An image display system includes a polarized image projection device, a polarization preserving transmissive diffusiver, and a polarizing reflector element as a non-blocking mirror (referred to as a 'combiner'). The combination of a polarization preserving transmissive diffuser or rear projection screen and a polarizing reflector results in a high brightness HUD for applications including automotive, aerospace, or other applications where HUD systems are used. The system also maintains the low haze and high transmittance of the windshield that will meet the requirement of standards of windshields for motor vehicles and similar applications.

Real image configuration for a high efficiency heads-up display (HUD) using a polarizing mirror and a polarization preserving screen

Disclosed are super broadband circularly polarizing film materials and novels methods of fabricating and using the same. The circularly polarizing materials are made from a film of material, such as a CLC polymer having a cholesteric order, in which a liquid crystal material, such as a nematic liquid crystal material, is distributed in a non-linear fashion across the thickness of the film in a plurality of liquid crystal-rich and liquid crystal-depleted sites in the CLC polymer. The pitch of the helices of the CLC molecules in the polyermized CLC material varies in a non-linear (e.g. exponential) manner along the depth dimension (i.e. transverse to the surface) thereof. The resulting circularly polarizing materials have reflection and transmission characteristics over bands of operation approaching 2000 nm. Depending on the final spiral structure of the materials utilized, the CLC circularly polarizing materials reflect either left-handed or right-handed circularly polarized light.

Super broad-band polarizing reflective material

A light controlling film is disclosed, comprising a polymerized polymer network varying spatially in a direction normal to the film surface, where the polymerized polymer network is a crosslinked high molecular weight polymeric material mixed with a low molecular weight nematic material exhibiting cholesteric liquid crystal (CLC) order, wherein an electric field impressed in the film controls the reflection bandwidth of circularly polarized light.

Spectrum-controllable reflective polarizers having electrically-switchable modes of operation

A method of producing an iridescent reflecting surface on an object is presented. Flakes of dry non metallic reflecting material such as cholesteric liquid crystal (CLC) material are applied to the surface so that the flakes are parallel with the surface and bound with a binder to the surface.

Method of producing iridescent coatings

A reflective liquid crystal display (LCD) including a cholesteric liquid crystal polarizing device and a liquid crystal cell superimposed with one another. In various embodiments, the reflective LCD may be a normally white mode or normally black mode device. In another variation, the liquid crystal cell may include a 90&deg; twisted nematic liquid crystal.

Reflective liquid crystal display using cholesteric polymers

A color liquid crystal display using reflective color filters using layers of cholesteric liquid crystals is disclosed. The reflective color filters have two different center wavelengths and bandwidths per layer and are stacked in two layers to provide colored light for displays. With various numbers of layers in the stack, different polarization levels are provided. The pixels in the display of the invention are arranged such that multiple adjacent sub-pixels in a layer with the same color makes the color filters easier to manufacture.

High-brightness color liquid crystal display panel employing light recycling therewithin

Broad-band polarizer and method of fabricating broad-band polarizers

Reflective color filters using layers of cholesteric liquid crystals with two different center wavelengths and bandwidths per layer are stacked in two layers to provide colored light for displays. With a two layer stack circularly polarized light of one handedness can be provided. With a two layer stack circulary unpolarized colored light can be provided. With a broadband polarizing filter overlapping other filters in the stack a black matrix can be provided by reflecting all colors and transmitting no light in the overlapping areas. When broadband reflective cholesteric liquid crystals are used two primary colors can be reflected in the same pixel of a display making reflective layers with two reflective portions per layer possible. Color displays having three linear sub-pixels with three primary colors or with four sub-pixels of white, blue, green, and red in a pixel with two colors in a top row and two colors on a bottom row can are made with two colors per layer in two layer stacks. The pixels in the display are arranged such that multiple adjacent sub-pixels in a layer, or row in a layer, with the same color makes the color filters easier to manufacture. Displays using these reflective color filters may have a reflective polarizer for viewing the display at wide angles without color distortion.

High-brightness color liquid crystal display panel employing light recycling therein

Disclosed are super broadband circularly polarizing film materials and novels methods of fabricating and using the same. The circularly polarizing materials are made from polymerizable CLC film material having a cholesteric order, in which a liquid crystal material, such as a nematic liquid crystal material, is distributed in a non-linear fashion across the thickness of the film in a plurality of liquid crystal-rich and liquid crystal-depleted sites in the CLC polymer. The pitch of the helices of the CLC molecules in the polyermized CLC material varies in a non-linear (e.g. exponential) manner along the depth dimension (i.e. transverse to the surface) thereof. The resulting circularly polarizing materials have reflection and transmission characteristics over bands of operation approaching 2000 nm. Depending on the final spiral structure of the polymeriable CLC materials utilized, the CLC circularly polarizing materials reflect either left-handed or right-handed circularly polarized light. The CLC circularly polarizing materials of the present invention can be used in a variety of applications.

Circularly polarizing reflective material having super broad-band reflection and transmission characteristics and method of fabricating and using same in diverse applications

Growing community of inventors

Sunnyvale, CA, United States of America

Yingqiu Jiang