Covestro Deutschland Ag

Lg Display Co., Ltd.

Bayer Materialscience Ag

Other

Hella Gmbh & Co Kgaa

Günther Walze

Friedrich-Karl Bruder

Rainer Hagen

Thomas Fäcke

Horst Berneth

Thomas Rölle

Marc-Stephan Weiser

Dennis Hönel

Hyungseok Bang

Guensik Lee

Heejin Im

Dennis Honel

Thomas Peter Facke

Wilfried Haese

Martin Mügge

Seungman Ryu

Andrey Nikolaevich Putilin

Werner Hoheisel

Carsten Hohmann

Thomas Roelle

Gunther Stollwerck

Eun Soo Kim

Joobong Hyun

Christian Diedrich

Dongyeon Kim

Yong Seok Hwang

Yongku Lee

Christian Rewitz

Thomas Peter FÄCKE

The invention relates to a method for producing a holographic optical element by providing a recording stack comprising at least one recording element laminated on at least one supporting element, irradiating at least a part of the recording stack with at least one recording beam in an irradiating step, wherein during the irradiating step, the recording stack bends, providing a bending deviation threshold for the recording stack, and adjusting at least one first process parameter such that an expected maximum bending deviation of the recording stack does not exceed the bending deviation threshold, wherein the at least one first process parameter influences the bending behaviour of the recording stack during the irradiating step.

Method for producing a holographic optical element

The invention relates to an apparatus () for producing volume reflection holograms with substrate-guided reconstruction beams, comprising:

Device and method for the industrial production of volume reflection holograms with substrate-guided reconstruction beams

A method for recording a plurality of scatter volume holograms in a photopolymeric recording medium, the method including at least the following steps providing a first laser light source, providing a photopolymeric recording medium including a substrate and a photoactive layer, wherein the photopolymeric recording medium has an index modulation &#x394;n of at least 0.04 and a thickness d of the photoactive layer of at least 25 &#x3bc;m, and irradiating the photopolymeric recording medium with the first laser light beam generated by the first laser light source with a minimum irradiation energy dosage of 3*D, Dbeing the inhibition dosage of the photoactive layer.

Method for producing a beam shaping holographic optical element

An autostereoscopic 3D display device is disclosed. The device includes a first light source and a second light source configured to alternately generate light and a light guide panel arranged to guide the light from the first light source in a first direction as a first light beam and the light from the second light source in a second direction as a second light beam. In the device, a stack of a plurality of holographic optical elements is configured to converge the first light beam and the second light beam from the light guide panel. The stack of the plurality of holographic optical elements may include at least one first holographic optical element and at least one second holographic optical element.

Autostereoscopic 3D display device using holographic optical elements

The invention relates to an indirect lighting arrangement () comprising at least one cylindrical waveguide (). At least one end () of the cylindrical waveguide () is designed to couple light from a first light source () into the cylindrical waveguide (), and the lateral surface () of the cylindrical wave guide () has a coupling section () which is designed to optically couple the cylindrical waveguide () to an arrangeable plate-shaped waveguide (). At least the coupling section () has at least one holographic optical element () which is designed to emit light from the cylindrical waveguide () into the arrangeable plate-shaped waveguide ().

Indirect lighting arrangement, and method for producing an indirect lighting arrangement

The invention relates to an illumination device for illuminating at least one light modulator system of a liquid crystal display, the device comprising at least one waveguide substrate for guiding at least one targeted light beam that can be coupled into the waveguide substrate. The waveguide substrate is at least in optical contact with at least one holographic optical decoupling substrate comprising a plurality of decoupling regions and a decoupling region is at least designed to decouple part of the targeted light beam in the form of a plurality of sub-beams in the direction of the light modulator system. At least one diffuser module is provided, said diffuser module being designed in such a way that at least the outermost sub-beams of two neighboring decoupling regions are at least adjacent to one another before exiting the diffuser module.

Illumination device for a liquid crystal display

The disclosure relates to a viewing angle switchable back light unit wherein a general mode and a privacy mode in a liquid crystal display can be selected. A thin film type back light unit includes a light guide film, a light radiator, a first light source, and a light collimator. The light guide film includes a light entering part at one side, a light guiding part extending from the one side to an opposite side of the one side, and a light radiating part on one plane surface. The light radiator is on the light radiating part. The first light source faces the light entering part. The light collimator is on the light entering part facing the first light source. The light collimator receives an expanding light from the first light source, converts the expanding light into collimated light, and provides the collimated light to the light entering part.

Viewing angle switchable back light unit

The invention relates to a method for producing a holographic optical element by providing a recording stack comprising at least one recording element laminated on at least one supporting element, irradiating at least a part of the recording stack with at least one recording beam in an irradiating step, wherein during the irradiating step, the recording stack bends, providing a bending deviation threshold for the recording stack, and adjusting at least one first process parameter such that an expected maximum bending deviation of the recording stack does not exceed the bending deviation threshold, wherein the at least one first process parameter influences the bending behavior of the recording stack during the irradiating step.

The invention relates to a photopolymer formulation comprising a component reactive toward isocyanates, a polyisocyanate component, a writing monomer and a photoinitiator containing at least one dye and a coinitiator, characterized in that the coinitiator contains at least one substance of the formula (Ia)  The invention further provides a process for preparing the specific coinitiators and the coinitiators obtainable by this process, and additionally a process for producing a holographic medium using the specific coinitiators, and a holographic medium obtainable using the inventive photopolymer formulation. The invention further relates to a laminate structure comprising an inventive holographic medium and likewise specific borates suitable as coinitiators.

Photopolymer formulation for production of holographic media comprising borates with low TG

The invention relates to a photopolymer formulation comprising specific aromatic glycol ethers as writing monomers, matrix polymers and a photoinitiator. The invention further provides an unexposed holographic medium obtainable using an inventive photopolymer formulation, and an exposed holographic medium obtainable by exposing a hologram into an inventive unexposed holographic medium. The invention likewise provides a visual display comprising an inventive exposed holographic medium, for the use of an inventive exposed holographic medium for production of chip cards, identification documents, 3D images, product protection labels, labels, banknotes or holographic optical elements, and specific aromatic glycol ethers.

Aromatic glycol ethers as writing monomers in holographic photopolymer formulations

The present disclosure relates to a thin film type controlled viewing window back light unit and a thin flat type Controlled Viewing window Display using the same. The present disclosure suggests a thin film type back light unit which can include: a base film having a width and a length, and including a high refractive film and a low refractive film stacked on the high refractive film; an incident pattern disposed at one side of a bottom surface of the base film; a reflective pattern disposed at an opposite side apart from the one side with the length of the bottom surface of the base film, and covering the width of the opposite side; a light radiating pattern disposed on an upper surface of the base film; a holographic film for controlling a viewing-window disposed on the light radiating pattern; and a light source being apart from the incident pattern, and providing an incident light to the incident pattern.

Thin film type controlled viewing window back light unit and thin flat type controlled viewing window display using the same

The present invention provides a novel photopolymer formulation comprising matrix polymers, writing monomer and a photoinitiator and further comprising a compound of formula (1) where A, Aand Aare each independently hydrogen, fluorine, chlorine, bromine or iodine, R, R, R, Rand Rare each independently hydrogen, halogen, cyano, nitro, amino, alkylimino, azide, isonitrile, enamino, formyl, acyl, carboxyl, carboxylate, carboxamide, orthoester, sulphonate, phosphate, organosulphonyl, organosulphoxidyl, optionally fluorinated alkoxy or an optionally substituted aromatic, heteroaromatic, aliphatic, araliphatic, olefinic or acetylenic radical while suitable radicals may be connected together via bridge of any desired substitution, or in that two or more compounds of formula (I) may be connected together via at least one of the radicals R, R, R, Rand R, in which case these radicals therein constitute a 2- to 4-tuply functional bridge, with the proviso that at least one of the radicals R, R, R, Rand Ris not hydrogen. Further subjects of the invention are a photopolymer comprising matrix polymers, a writing monomer and photoinitiator, a holographic medium comprising a photopolymer formulation of the present invention or being obtainable by use thereof, the use of a holographic medium of the present invention and also a process for producing a holographic medium by using a photopolymer formulation of the present invention.

Holographic media with improved light sensitivity

The present disclosure relates to a method for producing a beam shaping holographic optical element, which is configured to generate diffracted beams configured to reconstruct an image of a diffusor irrespectively of the point of impact of a pencil of light on the beam shaping holographic optical element, comprising providing a recording element, providing a master element comprising a particular pattern, forming a recording stack comprising the recording element and the master element such that the master element is arranged to the recording element in a closed-copy distance, irradiating at least a part of the recording stack with a reconstruction beam, irradiating at least a part of the recording stack with a reference beam, wherein at least one of the reconstruction beam or reference beam penetrates the master element to record the pattern of the master element onto the recording element.

Disclosed is a flat panel display device having a display panel and a back light unit in which the back light unit may, for example, include a base film having a width and a length and including a high refractive film and a low refractive film on the high refractive film; a first incident pattern at a one side of a first surface of the base film; a reflective pattern on the first surface of the base film at an opposite side spaced apart from the one side with a distance substantially corresponding to the length of the first surface of the base film and substantially covering the width of the first surface of the base film; a light radiating pattern on a second surface of the base film; and a light source spaced apart from the first incident pattern with a first focal length and providing an incident light to the first incident pattern.

Thin film type back light unit for flat panel display

The present invention relates to a multilayer, surface structured solid plate for light guidance, the base material of which consists of a transparent plastic material, and optionally one or more cover layers.

Growing community of inventors

Leverkusen, Germany

Günther Walze