Raychem Limited

Philip J Jones

Hundi Panduranga Kamath

Akira Tomita

A Brian Macknick

Mark F Wartenberg

Larry J White

Robert H Reamey

Paul Becker

Mark S Thompson

Lawrence J White

John R Havens

Wayne Montoya

Stephen S Moore

Frank Wasilewski

Brackin L Andrews

Justin N Chiang

Damoder Reddy

Binh Vu Cao

An image projection arrangement is provided. The arrangement includes a light source assembly for producing a first light beam. A reflective image display system is arranged in the path of the first light beam and has at least one cell for generating an image to be projected. A projection lens system is arranged in the path of a second light beam originating from the image display system for projecting the image produced by the image display system onto a projection screen. Between the light source assembly and the image display system on the one hand, and between this system and the projection lens system on the other hand, a transition from a first to a second medium is provided. This transition occurs at an interface having a normal direction. The first and second media have different refractive indices. The transition is arranged such that one of the first and second light beams is totally reflected by the transition while the other light beam is transmitted by the transition. Between the light source assembly and the image display system on the one hand, and between this system and the projection lens system on the other hand, an angle is formed, the bisector of this angle defining an optic axis of the system. The bisector of the angle is not parallel to the interface normal.

Angled color dispersement and recombination prism

An encapsulated liquid crystal layer is patterned by placing a mask into contact with a coated substrate. The mask is held against the substrate, for example, by a vacuum, to form a seal. The assembly is submerged in a solvent to dissolve the exposed region of the encapsulated liquid crystal material.

Method and apparatus for patterning encapsulated liquid crystal layers

An improved electrode for use in displays, including those of the touchscreen type, has a conductive polymeric material disposed over the electrode material at those regions where the electrode is subject to flexing in use, thereby putting the electrode material at risk of cracking. The conductive polymeric material bridges any cracks which may develop, thus providing electrical continuity.

Flexible electrode-bearing article

A chiral nematic liquid crystal-polymer composite capable of having a paper-white off-state and a highly transparent on-state. The composite includes droplets of at least two different liquid crystal materials. The different liquid crystal materials are isolated from each other and have different reflection bands. The composite is suitable for use in light valves generally and direct view and projection displays particularly.

Liquid crystal composite with droplets of plural chiral nematic

A color projection display uses a dichroic cube for modulating the color of light reaching the imaging element of the display. This way, a colored image may be projected by frame sequential technique, but with the use of only a single imaging element.

Apparatus for projecting colored images

A liquid crystal projection display, having (a) a light source for producing light of at least two different primary colors; (b) an imaging element corresponding to each primary color light produced by the light source, each imaging element comprising plural pixel elements, each pixel element comprising liquid crystal composition dispersed in plural volumes in a containment medium and being independently addressable to primarily scatter light incident thereon in the absence of a sufficient electric field and to primarily transmit light incident thereon in the presence of a sufficient electric field; and (c) a lens for projecting light transmitted by each imaging element onto a screen; the liquid crystal composition in the pixel elements of the imaging element corresponding to the primary color light of longest wavelength including a pleochroic dye of a color complementary to the primary color light of longest wavelength, which pleochroic dye preferentially absorbs incident light which has not been scattered by the liquid crystal material in the absence of the sufficient electric field and transmits incident light in the presence of the sufficient electric field.

Liquid crystal projection display with complementary color dye added to

An active matrix liquid crystal display having improved performance properties is made using an encapsulated liquid crystal structure comprising a containment medium having dispersed therein a liquid crystal composition having an average dielectric constant greater than about 6 and other specified characteristics.

Active matrix liquid crystal display with average dielectric constant

A reflective liquid crystal display includes a retroreflector made of an array of full corner cube elements which have their optic axes tilted away from the normal to the plane of the display by an angle of between about 10.degree. and about 45.degree..

Liquid crystal display having improved retroreflector

A display presenting an image having enhanced contrast has a screen which switches between a bright, image-presenting state and a dark, image-less state, to minimize glare from ambient light reflections. Alternatively, a shutter which switches between a substantially transparent state and a dark, light absorbing state is placed over a conventional screen.

Displays having improved contrast

A display having (a) a first electrode; (b) a second electrode; (c) a display medium positioned between the first and second electrodes, which display medium is switchable between a first state in which incident light is at least one of scattered and absorbed and a second state in which the amount of such scattering and/or absorption is reduced; and (d) scattering centers disposed in front of the second electrode for scattering incident light with a scattering half angle of between about 2 and about 40 degrees when the display medium is in its second state, while permitting at least 10% of the incident light to be transmitted.

Display having light scattering centers

A display having a first electrode means; a second electrode means; and a display medium positioned between the first and second electrode means, which display medium contains a pleochroic dye, is switchable between a first state in which incident light is substantially absorbed by the pleochroic dye and a second state in which the amount of such absorption is substantially reduced, and is capable of scattering incident light with a scattering half angle between about 5 and about 40 degrees when the display medium is in its second state, while permitting at least 10% of the incident light to be transmitted. The absolute difference between the ordinary index of refraction of the liquid crystal and the refractive index of the containment medium is 0.10 to 0.20.

Display having light scattering electro-optical element

A multipurpose liquid crystal display, suitable for use as a reflective display and as overhead projection panel, includes (a) a first transparent electrode means; (b) a second transparent electrode means; (c) a display medium positioned between the first and second transparent electrode means, which display medium is switchable between a first state in which incident light is scattered and a second state in which the amount of such scattering is reduced; (d) a retroreflector removably positioned behind the second transparent electrode means; and (e) means for removably positioning the retroreflector behind the second transparent electrode. Preferably, the display medium comprises positive dielectric anisotropy, operationally nematic liquid crystals dispersed in a containment medium.

Multipurpose liquid crystal display having means for removably

A liquid crystal display comprises (a) a first transparent base; (b) a plurality of first picture electrodes on the first transparent base; (c) a plurality of data lines for supplying electrical signals to the first picture electrodes; (d) a second transparent base, parallel to and spaced apart from the first transparent base; (e) a plurality of second picture electrodes on the second transparent base; (f) a plurality of varistor elements made of a varistor material comprising zinc oxide as a primary metal oxide and cobalt and praseodymium oxides as additive metal oxides, in amounts of between 0.1 and 8.0 atom % cobalt and between 0.08 and 8.0 atom % praseodymium, one varistor element being associated with and in electrical contact each second picture electrode; (g) a plurality of scan lines for supplying electrical signals to the second picture electrodes via the respective associated varistor elements; and (h) electrooptically active liquid crystal material between the first and second picture electrodes. In a preferred embodiment, the plurality of varistor elements is in the form of a varistor array comprising an integral body of varistor material having two major opposing faces, one of the opposing faces having an array of indentations thereon, each indentation defining a varistor element.

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Menlo Park, CA, United States of America

Philip J Jones