Abstract: A primary optic for a light-emitting diode or device (LED) includes a tilted wedge atop a truncated compound parabolic concentrator (CPC). The CPC includes an input face and a lower exterior surface defined by a tilted parabolic segment rotated about an axis. The bottom end of the lower exterior surface joins the perimeter of the input face. The tilted wedge includes an upper exterior surface above the lower exterior surface, and an interior conical surface surrounded by the lower and the upper exterior surfaces. The upper exterior surface is defined by a tilted straight line rotated about the axis. The interior conical surface is defined by a smooth curve rotated about the axis. The interior conical surface has a vertex located at the axis and within the lower exterior surface. The top ends of the interior conical surface and the upper exterior surface join to define an output aperture.

Abstract: A primary optic for a light-emitting diode or device (LED) includes a tilted wedge atop a truncated compound parabolic concentrator (CPC). The CPC includes an input face and a lower exterior surface defined by a tilted parabolic segment rotated about an axis. The bottom end of the lower exterior surface joins the perimeter of the input face. The tilted wedge includes an upper exterior surface above the lower exterior surface, and an interior conical surface surrounded by the lower and the upper exterior surfaces. The upper exterior surface is defined by a tilted straight line rotated about the axis. The interior conical surface is defined by a smooth curve rotated about the axis. The interior conical surface has a vertex located at the axis and within the lower exterior surface. The top ends of the interior conical surface and the upper exterior surface join to define an output aperture.

Abstract: This invention relates to an electro-optically active display device, comprising at least one individually addressable pixel, each pixel being provided with an obstructing element, such as a reservoir light shield, a black matrix or a mirror element. According to the invention, a portion of at least one component is positioned beneath the obstructing element in such a way that the portion is not visible for a viewer of the display device.

Abstract: The present invention provides a back-lighting device, comprising a housing (10) with a plurality of fluorescent lamps (12), which are operated either individually or in groups (11A, 11B, 11C), wherein operation is controlled by a control device (1) which is fed with response signal; from one or more sensor devices (13A, 13B, 13C). The response signals relate to the intensity of the (groups) of fluorescent lamps. This allows a correction of inhomogeneities in the intensity distribution, based on group or individual variations, and thus a more homogeneous illumination. The invention also provides a display device comprising a back-lighting device according to the invention and a liquid crystal display.

Abstract: A backlight (100) for a display comprises a planar light guide (102) through which light is guided by internal reflection. The light guide is provided with a first plurality of parallel structures (129) essentially along a first direction and a second plurality of parallel structures (122) provided essentially along a second direction, said second direction being substantially perpendicular to said first direction. The first plurality of structures are configured to direct light propagating along said second direction within the light guide, out of a face (110) of the light guide and the second plurality of structures are configured to direct light propagating along said first direction within the light guide, out of a face of the light guide.

Abstract: A mirror device (1) which can be simultaneously used for display purposes based on e.g. an LCD display (5) with a polarizing mirror (2) placed in front of it. The orientation direction of a retardation layer (31, 32) is aligned with respect to the polarization direction of the polarizing mirror to give optimal optical performance.

Abstract: The invention relates to a color display device for display a color image and a method of operating such display. The color display device is provided with a plurality of picture elements, two selectable light sources having different predetermined radiance spectra, color selection means which in combination with the selectable light sources is able to produce respective first and second primary colors on the display panel and control means arranged to select alternately one of the selectable light sources and to provide a portion of the picture elements with image information corresponding to the respective primary colors obtainable with the selected light source. The primary colors of the display device can be selected in a time sequential and space sequential way which enable a reduction of a color break-up.

Abstract: The invention relates to a collimator (1) for use in an optical device, such as a display device, an illumination device or an optical touch sensitive device. The collimator (1) according to the invention comprises a multi-layered sheet of preferably at least five alternating light transmitting (10) and light impervious layers (11). A collimation angle of a few degrees is obtainable using a collimator (1) according to the invention. The invention also relates to methods for producing such a collimator (1) by co-extruding or injection molding.

Abstract: A backlight (5) for a 3D display device, the backlight (5) comprising a planar light guide (7) through which light is guided transversely by internal reflection. The light guide (7) is provided with a plurality of grooves (8), which are configured to direct light propagating within the light guide (7), out of a face (7f) of the light guide (7) so as to form a plurality of line light sources.

Abstract: A mirror device (1) which can be simultaneously used for display purposes, based on e.g. an LCD display (5) with a polarizing min or (2) placed in front of it. the reflectivity of such a mirror display is enhanced by providing at its non-viewing side a further polarizing mirror (11) Color absorption in the display is prevented by placing the color filter (13) or a color (sequential) backlight (30) behind this reflective polarizer at the back of the display.

Abstract: A multi view display (49) is arranged to provide large viewing zones (23,24) while producing little or no cross-talk The display may include a barrier (20) comprising a plurality of colour portions (20a, 20b, 20c) that co-operate with colour filters (19a-19f) in a display panel (14) to selectively direct light to the viewing zones (23, 24) A lenticular screen (30) may be arranged to create or image light lines onto imaging units (32a, 32f) of the display panel (14) that are spaced from one another, so that adjacent units (32a, 32f) are illuminated by light from different lenses (30a, 30b, 30c), directed towards different viewing zones (23, 24) A light source (35) may generate the light at positions aligned with boundaries between adjacent lenses (30a, 30b, 30c) The imaging units may be operated so that units (32a, 32b) displaying information for the first viewing zone (23) are separated from units (32d, 32e) displaying information for the second viewing zone (24) by units (32c, 32f) not used to display inform

Abstract: The present invention relates to an apparatus for detecting an input position on a screen of a display monitor. The apparatus comprises a light guiding layer (301) having an optical structure such that a fraction (304) of the light (303) incident on the layer (301) from the apparatus' exterior is confined in the layer (301). The incident light (303) is emitted by a remote input device, operable by a user, for interacting with the apparatus. The remote input device is, for example, a laser pointer (205). Light detecting means (803) in the apparatus detects the light (304) confined in the layer (301). It is thus possible to determine the input position (206) where the light (207) from the input device enters the layer (301).

Abstract: Devices (1) comprising light detectors (11-14) for detecting light and in response generating detection information, and light-guiding layers (15) comprising outer sides for guiding incident light (21) arriving at the outer sides and originating from input devices (20) towards the light detectors (11-14) are provided with converters (16) for converting the detection information into further information for taking into account one or more angles between the incident light (21) and an axis perpendicular to the light-guiding layer (15). As a result, one/two-dimensional corrections of locations of incidence can be made, and one/two-dimensional estimations of directions of user locations can be made, to adapt device parameters such as rotation, zooming, scrolling, volume, contrast, brightness or sound optimizing parameters, or to select a user from a plurality of users operating their own input devices (20).

Abstract: The present invention relates to a display device having a touch screen (301). The touch screen comprises a first light guide (302), a second light guide (307) and a media (309) between the light guides for eliminating interference and reflections. A light source (308) is arranged to emit light (310) into the first light guide (302), which light is normally confined within the first light guide by means of total internal reflections. The second light guide (307) is arranged at the exterior face of the first light guide (302). When a user of the display device establishes physical contact with the touch screen (301), light is extracted from the first light guide and directed towards light detecting means (303). The light detecting means (303) are arranged for relating a light detecting event to an input position on the touch screen (301), where user interaction occurred.

Abstract: The invention relates to a display device with directional backlight. Stereoscopic images are produced by emitting light in two restricted and limited angular cones. Light is alternatively sent to the left and to the right eye of the observer synchronously with switching between images for the left and the right eye on a fast switching LCD. Alternatively, images may be produced for two or more observers and directed towards a multitude of directions. The display device comprises: a display panel (1), a light redirection element (8) for directing light through the display panel (1), a light guide (6) for directing light towards the light redirection element (8), a first light source (4) coupled to the light guide (6) so as to couple light into the light guide (6) in a first direction, and a second light source (5) coupled to the light guide (6) so as to couple light into the light guide (6) in a second direction.

Abstract: The present invention relates to a display apparatus, which has a diffusely reflecting display panel (21, 41, 51, 61, 71, 81, 91), light guide (23, 43, 53, 63, 73, 83, 93), a light source (22, 42, 52, 62, 72, 82, 92), and a transparent intermediate layer (29, 49, 59, 69), which is arranged between a front surface of said display panel and a rear surface (27, 47, 87, 97) of said light guide. The light source is mounted at an end (24, 84, 94) of the light guide. The display panel is in optical contact with said light guide, and the rear surface of the light guide is provided with a microstructure having wedge-facets (28, 34a-c, 48, 58) which are inclined to the front surface. Thereby a substantially uniform thickness of the light guide as well as a tuneable illumination uniformity are obtainable.

Abstract: This invention relates to a display device (1), comprising a display panel (2) having a layer of electro-optical material (4), a first light-transmissive substrate (5) provided with electrodes (7) in an area of pixels arranged in rows and columns, a second light transmissive substrate (6), said layer of electro-optical material (4) being sandwiched between said first and second layer (5, 6), and an illumination system (3), being arranged on a side of the second substrate (6) being remote from said layer of electro-optical material (4), the illumination system comprising an optical waveguide (14) of an optically transparent material, having an exit face (15) facing said display panel (2). According to the invention, the illumination system (3) further comprises a matrix-addressable light-management member (27).

Abstract: The invention relates to a scanning backlight device, based on dynamic light extraction, the device comprising a light guide structure (24), a light source for emitting light, arranged to be directed into said light guide structure, the light guide structure (24) being provided with an addressable out-coupling member, comprising two or more defined areas, each providing switchable out-coupling of light from said light guide structure (24). The scanning backlight device is characterised in that at least one micro-optical redirection member (23), arranged in proximity with said light guide structure (24), being arranged to redirect light emitted from said light guide structure (23) in an essentially normal direction of said light guide structure.

Abstract: An autostereoscopic display device (1), comprising a display panel (10), a lenticular sheet (15) and an electrically controllable diffuser (80). The electrically controllable diffuser (80) comprises an optical medium (94), e.g. polyethyleneterephthalate (PET), with a structured surface (98) against an electro-optic medium (95), e.g. a small droplet polymer dispersed liquid crystal (PDLC) layer. The electro-optic material (95) refractive index is varied with an applied electric field (or zero field) and is switchable between at least (i) a value (n2) substantially matching that of the optical medium (94), which provides a substantially non-diffusing mode, hence 3D operation of the display device, and (ii) a value (n1) different to that of the optical medium (94) hence causing refraction at the structured surface (98), the structured surface (98) providing different refraction angles (?0) so as to provide an overall diffusing effect, hence 2D operation.

Abstract: The electrophoretic multi-color display device has a plurality of cells (10, 10?, 10?, . . . ) with an electrophoretic medium (14) and pixel electrodes (11, 11, 11?, . . . ) for selecting a subgroup of cells. A color filter array (13) is associated with the pixel electrodes. The color filter array (13) and the pixel electrodes (11, 11?, 11, . . . ) are provided at the same side of the electrophoretic medium (14). Preferably, the cells (10, 10?, 10?, . . . ) of the color filter array (13) are arranged according to a matrix and are disposed along lines registering with the pixel electrodes (11, 11, 11?, . . . ). Preferably, an insulating material (17) with a relatively low refractive index is provided between the pixel electrodes (11, 11, 11? . . . ) and the color filter array (13). Preferably, the insulating material (17) is selected from the group formed by a fluor-polymer, a low-dielectric inorganic film and a low-dielectric nano-porous film.