Abstract: A mirror device which can be simultaneously used for display purposes, based on e.g. an LCD display with a polarizing mirror 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 Color absorption in the display is prevented by placing the color filter or a color (sequential) backlight behind this reflective polarizer at the back of the display.

Abstract: An adaptively controllable backlight system (1), having a plurality of individually controllable light-sources (3a-d) arranged on a backlight panel (2) to emit light in a direction substantially normal to the backlight panel (2). The backlight system (1) further comprises an outcoupling plate (5) arranged adjacent to the backlight panel (2), and adapted to capture a fraction of the light emitted by the light-sources (3a-d) and to outcouple the fraction of light through at least one outcoupling-surface (8a-b) of the outcoupling plate (5), and at least one light-guide (9, 10) arranged to receive the outcoupled light and adapted to guide the outcoupled light towards at least one outcoupling-surface (14a-b, 15a-b) of the light-guide (9, 10). Additionally, at least one sensor (16-19) is arranged to receive the guided outcoupled light and adapted to provide a signal indicative of at least one property of the outcoupled light, thereby enabling adaptive control of the backlight system (1).

Abstract: A high efficiency lighting system (100) is described that has a small etendue. This can be used, for example, for backlighting a display device such as a liquid crystal display (LCD), projection displays, as well as for general lighting purposes. A portion of the light from a light emitting device die (101) falls onto a fluorescent material (105,106), such as phosphor. Dichroic mirrors (107,109) prevent the light generated by the fluorescent material to return to the light-emitting device. The mirrors may also provide collimation of the generated light and the remainder of the light from the light-emitting device. In this way a high efficiency system is realized because little or no generated light is absorbed and the generated light does not have to travel through a fluorescent material layer and thus has a high chance to go in the desired direction.

Abstract: The invention relates to an illumination device (10) for illuminating a surface, with a lighting element (20) and an illuminating body (30), wherein the lighting element (20) emits an artificial light (21,21?), a housing element (40) comprises the lighting element (20) and supports the illuminating body (30), the illuminating body (30) comprises a transparent light conductive material and is generally overlying the surface, being illuminated. The invention discloses, that the illuminating body (30) comprises a light extraction layer (50), configured to receive and to deflect the artificial light (21,21?) from the lighting element (20) onto the surface.

Abstract: A lighting device is provided for projecting a pixelated lighting pattern to be viewed onto a surface facing said device is provided. The device comprises a plurality of independently controllable lighting units (1), each lighting unit comprising at least one light-emitting diode (3, 4, 5, 6), and a controller (7) for controlling the emission of light from said lighting units. A device according to the present invention allows ambient illumination of a surface and projection of images and patterns.

Abstract: A lighting structure comprises a light generation assembly comprising a light source for generating light. In order to meet desired lighting requirements, the lighting structure further comprises a substantially plate-shaped light guiding structure. The light guiding structure is provided with a light assembly recess and a light emission structure. The light generation assembly is arranged in the light assembly recess of the light guiding structure such that light emitted by the light generation assembly enters and propagates in the light guiding structure. The light emission structure is arranged for emitting the propagating light from the light guiding structure.

Abstract: A lamp for emitting light, comprising a transparent sheet-like lightguide, with at least one light receiving side, a light emission front surface and a back surface opposite the front surface. The lamp further comprises a plurality of light sources, positioned in an array and optically coupled to at least one light receiving side. The back surface of said lamp comprises a plurality of optical extraction structures, for example provided in parallel curved lines. Furthermore, the lamp is substantially free from light scattering structures in a light path of the light to be emitted.

Abstract: The invention relates to a light emitting device comprising a light emitting element (100) and a light guide (101) arranged on a textile substrate (102). The light guide has a back surface (103) facing the textile substrate, a front surface (104) facing away from the substrate, and a light receiving surface (105). The light emitting element (100) is arranged such that at least part of the light emitted by the light emitting element (100) is coupled into the light guide (101) through the light receiving surface (105), and is subject to total internal reflection in the light guide (101). Furthermore, the light guide (101) is arranged such that at least part of the light coupled into the light guide (101) exits the light guide (101) through the front surface (104) and/or the back surface (103).

Abstract: The invention relates to an illumination system (10) for illuminating a display device, and to the display device. The illumination system comprises a light distribution element (20 for distributing light across the display device. The light distribution element comprises a light output window (40), a rear wall (42) situated opposite the light output window, and edge walls (44, 46) extending between the light output window and the rear wall, at least one of the edge walls comprising a light input window (48) for admitting light into the light distribution element. The light distribution element further comprises specularly reflective light-outcoupling means (50) for specularly reflecting light from the light distribution element towards the display device via the light output window. A first light beam (100) comprises light of a first primary color (R) impinging on the light input window for coupling the light of the first primary color into the light distribution element.

Abstract: An active matrix display device comprises an array of display pixels, each pixel comprising: a current-driven light emitting display element (2); a drive transistor (22) for driving a current through the display element; a storage capacitor (24) for storing a voltage to be used for addressing the drive transistor; and an addressing transistor (16) for coupling data from a data line (6) to the pixel during pixel addressing. The addressing transistor (16) comprises a phototransistor, and the data line (6) is used for external monitoring of the phototransistor. This device design uses a pixel-addressing transistor (16) as the optical feedback element. This addressing transistor is a fundamental requirement of an active matrix-addressing scheme, and its use as a feedback element can therefore avoid any addition pixel complexity to implement an optical feedback function.

Abstract: An optical element (50; 72a-d; 80; 90), which has a first optical member (1; 51; 86; 93; 101) with at least one indentation (2a-f; 20; 25; 30; 35; 40; 57a-c; 100) at a first surface (3) thereof, and a second optical member (5; 52; 87a-c; 94; 104) attached to the first surface (3) of the first optical member (1; 51; 86; 93; 101), this second optical member (5; 52; 87a-c; 94; 104) essentially conforming to the at least one indentation (2a-f; 20; 25; 30; 35; 40; 57a-c; 100) in the first optical member. The optical element further comprises at least one reflector (9-10; 55a-c; 85a-c; 92a-e) at an interface between the first and second optical members, the at least one reflector being located at the at least one indentation. The reflector (9-10; 55a-c; 85a-c; 92a-e) is formed by an interface between a cavity (8) formed between the first and second optical members and one of the first and second optical members.

Abstract: A light guide (11; 101; 111) comprising first and second oppositely arranged faces, an in-coupling portion (13a-f) for in-coupling of light from a light-source (12a-f; 95a-f; 102; 106a-c; 112a-f), and an out-coupling portion (15a-f; 103; 113a-f) located adjacent to the in-coupling portion (13a-f). The out-coupling portion (15a-f; 103; 113a-f) is configured to out-couple a primary light beam having a direction of propagation directed from a position in the in-coupling portion (13a-f) with a lower out-coupling efficiency than a secondary light beam having a direction of propagation directed from a position in the light guide (11; 101; 111) outside the in-coupling portion (13a-f). In this manner, a good mixing of light in the light guide can be achieved without imposing any particular requirements on the collimation of the in-coupled light.

Abstract: An electro-optically active display device including 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. A portion of at least one electrical 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: A light collimation device comprising a wave guide plate (100) having a first surface (101), an opposing faceted second surface (102) comprising a plurality of essentially planar parallel portions (103) and a plurality of facets (104) connecting said planar parallel portions (103) and at least one surface (105) for receiving light is provided. Each facet (104) is formed at a non-right angle (?) to said planar parallel portions (103) and the device further comprises a plurality of collimating refractive elements (106), wherein each collimating refractive element (106) corresponds to a separate one of the plurality of facets (104), and is located in the beam path of at least the major part of light being reflected on the corresponding facet (104) and extracted from said wave guide plate (100).

Abstract: A display device with directional backlight produces stereoscopic images by emitting light in two 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 different directions. The display device includes a display panel, a light redirection element for directing light through the display panel, and a light guide for directing light towards the light redirection element. Two light sources are coupled to the light guide so as to couple light into the light guide in two directions. The light redirection element has a first groove structure and the light guide has a second groove structure so that light from the light sources are directed through the display panel with two angular distributions.

Abstract: The invention relates to an electro-optically active display device, comprising at least one individually addressable pixel, each pixel being provided with an obstructing element (3), 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: A light collimation device comprising a wave guide plate (100) having a first surface (101), an opposing faceted second surface (102) comprising a plurality of essentially planar parallel portions (103) and a plurality of facets (104) connecting said planar parallel portions (103) and at least one surface (105) for receiving light is provided. Each facet (104) is formed at a non-right angle (?) to said planar parallel portions (103) and the device further comprises a plurality of collimating refractive elements (106), wherein each collimating refractive element (106) corresponds to a separate one of the plurality of facets (104), and is located in the beam path of at least the major part of light being reflected on the corresponding facet (104) and extracted from said wave guide plate (100).

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 an illumination system for illuminating display devices, comprising at least one light source, and a light guide for guiding light generated by the at least one light source in the direction of a display device. The invention also relates to a display device provided with such an illumination system.

Abstract: A lighting device is provided for projecting a pixelated lighting pattern to be viewed onto a surface facing said device is provided. The device comprises a plurality of independently controllable lighting units (1), each lighting unit comprising at least one light-emitting diode (3, 4, 5, 6), and a controller (7) for controlling the emission of light from said lighting units. A device according to the present invention allows ambient illumination of a surface and projection of images and patterns.