Abstract: A light-emitting device (100) is provided, comprising four light sources (101, 102, 103, 104) and a collimating element (105) for collimating and mixing the light from the light sources. The light-collimating element comprises three V-shaped profile surfaces (110, 120, 130) arranged with their edges (115, 125, 135) towards the light sources. The V-shaped profile surfaces are provided with dichroic filters that transmits light from the light sources that they are arranged in front of, and reflects light from the remaining light sources. Such a device is capable of collimating and mixing the light from the four light sources, such that essentially the same degree of collimation is achieved for all four light sources.

Abstract: A light-emitting device, comprising at least a first light source (101) and a second light source (102) is provided. The light source further comprises a first collimating means (111) for collimating light from the first light-source and a second collimating means (112) for collimating light from said second light source wherein the output areas of the collimating means at least partly overlaps. A light guiding means (107) is arranged between said light sources and said collimating means for guiding light from the first light source to the first light collimating means, and from the second light source to the second collimating means. A light-emitting device of the present invention can provide well mixed and collimated light even though there is a distance between the light sources and the collimating means.

Abstract: A waveguide (1), arranged to guide light from at least one light source (3), comprising an outcoupling structure (4) adapted to enable outcoupling of said light from said waveguide in a general outcoupling direction, and at least one guiding edge (5) adapted to contain said light in said waveguide by reflecting said light on its way towards said outcoupling structure, wherein the outcoupling structure comprises an asymmetrically diffusing layer (6; 7). Such asymmetric diffusion improves the color mixing, and removes or limits the occurrence of color bands or intensity bands, while limiting the divergence in the direction where no color mixing or intensity variation problems exist.

Abstract: A liquid crystal display comprising first and second liquid crystal display panel (1, 3), each defining an array of picture elements (13, 15). The resolution of the image displayed on the second liquid crystal display panel (3) is lower than that of the image displayed on the first liquid crystal display panel (1). The picture elements (15) of the second liquid crystal display panel (3), located between the first liquid crystal display panel (1) and backlighting means (2) may be relatively large and preferably partially overlap at least in one direction. A charge is selectively applied to the picture elements (15) of the second liquid crystal display panel (3) corresponding to the relatively darker portions of the image to be displayed on the first liquid crystal panel (1), so as to at least limit the amount of light reaching these portions of the first liquid crystal display panel (1) and thereby increasing the contrast trio of the device.

Abstract: The present invention relates to a lighting system comprising a plurality of LEDs emitting light with different colors. The LEDs are provided with collimating optical components (51, 55) in order to emit collimated light beams. The LEDs are arranged in at least two layers (43, 45) and the collimating optical components (51) in the front layer are dichroic reflectors, so that they reflect the light from the associated front layer LED but transmit the light emitted from the rear layer behind. This eliminates or reduces the occurrence of colored edges around shadows on an illuminated surface.

Abstract: The present invention relates to a beam switch (1) for an optical imaging system. An at least partially reflecting foil (2), is sandwiched in a slanted position in a space between a first plate (3) and a second plate (4). The switch (1) further comprises a foil electrode (6) associated with said foil (2) and a first transparent electrode (5) associated with said first plate (3) and/or a second electrode (7) associated with said second plate (4). Application of a first voltage potential difference between said foil electrode (6) and at least one of said plate electrodes (5, 7) is arranged to attract said foil (2) towards a position essentially parallel with said first plate (3), in order to reflect light incident on said first plate (3) in a first direction. Application of a second voltage potential difference is arranged to allow said foil (2) to take said slanted position, reflecting light incident on said first plate (3) in a second direction.

Abstract: A display device (500) having a plurality of picture cells (502) is controlled by adding a phase change to the regular cyclic inversion scheme. Thereby, it is possible to overcome the drawbacks of DC build-up due to, e.g., de-interlaced images and images comprising rotating symbols and “ticker tape”. The control involves receiving an image signal comprising image data relating to the picture cells. A respective electric field across each picture cell is controlled, in dependence on at least the image data, according to a first polarity inversion scheme where the polarity of the electric field is such that polarity inversion occurs at regular intervals, and according to a second polarity inversion scheme concurrent with said first polarity inversion scheme, where the polarity of the electric field such that polarity inversion occurs at pseudo-random intervals.

Abstract: The present invention relates to an illumination system (200) including a first sub-system (205) comprising a first set (201) of at least two differently colored light sources where the first set (201) has a first spectral distribution, and a first light mixing device (203) arranged in a direction of emission of light from the first set of light sources and configured to mix light emitted by the first set of light sources. The illumination system further includes a second sub-system (206) comprising a second set (202) of at least two light sources where the second (202) set has a second spectral distribution, and a second light mixing device (204), also arranged in a direction of emission of light from the second set of light sources and configured to mix light emitted by the second set of light sources.

Abstract: A waveguide (40; 51; 61), arranged to guide light from at least one light source (53a-c), the waveguide comprising at least one guiding edge (43; 50a-c; 60) adapted to contain the light in the waveguide (40; 51; 61), and an extraction edge (44; 50d) adapted to enable extraction of the light from the waveguide (40; 51; 61), wherein the guiding edge (43; 50a-c; 60) is configured to reflect the light on its way towards the extraction edge (44; 50d). The guiding edge (43; 50a-c; 60) is further configured such that a direction (xr1, Xr2) of reflection of a ray of light impinging on the guiding edge (43; 50a-c; 60), in a given direction (xi) of incidence relative to a general direction (X0) of extension of the guiding edge (43; 50a-c; 60), is dependent on a position (P1, P2) of incidence along the guiding edge (43; 50a-c; 60). The waveguide may be configured such that virtually no light is lost through back-scattering or unintentional extraction or outcoupling through the at least one guiding edge.

Abstract: An optical separating filter separates impinging light into a first and a second part having different properties. The separating filter comprises reflective filters (FR) arranged in funnel shaped structures (F1). Each one of the structures (F1) have an inlet area (IA1) to receive the impinging light (IL) and an outlet area (OA1) smaller than the inlet area. (IA1) to converge reflected impinging light (RL) towards the outlet area (OA1). The structures (F1) comprise a first group of funnel shaped structures (F1) constructed to reflect light which has a first property (C1) towards their respective first outlet areas (OA1) and for transmitting light which has a second property (C2) towards respective second outlet areas (OA2).

Abstract: A display apparatus comprising a display device (104, 200, 301, 401) configured to display an image is disclosed. The display device comprises a plurality of picture elements, and one or more lenticular means (203). The lenticular means comprises one or more refracting layers (303, 403) configured to direct light emanating from said picture elements in a plurality of directions such that said image of a picture element is divided in two or more essentially identical images.

Abstract: A luminaire comprising a transparent light guiding structure (2), including a stack of transparent, flat panel light guides (3). Each panel light guide has an in-coupling edge (4) adapted to receive light from said light source and couple this light into the light guide, and at least one out-coupling surface (10, 10a) adapted to couple light out of the light guide, wherein the out-coupling surfaces being distributed along a plane of extension of said light guiding structure. The stacked light guiding structure according to the present invention is easy to manufacture even for large sizes, and consists principally of existing elements (flat panel light guides). Also, an improved transparency can be achieved with this design.

Abstract: A brightness enhancing means (5), comprising a collimating means (6) having a receiving area (61), an output area (62) being larger than said receiving area (61), and sidewalls (63) at least partially extending between said receiving and output areas, is provided. At least a portion of the sidewalls (63) of said collimating means (6) comprises a first filter being arranged to reflect light of a first light property, which light is received via said receiving area (61) of said first collimating means (6), towards said output area (62) of said first collimating means (6), wherein said first filter is a dichroic filter or a polarization filter.

Abstract: The invention relates to an illumination module (1) comprising a plurality of light sources (2) distributed over a light guiding plate (3) accommodating said light sources and capable of guiding light of said light sources through at least a portion of said plate. The light guiding plate has one or more out-coupling structures (4), preferably arranged around each light source, so that at least a portion of the light emitted by a first light source (2A) and at least a portion of the light emitted by a second adjacent light source (2B) mix within said light guiding plate before leaving said illumination module as a single substantially collimated mixed light beam. The invention further relates to a lamp and a display apparatus comprising such an illumination module.

Abstract: A contrast enhancement filter for a display device includes a plurality of connected sloping surfaces acting as a plurality of beam splitters, and a plurality of light absorbers, each arranged between adjacent beam splitters, so that light incident into an area on the side of the absorber is partly reflected by the beam splitters into adjacent absorbers. Light entering from the opposite side is partially reflected towards the absorbing walls located on either side of the pointed shape. The remaining light is transmitted through the filter.

Abstract: A display device comprising a first and a second set of electrodes (2, 5), and a plurality of light-emitting elements (3), arranged between said sets of electrodes. The display further comprises an electromechanically operable foil (6), located between said light-emitting elements (3) and said second set of electrodes, with a conducting layer facing the light-emitting elements (3). The foil (6) is arranged to place the conducting layer (7) in contact with selected ones of said light-emitting elements (3), thereby closing a circuit from said first set of electrodes (2), via said elements (3), to said conducting layer (7). Thus, the foil acts as a plurality of “switches”, connecting selected light-emitting elements to the conducting layer. This function can be used for controlling the light-emitting elements with a higher degree of accuracy.

Abstract: A contrast enhancement filter for a display device, comprising an element with a plurality of connected sloping surfaces, acting as a plurality of beam splitters (2, 4). The filter further comprises a plurality of light absorbers (12, 13), each arranged on one side of the element in a pointed space (20, 26) between adjacent beam splitters (2, 4), so that light incident into such a area (20, 26) on the side of the absorber (12, 13) is partly reflected sideways by one of said beam splitters (2, 4) into adjacent absorbers (12, 13). Light entering from the absorber side hits the pointed space, and is partially reflected towards the absorbing walls located on either side of the pointed shape. The remaining light is transmitted through the filter.