Abstract: An electroluminescent device includes a substrate and a laminated body composed of a first electrode, an electroluminescent layer and a second electrode. The light output out of the electroluminescent device is increased by arranging a colloidal layer between the substrate and the laminated body. By using pigments in the colloidal layer, the emission color of the electroluminescent device can be changed and the daylight contrast improved.

Abstract: The invention relates to an electroluminescent device comprising a substrate (1) and a laminated body composed of a first electrode (3), an electroluminescent layer (4) and a second electrode (5). The light output out of the electroluminescent device is increased by arranging a colloidal layer (2) between the substrate (1) and the laminated body. By using pigments in the colloidal layer (2), the emmission color of the electroluminescent device can be changed and the daylight contrast improved.

Abstract: An illumination system comprising, a) a light source; b) a light-directing assembly (1) in close proximity to the light source and comprising a plurality of microprisms (6), each microprism comprising an input surface (7) that admits light radiating from the light source, an output surface (8) distal from and parallel to the input surface (7), and at least one sidewall (9) disposed between and contiguous with the input and output surfaces and forming an obtuse tilt angle with respect to the input surface (7) and further positioned for effecting total reflection of the light rays received by the input surface (7), the sidewalls (9) of the microprisms (6) defining interstitial regions (10) between the microprisms (6); c) at least one blocking means (11) positioned to block the passage of light through the sidewalls (9); and d) an optical means (2, 3, 4) located between the light source and the light-directing assembly (1), with the special feature that e) said optical means (2, 3, 4) comprise a reflective powde

Abstract: In an UV-reflecting layer for discharge lamps, the layer comprises at least 0.1% by weight of Al2O3 and at least 0.1% by weight of a material having a higher refractive index than Al2O3, so that as large a proportion of UV light as possible can be reflected and as large a portion of visible light as possible can be emitted by the lamp.

Abstract: A light-collimating system for collimating light from a light source has a plurality of elements (2, 2?, . . . ), each element including at least a first wall (3, 3?, . . . ) and at least a second wall (4, 4?, . . . ). The first (3) and second wall (4?) of adjacent elements are spaced with respect to each other at a side of the light-collimating system facing the light source, the spacing defining an aperture window (5, 5?, . . . ) for admitting light into the light-collimating system. The first and second wall of said adjacent elements form a wedge-shaped structure widening in a direction facing away from the light source. The first and the second wall are provided with a specular reflecting surface at a side facing the wedge-shaped structure. According to the invention, the wedge angle (w of the first and second wall with respect to the normal on the aperture window are adjustable for enabling adjustable collimation.

Abstract: The invention relates to a liquid crystal picture screen provided with a background lighting system which comprises at least one light source and a collimator formed by hourglass-shaped microprisms. The light of the light source can be effectively collimated within a desired angular range by means of the collimator.

Abstract: An illumination system comprising, a) a light source; b) a light-directing assembly (1) in close proximity to the light source and comprising a plurality of microprisms (6), each microprism comprising an input surface (7) that admits light radiating from the light source, an output surface (8) distal from and parallel to the input surface (7), and at least one sidewall (9) disposed between and contiguous with the input and output surfaces and forming an obtuse tilt angle with respect to the input surface (7) and further positioned for effecting total reflection of the light rays received by the input surface (7), the sidewalls (9) of the microprisms (6) defining interstitial regions (10) between the microprisms (6); c) at least one blocking means (11) positioned to block the passage of light through the sidewalls (9); and d) an optical means (2, 3, 4) located between the light source and the light-directing assembly (1), with the special feature that e) said optical means (2, 3, 4) comprise a reflective powde

Abstract: A plasma color screen fitted with a carrier plate, a transparent front plate, a ribbed structure dividing the space between the carrier plate and the front plate into discharge cells filled with a gas, with one or more electrode arrays on the front plate and on the carrier plate to generate corona discharges in the discharge cells and with a segmented phosphor layer, which plasma color screen comprises a pixel matrix array in which are grouped discharge cells for red, green and blue to form a pixel, where each pixel comprises a discharge cell for blue which is common to two adjacent pixels.

Abstract: A light-collimating system for collimating light from a light source has a plurality of elements (2, 2?, . . . ), each element including at least a first wall (3, 3?, . . . ) and at least a second wall (4, 4?, . . . ). The first (3) and second wall (4?) of adjacent elements are spaced with respect to each other at a side of the light-collimating system facing the light source, the spacing defining an aperture window (5, 5?, . . . ) for admitting light into the light-collimating system. The first and second wall of said adjacent elements form a wedge-shaped structure widening in a direction facing away from the light source. The first and the second wall are provided with a specular reflecting surface at a side facing the wedge-shaped structure. According to the invention, the wedge angle (w of the first and second wall with respect to the normal on the aperture window are adjustable for enabling adjustable collimation.

Abstract: A light-collimating system for collimating light from a light source has a plurality of elements (2, 2?, . . . 12, 12?, . . . ). Each element includes a first wall (3, 3?, . . . ; 13, 13?, . . . ) and a second wall (4, 4?, . . . ; 14, 14?, . . . ). The first wall and the second wall of each element are spaced with respect to each other. The first wall (3; 13) of an element (2; 12) and the second wall (4?; 14?) of an adjacent element (2?; 12?) form a wedge-shaped structure widening in a direction facing away from the light source. The first and second wall are at a side facing the wedge-shaped structure provided with a specular reflecting surface. Preferably, the space formed between the first and second wall of each element and the supporting member is provided with a specular and/or diffuse reflecting material.

Abstract: In an UV-reflecting layer for discharge lamps, the layer comprises at least 0.1% by weight of Al2O3 and at least 0.1% by weight of a material having a higher refractive index than Al2O3, so that as large a proportion of UV light as possible can be reflected and as large a portion of visible light as possible can be emitted by the lamp.

Abstract: In an UV-reflecting layer for discharge lamps, the layer comprises at least 0.1% by weight of A12O3 and at least 0.1% by weight of a material having a higher refractive index than A12O3, so that as large a proportion of UV light as possible can be reflected and as large a portion of visible light as possible can be emitted by the lamp.

Abstract: The invention relates to a liquid crystal picture screen provided with a background lighting system which comprises at least one light source and a collimator formed by hourglass-shaped microprisms. The light of the light source can be effectively collimated within a desired angular range by means of the collimator.

Abstract: The invention describes a color picture screen with an enhanced contrast. The color picture screen comprises a color filter layer between the picture screen glass and the phosphor layer, which filter layer comprises a red pigment in the areas of the red phosphors, a blue pigment in the areas of the blue phosphors, and a blue or a red pigment in the areas of the green phosphors.

Abstract: A plasma picture screen is disclosed. In one embodiment, an AC plasma picture screen with a coplanar arrangement which has an enhanced luminance is provided. A layer, which has a high reflection in the wavelength range of the plasma emission (145 to 200 nm) and a high transmission in the visible wavelength range, is provided on the front plate. The front plate includes a glass plate on which a dielectric layer, a protective layer, a reflective layer are provided. The reflective layer reflects UV light emitted in the direction of the front plate back towards phosphors. The optical properties of the UV light reflecting layer are realized with inorganic particles with a particle diameter of between 200 nm and 500 nm and a layer thickness from 0.5 &mgr;m to 5 &mgr;m, or with agglomerates of inorganic particles with a particle diameter of between 10 nm and 200 nm and a layer thickness of 0.2 &mgr;m to 10 &mgr;m.

Abstract: A plasma display panel having a structured black matrix (8) which is coated with a reflecting layer (9) on the side turned away from the viewer. Visible light incident from outside is absorbed by the black matrix (8) and light incident from inside is reflected by the reflecting layer (9). This enhances the LCP value of the whole plasma screen. A protective layer (5) such as MgO is deposited on the black matrix and reflecting layer and so formed over the black matrix and said reflecting layer so as to reduce undesired reactions of the black matrix and the reflecting layer with the dielectric layer, such as during high temperature conditions during manufacture.

Abstract: The invention relates to a plasma picture screen with a improved white color point. The front plate (1) of the plasma picture screen has a blue layer on the side facing the plasma discharge. This may be the dielectric layer (4), the protective layer (5), or an additional layer.

Abstract: A plasma picture screen, in particular an AC plasma picture screen with a coplanar arrangement having an enhanced luminance. A UV light emitting layer (8) is provided on the front plate (1), which comprises a glass plate (3) on which a dielectric layer (4) and a protective layer (5) are provided, or on the carrier plate (2) with the phosphor (10). The layer (8) comprises a VUV phosphor which converts the VUV light of the plasma discharge into UV light with a wavelength between 200 and 350 nm and emits this in the direction of the phosphor layer (10).

Abstract: The invention describes a cathode ray tube in which the position of the electron beam (7, 8, 9) is determined in that detection strips (12, 13) are arranged between or below the individual phosphor strips of the phosphor layer (11). The detection strips (12, 13) each comprise a semiconductor component which amplifies the measured current signal. This renders the position determination of the electron beam (7, 8, 9) more definite and reproducible.

Abstract: The invention relates to a plasma picture screen with a improved white color point. The front plate (1) of the plasma picture screen has a blue layer on the side facing the plasma discharge. This may be the dielectric layer (4), the protective layer (5), or an additional layer.