Abstract: A color display device comprises a plurality of picture elements (14), at least two light sources, having different radiance spectra and being activated alternately, and color selection means for generating, together with said light sources, primary colors in a color image (P1, P2). Each of a number of image information sets, each set being related to a color image (P1, P2) to be displayed, are divided into a first subframe (A1, A2), being picture element settings to be maintained during the operation of a first light source, and a second subframe (B1, B2), being picture element settings to be maintained during the operation of a second light source. The polarity of the picture elements (14) is, in an alternating manner, shifted between a first polarity (+) and a second polarity (?).

Abstract: A color display device comprises a plurality of picture elements (14), at least two light sources, having different radiance spectra and being activated alternately, and color selection means for generating, together with said light sources, primary colors in a color image (P1, P2). Each of a number of image information sets, each set being related to a color image (P1, P2) to be displayed, are divided into a first subframe (A1, A2), being picture element settings to be maintained during the operation of a first light source, and a second subframe (B1, B2), being picture element settings to be maintained during the operation of a second light source. The polarity of the picture elements (14) is, in an alternating manner, shifted between a first polarity (+) and a second polarity (?).

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: The invention relates to a method for photo-embossing a monomer-containing layer for obtaining a photovoltaic cell, a light emitting diode (LED), or a light emitting electrochemical cell (LEC) by the steps of: (a) optionally providing one or more layers onto the surface of the monomer-containing layer, (b) irradiating through a mask a layer consisting of a homogeneous blend of at least two different compounds, at least one of which is a polymerizable monomer, to obtain a monomer-containing layer with exposed and non-exposed areas; (c) optionally providing further layers onto the surface of the monomer-containing layer; (d) expanding the exposed or the non-exposed areas by diffusing at least one of the monomers to the exposed areas to obtain a corrugated surface of the layer; or interchanging steps c) and d).

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 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 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: The invention relates to an active matrix display system and a method of operating such a system. The system comprises an active matrix display panel and a scanning backlight including several light members (3a-e) each of which illuminates a pixel line or a sector of pixel lines, in a fully activated state (8) of high light intensity for a limited period of time when the pixel lines in that sector have been addressed (6a-e) according to a video signal and have reached a new fully or nearly fully modulated state. This is done to eliminate or reduce the tendency of the so called “Sample and Hold” artefact when displaying fast moving objects on the display. According to the invention the light members (3a-e) are not switched off completely during a time period between two successive fully activated states of high light intensity.