Abstract: The invention relates to a control device for controlling the hue of light emitted by a light source. The control device comprises a hue selection surface capable of displaying one or more hues available for said light of said light source and interaction detection means for detecting interaction between said hue selection surface and a user of said control device in selecting said hue for said light of said light source. The control device allows the user to select the desired hue for the light source simply by interacting with the hue selection surface that displays the available hues. Consequently, the control device can be operated easily and intuitively.

Abstract: The invention relates to a control device (1) for controlling the color of light (L) emitted from a light source (2). The control device comprises color variation means (24) for varying the color of said light emitted from said light source and one or more light-emitting elements (26) arranged to indicate an available color variation range for the color of said light emitted from said light source upon operation of said color variation means. The control device 1 further comprises control means (23) capable of controlling at least one color of the light emitted by said light-emitting elements in dependence on said available color variation range for said light emitted by said light source.

Abstract: The invention relates to a control device (1) for controlling the hue (H) of light (L) emitted by a light source (2). The control device comprises a hue selection surface (20) capable of displaying one or more hues available for said light of said light source and interaction detection means (21) for detecting interaction between said hue selection surface and a user of said control device in selecting said hue for said light of said light source. The control device (1) allows the user to select the desired hue for the light source simply by interacting with the hue selection surface that displays the available hues. Consequently, the control device can be operated easily and intuitively.

Abstract: An electronic brush (10) for dispensing ink (22) onto a writable medium (30) employs an electronic-brush housing (12), at least one ink dispenser (20) coupled to the electronic-brush housing, an electronic-brush scanner (14) coupled to the electronic-brush housing, and a controller (16). The controller is in electrical communication with the ink dispenser and the electronic-brush scanner. A position of the electronic brush is determined based on at least one position indicator in a first portion of a dispensed image that is scanned by the electronic-brush scanner and communicated to the controller. An ink-dispense signal is sent from the controller to the ink dispenser based on the determined electronic-brush position.

Abstract: A mirror assembly (18) for displaying an image (15) in conjunction with the reflection (14?) of a viewer comprises a mirror (2), which is equipped with a reflective polariser (13), arranged to reflect light (3) incident on its viewing side and transmit light (4) incident on its non-viewing side, where the reflected light (3) and transmitted light (4) may be of different polarization. The image (15) is displayed by a device (5) located on the non-viewing side and focused by a focusing element, e.g. one or more lenses (12, 12a), onto an image plane. The image plane may be located between the mirror (2) and viewer (14), so that a perceived image (15?) appears to stand out from the mirror (2). Alternatively, the image plane may be located so that the perceived image (15?) forms a background in which the viewer's reflection (14?) is immersed. The mirror assembly (1) may further comprise one or more detectors (19) for obtaining a silhouette (21) of the viewer (14).

Abstract: An electronic brush (10) for dispensing ink (22) onto a writable medium (30) employs an electronic-brush housing (12), at least one ink dispenser (20) coupled to the electronic-brush housing, an electronic-brush scanner (14) coupled to the electronic-brush housing, and a controller (16). The controller is in electrical communication with the ink dispenser and the electronic-brush scanner. A position of the electronic brush is determined based on at least one position indicator in a first portion of a dispensed image that is scanned by the electronic-brush scanner and communicated to the controller. An ink-dispense signal is sent from the controller to the ink dispenser based on the determined electronic-brush position.

Abstract: The invention provides a system for activating an electronic paint including at least two independently movable ultrasonic transducers (20,22), an electronic brush (30) including an electronic-brush ultrasonic transducer (32), and a controller (40). The controller (40) is operably coupled to the two independently movable ultrasonic transducers (20,22) and the electronic-brush ultrasonic transducer (32). An electronic-brush location with respect to locations of the independently movable ultrasonic transducers (20,22) is determined from ultrasonic signals communicated between the ultrasonic transducers (20,22) and received by the controller (40).

Abstract: A mirror assembly (18) for displaying an image (15) in conjunction with the reflection (14?) of a viewer comprises a mirror (2), which is equipped with a reflective polariser (13), arranged to reflect light (3) incident on its viewing side and transmit light (4) incident on its non-viewing side, where the reflected light (3) and transmitted light (4) may be of different polarisation. The image (15) is displayed by a device (5) located on the non-viewing side and focussed by a focussing element, e.g. one or more lenses (12, 12a), onto an image plane. The image plane may be located between the mirror (2) and viewer (14), so that a perceived image (15?) appears to stand out from the mirror (2). Alternatively, the image plane may be located so that the perceived image (15?) forms a background in which the viewer's reflection (14?) is immersed. The mirror assembly (1) may further comprise one or more detectors (19) for obtaining a silhouette (21) of the viewer (14).

Abstract: A variable size projection screen apparatus inputs an image and generates a beam to project the image on a screen. A sizing facility can resize the image on the screen in at least two different sizes. A motor arrangement can physically resize the screen in a lateral direction to at least two distinct widths.

Abstract: A front projection image display screen has a front and a rear surface. Viewed from the front surface, the screen includes, in this order, a louvre screen and a reflecting or back-scattering surface. An incident angle-dependent transparent or translucent foil is at the light-incident side of the louvre screen.

Abstract: Color projection system includes a light source, an integrator plate arranged in front of the light source and having a plurality of juxtaposed lens elements, an electro-optical light modulation panel arranged in front of the integrator plate, a projection lens preceding the light modulation panel, and a movable color filter which is provided with a plurality of parallel extending, differently colored strips. The color filter is located opposite the integrator plate, which color filter and integrator plate are movable relative to each other in a direction extending parallel to the integrator plate, while at least two differently colored strips are located opposite each lens element, while strips of the same color have the same position with respect to each lens element.

Abstract: A method and circuit for detecting arc instabilities in a high pressure gas discharge lamp. The method and circuit rectify and low pass filter the lamp voltage to obtain a quasi-rms voltage having recurrent periods with first zones containing spurious noise from switching of inverter switches and broad second zones, between the first zones, which are substantially free of spurious noise. The quasi-rms voltage is sampled only during the second zones, so that the samples have a high information-to-noise ratio. The sample signal may be used in a variety of methods to detect and control arc instabilities in gas discharge lamps.

Abstract: Display device (1) comprising an illumination system (3) having a radiation source (17; 31, 35) for supplying a radiation beam. The display device (1) also comprises a diffusing display panel (5). This panel (5) consists of an optically active diffusing medium (7) which is switchable between a transparent, polarization-maintaining state and a diffusing, depolarizing state for the radiation beam. The medium (7) is present between a first polarizer (9) having a first state of polarization and a second polarizer (11) having a second, complementary state of polarization. At least the first polarizer (9) is a reflecting polarizer and polarization-converting means (10) are arranged at a side of the first polarizer (9) facing away from the display panel (5).

Abstract: A variable duration method for controlling a high pressure gas discharge lamp to avoid arc instabilities caused, for example, by acoustic resonance. The method controls the lamp at different operating frequencies so that it stays longer at frequencies which are stable while only staying for very short times at frequencies where the arc is unstable. The method and apparatus operate the lamp at a plurality of operating frequencies and determine a stability factor for each frequency by recurrently sampling an electrical lamp parameter during operation at each frequency. The stability factor corresponds inversely to a deviation in the sensed electrical parameter, so that frequencies with little arc instability have a high stability factor and are selected more frequently for operating the lamp than are frequencies having arc instabilities, which will have low stability factors.

Abstract: A display device (1) has a display panel (2) which comprises a first substrate (6) on which a first picture electrode (11-27) is provided as well as a substantially parallel second substrate (7) on which a second picture electrode (20) is provided, both substrates (6, 7) sandwiching an electro-optical medium (8). Said electro-optical medium (8) is capable of switching between an at least substantially transparent state and a scattering state under the influence of an electric field. A transparent insulating layer (10) is provided between the first picture electrode (11-17) and the electro-optical medium (8), said insulating layer reflecting the light (30) which, at least during operation, is emitted by a light source (3) and sidelong captured by the panel (2), so that it does not reach the first picture electrode (11-17).

Abstract: A display device (1) has a display panel (2) which comprises a first substrate (6) on which a first picture electrode (11-27) is provided as well as a substantially parallel second substrate (7) on which a second picture electrode (20) is provided, both substrates (6, 7) sandwiching an electro-optical medium (8). Said electro-optical medium (8) is capable of switching between an at least substantially transparent state and a scattering state under the influence of an electric field. A transparent insulating layer (10) is provided between the first picture electrode (11-17) and the electro-optical medium (8), said insulating layer reflecting the light (30) which, at least during operation, is emitted by a light source (3) and sidelong captured by the panel (2), so that it does not reach the first picture electrode (11-17).

Abstract: An Rf coil system for the detection of MR resonance signals is constructed from a first system of coils for making an overall picture and a second coil system which covers substantially the same area, consists of several coils and for local imaging having a higher resolving power. In particular the latter coils preferably include magnetic resonance sensitive material which become visible on an image formed from detected MR resonance signals for indicating the position of each coil.

Abstract: In a magnetic resonance apparatus coils of an rf coil system are incorporated for detection of magnetic resonant signals at mutually different frequencies in resonant circuits having a zero impedance for the natural frequency and an infinite impedance for a given deviating frequency. In the switching circuits a coaxial cable is used having a length which has a reactance in parallel with a second reactance to form a tuned circuit adapted to the desired frequency.