Abstract:
A MEMS micro-mirror assembly (250, 300, 270, 400) comprising, a MEMS device (240) which comprises a MEMS die (241) and a magnet (231); a flexible PCB board (205) to which the MEMS device (240) is mechanically, and electrically, connected; wherein the flexible PCB board (205) further comprises a first extension portion (205b) which comprises a least one electrical contact (259a,b) which is useable to electrically connect the MEMS micro-mirror assembly (250, 300, 270, 400) to another electrical component). There is further provided a projection system comprising such a MEMS micro-mirror assembly (250, 300, 270, 400).
Abstract:
According to the present invention there is provided a projection device, which is configured to project an image which is co-operable with images projected by one or more other projection devices, wherein the projection device comprises a detector operable to detect characteristics of images projected on a display surface by the projection device and one or more other projection devices, and a controller operable to adjust the projection device and/or to adjust one or more of the other projection devices, based on the characteristics of the images detected by the detector, such that the images projected by each projection device co-operate on the display surfaces.
Abstract:
The present invention concerns a method and an apparatus for controlling a MEMS micro-mirror device. The invention enables the control of the micro-mirror deflection angle and of the micro-mirror scanning frequency, essential for the projection as it relates directly to the size of the projected image. The MEMS micro-mirror device has a fixed part (102) and a micro-mirror (100) that can oscillate along at least one oscillation axis, a magnet (200) either placed next to said fixed part (102) or on the said movable part (100) and a sensing coil (202) placed on said moving part (100) or on said fixed part (102). A detecting circuit detects at least one value (Uιnd) of the inducted voltage in said sensing coil (202) for each period and for each oscillation axis, and a calculating circuit (404) calculates the amplitude of the movement of said micro-mirror (100) by means of said value (Umd)- Another independent electrical drive coil can be used in order to have two independent electrical coils respectively for driving the micro- mirror and for sensing its positions. The invention can prevent an unexpected default of the projection system.
Abstract:
La présente invention concerne un procédé pour actionner une structure résonante dans un microsystème électromécanique. La fréquence de résonance de la structure résonante mécanique peut se varier entre une fréquence de résonance minimale et une fréquence de résonance maximale définissant une bande de fréquence de résonance. Le procédé comprend: la génération (21) d'un premier signal d'actionnement périodique à une première fréquence; la génération (23) d'un deuxième signal d'actionnement périodique à une deuxième fréquence; le sélection (25) du premier signal d'actionnement et/ou du deuxième signal d'actionnement; et l'application (31) successivement du premier signal d'actionnement et du deuxième signal d'actionnement ou simultanément d'une combinaison du premier signal d'actionnement et du deuxième signal d'actionnement à la structure résonante pour faire osciller la structure résonante à sa fréquence de résonance. La première fréquence se trouve au-dessous de la bande de fréquence de résonance alors que la deuxième fréquence se trouve au-dessus de la bande de fréquence de résonance. De cette manière on peut faire osciller la structure résonante à sa fréquence de résonance.
Abstract:
L'invention concerne un micro-volet à actionnement électromagnétique comportant une plaquette mobile (1) en rotation autour d'un axe (11), reliée à un cadre fixe (3) par deux bras (7, 9) alignés de part et d'autre de la plaquette selon ledit axe (11), et comportant à sa périphérie une boucle conductrice (13) ; et sous l'ensemble formé par le cadre fixe et la plaquette mobile, un ensemble d'aimants (51, 53, 55) d'orientations magnétiques distinctes, disposés de façon à créer, au niveau de la plaquette mobile, un champ magnétique latéral (57), dans le plan du cadre, oblique par rapport à l'axe de rotation.
Abstract:
A projection device comprising, a red light source, a green light source, and a blue light source which can emit red, green and blue light respectively, a beam combiner which is configured such that it can combine light beams; a means for collimating the light emitted from the red, green and blue light sources to provide red, green and blue collimated light beams, an optical modifier means, which is arranged such that the optical modifier means can receive the red, green and blue collimated light beams, and wherein the optical modifier means is configured to modify cross sectional dimensions of the red, green and blue collimated light beams to provide red, green and blue projection beams each of which has a circular cross section, and wherein the optical modifier means is configured, and the distances between the light sources and means for collimating are set, such that the dimensions of the circular cross sections of the red, green and blue projection beams are equal at a predetermined distance from the projection device such that the spot sizes of each of the red, green and blue projection beams are equal or have predefined sport sizes at the predetermined distance from the projection device; MEMS mirror which is configured such that it can oscillate about at least one oscillation axis to scan the red, green and blue projection beams across a projection screen which is positioned at the predetermined distance from the projection device.
Abstract:
The present invention provides a projection system (10), preferably for a head-up display e.g. on board a vehicle, comprising a laser source (1), a diffuser (3) and telecentric optics (2) disposed between the laser and the diffuser so that the telecentric optics outputs parallel rays to the diffuser, the diffused light being thus independent from the incidence angle; each pixel of the projected image has the same brightness, regardless of the angle or of the position from which it is viewed.
Abstract:
According to the present invention there is provided a method of projecting an image, the method comprising the steps of, providing light signal which is configured such that it can be projected onto a display surface to display an image; oscillating a first reflective surface, to scan the light signal over the display surface, using an actuator which is in operable co-operation with the first reflective surface, by applying a first actuation signal to the first reflective surface, wherein a rise time or fall time of the first actuation signal is inversely proportional to a resonant frequency of oscillation of the first reflective surface.
Abstract:
According to the present invention there is provided a method for projecting an image on to a display surface, comprising the steps of, providing two or more projection systems; arranging the two or more projection systems such that they each project an image on a display surface; off-setting an oscillating reflective surface within at least one of the two or more projection systems such that the image projected by each of the two or more projection systems are in co-operation on the display surface.