Abstract: A display device positions an observer's eye (or eyes) to look in a particular direction (eye path). An electronically controlled image generating element in the eye path generates artificial images which are magnified to create a virtual image for the eye. The image generating element is transparent so that it also passes ambient light from the eye path to the eye.

Abstract: The invention relates to a head-mounted display provided with an image display device and an optical system. The optical system comprises a first &lgr;/4 plate, a lens element, a semi-transmissive mirror, a second &lgr;/4 plate and a polarization-dependent mirror, arranged, in this order, from the incident side for projecting an image to be formed by the image display device on a user's retina.

Abstract: An image display device comprising a light modulation panel, an illumination device arranged opposite the light modulation panel and a light source connected to the illumination device. The illumination device comprises at least one separating layer which has at least one flat surface extending parallel to the light modulation panel and a serrated surface situated on a side which faces away from the flat surface. Said serrated surface includes a number of sawtooth-shaped, juxtaposed projections which are each bounded by a first and a second separating surface, the first separating surface enclosing an acute interior angle with the flat surface and the second separating surface enclosing an obtuse interior angle with the flat surface.

Abstract: A display device (1) comprising a light modulation panel (2), a first polarization layer (5), a first ¼&lgr; layer (6), a semi-transparent reflective layer (7), a lens (8), a second ¼&lgr; layer (11) and a second polarization layer (12). The first ¼&lgr; layer (6) is situated between the first polarization layer (5) and the semi-transparent reflective layer (7). The second polarization layer (12) is a reflective polarization layer. The display device may include a hologram.

Abstract: An LCD projection device is adapted to receive an image signal representing an image to be projected. The device comprises a liquid crystal matrix (2, 11) and a control device (5) converting the image signal (6) into a control signal for the liquid crystal matrix (2, 11). The control device (5) comprises a look-up table (28, 34 to 37) for each pixel (14, 22, 39) of the liquid crystal matrix (2, 11). For given values of the image signal (6), the look-up table (28, 34 to 37) indicates which control signal is associated with a given value (IA, IB) of the image signal (6).

Abstract: A display system (1, 31) is described for positioning at least one eye (3, 33) defining an eye path (4, 34), which display device comprises an image-generating means (5, 37) for generating artificial images, a control system for electronically controlling the image-generating means, and a magnifying optical system (7, 35) for magnifying the artificial images to a virtual image for the at least one eye, wherein the image-generating means is transparent and is present in the eye path for passing external light coming from the ambience of the display device, present in the eye path, to the eye.

Abstract: The invention relates to a compact display device that can be used in small personal devices, such as head-mounted displays, mobile phones and personal digital assistants (PDA). The display device is provided with a light source and a reflective display for forming an object image, and an optical system for projecting a virtual image of the object image. In order to improve the illumination of the reflective display, the display device is provided with a light-guiding means for substantially perpendicular illumination of the reflective display via total reflection.

Abstract: An image display device comprising a light modulation panel, a light conductor arranged opposite the light modulation panel and a light source connected to the light conductor. The light conductor comprises a serrated foil which reflects a light beam emitted by the light source and having a first direction of polarization, and transmits a light beam modulated by the light modulation panel and having a second direction of polarization.

Abstract: A display device (1) comprising a light modulation panel (2), a first polarization layer (5), a first ¼&lgr; layer (6), a semi-transparent reflective layer (7), a lens (8), a second ¼ layer (11) and a second polarization layer (12). The first ¼&lgr; layer (6) is situated between the first polarization layer (5) and the semi-transparent reflective layer (7). The second polarization layer (12) is a reflective polarization layer. The display device may include a hologram.

Abstract: An image display device comprising a light modulation panel, an illumination device arranged opposite the light modulation panel and a light source connected to the illumination device. The illumination device comprises at least one separating layer which has at least one flat surface extending parallel to the light modulation panel and a serrated surface situated on a side which faces away from the flat surface. Said serrated surface includes a number of sawtooth-shaped, juxtaposed projections which are each bounded by a first and a second separating surface, the first separating surface enclosing an acute interior angle with the flat surface and the second separating surface enclosing an obtuse interior angle with the flat surface.

Abstract: An image display device comprising a light modulation panel, a light conductor arranged opposite the light modulation panel and a light source connected to the light conductor. The light conductor comprises a serrated foil which reflects a light beam emitted by the light source and having a first direction of polarization, and transmits a light beam modulated by the light modulation panel and having a second direction of polarization.

Abstract: The invention relates to a head-mounted display provided with an image display device and an optical system. The optical system comprises a first &lgr;/4 plate, a lens element, a semi-transmissive mirror, a second &lgr;/4 plate and a polarization-dependent mirror, arranged, in this order, from the incident side for projecting an image to be formed by the image display device on a user's retina.

Abstract: An acceleration sensor (100) includes a spherical chamber (104) accommodating a spherical member (106) made from an inductance influencing material. The member is inductively coupled to one or more coils (110) outside the chamber. A force on the sensor pulls the member to a certain position in the chamber, which position corresponds to the direction of the force. The position is measured on the basis of the self induction of the coil or coils. In a steady state, the position of the member is representative of the orientation of the sensor with respect to the field of gravity.