Abstract: Image displaying and picking-up device having an imgae picking-up component in the backside of the liquid crystal panel.

Abstract: An image pick-up and projection apparatus comprising a projection unit (14), a pick-up unit (11) and a projection screen (9) switchable between a transmissive state and a diffusing state. By arranging an array (15) of elongated prismatic elements on the front surface of the screen, the contrast of the projected image is enhanced and it is avoided that a user (12) can simultaneously see the front of the projection unit and the front of the pick-up unit.

Abstract: In an image pick-up and display apparatus comprising a liquid crystal display device (34), an image pick-up device (24) and a partially transparent mirror (36), the display device is arranged at the front side of the apparatus (30), the partially transparent mirror is disposed behind this device (32) in light paths respectively between the display device and the light source (38) for illuminating this display device and between the image pick-up device (24) and the display device (32), so that the received image can be displayed in a natural way and the optical information of a subject in front of the apparatus is not disturbed by light from the light source.

Abstract: A color display apparatus which stores the color information of characters to be displayed in three storage planes (4R, 4C, 4B) of a character generator so that this information can be used in a display controller (21) in such a way that high-quality characters are displayed on a display panel. The information is stored so that different sequences of 3-bit color dots can be displayed.

Abstract: An image projection display and pick-up apparatus includes a display screen with controllable tranmissivity, and image projection device behind the screen for projecting an image onto the rear surface of the screen, and an image pick-up device, also located behind the screen, for picking up an image of a viewer located in front of the screen, and an optical shutter for preventing light from the projection device to reach the screen during image pick-up.

Abstract: An active display device with picture elements (9) arranged in a matrix is driven via active switches (1). Part of the picture electrodes (9) are driven via light per actuated switches (9) between the picture electrodes and a read-out electrode (5).

Abstract: A beam of light from a light source is reflected by a polyhedral mirror which is continuously rotating in a constant speed around its axis. The reflected beam sweeps on an object and passes a predetermined point of the object surface. A dispersed light from the point is formed into a beam through a set of slits and reaches a light detector.The polyhedral mirror has a plurality of mirror surfaces each of which is spaced at a distance from the rotary axis thereof, different from the adjacent mirrors.A pair of targets are arranged in the beam axis to the light detector. Dispersed light beams from both upper and lower targets also reach into the light detector.

Abstract: A beam of light from a light source is reflected by a polyhedron mirror which is continuously rotating around its axis. The reflected beam sweeps on an object and passes a predetermined point of the object surface. A dispersed light from the point is formed into a beam through a set of slits and reaches into a light detector.The polyhedron mirror has a plurality of mirror surfaces each of which is spaced at an independent distance from the rotary axis thereof.The distance between the predetermined point of the object and the beam line from the light source is computed by using the distances of the mirror surfaces from the rotary axis of the polyhedron mirror and the inclination angles of the mirror surfaces from the beam line, at which angles the reflected beam hits the predetermined point.