摘要:
A laser beam is swept by a scan mirror as a pattern of scan lines on a projection surface. The scan mirror moves at a variable speed along each scan line. Each scan line has a number of pixels. The pixels have time durations proportional to the variable speed of the scan mirror. A profile memory stores the time durations of the pixels. A controller causes selected pixels arranged along each scan line to be illuminated for the time durations stored by the profile memory to produce an image of uniform brightness and of uniformly sized pixels and in color.
摘要:
An acousto-optical modulator modulates a green laser beam, and generates a modulated non-diffracted beam and a modulated diffracted beam. A scanner sweeps the modulated diffracted green beam, as well as modulated red and blue beams, as a pattern of scan lines, each scan line having a number of pixels. A controller causes selected pixels along the scan lines to be illuminated, and rendered visible, by the diffracted green beam, the red beam and the blue beam to produce the image. The non-diffracted green beam is employed in a laser shut-down safety circuit.
摘要:
A method and apparatus are provided to capture images using a laser projection display (LPD). In a full color LPD camera, three lasers (red, blue, and green) are deployed to scan an image and receive reflected laser light therefrom. The reflected laser light may be analyzed and assembled into a picture. The LPD may also be used to display the picture, to operate as a viewfinder, to print the picture, to operate as a range finder, and the like.
摘要:
An arrangement for determining light beam position in an electro-optical reader, image projector and like devices includes a drive for moving a scanning light beam at a scan frequency across a target as a scan line, and an electro-optical feedback assembly operatively connected to the drive, for optically detecting scan line position during beam movement, and for generating a feedback signal at the scan frequency, the feedback signal being indicative of the scan line position. A feedback coil in the drive is eliminated to avoid electromagnetic coupling between multiple coils in the drive.
摘要:
An image projector is supported by a vehicle to project a two-dimensional image on a projection surface, such as a portion of a windshield, an instrument panel, or a seat back, within the vehicle, for viewing by an occupant of the vehicle.
摘要:
A lightweight, compact image projection module, especially for mounting in a housing having a light-transmissive window, is operative for causing selected pixels in a raster pattern to be illuminated to produce an image of high resolution of VGA quality in color. A data signal on a pattern of odd and even scan lines in the pattern is synchronized with movement of a scan mirror operative to sweep a light beam along each scan line to align all the scan lines.
摘要:
A plurality of image projection modules is operative for causing selected pixels in overlapping raster patterns to be illuminated to produce a large size image of high resolution of VGA quality in monochrome or color. The selected pixels in an overlap region of the patterns are illuminated at a lesser intensity to provide uniform brightness over the image. Multiple single mode lasers, or a multimode laser with an aperture stop, are employed to increase laser output power. Speckle noise is reduced by controlling the optical transmission characteristic of a projection screen. Three-dimensional images are generated by moving the screen. Cross-coupling between drive and feedback mechanisms in image projection is reduced for better image quality.
摘要:
An apparatus is provided for controlling a laser projection device (LPD). The apparatus is comprised of a liquid crystal display controller, a laser projection display controller, and a laser projection display engine. The liquid crystal display controller is adapted to receive video signals indicative of a visual display and convert the video signals to control signals suitable for controlling a liquid crystal display panel. The laser projection device controller is adapted to receive the control signals from the liquid crystal display controller and use the control signals to control a laser projection display. The laser projection device engine is adapted to display an image under the control of the laser projection device controller.
摘要:
A method and apparatus are provided to controllably reduce power of a laser projection display (LPD) in response to detecting a variation in a viewing surface. During the operation of the LPD, a controller 142 monitors laser light being reflected from the viewing surface. Since the controller 142 “knows” the amount of power that the LPD is being instructed to deliver, it may compare the known power to the reflected laser light to determine if a foreign object may be in the path of the laser light, and therefore, affecting the magnitude of the laser light. The controller 142 responds to detecting such an event by reducing power to the lasers.
摘要:
The present invention is a control apparatus for guiding toy vehicles on a roadway. Preferably, a remote control hand unit is employed that is most preferably optoelectric. The hand unit includes a plurality of direction keys that transmit signals from the hand unit based on their electronic interconnection with an infrared LED and a laser transmitter in the hand unit. The hand unit transmits directional commands to control movement of a toy vehicle through the intersection of a roadway. These control commands are transmitted via a modulated infrared signal that is received by an infrared sensor adjacent the roadway. Additionally, the hand unit transmits a location laser signal to one of many reception points, i.e., laser detectors, located adjacent each road at an intersection.