Stylus position sensing and digital camera with a digital micromirror device
First Claim
1. An apparatus for sensing position of a stylus relative to a projected image where a digital micromirror device (DMD) array is used for projecting said image upon a surface, said DMD array including a plurality of controllable pixel mirrors, said image created by directing light from a first light source onto said DMD array which controllably reflects said directed light through an optical system onto said surface, said image comprised of a plurality of sequentially projected frame images where there is a finite time duration between successive projected frame images, said apparatus comprising:
- a second light source and a means for illuminating said surface with light from said second light source;
said stylus including a reflector for reflecting said second light source light from said surface back towards said surface;
energizing means for scanning by selectively energizing said plurality of controllable pixel mirrors during said finite duration between successive projected frame images;
a detecting means for detecting the presence of said reflected second source light on said surface when reflected by at least one of said controllable pixel mirrors; and
address means, responsive to said detecting means and said energizing means, for providing a stylus position output when said detecting means detects said reflected second source light from said surface during said finite duration.
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Accused Products
Abstract
Disclosed is a digital micromirror device (DMD) based projector in which the position of a stylus with respect to a projected image can be determined automatically. In one embodiment, the stylus includes a detector capable of detecting illumination from a single pixel and the plurality of pixels in the DMD array are sequentially energized until a pixel reflects light to the stylus detector. Since the location of that pixel is known, the position of the stylus adjacent that pixel on the image is also known. In another embodiment, light is emitted from the stylus and the DMD array is sequenced in order to reflect light from the array to a photodetector. Again, when a pixel is sequenced so as to reflect light to the detector, the position of the stylus with respect to the image is related to the image of the pixel with respect to the pixel'"'"'s location in the array. A further embodiment utilizes a general illumination source of the screen with infrared radiation and a reflective stylus which reflects the infrared radiation back to the DMD array. As before, sequencing of the DMD array and detection of the pixel associated with the reflected IR radiation provides an indication of the stylus location. In a further embodiment, a DMD array is utilized to sequentially address all of the pixels of a subject image thereby providing an output of each sequenced pixel to a data storage device forming a digital camera.
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Citations
24 Claims
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1. An apparatus for sensing position of a stylus relative to a projected image where a digital micromirror device (DMD) array is used for projecting said image upon a surface, said DMD array including a plurality of controllable pixel mirrors, said image created by directing light from a first light source onto said DMD array which controllably reflects said directed light through an optical system onto said surface, said image comprised of a plurality of sequentially projected frame images where there is a finite time duration between successive projected frame images, said apparatus comprising:
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a second light source and a means for illuminating said surface with light from said second light source; said stylus including a reflector for reflecting said second light source light from said surface back towards said surface; energizing means for scanning by selectively energizing said plurality of controllable pixel mirrors during said finite duration between successive projected frame images; a detecting means for detecting the presence of said reflected second source light on said surface when reflected by at least one of said controllable pixel mirrors; and address means, responsive to said detecting means and said energizing means, for providing a stylus position output when said detecting means detects said reflected second source light from said surface during said finite duration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for sensing position of a stylus relative to a projected image where a digital micromirror device (DMD) array is used for projecting said image upon a surface, said DMD array including a plurality of controllable pixel mirrors, said image created by directing light from a first light source onto said DMD array which controllably reflects said directed light through an optical system onto said surface, said image comprised of a plurality of sequentially projected frame images where there is a finite time duration between successive projected frame images, said apparatus comprising:
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a second light source for illuminating said surface with second source light from said second light source; said stylus including a reflector for reflecting said second source light from said surface back towards said surface; a DMD driver for scanning by selectively energizing said plurality of controllable pixel mirrors during said finite duration between successive projected frame images; a detector for detecting the presence of said reflected second source light on said surface when reflected by at least one of said controllable pixel mirrors; and X-Y position calculator, responsive to said detector and said DMD driver, for providing a stylus position output when said detector detects said reflected second source light from said surface during said finite duration. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification