Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Patent
1995-06-07
1998-11-03
Shankar, Vijay
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
345179, 178 1801, 178 1809, 178 1901, 348771, G08C 2100, G09G 500, G02F 100
Patent
active
058316019
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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Davis Giles K.
Vogeley Arthur W.
Vogeley James H.
n-View Corporation
Shankar Vijay
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