Appeal No. 1996-1387 Page 2
Application No. 08/110,269
The invention at issue in this appeal relates to optical
projection displays. A light source produces light, which is
collimated by a lens. The collimated light is passes to
a liquid crystal (LC) shutter. The incoming light is
modulated by the LC shutter and projected onto a display
screen. A matte surface and digitizing grid are carried by
the screen. The surface acts as a diffusive element for
displaying an image. The grid detects the position of a
pointer near the screen.
Claim 23, which is representative for our purposes,
follows:
23. An optical projection system, comprising:
a) a liquid-crystal shutter, in which
transmissivity of pixels is controlled by
application of electric fields;
b) a light source for projecting light through
the shutter;
c) a display screen on which the projected light
produces an image; and
d) a plurality of conductors associated with the
display screen, for use in detection of position of
a stylus.
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Next
Last modified: November 3, 2007