LCD system for viewing projected stereo slides

[Alan.Hancock@xxxxxx]

Michael Kaplan <MKAPLAN@xxxxxxxxxxxxx> wrote:

>>        Incidentally, has anyone developed an LCD system for viewing
>>        projected *slides*?

          I have been thinking about experimenting with this as I have
          home built systems to display stereo images on a PC screen
          using LCD glasses. It may be possible to use the LCD
          shutter elements from a set of 3DTV, SEGA or TOSHIBA glasses
          to insert into the light path of a stereo projector or
          synchronized double projector system. A circuit could easily
          be made to control the switching of the LCD shutters at say
          60Hz in the projector and the viewing glasses simultaneously
          i.e. when the right image projector is switched to blank the
          passage of light then the viewing glasses are also switched
          to blank out the right eye.

          Yet another possibility is to utilize LCD displays of the
          type used in LCD TV sets and HMDs the virtual reality type.
          You can put one of these elements into a easily converted
          standard projector and arrange that a computer displays on
          the LCD matrix (mounted in the projector) via a VGA to
          NTSC/PAL video adapter that does not do line averaging to
          'improve' the image. Frame line interlaced stereo pairs can
          easily be created as a single graphic image via software and
          output to the LCD matrix via a PC VGA card that has a VGA
          feature connector connected to a special circuit to drive
          any number of LCD shutter glasses. The LCD shutter glasses
          are synchronized to alternate lines in the image via the PC
          card (a card of this type is made by KASAN and is used my
          the 3DMAX system). The advantage of this type of 3D system
          is that an ordinary projection screen can be used. If not
          using projection the viewer(s) with LCD shutter glasses can
          just look at a high resolution computer display which can be
          easily transportable .


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