Liquid Crystal Display

Liquid Crystal Display

      Disclosed is a Liquid Crystal Display (LCD) which can
be used in both transmittance-type displays and reflective-type
displays.  Between liquid crystal display and backlight, Polymer
Dispersed Liquid Crystal (PDLC), or Cholesteric Nematic Phase Change
Liquid Crystal, is disposed to function as a reflector.

The Figure shows an example of this device:
  1.  is the liquid crystal device, which is a conventional
       twist nematic type, Guest host type, PDLC type, etc..
  2.  is the PDLC reflector which can be applied to a certain
       voltage thereon.  At the ON state, the PDLC reflector
       is transparent so that this display is used as a
       transmittance-type display.  While at the OFF state, the
       PDLC reflector acts as a diffuser so that this display
       is used as a reflective display.
  3.  is a backlight, which is used only as a transmittance
       display.

      The Cholesteric Nematic Phase Change Liquid Crystal is also
applicable as a reflector instead of the PDLC reflector.