Reflex Liquid Crystal Display Device, Display Apparatus, Projection Optical System, and Projection Display System

A projection display system, wherein a reflex liquid crystal display is disposed in an optical path thereof, said reflex liquid crystal device including:

• a first substrate with a transparent electrode;
• a second substrate with a light reflective electrode;
• and
• a layer of vertically-aligned liquid crystal material interposed between said first and second substrates positioned opposite to each other in a state where said transparent electrode and said light reflective electrode have mutually opposed surfaces,
• wherein the thickness of said vertically-aligned liquid crystal layer is equal to or less than 2 μm, and the refractive index anisotropy Δn of said liquid crystal material is equal to or more than 0.1, and said liquid vertically-aligned liquid crystal layer includes a plurality of liquid crystal molecules each having a pre-tilt angle controlled within a range of 1° to 7°.

A projection display system, wherein a reflex liquid crystal display device and a first optical unit having an F number under 3, are disposed in an optical path thereof, said reflex liquid crystal display device including;

• a first substrate with a transparent electrode;
• a second substrate with a light reflective electrode;
• and
• a layer of vertically-aligned liquid crystal material interposed between said first and second substrates positioned opposite to each other in a state where said transparent electrode and said light reflective electrode have mutually opposed surfaces,
• wherein the thickness of said vertically-aligned liquid crystal layer is equal to or less than 2 μm, and the refractive index anisotropy Δn of said liquid crystal material is equal to or more than 0.1, and said liquid vertically-aligned liquid crystal layer includes a plurality of liquid crystal molecules each having a pre-tilt angle controlled within a range of 1° to 7°.

A projection optical system wherein a reflex liquid crystal display is disposed in an optical path thereof, said reflex liquid crystal device including;

• a first substrate with a transparent electrode;
• a second substrate with a light reflective electrode;
• and
• a layer of vertically-aligned liquid crystal material interposed between said first and second substrates positioned opposite to each other in a state where said transparent electrode and said light reflective electrode have mutually opposed surfaces,
• wherein the thickness of said vertically-aligned liquid crystal layer is equal to or less than 2 μm, and the refractive index anisotropy Δn of said liquid crystal material is equal to or more than 0.1, and said liquid vertically-aligned liquid crystal layer includes a plurality of liquid crystal molecules each having a pre-tile controlled within a range of 1° to 7°.

A reflex liquid crystal display device comprising;

• a first substrate with a transparent electrode;
• a second substrate with a light reflective electrode;
• and
• a layer of vertically-aligned liquid crystal material interposed between first and second substrates positioned opposite to each other in a state where said transparent electrode and said light reflective electrode have mutually opposed surfaces;
• wherein the thickness of said vertically-aligned liquid crystal layer is less than 2.0 μm and equal to or more than 1.5 μm, and the refractive index anisotropy Δn of said liquid crystal material is equal to or more than 0.1.