Liquid crystal display apparatus and optical device for use therein

A liquid crystal display apparatus, comprising:

• an optical source system for emitting projection light;
• a plurality of liquid crystal display portions, for receiving the emission light from said optical source of the optical system and for generating a projection picture depending upon a driver signal;
• a projection optical system for composing and for projecting the light emitted from said plurality of liquid crystal display portions towards an projection object, wherein:
• said optical source system has a light source and an optical separation system for dividing and emitting the light emitted from the light source towards said plurality of liquid crystal display portions;
• and
• said projection optical system has a first optical element for composing lights emitted from said plurality of liquid crystal display portions and a second optical element for projecting the light composed, and further, each of said liquid crystal display portions comprises:
• a liquid crystal display element for generating the picture;
• an incident side polarizing element being positioned at an incident side of said liquid crystal display element;
• an exit side polarizing element being positioned at an exit side of said liquid crystal display element;
• a holding member for holding at least the liquid crystal display element, the exit side polarizing element and said first optical element in each of said liquid crystal display portions;
• and
• a cooling medium for cooling, wherein either said incident side polarizing element or said liquid crystal display element, said first optical element and said holding member define a space between said liquid crystal display element and said first optical element, and said cooling medium is filled up within said space.

A liquid crystal display apparatus, comprising:

• an optical source system for emitting projection light;
• a plurality of liquid crystal display portions, for receiving the emission light from said optical source of the optical system and for generating a projection picture depending upon a driver signal;
• a projection optical system for composing and for projecting the light emitted from said plurality of liquid crystal display portions towards an projection object, wherein:
• said optical source system has a light source and a separation optical system for dividing and exiting a light emitted from the light source toward said plurality of liquid crystal display portions;
• and
• said projection optical system has a first optical element for composing lights emitted from said plurality of liquid crystal display portions and a second optical element for projecting the light composed, and further, each of said liquid crystal display portions comprises:
• a liquid crystal display element for generating the picture;
• an incident side polarizing element being positioned at an incident side of said liquid crystal display element;
• an exit side polarizing element being positioned at an exit side of said liquid crystal display element;
• a holding member for holding at least the liquid crystal display element, the exit side polarizing element and said second optical element;
• and
• a cooling medium for cooling, wherein said holding member is provided in common for said liquid crystal display portions, as well as, in each of said liquid crystal display portions, either one of said incident side polarizing element or said liquid crystal display element, said second optical element and said holding member define a space between said liquid crystal display element and said second optical element, the space within which said cooling medium is filled up is constructed as one space as a whole, for the liquid crystal display portions, and said cooling medium is filled up within said space.

An optical device, including a liquid crystal display element within an optical path, comprising:

• an incident side polarizing element positioned at an incident side of said liquid crystal display element;
• an exit side polarizing element positioned at an exit side of said liquid crystal display element;
• fixing means for fixing said incident side polarizing element, said liquid crystal display element and said exit side polarizing element;
• cooling medium;
• and
• holding means for holding said cooling medium under a condition of contacting with said exit side polarizing element.