Wire grid polarization element and projection type display apparatus

A projection type display apparatus which is provided with a wire grid polarization element, the apparatus comprising:

• a liquid crystal panel;
• a light source unit that emits light to be supplied to the liquid crystal panel;
• and
• a projection optical system that projects light modulated by the liquid crystal panel,
• wherein the wire grid polarization element is disposed on an optical path from the light source unit to the projection optical system via the liquid crystal panel, and
• wherein the wire grid polarization element comprises:
• a first light transmitting substrate which is a single element made of a uniform and continuous material;
• a metallic wire grid formed on a first surface of the first light transmitting substrate, the metallic wire grid including a plurality of metal wires arranged in parallel with a space in-between along a first direction;
• and
• a second light transmitting substrate facing the first surface of the first light transmitting substrate,
• wherein at least one of the first surface of the first light transmitting substrate and a surface of the second light transmitting substrate facing the first light transmitting substrate includes an inclined surface at both ends in the first direction to define a recessed portion in a middle region, the metallic wire grid being formed on the recessed portion in the middle region without being formed on the inclined surface at both ends in the first direction, and
• wherein the first light transmitting substrate and the second light transmitting substrate are bonded to each other on an outer side of the recessed portion so as to seal the recessed portion such that a hollow space is formed between the metallic wire grid and the second light transmitting substrate.

A wire grid polarization element comprising:

• a first light transmitting substrate that includes an upper surface, a bottom surface, and an inclined surface that is positioned between the upper surface and the bottom surface;
• a metallic wire grid that is formed on the bottom surface of the first light transmitting substrate, the metallic wire grid including a plurality of metal wires arranged in parallel with a space in-between along a first direction, the metallic wire grid being formed on the bottom surface without being formed on the inclined surface that is disposed at both ends of the bottom surface along the first direction;
• and
• a second light transmitting substrate that is bonded to the upper surface of the first light transmitting substrate without a spacer, such that a hollow space is formed between the metallic wire grid and at least one of the first light transmitting substrate and the second light transmitting substrate.