Projection type image display apparatus

A projection type image display apparatus, comprising;

• a light source which emits light;
• an integrator optical system which includes two array lenses, a polarization conversion element and a superimposing lens;
• a light valve which receives light passed through said integrator optical system;
• a projection lens which projects the light passed through said light valve;
• and
• a light-masking unit arranged between said light source and said projection lens,
• wherein:
• one of said two array lenses has a plurality of lens cells arranged in a first direction and a second direction, including:
• 1) at least one center lens cell contacting an optical axis of the light emitted from said light source,
• 2) at least one first adjacent lens cell adjacent to said at least one center lens cell in said first direction away from said optical axis, and
• 3) at least one second adjacent lens cell adjacent to said at least one center lens cell in said second direction away from said optical axis, and
• in one light-masking condition, said light-masking unit masks light so that said at least one center lens cell and said at least one first adjacent lens cell are partially light-masked and said at least one second adjacent lens cell is entirely light-masked.

A projection type image display apparatus, comprising:

• a light source which emits light;
• two array lenses which have a plurality of lens cells arranged in a first direction and a second direction;
• a light valve which receives light passed through said two array lenses;
• a projection lens which projects the light passed through said light valve;
• and
• a light-masking unit arranged between said light source and said projection lens,
• wherein:
• one of said two array lenses has:
• 1) at least one center lens cell positioned at the center of said plurality of lens cells,
• 2) at least one first adjacent lens cell adjacent to said at least one center lens cell in said first direction away from the center of said plurality of lens cells, and
• 3) at least one second adjacent lens cell adjacent to said at least one center lens cell in said second direction away from the center of said plurality of lens cells,
• in one light-masking condition, said light-masking unit masks light so that said at least one center lens cell and said at least one first adjacent lens cell are partially light-masked and said at least one second adjacent lens cell is entirely light-masked.