Back to results
US 10,257,480 B2Granted
Projection display apparatus and projection method for projection display apparatus
AssigneeNEC Display Solutions, Ltd.
InventorShinichiro Chikahisa
Life of this patent
Estimating the term…
Abstract
A projection display apparatus that can prevent deviation in the light quantity distribution of the projected image is provided. A projection display apparatus includes: a light source unit including a light emitting element; an image light generator modulating light from the light source unit to emit image light; a projecting unit projecting the image light; a polarization modulator on which the image light is made incident and that emits light in a particular polarization state; and a depolarizer arranged on the optical path between the light emitting element and the polarization modulator.
Claims14
A projection display apparatus, comprising:
- a light source unit including a plurality of light emitting elements;
- an image light generator that modulates light from the light source unit to emit image light;
- a projecting unit that projects the image light;
- a polarization modulator on which the image light is made incident and that emits light in a particular polarization state;
- a depolarizer
- which is composed of two wedge-shaped quartz plates that have optical anisotropy, the two wedge-shaped quartz plates being arranged such that their optical axes are oriented at an angle of 45 degrees to each other;
- and
- an illuminating unit,
- wherein the illuminating unit includes:
- an illuminance uniformizing unit that makes an illuminance of light from the light source unit uniform, an exit surface of the illuminance uniformizing unit being conjugate to a surface of the image light generator on which an image is formed;
- a prism unit that makes light that exited from the illuminance uniformizing unit incident on the image light generator and that makes the image light emitted from the image light generator incident on the projecting unit;
- and
- a lens that is arranged on an optical path between the illuminance uniformizing unit and the prism unit;
- and
- wherein the depolarizer is arranged on an optical path between the lens and the prism unit.
12 more elements
A projection display apparatus, comprising:
- a light source unit including a light emitting element;
- an image light generator that modulates light from the light source unit to emit image light;
- a projecting unit that projects the image light;
- a polarization modulator on which the image light is made incident and that emits light in a particular polarization state;
- a depolarizer,
- wherein the illuminating unit includes:
- an illuminance uniformizing unit that makes an illuminance of the light from the light source unit uniform, an exit surface of the illuminance uniformizing unit being conjugate to a surface of the image light generator on which an image is formed;
- a prism unit that makes light that exited from the illuminance uniformizing unit incident on the image light generator and that makes the image light emitted from the image light generator incident on the projecting unit;
- and
- a lens that is arranged on an optical path between the illuminance uniformizing unit and the prism unit, and
- wherein the depolarizer is arranged on an optical path between the lens and the prism unit.
8 more elements
A projection display method for a projection display apparatus, the projection display method comprising:
- eliminating, by a depolarizer, polarization of image light generated by light from a light source unit that includes a plurality of light emitting elements;
- emitting the image light with respect to which polarization was eliminated as light in a particular polarized state,
- wherein the depolarizer is composed of two wedge-shaped quartz plates that have optical anisotropy, the two wedge-shaped quartz plates being arranged such that their optical axes are oriented at an angle of 45 degrees to each other;
- and
- passing the light from the light source unit through an illuminating unit,
- wherein the illuminating unit includes:
- an illuminance uniformizing unit that makes an illuminance of light from the light source unit uniform, an exit surface of the illuminance uniformizing unit being conjugate to a surface of an image light generator on which an image is formed;
- a prism unit that makes light that exited from the illuminance uniformizing unit incident on the image light generator and that makes the image light emitted from the image light generator incident on a projecting unit;
- and
- a lens that is arranged on an optical path between the illuminance uniformizing unit and the prism unit, and
- wherein the depolarizer is arranged on an optical path between the lens and the prism unit.
8 more elements
Dependencies are inferred from the claim text.