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US 12,754,420 B2Granted
Light source unit and image display device
AssigneeNichia Corporation
InventorsWataru Kitahara, Takanori Aruga, Hajime Akimoto
Life of this patent
Estimating the term…
Abstract
A light source unit includes: a display device configured to emit light having a substantially Lambertian light distribution and to display an image; and an imaging optical system including: an input element on which light emitted from the display device is incident, and an output element on which light traveling via the input element is incident, the output element being configured to emit light forming a first image corresponding to the image. The imaging optical system is substantially telecentric at the first image side.
Claims18
A light source unit comprising:
- a display device configured to emit light having a substantially Lambertian light distribution and to display an image;
- and
- an imaging optical system comprising:
- a light bending part comprising an input element on which light emitted from the display device is incident, and
- an output element on which light traveling via the input element is incident, the output element being configured to emit light forming a first image corresponding to the image, wherein:
- the imaging optical system is substantially telecentric at a first image side,
- the light bending part is configured to bend a plurality of chief rays of the light, which are emitted from mutually different positions of the display device, cross each other before being incident on the input element, and reach the first image,
- the light bending part is configured to bend the plurality of chief rays to be substantially parallel before and after the first image, and
- the plurality of chief rays converge at a single point between the display device and the input element.
6 more elements
An image display device, comprising:
- a light source unit comprising:
- a display device configured to emit light having a substantially Lambertian light distribution and to display an image, and
- an imaging optical system comprising:
- an input element on which light emitted from the display device is incident, and
- an output element on which light traveling via the input element is incident, the output element being configured to emit light forming a first image corresponding to the image, wherein:
- the imaging optical system is substantially telecentric at the first image side;
- and
- a reflection unit separated from the light source unit, the reflection unit being configured to reflect light emitted from the imaging optical system such that the first image is formed between the light source unit and the reflection unit.
5 more elements
A light source unit comprising:
- a display device configured to emit light having a substantially Lambertian light distribution and to display an image;
- a mirror configured to reflect light emitted from the display device and to form a first image corresponding to the image;
- a reflective polarizing element located between the display device and the mirror;
- and
- a first waveplate located between the reflective polarizing element and the mirror;
- and
- a second waveplate, wherein:
- the reflective polarizing element is configured to transmit a first polarized light of the light emitted from the display device,
- the first waveplate is configured to convert the first polarized light transmitted by the reflective polarizing element into a circularly polarized light,
- the mirror is configured to reflect, toward the first waveplate, the circularly polarized light emitted from the first waveplate,
- the first waveplate is configured to convert, into a second polarized light, the circularly polarized light reflected by the mirror,
- the reflective polarizing element is configured to reflect, toward a formation position of the first image, the second polarized light emitted from the first waveplate,
- the mirror is substantially telecentric at the first image side, and
- the second waveplate is configured to convert, into the first polarized light, the second polarized light reflected by the reflective polarizing element.
11 more elements
Dependencies are inferred from the claim text.