Light concentrating backlight and near-eye display system using same
US-2018246330-A1 · Aug 30, 2018 · US
Directional backlight unit and image display apparatus including the same
US10393945B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10393945-B2 |
| Application number | US-201815860202-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 2, 2018 |
| Priority date | Jan 2, 2017 |
| Publication date | Aug 27, 2019 |
| Grant date | Aug 27, 2019 |
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- Title
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- Abstract
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Abstract
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Provided are a directional backlight unit and an image display apparatus including the same. The directional backlight unit includes at least one light source, a light guide plate arranged at a side of the at least one light source and configured to guide light emitted from the at least one light source by total reflection, a plurality of diffraction gratings arranged in a pattern at a surface of the light guide plate and configured to diffract the light and to emit the light diffracted by the plurality of diffraction gratings at a predetermined angle from a front surface; and a mirror arranged at a rear surface of the light guide plate and configured to reflect the light diffracted by the plurality of diffraction gratings toward the light guide plate, the rear surface of the light guide plate being opposite to the front surface of the light guide plate.
First claim
Opening claim text (preview).
What is claimed is: 1. A directional backlight unit comprising: at least one light source; a light guide plate arranged at a side of the at least one light source, and configured to guide light emitted from the at least one light source by total reflection; a plurality of diffraction gratings arranged in a pattern at a surface of the light guide plate and configured to diffract the light emitted from the at least one light source and to emit the light diffracted by the plurality of diffraction gratings at a predetermined angle from a front surface of the light guide plate; and a mirror arranged at a rear surface of the light guide plate and configured to reflect the light diffracted by the plurality of diffraction gratings toward the light guide plate, the rear surface of the light guide plate being opposite to the front surface of the light guide plate, wherein the at least one light source comprises at least one of a red light source, a green light source, and a blue light source, wherein the mirror comprises at least one of a red dichroic mirror configured to reflect only red light, a green dichroic mirror configured to reflect only green light, and a blue dichroic mirror configured to reflect only blue light, and wherein the at least one of the red dichroic mirror, the green dichroic mirror and the blue dichroic mirror is arranged over a portion of the rear surface of the light guide plate. 2. The directional backlight unit of claim 1 , wherein the plurality of diffraction gratings are arranged at the front surface of the light guide plate. 3. The directional backlight unit of claim 1 , wherein the plurality of diffraction gratings are arranged at the rear surface of the light guide plate. 4. The directional backlight unit of claim 1 , wherein the mirror is arranged over a total area of the rear surface of the light guide plate. 5. The directional backlight unit of claim 1 , wherein the mirror is arranged over a portion of the rear surface of the light guide plate. 6. The directional backlight unit of claim 1 , wherein the red dichroic mirror is arranged at a side of the rear surface of the light guide plate opposite to the red light source, the green dichroic mirror is arranged at a side of the rear surface of the light guide plate opposite to the green light source, and the blue dichroic mirror is arranged at a side of the rear surface of the light guide plate opposite to the blue light source. 7. An image display apparatus comprising: at least one light source; a light guide plate arranged at a side of the at least one light source, and configured to guide light emitted from the at least one light source by total reflection; a plurality of diffraction gratings arranged in a pattern at a surface of the light guide plate and configured to diffract the light emitted from the at least one light source and to emit the light diffracted by the plurality of diffraction gratings at a predetermined angle from a front surface of the light guide plate; a mirror arranged at a rear surface of the light guide plate and configured to reflect the light diffracted by the plurality of diffraction gratings toward the light guide plate, the rear surface of the light guide plate being opposite to the front surface of the light guide plate; and a display panel arranged on the front surface of the light guide plate, wherein the at least one light source comprises at least one of a red light source, a green light source, and a blue light source, wherein the mirror comprises at least one of a red dichroic mirror configured to reflect only red light, a green dichroic mirror configured to reflect only green light, and a blue dichroic mirror configured to reflect only blue light, and wherein the at least one of the red dichroic mirror, the green dichroic mirror and the blue dichroic mirror is arranged over a portion of the rear surface of the light guide plate. 8. The image display apparatus of claim 7 , wherein the plurality of diffraction gratings are arranged at the front surface of the light guide plate. 9. The image display apparatus of claim 7 , wherein the plurality of diffraction gratings are arranged at the rear surface of the light guide plate. 10. The image display apparatus of claim 7 , wherein the mirror is arranged over a total area of the rear surface of the light guide plate. 11. The image display apparatus of claim 7 , wherein the mirror is arranged over a portion of the rear surface of the light guide plate. 12. The image display apparatus of claim 7 , wherein the red dichroic mirror is arranged at a side of the rear surface of the light guide plate opposite to the red light source, the green dichroic mirror is arranged at a side of the rear surface of the light guide plate opposite to the green light source, and the blue dichroic mirror is arranged at a side of the rear surface of the light guide plate opposite to the blue light source.
Assignees
Inventors
Classifications
- G02B6/0061Primary
to provide homogeneous light output intensity · CPC title
Arrangements of plural sources, e.g. multi-colour light sources · CPC title
Reflecting element, sheet or layer · CPC title
- G02B6/0038Primary
Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide · CPC title
the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light · CPC title
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- What does patent US10393945B2 cover?
- Provided are a directional backlight unit and an image display apparatus including the same. The directional backlight unit includes at least one light source, a light guide plate arranged at a side of the at least one light source and configured to guide light emitted from the at least one light source by total reflection, a plurality of diffraction gratings arranged in a pattern at a surface …
- Who is the assignee on this patent?
- Samsung Electronics Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification G02B6/0061. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Aug 27 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).