Glassless three-dimensional display apparatus including single backlight unit

Patent metadata

Field	Value
Publication number	US-10429573-B2
Application number	US-201715404553-A
Country	US
Kind code	B2
Filing date	Jan 12, 2017
Priority date	Aug 31, 2016
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

A double-sided glassless three-dimensional (3D) display apparatus including a backlight unit may include an light source unit configured to emit light to the front and the rear thereof by diffracting incident light, and first and second display devices configured to use the light emitted by the light source unit as light for a 3D image formation and to form the 3D image on both sides of the light source unit. The light source unit may include a light source portion configured to emit three lights that have three different respective wavelengths and a light guide panel configured to transmit the lights emitted by the light source portion to the first and second display devices.

First claim

What is claimed is:

1. A double-sided glassless three-dimensional (3D) display apparatus, the apparatus comprising:
a light source configured to emit light in each of a first direction to exit through a first side of the light source and a second direction to exit through a second side of the light source which is different from the first side of the light source by diffracting incident light;
a first display device configured to use the light emitted in the first direction for formation of a 3D image; and
a second display device configured to use the light emitted in the second direction for formation of the 3D image.

2. The apparatus of claim 1 , wherein the first display device is disposed in a front of the light source.

3. The apparatus of claim 1 , wherein the light source comprises a grating.

4. The apparatus of claim 1 , wherein the light source comprises a backlight device comprising a diffraction portion.

5. The apparatus of claim 1 , wherein the light source comprises a light guide panel (LGP).

6. The apparatus of claim 1 , wherein the light source comprises:
a light source portion configured to emit a first light that has a first wavelength, a second light that has a second wavelength that is different from the first wavelength, and a third light that has a third wavelength that is different from the first wavelength and the second wavelength; and
a light guide panel (LGP) configured to facilitate a propagation of light emitted from the light source portion to the first and second display devices.

7. The apparatus of claim 1 , wherein the first display device is a same type of device as the second display device.

8. The apparatus of claim 1 , wherein the first display device is a different type of device from the second display device.

9. The apparatus of claim 1 , wherein each of the first display device and the second display device comprises one from among a liquid crystal display (LCD) apparatus and an organic light-emitting diode (OLED) apparatus.

10. The apparatus of claim 1 , wherein the second display device is disposed in a rear of the light source.

11. The apparatus of claim 6 , further comprising a light transmission medium disposed between the light source portion and the LGP.

12. The apparatus of claim 6 , wherein the light source portion comprises:
a first light source portion configured to emit red color light;
a second light source portion configured to emit green color light; and
a third light source portion configured to emit blue color light.

13. The apparatus of claim 6 , wherein the light source portion is disposed on at least one side surface of the LGP.

14. The apparatus of claim 6 , wherein the LGP comprises a diffraction portion which includes a plurality of unit diffraction areas, the plurality of unit diffraction areas correspond to a first plurality of pixels included in a pixel area of the first display device, and the plurality of unit diffraction areas correspond to a second plurality of pixels included in a pixel area of the second display device.

15. The apparatus of claim 14 , wherein each of the plurality of unit diffraction areas comprises:
a first sub-diffraction area;
a second sub-diffraction area; and
a third sub-diffraction area,
wherein each of the first, second, and third sub-diffraction areas comprises grating slits arranged in directions which are different from each other.

16. A three-dimensional (3D) display apparatus, comprising:
a light source configured to emit light;
a light guide panel configured to receive the emitted light and to diffract the received light such that a first portion of the diffracted light propagates in a first direction to exit through a first side of the light guide panel and a second portion of the diffracted light propagates in a second direction to exit through a second side of the light guide panel which is different from the first side of the light guide panel;
a first display device configured to use the first portion of the diffracted light for formation of a 3D image; and
a second display device configured to use the second portion of the diffracted light for formation of the 3D image.

17. The apparatus of claim 16 , wherein the first display device is disposed on the first side of the light guide panel and the second display device is disposed on the second side of the light guide panel which is opposite the first side.

18. The apparatus of claim 16 , wherein the light guide panel comprises at least one grating.

19. The apparatus of claim 16 , wherein the light source comprises a red light source configured to emit a first light that has a first wavelength, a green light source configured to emit a second light that has a second wavelength that is different from the first wavelength, and a blue light source configured to emit a third light that has a third wavelength that is different from the first wavelength and the second wavelength.

20. The apparatus of claim 16 , wherein each of the first display device and the second display device comprises one from among a liquid crystal display (LCD) apparatus and an organic light-emitting diode (OLED) apparatus.

21. The apparatus of claim 1 , wherein the light source comprises a diffraction grating configured to diffract the light emitted from the light source to simultaneously emit a first light towards the first display device and a second light towards the second display device.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Park Joonyong
• Shin Bongsu
• Kim Dongouk
• Kim Hyunjoon
• Bae Jihyun
• Shim Dongsik
• Lee Sunghoon
• Chung Jaeseung
• Song Seokho

Classifications

• G02B6/0038

  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

• G02B6/0068 Primary

  Arrangements of plural sources, e.g. multi-colour light sources · CPC title

• G02B6/0063 Primary

  for extracting light out both the major surfaces of the light guide · CPC title

• H04N13/31

  using parallax barriers · CPC title

• H04N13/324

  Colour aspects · CPC title