Display device and operating method thereof

Patent metadata

Field	Value
Publication number	US-9733617-B2
Application number	US-201313961929-A
Country	US
Kind code	B2
Filing date	Aug 8, 2013
Priority date	Feb 5, 2013
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A display device according to embodiments of the present disclosure includes a determination unit to determine a display mode, a light generator to selectively irradiate a 2D light or a hologram 3D light, a spatial light modulator to selectively display a 2D image or a hologram 3D image, and a control unit that controls the light generator to selectively irradiate the 2D light or the hologram 3D light and controls the spatial light modulator to modulate the 2D light or the hologram 3D light irradiated from the light generator to display the 2D image or the hologram 3D image according to the display mode determined by the determination unit.

First claim

What is claimed is:

1. A display device comprising:
a light generator, wherein the light generator includes a light source hologram unit multi-recorded with a 2D light source hologram and a hologram 3D light source hologram, wherein the light source hologram unit is manufactured by developing a holographic medium, wherein the light generator includes a reference light unit to irradiate a first reference light and a second reference light, wherein the 2D light source hologram is recorded by simultaneously irradiating a 2D light and the first reference light onto the holographic medium and the hologram 3D light source hologram is recorded by simultaneously irradiating a hologram 3D light and the second reference light onto the holographic medium, wherein the 2D light and the hologram 3D light are irradiated onto a same area of the holographic medium;
a spatial light modulator that displays a 2D image or a hologram 3D image;
a determination unit that determines a display mode; and
a controller, wherein the controller controls the reference light unit to irradiate the first reference light onto the light source hologram unit such that the 2D light is generated from the light source hologram unit and controls the spatial light modulator to display the 2D image by using the generated 2D light when the display mode is a 2D mode, and wherein the controller controls the reference light unit to irradiate the second reference light onto the light source hologram unit such that the hologram 3D light is generated from the light source hologram unit and controls the spatial light modulator to display the hologram 3D image by using the generated hologram 3D light when the display mode is a hologram 3D mode,
wherein the first reference light is diffracted by the 2D light source hologram and modulated into the 2D light, when the display mode is the 2D mode,
wherein the second reference light is diffracted by the hologram 3D light source hologram and modulated into the hologram 3D light, when the display mode is the hologram 3D mode,
wherein the first reference light and the second reference light are irradiated onto a same area of the light source hologram unit,
wherein the generated 2D light is a diffused light and the generated hologram 3D light is a plane wave light or a spherical wave light, and
wherein the spatial light modulator displays the 2D image over the spatial light modulator by modulating the diffused light and displays the hologram 3D image in a space by modulating the plane wave light or a spherical wave light.

2. The display device of claim 1 , wherein the light source hologram unit includes a holographic optical element multi-recorded with the 2D light source hologram and the hologram 3D light source hologram.

3. The display device of claim 1 , wherein the light source hologram unit includes a spatial light modulator to display the 2D light source hologram or the hologram 3D light source hologram using a computer generated hologram scheme.

4. The display device of claim 1 , wherein the determination unit determines the display mode according to at least one of a user's input or a type of a received image signal.

5. A method of operating a display device including a light generator, the method comprising:
recording a 2D light source hologram by simultaneously irradiating a 2D light and a first reference light onto a holographic medium and recording a hologram 3D light source hologram by simultaneously irradiating a hologram 3D light and a second reference light onto the holographic medium, wherein the light generator includes the light source hologram unit multi-recorded with a 2D light source hologram and a hologram 3D light source hologram, wherein the light source hologram unit is manufactured by developing the holographic medium, wherein the 2D light and the hologram 3D light are irradiated onto a same area of the holographic medium, wherein the light generator includes a spatial light modulator;
determining a display mode;
irradiating the first reference light onto the light source hologram unit such that the 2D light is generated from the light source hologram unit when the display mode is a 2D mode, and irradiating the second reference light onto the light source hologram unit such that the hologram 3D light is generated from the light source hologram unit when the display mode is a hologram 3D mode; and
displaying a 2D image by using the generated 2D light in accordance with the 2D light being generated and displaying a hologram 3D image by using the hologram 3D in accordance with the hologram 3D light being,
wherein the first reference light is diffracted by the 2D light source hologram and modulated into the 2D light, when the display mode is the 2D mode,
wherein the second reference light is diffracted by the hologram 3D light source hologram and modulated into the hologram 3D light, when the display mode is the hologram 3D mode,
wherein the first reference light and the second reference light are irradiated onto a same area of the light source hologram unit,
wherein the generated 2D light is a diffused light and the generated hologram 3D light is a plane wave light or a spherical wave light, and
wherein the spatial light modulator displays the 2D image over the spatial light modulator by modulating the diffused light and displays the hologram 3D image in a space by modulating the plane wave light or a spherical wave light.

6. The method of claim 5 , wherein the display mode is determined according to at least one of a user's input or a type of a received image signal.

7. The method of claim 5 , wherein the light source hologram unit includes a holographic optical element multi-recorded with the 2D light source hologram and the hologram 3D light source hologram.

8. The method of claim 7 , further including:
irradiating the first reference light to the holographic optical element when the display mode is a 2D mode, and irradiating the second reference light to the holographic optical element when the display mode is the hologram 3D mode, wherein the first reference light and the second reference light are irradiated onto a same area of the holographic optical element.

9. The method of claim 8 , wherein the spatial light modulator displays the 2D light source hologram or the hologram 3D light source hologram using a computer generated hologram scheme, wherein the irradiating the first reference light when the display mode is a 2D mode includes irradiating the first reference light to the spatial light modulator, and wherein irradiating the second reference light when the display mode is the hologram 3D mode includes irradiating the second reference light to the spatial light modulator.

Assignees

• Lg Electronics Inc

Inventors

• Park Woojae
• Kwon Dowoo
• Moon Wonseok

Classifications

• G03H1/265

  Angle multiplexing; Multichannel holograms (G03H1/268 takes precedence) · CPC title

• G03H1/2286 Primary

  Particular reconstruction light (G03H1/24 takes precedence); Beam properties · CPC title

• G03H2001/0439

  for recording Holographic Optical Element [HOE] · CPC title

• G03H1/28

  superimposed holograms only · CPC title

• G03H1/2294

  Addressing the hologram to an active spatial light modulator · CPC title