BACKLIGHT UNIT AND DISPLAY APPARATUS INCLUDING THE SAME

• US 20160202594A1
• Filed: 01/12/2016
• Published: 07/14/2016
• Est. Priority Date: 01/13/2015
• Status: Abandoned Application

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: KIM, Hee Seung, LEE, Sun Goo, LEE, Sei Hyoung, JUNG, Soo Yong
• Application Number:
  US14/993,739
• Publication Number:
  US 20160202594A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02B 30/24 involving temporal multiplexing, e.g. using sequentially activated left and right shutters
• CPC Class Codes: G02B 6/0023 provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
• CPC Class Codes: G02B 6/0036 2-D arrangement of prisms, protrusions, indentations or roughened surfaces
• CPC Class Codes: G02B 6/0038 Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
• CPC Class Codes: H04N 13/354 for displaying sequentially

Abstract

Provided is a display apparatus. The display apparatus includes a backlight unit configured to successively output backlight at multi output angles and a display module configured to successively output a 3D image corresponding to the backlight in multi output directions respectively corresponding to the multi output angles.

Claims

1. A backlight unit for outputting backlight used to reproduce a three-dimensional (3D) image, the backlight unit comprising:

a light source module configured to output collimated light whose an incident angle is adjusted; and

an optical waveguide including a side surface receiving the collimated light and a top outputting backlight corresponding to the collimated light, wherein the optical waveguide outputs, through a whole portion of the top, the backlight whose an output angle is adjusted according to the incident angle.

2. The backlight unit of claim 1, wherein the light source module comprises:

a light source unit configured to generate single source light;

an optical switch configured to separate the single source light into left-eye single source light and right-eye single source light;

a collimated light generator configured to divide each of the left-eye single source light and the right-eye single source light into N (where N is a natural number equal to or more than two) number of source lights to generate the collimated light that includes left-eye collimated light corresponding to the left-eye single source light and right-eye collimated light corresponding to the right-eye single source light; and

a driver configured to rotate the collimated light generator to adjust an incident angle of the collimated light.

3. The backlight unit of claim 2, wherein the collimated light generator comprises a 1×

N planar lightwave circuit (PLC) splitter configured to divide each of the left-eye single source light and the right-eye single source light into N (where N is a natural number equal to or more than two) number of source lights to simultaneously output the N source lights.

4. The backlight unit of claim 2, wherein the collimated light generator alternately irradiates the left-eye collimated light and the right-eye collimated light onto a side surface of the optical waveguide according to a time division method.

5. The backlight unit of claim 4, wherein the collimated light generator alternately irradiates the left-eye collimated light and the right-eye collimated light onto the side surface of the optical waveguide according to the time division method.

6. The backlight unit of claim 1, wherein

the optical waveguide comprises a plurality of projection patterns continuously arranged on the top at certain intervals to have a certain length, and

incident light which is incident through the side surface is diffracted by the plurality of projection patterns, and the backlight is thereby output through the whole portion of the top.

7. A display apparatus for reproducing a three-dimensional (3D) image, the display apparatus comprising:

a backlight unit configured to successively output backlight at multi output angles; and

a display module configured to successively output a 3D image corresponding to the backlight in multi output directions respectively corresponding to the multi output angles.

8. The display apparatus of claim 7, wherein the backlight unit changes an output angle of the backlight according to an output timing of the 3D image output by the display module.

9. The display apparatus of claim 8, wherein the backlight unit receives a synchronization signal, which controls the output timing of the 3D image, from the display module and changes the output angle of the backlight in response to the synchronization signal.

10. The display apparatus of claim 7, wherein the display module comprises:

a timing controller configured to generate a synchronization signal for controlling the output timing of the 3D image;

a panel driver configured to a driving signal according to the synchronization signal; and

a display panel configured to successively output the 3D image corresponding to the backlight in multi output directions respectively corresponding to the multi output angles according to the driving signal.

11. The display apparatus of claim 10, wherein the backlight unit comprises:

a light source module configured to output collimated light which is sequentially changed at multi incident angles according to a timing synchronized with the synchronization signal; and

an optical waveguide including a side surface receiving the collimated light and a top outputting backlight corresponding to the collimated light, wherein the optical waveguide outputs, through a whole portion of the top, the backlight at multi output angles respectively corresponding to the multi incident angles.

12. The display apparatus of claim 11, wherein the light source module comprises:

a light source unit configured to generate single source light;

an optical switch configured to separate the single source light into left-eye single source light and right-eye single source light;

a collimated light generator configured to divide each of the left-eye single source light and the right-eye single source light into N (where N is a natural number equal to or more than two) number of source lights to generate the collimated light that includes left-eye collimated light corresponding to the left-eye single source light and right-eye collimated light corresponding to the right-eye single source light; and

a driver configured to rotate the collimated light generator to adjust an incident angle of the collimated light at the timing synchronized with the synchronization signal.

13. The display apparatus of claim 11, wherein

the optical waveguide comprises a plurality of projection patterns continuously arranged on the top at certain intervals to have a certain length, and

incident light which is incident through the side surface is diffracted by the plurality of projection patterns, and the backlight is thereby output through the whole portion of the top.