Hologram display apparatus and method for controlling the same

1. A hologram display apparatus comprising:

a detector configured to detect a position of a viewer;

a spatial light modulation panel configured to modulate a light to display a hologram;

an optical path switching unit configured to refract the light from the spatial light modulation panel based upon a grade determined by the detected position of the viewer; and

a laser source configured to adjust an intensity of light output from the laser source on a basis of the grade determined by the detected position of the viewer so as to generate the light with a compensated output,

wherein the grade includes a left eye-grade for a left eye of the viewer and a right eye-grade for a right eye of the viewer,

wherein the optical path switching unit refracts the light in accordance with each of the left eye-grade and the right eye-grade respectively.

2. The hologram display apparatus according to claim 1 , wherein the left eye-grade and the right eye-grade are different from each other.

3. The hologram display apparatus according to claim 2 , wherein a compensated output from the laser source on the basis of the left eye-grade and a compensated output from the laser source on the basis of the right eye-grade are different from each other.

4. The hologram display apparatus according to claim 1 , wherein the laser source is configured to determine the output from the laser source corresponding to the grade by using a look-up table.

5. The hologram display apparatus according to claim 1 , wherein the laser source is configured to further compensate the output as the grade increases.

6. The hologram display apparatus according to claim 1 , wherein the laser source compensates the output by adjusting a duty or a size.

7. The hologram display apparatus according to claim 1 , wherein the optical path switching unit includes:

a first substrate;

a second substrate facing the first substrate;

a driving electrode on the first substrate;

a common electrode on the second substrate; and

a liquid crystal unit interposed between the first substrate and the second substrate.

8. The hologram display apparatus according to claim 7 , wherein the liquid crystal unit is formed of liquid crystal molecules continuously arranged in the entire liquid crystal unit.

9. The hologram display apparatus according to claim 8 , wherein when a voltage is applied to the driving electrode and the common electrode and an electric field is generated, the liquid crystal molecules are arranged in multiple prism patterns according to the electric field.

10. The hologram display apparatus according to claim 1 , wherein an output luminance of the light refracted in accordance with the left eye-grade is substantially the same as that of the light refracted in accordance with the right eye-grade.

11. A method for controlling a hologram display apparatus, comprising:

detecting a position of a viewer;

determining a grade for a left eye of the viewer and a grade for a right eye of the viewer according to the position of the viewer;

driving a laser source to adjust an intensity of light output from the laser source on a basis of the grade for the left eye of the viewer and the grade for the right eye of the viewer determined according to the position of the viewer so as to generate a light with a compensated output; and

applying a voltage to an optical path switching unit so as to refract the light with each of the grade for the left eye of the viewer and the grade for the right eye of the viewer respectively.

12. The method for controlling a hologram display apparatus according to claim 11 , wherein the driving a laser source includes further compensating the output as the grade increases.

13. The method for controlling a hologram display apparatus according to claim 11 , wherein an output luminance of the light refracted in accordance with the left eye-grade is substantially the same as that of the light refracted in accordance with the right eye-grade.

14. A display apparatus comprising:

a detector detects a position of a viewer;

a left eye-grade for a left eye of the viewer and a right eye-grade for a right eye of the viewer determined by the position of the viewer;

a light source generates a light;

a light modulation panel modulates the light to display a hologram;

an optical path switching unit refracts the light from the light modulation panel; and

a controller supplies a driving voltage for driving the optical path switching unit in accordance with the left eye-grade and the right eye-grade respectively,

wherein the controller controls the light source to adjust an intensity of light output from the light source on a basis of the left eye-grade for the left eye of the viewer and the right eye-grade for the right eye of the viewer determined by the position of the viewer so as to generate a light with a compensated output.

15. The display apparatus according to claim 14 , wherein the left eye-grade and the right eye-grade are different from each other.

16. The display apparatus according to claim 14 , wherein the optical path switching unit includes:

a first substrate;

a second substrate facing the first substrate;

a driving electrode on the first substrate;

a common electrode on the second substrate; and

a liquid crystal unit interposed between the first substrate and the second substrate.

17. The display apparatus according to claim 14 , wherein the display apparatus including a hologram display.

18. The display apparatus according to claim 14 , wherein an output luminance of the light refracted in accordance with the left eye-grade is substantially the same as that of the light refracted in accordance with the right eye-grade.