Laser display device

Abstract

A laser display device is provided which includes: a light source emitting at least one laser beam; a light modulation unit for modulating the laser beam emitted from the light source according to an image signal; a scanning unit scanning the laser beam modulated in the light modulation unit in a main scanning direction and in a sub-scanning direction; and an image unit in which an image is formed having a phosphor layer in which excitation light is generated by a laser beam scanned by the scanning unit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features and advantages of the present invention will be illustrated in detailed exemplary embodiments thereof with reference to the attached drawings in which:

FIG. 1 illustrates the optical arrangement of a laser display device according to an embodiment of the present invention;

FIG. 2 illustrates a scanning unit of FIG. 1 according to an embodiment of the present invention;

FIG. 3A is a cross-sectional view of part of an image unit of FIG. 1;

FIG. 3B illustrates phosphors formed in a phosphor layer in FIG. 3A;

FIG. 4A illustrates the optical arrangement of a laser display device according to another embodiment of the present invention;

FIG. 4B is a view taken from a rear surface of the image unit of FIG. 4A;

FIG. 5A illustrates the optical arrangement of a laser display device according to another embodiment of the present invention; and

FIG. 5B is a view taken from a rear surface of the image unit of FIG. 5A.

Claims

1. A laser display device comprising: a light source emitting at least one laser beam;a light modulation unit for modulating the laser beam emitted from the light source according to an image signal;a scanning unit scanning the laser beam modulated in the light modulation unit in a main scanning direction and in a sub-scanning direction; andan image unit in which an image is formed having a phosphor layer in which excitation light is generated by a laser beam scanned by the scanning unit.

2. The laser display device of claim 1, wherein the light source is a laser diode emitting UV light.

3. The laser display device of claim 1, further comprising a collimating optical system located between the light source and the light modulation unit and collimating the laser beam emitted from the light source.

4. The laser display device of claim 1, further comprising a focusing optical system focusing the laser beam modulated in the modulation unit onto the image unit.

5. The laser display device of claim 1, wherein the scanning unit comprises at least a micro-scanner having a rotatable mirror.

6. The laser display device of claim 1, wherein the image unit further comprises a UV transmitting filter that is located at a surface of incidence of the laser beam onto the phosphor layer and transmits the UV wavelength band of the laser beam.

7. The laser display device of claim 1, wherein the image unit further comprises a UV blocking filter that is located on the opposite surface of the surface of the incidence of the laser beam of the phosphor layer.

8. The laser display device of claim 1, wherein the image unit further comprises an anti-reflection layer located on the opposite surface of the surface of the incidence of the laser beam of the phosphor layer.

9. The laser display device of claim 1, wherein the phosphor layer comprises a plurality of pixels formed of red, green, and blue phosphors.

10. The laser display device of claim 9, wherein the light source emits first through third laser beams which are separated so as to respectively excite the red, green, and blue phosphors at the same time.

11. The laser display device of claim 10, further comprising a light path converter converting the light path such that the first through third laser beams which are modulated in the light modulation unit are radiated to the scanning unit.

12. The laser display device of 11, wherein the light path converter comprises a first dichroic mirror that transmits the first laser beam and reflects the second laser beam, and a second dichroic mirror that reflects the first and second laser beams and transmits the third laser beam.

13. The laser display device of claim 9, further comprising a shadow mask that is separated a predetermined distance from the phosphor layer and in which are formed a plurality of holes corresponding to the pixels formed in the phosphor layer.

14. The laser display device of claim 1, wherein the scanning unit comprises: a first scanning unit scanning the laser beam modulated in the light modulator in a main scanning direction and in a sub-scanning direction for the first time; anda second scanning unit that is separated a predetermined distance from the rear surface of the image unit and scans the laser beam scanned in the first scanning unit onto the image unit in a main scanning direction and in a sub-scanning direction for the second time.

15. The laser display device of claim 14, wherein the image unit has M×N divided regions, and the second scanning unit comprises N×M sub-scanners that are separated a predetermined distance from the rear surface of the image unit and arranged closely in an M×N matrix and scan the laser beam scanned by the first scanning unit onto the image unit in a main scanning direction and in a sub-scanning direction for the second time.

16. The laser display device of claim 1, wherein the image unit has M×N divided regions and the scanning unit comprises M×N sub-scanning units that are arranged at a rear surface of the image unit according to the divided regions and scan the laser beam onto the image unit in a main scanning direction and in a sub-scanning direction, and each sub-scanning unit scans a laser beam which is individually modulated.