DISPLAY DEVICE USING SINGLE-PANEL DIFFRACTIVE LIGHT MODULATOR

Abstract

Disclosed herein is a display device using a single-panel diffractive light modulator. The display device includes a light source unit, a condensing unit, an illumination unit, a diffractive light modulator, a projection unit, a filter unit, and a distortion correcting means.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a diagram showing the construction of a prior art display device using a single-panel diffractive light modulator;

FIG. 2A is a view showing image distortion generated on the screen of FIG. 1, and FIG. 2B is a view showing an imaginary plane defined by the same projection distance when the screen of FIG. 1 is viewed from the front thereof;

FIG. 3 is a diagram showing the construction of a display device using a single-panel diffractive light modulator according to an embodiment of the present invention; and

FIG. 4 is a diagram showing the construction of a display device using a single-panel diffractive light modulator according to another embodiment of the present invention.

Claims

1. A display device using a single-panel diffractive light modulator, comprising: a light source unit comprising a plurality of light sources for respectively emitting beams of light having respective wavelengths;a condensing unit for causing the beams of light, emitted from the plurality of light sources, to have an identical light path;an illumination unit for converting the light, emitted from the light sources of the light source unit, into linear light;a diffractive light modulator for generating diffracted light having a plurality of diffraction orders by modulating the linear light when the linear light enters from the illumination unit, so that diffracted light having at least one diffraction order, which will be used in an application, has light intensity values suitable for the application at respective locations thereof;a projection unit for projecting the diffracted light having a plurality of diffraction orders, emitted from the diffractive light modulator, onto the screen and generating images;a filter unit for passing diffracted light having at least one desired diffraction order, which is selected from the diffracted light having a plurality of diffraction orders and is used in the application, therethrough; anddistortion correcting means for correcting image distortion that is caused upon projection of the diffracted light onto the screen by the projection unit.

2. The display device as set forth in claim 1, wherein the projection unit comprises: a projection lens for expanding the diffracted light having a plurality of diffraction orders, emitted from the diffractive light modulator; anda scanner for scanning the diffracted light, entering from the projection lens, across a screen.

3. The display device as set forth in claim 2, wherein the scanner is a Galvanometer mirror.

4. The display device as set forth in claim 2, wherein the scanner is a polygon mirror.

5. The display device as set forth in claim 1, wherein the filter unit is disposed between the projection unit and the screen, and passes diffracted light having at least one desired diffraction order, selected from the diffracted light having a plurality of diffraction orders projected by the projection unit, therethrough.

6. The display device as set forth in claim 1, wherein the filter unit is located downstream of the diffractive light modulator, and passes diffracted light having at least one desired diffraction order, selected from the diffracted light having a plurality of diffraction orders projected by the projection unit, therethrough.

7. The display device as set forth in claim 1, wherein the distortion correcting means is an f·θ scan lens that has a specific refractive index with respect to a θ optical axis and that focuses diffracted light on a projection surface by deflecting the diffracted light having equiangular velocity, reflected from the scanner, in a principal scanning direction and correcting aberration.

8. The display device as set forth in claim 1, wherein the distortion correcting means and the screen are integrated into a high-luminance screen.