Apparatus and method for displaying image

Abstract

An apparatus and method are provided for displaying an image by raster scanning using a mirror. The apparatus includes a mirror control unit that controls a vertical motion of the mirror to be a triangle wave motion, and a scanning unit that repeatedly performs a forward scan and a reverse scan over the mirror in an orthogonal direction. The apparatus can reduce ringing by controlling the vertical motion of the mirror to be an isosceles triangle wave motion and increasing a sawtooth flyback time to about 50%. Also, since the reverse scan is performed during flyback after the forward scan is performed, the apparatus can compensate for a reduction in screen brightness, which is caused by the increase of the sawtooth flyback time to about 50%.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which:

FIG. 1 is a perspective view for explaining the concept of a related art apparatus for displaying an image by raster scanning;

FIG. 2 is a perspective view of a two-dimensional scanner for raster scanning in the related art image displaying apparatus of FIG. 1;

FIG. 3A is a graph illustrating a horizontal motion of the related art two-dimensional scanner of FIG. 2;

FIG. 3B is a graph illustrating a vertical motion of the related art two-dimensional scanner of FIG. 2;

FIG. 4 is a view illustrating vertical ringing occurring in the related art image displaying apparatus of FIG. 1;

FIGS. 5A through 5C are graphs illustrating a relation between vertical ringing and a vertical natural frequency of the scanner of FIG. 2 in the related art image displaying apparatus of FIG. 1;

FIGS. 6A through 6C are graphs illustrating a relation between vertical ringing and a Q factor in the related art image displaying apparatus of FIG. 1;

FIGS. 7A through 7C are graphs illustrating a relation between vertical ringing and a sawtooth flyback time in the related art image displaying apparatus of FIG. 1;

FIG. 8 is a block diagram of an apparatus for displaying an image according to an exemplary embodiment of the present invention;

FIG. 9 is a flowchart illustrating a method of displaying an image according to an exemplary embodiment of the present invention; and

FIGS. 10 and 11 are graphs for explaining the image displaying apparatus and method of FIGS. 8 and 9 according to an exemplary embodiment of the present invention.

Claims

1. An apparatus for displaying an image by raster scanning using a mirror, the apparatus comprising: a mirror control unit which controls a vertical motion of the mirror to be a substantially triangular wave motion; anda scanning unit which repeatedly performs a forward scan and a reverse scan over the mirror in a substantially orthogonal direction.

2. The apparatus of claim 1, wherein the mirror control unit controls the vertical motion of the mirror to be a substantially isosceles triangle wave motion.

3. The apparatus of claim 1, wherein the scanning unit performs the forward scan in a first in first out (FIFO) order and the reverse scan in a last in first out (LIFO) order.

4. The apparatus of claim 1, wherein the scanning unit performs the reverse scan using a frame buffer.

5. The method of claim 1, where the mirror control unit comprises a computer-readable medium including a set of instructions for performing the displaying of the image.

6. A method of displaying an image by raster scanning using a mirror, the method comprising: controlling a vertical motion of the mirror to be a substantially triangle wave motion; andrepeatedly performing a forward scan and a reverse scan over the mirror in a substantially orthogonal direction.

7. The method of claim 6, wherein the controlling of the vertical motion of the mirror comprises controlling the vertical motion of the mirror to be a substantially isosceles triangle wave motion.

8. The method of claim 6, wherein the repeatedly performing of the forward scan and the reverse scan comprises performing the forward scan in a first in first out (FIFO) order and the reverse scan in a last in first out (LIFO) order.

9. The method of claim 6, wherein the repeatedly performing of the forward scan and the reverse scan comprises performing the forward scan using a frame buffer.

10. A computer-readable recording medium having embodied thereon a program for performing a method of displaying an image by raster scanning using a mirror, the method comprising: controlling a vertical motion of the mirror to be a substantially triangle wave motion; andrepeatedly performing a forward scan and a reverse scan over the mirror in a substantially orthogonal direction.

11. The computer-readable recording medium of claim 10, wherein the controlling of the vertical motion of the mirror comprises controlling the vertical motion of the mirror to be a substantially isosceles triangle wave motion.

12. The computer-readable recording medium of claim 10, wherein the repeatedly performing of the forward scan and the reverse scan comprises performing the forward scan in a first in first out (FIFO) order and the reverse scan in a last in first out (LIFO) order.

13. The computer-readable recording medium of claim 10, wherein the repeatedly performing of the forward scan and the reverse scan comprises performing the forward scan using a frame buffer.