Cursor control apparatus and cursor control method thereof

1. A cursor control apparatus, adapted to control a cursor to move back and forth between a benchmark display unit and an extended display unit, wherein the benchmark display unit has a first display region, and the extended display unit has a second display region, wherein the first display region and the second display region are adjacent to each other in a first axial direction, the cursor control apparatus comprising:

a cursor control unit for generating a displacement value when moved; and

a processing unit coupled to the benchmark display unit, the extended display unit, and the cursor control unit, wherein the cursor control unit sends the displacement value to the processing unit, wherein the processing unit calculates a first DPI (dots per inch) ratio of the benchmark display unit to the extended display unit and a second DPI (dots per inch) ratio of the extended display unit to the benchmark display unit, and determines coordinates of a current position of the cursor, controls the cursor to move in the first axial direction according to the position coordinates and the displacement value, wherein when the cursor moves from the first display region to the second display region, the processing unit adjusts a position of the cursor in a second axial direction according to the first DPI ratio, and when the cursor moves from the second display region to the first display region, the processing unit adjusts a position of the cursor in the second axial direction according to the second DPI ratio, such that the cursor moves back and forth between the first display region and the second display region substantially linearly, wherein the first axial direction is perpendicular to the second axial direction.

2. The cursor control apparatus of claim 1 , wherein the first axial direction is a horizontal axial direction, and the first DPI ratio is larger than the second DPI ratio.

3. The cursor control apparatus of claim 2 , wherein the first display region and the second display region further comprise an incontiguous zone in the first axial direction, wherein the cursor is confined to the first display region until the second display region is reached when the cursor is moved from the first display region to the second display region via the incontiguous zone.

4. The cursor control apparatus of claim 1 , wherein the first axial direction is a vertical axial direction, and the first DPI ratio is larger than the second DPI ratio.

5. The cursor control apparatus of claim 4 , wherein the first display region and the second display region further comprise an incontiguous zone in the first axial direction, and the cursor is confined to the first display region until the second display region is reached when the cursor is moved from the first display region to the second display region via the incontiguous zone.

6. The cursor control apparatus of claim 1 , wherein when the cursor moves from the first display region to the second display region, the processing unit adjusts the position of the cursor in the second axial direction according to the equation as follows:

Y 1 ′=Y 1(DPI1)+ Lo

wherein Y 1 denotes a distance between the cursor and a boundary of the first display region in the second axial direction, Y 1 ′ denotes a distance between the cursor and a boundary of the second display region in the second axial direction, DPI 1 denotes the first DPI ratio, and Lo denotes a distance between the boundary of first display region and the boundary of the second display region in the second axial direction.

7. The cursor control apparatus of claim 1 , wherein when the cursor moves from the second display region to the first display region, the processing unit adjusts the position of the cursor in the second axial direction according to the equation as follows:

Y 1′=( Y 1− Lo )(DPI2)

wherein Y 1 denotes a distance between the cursor and a boundary of the first display region in the second axial direction, Y 1 ′ denotes a distance between the cursor and a boundary of the second display region in the second axial direction, DPI 2 denotes the second DPI ratio, and Lo denotes a distance between the boundary of first display region and the boundary of the second display region in the second axial direction.

8. The cursor control apparatus of claim 1 , wherein the first DPI ratio and the second DPI ratio are calculated along the first axial direction.

9. A cursor control method, adapted to control a cursor to move back and forth between a benchmark display unit and an extended display unit, wherein the benchmark display unit has a first display region, and the extended display unit has a second display region, wherein the first display region and the second display region are adjacent to each other in a first axial direction, the cursor control method comprising the steps of:

receiving a displacement value generated from a cursor control unit when moved;

calculating a first DPI (dots per inch) ratio of the benchmark display unit to the extended display unit and a second DPI (dots per inch) ratio of the extended display unit to the benchmark display unit;

determining coordinates of a current position of the cursor;

controlling the cursor to move in the first axial direction according to the position coordinates and the displacement value; and

when the cursor moves from the first display region to the second display region, the processing unit adjusting a position of the cursor in a second axial direction according to the first DPI ratio, and when the cursor moves from the second display region to the first display region, adjusting a position of the cursor in the second axial direction according to the second DPI ratio, such that the cursor moves back and forth between the first display region and the second display region substantially linearly, wherein the first axial direction is perpendicular to the second axial direction.

10. The cursor control method of claim 9 , wherein the first axial direction is a horizontal axial direction, and the first DPI ratio is larger than the second DPI ratio.

11. The cursor control method of claim 10 , wherein the first display region and the second display region further comprise an incontiguous zone in the first axial direction, wherein the cursor is confined to the first display region until the second display region is reached when the cursor is moved from the first display region to the second display region via the incontiguous zone.

12. The cursor control method of claim 9 , wherein the first axial direction is a vertical axial direction, and the first DPI ratio is larger than the second DPI ratio.

13. The cursor control method of claim 12 , wherein the first display region and the second display region further comprise an incontiguous zone in the first axial direction, and the cursor is confined to the first display region until the second display region is reached when the cursor is moved from the first display region to the second display region via the incontiguous zone.

14. The cursor control method of claim 9 , wherein when the cursor moves from the first display region to the second display region, the position of the cursor is adjusted in the second axial direction according to the equation as follows:

Y 1′= Y 1( R 1)+ Lo

wherein Y 1 denotes a distance between the cursor and a boundary of the first display region in the second axial direction, Y 1 ′ denotes a distance between the cursor and a boundary of the second display region in the second axial direction, R 1 denotes the first DPI ratio, and Lo denotes a distance between the boundary of first display region and the boundary of the second display region in the second axial direction.

15. The cursor control method of claim 9 , wherein when the cursor moves from the second display region to the first display region, the position of the cursor is adjusted in the second axial direction according to the equation as follows:

Y 1′=( Y 1− Lo )( R 2)

wherein Y 1 denotes a distance between the cursor and a boundary of the first display region in the second axial direction, Y 1 ′ denotes a distance between the cursor and a boundary of the second display region in the second axial direction, R 2 denotes the second DPI ratio, and Lo denotes a distance between the boundary of first display region and the boundary of the second display region in the second axial direction.

16. The cursor control method of claim 9 , wherein the first DPI ratio and the second DPI ratio are calculated along the first axial direction.