NAVIGATION DEVICE AND IMAGE DISPLAY SYSTEM

• US 20150177857A1
• Filed: 12/24/2013
• Published: 06/25/2015
• Est. Priority Date: 12/24/2013
• Status: Active Grant

• Current Assignee: PixArt Imaging Incorporated
• Original Assignee: PixArt Imaging Incorporated
• Inventors: CHIN, KIAN-MING, CHONG, YIK-LEONG
• Granted Patent: US 9,727,148 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/0317 in co-operation with a patterned surface, e.g. absolute position or relative movement detection for an optical mouse or pen positioned with respect to a coded surface
• CPC Class Codes: G06F 3/03541 Mouse/trackball convertible devices, in which the same ball is used to track the 2D relative movement

Abstract

There is provided an image display system including a navigation device and an inertial unit. The navigation device outputs displacements at a report rate. The inertial unit may provide an inertial displacement for continuously controlling a cursor motion after the displacements decrease to zero.

Claims

1. A navigation device, operating on a work surface, the navigation device comprising:

an image sensor configured to successively capture image frames of the work surface;

a processing unit configured to calculate displacements of the navigation device with respect to the work surface according to the image frames;

an output interface configured to output the displacements at a report rate; and

an inertial unit configured to analyze a plurality of displacements within a predetermined period and provide an inertial displacement for being outputted by the output interface when at least one of the displacements within the predetermined period is larger than a threshold and the displacements decrease to zero within the predetermined period.

2. The navigation device as claimed in claim 1, further comprising an inertial switch configured to generate an enable signal to enable the inertial unit.

3. The navigation device as claimed in claim 1, wherein the inertial displacement is a maximum displacement or an average displacement within the predetermined period.

4. The navigation device as claimed in claim 1, wherein the inertial unit decreases the inertial displacement once every inertial period.

5. The navigation device as claimed in claim 4, wherein the inertial unit decreases the inertial displacement with a decreasing ratio, and the decreasing ratio is selected from a user graphic interface or set previously.

6. The navigation device as claimed in claim 1, wherein during the output interface outputting the inertial displacement, the output interface stops outputting the inertial displacement when the processing unit detects a click signal, a roller signal, a nonzero displacement, a sense signal of a capacitive touch device or a sense signal of an optical finger navigation.

7. An image display system, comprising:

an image display device, comprising;

a screen displaying a cursor; and

a host configured to control images displayed by the screen; and

a navigation device, comprising;

an image sensor configured to successively capture image frames of a work surface;

a processing unit configured to calculate displacements of the navigation device with respect to the work surface according to the image frames;

an output interface configured to output the displacements to the host at a report rate to allow the host to control the cursor according to the displacements; and

a multi-cursor switch configured to generate a control signal for controlling the host to display a plurality of sub-cursors around the cursor and separated by a predetermined pixel distance.

8. The image display system as claimed in claim 7, wherein the predetermined pixel distance is selected from a user graphic interface, set previously or determined according to a size of the screen.

9. The image display system as claimed in claim 7, wherein the host controls one of the sub-cursors to display with different feature to be served as a main control sub-cursor.

10. The image display system as claimed in claim 9, wherein the navigation device further comprises at least one control button or a roller configured to select the main control sub-cursor between the sub-cursors.

11. The image display system as claimed in claim 7, wherein the cursor and the sub-cursors move synchronously according to the displacement.

12. The image display system as claimed in claim 7, wherein the navigation device further comprises an inertial unit configured to analyze a plurality of displacements within a predetermined period, and provide an inertial displacement for being outputted by the output interface when at least one of the displacements within the predetermined period is larger than a threshold and the displacements decrease to zero within the predetermined period.

13. The image display system as claimed in claim 12, wherein the cursor and the sub-cursors move synchronously according to the inertial displacement.

14. An image display system, comprising:

a navigation device outputting displacements at a report rate; and

an image display device, comprising;

a screen displaying a cursor; and

a host comprising an inertial unit configured to analyze a plurality of displacements received from the navigation device within a predetermined period, and the host being configured to control the cursor with an inertial displacement when at least one of the displacements within the predetermined period is larger than a threshold and the displacements decrease to zero within the predetermined period.

15. The image display system as claimed in claim 14, wherein the host decreases the inertial displacement once every inertial period.

16. The image display system as claimed in claim 15, wherein the host decreases the inertial displacement with a decreasing ratio, and the decreasing ratio is selected from a user graphic interface, set previously or determined according to a size of the screen.

17. The image display system as claimed in claim 14, wherein when the cursor reaches an edge of the screen, the host stops controlling the cursor with the inertial displacement.

18. The image display system as claimed in claim 14, wherein the navigation device comprises an inertial switch configured to generate an enable signal to the host for enabling the inertial unit.

19. The image display system as claimed in claim 14, wherein the inertial displacement is a maximum displacement or an average displacement within the predetermined period.

20. The image display system as claimed in claim 14, wherein during the host controlling the cursor with the inertial displacement, the navigation unit outputs a disable signal to the host for disabling the inertial unit when detecting a click signal, a roller signal, a nonzero displacement, a sense signal of a capacitive touch device or a sense signal of an optical finger navigation.