CONTROL DEVICE AND CONTROL METHOD FOR IMAGE DISPLAY

• US 20110032230A1
• Filed: 10/21/2010
• Published: 02/10/2011
• Est. Priority Date: 02/15/2007
• Status: Active Grant

• Current Assignee: PixArt Imaging Incorporated
• Original Assignee: PixArt Imaging Incorporated
• Inventors: HUANG, Chao Chien, SUN, Cheng Kuang, HSU, En Feng, LIN, Cho Yi
• Granted Patent: US 8,749,483 B2
• Time in Patent Office: Days
• US Class Current: 345/207
• CPC Class Codes: G06F 3/0346 with detection of the device orientation or free movement in a 3D space, e.g. 3D mice, 6-DOF [six degrees of freedom] pointers using gyroscopes, accelerometers or tilt-sensors

Abstract

A control device for an image display includes at least two reference points, a modulation unit and a remote controller. The modulation unit modulates the light of a predetermined spectrum generated by the reference points with a brightness variation cycle. The modulation unit controls the reference points to emit the light with a first brightness within a first period of the brightness variation cycle and to emit the light with a second brightness within a second period of the brightness variation cycle, wherein the first brightness and the second brightness are not zero gray level. The remote controller captures the light of the predetermined spectrum with a sampling cycle and demodulates an image variation of the reference points with respect to the remote controller. The present invention further provides a control method for an image display.

Claims

1. A control device of an image display, comprising:

at least two reference points configured to generate the light of a predetermined spectrum;

a modulation unit configured to modulate the light of the predetermined spectrum generated by the reference points with a brightness variation cycle, wherein the modulation unit is configured to control the reference points to emit the light with a first brightness within a first period of the brightness variation cycle and to emit the light with a second brightness within a second period of the brightness variation cycle; and

a remote controller configured to capture the light of the predetermined spectrum with a sampling cycle and demodulate an image variation of the reference points with respect to the remote controller;

wherein the first brightness and the second brightness are not zero gray level.

2. The control device as claimed in claim 1, wherein the second brightness is half or twice the first brightness.

3. The control device as claimed in claim 1, wherein the brightness variation cycle is an integer multiple of the sampling cycle.

4. The control device as claimed in claim 1, further comprising two diffusers positioned in front of the reference points, respectively.

5. The control device as claimed in claim 1, wherein the remote controller further comprises:

an image sensor configured to capture the light of the predetermined spectrum with the sampling cycle and generate a digital signal; and

a processing unit configured to receive and demodulate the digital signal to form a digital image and then obtain the image variation of the reference points with respect to the remote controller according to the digital image.

6. The control device as claimed in claim 5, wherein the remote controller further comprises:

an optical filter positioned in front of the image sensor to remove the light out of the predetermined spectrum; and

a wireless communication unit configured to communicate with the image sensor.

7. The control device as claimed in claim 1, wherein the reference points have different areas.

8. A control device of an image display, comprising:

a first reference point and a second reference point configured to generate the light of a predetermined spectrum;

a modulation unit configured to modulate the light generated by the first reference point with a first cycle and the light generated by the second reference point with a second cycle, wherein the modulation unit is configured to control the first reference point to emit the light with a first brightness within a first period of the first cycle and to emit the light with a second brightness within a second period of the first cycle, and the modulation unit is configured to control the second reference point to emit the light with a third brightness within a third period of the second cycle and to emit the light with a fourth brightness within a fourth period of the second cycle; and

a remote controller configured to capture the light of the predetermined spectrum with a sampling cycle and demodulate an image variation of the first and second reference points with respect to the remote controller;

wherein the first brightness, the second brightness, the third brightness and the fourth brightness are not zero gray level.

9. The control device as claimed in claim 8, wherein the second brightness is half or twice the first brightness, and the fourth brightness is half or twice the third brightness.

10. The control device as claimed in claim 8, wherein the first cycle, the second cycle and the sapling cycle are an integer multiple of each other.

11. The control device as claimed in claim 8, further comprising two diffusers positioned in front of the first and second reference points, respectively.

12. The control device as claimed in claim 8, wherein the remote controller further comprises:

an image sensor configured to capture the light of the predetermined spectrum with the sampling cycle and generate a digital signal; and

a processing unit configured to receive and demodulate the digital signal to form a digital image and then obtain the image variation of the first and second reference points with respect to the remote controller according to the digital image.

13. The control device as claimed in claim 12, wherein the remote controller further comprises:

an optical filter positioned in front of the image sensor to remove the light out of the predetermined spectrum; and

a wireless communication unit configured to communicate with the image sensor.

14. The control device as claimed in claim 8, wherein the first cycle is equal to the second cycle.

15. The control device as claimed in claim 8, wherein the first and second reference points have identical or different areas.

16. A control method for an image display, comprising the steps of:

providing a first reference point and a second reference point to generate the light of a predetermined spectrum;

modulating the light generated by the first reference point with a first cycle so that the first reference point emits the light with a first brightness within a first period of the first cycle and emits the light with a second brightness within a second period of the first cycle;

modulating the light generated by the second reference point with a second cycle so that the second reference point emits the light with a third brightness within a third period of the second cycle and emits the light with a fourth brightness within a fourth period of the second cycle; and

providing a remote controller to capture the light of the predetermined spectrum with a sampling cycle and demodulate an image variation of the first and second reference points with respect to the remote controller;

wherein the first brightness, the second brightness, the third brightness and the fourth brightness are not zero gray level.

17. The control method as claimed in claim 16, further comprising:

transmitting the image variation to an image display; and

controlling the image display to perform a corresponding action according to the image variation.

18. The control method as claimed in claim 16, wherein the second brightness is half or twice the first brightness, and the fourth brightness is half or twice the third brightness.

19. The control method as claimed in claim 16, wherein the first cycle, the second cycle and the sapling cycle are an integer multiple of each other.

20. The control method as claimed in claim 16, wherein the first cycle is equal to the second cycle.

21. The control method as claimed in claim 20, wherein the first brightness is equal to the third brightness and the second brightness is equal to the fourth brightness, or the first brightness is equal to the fourth brightness and the second brightness is equal to the third brightness.