LIGHT POINTING DEVICE EMPLOYED IN INPUT APPARATUS, DRIVING METHOD AND INPUT APPARATUS USING THE SAME

• US 20080284757A1
• Filed: 01/29/2008
• Published: 11/20/2008
• Est. Priority Date: 05/16/2007
• Status: Active Grant

• Current Assignee: HannStar Display Corporation
• Original Assignee: HannStar Display Corporation
• Inventors: Yang, Kei Hsiung, Chen, Po Yang
• Granted Patent: US 8,284,175 B2
• Time in Patent Office: Days
• US Class Current: 345/183
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: G06F 3/042 by opto-electronic means
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

A light pointing device employed in an input apparatus comprises a signal receiving interface and a light emitting component. The signal receiving interface is used to receive a system signal from the input apparatus. The light emitting component can generate a flashing light source whose intermittence cycle is synchronized with the reference clock cycle of the system signal Furthermore, the ratio of the intermittence cycle of the flashing light source to the reference clock cycle of the system signal is a natural number.

Claims

1. A light pointing device employed in an input apparatus, comprising:

a signal receiving interface receiving a system signal from the input apparatus; and

a light emitting component generating a flashing light source;

wherein an intermittence cycle of the flashing light source is synchronized with a reference clock cycle of the system signal.

2. The light pointing device employed in an input apparatus as claimed in claim 1, wherein the system signal is a clock signal, a vertical start pulse or a vertical clock pulse.

3. The light pointing device employed in an input apparatus as claimed in claim 1, wherein the ratio of the intermittence cycle of the flashing light source to the reference clock cycle of the system signal is a natural number.

4. The light pointing device employed in an input apparatus as claimed in claim 1, wherein the signal receiving interface receives the system signal through wireless communication.

5. The light pointing device employed in an input apparatus as claimed in claim 1, wherein the signal receiving interface receives the system signal through a cable line.

6. The light pointing device employed in an input, apparatus as claimed in claim 1, wherein the light emitting component is a light emitting diode.

7. The light pointing device employed in an input apparatus as claimed in claim 1, further comprising a driving circuit generating a driving signal based on the system signal, wherein the driving signal drives the light emitting component to generate the flashing light source.

8. The light pointing device employed in an input apparatus as claimed in claim 7, further comprising a decoder converting the format of the system signal, and a signal converted by the decoder is outputted to the driving circuit.

9. The light pointing device employed in an input apparatus as claimed in claim 1, wherein the input apparatus is an embedded-type touch panel.

10. The light pointing device employed in an input apparatus as claimed in claim 1, wherein the light pointing device is a light pen.

11. A liquid crystal display device with an input function, comprising:

a liquid-crystal display panel;

a pointing device, comprising;

a signal receiving interface receiving a system signal of the input apparatus; and

a light emitting component generating a flashing light source;

wherein an intermittence cycle of the flashing light source is synchronized with a reference clock cycle of the system signal.

12. The liquid crystal display device with an input function as claimed in claim 11, wherein the system signal is a clock signal, a vertical start pulse or a vertical clock pulse.

13. The liquid crystal display device with an input function as claimed in claim 11, wherein the ratio of the intermittence cycle of the flashing light source to the reference clock cycle of the system signal is a natural number.

14. The liquid crystal display device with an input function as claimed in claim 11, wherein the light emitting component is a light emitting diode.

15. The liquid crystal display device with an input function as claimed in claim 11, wherein the input apparatus is a light pen.

16. A method for driving a light pointing device, comprising the steps of:

receiving a system signal of an input apparatus; and

generating a driving signal for driving a light source of a light pointing device according to the system signal, wherein the driving signal is synchronized with the reference clock cycle of the system signal.

17. The method of driving the light pointing device as claimed in claim 16, wherein the system signal is a clock signal, a vertical start pulse or a vertical clock pulse.

18. The method of driving the light pointing device as claimed in claim 16, further comprising a step of decoding the system signal to generate the driving signal.

19. The method of driving the light pointing device as claimed in claim 16, further comprising a step of generating a flashing light source according the driving signal, wherein the ratio of the intermittence cycle of the flashing light source to the reference clock cycle of the system signal is a natural number.

20. The method of driving drive the light pointing device as claimed in claim 16, wherein the light pointing device is a light pen.