SENSING DEVICE OF SURFACE ACOUSTIC WAVE TOUCH PANEL

• US 20110084941A1
• Filed: 12/16/2010
• Published: 04/14/2011
• Est. Priority Date: 09/20/2007
• Status: Abandoned Application

• Current Assignee: eGalax_eMPIA Technology Inc.
• Original Assignee: eGalax_eMPIA Technology Inc.
• Inventors: Hsieh, Teng-Wei, YEH, SHANG-TAI
• Application Number:
  US12/970,358
• Publication Number:
  US 20110084941A1
• Time in Patent Office: Days
• US Class Current: 345/177
• CPC Class Codes: G06F 3/0436 in which generating transducers and detecting transducers are attached to a single acoustic waves transmission substrate

Abstract

Described is a sensing device of a surface acoustic wave (SAW) touch panel having a new reflector columns and rows arrangement. As compared to the conventional design in the art where each of the reflector columns and rows are arranged from thinness to thickness, each of the arrangements of the reflector columns and rows herein is composed of a plurality of uniformly disposed reflectors having several sub-reflectors isolated with a gap or gaps.

Claims

1. A surface acoustic wave touch panel, comprising:

a substrate for providing transmission of a surface acoustic wave;

a reflector array including a plurality of pairs of reflectors, each pair of reflectors determining a path on the substrate, respectively, wherein these reflectors include a plurality of dashed-line reflectors, each dashed-line reflector including a plurality of sub-reflectors spaced apart by at least a gap;

at least one transmitter for generating a surface acoustic wave; and

at least one receiver for generating a signal based on the surface acoustic wave transmitted by each path, wherein the physical total length of the pair of reflectors that transmit the surface acoustic wave on each path determines the amount of the surface acoustic wave transmitted on the path.

2. The surface acoustic wave touch panel of claim 1, wherein the physical total length of each dashed-line reflector does not include the lengths of all the gaps.

3. The surface acoustic wave touch panel of claim 1, wherein the total length of all the gaps of the pair of reflectors closer to the at least one transmitter and the at least one receiver is longer.

4. The surface acoustic wave touch panel of claim 1, wherein the magnitude of the signal is determined based on the length of the path and the physical total length of the pair of reflectors that transmit the surface acoustic wave.

5. The surface acoustic wave touch panel of claim 1, wherein the lengths of these reflectors are the same, wherein the length of each dashed-line reflector includes the lengths of all the gaps.

6. The surface acoustic wave touch panel of claim 1, wherein the heights of these reflectors are the same.

7. The surface acoustic wave touch panel of claim 1, wherein separations between each reflector and its neighboring reflectors are equal.

8. A method for configuring a reflector array of a surface acoustic wave touch panel, comprising:

providing a substrate for providing transmission of a surface acoustic wave;

determining the locations of a plurality of pairs of reflectors of the reflector array on the substrate;

providing the reflector array based on the locations of the plurality of pairs of reflectors of the reflector array on the substrate, each pair of reflectors determining a path on the substrate, respectively, wherein these reflectors include a plurality of dashed-line reflectors, each dashed-line reflector including a plurality of sub-reflectors spaced apart by at least a gap;

providing at least one transmitter for generating a surface acoustic wave;

providing at least one receiver for generating a signal based on the surface acoustic wave transmitted by each path, wherein the physical total length of the pair of reflectors that transmit the surface acoustic wave on each path determines the amount of the surface acoustic wave transmitted on the path; and

adjusting the total length of the gap of each dashed-line reflector based on the signal, so that the signal is maintained at a zero-value range during a detection period.

9. The method of claim 8, wherein the physical total length of each dashed-line reflector does not include the lengths of all the gaps.

10. The method of claim 8, wherein the closer a pair of reflectors is to the at least one transmitter and the at least one receiver, the longer the total length of all the gaps of the pair of reflectors.

11. The method of claim 8, wherein the magnitude of the signal is determined based on the length of the path and the physical total length of the pair of reflectors that transmit the surface acoustic wave.

12. The method of claim 8, wherein the lengths of these reflectors are the same, wherein the length of each dashed-line reflector includes the lengths of all the gaps.

13. The method of claim 8, wherein the heights of these reflectors are the same.

14. The method of claim 8, wherein separations between each reflector and its neighboring reflectors are equal.

15. A method for configuring a reflector array of a surface acoustic wave touch panel, comprising:

providing a substrate for providing transmission of a surface acoustic wave;

providing the reflector array including a plurality of pairs, each pair of reflectors include a plurality of dashed-line reflectors, each dashed-line reflector including a plurality of sub-reflectors spaced apart by at least a gap;

providing at least one transmitter for generating a surface acoustic wave;

providing at least one receiver for generating a signal based on the surface acoustic wave transmitted by each path, wherein the physical total length of the pair of reflectors that transmit the surface acoustic wave on each path determines the amount of the surface acoustic wave transmitted on the path; and

adjusting the locations of these reflectors based on the signal, so that the signal is maintained at a zero-value range during a detection period.

16. The method of claim 15, wherein the physical total length of each dashed-line reflector does not include the lengths of all the gaps.

17. The method of claim 15, wherein the closer a pair of reflectors is to the at least one transmitter and the at least one receiver, the longer the total length of all the gaps of the pair of reflectors.

18. The method of claim 15, wherein the magnitude of the signal is determined based on the length of the path and the physical total length of the pair of reflectors that transmit the surface acoustic wave.

19. The method of claim 15, wherein the lengths of these reflectors are the same, wherein the length of each dashed-line reflector includes the lengths of all the gaps.

20. The method of claim 15, wherein the heights of these reflectors are the same.

21. The method of claim 15, wherein separations between each reflector and its neighboring reflectors are equal.