Capacitive Touchscreen or Touch Panel with Fingerprint Reader

• US 20120182253A1
• Filed: 01/17/2011
• Published: 07/19/2012
• Est. Priority Date: 01/17/2011
• Status: Active Grant

• Current Assignee: PixArt Imaging Incorporated
• Original Assignee: Avago Technologies ECBU IP Singapore Pte Limited (Broadcom, Inc.)
• Inventors: Brosnan, Michael
• Granted Patent: US 9,310,940 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 21/00 Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
• CPC Class Codes: G06F 21/32 using biometric data, e.g. fingerprints, iris scans or voiceprints
• CPC Class Codes: G06F 21/83 input devices, e.g. keyboards, mice or controllers thereof
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G06V 40/1306 non-optical, e.g. ultrasonic or capacitive sensing

Abstract

Various embodiments of a capacitive touchscreen or touch panel having dual finger or hand navigation and fingerprint reading capabilities. In one embodiment, fingerprints are read and processed by the same capacitive touchscreen controller that reads and processes capacitively-sensed finger or hand touches made across the touchscreen or touch panel. A small portion of the capacitive touchscreen or touch panel is dedicated to reading an authorized user'"'"'s fingerprints, while a larger or main portion of the capacitive touchscreen or touch panel is dedicated to sensing a user'"'"'s finger or hand navigation across the touchscreen or touch panel.

Claims

1. A capacitive touchscreen or touch panel system, comprising:

a touchscreen comprising a first plurality of electrically conductive drive electrodes arranged in rows or columns, and a second plurality of electrically conductive sense electrodes arranged in rows or columns arranged at an angle with respect to the rows or columns of the first plurality of electrodes, mutual capacitances existing between the first and second pluralities of electrodes at locations where the first and second pluralities of electrodes intersect to form first and second groups of individual cells having first and second cell dimensions associated therewith, respectively, the mutual capacitances changing in the presence of one or more fingers of a user or touch devices brought into proximity thereto;

drive circuitry operably connected to the first plurality of drive electrodes, and

at least first sense circuitry operably connected to the second plurality of sense electrodes of the first group and the second group,

wherein the first group and first cell dimensions are configured to permit the detection by the first sense circuitry of the presence of the one or more fingers of the user or touch devices brought into proximity thereto, and the second group and second cell dimensions form a fingerprint reader configured to permit at least one fingerprint from the user'"'"'s finger to be read by the first sense circuitry associated therewith.

2. The touchscreen or touch panel system of claim 1, wherein the first and second groups of the second plurality of sense electrodes are operably connected to the first sense circuitry at the same time.

3. The touchscreen or touch panel system of claim 1, wherein at any given time at least one of the first group and the second group is operably connected to the first sense circuitry.

4. The touchscreen or touch panel system of claim 3, wherein the first group or the second group is operably connected to the first sense circuitry via controllable switches.

5. The touchscreen or touch panel system of claim 4, wherein the controllable switches are operably connected to at least one of the first plurality of electrodes and the second plurality of electrodes.

6. The touchscreen or touch panel system of claim 4, wherein the controllable switches are thin film transistors.

7. The touchscreen or touch panel system of claim 4, wherein the first plurality of electrodes and the second plurality of electrodes are disposed on a glass substrate.

8. The touchscreen or touch panel system of claim 1, wherein the second group is located in a distinct and separate region of the touchscreen apart from the first group.

9. The touchscreen or touch panel of claim 8, wherein the first group is defined by an outer perimeter,

10. The touchscreen or touch panel of claim 9, wherein at least a portion of the outer perimeter adjoins at least a portion of the first group.

11. The touchscreen or touch panel system of claim 1, wherein the second group of cells is located near or in a corner of the touchscreen.

12. The touchscreen or touch panel system of claim 1, wherein the second group forms a rectangle, square, circle or oval.

13. The touchscreen or touch panel system of claim 1, wherein the at least first sense circuitry further comprises first sense circuitry operably connected to the second plurality of sense electrodes of the first group, and second sense circuitry operably connected to the second plurality of sense electrodes of the second group.

14. The touchscreen or touch panel system of claim 1, wherein first data associated with one or more fingers of the user or touch devices being brought into proximity to the touchscreen or touch panel thereto and second data associated with reading the at least one fingerprint are processed by a single touchscreen controller.

15. The touchscreen or touch panel system of claim 1, wherein the first group of individual cells has cell dimensions associated therewith ranging between about 4 mm and about 6 mm, between about 3 mm and about 7 mm, between about 2 mm and about 8 mm, and between about 1 mm and about 10 mm.

16. The touchscreen or touch panel system of claim 1, wherein the second group of individual cells has cell dimensions associated therewith ranging between about 5 micrometers and about 200 micrometers, between about 10 micrometers and about 100 micrometers, between about 20 micrometers and about 80 micrometers, and between about 30 micrometers and about 70 micrometers.

17. A method of detecting touches or near-touches and an authorized user'"'"'s fingerprint on a capacitive touchscreen or touch panel system, the system comprising a touchscreen comprising a first plurality of electrically conductive drive electrodes arranged in rows or columns, and a second plurality of electrically conductive sense electrodes arranged in rows or columns arranged at an angle with respect to the rows or columns of the first plurality of electrodes, mutual capacitances existing between the first and second pluralities of electrodes at locations where the first and second pluralities of electrodes intersect to form first and second groups of individual cells having first and second cell dimensions associated therewith, respectively, the mutual capacitances changing in the presence of one or more fingers of a user or touch devices brought into proximity thereto, drive circuitry operably connected to the first plurality of drive electrodes, and at least first sense circuitry operably connected to the second plurality of sense electrodes of the first group and the second group, wherein the first group and first cell dimensions are configured to permit the detection by the first sense circuitry of the presence of the one or more fingers of the user or touch devices brought into proximity thereto, and the second group and second cell dimensions form a fingerprint reader configured to permit at least one fingerprint from the user'"'"'s finger to be read by the first sense circuitry associated therewith, the method comprising sensing at least one touch or near touch of a finger, finger portion, hand or hand portion brought into proximity to the first group on the touchscreen or touch panel.

18. The method of claim 17, further comprising , and acquiring a fingerprint frame of the user'"'"'s finger brought into contact with at least a portion of the second group on the touchscreen or touch panel.

19. The method of claim 18, further comprising extracting fingerprint parameters associated with the fingerprint frame.

20. The method of claim 19, further comprising saving the extracted fingerprint parameters in a memory.

21. The method of claim 20, wherein the acquiring, extracting and saving steps are associated with an enrollment phase for the user.

22. The method of claim 21, further comprising requesting the user'"'"'s name or ID as part of the enrollment phase.

23. The method of claim 20, wherein the acquiring and extracting steps are associated with an authentication phase for the user.

24. The method of claim 23, further comprising comparing the extracted fingerprint parameters to authorized user fingerprint parameters stored in a memory.

25. The method of claim 24, further comprising determining whether the extracted fingerprint parameters and the authorized user fingerprint parameters match sufficiently well that the extracted fingerprint parameters are determined to be associated with the authorized user.

26. The method of claim 17, further comprising operably connecting the first group or the second group to the first sense circuitry via controllable switches.

27. The method of claim 26, further comprising operably connecting the controllable switches to at least one of the first plurality of electrodes and the second plurality of electrodes.

28. The method of claim 17, further comprising operably connecting the first sense circuitry operably connected to the second plurality of sense electrodes of the first group, and second sense circuitry to the second plurality of sense electrodes of the second group.

29. The method of claim 17, further comprising processing first data associated with one or more fingers of the user or touch devices being brought into proximity to the touchscreen or touch panel thereto and associating second data with reading the at least one fingerprint.

30. The method of claim 17, further comprising processing the first and second data with a single touchscreen controller.