CAPACITIVE TOUCH DEVICE

• US 20140253497A1
• Filed: 01/23/2014
• Published: 09/11/2014
• Est. Priority Date: 03/06/2013
• Status: Abandoned Application

• Current Assignee: PixArt Imaging Incorporated
• Original Assignee: PixArt Imaging Incorporated
• Inventors: KAO, MING-TSAN, CHEN, FU-CHEN, CHEN, YU-HAN
• Application Number:
  US14/161,827
• Publication Number:
  US 20140253497A1
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 1/3262 Power saving in digitizer or tablet
• CPC Class Codes: G06F 3/041661 using detection at multiple resolutions, e.g. coarse and fine scanning; using detection within a limited area, e.g. object tracking window
• 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: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

There is provided a capacitive touch device including a controlling and processing circuit and a touch panel. The touch panel has a plurality of detection cells arranged in matrix. The controlling and processing circuit is configured to input a drive signal to the detection cells of the touch panel and read measurement data from the detection cells for post-processing, wherein the controlling and processing circuit reads a first sampling number of the measurement data of the detection cells in a normal mode and a second sampling number of the measurement data of the detection cells in a sleep mode, and the second sampling number is lower than the first sampling number.

Claims

1. A capacitive touch device, comprising:

a touch panel comprising a plurality of detection cells arranged in matrix; and

a controlling and processing circuit configured to input a drive signal to the detection cells of the touch panel and read measurement data from the detection cells,

wherein the controlling and processing circuit reads a first sampling number of the measurement data of the detection cells in a normal mode and a second sampling number of the measurement data of the detection cells in a sleep mode;

the second sampling number is lower than the first sampling number.

2. The capacitive touch device as claimed in claim 1, wherein the controlling and processing circuit reads the measurement data at a same sampling frequency in the normal mode and the sleep mode;

and in the sleep mode an idle state is entered when the controlling and processing circuit accomplishes reading the second sampling number of the measurement data.

3. The capacitive touch device as claimed in claim 1, wherein in the normal mode the controlling and processing circuit reads the first sampling number of the measurement data of a first region of the detection cells and the second sampling number of the measurement data of a second region of the detection cells.

4. The capacitive touch device as claimed in claim 3, wherein the first region is a predetermined range of the detection cells around a touch point.

5. The capacitive touch device as claimed in claim 4, wherein the second region is all or a part of the detection cells outside the first region.

6. The capacitive touch device as claimed in claim 3, wherein during reading the measurement data of the second region of the detection cells, an idle state is entered when the controlling and processing circuit accomplishes reading the second sampling number of the measurement data.

7. The capacitive touch device as claimed in claim 1, wherein in the sleep mode the controlling and processing circuit reads the second sampling number of the measurement data of only a part of the detection cells.

8. The capacitive touch device as claimed in claim 6, wherein the controlling and processing circuit reads the second sampling number of the measurement data of different parts of the detection cells within adjacent frame intervals.

9. The capacitive touch device as claimed in claim 1, wherein the normal mode and the sleep have identical frame intervals.

10. A capacitive touch device, comprising:

a touch panel comprising a plurality of detection cells arranged in matrix; and

a controlling and processing circuit configured to input a drive signal to the detection cells of the touch panel and read measurement data from the detection cells,

wherein the controlling and processing circuit reads, within a first frame interval, a first sampling number of the measurement data of the detection cells in a normal mode and reads, within a second frame interval, a second sampling number of the measurement data of the detection cells in a sleep mode;

the second sampling number is lower than the first sampling number and the second frame interval is shorter than the first frame interval.

11. The capacitive touch device as claimed in claim 10, wherein in the normal mode the controlling and processing circuit reads, within a third frame interval, the first sampling number of the measurement data of a first region of the detection cells and the second sampling number of the measurement data of a second region of the detection cells, and the third frame interval is shorter than the first frame interval.

12. The capacitive touch device as claimed in claim 11, wherein the first region is a predetermined range of the detection cells around a touch point.

13. The capacitive touch device as claimed in claim 12, wherein the second region is all or a part of the detection cells outside the first region.

14. The capacitive touch device as claimed in claim 10, wherein in the sleep mode the controlling and processing circuit reads the second sampling number of the measurement data of only a part of the detection cells.

15. The capacitive touch device as claimed in claim 14, wherein the controlling and processing circuit reads the second sampling number of the measurement data of different parts of the detection cells within adjacent frame intervals.

16. A capacitive touch device, comprising:

a touch panel comprising a plurality of detection cells arranged in matrix; and

a controlling and processing circuit configured to input a drive signal to the detection cells of the touch panel and read measurement data from the detection cells,

wherein the controlling and processing circuit reads the measurement data of only a part of the detection cells in a sleep mode.

17. The capacitive touch device as claimed in claim 16, wherein the controlling and processing circuit reads the measurement data of different parts of the detection cells within adjacent frame intervals.

18. The capacitive touch device as claimed in claim 16, wherein the part of the detection cells read by the controlling and processing circuit are a chessboard pattern, non-adjacent rows or non-adjacent columns of the detection cells.

19. The capacitive touch device as claimed in claim 16, wherein in a normal mode the controlling and processing circuit reads the measurement data of all of the detection cells, or reads the measurement data of all detection cells in a first region of the detection cells and the measurement data of a part of detection cells in a second region of the detection cells.

20. The capacitive touch device as claimed in claim 19, wherein the first region is a predetermined range of the detection cells around a touch point.