TOUCH SIGNAL SCAN APPARATUS AND TOUCH SIGNAL SCAN METHOD

• US 20140146009A1
• Filed: 11/05/2013
• Published: 05/29/2014
• Est. Priority Date: 11/27/2012
• Status: Active Grant

• Current Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited)
• Original Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited)
• Inventors: HUANG, Zhongshou
• Granted Patent: US 9,229,595 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• 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

Abstract

A touch signal scan apparatus and a touch signal scan method are disclosed. The apparatus includes: a drive signal supply unit electrically connected with M drive lines in one-to-one correspondence, an electrode layer in which the M drive lines and N sense lines are arranged, and N amplifiers electrically connected with different output ends of the N sense lines in one-to-one correspondence. The drive signal supply unit is configured to supply drive signals with at least two different frequencies to the M drive lines in a period of one frame, and the frequencies of the drive signals supplied to two adjacent drive lines are different. The apparatus further includes a bandwidth filter electrically connected with the N amplifiers and configured to separate sense signals output from the N amplifiers so as to obtain the sense signals corresponding to the respective drive signals with the at least two different frequencies.

Claims

1. A touch signal scan apparatus, comprising:

a drive signal supply unit electrically connected with M drive lines in one-to-one correspondence;

an electrode layer in which the M drive lines and N sense lines are arranged;

N amplifiers electrically connected with different output ends of the N sense lines in one-to-one correspondence; and

a bandwidth filter electrically connected with the N amplifiers;

wherein;

the drive signal supply unit is configured to supply drive signals with at least two different frequencies to the M drive lines in a period of one frame, and the frequencies of the drive signals supplied to two adjacent ones of the drive lines are different; and

wherein the bandwidth filter is configured to separate sense signals output from the N amplifiers so as to obtain the sense signals corresponding to the respective drive signals with the at least two different frequencies.

2. The apparatus according to claim 1, wherein the drive signal supply unit is electrically connected with the M drive lines through M amplifiers.

3. The apparatus according to claim 1, wherein signal input ends of two adjacent lines of the M drive lines are at a same side of the electrode layer.

4. The apparatus according to claim 1, wherein signal input ends of two adjacent lines of the M drive lines are at different sides of the electrode layer.

5. A touch signal scan method, comprising following steps:

supplying drive signals with at least two different frequencies to M drive lines in a period of one frame, wherein the frequencies of the drive signals supplied to two adjacent drive lines are different;

outputting sense signals with same frequencies as the drive signals with the at least two different frequencies by N sense lines to a bandwidth filter, the bandwidth filter being electrically connected with N amplifiers, wherein the N amplifiers are electrically connected with the N sense lines in one-to-one correspondence; and

separating the sense signals with the different frequencies by the bandwidth filter so as to obtain the sense signals corresponding to the respective drive signals with the at least two different frequencies.

6. The method according to claim 5, wherein the drive signals with the at least two different frequencies are supplied to the M drive lines through M amplifiers.

7. The method according to claim 5, wherein the drive signals are supplied to a same side of two adjacent lines of the M drive lines.

8. The method according to claim 5, wherein the drive signals are supplied to different sides of two adjacent lines of the M drive lines.

9. The method according to claim 5, wherein the drive signals with two different frequencies are supplied to the drive lines, and the frequencies of the drive signals supplied to every other drive lines are the same.

10. The method according to claim 5, wherein the frequencies of the drive signals supplied to each one of the drive lines are different.

11. The method according to claim 9, wherein the drive signals supplied to the M drive lines with the two different frequencies have a same scan direction or opposite scan directions.

12. The method according to claim 9, wherein the frequencies of the drive signals supplied to two adjacent lines of the drive lines are swapped in a period of two adjacent frames.

13. The method according to claim 10, wherein the drive signals with the different frequencies are supplied to the M drive lines at the same time.