Method and system for communication between touch control device and external device

Patent metadata

Field	Value
Publication number	US-2016209983-A1
Application number	US-201615085233-A
Country	US
Kind code	A1
Filing date	Mar 30, 2016
Priority date	Sep 30, 2013
Publication date	Jul 21, 2016
Grant date	—

Abstract

The present invention provides a method for communication between a touch control device and an external device, comprising the following steps: when an external device communicates with a touch screen, sending, by the external device, 1-bit data to the touch screen within each sending period, wherein the 1-bit data sent within each sending period is a combination of a valid signal and an invalid signal, or an invalid signal; scanning, by the touch screen, the bit data based on a predetermined scanning period to obtain N frames of scanned data, wherein the predetermined scanning period is 1/N of the sending period; obtaining a strength of an LCD interference signal according to one frame of data having a minimum signal strength among the N frames of scanned data; and reducing noise for the N frames of scanned data according to the strength of the LCD interference signal.

First claim

What is claimed is:

1 . A method communication between a touch control device and an external device, comprising the following steps:
when an external device communicates with a touch screen of the touch control device, sending, by the external device, 1-bit data to the touch screen within each sending period, wherein the 1-bit data sent within each sending period is a combination of a valid signal and an invalid signal, or an invalid signal; scanning, by the touch screen, the bit data based on a predetermined scanning period to obtain N frames of scanned data, wherein the predetermined scanning period is 1/N of the sending period; obtaining a strength of an LCD interference signal according to one frame of scanned data having a minimum signal strength among the N frames of scanned data; and reducing noise for the N frames of scanned data according to the strength of the LCD interference signal.

2 . The method according to claim 1 , wherein after the reducing noise for the N frames of scanned data according to the strength of the LCD interference signal, the method further comprises:
subtracting the one frame of scanned data having the minimum signal strength from the remaining frames of scanned data in the N frames of scanned data to obtain a difference; comparing the difference with a predetermined value; and obtaining a bit data value corresponding to the bit data according to the comparison result, wherein if the difference is greater than the predetermined value, judging that a value of the corresponding 1-bit data is 1, and otherwise, judging that the value of the corresponding 1-bit data is 0.

3 . The method according to claim 1 , wherein if the 1-bit data sent within each sending period comprises a valid signal, a predetermined valid signal sending time is equal to the scanning period.

4 . The method according to claim 1 , wherein the obtaining a strength of an LCD interference signal according to one frame of data having a minimum signal strength among the N frames of scanned data further comprises:
acquiring at least one frame of scanned data which is a valid signal from the N frames of scanned data; and using a value of a data frame of the at least one frame of scanned data as the strength of the LCD interference signal.

5 . The method according to claim 1 , wherein the touch control device is a mobile terminal, and the external device is a touch pen or a mobile terminal.

6 . A system for communication between a touch control device and an external device, comprising a touch control device and an external device; wherein
when the external device establishes communication with a touch screen of the touch control device, the external device is configured to send 1-bit data to the touch screen within each sending period, wherein the 1-bit data sent within each sending period is a combination of a valid signal and an invalid signal, or an invalid signal; and the touch control device is configured to scan the bit data based on a predetermined scanning period to obtain N frames of scanned data, wherein the predetermined scanning period is 1/N of the sending period; obtain a strength of an LCD interference signal according to one frame of data having a minimum signal strength among the N frames of scanned data; and reduce noise for the N frames of scanned data according to the strength of the LCD interference signal.

7 . The system according to claim 6 , wherein after reducing noise for the N frames of scanned data according to the strength of the LCD interference signal, the touch control device is further configured to: subtract the one frame of scanned data having the minimum signal strength from the remaining frames of scanned data in the N frames of scanned data; compare the difference with a predetermined value; and obtain a bit data value corresponding to the bit data according to the comparison result, wherein if the difference is greater than the predetermined value, judge that a value of the corresponding 1-bit data is 1, and otherwise, judge that the value of the corresponding 1-bit data is 0.

8 . The system according to claim 6 , wherein if the 1-bit data sent within each sending period comprises a valid signal, a predetermined valid signal sending time is equal to the scanning period.

9 . The system according to claim 6 , wherein the touch control device is configured to: acquire at least one frame of scanned data which is a valid signal from the N frames of scanned data; and use a value of a data frame of the at least one frame of scanned data as the strength of the LCD interference signal.

10 . The system according to claim 6 , wherein the touch control device is a mobile terminal, and the external device is a touch pen or a mobile terminal.

Assignees

• Shenzhen Huiding Technology Co

Inventors

• Chen Xiaoxiang
• Fang Jun

Classifications

• G06F3/044 Primary

  by capacitive means · CPC title

• H04B15/005

  Reducing noise, e.g. humm, from the supply · CPC title

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G06F3/0418 Primary

  for error correction or compensation, e.g. based on parallax, calibration or alignment · CPC title