Touch identification device on the basis of doppler effect, touch identification method on the basis of doppler effect and touch screen

Patent metadata

Field	Value
Publication number	US-9760202-B2
Application number	US-201414439335-A
Country	US
Kind code	B2
Filing date	Aug 29, 2014
Priority date	Apr 28, 2014
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

The present invention discloses a touch identification device on the basis of Doppler effect, a touch identification method on the basis of Doppler effect and a touch screen, wherein the touch identification device comprises: a first transceiving module used for transmitting a first detection wave along a first direction and receiving a first feedback wave formed from the first detection wave after being reflected by a touch body; a second transceiving module used for transmitting a second detection wave along a second direction and receiving a second feedback wave formed from the second detection wave after being reflected by the touch body; and a calculation module used for calculating a moving speed and a moving direction of the touch body at the touch point according to the first detection wave, the first feedback wave, the second detection wave and the second feedback wave.

First claim

The invention claimed is:

1. A touch identification device on the basis of Doppler effect, comprising:
a first transceiving module used for transmitting a first detection wave along a first direction and receiving a first feedback wave formed from the first detection wave after being reflected by a touch body;
a second transceiving module used for transmitting a second detection wave along a second direction and receiving a second feedback wave formed from the second detection wave after being reflected by the touch body, an arrival angle from the first direction to the second direction being a predetermined angle, and the first direction and the second direction being intersected at a touch point of the touch body; and
a calculation module connected with the first transceiving module and the second transceiving module, and used for calculating a moving speed and a moving direction of the touch body at the touch point according to the first detection wave, the first feedback wave, the second detection wave and the second feedback wave,
wherein the first detection wave and the second detection wave are both electromagnetic waves;
the calculation module is used for, according to the following formula:

f
3

=

f
1

*

1
-

v
2

c
2

1
+

v
*
cos
⁢

⁢

θ
1

c

;

f
4

=

f
2

*

1
-

v
2

c
2

1
+

v
*
cos
⁢

⁢

θ
2

c

;
and

θ
1

+

θ
2

=

θ
0

;

calculating the moving speed v, an included angle θ 1 when the first direction is anticlockwise rotated to the moving direction, and an included angle θ 2 when the moving direction is anticlockwise rotated to the second direction;
the calculation module judges whether θ 1 and θ 2 are negative values, if the calculation module judges that θ 1 or θ 2 is a negative value, then the calculation module determines that the calculated θ 1 and θ 2 are invalid calculation results, and is used for, according to the following formula:

f
3

=

f
1

*

1
-

v
2

c
2

1
+

v
*
cos
⁢

⁢

θ
1

c

;

f
4

=

f
2

*

1
-

v
2

c
2

1
+

v
*
cos
⁢

⁢

θ
2

c

;

Assignees

• Boe Technology Group Co Ltd

Inventors

• Chen Yanshun
• Wang Hong
• Li Yaohui
• Xu Qiushi

Classifications

• G06F3/046

  by electromagnetic means · CPC title

• G06F3/042

  by opto-electronic means · CPC title

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title