METHOD AND APPARATUS FOR RECOGNIZING TOUCH

• US 20100283756A1
• Filed: 01/26/2010
• Published: 11/11/2010
• Est. Priority Date: 05/06/2009
• Status: Abandoned Application

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Ku, Ja-Seung, Kim, Jae-Shin, Hwang, Hee-Chul, Lee, Min-Jeung
• Application Number:
  US12/694,240
• Publication Number:
  US 20100283756A1
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• CPC Class Codes: G06F 3/0425 using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected tracking a projected light spot to determine a position on a display surface G06F3/0386

Abstract

A method for recognizing a touch of an object on a display device including optical sensors, the method including: detecting a touch of an object by utilizing a contact-detecting layer in the display device; generating an image of the touch of the object corresponding to sensor signals sensed by the optical sensors; detecting touch points corresponding to the image of the touch of the object; and determining information of the touch of the object based on the detected touch points.

Claims

1. A method for recognizing a touch of an object on a display device comprising optical sensors, the method comprising:

detecting a touch of an object by utilizing a contact-detecting layer in the display device;

controlling a sensor scanning unit to output sensor scan signals for driving the optical sensors when the touch of the object is detected;

generating an image of the touch of the object corresponding to sensor signals sensed by the optical sensors;

detecting touch points corresponding to the image of the touch of the object; and

determining information of the touch of the object based on the detected touch points.

2. The method of claim 1, wherein the controlling of the sensor scanning unit comprises determining whether a signal corresponding to the touch of the object is greater than a value, wherein when the signal corresponding to the touch of the object is greater than the value, the sensor scanning unit outputs the sensor scan signals.

3. The method of claim 1, wherein in the detecting of the touch points, the touch points are detected in the image of the touch of the object, and coordinates of the touch points are calculated.

4. The method of claim 1, wherein the touch of the object is a double click.

5. The method of claim 4, wherein in the detecting of the touch points, two touch points are detected in the image of the touch of the object, and coordinates of the two touch points are calculated, and wherein in the determining of the information of the touch of the object, a double click is determined by calculating a time interval and a space interval between the two touch points.

6. The method of claim 5, wherein the touch of the object is determined to be a double click when the time interval is smaller than a first value and the space interval is smaller than a second value.

7. A recording medium in which a program for implementing the method according to claim 1 in a computer is recorded.

8. A method for recognizing a touch of an object on a display device comprising optical sensors, the method comprising:

detecting a touch of an object by utilizing a contact-detecting layer in the display device;

generating an image of the touch of the object corresponding to sensor signals sensed by the optical sensors;

detecting touch points corresponding to the image of the touch of the object;

performing preprocessing of the detected touch points corresponding to the detecting of the touch of the object; and

determining information of the touch of the object based on the touch points after performing the preprocessing.

9. The method of claim 8, wherein the performing the preprocessing of the detected touch points comprises excluding some of the detected touch points based on a time when the touch of the object is detected.

10. The method of claim 9, wherein the touch of the object is a double click.

11. The method of claim 10, wherein in the detecting of the touch points, at least two touch points are detected in the image of the touch of the object, and coordinates of the at least two touch points are calculated, and wherein in the performing of the preprocessing, touch points that do not correspond to the time when the touch of the object is detected from among the at least two touch points are excluded.

12. The method of claim 11, wherein in the determining of the information of the touch of the object, a double click is determined by calculating a time interval and a space interval of the at least two touch points after performing the preprocessing.

13. An apparatus for recognizing a touch of an object on a display device comprising optical sensors, the apparatus comprising:

a touch sensing unit for sensing a touch of an object detected by a contact-detecting unit in the display device;

a touch determining unit for controlling output of a sensor scan signal for driving the optical sensors when the touch of the object is detected;

a touch point detecting unit for generating an image of the touch of the object corresponding to sensor signals sensed by the optical sensors, and for detecting touch points corresponding to the image of the touch of the object; and

an action recognition unit for determining information of the touch of the object based on the detected touch points.

14. The apparatus of claim 13, wherein the touch determining unit is configured to determine whether a signal output from the touch sensing unit is greater than a value, and to control the sensor scan signal to be output when the signal output from the touch sensing unit is greater than the value.

15. The apparatus of claim 14, wherein when the touch of the object is a double click, the touch point detecting unit is configured to detect two touch points in the image of the touch of the object, and to calculate coordinates of the two touch points, and the action recognition unit is configured to determine that the touch is a double click by calculating a time interval and a space interval between the two touch points.

16. The apparatus of claim 15, wherein the action recognition unit comprises:

a time determining unit for determining whether the time interval is smaller than a first value;

a position determining unit for determining whether the space interval is smaller than a second value; and

a double-click determining unit for determining whether a touch is a double click based on the determining of the time determining unit and the position determining unit.

17. An apparatus for recognizing a touch of an object on a display device comprising optical sensors, the apparatus comprising:

a touch sensing unit for sensing a touch of an object detected by a contact-detecting unit in the display device;

a touch point detecting unit for generating an image of the touch of the object corresponding to sensor signals sensed by the optical sensors, and for detecting touch points corresponding to the image of the touch of the object;

a preprocessing unit for performing preprocessing of the detected touch points corresponding to the detecting of the touch of the object; and

an action recognition unit for determining information of the touch of the object based on the touch points after performing the preprocessing.

18. The apparatus of claim 17, wherein the preprocessing unit is configured to exclude some of the detected touch points based on a time when the touch of the object is detected.