METHOD OF POSITIONING COORDINATE

• US 20100271317A1
• Filed: 08/17/2009
• Published: 10/28/2010
• Est. Priority Date: 04/27/2009
• Status: Active Grant

• Current Assignee: Chunghwa Picture Tubes Limited (Tatung Co., Ltd.)
• Original Assignee: Chunghwa Picture Tubes Limited (Tatung Co., Ltd.)
• Inventors: Liu, Chia-Lin, Chen, Chih-Chung, Hsieh, Ming-Ta, Yin, Hsueh-Fang, Lin, Chien-Ming
• Granted Patent: US 8,120,593 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/04883 for inputting data by handwriting, e.g. gesture or text

Abstract

A method of positioning a coordinate suitable for a touch panel includes following steps. When a touch event occurs, the touch panel generates a corresponding detection coordinate periodically until the touch event ends. When the touch event occurs, the detection coordinate generated by the touch panel is sequentially stored. The touch event is ignored until the number of coordinates generated by the touch panel is greater than or equal to N, and N is a positive integer. When the number of coordinates generated by the touch panel is greater than or equal to N, a touch coordinate corresponding to the touch event is generated according to the last generated N detection coordinates. The above-mentioned step of generating the touch coordinate is repeated according to a cycle of generating the detection coordinate by the touch panel so as to renew the touch coordinate until the touch event ends.

Claims

1. A method of positioning a coordinate, the method being suitable for a touch panel, wherein when a touch event occurs, the touch panel generates a corresponding detection coordinate periodically until the touch event ends, the method comprising:

sequentially storing the detection coordinate generated by the touch panel when the touch event occurs;

ignoring the touch event until the number of coordinate generated by the touch panel is greater than or equal to N, wherein N is a positive integer;

generating a touch coordinate corresponding to the touch event according to the last generated N detection coordinates when the number of coordinates generated by the touch panel is greater than or equal to N; and

repeating the step of generating the touch coordinate according to a cycle of generating the detection coordinate by the touch panel, such that the touch coordinate is renewed until the touch event ends.

2. The method of positioning the coordinate as claimed in claim 1, the step of generating the touch coordinate according to the last generated N detection coordinates comprising:

generating the touch coordinate according to an average of a maximum detection coordinate and a minimum detection coordinate from an (i-N+1)^th detection coordinate to an i^th detection coordinate when the i^th detection coordinate is generated by the touch panel, wherein i is a positive integer, and i is greater than or equal to N.

3. The method of positioning the coordinate as claimed in claim 2, the step of renewing the touch coordinate further comprising:

if an (i+1)^th detection coordinate exceeds a range from the (i-N+1)^th detection coordinate to the i^th detection coordinate, renewing the touch coordinate according to an average of a maximum detection coordinate and a minimum detection coordinate from an (i-N+2)^th detection coordinate to the (i+1)^th detection coordinate when the (i+1)^th detection coordinate is generated by the touch panel; and

if the (i+1)^th detection coordinate falls within the range from the (i-N+1)^th detection coordinate to the i^th detection coordinate, keeping the touch coordinate unchanged.

4. The method of positioning the coordinate as claimed in claim 1, the step of generating the touch coordinate according to the last generated N detection coordinates comprising:

obtaining a remainder by subtracting a maximum detection coordinate and a minimum detection coordinate among the N detection coordinates from a total sum of the last generated N detection coordinates and obtaining the touch coordinate by dividing the remainder by (N−

2).

5. The method of positioning the coordinate as claimed in claim 1, wherein N is equal to 4.

6. The method of positioning the coordinate as claimed in claim 1, wherein the touch event is triggered by an input tool touching the touch panel.

7. The method of positioning the coordinate as claimed in claim 6, wherein the input tool comprises a finger or a stylus.