Touch panel input coordinate transform device and method of transforming a touch panel input coordinate

• US 6,686,909 B1
• Filed: 11/21/2000
• Issued: 02/03/2004
• Est. Priority Date: 11/22/1999
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Endo, Kazuo
• Primary Examiner(s): Shalwala, Bipin
• Assistant Examiner(s): LEWIS, DAVID LEE
• Application Number:
  US09/716,455
• Time in Patent Office: 1,169 Days
• Field of Search: 345/169, 345/649, 345/650, 345/654, 345/665, 345/656, 345/173-178, 235/472, 178/18-1-
• US Class Current: 345/173
• CPC Class Codes: G06F 1/1601 Constructional details related to the housing of computer displays, e.g. of CRT monitors, of flat displays constructional details related to flat displays integrated in a portable computer, e.g. laptop, handheld computer G06F1/1637; constructional details related to television receivers H04N5/64
• CPC Class Codes: G06F 2200/1614 Image rotation following screen orientation, e.g. switching from landscape to portrait mode
• CPC Class Codes: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures
• CPC Class Codes: G09G 2340/0492 Change of orientation of the displayed image, e.g. upside-down, mirrored

Abstract

A touch panel input coordinate transform device is provided which detects coordinate data supplied to a touch panel and transforms the coordinate data according to a rotation angle by which images on the display unit are rotated. Further, decision is made about the rotation angle of the images either at the time point when an origin is registered or at the time point when an operator touches the touch panel.

Claims

1. A touch panel input coordinate transform device comprising:

an origin register unit which registers information of an origin of a touch panel as origin information;

a first storage unit which stores first rotation information based on images displayed on a display, when the origin of the touch panel is registered;

a first transform unit which transforms physical coordinates touched on the touch panel into first logical coordinates using the origin information;

a rotation control module which rotates the images;

a second storage unit which stores second rotation information based on the images currently displayed on the display;

a comparison unit which compares the first rotation information with the second rotation information when a touch operation is performed onto the touch panel, and determines a difference between the first rotation information and the second rotation information; and

a second transform unit which transforms the first logical coordinates into second logical coordinates, on the basis of the difference, when the contents of the first rotation information are different from the contents of the second rotation information, and which supplies the second logical coordinates to an input control unit.

2. The touch panel input coordinate transform device of claim 1 further comprising an update unit which detects rotation information on the image currently displayed on the display when the images are rotated on the display, and updates the contents of the second rotation information in the second storage unit with the detected rotation information.

3. The touch panel input coordinate transform device of claim 1, wherein each of the contents of the first rotation information and the contents of the second rotation information includes a rotation angle for rotating images displayed on the display.

10. The touch panel input coordinate transform device of claim 3, wherein each of the first rotation information and the second rotation information includes a rotation angle for rotating images displayed on the display.

4. A method of transforming a touch panel input coordinate comprising:

registering, in an origin register unit, information of an origin of a touch panel as origin information;

storing, in a first storage unit, first rotation information based on images displayed on a display when the origin of the touch panel is registered;

transforming physical coordinates touched on the touch panel into first logical coordinates using the origin information,

rotating the displayed images;

storing in a second storage unit second rotation information based on the images currently displayed on the display;

comparing the first rotation information with the second rotation information stored in the second storage unit when a touch operation is performed onto the touch panel, and determining a difference between the first rotation information and the second rotation information; and

transforming the first logical coordinates into second logical coordinates, on the basis of the difference, when the contents of the first rotation information are different from the contents of the second rotation information; and

supplying the second logical coordinates to an input control unit.

5. The method of transforming a touch panel input coordinate of claim 4, further comprising:

detecting rotation information on the image currently displayed on the display when the images are rotated on the display; and

updating the contents of the second rotation information in the second storage unit with the detected rotation information.

6. The method of transforming a touch panel input coordinate of claim 4, wherein each of the contents of the first rotation information and the contents of the second rotation information includes a rotation angle with which images displayed on the display are rotated.

7. A recording medium readable by a computer, embodying a program of instructions executable by the computer to perform a method of transforming a touch panel input coordinate comprising:

registering, in an origin register unit, information of an origin of a touch panel;

storing, in a first storage unit, first rotation information on images displayed on a display when the origin of the touch panel is registered;

transforming physical coordinates touched on the touch panel into first logical coordinates using the origin information;

storing in a second storage unit second rotation information based on the images currently displayed on the display;

comparing the first rotation information with the second rotation information when a touch operation is performed onto the touch panel, and determining a difference between the first rotation information and the second rotation information;

transforming the first logical coordinates into second logical coordinates, on the basis of the difference when the contents of the first rotation information is different from the contents of the second rotation information and

supplying the second logical coordinates to an input control unit.

8. A touch panel input coordinate transform device comprising:

means for registering an origin of a touch panel as origin information;

means for storing first rotation information based on an image displayed on a display when the origin of a touch panel is registered;

means for transforming physical coordinates touched on the touch panel into first logical coordinates using the origin information;

means for rotating the image;

means for storing second rotation information based on the image currently displayed on the display;

means for comparing said first rotation information with said second rotation information, when a touch operation is performed to the touch panel, and for determining a difference between said first rotation information and said second rotation information; and

means for transforming, when the first rotation information is different from the second rotation information, the first logical coordinates into second logical coordinates on the basis of the difference; and

means for supplying the second logical coordinates to an input control unit.

9. The touch panel input coordinate transform device of claim 8, further comprising update means for detecting rotation information on the image currently displayed on the display when the images are rotated on the display, and updating the contents of the second rotation information with the detected rotation information.