CHARACTER INPUT METHOD AND APPARATUS IN PORTABLE TERMINAL HAVING TOUCH SCREEN

• US 20090140995A1
• Filed: 11/24/2008
• Published: 06/04/2009
• Est. Priority Date: 11/23/2007
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kang, Hee-Jun
• Granted Patent: US 8,558,800 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0236 using selection techniques to select from displayed items
• CPC Class Codes: G06F 3/0482 Interaction with lists of selectable items, e.g. menus
• CPC Class Codes: G06F 3/04842 Selection of displayed objects or displayed text elements G06F3/0482 takes precedence
• CPC Class Codes: G06F 3/0486 Drag-and-drop
• CPC Class Codes: G06F 3/04883 for inputting data by handwriting, e.g. gesture or text
• CPC Class Codes: G06F 3/04886 by partitioning the display area of the touch-screen or the surface of the digitising tablet into independently controllable areas, e.g. virtual keyboards or menus

Abstract

A character input method and apparatus in a portable terminal having a touch screen using a virtual keypad in which a plurality of characters is allocated to each of at least one key area is provided. The character input method includes displaying, in a character input mode, a virtual keypad having at least one key area to which a plurality of characters is allocated, displaying a plurality of divided areas in a region surrounding the touched key area, if a touch is generated in one of the key areas of the virtual keypad, determining whether a drag is generated from the touch, and if a drag is generated, displaying a character mapped to the divided area in a point where the drag is released.

Claims

1. A character input method in a portable terminal having a touch screen, comprising:

displaying, in a character input mode, a virtual keypad having at least one key area to which a plurality of characters is allocated;

displaying, if a touch is generated in one of the key areas of the virtual keypad, a plurality of divided areas in a region surrounding the touched key area;

determining whether a drag is generated from the touch; and

displaying, if a drag is generated, a character mapped to the divided area in a point where the drag is released.

2. The method according to claim 1, wherein displaying the virtual keypad further comprises changing a layout of the virtual keypad and the quantity of characters allocated to one key area according to characters.

3. The method according to claim 1, wherein displaying a virtual keypad further comprises displaying a character input window for displaying the character mapped to the divided area in which the drag release point is located.

4. The method according to claim 1, wherein a sum of the plurality of the divided areas is equivalent to a number of the characters allocated to the touched key area.

5. The method according to claim 1, wherein the displayed divided areas are distinguished using at least one of lines and colors.

6. The method according to claim 1, further comprising displaying, if the touch is maintained for a predetermined time without a drag being generated, a numeral allocated to the touched key area.

7. The method according to claim 1, wherein the divided areas include a plurality of concentric circles arranged around the touched key area.

8. The method according to claim 7, wherein displaying the character further comprises:

determining the length of the drag from a point where the touch is generated to the point where the drag is released;

identifying a concentric circle corresponding to the point where the drag is released by comparing a radius of each concentric circle with the length of the drag;

determining a character mapped to the concentric circle corresponding to the point where the drag is released; and

displaying the character mapped to the concentric circle corresponding to the point where the drag is released.

9. A character input apparatus comprising:

a touch screen for detecting a touch and a drag; and

a controller for displaying on the touch screen in a character input mode, a virtual keypad having at least one key area to which a plurality of characters is allocated, a plurality of divided areas in a region surrounding the touched key area if a touch is generated in one key area of the virtual keypad, and a character mapped to the divided area in a point where the drag is released, if a drag is generated from the touch.

10. The apparatus according to claim 9, wherein the touch screen comprises a character input window for displaying the mapped character.

11. The apparatus according to claim 9, wherein a sum of the plurality of the divided areas is equivalent to a number of the characters allocated to the touched key area of the virtual keypad.

12. The apparatus according to claim 9, wherein the controller displays the divided areas as a plurality of concentric circles arranged around the touched key area.

13. The apparatus according to claim 9, further comprising a storage unit for storing mapping information about the characters allocated to the key areas and to the divided areas.

14. The apparatus according to claim 12, wherein if a drag is generated, the controller determines the length of the drag and compares the length with a radius of each concentric circle to identify the concentric circle corresponding to the point of drag release.