Touch input device, portable device using the same and method of controlling the same

• US 20100123667A1
• Filed: 01/14/2009
• Published: 05/20/2010
• Est. Priority Date: 11/14/2008
• Status: Abandoned Application

• Current Assignee: Korea Research Institute of Standards and Science
• Original Assignee: Korea Research Institute of Standards and Science
• Inventors: Choi, Jae-Hyuk, Kim, Jong Ho, Kim, Min Seok, Park, Yon-Kyu, Kang, Dae Im
• Application Number:
  US12/319,958
• Publication Number:
  US 20100123667A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

Provided are a touch input device capable of acquiring information on whether a pointing object touches a touch panel, information on a touch point of the pointing object touching the touch panel and information on the magnitude of touch force of the pointing object and a method of controlling the same. The touch input device includes a touch panel having a plurality of electrically separated upper electrode strips formed on one side thereof and touched by a pointing object, a first switch electrically connecting the plurality of upper electrode strips to form a single electrode or two electrodes, and an information generator generating at least one of information on a touch point of the pointing object and information on the magnitude of touch force of the pointing object and information on whether the pointing object approaches the touch panel on the basis of a signal received from the touch panel according to a switched state of the first switch.

Claims

1. A touch input device comprising:

a touch panel having a plurality of electrically separated upper electrode strips formed on one side thereof and touched by a pointing object;

a first switch electrically connecting the plurality of upper electrode strips to form a single electrode or two electrodes; and

an information generator generating at least one of information on a touch point of the pointing object and information on the magnitude of touch force of the pointing object and information on whether the pointing object approaches the touch panel on the basis of a signal received from the touch panel according to a switched state of the first switch.

2. The touch input device according to claim 1, wherein the touch panel corresponds to an array type contact resistance touch panel or an array type capacitance touch panel.

3. The touch input device according to claim 1, wherein the information generator comprises:

a position information unit receiving a signal with respect to the touch point of the pointing object from the touch panel to acquire the information on the touch point of the pointing object;

a magnitude information unit receiving a signal with respect to the touch force of the pointing object from the touch panel to acquire the information on the magnitude of touch force of the pointing object; and

a proximity information unit receiving a signal with respect to a capacitance variation according to proximity of the pointing object from the touch panel to acquire the information on whether the pointing object approaches the touch panel.

4. The touch input device according to claim 3, wherein the proximity information unit determines whether the pointing object approaches the touch panel based on a proximity threshold value corresponding to a predetermined capacitance variation.

5. The touch input device according to claim 3, wherein the magnitude information unit receives a signal with respect to a variation in the capacitance between the upper electrode strips and the pointing object and calculates the magnitude of touch force according to the capacitance or searches for predetermined data to acquire the magnitude of touch force of the pointing object.

6. The touch input device according to claim 3, wherein the information generator selectively activates the position information unit, the magnitude information unit and the proximity information unit.

7. The touch input device according to claim 1, wherein the first switch is switched based on the information on whether the pointing object approaches the touch panel, acquired by the information generator.

8. The touch input device according to claim 1, further comprising a plurality of electrically separated lower electrode strips formed on the other side of the touch panel and a second switch electrically connecting the plurality of lower electrode strips to form a single electrode.

9. The touch input device according to claim 8, wherein the second switch is switched to form the single electrode when the first switch is switched to form the two electrodes.

10. The touch input device according to claim 1, wherein the pointing device corresponds to a part of the human body.

11. A mobile apparatus comprising:

a touch panel having a plurality of electrically separated upper electrode strips formed on one side thereof and touched by a pointing object;

a first switch electrically connecting the plurality of upper electrode strips to form a single electrode or two electrodes;

an information generator generating at least one of information on a touch point of the pointing object and information on the magnitude of touch force of the pointing object and information on whether the pointing object approaches the touch panel on the basis of a signal received from the touch panel according to a switched state of the first switch; and

a display located under the touch panel to provide a screen to a user.

12. The mobile apparatus according to claim 11, further comprising a plurality of electrically separated lower electrode strips formed on the other side of the touch panel and a second switch electrically connecting the plurality of lower electrode strips to form a single electrode.

13. The mobile apparatus according to claim 11, wherein the display is operated when the information generator generates the information on whether the pointing object approaches the touch panel.

14. A method of controlling a touch input device, comprising the steps of:

switching a first switch to electrically connect a plurality of upper electrode strips to form two electrodes;

sensing a variation in capacitance between the two electrodes, which is caused by a pointing object;

switching the first switch to electrically connect the plurality of upper electrode strips to form a single electrode when the pointing object touches a touch panel;

acquiring the magnitude of touch force of the pointing object based on a capacitance variation between the single electrode and the pointing object;

switching the first switch such that the plurality of upper electrode strips respectively function as individual electrodes; and

acquiring information on the touch point of the pointing object according to the individual electrodes.

15. The method according to claim 14, further comprising the step of switching a second switch to electrically connect a plurality of lower electrode strips to form a single electrode between the step of switching the first switch to form the two electrodes and the step of sensing the capacitance variation, and the step of switching the second switch such that the plurality of lower electrode strips respectively function as individual electrodes between the step of switching the first switch such that the plurality of upper electrode strips respectively function as the individual electrodes and the step of acquiring the information on the touch point of the pointing object.

16. The method according to claim 14, wherein the step of sensing the capacitance variation between the two electrodes is repeated when the pointing object does not touch the touch panel.

17. The method according to claim 14, wherein the step of sensing the capacitance variation between the two electrodes determines whether the pointing object approaches the touch panel based on a predetermined proximity threshold value.

18. The method according to claim 14, wherein the step of sensing the capacitance variation between the two electrodes comprises the step of activating a display of the touch input device when a capacitance variation that exceeds the proximity threshold value is sensed.

19. The method according to claim 14, wherein the step of acquiring the information on the magnitude of touch force of the pointing object obtains the magnitude of touch force using at least one of a method of calculating the magnitude of touch force of the pointing object and a method of searching for previously stored magnitude information on the basis of a signal with respect to the capacitance variation between the single electrode and the pointing object.