Touch panel apparatus and method for controlling the same

• US 7,248,249 B2
• Filed: 09/26/2003
• Issued: 07/24/2007
• Est. Priority Date: 11/13/2002
• Status: Expired due to Fees

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Lee, Chun Suck, Kong, Nam Young
• Primary Examiner(s): Shalwala; Bipin
• Assistant Examiner(s): Kovalick; Vincent E.
• Application Number:
  US10/670,739
• Publication Number:
  US 20040090431A1
• Time in Patent Office: 1,397 Days
• Field of Search: 345/156, 345/173, 345/174, 345/177, 178/18.01, 178/18.03, 178/18.1, 178/19.04, 338/47, 341/34
• US Class Current: 345/173
• CPC Class Codes: G06F 3/04186 Touch location disambiguation
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A touch panel apparatus includes a touch panel for recognizing a contact position and a touch panel controller for computing a coordinate value corresponding to the contact position on the touch panel, wherein an activation force is set to a value between 80 g˜150 g, and the touch panel controller compensates for an error of the coordinate value due to double touching of the touch panel.

Claims

1. A touch panel apparatus, comprising:

a touch panel for recognizing a contact position; and

a touch panel controller for computing a coordinate value corresponding to the contact position on the touch panel,

wherein an activation force is set to a value between 80 g-150 g, and the touch panel controller compensates for an error of the coordinate value due to double touching of the touch panel,

wherein a touch area of the touch panel is partitioned into a first region and a second region, and the activation force is set to the value between 80 g-150 g within the first region of the touch area of the touch panel.

2. The touch panel apparatus of claim 1 wherein the activation force is set to the value between 80 g-150 g within an entire touch area of the touch panel.

3. A touch panel apparatus, comprising:

a touch panel for recognizing a contact position; and

a touch panel controller for computing a coordinate value corresponding to the contact position on the touch panel,

wherein an activation force is set to a value between 80 g-150 g, and the touch panel controller compensates for an error of the coordinate value due to double touching of the touch panel,

wherein the touch panel controller computes a first coordinate value for a first touch generated in the touch panel, and

the touch panel controller computes a second coordinate value corresponding to a second touch and determines whether there is an error in the second coordinate value due to a double touching by comparing the second coordinate value to a preset reference coordinate value when an input signal corresponding to the second touch is received within a predefined time period.

4. The touch panel apparatus of claim 3, wherein the touch panel controller determines the second coordinate value to be erroneous when the second coordinate value exceeds the preset reference coordinate value.

5. The touch panel apparatus of claim 4, wherein the reference coordinate value is determined between a middle value and a location value corresponding to a real touch point, and the middle value is between the real touch point and the hand touch point upon double touching.

6. The touch panel apparatus of claim 3, wherein the touch panel controller compensates the second coordinate value in accordance with a difference value from the first coordinate value when an error in the second coordinate value due to a double touching is detected.

7. The touch panel apparatus of claim 6, wherein the touch panel controller compensates the second coordinate value by subtracting the difference value from the second coordinate value.

8. The touch panel apparatus according to claim 6, wherein the touch panel controller compensates the second coordinate value by adding the difference value to the second coordinate value.

9. A touch panel apparatus, comprising:

a touch panel for recognizing a contact position on the touch panel; and

a touch panel controller for computing a coordinate value corresponding to the contact position on the touch panel,

wherein an activation force is set to a value between 80 g-150 g, and the touch panel rejects one of a plurality of coordinate values when double touching generates the plurality of coordinate values,

wherein a touch area of the touch panel is partitioned into a first region and a second region, and the activation force is set to the value between 80 g-150 g within the first region of the touch area of the touch panel.

10. The touch panel apparatus of claim 9, wherein the activation force is set to the value between 80 g-150 g within an entire touch area of the touch panel.

11. A touch panel apparatus, comprising:

a touch panel for recognizing a contact position on the touch panel; and

a touch panel controller for computing a coordinate value corresponding to the contact position on the touch panel,

wherein an activation force is set to a value between 80 g-150 g, and the touch panel rejects one of a plurality of coordinate values when double touching generates the plurality of coordinate values,

wherein the touch panel controller computes a first coordinate value for a first touch generated in the touch panel, and the touch panel controller computes a second coordinate value corresponding to a second touch, and determines whether there is an error in the second coordinate value due to a double touching by comparing the second coordinate value to a preset reference coordinate value when an input signal corresponding to the second touch is received within a predefined time period.

12. The touch panel apparatus of claim 11, wherein the touch panel controller determines the second coordinate value to be erroneous when the second coordinate value exceeds the preset reference coordinate value.

13. The touch panel apparatus of claim 11, wherein the reference coordinate value is determined between a middle value and a location value corresponding to a real touch point, and the middle value is between the real touch point and the hand touch point upon double touching.

14. The touch panel apparatus of claim 12, wherein the touch panel controller rejects the second coordinate value when the second coordinate value is determined to be erroneous.

15. A method for controlling a touch panel apparatus comprising the steps of:

specifying a value for an activation force to be used as a reference for recognizing when the touch panel is touched at a touching position;

computing a first coordinate value for a first touch generated in the touch panel and computing a second coordinate value corresponding to a second touch when an input signal corresponding to the second touch is received within a predefined time period;

generating a preset reference coordinate value;

determining whether there is an error in the second coordinate value due to a double touching by comparing the second coordinate value to the preset reference coordinate value; and

compensating the error of the second coordinate value due to double touching of the touch panel.

16. The method of claim 15, wherein the step of determining includes determining the second coordinate value to be erroneous when the second coordinate value exceeds the preset reference coordinate value.

17. The method of claim 15, wherein the reference coordinate value is determined between a middle value and a location value corresponding to a real touch point, and the middle value is between the real touch point and the hand touch point upon double touching.

18. The method of claim 15, wherein the step of compensating the error of the coordinate value further includes compensating the second coordinate value in accordance with a difference value from the first coordinate value when there is an error in the second coordinate value due to a double touching.

19. The method of claim 18, wherein the step of compensating the error of the coordinate value further includes subtracting the difference value from the second coordinate value, thereby compensating the second coordinate value.

20. The method of claim 18, wherein the step of compensating the error of the coordinate value further includes adding the difference value to the second coordinate value, thereby compensating the second coordinate value.

21. A method for controlling a touch panel apparatus, comprising the steps of:

specifying a value for an activation force to be used as a reference for recognizing when the touch panel is touched at a touching position on the touch panel;

computing a coordinate value corresponding to the touching position on the touch panel, including computing a first coordinate value for a first touch generated in the touch panel and computing a second coordinate value corresponding to a second touch when an input signal corresponding to the second touch is received within a predefined time period; and

generating a preset reference coordinate value; and

determining whether there is an error in the second coordinate value due to a double touching by comparing the second coordinate value to the preset reference coordinate value

rejecting one of a plurality of coordinate values when double touching of the panel generates the plurality of coordinate values.

22. The method of claim 21, wherein the step of determining includes determining the second coordinate value to be erroneous when the second coordinate value exceeds the preset reference coordinate value.

23. The method of claim 22, wherein the second coordinate value is the coordinate value rejected in the step of rejecting when there is an error in the second coordinate value due to a double touching.

24. The method of claim 21, wherein the reference coordinate value is determined between a middle value and a location value corresponding to a real touch point, and wherein the middle value is between the real touch point and the hand touch point upon double touching.