Digital resistive-type touch panel

• US 7,348,966 B2
• Filed: 11/12/2003
• Issued: 03/25/2008
• Est. Priority Date: 11/20/2002
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Hong, Hee Jung, Park, Hee Jeong
• Primary Examiner(s): Wang; Jin-Cheng
• Application Number:
  US10/704,669
• Publication Number:
  US 20040095336A1
• Time in Patent Office: 1,595 Days
• Field of Search: 345156-173, 349/149
• US Class Current: 345/173
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A digital resistive-type touch panel includes first and second transparent substrates opposing each other; a plurality of first transparent electrodes extending along a surface of the first transparent substrate; a plurality of second transparent electrodes extending along a surface of the second transparent substrate, wherein the first and second transparent electrodes cross each other; a first signal line for dividing an applied voltage and applying unique voltages to respective ones of the first transparent electrodes; and a plurality of second signal lines connected to respective ones of the plurality of second transparent electrodes.

Claims

1. A digital resistive-type touch panel, comprising:

a first substrate having a first surface;

a second substrate having a second surface opposing the first surface;

a plurality of first transparent electrodes extending along a first direction on the first surface;

a plurality of second transparent electrodes extending along a second direction on the second surface, wherein the second direction is substantially perpendicular to the first direction;

a first signal line including;

a main line having a predetermined orientation with respect to the first direction; and

a plurality of supplementary lines, each supplementary line of the plurality in direct contact with a respective one of the plurality of first transparent electrodes and connected to the main line;

a plurality of second signal lines connected to respective ones of the plurality of second transparent electrodes, and

first and second power lines respectively connected to opposing ends of the main line,

wherein the main line divides a voltage from the first power line into unique voltages in accordance with an internal resistance value of the main line and supplies a respective one of the unique voltages to each of the plurality of the first transparent electrodes via a respective supplemental line of the plurality of supplemental lines, and

wherein only one of the second transparent electrodes outputs a voltage corresponding to a location of a contact point between the one of the second transparent electrodes and one of the first transparent electrodes.

2. The digital resistive-type touch panel of claim 1, wherein the plurality of supplementary lines are spaced apart from each other by a predetermined distance.

3. The digital resistive-type touch panel of claim 1, wherein the first and second power lines respectively connect a power source voltage and a ground voltage are to opposing ends of the main line.

4. The digital resistive-type touch panel of claim 3, wherein

the main line and the supplementary lines comprise a material having a first resistance value;

and

the first and second power lines comprise a material having a second resistance value, wherein the second resistance value is less than the first resistance value.

5. The digital resistive-type touch panel of claim 3, wherein the power lines comprise silver (Ag).

6. The digital resistive-type touch panel of claim 1, wherein the main line comprises Indium-Tin-Oxide (ITO).

7. The digital resistive-type touch panel of claim 1, wherein the plurality of supplementary lines comprise Indium-Tin-Oxide (ITO).

8. The digital resistive-type touch panel of claim 1, wherein the main line comprises a straight pattern.

9. The digital resistive-type touch panel of claim 1, wherein the main line comprises a tortuous pattern.

10. The digital resistive-type touch panel of claim 1, wherein the touch panel is integrated with a display device.

11. The digital resistive-type touch panel of claim 10, wherein the display device includes a cathode ray tube (CRT).

12. The digital resistive-type touch panel of claim 10, wherein the display device includes a plasma display panel (PDP).

13. The digital resistive-type touch panel of claim 10, wherein the display device includes an electro luminescent display (ELD).

14. The digital resistive-type touch panel of claim 10, wherein the display device includes a vacuum fluorescent display (VFD).

15. The digital resistive-type touch panel of claim 10, wherein the display device includes a liquid crystal display (LCD) device.

16. The digital resistive-type touch panel of claim 15, wherein the LCD device includes:

a plurality of data lines; and

a plurality of gate lines.

17. The digital resistive-type touch panel of claim 16, wherein

the plurality of first transparent electrodes are arranged substantially parallel to the plurality of data lines;

and

the plurality of second transparent electrodes are arranged substantially parallel to the plurality of gate lines.

18. The digital resistive-type touch panel of claim 10, wherein the first and second transparent electrodes have substantially the same width as that of each pixel of the display device.

19. The digital resistive-type touch panel of claim 18, wherein the width of the first and second transparent electrodes is substantially the same of each pixel of the display device.

20. The touch panel of claim 1, wherein X- and Y-axis coordinates of the contact point are determined from the voltage output from the one of second transparent electrodes that outputs the voltage.

21. A touch panel, comprising:

a first transparent electrode pattern comprising a plurality of first transparent electrodes extending along a first direction, and a lower line connected to the plurality of first transparent electrodes;

a plurality of second transparent electrodes extending along a second direction;

a first and second power lines respectively connected to opposing ends of the lower line; and

a plurality of second signal lines connected to the plurality of second transparent electrodes, wherein the lower line divides a voltage from the first power line into unique voltages in accordance with an internal resistance value of the lower line and supplies each of the unique voltages to a respective one of the plurality of the first transparent electrodes, and

wherein one of the second transparent electrodes outputs a voltage corresponding to a location of a contact point between the one of the second transparent electrodes and the first transparent electrode pattern.

22. The touch panel of claim 21, wherein the plurality of first transparent electrodes include the same material as the lower line.

23. The touch panel of claim 21, wherein X- and Y-axis coordinates of the contact point are determined from the voltage output from the one of second transparent electrodes that outputs the voltage.