Touch panel display apparatus and method of fabricating the same

• US 7,336,261 B2
• Filed: 12/24/2002
• Issued: 02/26/2008
• Est. Priority Date: 12/28/2001
• Status: Expired due to Term

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Yu, Hwan Seong
• Primary Examiner(s): LEWIS, DAVID LEE
• Application Number:
  US10/327,617
• Publication Number:
  US 20030122799A1
• Time in Patent Office: 1,890 Days
• Field of Search: 345173-178, 257/64, 428/323, 178 1801- 1811, 178 1901- 1907, 313/506, 349/12
• US Class Current: 345/173
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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 display apparatus includes an upper sheet having an upper transparent film formed of one of a crystalline transparent conductive material and an amorphous transparent conductive material, and a lower sheet having a lower transparent film formed of one of an other one of the crystalline transparent conductive material and the amorphous transparent conductive material.

Claims

1. A touch panel display apparatus, comprising:

a first sheet;

a first transparent film formed on the first sheet, wherein the first transparent film is transparent conductive material having one of a crystalline and an amorphous structure;

a second sheet;

a second transparent film formed on a surface of the second sheet facing the first transparent film, wherein the second transparent film is a transparent conductive material having the opposite one of a crystalline and an amorphous structure as the material used to form the first transparent film.

2. The apparatus according to claim 1, further comprising a liquid crystal display device positioned on a bottom surface of one of the first and second sheets.

3. The apparatus according to claim 1, wherein the first and second transparent films both include one of indium-tin-oxide, indium-zinc-oxide, and indium-tin-zinc-oxide.

4. The apparatus according to claim 1, further comprising an electrode layer formed along outer areas of the first and second sheets, and a spacer formed between the first and second transparent films for maintaining a specific gap therebetween.

5. A method of fabricating a touch panel display apparatus, comprising steps of:

forming a first sheet and a second sheet;

forming a first transparent conductive material having one of a crystalline and an amorphous structure on the first sheet to form a first transparent film; and

forming a second transparent conductive material having the opposite one of a crystalline and an amorphous structure as the material used to form the first transparent film on the second sheet to form a second transparent film.

6. The method according to claim 5, further comprising a step of positioning a liquid crystal display device at a bottom surface of the second sheet.

7. The method according to claim 5, wherein the crystalline structure is formed by a heat treatment applied to an amorphous transparent conductive material at a temperature below a melting point of the transparent conductive material.

8. The method according to claim 5, wherein the first and the second transparent films are formed of one of indium-tin-oxide, indium-zinc-oxide, and indium-tin-zinc-oxide.

9. The method according to claim 5, further comprising steps of forming an electrode layer along an outer area of the first and second sheets for supplying a voltage, and forming a spacer between the first and second transparent films for maintaining a specific gap therebetween.