Touch screen panel and method of fabricating the same

• US 8,279,201 B2
• Filed: 05/12/2009
• Issued: 10/02/2012
• Est. Priority Date: 07/11/2008
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Group)
• Original Assignee: Samsung Display Company Limited (Samsung Group)
• Inventors: Kang, Sung-Ku, Jung, Tae-Hyeog, Kim, Jin-Guen, Kim, Gi-Min
• Primary Examiner(s): Shankar, Vijay
• Application Number:
  US12/464,603
• Publication Number:
  US 20100007621A1
• Time in Patent Office: 1,239 Days
• Field of Search: 345173-180, 178 1801- 1807, 178 2001- 2004
• US Class Current: 345/176
• 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

A touch screen panel having an improved reflectance difference between sensing patterns. The touch screen panel includes a transparent substrate; a plurality of first sensing patterns on the transparent substrate and connected along a first direction; a first insulating layer on the first sensing patterns; and a plurality of second sensing patterns on the first insulating layer and connected along a second direction. The second sensing patterns are alternately disposed with the first sensing patterns and not overlapped with the first sensing patterns. The touch screen panel further includes a plurality of dummy patterns in at least one of first dummy regions between the first sensing patterns and second dummy regions between the second sensing patterns.

Claims

1. A touch screen panel comprising:

a transparent substrate;

a plurality of first sensing patterns on the transparent substrate and connected to each other along a first direction;

a first insulating layer on the first sensing patterns;

a plurality of second sensing patterns on the first insulating layer and connected to each other along a second direction, the second sensing patterns being alternately disposed with the first sensing patterns and not overlapped with the first sensing patterns; and

a plurality of dummy patterns in at least one of first dummy regions between the first sensing patterns or second dummy regions between the second sensing patterns,

wherein each of the first sensing patterns has at least three sides, and a corresponding one of the plurality of dummy patterns is located adjacent to each one of the at least three sides.

2. The touch screen panel as claimed in claim 1, wherein the dummy patterns are formed of the same material as the first sensing patterns on the transparent substrate, and are beneath the second sensing patterns and overlap with the second sensing patterns.

3. The touch screen panel as claimed in claim 1, wherein the dummy patterns are formed of the same material as the second sensing patterns on the first insulating layer, and are on the first sensing patterns and overlap with the first sensing patterns.

4. The touch screen panel as claimed in claim 1, wherein the dummy patterns are separated from each other.

5. The touch screen panel as claimed in claim 1, wherein the dummy patterns comprise a plurality of first dummy patterns on the transparent substrate in the first regions between the first sensing patterns, and a plurality of second dummy patterns on the first insulating layer in the second dummy regions between the second sensing patterns.

6. The touch screen panel as claimed in claim 5, wherein:

the first dummy patterns overlap with the second sensing patterns, and the second dummy patterns overlap with the first sensing patterns;

the first dummy patterns and the second dummy patterns alternately on the transparent substrate and the first insulating layer; and

portions of edge regions of the first dummy patterns and the second dummy patterns overlap with each other.

7. The touch screen panel as claimed in claim 1, wherein the first sensing patterns, the second sensing patterns and the dummy patterns comprise a transparent electrode material.

8. The touch screen panel as claimed in claim 1, wherein:

first sensing patterns of the plurality of first sensing patterns having the same X-coordinate are connected together in a column, and second sensing patterns of the plurality of second sensing patterns having the same Y-coordinate are connected together in a row; and

the touch screen panel further comprises a plurality of metal patterns at an edge region for electrically connecting the first sensing patterns and the second sensing patterns on the column or the row, respectively, to position detecting lines.

9. The touch screen panel as claimed in claim 1, further comprising at least one of a second insulating layer on the second sensing patterns, a transparent ground electrode or a third insulating layer, the transparent ground electrode and/or the third insulating layer being on a surface of the transparent substrate opposite to another surface on which the first sensing patterns are located.

13. The touch screen panel as claimed in claim 1, wherein two adjacent sensing patterns of the plurality of first sensing patterns are connected to each other by an elongated portion extending in the first direction, the elongated portion having a width that is narrower than that of the two adjacent sensing patterns.

14. The touch screen panel as claimed in claim 1, wherein two adjacent sensing patterns of the plurality of second sensing patterns are connected to each other by an elongated portion extending in the second direction, the elongated portion having a width that is narrower than that of the two adjacent sensing patterns.

10. A method of fabricating a touch screen panel, the method comprising:

forming a plurality of first sensing patterns on a transparent substrate, the plurality of first sensing patterns connected to each other along a first direction;

forming a first insulating layer on the first sensing patterns;

forming a plurality of second sensing patterns on the first insulating layer, the plurality of second sensing patterns connected to each other along a second direction, the second sensing patterns being alternately disposed with the first sensing patterns and not overlapped with the first sensing patterns; and

forming a plurality of dummy patterns in at least one of first dummy regions between the first sensing patterns or second dummy regions between the second sensing patterns,

wherein each of the first sensing patterns has at least three sides, and a corresponding one of the plurality of dummy patterns is located adjacent to each one of the at least three sides.

11. The method as claimed in claim 10, wherein the dummy patterns comprise first dummy patterns in the first dummy regions between the first sensing patterns on the transparent substrate and second dummy patterns in the second dummy regions between the second sensing patterns on the first insulating layer, and the first dummy patterns and the second dummy patterns are alternately on the respective transparent substrate and the first insulating layer, and

portions of edge regions of the first dummy patterns and the second dummy patterns overlap with each other.

12. The method as claimed in claim 10, further comprising forming a second insulating layer on the second sensing patterns.