Touch screen panel

• US 8,947,368 B2
• Filed: 08/18/2009
• Issued: 02/03/2015
• Est. Priority Date: 01/16/2009
• Status: Expired due to Fees

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Jeong, Hwan-Hee, Jung, Tae-Hyeog, Kang, Sung-Ku, Park, Jung-Mok, Lee, Choon-Hyop, Kim, Shawn, Kim, Sang-Kook
• Primary Examiner(s): MARINELLI, PATRICK
• Application Number:
  US12/543,409
• Publication Number:
  US 20100182252A1
• Time in Patent Office: 1,995 Days
• Field of Search: 345156-184, 345/104, 178 1801- 2004
• US Class Current: 345/173
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/13363 Birefringent elements, e.g. for optical compensation
• CPC Class Codes: G02F 1/133633 using mesogenic materials
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• 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 includes a transparent substrate; a plurality of first sensing patterns at a first side of the transparent substrate and coupled to each other along a first direction; a plurality of second sensing patterns at the first side of the transparent substrate and coupled to each other along a second direction, the second sensing patterns being alternately arranged with the first sensing patterns not to overlap with the first sensing patterns; and a phase difference compensating layer at the first side of the transparent substrate and adapted to compensate for a birefringence phase difference of a liquid crystal layer in a liquid crystal display panel at a second side of the transparent substrate.

Claims

1. A touch screen panel comprising:

a transparent substrate;

a plurality of first sensing patterns at a first side of the transparent substrate and coupled to each other along a first direction;

a plurality of second sensing patterns at the first side of the transparent substrate and coupled to each other along a second direction, the second sensing patterns being alternately arranged with the first sensing patterns not to overlap with the first sensing patterns;

an insulating layer on the second sensing patterns and spaced from the first sensing patterns;

a phase difference compensating layer comprising a transparent liquid crystal material at the first side of the transparent substrate and controlled to compensate for a birefringence phase difference of a liquid crystal layer in a liquid crystal display panel at a second side of the transparent substrate;

a color filter layer between the phase difference compensating layer and the liquid crystal layer, the color filter layer comprising a red layer, a green layer, and a blue layer;

a transparent ground electrode on the second side of the transparent substrate; and

an insulating film on the second side of the transparent substrate and covering the transparent ground electrode,

wherein at least some of the plurality of second sensing patterns are in the phase difference compensating layer, and

wherein the phase difference compensating layer is formed using a liquid crystal injection or coating method.

2. The touch screen panel as claimed in claim 1, wherein the phase difference compensating layer is between the first sensing patterns and the second sensing patterns and made of a material having a same birefringence property as the liquid crystal layer in the liquid crystal display panel.

3. The touch screen panel as claimed in claim 2, wherein the liquid crystal layer in the liquid crystal display panel and the phase difference compensating layer are formed of liquid crystal molecules in a same mode.

4. The touch screen panel as claimed in claim 1, further comprising:

a polarizer on the insulating layer; and

a window on the polarizer.

5. The touch screen panel as claimed in claim 4, wherein the window comprises a sheet made of a polymer material.

6. The touch screen panel as claimed in claim 1,

wherein a group of the first sensing patterns having a same X-coordinate in one column are coupled to each other,

wherein a group of the second sensing patterns having a same Y-coordinate in one row are coupled to each other, and

wherein the touch screen panel further comprises a plurality of metal patterns, the plurality of metal patterns being located at edge regions of the regions where the first and second sensing patterns are formed to electrically couple the sensing patterns in said column and/or row to position detecting lines.

7. A flat panel display device comprising:

a liquid crystal display panel comprising a liquid crystal layer and a color filter layer, the color filter layer comprising a red layer, a green layer, and a blue layer; and

a touch screen panel on the liquid crystal display panel, wherein the touch screen panel comprises;

a transparent substrate;

a plurality of first sensing patterns at a first side of the transparent substrate;

a plurality of second sensing patterns at the first side of the transparent substrate;

an insulating layer on the second sensing patterns and spaced from the first sensing patterns;

a phase difference compensating layer comprising a transparent liquid crystal material adjacent the first and second sensing patterns and controlled to compensate for a birefringence phase difference of the liquid crystal layer at a second side of the transparent substrate;

a transparent ground electrode on the second side of the transparent substrate; and

an insulating film on the second side of the transparent substrate and covering the transparent ground electrode,

wherein at least some of the plurality of second sensing patterns are in the phase difference compensating layer, and

wherein the phase difference compensating layer is formed using a liquid crystal injection or coating method.

8. The flat panel display device as claimed in claim 7, wherein the phase difference compensating layer comprises a material having a same birefringence property as the liquid crystal layer.

9. The flat panel display device as claimed in claim 8, wherein the liquid crystal layer and the phase difference compensating layer comprise liquid crystal molecules in a same mode.