Liquid crystal display with integrated touch screen panel

• US 8,743,063 B2
• Filed: 05/25/2011
• Issued: 06/03/2014
• Est. Priority Date: 10/29/2010
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Lee, Seung-Kyu, Park, Jin-Woo, Lee, Dong-Hoon, Kim, Chul-Ho, Lee, Joo-Hyung, Kim, Chi-Woo, Rho, Soo-Guy, Pak, Sang-Jin
• Primary Examiner(s): GIESY, ADAM
• Application Number:
  US13/115,869
• Publication Number:
  US 20120105381A1
• Time in Patent Office: 1,105 Days
• Field of Search: None
• US Class Current: 345/173
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• 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 liquid crystal display with an integrated touch screen panel is disclosed. According to some aspects, conductive patterns or conducting patterns provided to the LCD are used as driving electrodes of the touch screen panel. A driving electrode of the touch screen panel may be formed on one surface of a polarizing plate or window attached to the LCD so as to be positioned close to a contact point, thereby improving touch sensitivity.

Claims

1. A liquid crystal display (LCD) with an integrated touch screen panel, the LCD comprising:

a first substrate having a plurality of pixels formed thereon, wherein each of the plurality of pixels comprises a thin film transistor and a pixel electrode, the pixel electrode being connected to a drain electrode of the thin film transistor through a contact hole formed in a protective layer;

a second substrate positioned to face the first substrate, the second substrate having a plurality of common electrode patterns formed thereon, wherein the plurality of common electrode patterns are arranged in a first direction to respectively correspond to the pixel electrodes;

first and second polarizing plates respectively attached to outer surfaces of the first and second substrates;

a window attached to an outer surface of the second polarizing plate;

sensing electrodes formed on one surface of one of the second polarizing plate and window, wherein the sensing electrodes are and configured as a plurality of patterns arranged in a second direction, and wherein the second direction intersects the first direction, and wherein the second polarizing layer is positioned at least partially between the sensing electrodes and the second substrate; and

a liquid crystal layer formed between the first and second substrate.

2. The LCD according to claim 1, further comprising a back light positioned on a bottom surface of the first substrate to provide light.

3. The LCD according to claim 1, wherein the sensing electrodes are formed by attaching a film in which a transparent conductive material is patterned to the second polarizing plate or window.

4. The LCD according to claim 1, wherein the same voltage is applied to the common electrode patterns during a first frame period in which the LCD performs an operation of displaying a predetermined image, and a driving signal is sequentially applied to common electrode patterns during a second frame period in which the LCD performs an operation of recognizing a touch.

5. The LCD according to claim 4, wherein the first and second frame periods are sequentially and repeatedly operated.

6. An LCD with an integrated touch screen panel, the LCD comprising:

a first substrate having a plurality of pixels formed thereon, wherein the plurality of pixels are positioned between gate and storage lines arranged in a first direction and data lines arranged in a second direction, respectively, and each of the plurality of pixels comprises a thin film transistor and a pixel electrode, the pixel electrode being connected to a drain electrode of the thin film transistor through a contact hole formed in a protective layer;

a second substrate positioned to face the first substrate, the second substrate having color filter patterns arranged corresponding to the respective pixels and a common electrode formed on the color filter patterns;

first and second polarizing plates respectively attached to outer surfaces of the first and second substrates;

a window attached to an outer surface of the first polarizing plate;

sensing electrodes formed on one surface of one of the first polarizing plate or window, wherein the sensing electrodes are configured as a plurality of patterns arranged in the second direction, and wherein the first polarizing plate is positioned at least partially between the sensing electrodes and the first substrate; and

a liquid crystal layer formed between the first and second substrates,

wherein the gate or storage lines are used as driving electrodes which respectively correspond to the sensing electrodes.

7. The LCD according to claim 6, further comprising a back light positioned on a top surface of the second substrate to provide light.

8. The LCD according to claim 6, wherein the sensing electrodes are formed by attaching a film, and wherein the film includes a transparent conductive material patterned to the first polarizing plate or window.

9. The LCD according to claim 6, wherein a scan or sustain signal is applied to the respective gate or storage lines during a first frame period in which the LCD performs an operation of displaying a predetermined image, and a driving signal is sequentially applied to the gate or storage lines during a second frame period in which the LCD performs an operation of recognizing a touch.

10. The LCD according to claim 9, wherein the first and second frame periods are sequentially and repeatedly operated.