LIQUID CRYSTAL DISPLAY INTEGRATED TOUCH SCREEN PANEL

• US 20120044171A1
• Filed: 06/24/2011
• Published: 02/23/2012
• Est. Priority Date: 08/19/2010
• Status: Abandoned Application

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Lee, Jin-Hee, Pak, Sang-Jin, Yoshimura, Hideo, Park, Jin-Woo, Lee, Joo-Hyung, Kim, Bum-Joon, Ha, Sang-Kwon
• Application Number:
  US13/168,545
• Publication Number:
  US 20120044171A1
• Time in Patent Office: Days
• US Class Current: 345/173
• 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
• CPC Class Codes: G06F 3/0448 Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality

Abstract

A touch screen panel integrated liquid crystal display device in which a mutual capacitive touch screen panel is integrated with a liquid crystal display panel is provided. The device includes a first substrate, a plurality of pixels on the first substrate and including respective pixel electrodes, a second substrate facing the first substrate, a common electrode on a first surface of the second substrate facing the pixel electrodes, a plurality of sensor electrodes on a second surface of the second substrate and including a plurality of transparent pairs extending in a first direction and having a plurality of protrusions extending in a second direction crossing the first direction, and a liquid crystal layer between the substrates, wherein the device senses a touch position by detecting a change of capacitance applied to the sensor electrodes corresponding to an alternating current common voltage applied to the common electrode.

Claims

1. A touch screen panel integrated liquid crystal display device comprising:

a first substrate;

a plurality of pixels on the first substrate and comprising respective pixel electrodes;

a second substrate facing the first substrate;

a common electrode on a first surface of the second substrate facing the pixel electrodes;

a plurality of sensor electrodes on a second surface of the second substrate and comprising a plurality of transparent pairs extending in a first direction and having a plurality of protrusions extending in a second direction crossing the first direction; and

a liquid crystal layer between the first substrate and the second substrate, wherein the touch screen panel integrated liquid crystal display device is configured to sense a touch position by detecting a change of capacitance applied to the sensor electrodes corresponding to an alternating current common voltage applied to the common electrode.

2. The touch screen panel integrated liquid crystal display device as claimed in claim 1, wherein each of the transparent pairs comprises:

a first pattern extending from a first end to a second end opposite the first end in the first direction, a width of the first pattern gradually decreasing toward the second end; and

a second pattern extending from the first end to the second end in the first direction, a width of the second pattern gradually increasing toward the second end.

3. The touch screen panel integrated liquid crystal display device as claimed in claim 2, wherein the first and second patterns each have a triangular shape and are substantially symmetrical to each other.

4. The touch screen panel integrated liquid crystal display device as claimed in claim 1, wherein the protrusions are formed in the respective transparent patterns and are substantially uniformly spaced.

5. The touch screen panel integrated liquid crystal display device as claimed in claim 1, wherein the transparent pairs are substantially symmetrical to each other, and have a substantially triangular pattern comprising the protrusions to be comb-shaped.

6. The touch screen panel integrated liquid crystal display device as claimed in claim 1, wherein a sensing signal for detecting the change of capacitance through detecting lines coupled to the sensor electrodes, is supplied corresponding to a time when the alternating current common voltage is changed.

7. The touch screen panel integrated liquid crystal display device as claimed in claim 6, wherein the device is configured to supply the sensing signal in synchronization with a rising time and a falling time of the alternating current common voltage.

8. The touch screen panel integrated liquid crystal display device as claimed in claim 6, wherein the device is configured to supply the sensing signal in synchronization with a rising time or a falling time of the alternating current common voltage.

9. The touch screen panel integrated liquid crystal display device as claimed in claim 6, wherein the device is configured to supply the sensing signal in synchronization with modifying times of the alternating current common voltage distributed at regular intervals in one frame.

10. The touch screen panel integrated liquid crystal display device as claimed in claim 1, wherein the change of capacitance applied to the sensor electrodes is detected concurrently through all detecting lines coupled to respective sensor electrodes during a sensing time corresponding to a time when the alternating current common voltage is changed.

11. The touch screen panel integrated liquid crystal display device as claimed in claim 1, wherein the sensor electrodes are alternately arranged.