LIQUID CRYSTAL DISPLAY WITH BUILT-IN TOUCH SCREEN PANEL

• US 20120105337A1
• Filed: 02/18/2011
• Published: 05/03/2012
• Est. Priority Date: 10/29/2010
• Status: Abandoned Application

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Cho, Se-Il, Rho, Soo-Guy, Jun, Sang-Hyun, Song, Sung-Hoon
• Application Number:
  US13/031,164
• Publication Number:
  US 20120105337A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/134318 having a patterned common electrode
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• 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 liquid crystal display (LCD) having a built-in touch screen panel includes a first substrate having a plurality of pixels, wherein each of the pixels comprises a thin film transistor and a pixel electrode; a plurality of common electrode patterns corresponding to the pixel electrodes and spaced from each other along a second direction; a second substrate facing the first substrate, the second substrate having color filter patterns, wherein the color filter patterns are arranged to correspond to the pixels; a plurality of black matrix patterns between the color filter patterns, the plurality of black matrix patterns being spaced from each other along a first direction crossing the second direction; and a liquid crystal layer between the first and second substrates, wherein the plurality of common electrode patterns and at least one of the black matrix patterns are used as driving electrodes and sensing electrodes, respectively.

Claims

1. A liquid crystal display (LCD) having a built-in touch screen panel, the LCD comprising:

a first substrate having a plurality of pixels, wherein each of the pixels comprises a thin film transistor and a pixel electrode;

a plurality of common electrode patterns corresponding to the pixel electrodes and spaced from each other along a second direction;

a second substrate facing the first substrate, the second substrate having color filter patterns, wherein the color filter patterns are arranged to correspond to the pixels;

a plurality of black matrix patterns between the color filter patterns, the plurality of black matrix patterns being spaced from each other along a first direction crossing the second direction; and

a liquid crystal layer between the first and second substrates,

wherein the plurality of common electrode patterns and at least one of the black matrix patterns are used as driving electrodes and sensing electrodes, respectively.

2. The LCD according to claim 1, wherein the black matrix patterns comprise first black matrix patterns and dummy black matrix patterns between the first black matrix patterns.

3. The LCD according to claim 2, wherein the dummy black matrix patterns are maintained in a floating state, or a ground voltage (GND) is applied to the dummy black matrix patterns.

4. The LCD according to claim 2, further comprising:

voltage application pads coupled to the plurality of common electrode patterns; and

voltage detection pads coupled to the first black matrix patterns.

5. The LCD according to claim 4, wherein at least one of the voltage application pads or the voltage detection pads is on a surface of the second substrate facing the first substrate.

6. The LCD according to claim 5, wherein the at least one of the voltage application pads or the voltage detection pads is electrically connected to a metal pattern on the first substrate through a sealing member.

7. The LCD according to claim 6, wherein the sealing member comprises a conductive material, and one side of the conductive material contacts a corresponding one of the pads and another side of the conductive material contacts the metal pattern.

8. The LCD according to claim 7, wherein the conductive material comprises a conducting ball.

9. The LCD according to claim 7, wherein the metal pattern is electrically connected to a flexible printed circuit board attached to one surface of the first substrate.

10. The LCD according to claim 2, wherein the first black matrix patterns are between adjacent ones of the color filter patterns, and are configured to be implemented as black matrix lines that are spaced from each other along the first direction.

11. The LCD according to claim 10, wherein two or more of the black matrix lines are coupled to a same voltage application pad so as to be operated as one sensing electrode.

12. The LCD according to claim 2, wherein the first black matrix patterns comprise an opaque conductive material, and the dummy black matrix patterns comprise an opaque conductive material or opaque organic material.

13. The LCD according to claim 12, wherein the opaque conductive material comprises chrome (Cr) or chrome oxide (CrOx).

14. The LCD according to claim 1, wherein adjacent ones of the color filter patterns are overlapped with each other in an open region between the black matrix patterns.

15. The LCD according to claim 1, further comprising an additional black matrix pattern made of a non-conductive organic material formed in an open region between the black matrix patterns so as to be overlapped with the open region.

16. The LCD according to claim 1, wherein the plurality of common electrode patterns is on the second substrate.

17. The LCD according to claim 16, wherein the color filter patterns between the plurality of common electrode patterns and the plurality of black matrix patterns serve as a dielectric substance.

18. The LCD according to claim 1, wherein the plurality of common electrode patterns is on the first substrate.

19. The LCD according to claim 18, wherein at least one slit is at a region of the common electrode patterns corresponding to the pixel electrode of each of the pixels.

20. The LCD according to claim 18, wherein the liquid crystal layer is between the plurality of common electrode patterns and the black matrix patterns, and serves as a dielectric substance.

21. The LCD according to claim 1, wherein the LCD is configured to perform an operation of displaying an image during a first frame period, and to perform an operation of recognizing a touch during a second frame period, and

wherein a same voltage is applied to the common electrode patterns during the first frame period and a driving signal is sequentially applied to the common electrode patterns during the second frame period.

22. The LCD according to claim 21, wherein the first and second frame periods are sequentially and repeatedly operated.