LIQUID CRYSTAL DISPLAY WITH INTEGRATED TOUCH SCREEN PANEL AND DRIVING METHOD THEREOF

• US 20120105752A1
• Filed: 09/21/2011
• Published: 05/03/2012
• 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: Park, Jin-Woo, Pak, Sang-Jin, Lee, Jin-Hee, Ha, Sang-Kwon, Yoshimura, Hideo, Kim, Cheol-Min, Lee, Joo-Hyung, Lee, Ji-Gong
• Granted Patent: US 8,891,048 B2
• Time in Patent Office: Days
• US Class Current: 349/33
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/134318 having a patterned common electrode
• 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
• CPC Class Codes: G09G 2310/0218 with collection of electrodes in groups for n-dimensional addressing
• CPC Class Codes: G09G 2310/0227 related to multiple interlacing, i.e. involving more fields than just one odd field and one even field
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A liquid crystal display (LCD) with an integrated touch screen panel includes a plurality of pixels connected to a plurality of data lines and a plurality of gate lines, the gate lines being divided into a plurality of groups, a plurality of sensing electrodes, a plurality of common electrodes divided into a plurality of groups, a common electrode driver configured to simultaneously supply a driving signal to common electrodes within each group of the plurality of groups of the common electrodes, and to sequentially supply the driving signal to the plurality of groups of the common electrodes, and a gate driver configured to sequentially supply a gate signal to gate lines within each of the plurality of group of the gate lines.

Claims

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

a plurality of pixels connected to a plurality of data lines and a plurality of gate lines, the gate lines being divided into a plurality of groups;

a plurality of sensing electrodes;

a plurality of common electrodes divided into a plurality of groups;

a common electrode driver configured to simultaneously supply a driving signal to common electrodes within each group of the plurality of groups of the common electrodes, and to sequentially supply the driving signal to the plurality of groups of the common electrodes; and

a gate driver configured to sequentially supply a gate signal to gate lines within each of the plurality of group of the gate lines.

2. The LCD as claimed in claim 1, further comprising:

first and second substrates spaced apart from each other; and

a liquid crystal layer between the first and second substrates.

3. The LCD as claimed in claim 2, wherein the sensing electrodes and the common electrodes are positioned in a same layer or in different layers from each other at any one of the substrates.

4. The LCD as claimed in claim 1, wherein the sensing electrodes and the common electrodes intersect each other.

5. The LCD as claimed in claim 1, wherein the common electrodes define a plurality of groups divided in a regular sequence.

6. The LCD as claimed in claim 1, wherein the gate lines define a plurality of groups divided based on a predetermined sequence difference.

7. The LCD as claimed in claim 1, wherein the supply of the driving signal by the common electrode driver and the supply of the gate signal by the gate driver are alternately performed.

8. The LCD as claimed in claim 1, wherein the common electrode driver is configured to supply a same common voltage to all the common electrodes, except during a period in which the driving signal is supplied.

9. The LCD as claimed in claim 8, wherein the driving signal has a higher voltage than the common voltage.

10. The LCD as claimed in claim 1, wherein, for two groups divided into odd-numbered gate lines and even-numbered gate lines, the gate driver is configured to sequentially supply a gate signal to gate lines included in each of the groups of gate lines.

11. The LCD as claimed in claim 10, wherein the supply of the driving signal by the common electrode driver and the supply of the gate signal to each of the groups by the gate driver are alternately performed.

12. The LCD as claimed in claim 10, wherein, for a plurality of groups obtained by respectively dividing odd-numbered common electrodes and even-numbered common electrodes based on sequence differences, the common electrode driver simultaneously supplies a driving signal to common electrodes included in each of the groups, sequentially supplies the driving signal to the plurality of groups configured as the odd-numbered common electrodes, and sequentially supplies the driving signal to the plurality of groups configured as the even-numbered common electrodes.

13. The LCD as claimed in claim 12, wherein the supply of the driving signal to the plurality of groups configured as the odd-numbered common electrodes is performed before the supply of the gate signal to the group configured as the odd-numbered gate lines, and the supply of the driving signal to the plurality of groups configured as the even-numbered common electrodes is performed before the supply of the gate signal to the group configured as the even-numbered gate lines.

14. A driving method of an LCD with an integrated touch screen panel, the method comprising:

dividing common electrode patterns into a first plurality of groups based on a first predetermined sequence difference;

dividing gate lines into a second plurality of groups based on a second predetermined sequence difference;

simultaneously supplying a driving signal to common electrode patterns within a same group of the first plurality of groups and sequentially supplying the driving signal to the first plurality of groups; and

sequentially supplying a gate signal to gate lines included in the second plurality of groups.

15. The method as claimed in claim 14, wherein supplying the driving and gate signals includes supplying the driving signal and the gate signal alternately.

16. The method as claimed in claim 14, wherein supplying the driving signal and the gate signal includes applying a same common voltage to all the common electrode patterns, except the period in which the driving signal is supplied.

17. The method as claimed in claim 16, wherein the driving signal has a higher voltage than the common voltage.

18. The method as claimed in claim 14, wherein supplying the driving signal and the gate signal includes dividing the gate lines into two groups of odd-numbered gate lines and even-numbered gate lines to have a sequence difference of two.

19. The method as claimed in claim 14, wherein, in the supplying of the driving signal and the gate signal, for a plurality of groups obtained by respectively dividing odd-numbered common electrode patterns and even-numbered common electrode patterns based on sequence differences, the common electrode driver simultaneously supplies a driving signal to common electrode patterns included in each of the groups, sequentially supplies the driving signal to the plurality of groups configured as the odd-numbered common electrode patterns, and sequentially supplies the driving signal to the plurality of groups configured as the even-numbered common electrode patterns.

20. The method as claimed in claim 14, wherein, in the supplying of the driving signal and the gate signal, the supply of the driving signal to the plurality of groups configured as the odd-numbered common electrode patterns is performed before the supply of the gate signal to the group configured as the odd-numbered gate lines, and the supply of the driving signal to the plurality of groups configured as the even-numbered common electrode patterns is performed before the supply of the gate signal to the group configured as the even-numbered gate lines.