Liquid crystal display with integrated touch sensor

• US 9,710,083 B2
• Filed: 09/11/2013
• Issued: 07/18/2017
• Est. Priority Date: 12/31/2012
• 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: Pak, Sang-Jin, Lee, Ji-Gong, Ha, Sang-Kwon, Yoshimura, Hideo, Park, Jin-Woo
• Primary Examiner(s): Ghebretinsae, Temesghen
• Assistant Examiner(s): Ketema, Benyam
• Application Number:
  US14/023,518
• Publication Number:
  US 20140184533A1
• Time in Patent Office: 1,406 Days
• Field of Search: 345173
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• 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 integrated with a touch sensor includes a first substrate including pixels connected to gate wires and data wires, a second substrate positioned to face the first substrate, a plurality of common electrodes corresponding to the pixels, a plurality of sensing electrodes on the second substrate, a liquid crystal layer between the first substrate and the second substrate, a gate drive unit driven corresponding to a gate control signal and configured to supply a gate signal to the pixels through the gate wires, a common electrode drive unit configured to supply a touch driving signal to the common electrodes during a touch driving period, and a control unit configured to supply a gate control signal synchronized with the touch driving signal to the gate drive unit.

Claims

1. A liquid crystal display integrated with a touch sensor, the display comprising,

a first substrate including pixels, the pixels connected to gate wires and data wires;

a second substrate facing the first substrate;

a plurality of common electrodes corresponding to the pixels;

a plurality of sensing electrodes on the second substrate;

a liquid crystal layer between the first substrate and the second substrate;

a controller to generate a gate control signal;

a gale driver to receive the gate control signal from the controller, to generate a gate signal based on the gate control signal, and to supply the gate signal to the pixels through the gate wires;

a common electrode driver to generate a touch driving signal and to supply the touch driving signal to the common electrodes during a touch driving period, wherein;

the controller supplies the gate control signal being synchronized with the touch driving signal to the gate driver during the touch driving period,

the gate control signal includes at least one clock signal in the touch driving period, the at least one clock signal has a pulse width that is an integer multiple of a pulse width of the touch driving signal, and

the at least one clock signal has a first width size in a display period, and has a second width size different from the first width size in the touch driving period, and wherein

the second width size is adjusted from the first width size such that edges of the at least one clock signal arc synchronized with edges of the touch driving signal.

2. The display as claimed in claim 1, wherein the common electrode driver is configured to supply a common voltage to the common electrodes during the display period.

3. The display as claimed in claim 2, wherein the display period and the touch driving period alternate.

4. The display as claimed in claim 2, wherein the touch driving signal has a higher voltage than that of the common voltage.

5. The display as claimed in claim 1, wherein the common electrodes are on the first substrate or the second substrate.

6. The display as claimed in claim 1, further comprising:

a first polarizing plate and a second polarizing plate respectively attached to an external surface of the first substrate and the second substrate; and

a window attached to an external surface of the second polarizing plate.

7. The display as claimed in claim 6, wherein the sensing electrodes are between the second substrate and the window.

8. The display as claimed in claim 1, further comprising a back light positioned below the first substrate and configured to supply light.

9. The display as claimed in claim 1, wherein the common electrodes and the sensing electrodes intersect with each other.

10. The display as claimed in claim 1, wherein the integer multiple is 2 or more.

11. The display as claimed in claim 1, wherein the at least one clock signal includes first and second clock signals, each of the first and second clock signals having the pulse width that is the integer multiple of the pulse width of the touch driving signal.

12. The display as claimed in claim 1, wherein the at least one clock signal includes first and second clock signals having a reversed phase from each other.