Apparatus and method for driving liquid crystal display device

• US 20080001873A1
• Filed: 12/28/2006
• Published: 01/03/2008
• Est. Priority Date: 06/30/2006
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Choi, Sang Ho
• Granted Patent: US 8,581,819 B2
• Time in Patent Office: Days
• US Class Current: 345/87
• CPC Class Codes: G09G 2300/0434 Flat panel display in which a field is applied parallel to the display plane
• CPC Class Codes: G09G 2310/061 for resetting or blanking
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
• CPC Class Codes: G09G 3/3659 the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes

Abstract

A liquid crystal display device includes first and second substrates facing each other with a liquid crystal layer therebetween, a first data line, a second data line, a gate line, a pixel electrode and a reset electrode on the first substrate, the first data line crossing the gate line to define a pixel region, and a common electrode on the second substrate, during a first period of a frame, the pixel electrode and the reset electrode generating a horizontal electric field with respect to the substrates, and during a second period of the frame the common electrode and the pixel and reset electrodes generating a vertical electric field with respect to the substrates.

Claims

1. A liquid crystal display device, comprising:

first and second substrates facing each other with a liquid crystal layer therebetween;

a first data line, a second data line and a gate line on the first substrate, the first data line crossing the gate line to define a pixel region;

a pixel electrode electrically connected to the first data line;

a reset electrode electrically connected to the second data line; and

a common electrode on the second substrate.

2. The device of claim 1, further comprising:

a first switching element electrically connected to the gate line and the pixel electrode;

a second switching element electrically connected to the gate line and the reset electrode.

3. The device of claim 2, wherein the first switching element supplies a data signal to the pixel electrode during a first period and a second period, and the second switching element supplies a reset signal to the reset electrode during the second period.

4. A liquid crystal display device, comprising:

first and second substrates facing each other with a liquid crystal layer therebetween;

a first data line, a second data line, a gate line, a pixel electrode and a reset electrode on the first substrate, the first data line crossing the gate line to define a pixel region; and

a common electrode on the second substrate,

during a first period of a frame, the pixel electrode and the reset electrode generating a horizontal electric field with respect to the substrates, and

during a second period of the frame the common electrode and the pixel and reset electrodes generating a vertical electric field with respect to the substrates.

5. The device of claim 4, further comprising:

a first switching element electrically connected to the gate line and the pixel electrode;

a second switching element electrically connected to the gate line and the reset electrode.

6. The device of claim 5, wherein the first switching element supplies a data signal to the pixel electrode during the first period and the second period, and the second switching element supplies a reset signal to the reset electrode during the second period.

7. A method of driving a liquid crystal display device, comprising:

during a first period of a frame, applying a first voltage to a pixel electrode while applying a second voltage to a common electrode and a reset electrode, the pixel electrode and the reset electrode being on a first substrate and the common electrode being on a second substrate facing the first substrate; and

during a second period of the frame, applying the first voltage to the pixel and reset electrodes while applying the second voltage to the common electrode.

8. The method of claim 7, further comprising:

during the first period of the frame, applying a first gate scanning pulse to a gate line turn on a first switching element connected thereto, the first switching element electrically connected to the pixel electrode; and

during the second period of the frame, applying a second gate scanning pulse to the gate line to turn on a second switching element connected thereto, the second switching element electrically connected to the reset electrode.

9. The method of claim 7, wherein the first voltage corresponds to a data voltage, and the second voltage corresponds to a common voltage.

10. The method of claim 7, wherein a horizontal electric field is formed between the pixel electrode and the reset electrode during the first period.

11. The method of claim 7, wherein a vertical electric field is formed between the common electrode and the pixel and reset electrodes during the second period.

12. A method of driving a liquid crystal display device, comprising:

during a first period of a frame, generating a horizontal electric field between a pixel electrode and a reset electrode, the pixel and reset electrodes formed on a first substrate of the liquid crystal display device; and

during a second period of the frame, generating a vertical electric field between a common electrode and the pixel and reset electrodes, the common electrode formed on the second substrate of the liquid crystal display device.

13. The method of claim 12, further comprising:

during the first period of the frame, applying a first gate scanning pulse to a gate line turn on a first switching element connected thereto, the first switching element electrically connected to the pixel electrode; and

during the second period of the frame, applying a second gate scanning pulse to the gate line to turn on a second switching element connected thereto, the second switching element electrically connected to the reset electrode.