Apparatus and method for driving liquid crystal display device

• US 8,581,819 B2
• Filed: 12/28/2006
• Issued: 11/12/2013
• Est. Priority Date: 06/30/2006
• Status: Expired due to Fees

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Choi, Sang Ho
• Primary Examiner(s): Awad, Amr
• Assistant Examiner(s): BRAY, STEPHEN A
• Application Number:
  US11/646,556
• Publication Number:
  US 20080001873A1
• Time in Patent Office: 2,511 Days
• Field of Search: 345/87, 345/92, 349 41- 42, 349/48, 349/139
• US Class Current: 345/92
• 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, a gate line, a pixel electrode, and a reset electrode being formed on the first substrate, the first data line crossing the gate line to define a pixel region;

a common electrode being formed on the second substrate;

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

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

wherein during a first period of a frame, the pixel electrode and the reset electrode are configured to generate a horizontal electric field with respect to the substrates to display images;

wherein, during a second period of the frame, a reset voltage is applied to the reset electrode by the second data line in order to generate a vertical field with respect to the substrates to restore the liquid crystal molecules,

wherein, an additional gate signal is applied to the first and second switching elements,

in synchronization with the additional gate signal, the reset voltage is applied to the reset electrode and a data signal is applied to the pixel electrode,

wherein, a voltage of a same level is applied to the pixel and reset electrodes, and a different voltage is applied to the common electrode, thereby forming the vertical electric field;

wherein the first period and the second period are different periods from each other, and

wherein the reset electrode is formed for each block comprising a plurality of pixels.

2. A method of driving a liquid crystal display device, the method 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 to display images, the pixel electrode and the reset electrode being formed on a first substrate and the common electrode being formed on a second substrate facing the first substrate,

wherein a first gate scanning pulse is applied to a gate line to turn on a first switching element and a second switching element connected thereto, the first switching element being electrically connected to the pixel electrode and the second switching element being electrically connected to the reset electrode;

during a second period of the frame, applying the first voltage to the reset electrode and the pixel electrode while applying the second voltage to the common electrode until the liquid crystal molecules are restored,

wherein a second gate scanning pulse is applied to the gate line to turn on the first switching element and the second switching element,

in synchronization with the second gate scanning pulse, a reset voltage is applied to the reset electrode and the first voltage is applied to the pixel electrode,

the reset voltage and first voltage comprising a same voltage, and a different voltage is applied to the common electrode, thereby forming a vertical electric field;

wherein the first period and the second period are different periods from each other, and

wherein the reset electrode is formed for each block comprising a plurality of pixels.

3. The method of claim 2, wherein the first voltage corresponds to a data voltage, and the second voltage corresponds to a common voltage.

4. The method of claim 2, wherein a horizontal electric field is formed between the pixel electrode and the reset electrode during the first period.

5. The method of claim 2, wherein the vertical electric field is formed between the common electrode and the pixel and reset electrodes during the second period.

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

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

wherein a first gate scanning pulse is applied to a gate line to turn on a first switching element and a second switching element connected thereto, the first switching element being electrically connected to the pixel electrode and the second switching element being electrically connected to the reset electrode; and

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

wherein a second gate scanning pulse is applied to the gate line to turn on the first switching element and the second switching element,

in synchronization with the second gate scanning pulse, a reset voltage is applied to the reset electrode and a first voltage is applied to the pixel electrode,

the reset voltage and the first voltage comprising a same voltage, and a different voltage is applied to the common electrode, thereby forming the vertical electric field;

wherein the first period and the second period are different periods from each other, and

wherein the reset electrode is formed for each block comprising a plurality of pixels.