Liquid crystal display device and driving method thereof

• US 9,424,787 B2
• Filed: 11/12/2013
• Issued: 08/23/2016
• Est. Priority Date: 12/21/2012
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Park, Yong Beom, Kang, Jung Youl, Lee, Kyoung Koo, Kim, Han Su, Lee, Jin Hee
• Primary Examiner(s): Karimi, Pegeman
• Application Number:
  US14/078,266
• Publication Number:
  US 20140176408A1
• Time in Patent Office: 1,015 Days
• Field of Search: 345/76, 345/204, 345/211, 345/212
• US Class Current: 1/1
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general

Abstract

Discussed is an LCD device. The LCD device according to an embodiment of the present invention includes a liquid crystal panel in which a plurality of pixels are respectively formed in a plurality of areas defined by intersections between a plurality of gate lines and a plurality of data lines, and a driving unit configured to switch inversion systems for driving the liquid crystal panel at predetermined periods.

Claims

1. A liquid crystal display (LCD) device comprising:

a liquid crystal panel in which a plurality of pixels are respectively formed in a plurality of areas defined by intersections between a plurality of gate lines and a plurality of data lines; and

a driving unit configured to

convert image data into respective data voltages by applying a first inversion system to a fourth inversion system in a first frame to a fourth frame, respectively, which are immediately adjacent frames for driving the liquid crystal panel during an operating period of the driving unit, and

output the respective data voltages to all of the plurality of data lines during the first to fourth frames,

wherein the driving unit changes an order of the first inversion system to the fourth inversion system at an intermediate point during the operating period of the driving unit.

2. The LCD device of claim 1, wherein the first to fourth inversion systems comprise a vertical 1-dot and horizontal 1-dot inversion system (V1H1), a vertical 2-dot and horizontal 1-dot inversion system (V2H1), a vertical 1-dot and horizontal 2-dot inversion system (V1H2), and a vertical 2-dot and horizontal 2-dot inversion system (V2H2).

3. The LCD device of claim 2, wherein the driving unit sequentially switches the first to fourth inversion systems in units of at least one frame for each inversion system.

4. The LCD device of claim 2, wherein the driving unit sequentially switches the first to fourth inversion systems in units of one frame for each inversion system.

5. The LCD device of claim 2, wherein the driving unit sequentially switches the first to fourth inversion systems in units of four frames for each inversion system.

6. A method of driving a liquid crystal display (LCD) device including a driving unit and a liquid crystal panel, the method comprising:

converting, via the driving unit, image data into respective data voltages by applying a first inversion system to a fourth inversion system in a first frame to a fourth frame, respectively, which are immediately adjacent frames for driving the liquid crystal panel during an operating period of the driving unit; and

outputting, via the driving unit, the respective data voltages to all of a plurality of data lines during the first to the fourth frames,

wherein the driving unit changes an order of the first inversion system to the fourth inversion system at an intermediate point during the operating period of the driving unit.

7. The method of claim 6, wherein the first to fourth inversion systems comprise a vertical 1-dot and horizontal 1-dot inversion system (V1H1), a vertical 2-dot and horizontal 1-dot inversion system (V2H1), a vertical 1-dot and horizontal 2-dot inversion system (V1H2), and a vertical 2-dot and horizontal 2-dot inversion system (V2H2).

8. The method of claim 7, wherein the converting comprises sequentially switching the first to fourth inversion systems in units of at least one frame for each inversion system.

9. The method of claim 7, wherein the converting comprises sequentially switching the first to fourth inversion systems in units of one frame for each inversion system.

10. The method of claim 7, wherein the converting comprises sequentially switching the first to fourth inversion systems in units of four frames for each inversion system.

11. A liquid crystal display (LCD) device comprising:

a liquid crystal panel in which a plurality of pixels are respectively formed in a plurality of areas defined by intersections between a plurality of gate lines and a plurality of data lines; and

a driving unit configured to;

sequentially convert image data into respective data voltages by applying a first inversion system to a fourth inversion system in a first frame to a fourth frame, respectively, which are immediately adjacent frames for driving the liquid crystal panel during an operating period of the driving unit, and

output the respective data voltages to all of the plurality of data lines during the first to fourth frames,

wherein the driving unit changes an order of the first inversion system to the fourth inversion system at an intermediate point during the operating period of the driving unit.

12. The LCD device of claim 11, wherein the first to fourth inversion systems comprise a vertical 1-dot and horizontal 1-dot inversion system (V1H1), a vertical 2-dot and horizontal 1-dot inversion system (V2H1), a vertical 1-dot and horizontal 2-dot inversion system (V1H2), and a vertical 2-dot and horizontal 2-dot inversion system (V2H2).