Liquid crystal display device and method of driving the same

• US 7,667,808 B2
• Filed: 12/21/2006
• Issued: 02/23/2010
• Est. Priority Date: 12/28/2005
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Yamashita, Hidefumi
• Primary Examiner(s): Wood; Kevin S
• Application Number:
  US11/642,954
• Publication Number:
  US 20070146606A1
• Time in Patent Office: 1,160 Days
• Field of Search: 349139-148
• US Class Current: 349/141
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/134381 Hybrid switching mode, i.e. for applying an electric field with components parallel and orthogonal to the substrates

Abstract

A liquid crystal display device includes a first electrode and a second electrode on a first substrate, wherein a horizontal electric field is generated between the first and second electrodes, and a third electrode on a second substrate, wherein a longitudinal electric field is generated between the third electrode and the first and second electrodes. In the liquid crystal display device, control of a wide viewing angle and a narrow viewing angle is enabled.

Claims

1. A method of driving a liquid crystal display (LCD) device, comprising:

wherein the LCD device is one of an in plane switching mode and a fringe field switching mode, the LCD device having liquid crystal between upper and lower substrates includes first and second electrodes on the lower substrate to apply a first electric field to the liquid crystal, a third electrode on the upper substrate to apply a second field to the liquid crystal along with the first and second electrodes,

providing a wide viewing angle mode, when the voltage of the third electrode on the upper substrate is the same as the voltage of the first electrode on the lower substrate, wherein upper, lower, left and right viewing angle characteristics provide the wide viewing angle mode;

providing a narrow viewing angle mode, when the voltage of the third electrode on the upper substrate is higher than the voltage of the first electrode on the lower substrate, wherein the left and right viewing angle characteristics is deteriorated without changing upper and lower viewing angle characteristics at the narrow viewing angle mode; and

switching the wide viewing angle mode and the narrow viewing angle mode by adjusting a voltage applied to the third electrode.

2. The method according to claim 1, wherein the voltage of the third electrode is higher than the voltage of the first electrode by 1.2V when the left and right viewing angle characteristics are deteriorated.

3. The method according to claim 1, wherein the upper substrate further includes a dielectric film on the third electrode.