Liquid crystal display device of in-plane switching mode, method of fabricating the same, and method of driving the same

• US 7,808,604 B2
• Filed: 10/17/2008
• Issued: 10/05/2010
• Est. Priority Date: 03/29/2004
• Status: Expired due to Fees

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Choi, Su Seok, Park, Ku Hyun
• Primary Examiner(s): Nelms; David
• Assistant Examiner(s): Vu; Phu
• Application Number:
  US12/253,546
• Publication Number:
  US 20090102993A1
• Time in Patent Office: 718 Days
• Field of Search: 349185-186
• US Class Current: 349/186
• CPC Class Codes: C09K 19/02 characterised by optical, electrical or physical properties of the components, in general
• CPC Class Codes: C09K 19/0225 Ferroelectric

Abstract

An in-plane switching mode liquid crystal display device includes upper and lower substrates, first and second ferroelectric liquid crystal layers, a nematic system crystal layer, and first and second electrodes. The electrodes and liquid crystal layers are located between the substrates, with the nematic liquid crystal layer between the ferroelectric liquid crystal layers. The ferroelectric liquid crystal layers have different spontaneous polarization directions. An electric field is applied to the liquid crystal layers using the electrodes. The ferroelectric liquid crystal layers react to different electric field to conduct an in-plane driving of liquid crystal molecules in the nematic liquid crystal layer.

Claims

1. A method of driving a liquid crystal display device having opposing substrates with opposing electrodes thereon and a multilayer liquid crystal layer disposed between the electrodes, the multilayer liquid crystal layer containing opposing layers of a ferroelectric liquid crystal molecules and a middle layer therebetween of a nematic liquid crystal molecules, the method comprising:

applying an electric field to the opposing layers using the opposing electrodes; and

in-plane driving liquid crystal molecules in the middle layer by permitting one of the opposing layers to react to the electric field,

wherein the opposing layers are driven in a half V-switching mode, and their spontaneous polarization directions are different from each other so that one of the opposing layers is react to a positive electric field and the other one of the opposing layers is react to a negative electric field, and

wherein the in-plane switching mode liquid crystal display is driven by a dot inversion in that the positive electric field and the negative electric field are applied to adjacent liquid crystal cells at the same time, so that the positive electric field is applied to the multilayer liquid crystal layer of a first liquid crystal cell in an odd frame and the negative electric field is applied to the multilayer liquid crystal layer of a second liquid crystal cell adjacent to the first liquid crystal cell in the odd frame.

2. The method according to claim 1, wherein the first liquid crystal cell comprises a odd liquid crystal cell of an odd horizontal line and a even liquid crystal cell of an even horizontal line, and

the second liquid crystal cell comprises a even liquid crystal cell of the odd horizontal line and a odd liquid crystal cell of the even horizontal line.

3. The method according to claim 1, wherein the first liquid crystal cell transmits light in response to the positive polarity electric field in the odd frame and transmits light in response to the negative polarity electric field in an even frame, and

the second liquid crystal cell transmits light in response to the negative polarity electric field in the odd frame and transmits light in response to the positive polarity electric field in the even frame.