Ferroelectric liquid crystal display and driving method thereof

• US 20030067567A1
• Filed: 07/16/2002
• Published: 04/10/2003
• Est. Priority Date: 10/10/2001
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Wang, Jong-Min
• Application Number:
  US10/195,760
• Publication Number:
  US 20030067567A1
• Time in Patent Office: Days
• US Class Current: 349/75
• CPC Class Codes: G09G 2300/023 Display panel composed of stacked panels
• CPC Class Codes: G09G 3/2011 by amplitude modulation
• CPC Class Codes: G09G 3/36 using liquid crystals
• CPC Class Codes: G09G 3/3629 using liquid crystals having memory effects, e.g. ferroelectric liquid crystals

Abstract

A ferroelectric liquid crystal display and a driving method thereof. The ferroelectric liquid crystal comprises a display panel which is disposed between polarizers of which polarization axis are orthogonal to each other, and in which a liquid crystal layer formed between electrode layers is filled with half-V type ferroelectric liquid crystal having a bookshelf structure, the electrode layers being disposed between substrates to be orthogonal and opposite to each other; and a compensation panel which is disposed between the display panel and the polarizer, and in which a liquid crystal layer formed between electrode layers is filled with the half-V type ferroelectric liquid crystal having a bookshelf structure, the electrode layers being disposed between substrates to be opposite to each other. Therefore, the light loss can be reduced, and thus the gray scale display can be improved.

Claims

1. A ferroelectric liquid crystal display, comprising:

a display panel which is disposed between polarizers of which polarization axes are orthogonal to each other, and in which a first liquid crystal layer formed between first electrode layers is filled with a half-V type ferroelectric liquid crystal having a bookshelf structure, the first electrode layers being disposed between first substrates to be orthogonal and opposite to each other; and

a compensation panel which is disposed between the display panel and one of the second polarizers, and in which a second liquid crystal layer formed between second electrode layers is filled with the half-V type ferroelectric liquid crystal having a bookshelf structure, the second electrode layers being disposed between second substrates to be opposite to each other.

2. The display of claim 1, wherein a rubbing direction of an alignment film of the display panel corresponds to a rubbing direction of an alignment film of the compensation panel.

3. The display of claim 1, wherein a material of the half-V type ferroelectric liquid crystal has a property by which the phase of the half-V type ferroelectric liquid crystal is transformed from a chiral nematic phase into a chiral smectic C-phase during a crystallization process.

4. A method of driving a ferroelectric liquid crystal display having a first polarizer, a display panel in which half-V type ferroelectric liquid crystal is filled between first electrode layers disposed to be orthogonal to each other, a compensation panel in which half-V type ferroelectric liquid crystal is filled between second electrode layers disposed to be opposite to each other and a second polarizer, in turn, comprising steps of:

applying an AC potential to the second electrode layers of the compensation panel; and

applying an AC potential corresponding to a gray scale of display data to the first electrode layers of the display panel.