Method of driving vertically aligned liquid crystal display

• US 20050104833A1
• Filed: 09/15/2003
• Published: 05/19/2005
• Est. Priority Date: 03/26/2003
• Status: Abandoned Application

• Current Assignee: Victor Company of Japan Limited (JVC Kenwood Corporation)
• Original Assignee: Victor Company of Japan Limited (JVC Kenwood Corporation)
• Inventors: Shigeta, Masanobu, Ochi, Yutaka
• Application Number:
  US10/661,808
• Publication Number:
  US 20050104833A1
• Time in Patent Office: Days
• US Class Current: 345/96
• CPC Class Codes: G09G 2300/0857 Static memory circuit, e.g. flip-flop
• CPC Class Codes: G09G 3/2022 using sub-frames
• CPC Class Codes: G09G 3/2029 the sub-frames having non-binary weights
• CPC Class Codes: G09G 3/3651 using multistable liquid crystals, e.g. ferroelectric liquid crystals
• 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 vertically aligned liquid crystal display is driven by a digital drive signal. One field of each of pulses carried by the digital drive signal is divided into a plurality of subfields. Each subfield has a display-off period for which a liquid crystal is not driven and a display-on period for which the liquid crystal is driven. A ratio of the total of the display-on periods over the subfields to the one field is in the range from 1:6 to 5:6. At least a saturated drive voltage is supplied as the digital drive signal to the liquid crystal for each display-on period to modulate light incident in the liquid crystal.

Claims

1. A method of driving a vertically aligned liquid crystal display comprising the steps of:

dividing one field of each of pulses carried by a digital drive signal into a plurality of subfields, each subfield having a display-off period for which a liquid crystal is not driven and a display-on period for which the liquid crystal is driven, a ratio of the total of the display-on periods over the subfields to the one field being in the range from 1;

6 to 5;

6; and

supplying at least a saturated drive voltage as the digital drive signal to the liquid crystal for each display-on period to modulate light incident in the liquid crystal.

2. driving method according to claim 1 further comprising the step of dividing the display-on period in each subfield into a plurality of sub-display-on periods when the display-on period in each subfield is longer than a period for which disclination occurs.

3. The driving method according to claim 1, wherein the supplying step includes the step of supplying a voltage larger than the saturated drive voltage to the liquid crystal.