METHOD FOR DRIVING LIQUID CRYSTAL ELEMENT

• Main Authors: KATAOKA NOBUE, KAWAKADO KOICHI, MATSUI ERIKO
• Format: Patent
• Language: English
• Published: 16.02.1999
• Edition: 6
• Subjects: ADVERTISING; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION; CRYPTOGRAPHY; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DISPLAY; EDUCATION; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; SEALS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

PROBLEM TO BE SOLVED: To provide a method for driving liquid crystal element which suppresses burning, etc., by smoothly switching the liquid crystal element. SOLUTION: This method for driving the liquid crystal element consists in impressing a selection pulse after impressing a reset pulse including a first reset pulse and a second reset pulse of the polarity reverse from the polarity of this first reset pulse at the time of driving the liquid crystal element disposed with liquid crystals between a first substrate having data electrodes arrayed in one direction and a second substrate having selection electrodes arrayed in the direction intersecting with these data electrodes. In this method, the additive pulse A2 of the same polarity as the polarity of the first reset pulse A1 is impressed between the second reset pulse B and the second selection pulse (a) to make the sum of the electric field intensity area A2 of the additive pulse A2 and the electric field intensity area A1 of the first reset pulse A1 substantially is equalized to the electric field intensity area B of the second reset pulse B. In addition, the voltage of the additive pulse A2 is made the same in the polarity as the polarity of the threshold voltage at the time of switching of the liquid crystals and below this threshold voltage.