Method of driving bistable displays, in particular ferroelectric liquid crystal displays

• Main Author: ESCHER, CLAUS
• Format: Patent
• Language: English; French; German
• Published: 22.09.1993
• Edition: 5
• 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; DISPLAYING; EDUCATION; FREQUENCY-CHANGING; LABELS OR NAME-PLATES; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; SEALS; SIGNS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

Informationstragende Spaltenpulse mit kürzerer Zeitdauer als für Zeilenpulse zum Aufbau von Schreibpulsen bewirken, bei gleicher zur Verfügung stehender maximaler Spannung der Zeilentreiber und gleichem Flüssigkristallmaterial wie bei konventionellen FLC Displays, eine Verbesserung einer Reihe von Displayeigenschaften, z. B. Kontrast oder Bildwechselfrequenz. Die Bildwechselfrequenz wird ferner durch Überlappung von Zeilenpulsen hintereinander adressierter Zeilen verbessert. With the same available maximum voltage of the line drivers and the same liquid crystal material as in the case of conventional FLC displays, information-carrying column pulses of shorter duration than for line pulses to build up write pulses have the effect of improving a number of display characteristics, for example the contrast or image refresh rate. The image refresh rate is further improved by overlapping line pulses of lines addressed one after the other.