Circuit for the actuation of liquid crystal layers in mirrors

US4678281A · kind A · utility

Inventor

• Rainer Bauer · Wildberg, DE

Key dates

• Filing date: Mar 26, 1985
• Grant date: Jul 7, 1987
• Expiry date: Mar 26, 2005

Classification

• Technology area (CPC G): Physics
• CPC primary: G02F1/13318
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Circuit layout for the actuation of liquid crystal layers, formed by flip-flops (4, 5) arranged in the feeder lines of the conducting layers, with a common dimmer-IC preceding the reset inlets (R) and synchronized in a frequency dependent manner, wherein the flip-flops (4, 5) are timed synchronously, so that their preparatory inlets (4/5, 5/9) are actuated with a phase shift of 180.degree. and the clocking inlets (4/3, 5/11) are timed with the double frequency of the preparatory inlets (4/5, 5/9). The timing means consists of an oscillator (10a) and a decoupling gate (10b), the outlets of which are connected with a frequency divider, each (8, 9) preceding the dimmer-IC (7) and the flip-flops (4, 5), of which the frequency divider (9) preceding the flip-flops (4, 5) serves as an alternator, the inverted outlets (9/1, 9/2) of which are connected with a preparatory inlet (4/5, 3/9) of the flip-flops (4, 5). The liquid crystal layer, the conducting layers arranged on transparent support layers and one of the polarizing filter layers are combined in a composite, while the other polarizing filter layer is formed in a spaced apart support.