Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1989-11-20
1991-12-03
James, Andrew J.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
G02F 113
Patent
active
050695320
ABSTRACT:
Disclosed are a method and apparatus for addressing a ferroelectric liquid crystal array where pixels are formed at the intersections of columns and rows of electrodes wherein one embodiment of a column write pulse sequence comprises four pulses- one a threshold pulse, two sub-threshold pulses and one zero pulse- all of equal width and within one unit at a time. In another embodiment a column write pulse sequence comprises five pulses- one a threshold pulse, three sub-threshold pulses and one zero pulse, with the threshold and zero pulses having equal widths and the three sub-threshold pulses having equal widths which is twice the width of the threshold pulses. In both embodiments, the same sequence of write pulses are used as row pulses but delayed or advanced to create electric fields of different directions to write a +1 or a -1 pixel depending upon whether or not the row pulse sequence is advanced or delayed. Also disclosed are non-writing pulse sequences to be addressed where a threshold field is undesirable.
REFERENCES:
patent: 4447131 (1984-05-01), Soma
patent: 4548476 (1985-10-01), Kaneko
Bowers Courtney A.
Dwyer Joseph R.
James Andrew J.
OCA Applied Optics, Inc.
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