PITCH ADJUSTMENT OF FERROELECTRIC LIQUID CRYSTALS
Original Publication Date: 1988-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
The pitch of a ferroelectric liquid crystal is an important parameter in device performance. In devices with the book-shelf configuration, for example, where the helix of the ferroelectric liquid crystal is unwound and the smectic planes are substantially perpendicular to the substrates, the cell spacing required to achieve helix unwinding is dependent upon the pitch of the material. Cell spacing must be less than the pitch of the helix for unwinding to occur. Thus, if the pitch of the material is 3pm, the spacing must be less than 3pm, around 2pm or below. This rule puts severe constraints on materials and cell spacings for use in devices with the book-shelf geometry. Adjustment of the pitch of the helix is thus a useful tool to have in device applications.