当代显示技术 第一章(14)

当代显示技术 第一章

Smectic B (SmB) forms a hexagonal structure in the x-y plane.(almost like a perfect crystal)

Chiral Smectic C (SmC*) is also called ferroelectric LC. Moreon that later.

Structurally, cholesteric = chiral nematic (N*) = twisted nematicTN LCD = twisted nematic LCD

STN LCD = supertwisted nematic LCD

(All nematic.)

Chiral = twist. Can be induced by chiral dopants, or intrinsic inthe LC molecule itself.

Whether a cholesteric is called a TN or STN or SSTN (Ch)

depends on the natural pitch.

p

TN pitch – 100 µm

STN pitch – 10 µm

Chpitch – 1 µm