
97-16 Displays and Recorders
amount of a dichroic dye (guest) is mixed in the LC material (host). ese dye molecules get aligned to
th
e
LC mo
lecules;
he
nce,
th
eir
or
ientation
ca
n
be ch
anged
(b
y
ch
anging
th
e
or
ientation
of th
e
LC mo
le-
cules)
by ap
plication
of an el
ectric
e
ld
. Wh
en
an LC ma
terial
wi
th
a po
sitive
∆ε is us
ed,
in th
e
o
-state,
th
e
E ve
ctor
of th
e
po
larized
li
ght
co
incides
wi
th
th
e
li
ght
ab
sorption
ax
is
of th
e
di
chroic
dy
e;
he
nce,
li
ght
is ab
sorbed
an
d
tr
ansmitted
li
ght
is co
lored
. Wh
en
a vo
ltage
is ap
plied
fo
r
th
e
on
-state,
th
e
E ve
ctor
of th
e
po
larized
li
ght
is or
thogonal
to th
e
ab
sorption
ax
is
of th
e
dy
e;
he
nce,
no ab
sorption