<s>
Liquid	B-General_Concept
Vapor	I-General_Concept
Display	I-General_Concept
(	O
LVD	O
)	O
is	O
a	O
type	O
of	O
display	O
system	O
and	O
is	O
especially	O
considered	O
in	O
economical	O
display	B-Device
technologies	I-Device
.	O
</s>
<s>
As	O
the	O
refractive	O
index	O
of	O
vapor	O
is	O
approximately	O
1	O
,	O
there	O
is	O
a	O
discontinuity	O
established	O
at	O
the	O
interface	O
between	O
the	O
front	O
glass	O
plate	O
and	O
the	O
liquid	O
,	O
this	O
causes	O
the	O
incoming	O
light	O
to	O
scatter	O
before	O
reaching	O
the	O
black	O
background	O
,	O
thus	O
making	O
it	O
a	O
simple	O
display	B-Device
device	I-Device
.	O
</s>
