LCD viewing angle
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Posts: 46,084
Would someone please explain the viewing angle spec? BG Micro has good
deals on displays, but they quote viewing angles like "6 o'clock", and "12
o'clock".
To further confuse me, the Apollo site states viewing angle as 6.00 for some
modules.
Thanks in advance,
Ray McArthur
deals on displays, but they quote viewing angles like "6 o'clock", and "12
o'clock".
To further confuse me, the Apollo site states viewing angle as 6.00 for some
modules.
Thanks in advance,
Ray McArthur
Comments
An LCD with a viewing angle of 6 o'clock will best be used in
equpiment that's hand-held, overhead displays, etc,, Anywhere
that the LCD is most likely to be viewed from the 6 o'clock position.
One with a viewing angle of 12 o'clock, would be best used in
equipment that's viewed from above, IE,, 12 o'clock.
The physical construction of the LCD causes it to have different
viewing angles. liquid crystals are sandwiched between upper
and lower plates, they line-up with grooves. These grooves are
what causes the different viewing angles.
When no voltage is applied, light passes; when voltage is applied,
light is blocked and the screen appears black. In other words, the
voltage acts as a trigger causing the liquid crystals to function like
the shutter of a camera.
There's quite a bit more to LCD theory, but this should give you a
nominal understanding on how they work.
Regards,
Bruce
http://www.rentron.com
Original Message
From: "rjmca" <rjmca@w...>
To: "stamps parallax" <basicstamps@egroups.com>
Sent: Tuesday, June 13, 2000 10:31 PM
Subject: [noparse][[/noparse]basicstamps] LCD viewing angle
> Would someone please explain the viewing angle spec? BG Micro has good
> deals on displays, but they quote viewing angles like "6 o'clock", and "12
> o'clock".
>
> To further confuse me, the Apollo site states viewing angle as 6.00 for
some
> modules.
>
> Thanks in advance,
> Ray McArthur
>
>
>
>
>
>
good
> deals on displays, but they quote viewing angles like "6 o'clock",
and "12
> o'clock".
As Bruce said, 6 means best viewed from below; 12 from above. More
important, however, is the type of LCD. Old-style TN LCDs have a
relatively narrow viewing angle, so the 6 and 12 spec is pretty
critical. These days, TN LCDs are used mostly in cost-sensitive,
quality-insensitive apps like toys, caller-id boxes, etc.
STN displays (like those sold by Parallax and seetron.com)
have a much wider useful viewing angle, making the 6/12 almost
irrelevant.
OEM surplus LCDs can be a great bargain, but often there's a
reason someone had to liquidate them for pennies on the dollar--caveat
emptor.