At 13:37 31 December 2011, Richard wrote:
On Dec 30, 7:10=A0pm, "PCool" wrote:
There is an interesting discussion here
athttp://www.postfrontal.com/foru=
m/topic.asp?TOPIC_ID=3D5589&whichpage=3D6
with a lot of pictures I have taken out of new PNAs with 800-
900 nits
displays.

This PNA has also a spare RS232. =A0I am searching for a
Dell Streak to
compare, but it is was gone out of production a few months
ago.
With the sun in front of us, and not in the back, brightness is
the only
help to make the screen visible at all.

I am also about to review the Holux 61CS, which is a long
awaited
unbrand=
ed
device with a very good visibility.
(I dont sell them!)

paolo

I think the following exerpt from a Gliding Internation Article
may
clear up many misconceptions that high brightness makes a
display
sunlight readable. Brightness minimually affects the sunlight
readability. Contrast ratio is the most important factor.

The Craggy Aero Ultimate Le aviation quality display sets the
standard
in sunlight readability it delivers a radically high level of screen
brightness that results in unparalleled picture sharpness and
vividness. The VHB LED backlight in the LCD module
consumes only 4.5
Watts at full brightness. The LCD screen temperature is quite
small
and there are few thermal management issues. The LCD
module displays
a VGA (640 x 480) image.
Contrast ratio is the most important factor in high and full
sunlight
applications. Contrast ratio of a display is defined as the
luminance
(brightness) ratio between a brighter state and a darker state.
The
color LCDs =93white=94 state and =93black=94 state are
used to calculate
th=
e
contrast ratio.
Contrast ratio =3D CR =3D luminance of the =93white=94
/luminance of the
=93black=94.
If white and black are equally bright, then CR =3D 1 and the
display is
not readable. Due to the coatings applied to the display the
contrast
ratio of the Ultimate Le is extremely high. The high contrast
ratio
makes the view in direct sunlight only slightly dependent on
the
backlight intensity. Even at the low backlight setting the
display
is totally readable in full sunlight. These characteristic
contribute
to the overall superior direct sunlight performance in the
cockpit.
No longer do you need to run software in the white or no
terrain mode,
the color and clarity are vibrant in full sun.

http://www.craggyaero.com/ultimate_le.htm


Richard
www.craggyaero.com

Why don't other non-touch-screen glider computer instrument
makers use the same screens as the Ultimate?

BTW - the new Butterfly vario (if it works as claimed it could be
a significant advance in variometry) + the Craggy Ultimate looks
like a great combination matching all the features of a fully
optionalised LX 9000.

John Galloway