Jon,
First of all I am talking about EL lighting.
While it is true that EL lighting can be fairly bright, this application
needs a strong backlight for the following reason:
The LCD display in the Newt has a partially transmissive coating on the back
that provides an even background field.
The light must be bright enough to pass through this layer and still have
enough energy to be useful.
Not only that, but the added touch screen cuts the light down even more!
I would estimate that 40-50% of the available light never makes it to the
outside world.
Sidebar: Those users that think that blue would be a cool color may want to
think again. You can certainly get EL lighting in this color but it would be
sooo hard to see.
Anyway, the experiment has only just begun...
Regards,
David Humphreys,
PCB Designer
Honeywell Inc.
937-484-2331
http:/david.humphreys@honeywell.com
-----Original Message-----
From: James Simons [mailto:jesimons@mindspring.com]
Sent: Thursday, February 17, 2000 04:34a
To: NEWTONTALK
Subject: NTLK RE: backlighting
are you speaking in general terms about "white" backlighting??
because, EL and CFT are two totally different types of lighting.. the CFT
backlighting is reflected from the sides of the screen on notebooks.. and EL
backlighting is direct..
every white EL panel that i have seen, has been really bright.. not as
bright as a CFT, but, none the less, pretty bright..
j.
Date: Wed, 16 Feb 2000 07:39:20 -0700
From: "Humphreys, David" <david.humphreys@honeywell.com>
To: "'newtontalk@planetnewton.com'" <newtontalk@planetnewton.com>
Subject: RE: NTLK backlight colors (or colours)
Message-ID: <13B4F9B885F6D2119D8B0008C7590A370FE7B2@URBEX149>
Jon,
The white we are talking about is not like a floodlight but more of a soft
glow.
The contrast is much better than green.
Some of the reasons for the green backlighting are:
Longevity- Green phosphor lasts longer.
Sensitivity- The color green is at the center of the eyes peak sensitivity.
Cost- Green is marginally cheaper.
White backlighting is used in myriad notebooks, PDA's and displays.
If there was a problem you would not have such tremendous sales of these
devices.
But, if all this fails to convince you, I am also looking at a brightness
control, something that is missing from the original Newt ;)
Regards,
David Humphreys
PCB Designer
Honeywell Inc.
937-484-2331
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