Re: which colour LCD C-STN/TFT/TFD?

DJ Delorie <dj@xxxxxxxxxxx> writes:

John Devereux <jdREMOVE@xxxxxxxxxxxxxxxxxx> writes:
Don McKenzie <look@xxxxxxxxx> writes:

Ajab wrote:

Why should I go for OLEDs? Are they better that TFT?

yes:
http://www.dontronics.com/oled.html
Cheers Don...

Isn't there a problem with lifetime?

Depends on the color. Based on OSRAM's specs, yellow seems to have
the longest lifetime, at 50k hours (that's 100% brightness, 100% of
the time, until it drops to 50% lumens). Other colors are as low as
10k hours, or just over a year. Note that this is a fundamental of
LEDs themselves, not just OLEDs, but you only really notice the
problem when it appears as "burn-in" on the display.

50k hours is equivalent to most industrial CCFL LCD backlights -
although you can change those!

I think one of the OLED application notes I saw gave a lifetime
*assuming a certain percentage* "on" time - so you have to be careful
to read the small print.

However, note that some oled manufacturers are dropping their display
lines. A lot of their oled matrix displays are either already
obsolete, or will be out of production soon. Check with the
manufacturer before designing them in.

It does seem like they are still very much niche products. Still much
more expensive than LCD when I last looked (a few months ago).

OLEDs also cost more than LCDs; a 2.7" 128x64 monochrome (16 levels)
display is $37 (qty 1).

If cost isn't an issue, also check out VFDs. They're even more
expensive ($165 for that size) but, like OLEDs, they're emissive vs
reflective (i.e. the elements themselves produce light, rather than
blocking a backlight like LCDs do) so "off" is *really* off, and on is
really on. This comes in handy when the display will be used in a
dark room, as you don't get the "glowing grey rectangle" effect that a
backlit LCD has.

I quite like VFD - the last time I had one was ~25 years ago in one of
the early pocket calculators. Much nicer than the later LED and LCD
displays. Funny they still have a role to play, considering the
revolution in display technology since then.

--

John Devereux
.

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