anelok: more light

Felix sucotronic at gmail.com
Mon Sep 30 06:04:27 EDT 2013


There are few options for displays that are readable under direct sunlight:
e-paper or gray lcd. I really liked the lcd on the wikireader and used a
lot before getting my first smartphone :P


On Sat, Sep 28, 2013 at 5:44 PM, Werner Almesberger
<werner at almesberger.net>wrote:

> Last week, the sky was clear a few times and I tried to see how the
> display did (at 7.5 V) in bright midday sunlight.
>
> Exposed directly to the sun, you couldn't even tell whether it was
> on. Providing a bit of shadow with a hand made it somewhat
> readable. Then I tried the competition: two cell phones. They
> didn't fare any better.
>
> So, a clear 3:0 victory for the sun.
>
> Since a password safe isn't really a standalone device, it's
> probably okay if it's only as good as the rest of the field when
> it comes to daylight use. In any case, I think it's sufficient for
> a prototype.
>
>
> Then, I had a second look at the article about the font:
>
> http://guy.carpenter.id.au/gaugette/2012/11/11/font-support-for-ssd1306/
>
> The logo on the PCB looks familiar. And indeed, here is the board:
>
> http://www.adafruit.com/products/938
>
> The technical specs of the panel are identical to ours. Their
> circuit is slightly different, with the main difference being the
> pixel current resistor. (According to the various data sheets,
> what they have should fry their pixels, but other effects may
> conspire to effectively make the current-control resistor
> irrelevant, see below.)
>
> They also use the charge pump and I really wonder whether their
> panel (for which they say they don't have a data sheet) is really
> electrically identical to the 0.96" panel, as they claim. A quick
> search led me first here
>
>
> http://www.panelook.com/UG-2864KSWLG01_WiseChip_1.3_OLED_overview_19667.html
>
> then, a search for the data sheet,
>
> http://www.gabotronics.com/download/datasheets/UG-2864KSWLG01.pdf
>
> And this one looks like an older version of the data sheet I got
> from EastRising, also with 12 V. So my guess would be that I'm not
> the only one who's happy to operate a 12 V panel at 7.5 V :)
>
> The makers of the UG-2864KSWLG01 themselves also list this display
> in the "3.3V Supply for Embedded Charge Pump Function" category:
>
> http://www.wisechip.com.tw/english/Products_01.asp
>
> And of course, that charge pump delivers "only" 7.5 V.
>
> WiseChip with their UG-2864KSWLG01 would also be a second source,
> which is the most important result I take from all this.
>
> - Werner
>
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-- 
Felix
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