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 <[email protected]>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 > > _______________________________________________ > Qi Hardware Discussion List > Mail to list (members only): [email protected] > Subscribe or Unsubscribe: > http://lists.en.qi-hardware.com/mailman/listinfo/discussion > -- Felix
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