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
