Quote:
Originally Posted by SteveDuck
Agreed...I should have titled this thread "trouble attempting to protect Nook STR from elements while reading"...or something like that.
I'm aware the "touch" interface is IR based, not capacitive. I suspect it detects isolated ir spikes compared to ambient levels. I'll guess the a plastic bag creates IR spikes which get detected as touch input. I was using it on a tropical beach in full sun...and strong breezes which rendered futile any attempt to draw the bag taut .
I'm curious to know if the stick on screen protectors work trouble free or causes false input problems...although this would not provide the water, salt spray 7 sand protection I desire while reading
I'm also curious to know the results of anyone's experiments with a TrendyDigital Waterguard. Perhaps a purpose built transparent enclosure would not trigger false IR input.
This whole issue could be simply addressed by B&N within software with the addition of a setup option to temporarily disable touch input & re-enabling it when the nook button is pressed. This would allow for water protected reading sessions.
I suppose the best bet is to buy the extended warranty & return device if it gets damaged...and not worry about engaging in potentially damaging behavior.
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The IR touchscreen should be relatively imune to environment IR noise. It works off of occlusion (blocking the beam), not inclusion (adding more IR info) Think of it like a grid of IR beams across the page, one beam per pixel in the X and Y axes (I'm sure it's not that accurate, but let's just work with that). If you block the IR beam from getting to its corresponding transmitter, it can figure out by math where you're touching.
But when you put it in the baggy, it ends up touching the screen in a bunch of places all at once and it has no idea what's going on.
That's a side-profile of the screen, where the red dot is a transmitter and the blue dot is a receiver. Notice that they're slightly above the screen itself, which means that thin stick-on screen protectors should not interfere with the touch functionality (lower-quality, thicker protectors very well might). The light blue outline is a cross-section of your baggy. As you can see, it dips into the IR line multiple times. Now consider that in two dimensions and it should be pretty obvious why it "broke".
Note that external IR sources like sunlight shouldn't be an issue unless you hold the nook at really weird angles (and even then it shouldn't happen, if they used properly polarized lenses on the receivers for example).