06-18-2017, 06:22 AM | #1 |
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Infrared touch screen
Hi!,
Infrared touch screen can effect your eye in any way? I understand that Infrared light is the predominant carrier of the energy delivered to us by the Sun and that the infrared leds on an ereader are small, but in this case we look directly at the screen. I have read that IR can cause eyes problems like cataracts for ex. What is the IR emissions of a single led? and how many LEDs are there in a screen? Last edited by newday07; 06-18-2017 at 06:27 AM. |
06-18-2017, 06:32 AM | #2 |
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The IR touch beams aren't aimed at your eye, they're aimed across the screen.
The sorts of levels of radiation that cause cataracts are massive - hence the moniker "glassblower's cataract". However, glassblowers were exposed to a wide spectrum of radiation (and toxins), not just infrared, so it's not at all clear that even those huge doses of IR were causative. Your best bet when it comes to reducing your risk of cataracts is to not smoke, and always wear good sunglasses & a hat outside. Or don't get old. That works too. |
06-18-2017, 07:18 AM | #3 | |
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What do you mean by "across the screen"? I bought a Tolino ereader and I noticed that the screen is infrared and not capacitive as my Kindle ereader, that's why I asked. Where can I find the data on the emissions of these led? Last edited by newday07; 06-18-2017 at 07:24 AM. |
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06-18-2017, 08:08 AM | #4 | |
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What you're worrying about is a non-problem. |
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06-18-2017, 08:08 AM | #5 |
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It means that the beam runs parallel, and not perpendicular, to the screen. The input to the screen is given when something physical interrupts the beam.
The front light works in the same way, across the screen, and that's why your eyes won't get as tired as with a LCD screen. |
06-18-2017, 08:47 AM | #6 | |
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I understand that the infrared is not directed to the eyes, but no one has made any tests? To work so efficiently I think the emission should be high, or am I wrong? |
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06-18-2017, 08:58 AM | #7 | ||
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You're surrounded by radiation. Some of it is infrared. The vast, VAST majority of IR you're exposed to comes from the big ball of burning gas in the sky. Then there's light-bulbs, toasters, heat lamps, remote controls, etc etc etc. Quote:
Last edited by meeera; 06-18-2017 at 09:13 AM. |
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06-18-2017, 09:13 AM | #8 |
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You would have to be reading way too close to the screen, like your eyeball almost touching it, to intercept the path of the IR emission. IR emissions, like any other light emission, travels only in a straight line. It can be bent by refraction or reflection, but it still follows a straight line when it is no longer being bent. There is a sheet of black IR transmissive plastic that bends the IR at its edges and directs it across the screen.
Luck; Ken |
06-18-2017, 09:20 AM | #9 | |
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Last edited by newday07; 06-18-2017 at 09:22 AM. |
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06-18-2017, 09:33 AM | #10 | |
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Luck; Ken |
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06-18-2017, 09:43 AM | #11 |
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you are wrong, ir and uv are different things. We need a few minutes of UV exposure per day to synthesize vitamin D.
Last edited by newday07; 06-18-2017 at 09:49 AM. |
06-18-2017, 10:18 AM | #12 |
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Slightly more than half of the total energy from the Sun was eventually found to arrive on Earth in the form of infrared. If we are not outside enough for those "few minutes", then being outside for a healthy level of UV exposure would certainly involve a greater exposure to IR.
Not to mention the contribution IR makes to holding back Ice Ages. Luck; Ken Last edited by Ken Maltby; 06-18-2017 at 10:21 AM. |
06-18-2017, 11:22 AM | #13 | |
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So while you are getting that UV exposure each day, make sure you are wearing a good pair of UV opaque sunglasses. |
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06-18-2017, 11:47 AM | #14 |
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The touchscreen IR is not always-on (it's a protocol of on-off) and entirely too weak to be visible. For most IR applications you can "see" it with a digital camera (e.g. Wii Sensor Bar, find dozens of videos of that on youtube) but with the IR touchscreen... there's just nothing. That's also why IR touchscreen problems are so incredibly hard to pin down, no way to verify where things are going wrong. If someone managed to catch one of those ereader IR emitters doing anything on camera, I missed it.
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06-18-2017, 11:50 AM | #15 | |
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How many LEDs are there in an ereader? Did you consider the exposure time? |
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