To what pressure eInk screen are meant to resist?

NiMa · 08-22-2020, 08:29 AM

The title is pretty self-explanatory.
Thanks!

Deskisamess · 08-22-2020, 08:32 AM

They don't need pressure. They are touch screens, not jab/stab/poke/push screens.

Too much pressure or twisting can mess up the layers and ruin the screen.

NiLuJe · 08-22-2020, 10:53 AM

And if you meant underwater, err, don't?

The Forma specs says IPX8, i.e., < 2m for < 1h, but, really, don't.

NiMa · 08-22-2020, 11:14 AM

Quote:

Originally Posted by NiLuJe

And if you meant underwater, err, don't?

The Forma specs says IPX8, i.e., < 2m for < 1h, but, really, don't.

No, I meant 'pressure' on the screen.

NiLuJe · 08-22-2020, 11:17 AM

Then, yeah, what @Deskisamess said. Unless it's a Forma, the TFT backplane is a thin glass layer that's very much not flexible

.

Ripplinger · 08-22-2020, 11:56 AM

I seem to remember my very first cell phone had a pressure-touch system, but those didn't last long at all. They were replaced by infrared and capacitive touch screens.

Eink screens are made entirely differently than phone screens if you're thinking that since your phone can withstand pressure, so should your ereader. Phone screens can take quite a bit of abuse, as can tablets. But as already said, eink screens are more fragile and will break if flexed even slightly from uneven pressure anywhere on the screen or any twisting motion.

JSWolf · 08-22-2020, 01:05 PM

Quote:

Originally Posted by Ripplinger

I seem to remember my very first cell phone had a pressure-touch system, but those didn't last long at all. They were replaced by infrared and capacitive touch screens.

Eink screens are made entirely differently than phone screens if you're thinking that since your phone can withstand pressure, so should your ereader. Phone screens can take quite a bit of abuse, as can tablets. But as already said, eink screens are more fragile and will break if flexed even slightly from uneven pressure anywhere on the screen or any twisting motion.

Unless you have a Kobo Forma with a plastic backed screen. But even so, I would not put undue stress on a Forma.

pdurrant · 08-23-2020, 03:36 AM

Quote:

Originally Posted by NiMa

The title is pretty self-explanatory.
Thanks!

I've fixed the title and tidied the thread.

E-Ink screens with glass substrates are much like any other glass, except that the substrate is very thin. Any point impact is likely to shatter the glass, and any twisting motion likewise.

Having said that, most recent ereaders have learned from previous designs, and are now quite robust, provided you don't do something like dropping a pointed object onto the screen, or sitting on them.

NiMa · 08-23-2020, 09:45 AM

Quote:

Originally Posted by pdurrant

I've fixed the title and tidied the thread.

E-Ink screens with glass substrates are much like any other glass, except that the substrate is very thin. Any point impact is likely to shatter the glass, and any twisting motion likewise.

Having said that, most recent ereaders have learned from previous designs, and are now quite robust, provided you don't do something like dropping a pointed object onto the screen, or sitting on them.

Thanks, that was a good answer to my question.

08-22-2020, 08:29 AM	#1
NiMa Fanatic Posts: 507 Karma: 2390534 Join Date: Jun 2020 Location: Somewhere in the Universe Device: Kobo Libra, Glo HD, Touch C/B, Mini, Glo, Aura SE, Clara HD, KT	To what pressure eInk screen are meant to resist? The title is pretty self-explanatory. Thanks! Last edited by pdurrant; 08-23-2020 at 03:32 AM.

08-22-2020, 08:32 AM	#2
Deskisamess Wizard Posts: 2,752 Karma: 45301087 Join Date: Sep 2012 Location: Ohio Device: iPhone 13 Pro, iPad mini, iPad Pro 12.9",Paperwhite 6.8", Scribe 2022	They don't need pressure. They are touch screens, not jab/stab/poke/push screens. Too much pressure or twisting can mess up the layers and ruin the screen. Last edited by pdurrant; 08-23-2020 at 03:33 AM.

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08-22-2020, 10:53 AM	#3
NiLuJe BLAM! Posts: 13,506 Karma: 26047202 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	And if you meant underwater, err, don't? The Forma specs says IPX8, i.e., < 2m for < 1h, but, really, don't.

08-22-2020, 11:17 AM	#5
NiLuJe BLAM! Posts: 13,506 Karma: 26047202 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	Then, yeah, what @Deskisamess said. Unless it's a Forma, the TFT backplane is a thin glass layer that's very much not flexible .

08-22-2020, 11:56 AM	#6
Ripplinger 350 Hoarder Posts: 3,574 Karma: 8281267 Join Date: Dec 2010 Location: Midwest USA Device: Sony PRS-350, Kobo Glo & Glo HD, PW2	I seem to remember my very first cell phone had a pressure-touch system, but those didn't last long at all. They were replaced by infrared and capacitive touch screens. Eink screens are made entirely differently than phone screens if you're thinking that since your phone can withstand pressure, so should your ereader. Phone screens can take quite a bit of abuse, as can tablets. But as already said, eink screens are more fragile and will break if flexed even slightly from uneven pressure anywhere on the screen or any twisting motion.

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