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Is that true of modern e-readers? My original Kindle was a gray background on gray text dark mess, but Kindle White uses LEDs at the screen edge directed throu

Is that true of modern e-readers? My original Kindle was a gray background on gray text dark mess, but Kindle White uses LEDs at the screen edge directed through a light guide to come from behind the text. Not that most people don't just use the Kindle app on an OLED or LCD screen smartphone nowadays anyway. Considering e-readers unlighted at this point would be like considering handheld games unlighted because the original Gameboy wasn't.

marvindanig 7y ago
> through a light guide to come from behind the text. What does that even mean? The nature and the underlying physics of the light hitting the cornea of your eye doesn't change or depend on how or where the rays of light originated. I know a lot of e-reader folks try and upsell 'behind the text' but that's not how it works. Light always has to reflect or radiate off of a surface from the front.
- yorwba 7y ago
  It's a description of the mechanism that delivers light of unchanged nature and physics to your eyes.
  - marvindanig 7y ago
    Unfortunately that's not how the delivery mechanism on a Kindle works. Actually light doesn't work that way for any object in the Universe–let alone e-readers. 8k+ in karma and you shouldn't be promoting nonsense on this forum.
- 0xffff2 7y ago
  >Light always has to reflect or radiate off of a surface from the front. And in the case of the Kindle, the light reflects off of the pigment layer from above, rather than radiating directly from a light source behind the pigment layer. GP's comment just contains what amounts to a typo. The light guide is in front of the text, not behind it.
  - marvindanig 7y ago
    It's not a typo. The promotion is intentional. Have seen it an umpteen number of times before and those pinched by it are also downvoting their hurt with it. ;-) Thanks for your explanation though.
tzs 7y ago
The light on the Kindle does not come from behind the text. The lightguide is in front of the text. It directs the light from the edge LEDs down, where it reflects off the text and back up through the lightguide out to your eyes. Here is a detailed tear down of the Kindle optical system: https://arxiv.org/abs/1605.05174 https://arxiv.org/abs/1605.05174
- solarkraft 6y ago
  I clicked on the article hoping for information on how e-ink displays are illuminated and was (not unsurprisingly) disappointed, but this paper absolutely saves it. It's pretty cool to see how they did it and thinking about how it could maybe be DIYed. Do you happen to know whether anyone has attempted such a thing before? I'm not totally clear about the chance of success here, but the 2 main components, clear plastic and a roughed up surface, seem generally DIYable. I very uncertain about the quality, however (since I'm not sure what exact shape the rough spots need to have, I'm basically limited to whatever a laser can make). My greatest fear is that the light won't actually go down onto the screen, but directly into the user's eyes, I guess.
the_af 7y ago
> My original Kindle was a gray background on gray text dark mess That was the best tech in my opinion though, closer to how a book works. A backlight makes my eyes tired, and I definitely don't want to use a Kindle app on an LCD display, what would be the point?
- dagmx 7y ago
  Kindles don’t use a backlight. They are semi front illuminated, more like shining a light on your book. The light can also be turned off
  - ComputerGuru 7y ago
    Yes, a much better version of the “light” in those classic “indestructible” Casio watches.
  - thaumasiotes 7y ago
    I still find the unlit or separate-booklight-lit grey kindle to be a lot easier to read than a self-lit white kindle. And while a current kindle's light can be turned off, you control the light through the touchscreen interface, so if you have the light off and it's dark, you have no hope of turning it on, so you have to just always leave it on. It's a really stupid system.

marvindanig 7y ago

> through a light guide to come from behind the text. What does that even mean? The nature and the underlying physics of the light hitting the cornea of your eye doesn't change or depend on how or where the rays of light originated. I know a lot of e-reader folks try and upsell 'behind the text' but that's not how it works. Light always has to reflect or radiate off of a surface from the front.

yorwba 7y ago
It's a description of the mechanism that delivers light of unchanged nature and physics to your eyes.
- marvindanig 7y ago
  Unfortunately that's not how the delivery mechanism on a Kindle works. Actually light doesn't work that way for any object in the Universe–let alone e-readers. 8k+ in karma and you shouldn't be promoting nonsense on this forum.
0xffff2 7y ago
>Light always has to reflect or radiate off of a surface from the front. And in the case of the Kindle, the light reflects off of the pigment layer from above, rather than radiating directly from a light source behind the pigment layer. GP's comment just contains what amounts to a typo. The light guide is in front of the text, not behind it.
- marvindanig 7y ago
  It's not a typo. The promotion is intentional. Have seen it an umpteen number of times before and those pinched by it are also downvoting their hurt with it. ;-) Thanks for your explanation though.

tzs 7y ago

The light on the Kindle does not come from behind the text. The lightguide is in front of the text. It directs the light from the edge LEDs down, where it reflects off the text and back up through the lightguide out to your eyes. Here is a detailed tear down of the Kindle optical system: https://arxiv.org/abs/1605.05174 https://arxiv.org/abs/1605.05174

solarkraft 6y ago
I clicked on the article hoping for information on how e-ink displays are illuminated and was (not unsurprisingly) disappointed, but this paper absolutely saves it. It's pretty cool to see how they did it and thinking about how it could maybe be DIYed. Do you happen to know whether anyone has attempted such a thing before? I'm not totally clear about the chance of success here, but the 2 main components, clear plastic and a roughed up surface, seem generally DIYable. I very uncertain about the quality, however (since I'm not sure what exact shape the rough spots need to have, I'm basically limited to whatever a laser can make). My greatest fear is that the light won't actually go down onto the screen, but directly into the user's eyes, I guess.

the_af 7y ago

> My original Kindle was a gray background on gray text dark mess That was the best tech in my opinion though, closer to how a book works. A backlight makes my eyes tired, and I definitely don't want to use a Kindle app on an LCD display, what would be the point?

dagmx 7y ago
Kindles don’t use a backlight. They are semi front illuminated, more like shining a light on your book. The light can also be turned off
- ComputerGuru 7y ago
  Yes, a much better version of the “light” in those classic “indestructible” Casio watches.
- thaumasiotes 7y ago
  I still find the unlit or separate-booklight-lit grey kindle to be a lot easier to read than a self-lit white kindle. And while a current kindle's light can be turned off, you control the light through the touchscreen interface, so if you have the light off and it's dark, you have no hope of turning it on, so you have to just always leave it on. It's a really stupid system.