Register Guidelines E-Books Search Today's Posts Mark Forums Read

Go Back   MobileRead Forums > E-Book Readers > Amazon Kindle > Kindle Developer's Corner

Notices

Reply
 
Thread Tools Search this Thread
Old 09-23-2012, 01:16 PM   #1
jetfin
Enthusiast
jetfin has a complete set of Star Wars action figures.jetfin has a complete set of Star Wars action figures.jetfin has a complete set of Star Wars action figures.jetfin has a complete set of Star Wars action figures.jetfin has a complete set of Star Wars action figures.
 
Posts: 34
Karma: 434
Join Date: Apr 2010
Location: Zagreb, Croatia
Device: KPW, K3, K2i, K2US
[KPW] change lighting color?

I realize it's probably a bit premature since nobody has a KPW yet and no "teardown" has been done, but I figure it might be worth talking about already:

The new lighting system is LED which is then fed into the nanoimprinted light guide (basically a flattened out fiber optic cable).

Could it be possible to hack the LED to produce a different light spectrum? (either hw or possibly even sw?). I know that some LED lights that can change colors just have this done at the semiconductor chip level, effectively enabling multiple colors on one led. So maybe it could be possible to physically hack the led electronics to produce a different color (ie, swap out the chip for a differently programmed one?) or could it even be possible to do this only through a software hack?

I would prefer a light color in the more amber part of the spectrum for nighttime reading. In fact, right now I have a battery operated led clip light I use for reading that only produces amber colored light -it is much more comfortable for nighttime reading than white light and also bothers other (possibly sleeping) people much less.

I know we'll have to wait for a proper teardown of the KPW to talk more realistically about this, but I'm guessing some of you out there have a better grasp on current led lighting technology than myself and may be able to provide some theoretical input to this potential KPW light hack?
jetfin is offline   Reply With Quote
Old 09-23-2012, 03:27 PM   #2
giorgio130
Time Waster
giorgio130 ought to be getting tired of karma fortunes by now.giorgio130 ought to be getting tired of karma fortunes by now.giorgio130 ought to be getting tired of karma fortunes by now.giorgio130 ought to be getting tired of karma fortunes by now.giorgio130 ought to be getting tired of karma fortunes by now.giorgio130 ought to be getting tired of karma fortunes by now.giorgio130 ought to be getting tired of karma fortunes by now.giorgio130 ought to be getting tired of karma fortunes by now.giorgio130 ought to be getting tired of karma fortunes by now.giorgio130 ought to be getting tired of karma fortunes by now.giorgio130 ought to be getting tired of karma fortunes by now.
 
Posts: 415
Karma: 289158
Join Date: May 2011
Device: Kobo Glo and Aura HD
I doubt that they used RGB leds for the lighting, but if that is the case, it should be pretty easy to change the color. Otherwise if they're monochrome leds it would be quite impossible...
Moreover, the technology used to diffuse light should be quite sensible to the wavelength of the radiation, so it's possible it would not work with a different color.
giorgio130 is offline   Reply With Quote
Old 09-23-2012, 06:05 PM   #3
geekmaster
Всё гениальное просто.
geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.
 
geekmaster's Avatar
 
Posts: 5,070
Karma: 6789001
Join Date: Nov 2011
Location: Щедрость не имеет пределов.
Device: *.*
Quote:
Originally Posted by giorgio130 View Post
... Otherwise if they're monochrome leds it would be quite impossible...
Moreover, the technology used to diffuse light should be quite sensible to the wavelength of the radiation, so it's possible it would not work with a different color.
Energy efficient white LEDs as used in this application are really just blue LEDs with a white phosphor coating. Replacing them would require SMT rework skills (which I have), and replacement LEDs in your choice of color that have the same component footprint and power requirements. Different colors have different requirements.

Tri-color LEDs require much more complex driving circuitry, so it is very unlikely that they would be used in this application.

White light is fairly full spectrum, so filtered narrow spectrum (single color) LEDs would work as well as white for their comparative "diffusion" (or light guide propagation) properties in the Paperwhite kindle.

Last edited by geekmaster; 09-23-2012 at 06:09 PM.
geekmaster is offline   Reply With Quote
Old 09-23-2012, 08:53 PM   #4
knc1
Embedded Cheerleader
knc1 ought to be getting tired of karma fortunes by now.knc1 ought to be getting tired of karma fortunes by now.knc1 ought to be getting tired of karma fortunes by now.knc1 ought to be getting tired of karma fortunes by now.knc1 ought to be getting tired of karma fortunes by now.knc1 ought to be getting tired of karma fortunes by now.knc1 ought to be getting tired of karma fortunes by now.knc1 ought to be getting tired of karma fortunes by now.knc1 ought to be getting tired of karma fortunes by now.knc1 ought to be getting tired of karma fortunes by now.knc1 ought to be getting tired of karma fortunes by now.
 
knc1's Avatar
 
Posts: 6,667
Karma: 5850002
Join Date: Feb 2012
Device: Too many.
The light pipe might be "tuned" to work best towards the blue end of the spectrum (away from the O.P.'s choice of Amber).

The key to it being fairly broadband is like GM quoted above - it is designed for "light diffusion" not for undistorted transmission of the light source.

I.E: Same answer as GM's - slightly different viewpoint - it will 'sort-of' work for some changes in the light source but is probably not worth the effort to implement.
knc1 is offline   Reply With Quote
Old 10-07-2012, 12:30 PM   #5
jetfin
Enthusiast
jetfin has a complete set of Star Wars action figures.jetfin has a complete set of Star Wars action figures.jetfin has a complete set of Star Wars action figures.jetfin has a complete set of Star Wars action figures.jetfin has a complete set of Star Wars action figures.
 
Posts: 34
Karma: 434
Join Date: Apr 2010
Location: Zagreb, Croatia
Device: KPW, K3, K2i, K2US
Thanks to everybody for all the answers! -I'll do a tear down when I have more time towards the end of the year and take it from there. Seems like simply adding a color "filter" might be the quickest first experiment for me. The main question I'm left with after reading your input is how effective the light guide can function with specific areas of the spectrum. I work with component level electronics at work, so the prospect of maybe changing out the led hardware is an option I'll keep open...


Cheers!
jetfin is offline   Reply With Quote
Old 10-07-2012, 01:05 PM   #6
twobob
( ͡° ͜ʖ ͡°){ʇlnɐɟ ƃǝs}Týr
twobob ought to be getting tired of karma fortunes by now.twobob ought to be getting tired of karma fortunes by now.twobob ought to be getting tired of karma fortunes by now.twobob ought to be getting tired of karma fortunes by now.twobob ought to be getting tired of karma fortunes by now.twobob ought to be getting tired of karma fortunes by now.twobob ought to be getting tired of karma fortunes by now.twobob ought to be getting tired of karma fortunes by now.twobob ought to be getting tired of karma fortunes by now.twobob ought to be getting tired of karma fortunes by now.twobob ought to be getting tired of karma fortunes by now.
 
twobob's Avatar
 
Posts: 6,552
Karma: 6021142
Join Date: Jun 2012
Location: uti gratia usura (Yao ying da ying; Mo ying da yieng)
Device: PW-WIFI|K5-3G+WIFI| K4|K3-3G|DXG|K2| Rooted Nook Touch
I must have read this thread ten times now and I've been dying to say it...

some removable stick-on gels would be pretty cool for this job


hehehe properly no-tech.

not sure about the TS value
Attached Thumbnails
Click image for larger version

Name:	gels.jpg
Views:	43
Size:	33.7 KB
ID:	93599  
twobob is offline   Reply With Quote
Old 10-07-2012, 01:06 PM   #7
geekmaster
Всё гениальное просто.
geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.
 
geekmaster's Avatar
 
Posts: 5,070
Karma: 6789001
Join Date: Nov 2011
Location: Щедрость не имеет пределов.
Device: *.*
Quote:
Originally Posted by twobob View Post
I must have read this thread ten times now and I've been dying to say it...

some removable stick-on gels would be pretty cool for this job


hehehe properly no-tech.
Or translucent spray paint...
geekmaster is offline   Reply With Quote
Old 10-07-2012, 01:08 PM   #8
twobob
( ͡° ͜ʖ ͡°){ʇlnɐɟ ƃǝs}Týr
twobob ought to be getting tired of karma fortunes by now.twobob ought to be getting tired of karma fortunes by now.twobob ought to be getting tired of karma fortunes by now.twobob ought to be getting tired of karma fortunes by now.twobob ought to be getting tired of karma fortunes by now.twobob ought to be getting tired of karma fortunes by now.twobob ought to be getting tired of karma fortunes by now.twobob ought to be getting tired of karma fortunes by now.twobob ought to be getting tired of karma fortunes by now.twobob ought to be getting tired of karma fortunes by now.twobob ought to be getting tired of karma fortunes by now.
 
twobob's Avatar
 
Posts: 6,552
Karma: 6021142
Join Date: Jun 2012
Location: uti gratia usura (Yao ying da ying; Mo ying da yieng)
Device: PW-WIFI|K5-3G+WIFI| K4|K3-3G|DXG|K2| Rooted Nook Touch
even better 3d!..

who's going to implement the first monochrome 3D algorithm
Attached Thumbnails
Click image for larger version

Name:	Top-quality-3d-glass-red-blue-3d-glasses-3D-cinema-glasses-for-3D-moive-163D-100pic.jpg
Views:	47
Size:	100.7 KB
ID:	93600  
twobob is offline   Reply With Quote
Old 10-08-2012, 09:46 AM   #9
knc1
Embedded Cheerleader
knc1 ought to be getting tired of karma fortunes by now.knc1 ought to be getting tired of karma fortunes by now.knc1 ought to be getting tired of karma fortunes by now.knc1 ought to be getting tired of karma fortunes by now.knc1 ought to be getting tired of karma fortunes by now.knc1 ought to be getting tired of karma fortunes by now.knc1 ought to be getting tired of karma fortunes by now.knc1 ought to be getting tired of karma fortunes by now.knc1 ought to be getting tired of karma fortunes by now.knc1 ought to be getting tired of karma fortunes by now.knc1 ought to be getting tired of karma fortunes by now.
 
knc1's Avatar
 
Posts: 6,667
Karma: 5850002
Join Date: Feb 2012
Device: Too many.
Quote:
Originally Posted by jetfin View Post
Thanks to everybody for all the answers! -I'll do a tear down when I have more time towards the end of the year and take it from there.
http://www.mobileread.com/forums/sho...5&postcount=12
knc1 is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Change all text color when converting? Steven630 Conversion 4 08-15-2012 08:43 AM
Change Link2SD background color giosa Sony Reader Dev Corner 0 03-01-2012 06:33 PM
Can I change the shelf color? wvcherrybomb Kindle Fire 4 02-22-2012 11:49 AM
PRS-T1 How to change the font color(darker) hfqdx Sony Reader 3 12-11-2011 05:29 AM
jswolf color change UncleDuke Lounge 0 09-22-2008 12:24 PM


All times are GMT -4. The time now is 03:14 PM.


MobileRead.com is a privately owned, operated and funded community.