RGB Leds

Branch Delay · 12-13-2018, 11:26 AM

Hi All,

Ordered a Kobo Clara HD as I really like idea idea of Comfort Light Pro. (Placebo? Probably.)

A few reviews mention that Kobo is using RGB leds to get this effect. If that is the case, it seems like it should be rather easy to modify the LED driver to change the color of the screen to any RGB combination.

As this has not been done yet, my guess is that they're actually using orange and white leds and just mixing the color.

Has anyone else looked into this and found it to be impossible (i.e. they aren't true RGB leds, all four pins aren't hooked up etc.) before I waste time reverse engineering the driver?

I haven't worked with a Kobo before, so anything else I'm missing? I'm assuming I can easily root this thing and login via ssh for development.

Cheers.

pazos · 12-13-2018, 12:51 PM

Hi and welcome to Kobo's world!

Quote:

Originally Posted by Branch Delay

my guess is that they're actually using orange and white leds and just mixing the color. Has anyone else looked into this and found it to be impossible (i.e. they aren't true RGB leds, all four pins aren't hooked up etc.) before I waste time reverse engineering the driver?

You're right, there are white and orange leds. You can change the brightness of both or change the brightness of white leds and use a mixer interface to set the colour mix. You can't change the colour of the leds themselves, they're not RGB. You can check that looking at the device, you'll see at the bezel that leds are placed: white - orange - white -orange.

Quote:

Originally Posted by Branch Delay

I haven't worked with a Kobo before, so anything else I'm missing? I'm assuming I can easily root this thing and login via ssh for development.

Sure, You won't have any problem with this. Even old instructions work fine today, but you'll probably want a modern package

BTW: Older devices, like the Kobo Aura One have green/red leds and you can experiment more with them. The attached image doesn't look exactly like the device itself, but you'll get the idea.

Cheers.

Branch Delay · 12-13-2018, 02:10 PM

Super! Thank you for saving time on that. RGB sure would have been cool, but then again I don't really need a screen that is anything other than orange/white.

jackie_w · 12-13-2018, 02:49 PM

@Branch Delay,

You might like to search this Kobo Developer's forum for threads started by NiLuJe. He's posted lot's of developer tools ported over from his Kindle work.

NiLuJe · 12-13-2018, 04:19 PM

I won't be much help on the LED front, though, never had a device with any iteration of that feature, but @pazos probably covered that

.

12-13-2018, 11:26 AM	#1
Branch Delay Connoisseur Posts: 95 Karma: 1699999 Join Date: Aug 2015 Device: Voyage	RGB Leds Hi All, Ordered a Kobo Clara HD as I really like idea idea of Comfort Light Pro. (Placebo? Probably.) A few reviews mention that Kobo is using RGB leds to get this effect. If that is the case, it seems like it should be rather easy to modify the LED driver to change the color of the screen to any RGB combination. As this has not been done yet, my guess is that they're actually using orange and white leds and just mixing the color. Has anyone else looked into this and found it to be impossible (i.e. they aren't true RGB leds, all four pins aren't hooked up etc.) before I waste time reverse engineering the driver? I haven't worked with a Kobo before, so anything else I'm missing? I'm assuming I can easily root this thing and login via ssh for development. Cheers.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
720p rgb vs 1080p pentile displays	pmthokku	Android Devices	5	10-13-2014 09:26 AM
DR1000S flashing red + all 3 right LEDs	pjdfred	iRex	3	12-16-2010 10:29 AM
PRS-600 Experimenting with LEDs on Sony Cover/light [PRSA-CL1]	Dr. Drib	Sony Reader	6	02-05-2010 06:19 PM

12-13-2018, 02:10 PM	#3
Branch Delay Connoisseur Posts: 95 Karma: 1699999 Join Date: Aug 2015 Device: Voyage	Super! Thank you for saving time on that. RGB sure would have been cool, but then again I don't really need a screen that is anything other than orange/white.

12-13-2018, 02:49 PM	#4
jackie_w Grand Sorcerer Posts: 6,212 Karma: 16534894 Join Date: Sep 2009 Location: UK Device: Kobo: KA1, ClaraHD, Forma, Libra2, Clara2E. PocketBook: TouchHD3	@Branch Delay, You might like to search this Kobo Developer's forum for threads started by NiLuJe. He's posted lot's of developer tools ported over from his Kindle work.

12-13-2018, 04:19 PM	#5
NiLuJe BLAM! Posts: 13,478 Karma: 26012494 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	I won't be much help on the LED front, though, never had a device with any iteration of that feature, but @pazos probably covered that .

Advert

Advert