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FS#5220 - LCD Brightness

Attached to Project: Rockbox
Opened by E (Alveryx) - Sunday, 23 April 2006, 22:56 GMT+2
Task Type Feature Requests
Category LCD
Status Closed
Assigned To No-one
Player Type iPod 5G
Severity Low
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 0%
Private No

Details

The ability to dim the LCD to whatever brightness I want would not only save my eyes at night, it would also save battery I imagine. It can't possibly be very hard, if the LCD can currently fade away, why can't it just permanently be at a lower brightness setting.
This task depends upon

Closed by  Björn Stenberg (zagor)
Monday, 29 January 2007, 14:27 GMT+2
Reason for closing:  Out of Date
Additional comments about closing:  Closing all feature requests.
Comment by Dominik Riebeling (bluebrother) - Sunday, 23 April 2006, 23:05 GMT+2
Fading is done by PWM, i.e. fast switching between on and off state. This consumes even more power so I don't think this is a feasible option.
Comment by Paul Louden (darkkone) - Monday, 24 April 2006, 10:10 GMT+2
I love "It can't possibly be very hard" style requests. But yes, as was said, it requires to boost the CPU to dim the backlight, so having it dimmed would in all likelihood use more power than having it fully bright.
Comment by Ralf Herz (herz42) - Monday, 24 April 2006, 23:29 GMT+2
I think I remember that somebody said backlight fading doesn't need boosting on all players.
Anyhow it might still save power, as the backlight current is quite high (at least on ipod video).

But the main advantage would be the selectable brightness. The only thing I don't know is if backlight pwm could reduce lifetime if backlight is always-on.

Maybe I'll have a look at it, as the ability to reduce brightness was one of the main reasons, why I switched to rockbox.

Ralf

Comment by Ralf Herz (herz42) - Wednesday, 26 April 2006, 00:18 GMT+2
ok, a patch for ipod 5g is here
http://www.rockbox.org/tracker/task/5234
Comment by E (Alveryx) - Wednesday, 26 April 2006, 00:42 GMT+2
Wow, thats a relatively fast response I think. Thanks a lot, Ralf!

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