LAVA Computer MFG Inc. eSynC Product Family - Reference Manual – C03
2 Vulcan St. Toronto, ON
Tel: +1 416 674-5942
www.lavalink.com
Canada, M9W 1L2
Toll Free (US & Canada): 800 241-5282
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Screen Brightness Management
The LTM application has a configurable option to manage the screen brightness. The tablet or
mobile phone screen is a significant power consumer and heat generator within the device. If the
screen is too bright, the device may not be able to charge the battery.
Using the screen brightness management feature is recommended, however it is disabled as a
default to simplify first-time setup of new mobile device.
For a given application, the optimal screen brightness must be established by the system
designer. The LTM application can then ensure this maximum is never exceeded.
The Brightness Management feature has two windows for day and night operation. The "time 1"
is assumed to be the start of the night-time operation. The "time 2" is assumed to be the start of
the daytime operation. A brightness level can be configured for each of these time windows.
During the daytime window, selecting the lowest possible screen brightness reduces heat
generation and improves the ability to charge the battery. In many instances, a device screen
level of 85% to 90% has a minimal change to the apparent brightness compared to a level of
100%, yet significantly reduces heat generation.
During the night-time window, selecting a very low screen level reduces heat generation
dramatically. Setting a level of 15%, allows the screen to be seen. Turning the screen off during
night-time is preferred.
Reducing heat generation over the life of the tablet or mobile phone helps improve the longevity
of the battery and other internal components.
The Brightness Management feature is recommended but remains optional. The feature requires
that auto-brightness of the device is turned off, and that the time is correct on the device.
This feature requires that LTM be permitted to change system settings. The only system setting
manipulated is the screen brightness setting. This advanced permission must be selected in the
Application Information screen. If the permission is not checked when LTM is installed, the
required setup screen is presented shortly after LTM runs for the first time. If screen brightness
managed is disabled, the permission is not required.
The sample configuration file located later in this document has the following settings included:
brightness-level1-time=1:00
brightness-level2-time=6:00
brightness-level1=15
brightness-level2=85
Using these settings, at 1:00 AM the device brightness is set to 15%, and at 6 AM the brightness
is set to 85%. From 1:00 AM to 5:59, the level 1 brightness is enforced. From 6:00 AM to 00:59
AM, the level 2 brightness is enforced. If the screen brightness is manually changed, the
configured values are restored within a minute.
