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Figure 2. Automatic Brightness Control Configuration Dialog
The Automatic Brightness Control Configuration dialog (see Figure 2) is the user's primary
interface to configure the ALS environment. The dialog provides the capability to enable/disable
automatic brightness control, set two display brightness profiles, and open the Advanced
Configuration dialog. A default button is provided to reset the dialog back to the original settings.
The Configuration interface defines two display brightness profiles (i.e. two response curves) to
independently manage the lux-to-nits relationship between the current ambient light and display panel
luminance. The software provides the
profiles to be configured.
conditions. The purpose of the
(i.e. minimizing) the display luminance under equivalent ambient light conditions.
anticipated that the user will likely prefer optimal display aesthetics for some period of time when the
system is running on batteries, a pull-down menu is provide to allow the user to set the parameters of
the Batteries Profile to change from
percentage.
Effectively, the profile becomes more aggressive (i.e. by minimizing the display
brightness) as battery life becomes more "critical".
Note: The brightness range of the AC and Batteries Profile is bounded by the EVM software.
Since a "picture view" (see Automatic Brightness Control Monitor) is used to simulate the
display for a wide-range of platforms (e.g. notebooks, tablets, LCD monitors, etc.), an
approximate range of 20-140 nits was chosen to best simulate the dynamic range of the
display panel.
An Evaluation System for the TSL2560/61 Ambient Light Sensor
AC
(for external power) and the
AC
The
Profile provides optimal viewing for varying ambient light
Batteries
Profile is to extend the battery life by automatically dimming
AC
Batteries
to
profile when the power level is below a specified
4 of 11
Batteries
display brightness
Since it is
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