The Power Options control these functions. To access this screen on a Windows laptop click on the battery icon and choose POWER OPTIONS. This will give you a screen with many pre-programmed power options, and a radio button will show you which option your system is currently using. Click on the CHANGE PLAN SETTINGS link for your current option. You will see the screen shown here.
There are four factors that can be adjusted to optimize the usage of power: dimming of display, display on or off, computer on/off, brightness of display. The first three factors can be set to activate at different times. The fourth factor is a global setting and in effect whenever the computer is on.
In this example, if the laptop is running on battery the display will dim after 2 minutes of inactivity, the display will turn off after 5 minutes of inactivity, and after 15 minutes of inactivity the laptop will go to "sleep" mode and appear to be turned off. The current setting is to have maximum brightness for the monitor. If this user adjusted their display brightness to a lower level, they would conserve battery power whenever the laptop is in use. If the laptop is plugged in, the durations are set for a longer period of time as there is less concern about battery utilization/depletion.