In normal use il shuts down the backlight of the screen after some minutes, but, with a strong light in the room, you can still see that the screen is working.
Windows dims the display first, then turns it off later. If you wait a few more minutes, the screen will turn off completely.
It is definitely desirable to turn the screen completely off when not in use because even without the back-light, the video-adapter is still using power to render the screen, so turning the display off completely helps save even more power.
You can adjust the setting as desired:
- Open the Control Panel
- Select Power Options (figure 1)
- Click Change plan settings (figure 2)
- Click Change advanced power settings (figure 3)
- Scroll down to Display and expand the branch
- Expand the
Dim display and
Turn off display branches
- Adjust the values as appropriate (figure 4)
- You can also change them for the other power-plans (figure 4, orange)
Figure 1: Power Options in the Control Panel
Figure 2: Power Plans
Figure 3: Power Plan Settings
Figure 4: Display Options