You can adjust the brightness of the display for Fifth Generation iPod models (also known as iPod with video). To use this feature ensure that you have one of the following iPods and have updated to the latest version of iPod software:
To adjust the brightness of an iPod's display, select Settings > Brightness and use the Click Wheel to move the slider. Move the slider to the left to dim the screen, move it to the right to increase the brightness.
Your iPod's brightness level will have a direct impact on battery life. By lowering the brightness level, you can increase the iPod's playback time. It is possible to adjust iPod's brightness level while watching a slideshow or a video.
To adjust brightness while viewing a slideshow
To adjust brightness while viewing a video
Note: The brightness setting on the iPod only affects the iPod display. If you are viewing a slideshow or video on a television, use the brightness controls on the television instead. Within each iPod Game purchased from the iTunes Store, you can also adjust the brightness setting.