The wallpaper image appears behind all your app icons so you have something interesting to look at rather than just a blank screen. To customize the appearance of your wallpaper, you can adjust the brightness or just choose a new image altogether.
The wallpaper on your iPad is meant to provide an interesting image to look at, but if it seems too light or too dark, you can always modify this brightness by following these steps:
From the Home screen, tap Settings. The Settings screen appears.
Tap Brightness & Wallpaper. The Brightness & Wallpaper settings screen appears, as shown in Figure 6-3.
Drag the Auto-Brightness slider left or right.
(Optional) Tap the Auto-Brightness on/off switch. When ...