The iPad has an automatic brightness feature. This feature changes the iPad screen based on the ambient light. Sometimes this isn’t enough to get the screen just right. Here are a few ways to adjust the brightness of your iPad screen.
The iPad Control Center is a convenient way to adjust a variety of settings, no matter what app you have open. Here's how to use it:
Open the Control Center by swiping down from the top-right corner of the screen.
The brightness controls are one of two vertical sliders, along with the volume control. Move the slider up and down to adjust the brightness.