How to Adjust iPhone Contrast

Written by kaye wagner
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How to Adjust iPhone Contrast
An iPhone has an ambient light sensor that detects low light and adjusts the screen contrast. (lamp image by timur1970 from

Increasing the contrast on your iPhone will make the white appear brighter. An iPhone has an auto-adjust sensor that adjusts the screen's contrast according to how much light is in the room. If the room is dark, the screen will show less contrast, and if it is bright, it will show more. However, you may want to change this. Changing the contrast can help conserve battery life, as more contrast takes more battery power. Removing the automatic feature and changing the contrast only requires a few steps on an iPhone.

Skill level:


  1. 1

    If your iPhone is off, press down the sleep/wake button until you see the Apple logo. The sleep/wake button is a rectangular button on the top right of the iPhone.

    If your iPhone is locked, press the sleep/wake button, and drag the unlock slider across the screen.

  2. 2

    Tap the "Settings" button, which is grey and shows several gears.

  3. 3

    Tap the brightness button, and drag the slider to adjust the contrast. This will automatically turn "Auto-brightness" off. You can also turn off auto-brightness manually by tapping off the auto-brightness button that will appear when you select brightness. A brighter screen will show more contrast, and a dim screen will show less contrast.

Tips and warnings

  • This tutorial is for the iPhone OS 3 and 4.
  • Mac designers created the auto brightness function to conserve the iPhone's battery power, according to the iPhone user manual. Use the auto-brightness settings to conserve the battery power.

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