From nookDevs

An iPhone has an ambient light sensor that notes low light also adjusts the screen contrast.

Expanding 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 the way considerably light yous in the room. If the room is dark, the screen will demonstrate less contrast, and if it yous vivid, it will exhibit more. Regardless, you may desire to transform this. Changing the contrast can help conserve battery existence, as more contrast takes much more battery strength. Removing the automatic feature also changing the contrast only entails a few steps on an iPhone.

Trouble: Simple

Instructions

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

2 Tap the "Settings" button, which is gray and displays a couple of gears.

3 Tap the brightness key, also drag the slider to adjust the contrast. This will automatically turn "Car-brightness" away. You can too change away auto-brightness manually by tapping away the auto-brightness button that will look while you pick brightness. A brighter screen will show more contrast, and any dim screen will show less contrast.

Tips & Cautions

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

References

Apple: iPhone Consumer Guide Apple: iPhone 4 User Guide

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