Which of the following features of a laptop display influences the battery life of the laptop?

Display brightness directly correlates with the power consumed by the screen's backlight. A brighter display requires more energy from the battery, leading to a shorter battery life, making reducing brightness a common way to extend laptop battery runtime.

Resolution, while affecting the number of pixels, has a comparatively minor impact on battery life compared to brightness, as the power consumption is more related to illuminating the pixels rather than their count.

Contrast settings adjust the difference between the lightest and darkest areas of the screen; it typically has a negligible impact on overall power consumption compared to brightness.

Aspect ratio describes the proportional relationship between the width and height of the display and has no direct influence on the power consumption or battery life.