The specific display brightness settings that most significantly affect battery life include:

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Maximum Brightness: Running at the highest brightness level consumes the most power. Keeping brightness at or below the medium level can help extend battery life.
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Automatic Brightness Adjustment: This feature utilizes sensors to adjust the brightness according to ambient light conditions. While useful, turning it off and manually setting a lower brightness can save battery.
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Refresh Rate: Higher refresh rates can make the display appear smoother, but also increase power consumption. Lowering the refresh rate, if possible, can conserve battery life.
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Screen Timeout Settings: Setting a shorter timeout duration to dim or turn off the display when not in use can significantly save battery.
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Contrast and Color Settings: Bright colors often consume more power. Adjusting color settings to a more muted palette or using dark modes can also help in conserving energy.
By optimizing these display settings, users can improve the battery efficiency of AR glasses.