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For your reference, here are several factors of this phenomenon:
1. The screen's brightness and contrast are influenced by the ambient light conditions. When there is strong ambient light, the screen seems darker in comparison;
2. The Redmi Pad Pro comes with an Auto brightness feature that reduces screen brightness based on the detected ambient light levels automatically. If the indoor lighting is bright, the screen's brightness will automatically decrease to reduce glare and conserve battery, making the display appear darker;
3. In brightly lit environments, reflections and glare on the screen can make the display seem dimmer, even if the brightness is set to a high level.
To address these issues, you can manually adjust the screen brightness in the settings or disable Auto brightness to better suit your lighting conditions.