If you notice that the screen of your Xiaomi 15 Ultra turns red or exhibits a red flash after waking up, this is due to an animation effect implemented in the phone’s software. The phone includes a transition animation that occurs when waking from sleep, and this effect can cause a brief red flash, especially at low brightness settings. The Xiaomi 15 Ultra includes a subtle animation effect designed to enhance the overall user experience during the wake-up process. This transition involves various color shifts to make the experience smoother and visually appealing. The red flash is a part of this transition and is typically more noticeable at lower brightness levels, as the phone adjusts from the sleep mode to the active state.
If the red flash is noticeable and bothersome to you, you can try increasing the screen brightness slightly.