Xperia z1 compact screen brightness change itself even auto brightness is disable.

xperia z1 compact brightness change itslef even when i have turned off the auto brightness. for example, the brightness becomes dimmer when the overall display colour is dark or black colour and it becomes brighter when the ovrall display colour is white or bright colour. i mean im able to notice there is a slight change in display brightness when im viewing photo, watching videos or surfing inernet. the brightness just change itself even when i turn off the auto brightness.

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This sounds like the optimized backlight that the phone uses. See the following topic for more information:
http://talk.sonymobile.com/t5/Xperia-Z1-Z1s/Last-page-of-the-app-drawer-is-dimmer/m-p/682661#M25753
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Hi @Ssendol
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Can someone explain how this works?
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Hello Geoffery Stone,
Thank you for using Apple Support Communities!
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Xperia z1 compact screen brightness change itself even auto brightness is disable.

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