If you guys are experiencing this flickering LCD on your Mini or when you go to an area which has a bright light, the screen of your Xperia Mini will be brighter, too and gets dim if you are in a dark area, well, you've come into the right place.
We.. the dilemma that you are experiencing is called auto brightness - a built-in feature which has a major impact on viewability, readability and even on the display or image quality. It helps us to prevent from eye strain and headaches caused by too bright or too dim level of lighting.
If you want this feature off from your phone, well, you can find the answers from the Google Play Store. Yup, the answer's in your smartphone already.