Your z3 compact screen maybe damaged by dropped, i suggest you try to disassemble your z3 compact then reconnect the screen flex cable. see if the screen problem is cause by the screen flex cable loosen.
If flex cable reconnection can not fix the screen problem, then you should turn to the hardware solution: change a new screen.
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We provide the [https://www.witrigs.com/oem-lcd-with-digitizer-for-sony-xperia-z3-compact-white|original lcd screen for Sony xperia z3 compact], and also provide Sony xperia z3 compact [https://www.youtube.com/watch?v=ibb22uofq-c|lcd screen repair guide.]
Your z3 compact screen maybe damaged by dropped, i suggest you try to disassemble your z3 compact then reconnect the screen flex cable. see if the screen problem is cause by the screen flex cable loosen.
If flex cable reconnection can not fix the screen problem, then you should turn to the hardware solution: change a new screen.
We provide the [https://www.witrigs.com/oem-lcd-with-digitizer-for-sony-xperia-z3-compact-white|original lcd screen for Sony xperia z3 compact], and also provide Sony xperia z3 compact [https://www.youtube.com/watch?v=ibb22uofq-c|lcd screen repair guide.]