Ask Proxima A1100 User Manual page 19

Problem
image not square
image not sharp
A B A B
image does not fit 4:3 or 16:9 screen
Solution
adjust Keystone on keypad
adjust Sharpness in the Basic Picture menu
change aspect ratio to 4:3 or 16:9 in Basic
Picture>Aspect ratio menu
18
Result
square image
correct image
A B
correct image