This is interesting. It seems there are two different screen manufacturers for the HTC Sensation LCD panel.
One is Sharp and the other is AUO. It seems the Sharp panel has better image quality but worse viewing angles, and the AUO panel has decent viewing angles but a more grainy and inferior image.
To find out what type of screen you have, download Terminal Emulator from the Android Market, restart your phone (so it has less processes running, etc) load up Terminal Emulator and type -
dmesg
Then look for something similar to -
<6>[ 9178.895111] Panel Type = PANEL_ID_PYD_ ??????
???? = Sharp/AUO
The easiest thing to do is get the results up, press the menu button, email it to yourself and search on the computer/email client
Mine is a Sharp panel and as I've said already, other than the viewing angles I'm very impressed with it. The majority seem to be Sharp panels so far over at
XDA.