Question [Q] 3/4th Screen gone black but touch is responsive

Hi I have Micromax A110 rooted Suvi V15 Custom ROM with ThunderZap v2 kernel , Everything was working fine . Just all of a sudden , when the notification sound for an incoming message rang . i saw the screen and could only see 1/4th part to the left of mobile . I saw that the 1/4th screen is same even in the boot menu , but complete screen is responsive . Could this be a software related ?? If hardware , which one is it most likely the digitiser or lcd . I had dropped the phone but not too harsh and was back 3,4 days ,since then it was working fine . Also , there was no moist or water involved . It just happened all of a sudden , it's been just more than a year purchased on Jan 1st 2013.
Any help

UPDATE: I used Droid@Screen and the projection on PC seems ok. Also , I moved back to Stock JB ROM. Even then the issue exists, So I'm presuming it should be LCD screen issue?
Attached Thumbnails
Click image for larger version

Name:	05012013014.jpg
Views:	26
Size:	252.5 KB
ID:	2496147