my samsung galaxy s3 GT I9300 display went black but touch still working good. fix problem?

[AC Question]

my phone's screen have cracks on falling, but it was working well. Two days back, after charging my phone i found discoloration at small portion on the screen. after each time when i turns on my phone the discoloration spread to more area and finally the whole screen went black.

 

[belodion]

The display may need replacing.