My iPhone 4 has recently started to flicker. I've changed the brightness settings and for a short period of time it was back to normal, but now it is much worse! What am I to do?

Three days ago I was trying to take a picture, but I couldn't see what I was taking because of the flickering white lines that covered the screen. But when I looked at the image after taking it, it was perfectly fine. So I knew it wasn't the camera playing up. The next day my phone wouldn't allow me to view images without the lines appearing. The following day I changed my brightness settings, and it went back to normal. But now it is much worse. No matter what I try to do the flickering lines are all over the screen! I don't know what to do. I would appreciate any help, thank you!
These images don't really show the extent of the flickering, but it may give you an idea

I'm not a fan of DFU mode because I've never seen it recommended by Apple.
First, try a system reset. It cures many ills and it's quick, easy and harmless...
Hold down the on/off switch and the Home button simultaneously until you see the Apple logo. Ignore the "Slide to power off" text if it appears. You will not lose any apps, data, music, movies, settings, etc.
If the Reset doesn't work, try a Restore. Note that it's nowhere near as quick as a Reset. Connect via cable to the computer that you use for sync. From iTunes, select the iPad/iPod and then select the Summary tab. Follow directions for Restore and be sure to say "yes" to the backup. You will be warned that all data (apps, music, movies, etc.) will be erased but, as the Restore finishes, you will be asked if you wish the contents of the backup to be copied to the iPad/iPod. Again, say "yes."
At the end of the basic Restore, you will be asked if you wish to sync the iPad/iPod. As before, say "yes." Note that that sync selection will disappear and the Restore will end if you do not respond within a reasonable time. If that happens, only the apps that are part of the IOS will appear on your device. Corrective action is simple - choose manual "Sync" from the bottom right of iTunes.
If you're unable to do the Restore, go into Recovery Mode per the instructions here.

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