Currently Being ModeratedOct 1, 2013 9:12 AM (in response to BrunoX208)
Thank you for using Apple Support Communities.
From what you are describing, it sounds like the Increase Contrast option is turned on. Check in the setting to see if it is turned On. If so, then turn it Off. If not, try turning it off, then back on.
Increase text contrast on difficult backgrounds when possible. Go to Settings > General > Accessibility and turn on Increase Contrast.
From: iPhone User Guide