Displays can be deceiving due to their small size. The display parameters can usually be adjusted to more closely reflect the final image quality. Perhaps your display is too bright? Also check your ISO. Maybe you need to shoot at a higher speed.
I am new to digital photography. After taking a picture my display screen gives me a whole different picture than I see once I have downloaded the images to my computer...can anyone tell me what I am doing wrong? The display shows a nicely exposed image..once downloaded I have to go into photoshop and manipulate the way to dark exposure..what am I doing wrong?