LCD is tough to see. Some LCDs are very difficult to view in direct sunlight. The glare off the LCD makes it almost impossible to see the images. Try creating a shadow over the LCD by using your hand to make the LCD easier to see in direct sunlight. Or, if your camera has a viewfinder, use it to frame your photos in bright sunlight, rather than using the LCD.
Some cameras allow you to set the brightness of the LCD, meaning it's possible the LCD's brightness has been turned to its lowest setting, leaving the LCD dim. Reset the LCD's brightness through the camera's menus.
It's also possible the LCD is simply dirty. Use a dry microfiber cloth to gently clean the LCD.