You need to use your iPad in the shade and crank up the brightness to 100%. There are also anti-glare screen protectors that help. You should also look into getting a dedicated e-reader (like an e-ink equipped Kindle or Nook) if you plan on reading books outside a lot. TFT, LCD, LED, AMOLED, and OLED displays weren't really made for outdoor use though OLED and AMOLED do work better (something that the iPad doesn't have).