A number of early iPod Touch users have complained that their iPod's screen could not properly display shades of black. The problem has been related to the bad reflective coating on the LCD display and bad quality control. The defect caused the screen to have very narrow optimal viewing angle (hard to look at the screen from the side) and also resulted in "shimmering" blacks. This screen problem was later fixed with the firmware update 1.1.1 although some still complained that the screen still could not properly display certain shades of black. Critics also say that the update simply "alleviates" the screen problem by adjusting contrast settings and does not provide a fix for the screen itself.