Available in 11 x 11, 17 x 17, and 24.25 x 24.25 in. sizes, 3M Vikuiti™ Brightness Enhancement Films contain prismatic structures which refract light output from backlight. Light refracting prism angle is fixed at 90°, and prism pitches of 50 µm and 24 µm are available. Single 3M BEF sheet increases brightness of display by up to 60%, and placing 2 sheets at right angles to one another results in 120% increase. Flexible films adapt to wide range of substrates including glass and acrylic.