Brightness enhancing film and film based diffuser for improved illumination uniformity of displays
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United States of America Patent
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Apr 7, 2015
Grant Date -
Feb 17, 2011
app pub date -
Feb 13, 2009
filing date -
Feb 15, 2008
priority date (Note) -
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Abstract
An optical device has a first film (200) that has a first side and a second side. When illuminated by light (204) at the first side, the first film is characterized by a first fraction of broadly diffused transmitted light (206) and a second fraction of narrowly diffused transmitted light (208). A second film (202) is disposed to the second side of the first film. The second film has at least one free surface that diverts light. In some embodiments, the first film has a diffuse scattering optical density between 0.5 and 3. The device finds use in spreading and making light uniform in a backlight in a display such as a liquid crystal display.
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