Abstract
A new optical film is proposed to reduce angular color shifts of liquid
crystal displays (LCDs). The film is composed of microstructures to induce
the angular light mixing by deflection and reflection at the microstructure
surfaces. A simulation scheme was developed to predict color shifts based
on geometrical optics, and applied to design and optimize the microstructures.
Among various microstructures studied, parallel grooves with parabolic cross
sections were found to be the most efficient in redistributing light. Experimental
verification by the UV micro-imprinting method were conducted to show the
new film design can reduce the angular shifts by 50% or more for 13 primary
and secondary colors of a super-patterned vertical alignment (S-PVA) LCD,
and greatly reduce the grey inversion of twisted nematic (TN) LCDs as well.
© 2012 IEEE
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