Abstract
A novel light guide plate (LGP) with sub-micron gratings (SMGs) on its upper surface is proposed to control the illumination angle and its initial structure of LGP is given. The periods of SMGs are 0.651μm, 0.516μm and 0.433μm for the LED light sources transmit out vertically with the incidence angle 45º under the total internal reflection condition. The transmission efficiencies vary between 2% and 43% when the depth of grooves of SMGs changes between 0.05 μm and 0.9 μm by using rigorous coupled-wave theory (RCWT). The results show that the LGP utilizing the characteristics of the SMGs can control the transmission angle and get homogeneous output.
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