In this article we will introduce a Light Emitting Diode (LED) lighting diffuser plate which diffuses light by
optical microstructure. In LED lighting, LED array is the most popular method to attain the illuminance requirement,
but this method will produce the glaring and non-uniform illuminance problems. Traditionally, diffuser, which is
comprised of diffuser particles, is used to solve the above problems, but it also produces another problem which is low
lighting efficiency. Therefore, we use optical microstructure to replace the diffuser particles to solve the problems of
LED lighting but only reduce a little lighting efficiency. Moreover, we could control the lighting area of the LED lamp
by designing the optical microstructure.
In this Letter, the identification device disclosed in the present invention is comprised of: a carrier
and a plurality of pseudo-pixels; wherein each of the plural pseudo-pixels is formed on the carrier
and is further comprised of at least a light grating composed of a plurality of light grids. In a
preferred aspect, each of the plural light grids is formed on the carrier while spacing from each
other by an interval ranged between 50nm and 900nm. As the aforesaid identification device can
present specific colors and patterns while it is being viewed by naked eye with respect to a
specific viewing angle, the identification device is preferred for security and anti-counterfeit
applications since the specific colors and patterns will become invisible when it is viewed while
deviating from the specific viewing angle.
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