Abstract： |
A kind of grating and its negative photo mould, it belongs to the optical fluid crystal display set technology field. To solve the problem that the light energy usage of color fluid crystal display is low, this invention discloses a kind of grating and its negative photo mould, the said grating includes incident surface, the emergent surface which is relative to the incident surface and the side which connects the incident surface and the emergent surface, the grating is isochronism grating; each period of the grating has three step, the width of each step is equal; the altitude difference choice of the grating step is to make the value of sigma1,sigma2 least. The said negative photo mould includes the light source, the light plate and the said grating; the light source is set relative to the incident surface (32) of the light plate, the said light plate, grating overlays in order; this invention uses the grating to separate the color in near field based on the color separation method of diffraction optical technology, it has realized the high-usage of light energy, solved the problem that the light energy waste is large in the negative photo system, to make the incident light of the negative light source can be used, ensure the negative light source provides high efficiency light to the fluid crystal display. |
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