Grating and its backlight module
A backlight module and grating technology, applied in diffraction grating, optics, optical components, etc., can solve problems such as reducing the utilization rate of light energy of liquid crystal displays
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[0030] The present invention will be further described below with reference to the drawings and embodiments.
[0031] FIG. 3 is a three-dimensional schematic diagram of the grating 11 according to the first embodiment of the present invention. The grating 11 includes a base material portion 111 and a light-emitting surface 112. The substrate includes a light-incident surface 113 and side surfaces connecting the light-incident surface 113 and the light-emitting surface 112. The grating structure is an equal-period grating, and the light exit surface 112 is a stepped structure, wherein the widths of the step 114, the step 115, and the step 116 are the same. The grating 11 uses the fractional Taber effect.
[0032] Assuming n=1.52, the wavelengths of the three types of light incident at the same time during work are λ respectively b =0.45μm, λ g =0.54μm, λ r =0.63μm, the height of the three steps is h 1 =C+2.06μm, h 2 =C+3.76μm, h 3 =Cμm, where C is any positive number or 0, determin...
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