Optical thin plate and manufacture method thereof as well as backlight module

Abstract

The invention provides an optical thin plate and a manufacture method thereof as well as a backlight module, belonging to the optical field. The optical thin plate is used for receiving incident light projected by a light source and comprises a body, a plurality of reflecting structures and a plurality of Fresnel lens units, wherein the body comprises an incident light surface and an emergent light surface and has at least one refraction index (ni), i is a positive integer, the plurality of reflecting structures are arranged in the body, and two adjacent reflecting structures are at a distance (w), each reflecting structure has a thickness (t), all the Fresnel lens units are arranged on the emergent light surface, each Fresnel lens unit has a width (p) and mutually corresponds to the distance (w). When the formula j>=1 is satisfied, the incident light passes through the distance (w), and an optical path is convergent by the Fresnel lens units to finish the optimal optical effect. The optical thin plate of the invention or the backlight module using the optical thin plate can provide greater light intensity and excellent collimation capability so as to improve better optical performance.

Description

technical field [0001] The invention relates to the field of optics, in particular to an optical thin plate, a manufacturing method thereof, and a backlight module. Background technique [0002] At present, the common direct-type backlight module is mainly used for larger-sized liquid crystal displays. The biggest feature of the direct-type backlight module is that the light source device is arranged directly under the optical thin plate. see figure 1 , figure 1 Shown is a schematic diagram of a direct-type backlight module in Taiwan Patent No. I264596. The direct-type backlight module 1 includes a frame 11 , a light source device 12 , a lampshade 13 and a Fresnel lens 14 . like figure 1 As shown, after the light output from the light source device 12 , part of the light will directly enter the Fresnel lens 14 , and the other part will be reflected by the lampshade 13 and enter the Fresnel lens 14 indirectly. The Fresnel lens 14 is used to converge the optical path to pr...

AI Technical Summary

Problems solved by technology

[0004] The direct-lit backlight module 1 using the Fresnel lens 14 does not select the angle of incidence of light and the direction of light travel, so it cannot make full use of the light energy generated by the light source device 12, and cannot provide a uniform optical effect for a large-area liquid crystal panel.

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