Large-angle diffusing optical lens

Abstract

The invention discloses a large angle diffusing optical lens which is in rotational symmetry along a central axis. The optical lens is arranged above an optical source, the center of the optical lens and an optical source center are located on the same axis, the optical lens comprises a bottom surface, an arc light emitting surface and a light incoming surface with an arc concave middle, the arc light emitting surface is connected with one end of the bottom surface, the light incoming surface is connected with the other end of the bottom surface, the bottom surface is an annular concave curved surface which is connected with the arc concave light incoming surface, and a light diffusion structure is arranged on the annular concave curved surface of the bottom surface. According to the large angle diffusing optical lens, the light diffusion structure is arranged on the annular concave curved surface of the bottom surface so that light on an optical source receiving board can be uniformly distributed; the problem that bright rings are produced on a receiving surface due to packaging tolerance produced during packaging of the optical lens and the optical source can be prevented, and packaging tolerance requirements can be reduced; and the light diffusion structure can be arranged on the light emitting surface so that light on the optical source receiving surface can be uniformly distributed, and the problem of local bright rings on the optical source receiving surface can be solved.

Description

technical field [0001] The invention relates to a lens structure, in particular to a light-emitting device applied to a large-angle light-emitting device, in particular to a large-angle diffused optical lens in a backlight module using a dot-matrix backlight source. Background technique [0002] At present, the liquid crystal module used in the flat panel display mostly adopts the TFT-LCD (thin film field effect transistor LCD) technology. TFT-LCD is a non-active light-emitting display. Usually, a white backlight module (Backlight Module) provides uniform system brightness, and then a color filter (Color Filter) is used to obtain rich color display. [0003] like figure 1 As shown, the existing white light direct type backlight module includes a light source and an optical film set 6 . Light-emitting diode 4 (LED) has become one of the light sources used in the backlight module of liquid crystal display due to its small size and low energy consumption; LED4 is a Lambertian...

AI Technical Summary

Problems solved by technology

However, when the above structure is adopted, the processing accuracy of the secondary lens is very high. When the accuracy deviation is greater than 0.01mm, a bright circle will be generated; and because the reflected light on the bottom surface is concentrated near the central axis, when the design of the central surface is slightly deviated or When the processing accuracy is slightly deviated, it is very easy to appear a bright circle near the central axis, making the light distribution uneven

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