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an asymmetric lens

An asymmetric and lens technology, applied in the field of LED backlight, can solve problems such as uneven light distribution, low light utilization rate, and difficult light to reach, and achieve the effects of improving light brightness, reducing production costs, and enhancing light

Active Publication Date: 2016-01-20
GUANGZHOU ECHOM SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two types of lenses are used in direct-lit backlight modules to control the light path, improve the uniformity and light utilization of the backlight module, but the current effects of these two types of lenses are not ideal
Refractive lenses have a good effect in improving light utilization, but the light diffusion ability is poor, so that there are areas where light is difficult to reach between adjacent lenses in the backlight module, resulting in light shadows in the backlight
Although the reflective lens has better light diffusion ability than the refracting lens, the light utilization rate is relatively low, and the reflective lens reflects most of the light downward, and then exits through the side, leaving a vacancy in the area above the lens, which also causes light shadows in the backlight Problem, the problem of light shadow makes the backlight projection effect of the backlight module alternate between light and dark, and the light distribution is uneven
At this time, in order to make the light distribution more uniform, the general method is to leave a certain light mixing distance for light mixing, but in this way, the thickness of the display will be thicker, which will affect the appearance of the display and cannot achieve thinning. higher production costs

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0041] refer to Figure 1~Figure 2 , an asymmetric lens, including a base 1 and a lens body 2 arranged on the base 1, the lens body 2 includes a refraction component 21 located on the main axis side of the asymmetric lens for refracting light and a lens located on the asymmetric lens The reflective part 22 on the other side of the main axis is used to refract the light after total reflection. There are one first microstructure 31 for refracting and outgoing light after total reflection, and multiple second microstructures 32 for refracting and outgoing light are arranged on the reflective member 22 .

[0042] A plurality of first microstructures 31 are uniformly arranged in one or more semi-annular structures on the refraction member 21 , and a plurality of second microstructures 32 are evenly arranged in one or more semi-annular structures on the reflective member 22 .

[0043] Here, the main axis of the asymmetric lens refers to its central axis, with this axis as the bound...

Embodiment 2

[0054] This embodiment is basically similar to Embodiment 1, the only difference lies in the shapes of the first microstructure 31 and the second microstructure 32, refer to Figure 11 As shown, the shape of the first microstructure 31 is a right-angled trapezoid obtained by stretching a right-angled trapezoid, and the slope of the trapezoid is concave, and the plane opposite to the slope is connected to the first outgoing curved surface 213, that is, the first microstructure The cross section of 31 is a right-angled trapezoid whose hypotenuse is an arc, and the right-angled side is connected with the first outgoing curved surface 213 . The first microstructure 31 is further provided with an incident groove at the center of the side connected to the first outgoing curved surface 213 . refer to Figure 12 As shown, the shape of the second microstructure 32 is a block structure obtained after arc stretching, and can also be regarded as a block structure obtained by cutting a cy...

Embodiment 3

[0056] This embodiment is basically similar to Embodiment 1, the only difference lies in the shapes of the first microstructure 31 and the second microstructure 32, refer to Figure 13 As shown, the shape of the first microstructure 31 is a triangular prism obtained by triangular stretching. One of the stretching planes of the triangular prism is connected to the second side exit surface 224 , and the stretching plane is provided with an incident groove at the center. refer to Figure 14 As shown, the shape of the second microstructure 32 is a quarter sphere, the center of the quarter sphere is provided with an incident groove, and the quarter sphere includes two semicircular planes and an arch Any one of the two semicircular planes is connected to the first outgoing curved surface 213 .

[0057] Embodiments 1 to 3 only enumerate three possible shapes of the first microstructure 31 and the second microstructure 32. In practical applications, the shapes of the first microstruc...

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Abstract

The invention discloses an asymmetric lens. The asymmetric lens comprises a base and a lens main body arranged on the base, wherein the lens main body comprises a refraction component which is located on one side of the main axis of the asymmetric lens and used for refracting light and a reflection component which is located on the other side of the main axis of the asymmetric lens and used for refracting the light after totally reflecting the light; the asymmetric lens is indented towards the lens main body at the center of the base so that a semispherical incident inner cavity can be formed; a plurality of microstructures for refracting the light after totally reflecting the light are arranged on the refraction component; a second microstructures for refracting the light are arranged on the reflection component. The asymmetric lens is provided with the refraction component, the reflection component, the first microstructures and the second microstructures so that the light spot of the lens can be enlarged and evener, and therefore, the light shadow problem is eliminated, and meanwhile, the light above the lens is intensified and the overall light emergent brightness can be improved; in short, the asymmetric lens can be widely applied to the field of backlights.

Description

technical field [0001] The invention relates to the field of LED backlights, in particular to an asymmetric lens. Background technique [0002] In the direct type backlight module, the lenses used are generally two types of refraction lens and reflective lens. Reflect the light to the reflector, and then reflect the light to the diffuser through the reflector. These two types of lenses are used in direct-type backlight modules to control the light path and improve the uniformity and light utilization efficiency of the backlight module, but the current effects of these two types of lenses are not ideal. Refractive lenses have a good effect in improving light utilization, but the light diffusion ability is poor, so that there are areas where light is difficult to reach between adjacent lenses in the backlight module, resulting in light shadows in the backlight. Although the reflective lens has better light diffusion ability than the refracting lens, the light utilization rat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B3/00F21V5/04F21Y101/02
CPCF21V5/04F21Y2101/00G02B3/0043
Inventor 许美灵谢金成
Owner GUANGZHOU ECHOM SCI & TECH CO LTD