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Secondary lens with bottom of curved surface structure

A technology of secondary lens and curved surface structure, applied in the direction of condenser lens, illuminated mark, parts of lighting device, etc., can solve the problems of light intensity, uneven light distribution, etc. good diffusion effect

Active Publication Date: 2012-10-03
TPV DISPLAY TECH (XIAMEN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] like image 3 As shown, the working principle of the direct type backlight module with a secondary lens is: when light A enters the light-emitting surface 02 through the light-incident surface 011, part of the light is reflected to the bottom surface 012, and then reflected back to the light-emitting surface 02 by the bottom surface 012. Towards the central axis, causing the light intensity near the central axis to be stronger, thus making the light distribution uneven

Method used

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  • Secondary lens with bottom of curved surface structure
  • Secondary lens with bottom of curved surface structure
  • Secondary lens with bottom of curved surface structure

Examples

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Effect test

Embodiment 1

[0051] Such as Figure 5 As shown, the connection between the light incident surface 11 and the concave curved surface 12 at the bottom surface 1 is a circle of horizontal planes 5, which not only facilitates the processing of the connection between the light incident surface 11 and the concave curved surface 12, but also facilitates the bottom surface 1 and the point. Fixing of the light source 3; the connection between the light emitting surface 2 and the concave curved surface 12 at the bottom surface 1 is a circle of horizontal planes 6, so as to facilitate the processing of the connection between the light emitting surface 2 and the concave curved surface 12.

Embodiment 2

[0053] Such as Image 6 As shown, the connection between the light exit surface 2 and the bottom surface 1 at the side is a circle of vertical surfaces 7, which not only facilitates the processing of the connection between the light exit surface 2 and the concave curved surface 12, but also facilitates the side fixation of the secondary lens.

Embodiment 3

[0055] Such as Figure 7 As shown, the connection point i between the concave curved surface 12 and the light incident surface 11 is the lowest point of the bottom surface, so that the light emitted by the point light source 3 passes through the light incident surface 11, and the light source utilization rate is high.

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Abstract

The invention discloses a secondary lens with a bottom of a curved surface structure, which is rotationally symmetrical along with the central axis, comprising a bottom surface and an air light outlet surface connected with the bottom surface, wherein the air light outgoing surface is arranged above a point light source, and the bottom surface comprises a middle arc concave light inlet surface and a ring-shaped concave curved surface connected with the arc concave light inlet surface. According to the secondary lens in the invention, the bottom surface is a continuous curved surface which is formed by connecting the middle arc concave light inlet surface with the ring-shaped concave curved surface, so that the diffusion angle of the light source can be enlarged, the secondary lens is good in light ray diffusion effect, and the light ray reaching onto a receiving plate is more even; and the secondary lens in the invention is applicable to a backlight module, and is further applicable to an illumination system which needs the homogeneous diffusion effect of the light.

Description

Technical field [0001] The present invention relates to a lens structure, in particular to a light-emitting device applied to large-angle light emission, and particularly to a secondary lens with a curved bottom surface in a backlight module adopting a dot matrix backlight. Background technique [0002] At present, the liquid crystal modules used in flat-panel displays mostly use TFT-LCD (Thin Film Field Effect Transistor LCD) technology. TFT-LCD is a non-active luminous display, usually a white light backlight module (Backlight Module) provides uniform system brightness, and then through a color filter (Color Filter) to obtain a rich color display. [0003] Such as figure 1 As shown, the existing white light direct type backlight module includes a light source and an optical film set 04. Light-emitting diode 03 (LED) has become one of the light sources used in LCD backlight modules due to its small size and low energy consumption; LED03 is a Lambertian distributed light source, w...

Claims

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Application Information

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IPC IPC(8): F21V5/04
CPCG02B19/0061F21V13/04G02B19/0028G09F9/35G09F13/22
Inventor 李丽梅郑俊义林博瑛
Owner TPV DISPLAY TECH (XIAMEN) CO LTD
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