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Low profile side emission TIR lens for LED

A surface emission, part of the technology, applied in the parts, refractors, condensers and other directions of lighting devices, can solve the problem of light cannot be effectively coupled

Active Publication Date: 2013-12-04
LUMILEDS HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Side-emitting light cannot be efficiently coupled into waveguides whose thickness is less than the height of the side-emitting

Method used

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  • Low profile side emission TIR lens for LED
  • Low profile side emission TIR lens for LED
  • Low profile side emission TIR lens for LED

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] image 3 One embodiment of side emitting lens 24 is shown. Figure 4 and Figure 5 is a different view of lens 24 . Figure 6 is along image 3 A cross-sectional view of line 6-6, and Figure 7 is along image 3 Cross-sectional view of line 7-7. Figure 5 A portion of the base 14 or circuit board is shown extending below the lens 24 .

[0031] Such as Figure 6 and Figure 7 As shown in , the central portion 26 of the lens has a symmetrical vortex shape with a downward point 28 centered on the LED die 12 such that the curved surface of the vortex shape internally will substantially all The projected light of is generally reflected sideways, which is due to the LED light projecting onto the lens surface at greater than the critical angle. Some light may leak through central portion 26 , but this leakage should be less than 10% of the total light emitted by the major surfaces of LED die 12 . The outer wall of the central part 26 is cylindrical.

[0032] Die 12 may...

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Abstract

A low profile side-emitting lens for an LED die has two tiers of different waveguides radially extending out from a center side-emitting lens. An LED emits light into the center side-emitting lens, which has a curved surface that internally reflects the LED light outward approximately parallel to the top surface of the LED die. The center lens has a height of 2 mm, required for reflecting the LED light outward. Radially extending from the periphery of the bottom half of the center lens is a bottom tier of waveguides, each having a height of 1 mm, and radially extending from the periphery of the top half of the center lens is a top tier of waveguides, each having a height of 1 mm. The light output areas of the top and bottom tiers of waveguides are parallel with each other so that the 2 mm high side emission is reduced to a 1 mm side emission without reducing the emission area.

Description

technical field [0001] The present invention relates to lenses for light emitting diodes (LEDs), and in particular to very low profile lenses for side emission. Background technique [0002] LED dies typically emit light over a wide angle, typically up to 90 degrees from their central axis, which is perpendicular to the major surface of the LED die. For certain applications, such as coupling light into a thin rectangular waveguide to backlight a thin liquid crystal display (LCD), the LED has optics to emit light generally perpendicular to its central axis only at low angles. In this case, the main surface of the LED is parallel to the emitting surface of the waveguide, and the entire light-emitting portion of the side-emitting lens is within the waveguide or optically coupled to the waveguide sides. [0003] FIG. 1 is a side view of one such prior art side-emitting LED structure 10 . The LED die 12 is mounted on a submount 14 that has a top electrode that contacts a bottom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/00G02B6/42G02B17/08H01L33/60H01L33/58
CPCH01L33/58G02B19/0061G02B27/095G02B19/0071G02B19/0028G02B6/0031G02B6/0028G02B6/0021F21V5/04F21Y2115/10
Inventor S.J.比尔休曾G.W.恩格
Owner LUMILEDS HLDG BV
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