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Polarized light emitting device

A technology of light-emitting devices and light polarization, which is applied in semiconductor devices, electrical components, circuits, etc., and can solve problems such as insufficient

Active Publication Date: 2010-09-15
LUMILEDS HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Even though the system disclosed in US 2006 / 0066192 A1 gives increased polarization efficiency, this is not sufficient for many applications

Method used

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Embodiment Construction

[0031] exist figure 1 , the basic principle of the polarizing element is shown. The propagating light waves shown are incident on the polarizing element 4 . This light wave, which does not have a specific polarization state indicated by the solid and dashed lines, is transmitted through the polarizing element 4 . However, only a portion of the light wave having a certain polarization state is transmitted, as shown by the solid line. Other parts of this light wave are reflected back or absorbed by the polarizing element 4 .

[0032] Such as figure 1 As shown, the polarizing element 4 is a grating with a plurality of slits arranged in parallel. The grating period is smaller than the wavelength of the light wave. Such polarizing elements are known as wire grid polarizers. Wire grid polarizers typically consist of small strips of metal, such as aluminum, separated by air or a dielectric material. The grating period is typically on the order of 100-200 nm. A typical duty ra...

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Abstract

The present invention relates to a light emitting device, comprising: an LED die (10) having a first surface (12), a second surface (14) and at least one side facet (16) connecting the first and the second surface (12, 14). Further, the LED die comprises a light polarizing layer (20), a light blocking layer (30), and a light reflecting layer (40). The light polarizing layer (20) is arranged on the first surface (12), the light blocking layer (30) is arranged on the at least one side facet (16), and the light reflecting layer (40) is arranged on the second surface (14) of the LED die.

Description

technical field [0001] The present invention relates to a light emitting device comprising an LED die having a first surface, a second surface and at least one side facet connecting the first surface and the second surface. Further, the LED die includes a light polarizing layer, a light blocking layer and a light reflecting layer. The invention also relates to methods for providing polarized light from such LED dies. Background technique [0002] Solid-state light-emitting diodes (LEDs) have a bright future for replacing traditional light sources in a variety of lighting applications. More specifically, high-brightness inorganic LEDs are entering markets such as automotive lighting, camera flashes, display projection, and display backlighting. [0003] The advantages of using these LEDs to replace traditional light sources are their small size, high brightness and high color saturation. [0004] However, as conventional light sources, LEDs emit unpolarized light, ie, ligh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/00H01L33/44H01L33/46H01L33/50
CPCH01L33/44H01L33/50H01L33/46
Inventor H·J·B·加特C·C·S·尼科尔
Owner LUMILEDS HLDG BV
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