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Packaging technique for the fabrication of polarized light emitting diodes achieved

Foreign code F110003768
File No. E06716US1
Posted date Jul 4, 2011
Country United States of America
Application number 47218606
Gazette No. 20060284206
Gazette No. 7518159
Date of filing Jun 21, 2006
Gazette Date Dec 21, 2006
Gazette Date Apr 14, 2009
Priority data
  • 2005US-60692514 (Jun 21, 2005) US
Title Packaging technique for the fabrication of polarized light emitting diodes achieved
Abstract (US7518159)
A polarized light emitting diode (LED) includes a marker indicating a polarization direction.
A package for the LED also includes a marker indicating the polarization direction.
The markers on the LED and package are used for mutual alignment, wherein the LED is attached in a favorable orientation with respect to a package, so that the polarization direction of emitted light from the package is apparent.
The marker is placed on the LED before die separation and the marker is placed on the package before alignment.
The marker on the LED comprises a photolithographic pattern, an asymmetric die shape, a notch on the die, or a scratch on the die, while the marker on the package comprises an electrode shape or pattern, an asymmetric package shape, a notch on the package, or a scratch on the package.
Finally, the LED or package may be installed in an external circuit or system that also indicates the polarization direction.
Scope of claims [claim1]
1. A polarized light emitting diode (LED) apparatus, comprising: at least one LED, for emitting polarized light, including at least one first marker indicating a light polarization direction of the LED;
and
a package, for containing the LED, including at least one second marker indicating a light polarization direction of the package;
wherein the LED is positioned within the package by aligning the first marker with the second marker.
[claim2]
2. The polarized LED apparatus of claim 1, wherein the LED is attached in a favorable orientation with respect to the package, so that the light polarization direction of emitted light from the LED is apparent.
[claim3]
3. The polarized LED apparatus of claim 1, wherein the first marker on the LED and the second marker on the package are used for mutual alignment.
[claim4]
4. The polarized LED apparatus of claim 1, wherein the first marker is placed or defined on the LED before die separation and the second marker is placed or defined on the package before alignment.
[claim5]
5. The polarized LED apparatus of claim 1, wherein the first marker on the LED comprises a photolithographic pattern, an electrode shape or pattern, an asymmetric die shape, a notch on the die, ot a scratch on the die.
[claim6]
6. The polarized LED apparatus of claim 1, wherein the second marker on the package comprises an electrode shape or pattern, an asymmetric package shape, a notch on the package, or a scratch on the package.
[claim7]
7. The polarized LED apparatus of claim l, wherein the LED is installed in an external circuit or system that utilizes the light polarization, and the external circuit or system includes at least one third marker indicating a light polarization direction of the external circuit or system, wherein the package is positioned within the external circuit aligning the second marker with the third marker.
[claim8]
8. The polarized LED apparatus of claim 1, wherein the package contains an array of the polarized LEDs.
[claim9]
9. A method of fabricating a polarized light emitting diode (LED) apparatus, comprising: obtaining at least one LED, for emitting polarized light, including at least one first marker indicating a light polarization direction of the LED;
obtaining a package, for containing the LED, including at least one second marker indicating a light polarization direction of the package;
and
positioning the LED within the package by aligning the first marker with the second marker.
[claim10]
10. The method of claim 9, wherein the light polarization direction is determined from the LED's crystallographic orientation.
[claim11]
11. The method of claim 9, wherein the LED is attached in a favorable orientation with respect to the package, so that the polarization direction of emitted light from the LED is apparent.
[claim12]
12. The method of claim 9, wherein the first marker on the LED and the second marker on the package are used for mutual alignment.
[claim13]
13. The method of claim 12, wherein the first marker is placed or defined on the LED before die separation and the second marker is placed or defined on each package before alignment.
[claim14]
14. The method of claim 12, wherein the first marker on the LED comprises a photolithographic pattern, an electrode shape or pattern, an asymmetric die shape, a notch on the die, or a scratch on the die.
[claim15]
15. The method of claim 12, wherein the second marker on the package comprises an electrode shape or pattern, an asymmetric package shape, a notch on the package, or a scratch on the package.
[claim16]
16. The method of claim 9, wherein the LED is installed in an external circuit or system that utilizes the light polarization, and the external circuit or system includes at least one third marker indicating a light polarization direction of the external circuit or system, wherein the package is positioned within the external circuit by aligning the second marker with the third marker.
[claim17]
17. The method of claim 9, wherein the package contains an array of the polarized LEDs.
[claim18]
18. A light emitting diode (LED) apparatus, comprising: at least one LED, having at least one orientation dependent emission characteristic, including at least one first marker indicating an orientation of the LED for which the orientation dependent emission characitinsoc is a maximum;
and
a package, for containing the LED, including at least one second marker indicating an orientation of the package for which the orientation dependent emission characteristic is a maximum;wherein the LED is positioned within the package by aligning the first marker with the second marker.
[claim19]
19. A method of fabricating at least one light emitting diode (LED) apparatus, comprising: obtaining at least one LED, having an orientation dependent emission characteristic, including at least one first marker indicating an orientation of the LED for which the orientation dependent characteristic is a maximum;
and
obtaining a package, for containing the LED, including at least one second marker indicating an orientation of the package for which the orientation dependent emission characteristic is a maximum;wherein the LED is positioned within the package by aligning the first marker with the second marker.
  • Inventor, and Inventor/Applicant
  • MASUI HISASHI
  • NAKAMURA SHUJI
  • DENBAARS STEVEN P
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
IPC(International Patent Classification)
Reference ( R and D project ) ERATO NAKAMURA Inhomogeneous Crystal AREA
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