Source: https://patents.google.com/patent/US8669573B2/en
Timestamp: 2019-09-19 23:27:38
Document Index: 795587105

Matched Legal Cases: ['Application No. 200810088194', 'Application No. 2011', 'application No. 2008', 'Application No. 097104985', 'Application No. 2008', 'Application No. 097104985']

US8669573B2 - Packaged semiconductor light emitting devices having multiple optical elements - Google Patents
US8669573B2
US8669573B2 US12/984,242 US98424211A US8669573B2 US 8669573 B2 US8669573 B2 US 8669573B2 US 98424211 A US98424211 A US 98424211A US 8669573 B2 US8669573 B2 US 8669573B2
US12/984,242
US20110101385A1 (en
2011-01-04 Application filed by Cree Inc filed Critical Cree Inc
2011-01-04 Priority to US12/984,242 priority patent/US8669573B2/en
2011-05-05 Publication of US20110101385A1 publication Critical patent/US20110101385A1/en
2014-03-11 Publication of US8669573B2 publication Critical patent/US8669573B2/en
This application is a continuation of U.S. patent application Ser. No. 11/705,233, filed on Feb. 12, 2007, the disclosure of which is hereby incorporated herein by reference in its entirety.
Another approach uses compression molded lenses formed of silicone. Using compression molding, an array of compression molded lenses may be placed over a matching array of LED chips on a substrate or wafer. However, conventional compression molding of lenses generally requires the use of electrical contacts on the back side, rather than the front side, of the substrate as the molding material may extend across and limit formation of electrical connections with front side contacts.
Some embodiments of the present invention provide methods of packaging a semiconductor light emitting device including providing a substrate having the semiconductor light emitting device on a front face thereof. A first optical element is formed from a first material on the front face proximate the semiconductor light emitting device but not covering the semiconductor light emitting device and a second optical element is formed from a second material, different from the first material, over the semiconductor light emitting device and the first optical element.
In other embodiments, at least one of forming the first optical element or forming the second optical element comprises compression molding the respective optical element. The first optical element and the second optical element may have different refractive indexes selected to provide a desired optical characteristic for the packaged semiconductor light emitting device. The first and second optical elements may be configured to provide a selected viewing angle to the packaged semiconductor light emitting device. Forming the first optical element may include forming the first optical element using a process other than compression molding.
In further embodiments, the first material has an adhesion characteristic selected to facilitate adhesion of the first optical element to the substrate during compression molding and/or to limit stress applied to the light emitting device and/or a wire bond coupled thereto during thermal cycling of the packaged semiconductor light emitting device. Providing the substrate may include mounting the semiconductor light emitting device flush on the front face thereof without a reflector cavity and the second optical element may be molded to and extend from the front face of the substrate in a region surrounding the semiconductor light emitting device and extends over the semiconductor light emitting device.
In other embodiments, the substrate includes a plurality of semiconductor light emitting devices on the front face thereof. Forming the first optical element and forming the second optical element include forming a plurality of first optical elements and forming a plurality of second optical elements on the front face of the substrate over corresponding ones of the semiconductor light emitting devices.
In further embodiments, methods of packaging a semiconductor light emitting device include providing a substrate having the semiconductor light emitting device on a front face thereof. A first optical element is formed from a first material on the front face proximate the semiconductor light emitting device and a second optical element is formed from a second material, different from the first material, over the semiconductor light emitting device and the first optical element. Forming the first optical element includes forming the first optical element using a process other than compression molding and forming the second optical element includes compression molding the respective optical element on the front face. The process other than compression molding may be dispensing and/or bonding. The first optical element and the second optical element may have different refractive indexes selected to provide a desired optical characteristic for the packaged semiconductor light emitting device.
In yet other embodiments, methods of packaging a semiconductor light emitting device include providing a substrate having the semiconductor light emitting device on a front face thereof. A first optical element is formed from a first material on the front face proximate the semiconductor light emitting device and a second optical element is formed from a second material, different from the first material, over the semiconductor light emitting device and the first optical element without leaving a gap between the first optical element and the second optical element. The first optical element and the second optical element have different refractive indexes selected to provide a desired optical characteristic for the packaged semiconductor light emitting device. At least one of forming the first optical element or forming the second optical element may include compression molding the respective optical element and
In further embodiments, packaged semiconductor light emitting devices include a substrate and a semiconductor light emitting device on a front face of the substrate. A first optical element is on the front face of the substrate proximate the semiconductor light emitting device but not covering the semiconductor light emitting device and a second optical element is on the front face of the substrate over the semiconductor light emitting device and the first optical element.
In other embodiments, the semiconductor light emitting device is flush on the front face of the substrate without a reflector cavity and the second optical element extends from the front face of the substrate in a region surrounding the semiconductor light emitting device and extends over the semiconductor light emitting device. The semiconductor light emitting device may include a plurality of semiconductor light emitting devices and the compression molded optical elements may be a plurality of optical elements over corresponding ones of the semiconductor light emitting devices. A wire bond may be provided that electrically couples the semiconductor light emitting device to a contact portion of the substrate and at least one of the optical elements may be a compression molded optical element that directly contacts the wire bond. The first optical element may be a first material having an adhesion characteristic selected to facilitate adhesion of the first optical element to the substrate during compression molding and/or to limit stress applied to the light emitting device and/or a wire bond coupled thereto during thermal cycling of the packaged semiconductor light emitting device.
In yet further embodiments, packaged semiconductor light emitting devices include a substrate and a semiconductor light emitting device on a front face of the substrate. A first optical element is on the front face of the substrate proximate the semiconductor light emitting device. The first optical element is a first material. A second optical element is on the front face of the substrate over the semiconductor light emitting device and the first optical element with no gap between the first optical element and the second optical element. The second optical element is a second material, different from the first material. The first optical element and the second optical element have different refractive indexes selected to provide a desired optical characteristic for the packaged semiconductor light emitting device. The first optical element may be on the front face of the substrate proximate the semiconductor light emitting device but not covering the semiconductor light emitting device and the second optical element may be on the front face of the substrate over the semiconductor light emitting device and the first optical element
As seen in the embodiments illustrated in FIG. 3, an assembly 200 including a substrate 205 with semiconductor light emitting devices 208 and front side contacts 215 on a front face 207 thereof is provided. As noted above, in the illustrated embodiments, a mask 230 is also provided covering the front side contacts 215. Also shown schematically in FIG. 3 is a compression mold 305. Mold 305 is provided with indentations or cavities 320 shaped as lenses. A cavity 320 is provided for each respective one of the illustrated plurality of light emitting devices 208. Silicone 315 is placed over the mold 305 and in the indentations 320. As also shown in FIG. 3, a release layer 310 may also be used between the silicone 315 and the mold 305. The release layer 310 may facilitate removing the mold 305 at the release layer 310 after compression molding of lenses from the silicone 315. The release layer 310 may be, for example, A flex film available from Asahi Glass Company. As seen in FIG. 3, the silicone 315 in the compression molding process illustrated fills the cavities 320 but further extends across the region between and surrounding the cavities 320, to correspondingly result in deposition on the substrate 205 of a residual coating over a region of the front face of the substrate 205 including the contact 215. Such an additional coverage of silicone 315 may occur due to the nature of the compression molding process used to form the lens or optical element in embodiments of the present invention as described herein.
a semiconductor light emitting device on a front face of the substrate;
a first optical element on the front face of the substrate proximate the semiconductor light emitting device but not covering the semiconductor light emitting device, wherein the first optical element comprises a ring around the semiconductor light emitting device having a curved top and wherein the ring comprises a toroidal shape; and
a second optical element on the front face of the substrate over the semiconductor light emitting device and the first optical element, wherein the first and second optical elements comprise different materials to provide the first optical element and the second optical element different refractive indexes selected to provide a desired optical characteristic for the packaged semiconductor light emitting device.
2. The device of claim 1, wherein the semiconductor light emitting device is flush on the front face of the substrate without a reflector cavity and wherein the second optical element extends from the front face of the substrate in a region surrounding the semiconductor light emitting device and extends over the semiconductor light emitting device.
3. The device of claim 1, further comprising a wire bond that electrically couples the semiconductor light emitting device to a contact portion the substrate and wherein the second optical element is a compression molded optical element that directly contacts the wire bond.
4. The device of claim 3, wherein the second optical element comprises a first material having an adhesion characteristic selected to facilitate adhesion of the first optical element to the substrate during compression molding and to limit stress applied to the light emitting device and/or a wire bond coupled thereto during thermal cycling of the packaged semiconductor light emitting device.
5. The device of claim 1, wherein the desired optical characteristic comprises a selected viewing angle of the packaged semiconductor light emitting device.
6. The device of claim 1, wherein the first optical element extends entirely around the light emitting device.
7. The device of claim 1, wherein the first optical element comprises an additive.
8. The device of claim 1, wherein the second optical element comprises an additive.
9. The device of claim 1, wherein the first optical element comprises a first additive and the second optical element comprises a second additive different form the first additive.
10. The device of claim 1, wherein the first optical element comprises an additive such that the first optical element provides greater efficiency in light extraction from the semiconductor light emitting device than a reflective cavity.
11. The device of claim 1, wherein the ring is symmetrical along a vertical axis orthogonal to a radius of the ring at any point on the ring.
a first optical element on the front face of the substrate proximate the semiconductor light emitting device but not covering the semiconductor light emitting device, wherein the first optical element comprises a ring around the semiconductor light emitting device having a curved top; and
a second optical element on the front face of the substrate over the semiconductor light emitting device and the first optical element, wherein the second optical element directly contacts the semiconductor light emitting device, wherein the second optical element directly contacts an entire external surface of the first optical element that is not contacting the front face of the substrate and wherein the optical elements comprise a material different from a material of the substrate, and wherein at least one of the first and second optical elements comprises an additive to affect optical properties.
13. The device of claim 12, wherein the first optical element extends entirely around the light emitting device.
US12/984,242 2007-02-12 2011-01-04 Packaged semiconductor light emitting devices having multiple optical elements Active US8669573B2 (en)
US12/984,242 US8669573B2 (en) 2007-02-12 2011-01-04 Packaged semiconductor light emitting devices having multiple optical elements
US13/486,223 US8822245B2 (en) 2007-02-12 2012-06-01 Packaged semiconductor light emitting devices having multiple optical elements and methods of forming the same
US11/705,233 Continuation US9061450B2 (en) 2007-02-12 2007-02-12 Methods of forming packaged semiconductor light emitting devices having front contacts by compression molding
US13/486,223 Continuation US8822245B2 (en) 2007-02-12 2012-06-01 Packaged semiconductor light emitting devices having multiple optical elements and methods of forming the same
US20110101385A1 US20110101385A1 (en) 2011-05-05
US8669573B2 true US8669573B2 (en) 2014-03-11
US11/705,233 Active 2028-09-14 US9061450B2 (en) 2007-02-12 2007-02-12 Methods of forming packaged semiconductor light emitting devices having front contacts by compression molding
US12/984,242 Active US8669573B2 (en) 2007-02-12 2011-01-04 Packaged semiconductor light emitting devices having multiple optical elements
US13/486,223 Active US8822245B2 (en) 2007-02-12 2012-06-01 Packaged semiconductor light emitting devices having multiple optical elements and methods of forming the same
JP5347681B2 (en) * 2009-04-20 2013-11-20 日亜化学工業株式会社 The light-emitting device
JP5917796B2 (en) * 2010-07-14 2016-05-18 三菱電機株式会社 Led packaging device
DE102012108939A1 (en) * 2012-09-21 2014-03-27 Osram Opto Semiconductors Gmbh An optoelectronic component comprising a transparent outcoupling
CN102916006B (en) * 2012-11-06 2015-12-02 广州市添鑫光电有限公司 A convex lens having two or more integrated power led integrated light source and manufacturing process
JP5747947B2 (en) * 2013-06-10 2015-07-15 日亜化学工業株式会社 Emitting device and manufacturing method thereof
JP2017050366A (en) 2015-08-31 2017-03-09 日亜化学工業株式会社 Composite substrate, light emitting device, and manufacturing method for light emitting device
JPS63129638A (en) 1986-11-20 1988-06-02 Nissei Plastics Ind Co Apparatus for manufacturing light emitting diode
JPH0645659A (en) 1992-07-23 1994-02-18 Stanley Electric Co Ltd Multiple-color light emitting chip led
JPH11183819A (en) 1997-12-19 1999-07-09 Canon Inc Optical element, molding die for the optical element, method for molding the optical element, and optical device having the optical element
JPH11289110A (en) 1998-04-02 1999-10-19 Matsushita Electron Corp Semiconductor light-emitting device
JP2000200927A (en) 1998-12-28 2000-07-18 Citizen Electronics Co Ltd Manufacture of electronic component
JP2000302841A (en) 1999-02-18 2000-10-31 Three Bond Co Ltd Epoxy resin composition
CN1822365A (en) 2005-02-18 2006-08-23 日亚化学工业株式会社 Light emitting device provided with lens for controlling light distribution characteristic
JP2006287032A (en) 2005-04-01 2006-10-19 Nichia Chem Ind Ltd Light emitting device
JP2006295228A (en) 2006-08-01 2006-10-26 Sharp Corp Light emitting device
JP2006229054A (en) 2005-02-18 2006-08-31 Nichia Chem Ind Ltd Light-emitting device
Chinese Third Office Action Corresponding to Chinese Patent Application No. 200810088194.X; Date of Issue: Nov. 6, 2012; 7 Pages.
International Search Report and Written Opinion (6 pages) corresponding to International Application No. PCT-US07-12158; Mailing Date: Jun. 9, 2008.
International Search Report and Written Opinion (9 pages) corresponding to International Application No. PCT-US07-12158; Mailing Date: May 2, 2008.
Japanese Office Action Corresponding to Japanese Patent Application No. 2011-034183; Mailing Date: Dec. 4, 2012; 3 Pages (Foreign Text Only).
Japanese Office Action for corresponding JP application No. 2008-030633 mailed May 24, 2011 with translation.
Japanese Office Action, Japanese Patent Application No. 097104985; Issuance: Nov. 7, 2013; 9 Pages.
Notification of Transmittal of International Preliminary Report on Patentability (11 pages) corresponding to International Application No. PCT-US07-12158; Mailing Date: Nov. 3, 2008.
Office Action for corresponding Japanese Application No. 2008-030634 mailed Dec. 16, 2011 and translation thereof.
Taiwanese Office Action, Taiwanese Patent Application No. 097104985; Issuance: Nov. 7, 2013; 9 Pages.
DE102008008058A1 (en) 2008-08-28
CN104024723B (en) 2016-08-24 The flexible light-emitting semiconductor device having a three-dimensional structure