Source: http://patents.com/us-9818731.html
Timestamp: 2018-12-11 04:19:13
Document Index: 767213455

Matched Legal Cases: ['Application No. 2014', 'art 60', 'art 80', 'art 50', 'art 60', 'art 60', 'art 60', 'art) 51']

US Patent # 9,818,731. Light emitting device - Patents.com
United States Patent 9,818,731
Kondoh , et al. November 14, 2017
Kondoh; Masaki (Sakai, JP), Nada; Tomokazu (Sakai, JP), Hata; Toshio (Sakai, JP), Koizumi; Hideshi (Sakai, JP)
Family ID: 1000002948561
15/307,597
PCT/JP2015/061454
WO2015/182272
US 20170047311 A1 Feb 16, 2017
May 30, 2014 [JP] 2014-113457
Current CPC Class: H01L 25/0753 (20130101); H01L 33/56 (20130101); H01L 33/60 (20130101); H01L 33/62 (20130101); H01L 2224/48091 (20130101); H01L 2224/49113 (20130101); H01L 2224/48247 (20130101); H01L 2224/48257 (20130101); H01L 2224/48091 (20130101); H01L 2924/00014 (20130101)
Current International Class: H01L 33/00 (20100101); H01L 33/56 (20100101); H01L 33/60 (20100101); H01L 25/075 (20060101); H01L 33/62 (20100101)
2008/0036943 February 2008 Matsumoto et al.
2008/0259252 October 2008 Tanaka et al.
7-175423 Jul 1995 JP
8-272316 Oct 1996 JP
10-136159 May 1998 JP
10-161567 Jun 1998 JP
2001-177156 Jun 2001 JP
2002-82635 Mar 2002 JP
2004-193357 Jul 2004 JP
2005-321727 Nov 2005 JP
2008-269947 Nov 2008 JP
2011-192738 Sep 2011 JP
2012-69572 Apr 2012 JP
Machine translation of PCT/JP2015/061454 wrtten opinion of an International searching Authority dated Jun. 2015. cited by examiner .
International Search Report for PCT/JP2015/061454 dated Jun. 16, 2015, 2 pages. cited by applicant .
International Preliminary Report on Patentability (foreign language) dated May 12, 2016, 9 pages. cited by applicant.
Attorney, Agent or Firm: Steven Reiss
1. A light emitting device configured to emit at least blue-green light and yellow or yellow-green light, the light emitting device comprising: a substrate; an LED chip group disposed on a main surface side of the substrate and including a plurality of LED chips; and a sealing part collectively sealing the LED chip group, wherein the LED chip group includes at least two green LED chips including a first green LED chip and a second green LED chip, at least one blue LED chip, and at least one red LED chip, the first green LED chip has a dominant wavelength shorter than a dominant wavelength of the second green LED chip, the first green LED chip is disposed adjacently to at least one of the at least one blue LED chip, the second green LED chip is disposed adjacently to at least one of the at least one red LED chip, and when a vertical direction and a horizontal direction orthogonal to each other in a top view of the light emitting device are defined, (A) the first green LED chip and the second green LED chip substantially align with each other along a same horizontal direction, and the blue LED chip and the red LED chip substantially align with each other along a same horizontal direction, or (B) the red LED chip and a first one of the first green LED chip and the second green LED chip substantially align with each other along a same horizontal direction, and a second one of the first green LED chip and the second green LED chip and the blue LED chip substantially align with each other along a same horizontal direction.
2. The light emitting device according to claim 1, wherein the dominant wavelength of the first green LED chip is greater than or equal to 480 nm and less than or equal to 520 nm, and the dominant wavelength of the second green LED chip is greater than or equal to 520 nm and less than or equal to 560 nm.
3. The light emitting device according to claim 1, wherein a dominant wavelength of one of the green LED chips which has a dominant wavelength which is longest is longer than a dominant wavelength of each of the other green LED chips by 20 nm or greater.
4. The light emitting device according to claim 1, wherein regarding xy chromaticity coordinates of a CIE chromaticity diagram, a difference between an x value of one of the green LED chips which has a dominant wavelength which is longest and an x value of each of the other green LED chips is greater than or equal to 0.06.
5. The light emitting device according to claim 1, wherein each LED chip of the LED chip group is independently driven.
This application is the U.S. national phase of International Application No. PCT/JP2015/061454 filed 14 Apr. 2015 which designated the U.S. and claims priority to JP Patent Application No. 2014-113457 filed 30 May 2014, the entire contents of each of which are hereby incorporated by reference.
To solve the problems described above, a light emitting device according to one aspect of the present invention is a light emitting device configured to emit at least blue-green light and yellow or yellow-green light the light emitting device including: a substrate, an LED chip group disposed on a main surface side of the substrate and including a plurality of LED chips; and a sealing part collectively sealing the LED chip group, wherein the LED chip group includes at least two green LED chips including a first green LED chip and a second green LED chip, at least one blue LED chip, and at least one red LED chip, the first green LED chip has a dominant wavelength shorter than a dominant wavelength of the second green LED chip, the first green LED chip is disposed adjacently to at least one of the at least one blue LED chip, the second green LED chip is disposed adjacently to at least one of the at least one red LED chip, and when a vertical direction and a horizontal direction orthogonal to each other in a top view of the light emitting device are defined, (A) in a view in the vertical direction, directivity characteristics of the second green LED) chip and directivity characteristics of the red LED chip substantially match with each other, and directivity characteristics of the blue LED chip and directivity characteristics of the first green LED chip substantially match with each other, and (B) in a view in the horizontal direction, the directivity characteristics of the red LED chip and the directivity characteristics of the first green LED chip substantially match with each other, and the directivity characteristics of the second green LED chip and the directivity characteristics of the blue LED chip substantially match with each other, or (C) in a view in the vertical direction, directivity characteristics of mixed colors of the second green LED chip and the first green LED chip, the directivity characteristics of the red LED chip, and the directivity characteristics of the blue LED chip substantially match with one another, and (D) in a view in the horizontal direction, the directivity characteristics of the second green LED chip and the directivity characteristics of the first green LED chip substantially match with each other.
FIG. 3 is a view in which the top view of the light emitting device of FIG. 2 and a schematic sectional view of the main part of the light emitting device taken along line A-A' are shown in comparison.
In a top view of the light emitting device 100, the dimension of the light emitting device 100 is 3.2 mm.times.3.5 mm.
First, one green LED chip GB (dominant wavelength 504 nm), one green LED chip GY (dominant wavelength 538 nm), one blue LED chip B (dominant wavelength 465 nm), and one red LED chip R (dominant wavelength 626 nm) are prepared and each fixed to one of a plurality of chip mount regions of an inner lead part 60 on the main surface side of a substrate 51 with a bonding silicone resin. The bonding silicone resin is cured at 150.degree. C. for 5 hours.
Next, a silicone resin is injected into an opening part 80, thereby forming a sealing resin part 50. The injected silicone resin is first cured at 100.degree. C. for 1 hour and is then cured at 150.degree. C. for 5 hours.
The green LED chip BT (having a dominant wavelength of 498 nm) was fixed to one of a plurality of chip mount regions of an inner lead part 60 on the main surface side of a substrate 51 with a bonding silicone resin. The bonding silicone resin was cured at 150.degree. C. for 5 hours.
The green LED chip G (having a dominant wavelength of 525 nm) was fixed to one of a plurality of chip mount regions of an inner lead part 60 on the main surface side of a substrate 51 with a bonding silicone resin. The bonding silicone resin was cured at 150.degree. C. for 5 hours.
Table 1 shows the characteristics of the green LED chip GB and the green LED chip GY. In Table 1, ".lamda.d" is the dominant wavelength, "CIE_x" is the x value of on the xy chromaticity coordinates of the CIE chromaticity diagram, and "CIE_y" is the y value on the xy chromaticity coordinates.
Table 2 and Table 3 show the characteristics of the LED chips used in the embodiments. In Table 2, "t" of the chip size is the height (unit: .mu.m) of the LED chip. In Table 3, the green LED chip BP and the green LED chip BR are not mentioned in the above-described embodiments, but in FIG. 4, the point BP indicating the chromaticity of light emitted from the green LED chip BP and the point BR indicating the chromaticity of light emitted from the green LED chip BR are shown.
TABLE-US-00001 TABLE 1 LED Chip .lamda.d (nm) CIE_x CIE_y Green LED Chip GB 504 0.081 0.567 Green LED Chip GY 540 0.245 0.71 Characteristic Difference 36 0.164 0.143
TABLE-US-00002 TABLE 2 Dominant Luminous Wavelength Intensity LED Chip (nm) (mcd) Chip Size Red LED Chip R 610-630 350-450 240 .mu.m .times. 240 .mu.m .times. 100t Green LED Chip G 520-530 530-770 296 .mu.m .times. 321 .mu.m .times. 90t Blue LED Chip B 460-480 90-125 296 .mu.m .times. 321 .mu.m .times. 90t
TABLE-US-00003 TABLE 3 LED Chip Dominant Wavelength (nm) Green LED Chip BP 489 Green LED Chip BR 495 Green LED Chip BT 498 Green LED Chip GB 504 Green LED Chip GY 538
FIG. 9 is a plan view illustrating a back surface 100' of the light emitting device 100 of FIG. 1. For a better understanding of the description, the members which are not visible substantially in FIG. 9 and which are disposed on the main surface of the substrate 51 of FIG. 1 are shown by broken lines.
In order to enhance the purity of a color obtained by mixing colors of light emitted from adjacent LED chips, and also to extend the color reproduction range, the difference in height in the inner lead part 60 has to be reduced by forming through holes 75 in the back surface 100' of the light emitting device 100.
50 Sealing Resin Part (Sealing Part) 51 Substrate 100 Light Emitting Device 200 Light Emitting Device 300 Light Emitting Device 350 Light Emitting Device 400 Light Emitting Device 500 Light Emitting Device 600 Light Emitting Device B Blue LED Chip BT Green LED Chip (First Green LED Chip) GB Green LED Chip (First Green LED Chip) GY Green LED Chip (Second Green LED Chip) R Red LED Chip
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