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US20040046178A1 - Light emitting diode device - Google Patents

Light emitting diode device Download PDF

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Publication number
US20040046178A1
US20040046178A1 US10/648,224 US64822403A US2004046178A1 US 20040046178 A1 US20040046178 A1 US 20040046178A1 US 64822403 A US64822403 A US 64822403A US 2004046178 A1 US2004046178 A1 US 2004046178A1
Authority
US
United States
Prior art keywords
led
chromaticity
color
dye
light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/648,224
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English (en)
Inventor
Masaki Sano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Citizen Electronics Co Ltd
Original Assignee
Citizen Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Citizen Electronics Co Ltd filed Critical Citizen Electronics Co Ltd
Assigned to CITIZEN ELECTRONICS CO., LTD. reassignment CITIZEN ELECTRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SANO, MASAKI
Publication of US20040046178A1 publication Critical patent/US20040046178A1/en
Priority to US10/900,321 priority Critical patent/US7141442B2/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/84—Coatings, e.g. passivation layers or antireflective coatings
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/851—Wavelength conversion means
    • H10W74/00—

Definitions

  • the present invention relates to a light emitting diode device having a light emitting diode (LED) as a light source.
  • LED light emitting diode
  • FIG. 18 is a perspective view of a conventional LED device for emitting white light
  • FIG. 19 is a sectional view of the LED device.
  • the white light emitting LED device 120 comprises a substrate 101 having a pair of terminal electrodes 102 and 103 provided on the upper surface and the underside thereof, and an LED 105 for emitting blue or ultraviolet light.
  • the cathode of the LED 105 is connected to the electrode 102 through an adhesive 104 , and the anode is connected to the electrode 103 by a bonding wire 106 .
  • the LED 105 and the upper surface of the substrate 101 are covered by a transparent resin 107 . In the resin 107 , yellow phosphor particles 108 are mixed.
  • the phosphor particle 108 When the blue or ultraviolet light S strikes the phosphor particle 108 , the phosphor particle emits yellow light or green light excited from red-green-blue S 1 . The mixture of the bluish light and the yellowish light takes on white light based on the wavelength conversion.
  • FIG. 21 is a sectional view sh wing another conventional LED device 130 .
  • the same parts as the conventional LED device of FIGS. 18 and 19 are identified by the same reference numerals as those of FIGS. 18 and 19.
  • colored particles 109 are mixed as color filters.
  • the white light by the mixture of the bluish light and the yellowish light described above is changed by the color of the colored particle 109 by the subtractive color mixing. Consequently, by selecting the color of the colored particles 109 , desired color light is produced.
  • the LED device 130 is provided to produce various color light.
  • FIG. 22 is a perspective view showing a back light unit for illuminating an LCD (liquid crystal display),
  • FIG. 23 is a sectional view of the back light unit.
  • the back light unit 140 comprises a pair of white light emitting LED devices 120 shown in FIG. 18, a lighting panel 142 , a diffusion panel 143 , a Py prism sheet 144 , a Px prism sheet 145 , a reflection plate 146 , and a color LCD 147 .
  • the lighting panel 142 is made of a transparent plastic and has an upper surface 142 a , lower surface 142 b and front side 142 c .
  • the white light emitting LED devices 120 are mounted on an LED substrate 120 b and disposed opposite the front side 142 c as edge light.
  • the diffusion panel 143 is disposed above the upper surface 142 a of the lighting panel 142 and the reflection plate 146 is disposed below the lower surface 142 b.
  • the white light emitted from the LED devices 120 enters the lighting panel 142 from the front side 142 c .
  • the entered light is repeatedly reflected by the upper and lower surfaces 142 a and 142 b.
  • the light is diffusely reflected by the prism surface of the lower surface 142 b and discharged from the upper surface 142 a .
  • a crease or uneven surface may be used.
  • the discharged direction of the light is arranged in a small range by the diffusion panel 143 , and further arranged by the prism sheets 144 and 145 in the Y and X-directions, and finally arranged in the Z-direction.
  • the light arranged in the Z-direction illuminates the LCD 147 .
  • LCDs vary in the characteristic of the color filter provided therein. Namely, the color filter characteristic varies with the manufacturer.
  • the chromaticity of the picture displayed on the LCD is determined by the characteristic of the color filter and the chromaticity of the white LED device 120 illuminating the LCD. The relationship between the characteristics will be described with reference to a drawing hereinafter.
  • FIG. 24 is a graph of CIE chromaticity.
  • x-coordinate designates proportion of R (Red)
  • y-coordinate designates proportion of G (Green). If proportion of B (Blue) is designated by z, there is the following relationship there-between.
  • the point c 0 in the graph is chromaticity point where the ratio of R, G and B is 1:1:1.
  • the point b 0 is a coordinate point of an aim chromaticity of the white LED device, and the reference letter B designates an allowable range of the point b 0 .
  • the point d 0 is a chromaticity point of the wavelength transmittance of the color filter of the LCD.
  • the point d 0 has a complementary color relation to the point b 0 .
  • the reference letter D designates a dispersion range of the point d 0 .
  • the chromaticity of the white LED device 120 is the chromaticity at the point b 0 or a value in the allowable range B
  • the light from the white LED device 120 transmits the color filter having a chromaticity of the point d 0 or a value in the range D, so that the light is corrected to light having a chromaticity based on the white light designated at the point c 0 .
  • the chromaticity of the light emitted from the white LED device 120 varies according to dispersion of the wavelength and intensity of the light emitted from the LED 105 and dispersion of the distribution of particles in the resin 107 of the product.
  • the point f 0 in FIG. 24 designates an average chromaticity of the ab ve described products.
  • F designates a range of the dispersion. Therefore, actual products each having chromaticity in the desired range B is a very small percentage of all products. Thus, the yield of the white LED device is very low.
  • An object of the present invention is to provide an LED device having a constant chromaticity.
  • a LED device comprising an LED mounted on a substrate, a transparent resin including phosphor particles for changing a color of light emitted from the LED, and the transparent resin is colored by a dye at least on the surface of the transparent resin and the dye is for correcting the changed color to a desired color.
  • the dye has a color for correcting the color of the light emitted from the LED.
  • the dye has a complementary color to the color of the light emitted from the LED.
  • the present invention provides a method for manufacturing an LED device comprising the steps of mounting an LED on a substrate, sealing the LED with a transparent resin including phosphor particles to form an LED intermediate device, measuring chromaticity of light from the LED device before being dyed, dyeing the transparent resin to acquire a desired color, the dye having a color for correcting the measured chromaticity to a desired chromaticity.
  • the transparent resin is colored at least on the surface.
  • the dye has a complementary color to the measured chromaticity.
  • FIG. 1 is a perspective view of an LED device according to the present invention.
  • FIG. 2 is a sectional view of the LED device
  • FIG. 3 is a sectional view showing a step for manufacturing the LED device
  • FIG. 4 is a graph of chromaticity of an LED device
  • FIG. 5 is an enlarged view of the graph of FIG. 4;
  • FIG. 6 is a graph of spectrum at chromaticity point cb and chromaticity point c 1 ;
  • FIG. 7 is a graph showing spectrum of a color filter of a dye
  • FIG. 8 is a graph showing spectrum of the color filter
  • FIG. 9 is a graph showing spectrum of a color filter of a dye
  • FIG. 10 is a graph showing spectrum of the color filter
  • FIG. 11 is a graph showing spectrum of a c lor filter of a dye
  • FIG. 12 is a graph showing spectrum of a color filter of a dye
  • FIG. 13 is a graph showing spectrum of a color filter of a dye
  • FIG. 14 is a perspective view showing a back light unit for illuminating an LCD in which a white LED complement device is used;
  • FIG. 15 is a sectional view of the back light unit
  • FIGS. 16 and 17 are graphs of spectrum of emitted light from a device of a second embodiment of the present invention.
  • FIG. 18 is a perspective view of a conventional LED device for emitting white light
  • FIG. 19 is a sectional view of the conventional LED device
  • FIG. 20 is a sectional view for explaining the operation of the device
  • FIG. 21 is a sectional view showing another conventional LED device
  • FIG. 22 is a perspective view showing a back light unit for illuminating an LCD
  • FIG. 23 is a sectional view of the back light unit.
  • FIG. 24 is a graph of CIE chromaticity.
  • FIG. 1 is a perspective view of an LED device according to the present invention, and for emitting white light
  • FIG. 2 is a sectional view of the LED device.
  • the light emitting LED device 21 comprises a substrate 1 having a pair of terminal electrodes 2 and 3 provided on the upper surface and the underside thereof, and a blue LED 5 for emitting blue light.
  • the cathode of the LED 5 is connected to the electrode 2 through an adhesive 4 , and the anode is connected to the electrode 3 by a bonding wire 6 .
  • a transparent resin 7 is provided for sealing the LED 5 and the upper surface of the substrate 1 .
  • the transparent resin 7 comprises a white light producing portion 10 and a colored portion 11 for producing desired color light. In the portion 10 , yellow phosphor particles or R, G or B phosphor particles 8 are mixed. In the colored portion 11 , coloring dye is permeated.
  • FIG. 3 is a sectional view showing a step for manufacturing the LED device.
  • the terminal electrodes 2 and 3 are formed on the upper surface and the underside surface of the substrate 1 by the metalizing method.
  • the cathode of the LED 5 is connected to the electrode 2 through the adhesive 4 , and the anode is connecting to the electrode 3 by the bonding wire 6 .
  • the LED 5 and the upper surface of the substrate 1 are sealed by the white light producing resin 7 including the yellow phosphor particles 8 .
  • the chromaticity of the white light emitted from the white LED device is photoelectrically measured to select LED devices which are out of a desired chromaticity.
  • a color dye for reducing the unnecessary color of the light emitted from the defective LED devices is determined and permeated in the resin 7 , thereby forming the colored portion 11 .
  • a white LED completed device 21 is produced.
  • FIG. 4 is a graph of chromaticity of an LED device.
  • the chromaticity point c 1 is a coordinate point of an aim chromaticity of the white LED device, and the reference letter S 1 designates an allowable range of the point c 1 .
  • a range S 2 is determined as an allowable range and a white LED device having chromaticity in the range S 2 is photoelectrically picked up as an available device.
  • Picked up LED devices are classified into four classes a, b, c, d. Namely, the white LED device emitting bluish white light is classified into the class a, the device emitting yellowish white light is classified into the class b, the device of reddish light is into the class c, and greenish is int the class d.
  • Colored dye of complementary color to the classified color is selected and transmitted in the resin 7 as described hereinafter in detail.
  • FIG. 5 is an enlarged view of the graph of FIG. 4.
  • yellow dye of naphthoquinone group was selected as a complementary color.
  • the white LED device 20 was immersed in a dye liquid comprising alcohol including yellow dye of 100 ppm for fifteen minutes while stirring, thereby transmitting the dye in the resin 7 to form the colored portion 11 .
  • the white LED completed device 21 was produced.
  • the chromaticity of the LED device 21 was that of the desired point c 1 .
  • FIG. 6 is a graph of spectrum at chromaticity point cb and chromaticity point c 1 which are shown by lines Hb and H 1 .
  • R component is a part at 625 nm
  • G component is a part at 560 nm
  • B component is a part at 450 nm.
  • the color correction of the bluish white light is based on the subtractive mixture of the yellow of the dye as the subtractive complementary color as the following description.
  • FIG. 7 is a graph showing spectrum of the color of the dye.
  • the white LED device 21 having the chromaticity at the point c 1 was produced.
  • a white LED device 20 having a chromaticity in the range Sb was corrected in chromaticity in a condition similar to the above described condition.
  • the chromaticity of the light emitted from the LED device was corrected to a value within the range S 1 around the desired chromaticity at the point c 1 .
  • FIG. 8 is a graph showing spectrum of the color filter. The spectrum corresponding to the point cy is shown by Hy in FIG. 8.
  • the white LED device 20 was immersed in a dye liquid comprising alcohol including blue dye of 100 ppm for ten minutes, thereby transmitting the dye in the resin 7 to form the colored portion 11 .
  • a white LED completed device 21 was produced.
  • the colored portion 11 has a filter characteristic shown by a reference letter Fy in FIG. 9.
  • FIG. 10 is a graph showing spectrum of the color filter. The spectrum corresponding to the point cr is shown by Hr in FIG. 10.
  • yellow dye of the naphthoquinone group, and blue dye of anthraquinone group were selected.
  • the white LED device 20 was immersed in a dye liquid comprising alcohol including yellow dye of 50 ppm and blue dye of 50 ppm for five minutes, thereby transmitting the dyes in the resin 7 to form the colored portion 11 .
  • the white LED device 21 was produced by the summation effect of the yellow filter and the blue filter.
  • the yellow filter characteristic is shown by a reference letter Fr 1 in FIG. 11.
  • the blue filter characteristic is shown by a letter Fr 2 in FIG. 11.
  • the filter characteristics are added by the subtractive mixture to provide a total filter characteristic which is shown by the letter Fr in FIG. 11.
  • the ratio of R, G, B (0.33:0.30:0.37) in the chromaticity of the point cr was corrected by the color filter in the colored portion 11 .
  • a white LED device 20 having a chromaticity in the range Sr was corrected in chromaticity in a condition similar to the above described condition.
  • the chromaticity of the light emitted from the LED device was corrected to a value within the range S 1 around the desired chromaticity at the point c 1 .
  • FIG. 12 is a graph showing spectrum of the color filter. The spectrum corresponding to the point cg is shown by Hg in FIG. 12.
  • red dye of monoazo group was selected.
  • the white LED device 20 was immersed in a dye liquid comprising alcohol including red dye of 70 ppm for ten minutes, thereby transmitting the dye in the resin 7 to form the c 1 red p rtion 11 .
  • the white LED completed device 21 was produced.
  • the chromaticity can be corrected to a chromaticity in the desired chromaticity range by the selected filter provided in the colored portion 11 .
  • the ratio R, G, B in the chromaticity of a white LED device 20 is R 2 :G 2 :B 2
  • the ratio R, G, B of the filter characteristic of the dye in the colored layer 11 is r:g:b
  • the filter characteristic ratio R, G, B of r:g:b can be set to a desired value by selecting the color of the dye, kind of the solution, concentration, immersi n time.
  • FIG. 14 is a perspective view showing a back light unit for illuminating an LCD (liquid crystal display) in which the white LED completed device 21 is used
  • FIG. 15 is a sectional view of the back light unit.
  • the back light unit 40 comprises a pair of white light emitting LED devices 21 , a lighting panel 22 , a diffusion panel 23 , a Py prism sheet 24 , a Px prism sheet 25 , a reflection plate 26 , and a color LCD 27 .
  • the lighting panel 22 is made of a transparent plastic and has an upper surface 22 a , lower surface 22 b and front side 22 c .
  • the white light emitting LED devices 21 are mounted on an LED substrate 21 b and disposed opposite the front side 22 c as edge light.
  • the diffusion panel 23 is disposed above the upper surface 22 a of the lighting panel 22 and the reflection plate 26 is disposed below the lower surface 22 b.
  • the white light emitted from the LED devices 21 enters the lighting panel 22 from the front side 22 c.
  • the entered light is repeatedly reflected by the upper and lower surfaces 22 a and 22 b .
  • the light is diffusely reflected by the prism surface of the lower surface 22 b and discharged from the upper surface 22 a.
  • a crease or uneven surface may be used.
  • the discharged direction of the light is arranged in a small range by the diffusion panel 23 , and further arranged by the prism sheets 24 and 25 in the Y and X-directions, and finally arranged in the Z-direction.
  • the light arranged in the Z-direction illuminates the LCD 27 .
  • the chromaticity of the illuminating light is the same as that of the white LED device 21 .
  • the chromaticity of the transmittance of the color filter in the color LCD 27 is the chromaticity at a chromaticity point d 0 in FIG. 4.
  • the ratio R, G, B of the illuminating light color to the LCD 27 is as follows from the chromaticity (x 1 , y 1 , z 1 ) of the white LED device 21 and the chromaticity (xf, yf, zf) of the color filter in the LCD 27 .
  • the LED device of the second embodiment is provided for emitting color light other than white light.
  • the filter characteristic of the colored layer 11 of the LED completed device is calculated from the ratio of R, G, B in the chromaticities at the points c 2 and c 3 by using the formula (1).
  • the characteristic is shown in FIG. 17 by F 2 .
  • H 2 shows a spectrum of the light emitted from the LED device
  • H 3 shows a spectrum of the light emitted from the LED completed device. As shown by H 3 , the light has red color.
  • the line ST in FIG. 4 shows a locus of single color lights.
  • LED completed devices emitting a plurality of single color lights such as red, yellow, green, blue, violet and others can be produced.
  • LED devices each having a desired chromaticity can be produced, so that the yield of the LED device is increased.

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JP2002249934A JP4360788B2 (ja) 2002-08-29 2002-08-29 液晶表示板用のバックライト及びそれに用いる発光ダイオードの製造方法

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US7141442B2 (en) 2006-11-28

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