Claims
- 1. A light source system comprising:a light source to emit light; an optical guide member; and a coating containing a color converting material, wherein said light source comprises a nitride compound semiconductor represented by the formula: IniGajAikN where 0≦i 0≦j, 0≦k and i+j+k=1 including InGaN and Gan, doped with various impurities, emitting blue light, with a main emission peak set within the range from 400 nm to 530 nm, wherein said coating filters by absorption a first part of the blue light coming from said light source, transmits a second part of the blue light coming from said light source, converts the absorbed blue light to a new light of longer wavelength and blends this new light to the transmitted part of the blue light coming from said light source, so as to radiate a light combination; wherein said optical guide member is used to receive the light from said light source at a first surface of said optical guide member and to emit light in a planar state at a second surface of said optical guide member; and wherein said coating is disposed at least in an outer vicinity of said first surface of said optical guide member or in an outer vicinity of said second surface of said optical guide member.
- 2. A light source system according to claim 1,wherein said color converting material consists of one, two or more garnet fluorescent materials according to the general formula: (Re1−rSmr)3(Al1−sGas)5O12:Ce where 0≦r<1 0≦s≦1 Re is at least one selected from Y and Gd, and where at least one material contained in the color converting material has r≠0.
- 3. A light source system according to claim 1, wherein said main emission peak of said nitride compound semiconductor is set within the range of 420 nm to 490 nm.
- 4. A light source system according to claim 1, wherein said light combination is white.
- 5. A light source system according to claim 1, wherein said light source is arranged in a C-shaped enclosure in the outer vicinity of said first surface of said optical guide member.
- 6. A light source system according to claim 1, further comprising a light scattering sheet arranged on said second surface of said optical guide member.
- 7. A light source system according to claim 5, wherein said coating is formed by mixing said color converting material with epoxy resin.
- 8. A light source system according to claim 5, wherein said coating is applied to the C-shaped enclosure.
- 9. A light source system according to claim 6, wherein said coating is formed by spreading a binder with said color converting material over the scattering sheet.
- 10. A light source system according to claim 1, wherein said coating is formed in dots or sheet directly on said optical guide member.
- 11. A light source system according to claim 6, wherein said scattering sheet contains said color converting material.
- 12. A light source system according to claim 1, wherein said optical guide member is provided with reflectors on a third surface opposing said second surface of said optical guide member or on a fourth surface opposing the light source.
- 13. A light source system according to claim 1, wherein said light source system is used to illuminate a liquid crystal display.
- 14. A light source system according to claim 1, wherein said light source includes a light emitting component in the form of a light emitting diode (LED) for emitting a first color light,wherein said optical guide member includes a light emitting plate or lens for receiving light at one of its faces and emitting light from a different one of its faces, wherein said coating containing the color converting material is positioned between said LED and said optical guide member, wherein said color converting material changes a part of the light from said LED into light of a different color, and transmits another part of the light from said LED unaffected, and wherein said light emitting plate or lens mixes the two parts of said light from said coating containing the color converting material, and emits the mixed light from a main face of said light emitting plate or lens.
- 15. A display device, comprising:a light emitting component in the form of a light emitting diode (LED) for emitting a first color light; and a light emitting plate for receiving the light from the LED at a first face and emitting light at a different second face, wherein an element containing a phosphor is positioned between said LED and said light emitting plate, so as to make a part of the emitted light from said LED change into a different color, and to make remainder of the emitted light pass through said element without change, and wherein said light emitting plate is adapted to mix parts of the light injected from said element and to emit the mixed light from said second face of said light emitting plate in a planar state.
- 16. A light source system according to claim 1, wherein said coating covers said light source disposed in the outer vicinity of said first surface of said optical guide member and is further spread out entirely on said first surface of said optical guide member.
- 17. A display device according to claim 15, wherein said LED is arranged in a C-shaped enclosure.
- 18. A display device according to claim 15, wherein said first color light is a blue light and the mixed light is a white light.
Priority Claims (5)
Number |
Date |
Country |
Kind |
8-198585 |
Jul 1996 |
JP |
|
8-244339 |
Sep 1996 |
JP |
|
8-245381 |
Sep 1996 |
JP |
|
8-359004 |
Dec 1996 |
JP |
|
9-081010 |
Mar 1997 |
JP |
|
Parent Case Info
This application is a divisional of co-pending application Ser. No. 09/458,024, filed on Dec. 10, 1999, the entire contents of which are hereby incorporated by reference, which is a divisional of Ser. No. 09/300,315, filed on Apr. 28, 1999, now U.S. Pat. No. 6,069,440, which is a divisional of Ser. No. 08/902,725, filed Jul. 29, 1997, now U.S. Pat. No. 5,998,925.
US Referenced Citations (11)
Number |
Name |
Date |
Kind |
3691482 |
Pinnow et al. |
Sep 1972 |
A |
3699478 |
Pinnow et al. |
Oct 1972 |
A |
4298820 |
Bongers et al. |
Nov 1981 |
A |
4550256 |
Berkstresser et al. |
Oct 1985 |
A |
4716337 |
Huiskes et al. |
Dec 1987 |
A |
4727283 |
van Kemenade et al. |
Feb 1988 |
A |
5471113 |
De Backer et al. |
Nov 1995 |
A |
5550657 |
Tanaka et al. |
Aug 1996 |
A |
5578839 |
Nakamura et al. |
Nov 1996 |
A |
5798537 |
Nitta |
Aug 1998 |
A |
6004001 |
Noll |
Dec 1999 |
A |
Foreign Referenced Citations (25)
Number |
Date |
Country |
47 17684 |
Sep 1972 |
JP |
49 1221 |
Jan 1974 |
JP |
49 112577 |
Oct 1974 |
JP |
50 43913 |
Apr 1975 |
JP |
5043913 |
Apr 1975 |
JP |
554898 |
Jan 1980 |
JP |
A 60144381 |
Jul 1985 |
JP |
62 189770 |
Feb 1986 |
JP |
6220237 |
Jan 1987 |
JP |
A 62167387 |
Jul 1987 |
JP |
2 91980 |
Sep 1988 |
JP |
01179471 |
Jul 1989 |
JP |
05152609 |
Jun 1993 |
JP |
5-152609 |
Jun 1993 |
JP |
51 52609 |
Jun 1993 |
JP |
51 83189 |
Jul 1993 |
JP |
A 06177423 |
Jun 1994 |
JP |
A 6208845 |
Jul 1994 |
JP |
A 06260680 |
Sep 1994 |
JP |
A 06268257 |
Sep 1994 |
JP |
07099345 |
Apr 1995 |
JP |
07176794 |
Jul 1995 |
JP |
7-176794 |
Jul 1995 |
JP |
08007614 |
Jan 1996 |
JP |
09027642 |
Jan 1997 |
JP |
Non-Patent Literature Citations (8)
Entry |
Wustlich Mikro-/Opto-Elektronik GMBH (1994/1995). |
Glasse et al., Applied Physics Letters, vol. 11, No. 2, pp. 53-54 (1967). |
Hoffman, Journal of Ies, pp. 89-91 (1977). |
Nakamura, SPIE, vol. 3002, pp. 26-35 (1997). |
“Simens SMT-Topled fur die Oberflachenmontage” Frank Mollmer et al. Simens Components, 29 (1991) Hfet 4. |
Tadao Miura, Electronics Engineering, “High-intensity White Backlighting for LCD of Car Audios”, Jul. 1996, vol. |
J.M. Robertson, et al. “Colourshift of the Ce3+Emission in Monocrystalline Epitaxially Grown Garnet Layers”, 1981 Philips J. Res. |
W.W. Halloway, Jr. et al. “Optical Properties of Cerium-Activated Garnet Crystals”, 1969 Journal of the Optical Society of. |