Illumination device, illumination equipment, and display device

• US 10,018,776 B2
• Filed: 04/10/2014
• Issued: 07/10/2018
• Est. Priority Date: 04/15/2013
• Status: Expired due to Fees

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Itoh, Masayuki, Umeda, Hiroshi, Tamaki, Kazuo, Okano, Masanobu, Shibata, Yusuke, Onozaki, Manabu, Yamashita, Atsushi
• Primary Examiner(s): Sember, Thomas M
• Application Number:
  US14/783,527
• Publication Number:
  US 20160062023A1
• Time in Patent Office: 1,552 Days
• CPC Class Codes: F21Y 2105/00 Planar light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 6/0026 Wavelength selective element, sheet or layer, e.g. filter or grating
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G02B 6/0083 Details of electrical connections of light sources to drivers, circuit boards, or the like
• CPC Class Codes: G02B 6/009 of the light source in the package G02B6/0021 takes precedence
• CPC Class Codes: G02B 6/0091 of the light source relative to the light guide G02B6/0021 takes precedence
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials

Abstract

An illumination device (11) includes a light guide plate (15) and a light source unit (10) which includes a substrate (12) and a plurality of LED chips (16) disposed on the substrate (12), and which is disposed in a position at which emitted light of the LED chips (16) enters a light entrance portion (15a) of the light guide plate (15). The LED chips (16) are disposed to form a plurality of rows on the substrate (12), and are disposed to line up in a direction which orthogonally intersects the rows between each of the rows.

Claims

1. An illumination device, comprising:

a light guide plate; and

a light source unit which includes a substrate and a plurality of LED chips disposed on the substrate, and which is disposed such that emitted light of the LED chips enters a light entrance portion of the light guide plate,

wherein the LED chips are disposed to form a first row and a second row parallel to each other on the substrate, and are disposed to line up in an orthogonal direction orthogonally intersecting a direction of the first row and the second row,

wherein the light source unit further includes a single package in which two of the LED chips which are adjacent in the orthogonal direction are stored,

wherein a shape of each of the LED chips an elongated rectangle, and a longitudinal direction of each of the LED chips and a longitudinal direction of the substrate are a same direction.

2. The illumination device according to claim 1, wherein the LED chips are optically isolated from each other, and luminescent colors thereof are the same.

3. The illumination device according to claim 2, wherein the LED chips form an LED which emits white light by being combined with a phosphor.

4. The illumination device according to claim 1, wherein the LED chips which are adjacent in the orthogonal direction are combined with a different phosphor for each of the first row and the second row.

5. The illumination device according to claim 4, wherein combinations of the LED chips and the phosphors emit light of two chromaticity points on a black-body radiation curve.

6. The illumination device according to claim 4,

wherein the LED chips which are adjacent in the orthogonal direction are blue LED chips, where one of the LED chips is combined with a red phosphor, and other one of the LED chips is combined with a green phosphor.

7. The illumination device according to claim 6,

wherein the one of the LED chips has a peak wavelength suitable for an optimal excitation wavelength of the red phosphor, and the other one of the LED chips has a peak wavelength suitable for an optimal excitation wavelength of the green phosphor.

8. The illumination device according to claim 1,

wherein one of the LED chips which are adjacent in the orthogonal direction is a green LED chip, and another one of the LED chips is a blue LED chip, and

wherein the blue LED chip is combined with a red phosphor.

9. The illumination device according to claim 1,

wherein the LED chips are blue LED chips and are combined with a red phosphor and a green phosphor,

wherein combinations of two of the LED chips which are adjacent in the orthogonal direction and the red phosphor and the green phosphor form each of a first light source and a second light source,

wherein the first light source emits white light of any chromaticity from incandescent which has a color temperature of 2400 K to daylight which has a color temperature of 7000 K, and

wherein the second light source emits light with a chromaticity within a range surrounded by, on an xy chromaticity diagram, in relation to point A (0.555, 0.394) and point B (0.419, 0.343), a first isotemperature line and a first isanomalous line in relation to a black-body radiation locus which pass through the point A, and a second isotemperature line and a second isanomalous line in relation to the black-body radiation locus which pass through the point B (0.419, 0.343).

10. The illumination device according to claim 1,

wherein the LED chips are blue LED chips,

wherein, one of the two LED chips which are adjacent in the orthogonal direction, one of the LED chips has a peak wavelength of 415 nm to less than 460 nm and is combined with a red phosphor and a green phosphor, and

wherein other one of the LED chips has a peak wavelength of 460 nm to 500 nm and is not combined with the phosphors.

11. The illumination device according to claim 1,

wherein the LED chips are blue LED chips,

wherein, one of the two LED chips which are adjacent in the orthogonal direction, one of the LED chips has a peak wavelength of 350 nm to 410 nm and is combined with a red phosphor and a green phosphor, and

wherein another one of the LED chips is not combined with the phosphors.

12. The illumination device according to claim 1,

wherein the LED chips are blue LED chips and are combined with a red phosphor and a green phosphor,

wherein combinations of the two LED chips which are adjacent in the orthogonal direction and the red phosphor and the green phosphor form each of a first light source and a second light source,

wherein the first light source contains a forbidden transition type phosphor material as the red phosphor, and

wherein the second light source contains an allowed transition type phosphor material as the red phosphor.

13. The illumination device according to claim 1,

wherein the LED chips are blue LED chips and are combined with a red phosphor and a green phosphor,

wherein combinations of the two LED chips which are adjacent in the orthogonal direction and the red phosphor and the green phosphor form each of a first light source and a second light source,

wherein the first light source contains a forbidden transition type phosphor material as the red phosphor and the green phosphor, and

wherein the second light source contains an allowed transition type phosphor material as the red phosphor and the green phosphor.

14. Illumination equipment comprising the illumination device according to claim 1.

15. A display device comprising the illumination device according to claim 1 is a backlight.

16. The illumination device according to claim 1,

wherein the package has a first concave portion, a second concave portion, and a partition provided between the first concave portion and the second concave portion,

wherein the partition is present between the first row and the second row,

wherein at least one of the LED chips forming the first row is provided in the first concave portion, and

wherein at least one of the LED chips forming the second row is provided in the second concave portion.

17. The illumination device according to claim 16, further comprising:

a first light source formed by sealing the at least one of LED chips in the first concave portion with resin; and

a second light source formed by sealing the at least one of LED chips in the second concave portion with resin,

wherein a light emitting surface of the first light source has a shape of either a rectangle or a rectangle with one corner portion cut out, and a longitudinal direction of the light emitting surface of the first light source and the longitudinal direction of the substrate are a same direction, and

wherein a light emitting surface of the second light source has a shape of either a rectangle or a rectangle with one corner portion cut out, and a longitudinal direction of the light emitting surface of the second light source and the longitudinal direction of the substrate are a same direction.

18. The illumination device according to claim 1,

wherein the package has a rectangular appearance, and

wherein a longitudinal direction of the package and the longitudinal direction of the substrate are a same direction.

19. An illumination device, comprising:

a light guide plate; and

a light source unit which includes a substrate and a plurality of LED chips disposed on the substrate, and which is disposed such that emitted light of the LED chips enters a light entrance portion of the light guide plate,

wherein the LED chips are disposed to form a first row, a second row, and a third row parallel to each other on the substrate, and are disposed to line up in an orthogonal direction orthogonally intersecting a direction of the first row, the second row, and the third row,

wherein the light source unit further includes a single package in which three of the LED chips which are adjacent in the orthogonal direction are stored, and

wherein a shape of each of the LED chips is an elongated rectangle, and a longitudinal direction of each of the LED chips and a longitudinal direction of the substrate are a same direction.

20. The illumination device according to claim 19,

wherein the package has a first concave portion, a second concave portion, a third concave portion, a first partition provided between the first concave portion and the second concave portion, and a second partition provided between the second concave portion and the third concave portion,

wherein the first partition is present between the first row and the second row,

wherein the second partition is present between the second row and the third row,

wherein at least one of LED chips forming the first row is provided in the first concave portion,

wherein at least one of LED chips forming the second row is provided in the second concave portion, and

wherein at least one of LED chips forming the third row is provided in the third concave portion.

21. The illumination device according to claim 20, further comprising:

a first light source formed by sealing the at least one of LED chips in the first concave portion with resin;

a second light source formed by sealing the at least one of LED chips in the second concave portion with resin; and

a third light source formed by sealing the at least one of LED chips in the third concave portion with resin,

wherein a light emitting surface of the first light source has a shape of either a rectangle or a rectangle with one corner portion cut out, and a longitudinal direction of the light emitting surface of the first light source and the longitudinal direction of the substrate are a same direction,

wherein a light emitting surface of the second light source has a shape of either a rectangle or a rectangle with one corner portion cut out, and a longitudinal direction of the light emitting surface of the second light source and the longitudinal direction of the substrate are a same direction, and

wherein a light emitting surface of the third light source has a shape of either a rectangle or a rectangle with one corner portion cut out, and a longitudinal direction of the light emitting surface of the third light source and the longitudinal direction of the substrate are a same direction.