Array type light-emitting device with high color rendering index

• US 20090152572A1
• Filed: 12/17/2007
• Published: 06/18/2009
• Est. Priority Date: 12/17/2007
• Status: Active Grant

• Current Assignee: Ledtech Electronics Corp.
• Original Assignee: Ledtech Electronics Corp.
• Inventors: Liu, Hsin-Chun, Su, Chih-Liang, Wang, Fang-Po
• Granted Patent: US 7,655,954 B2
• Time in Patent Office: Days
• US Class Current: 257/89
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/12 characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details

Abstract

An array type light-emitting device includes a substrate, an array type light-emitting module, a wavelength-converting layer set, and a plurality of transparent layer sets. The array type light-emitting module is composed of a blue, a red, a green, a yellow and an amber light-emitting chip sets. The wavelength-converting layer set is covered on the blue light-emitting chip set. The transparent layer sets are respectively covered on the red, the green, the yellow, the amber light-emitting chip sets. Therefore, a part of visible light emitted by the blue light-emitting chip set is absorbed and converted into visible light with another emission peak wavelength range via the wavelength-converting layer set, and the visible light mixes with projecting light projected from the red, the green, the yellow and the amber light-emitting chip sets to make the array type light-emitting device generate white light with a color rendering index of between 90 and 96.

Claims

1. An array type light-emitting device with high color rendering index, comprising:

a substrate;

an array type light-emitting module electrically disposed on the substrate, wherein the array type light-emitting module is composed of a blue light-emitting chip set, a red light-emitting chip set, a green light-emitting chip set, a yellow light-emitting chip set, and an amber light-emitting chip set;

a wavelength-converting layer set covered on the blue light-emitting chip set; and

a plurality of transparent layer sets respectively covered on the red light-emitting chip set, the green light-emitting chip set, the yellow light-emitting chip set, and the amber light-emitting chip set;

whereby, a part of visible light emitted by the blue light-emitting chip set is absorbed and converted into visible light with another emission peak wavelength range via the wavelength-converting layer set, and the visible light with another emission peak wavelength range mixes with projecting light projected from the red, the green, the yellow and the amber light-emitting chip sets to make the array type light-emitting device generate white light with a color rendering index of between 90 and 96.

2. The array type light-emitting device as claimed in claim 1, wherein the blue light-emitting chip set has an emission wavelength range between 450 nm and 460 nm, the red light-emitting chip set has an emission wavelength range between 620 nm and 630 nm, the green light-emitting chip set has an emission wavelength range between 520 nm and 540 nm, the yellow light-emitting chip set has an emission wavelength range between 585 nm and 595 nm, and the amber light-emitting chip set has an emission wavelength range between 600 nm and 610 nm

3. The array type light-emitting device as claimed in claim 1, wherein the wavelength-converting layer set is a mixture of yellow phosphor powders and a package colloid, and light projected from the blue light-emitting chip set is absorbed and converted into projected light with a color temperature range between 2800K and 10000K via the wavelength-converting layer set.

4. The array type light-emitting device as claimed in claim 1, wherein the wavelength-converting layer set is a mixture of orange and green phosphor powders and a package colloid, and light projected from the blue light-emitting chip set is absorbed and converted into projected light with a color temperature range between 2800K and 10000K via the wavelength-converting layer set.

5. The array type light-emitting device as claimed in claim 1, wherein the wavelength-converting layer set is composed of a plurality of first and second wavelength-converting layers, the first wavelength-converting layers are mixtures of yellow phosphor powders and a package colloid, and light projected from the blue light-emitting chip set is absorbed and converted into projected light with a color temperature range between 2800K and 10000K via the first wavelength-converting layers;

wherein the second wavelength-converting layers are mixtures of green phosphor powders and a package colloid, and light projected from the blue light-emitting chip set is absorbed and converted into projected light with an emission peak wavelength range between 480 nm and 495 nm via the second wavelength-converting layers.

6. The array type light-emitting device as claimed in claim 1, wherein the wavelength-converting layer set is composed of a plurality of first and second wavelength-converting layers, the first wavelength-converting layers are mixtures of orange and green phosphor powders and a package colloid, and light projected from the blue light-emitting chip set is absorbed and converted into projected light with a color temperature range between 2800K and 10000K via the first wavelength-converting layers;

wherein the second wavelength-converting layers are mixtures of green phosphor powders and a package colloid, and light projected from the blue light-emitting chip set is absorbed and converted into projected light with an emission peak wavelength range between 480 nm and 495 nm via the second wavelength-converting layers.

7. The array type light-emitting device as claimed in claim 1, wherein the blue light-emitting chip set is composed of eight blue LED chips, the red light-emitting chip set is one red LED chip, the green light-emitting chip set is composed of four green LED chips, the yellow light-emitting chip set is one yellow LED chip, and the amber light-emitting chip set is composed of two amber LED chips;

wherein the array type light-emitting module is composed of a first light-emitting chip row, a second light-emitting chip row, a third light-emitting chip row and a fourth light-emitting chip row;

wherein the first light-emitting chip row is composed of two blue LED chips, one green LED chip and one amber LED chip, the second light-emitting chip row is composed of two blue LED chips, one green LED chip and one red LED chip, the third light-emitting chip row is composed of two blue LED chips, one green LED chip and one yellow LED chip, and fourth light-emitting chip row is composed of two blue LED chips, one green LED chip and one amber LED chip;

wherein each blue LED chip and each green LED chip have a voltage rating between 2.9 V and 4.0 V, and the red LED chip, the yellow LED chip and each amber LED chip have a voltage rating between 1.8 V and 2.8 V.

8. The array type light-emitting device as claimed in claim 1, wherein the array type light-emitting module is composed of a plurality of light-emitting chip rows, and each light-emitting chip row has a plurality of LED chips;

wherein the light-emitting chip rows are electrically connected in parallel disposed on the substrate, and the LED chips of each light-emitting chip row are electrically connected in series disposed on the substrate;

wherein the array type light-emitting module is composed of four light-emitting chip rows, each light-emitting chip row has at least two blue LED chips and at least two LED chips selected from the group consisting of the LED chips of the red light-emitting chip set, the green light-emitting chip set, the yellow light-emitting chip set and the amber light-emitting chip set to form a 4×

4 array light-emitting module;

wherein a total voltage of each light-emitting chip row is 12 V.

9. The array type light-emitting device as claimed in claim 8, wherein the LED chips are separated from each other by a predetermined distance.

10. The array type light-emitting device as claimed in claim 8, wherein the substrate has a plurality of receiving grooves abutting against each other, and the LED chips are respectively received in the receiving grooves.

11. An array type light-emitting device with high color rendering index, comprising:

a substrate;

an array type light-emitting module electrically disposed on the substrate, wherein the array type light-emitting module is composed of a blue light-emitting chip set having eight blue LED chips, a red light-emitting chip set having two red LED chips, a green light-emitting chip set having four green LED chips, a yellow light-emitting chip set having a yellow LED chip, and an amber light-emitting chip set having an amber LED chip;

a wavelength-converting layer set covered on the blue light-emitting chip set, wherein the wavelength-converting layer set is composed of a plurality of first and second wavelength-converting layers, the first wavelength-converting layers are mixtures of orange and green phosphor powders and a package colloid, and the second wavelength-converting layers are mixtures of green phosphor powders and a package colloid; and

a plurality of transparent layer sets respectively covered on the red light-emitting chip set, the green light-emitting chip set, the yellow light-emitting chip set, and the amber light-emitting chip set;

whereby, light projected from the blue light-emitting chip set is absorbed and converted into projected light with a color temperature range between 2800K and 10000K via the first wavelength-converting layers, light projected from the blue light-emitting chip set is absorbed and converted into projected light with an emission peak wavelength range between 480 nm and 495 nm via the second wavelength-converting layers;

wherein the projected light passing through the wavelength-converting layer set mixes with projecting light projected from the red, the green, the yellow and the amber light-emitting chip sets to make the array type light-emitting device generate white light with a color rendering index of between 90 and 96.

12. The array type light-emitting device as claimed in claim 11, wherein the blue light-emitting chip set has an emission wavelength range between 450 nm and 460 nm, the red light-emitting chip set has an emission wavelength range between 620 nm and 630 nm, the green light-emitting chip set has an emission wavelength range between 520 nm and 540 nm, the yellow light-emitting chip set has an emission wavelength range between 585 nm and 595 nm, and the amber light-emitting chip set has an emission wavelength range between 600 nm and 610 nm

13. The array type light-emitting device as claimed in claim 11, wherein the array type light-emitting module is composed of a first light-emitting chip row, a second light-emitting chip row, a third light-emitting chip row and a fourth light-emitting chip row;

wherein the first light-emitting chip row is composed of two blue LED chips, one green LED chip and one amber LED chip, the second light-emitting chip row is composed of two blue LED chips, one green LED chip and one red LED chip, the third light-emitting chip row is composed of two blue LED chips, one green LED chip and one yellow LED chip, and fourth light-emitting chip row is composed of two blue LED chips, one green LED chip and one red LED chip;

wherein each blue LED chip and each green LED chip have a voltage rating between 2.9 V and 4.0 V, and the red LED chip, the yellow LED chip and each amber LED chip have a voltage rating between 1.8 V and 2.8 V;

wherein a total voltage of each light-emitting chip row is 12 V;

wherein the light-emitting chip rows are electrically connected in parallel disposed on the substrate, and the LED chips of each light-emitting chip row are electrically connected in series disposed on the substrate.

14. The array type light-emitting device as claimed in claim 13, wherein the LED chips are separated from each other by a predetermined distance.

15. The array type light-emitting device as claimed in claim 13, wherein the substrate has a plurality of receiving grooves abutting against each other, and the LED chips are respectively received in the receiving grooves.

16. An array type light-emitting device with high color rendering index, comprising:

a substrate;

an array type light-emitting module electrically disposed on the substrate, wherein the array type light-emitting module is composed of a blue light-emitting chip set having eight blue LED chips, a red light-emitting chip set having two red LED chips, a green light-emitting chip set having four green LED chips, a yellow light-emitting chip set having a yellow LED chip, and an amber light-emitting chip set having an amber LED chip;

a wavelength-converting layer set covered on the blue light-emitting chip set, wherein the wavelength-converting layer set is a mixture of orange and green phosphor powders and a package colloid; and

a plurality of transparent layer sets respectively covered on the red light-emitting chip set, the green light-emitting chip set, the yellow light-emitting chip set, and the amber light-emitting chip set;

whereby, light projected from the blue light-emitting chip set is absorbed and converted into projected light with a color temperature range between 2800K and 10000K via the wavelength-converting layer set;

wherein the projected light passing through the wavelength-converting layer set mixes with projecting light projected from the red, the green, the yellow and the amber light-emitting chip sets to make the array type light-emitting device generate white light with a color rendering index of between 90 and 96.

17. The array type light-emitting device as claimed in claim 16, wherein the blue light-emitting chip set has an emission wavelength range between 450 nm and 460 nm, the red light-emitting chip set has an emission wavelength range between 620 nm and 630 nm, the green light-emitting chip set has an emission wavelength range between 520 nm and 540 nm, the yellow light-emitting chip set has an emission wavelength range between 585 nm and 595 nm, and the amber light-emitting chip set has an emission wavelength range between 600 nm and 610 nm

18. The array type light-emitting device as claimed in claim 16, wherein the array type light-emitting module is composed of a first light-emitting chip row, a second light-emitting chip row, a third light-emitting chip row and a fourth light-emitting chip row;

wherein the first light-emitting chip row is composed of two blue LED chips, one green LED chip and one amber LED chip, the second light-emitting chip row is composed of two blue LED chips, one green LED chip and one red LED chip, the third light-emitting chip row is composed of two blue LED chips, one green LED chip and one yellow LED chip, and fourth light-emitting chip row is composed of two blue LED chips, one green LED chip and one red LED chip;

wherein each blue LED chip and each green LED chip have a voltage rating between 2.9 V and 4.0 V, and the red LED chip, the yellow LED chip and each amber LED chip have a voltage rating between 1.8 V and 2.8 V;

wherein a total voltage of each light-emitting chip row is 12 V;

wherein the light-emitting chip rows are electrically connected in parallel disposed on the substrate, and the LED chips of each light-emitting chip row are electrically connected in series disposed on the substrate.

19. The array type light-emitting device as claimed in claim 18, wherein the LED chips are separated from each other by a predetermined distance.

20. The array type light-emitting device as claimed in claim 18, wherein the substrate has a plurality of receiving grooves abutting against each other, and the LED chips are respectively received in the receiving grooves.