STRUCTURE OF LIGHT-EMITTING DIODE (LED) HAVING HIGH COLOR RENDERING INDEX

• US 20120092862A1
• Filed: 10/13/2010
• Published: 04/19/2012
• Est. Priority Date: 10/13/2010
• Status: Abandoned Application

• Current Assignee: Ecolighting, Inc.
• Original Assignee: Ecolighting, Inc.
• Inventors: CHUANG, SHIH-JEN, Chang, Han-Chi
• Application Number:
  US12/903,208
• Publication Number:
  US 20120092862A1
• Time in Patent Office: Days
• US Class Current: 362/231
• 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]

Abstract

Disclosed is a structure of light-emitting diode (LED) having high color rendering index, including a substrate on which at least one light emission element, at least one red light emission element, and at least one green light emission element are mounted. The light emission element emits blue light that is also applied to excite a fluorescent powder coated outside the light emission element to generate white light, which when mixed with red and green lights from the red and green light emission elements, form a light source of improved color rendering property. With the addition of the red and green light emission elements, the light projecting from the LED structure provides a color performance close to the natural light, allowing for perfect reproduction of the original color of an object and thereby improving conformableness and coordination of human perception without causing any lose of color genuineness of an object.

Claims

1. A structure of light-emitting diode (LED) having high color rendering index, comprising:

a substrate;

at least one light emission element, which is mounted on the substrate, the light emission element being a blue light source that emits blue light that excite a fluorescent powder coated outside the light emission element to generate white light;

at least one red light emission element, which is mounted on the substrate to emit red light for mixing with the white light; and

at least one green light emission element, which is mounted on the substrate to emit green light for mixing with the white light and red light.

2. The structure of LED having high color rendering index according to claim 1, wherein the light emission element comprises a blue die that excites yellow fluorescent powder to generate yellowish green light having a wavelength between 545 nm and 585 nm for mixing with the blue light that has a wavelength between 430 nm and 480 nm.

3. The structure of LED having high color rendering index according to claim 1, wherein the red light emitted from the red light emission element has a wavelength between 595 nm and 640 nm.

4. The structure of LED having high color rendering index according to claim 1, wherein the green light emitted from the green light emission element has a wavelength between 500 nm and 550 nm.

5. The structure of LED having high color rendering index according to claim 1, wherein the fluorescent powder comprises yellowish green fluorescent powder.

6. The structure of LED having high color rendering index according to claim 1, wherein the light emission element comprises a white light LED.

7. The structure of LED having high color rendering index according to claim 1, wherein the red light emission element comprises a red light LED.

8. The structure of LED having high color rendering index according to claim 1, wherein the green light emission element comprises a green light LED.