TWI487146B - Light emitting diode lamp - Google Patents

Description

Light-emitting diode lighting device

The invention relates to a lighting device, in particular to a lighting diode lighting device.

The light-emitting diode is a kind of solid light source with energy saving, environmental protection and long life. Therefore, the research on the light-emitting diode technology has been very active in the past decade, and the light-emitting diode has gradually replaced the traditional light source such as fluorescent lamp and incandescent lamp.

In the prior art, a white light source is usually formed by exciting a phosphor powder from a light-emitting diode wafer, and a different white light source of different color rendering is formed using different phosphor powders. However, the use of a light-emitting diode wafer to excite the phosphor powder causes a decrease in the luminous efficiency of the light source, and different phosphor powders have different effects on the luminous efficiency. Generally, the higher the color rendering property, the lower the luminous efficiency of the white light source. For example, referring to FIG. 1, the white light generated by the yellow phosphor powder doped with yttrium aluminum garnet (YAG) using a blue LED chip can obtain a higher luminous flux, and the luminous efficiency is higher, but the color rendering property is relatively poor; The white light generated by the red-green phosphor powder is excited by the blue LED chip, and the color rendering property is higher due to the increase of the red component in the spectrum. However, since the conversion efficiency of the red phosphor powder is low, the luminous efficiency of the entire device is lowered. Therefore, how to provide a light-emitting diode lighting device that can balance the balance between luminous efficiency and color rendering is a technical problem that the industry needs to solve.

In view of this, it is necessary to provide a balance between the luminous efficiency and the color rendering. Adjusted light-emitting diode lighting device.

A light emitting diode lighting device includes at least one first white light source and at least one second white light source. The first white light source has a luminous efficiency of V1, a color rendering value of C1, a luminous efficiency of the second white light source of V2, and a color rendering value of C2, wherein V1 is less than V2 and C1 is greater than C2. The light emitted by the LED illumination device is generated by mixing white light emitted by the first white light source and the second white light source.

The above-mentioned light-emitting diode lighting device mixes the light generated by the first white light source with higher color rendering property and the second white light source with higher luminous efficiency, and the white light generated after mixing can balance the luminous efficiency and the color rendering property. Coordination makes the luminous efficiency and color rendering of the LED illumination device reach a better value. In addition, the color rendering and brightness values of the LED lighting device can be changed by adjusting the position and quantity of the first white light source and the second white light source to meet the needs of various occasions.

100‧‧‧Lighting diode lighting device

10‧‧‧ Pedestal

20‧‧‧First white light source

30‧‧‧second white light source

11‧‧‧ top surface

12‧‧‧ bottom

13‧‧‧容杯

14‧‧‧Protruding

Figure 1 is a graph showing the color rendering and luminous efficiency of a white light source.

2 is a plan view showing the structure of a light-emitting diode lighting device according to an embodiment of the present invention.

3 is a cross-sectional structural view of the illuminating diode device of FIG. 2 along the II-II direction.

4 is a graph showing color rendering and luminous efficiency of a light-emitting diode lighting device according to an embodiment of the present invention.

The invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 2 and FIG. 3, a preferred embodiment of the present invention provides a light emitting diode lighting device 100 including a base 10 and a plurality of first ones disposed in the base. The white light source 20 and the plurality of second white light sources 30.

The pedestal 10 includes a top surface 11 and a bottom surface 12, and the pedestal 10 defines a receiving cup 13 from the top surface 11 along the bottom surface 12. The inner surface of the accommodating cup 13 is an inclined surface, and the inclined surface is from the top surface. 11 extends in the direction of the bottom surface 12 and is inclined inward in the radial direction of the accommodating cup 13, so that the entire accommodating cup 13 is wide and narrow, and has a funnel shape. A plurality of first white light sources 20 and a plurality of second white light sources 30 are staggered on the bottom surface of the receiving cup 13. A plurality of protrusions 14 are formed on the inner surface of the receiving cup 13, and the protrusions 14 are closely arranged on the inner surface of the receiving cup 13 for scattering the first white light source 20 and the second white light source 30. The emitted light enables the light emitted by the first white light source 20 and the second white light source 30 to be better mixed to improve the light extraction efficiency. Preferably, the protrusion 14 on the inner surface of the receiving cup 13 is further coated with a light-reflecting material for enhancing the scattering effect.

The first white light source 20 includes a blue LED chip and a red-green phosphor that covers the light path of the blue LED chip, and the blue LED chip excites the red-green phosphor to generate a first white light. The second white light source 30 includes a blue LED chip and a yellow phosphor covering the light path of the blue LED chip, and the blue LED chip excites the yellow phosphor to produce a second white light. The first white light source 20 has a luminous efficiency of V1, a color rendering value of C1, a second white light source 30 having a luminous efficiency of V2, and a color rendering value of C2, wherein V1 is less than V2 and C1 is greater than C2. This is because the red fluorescent powder component is added to the spectrum of the first white light source 20, and the color rendering property is high. At the same time, since the conversion efficiency of the red fluorescent powder is low, the luminous efficiency is low; and the second white light is low. The light source 30 excites only a single yellow phosphor, so that its luminous efficiency is higher and the color rendering property is relatively low.

It can be understood that the number of the first white light source 20 and the second white light source 30 may also be only one.

In other embodiments, the first white light source 20 may be composed of a plurality of red, green, and blue primary color LED chips, and the red, green, and blue primary color LED chips emit light to synthesize the first white light. In addition, the first white light source 20 may also include a UVLED wafer and red, green, and blue phosphors. The UV light emitted by the UV LED chip excites the red, green, and blue phosphors to produce a first white light. Furthermore, the first white light source 20 may be composed of a blue LED chip and a green LED chip plus red phosphor powder. The blue LED chip and the green LED chip are excited by red phosphor powder to produce the first type. White light.

In use, the white light generated by the first white light source 20 and the second white light source 30 in the light-emitting diode illumination device 100 is scattered by the protrusions 14 on the inner wall of the receiving cup 13, mixed, and then emitted to the light-emitting diode illumination. Outside the device 100. Referring to FIG. 4, point A represents the luminous efficiency and color rendering of the first white light source 20 and the second white light source 30, and point B represents the luminous efficiency and color rendering of the first white light source 20, and point C represents The luminous efficiency and color rendering of the second white light source 30 can be seen from FIG. 4 that the color rendering of the white light generated after the mixing of the first white light source 20 and the second white light source 30 is generated relative to the use of the second white light source 30 alone. The white light has a higher color rendering property, and the luminous efficiency is higher than that of the first white light source 20 alone. Therefore, due to the mixing of the first white light source 20 and the second white light source 30, the white light generated finally can balance the balance between the luminous efficiency and the color rendering, so that the luminous efficiency and the color rendering property are both achieved. A preferred value can also be used to change the color rendering and brightness of the LED illumination device 100 by adjusting the position and quantity of the first white light source 20 and the second white light source 30. The need for the occasion.

Compared with the prior art, the LED lighting device of the present invention mixes the light generated by the first white light source with higher color rendering and the second white light source with higher luminous efficiency. The white light generated after mixing can balance the luminous efficiency and the color rendering property, so that the luminous efficiency and color rendering of the LED illumination device reach a better value. In addition, the color rendering and brightness values of the LED lighting device can be changed by adjusting the position and quantity of the first white light source and the second white light source to meet the needs of various occasions.

In addition, those skilled in the art can make other changes in the spirit of the present invention. Of course, the changes made in accordance with the spirit of the present invention should be included in the scope of the present invention.

100‧‧‧Lighting diode lighting device

10‧‧‧ Pedestal

20‧‧‧First white light source

30‧‧‧second white light source

13‧‧‧容杯

Claims (8)

A light-emitting diode lighting device comprising at least one first white light source and at least one second white light source, wherein the first white light source has a luminous efficiency of V1, a color rendering value of C1, and a luminous efficiency of the second white light source For V2, the color rendering value is C2, wherein the number of the first white light source and the second white light source is plural, and the plurality of first white light source and the second white light source are alternately arranged, and V1 is smaller than V2, and C1 is greater than C2, the light emitted by the LED illumination device is generated by mixing white light emitted by the first white light source and the second white light source. The illuminating diode illuminating device of claim 1, wherein: the first white light source comprises a blue LED chip and a red-green phosphor; the second white light source comprises a blue LED chip and yellow fluorescent light powder. The illuminating diode illuminating device of claim 1, wherein: the first white light source is composed of a plurality of red, green and blue primary color LED chips; the second white light source comprises a blue LED chip and yellow Fluorescent powder. The illuminating diode illuminating device of claim 1, wherein: the first white light source comprises a UV LED chip and red, green and blue phosphor powder; the second white light source comprises a blue LED chip and yellow Fluorescent powder. The illuminating diode illuminating device of claim 1, wherein: the first white light source is composed of a blue LED chip and a green LED chip plus red phosphor powder; and the second white light source comprises Blue LED chip and yellow phosphor powder. The illuminating diode illuminating device of claim 1, wherein the illuminating diode illuminating device further comprises a pedestal, the pedestal opening a recess to form a receiving cup, the first white light source and The second white light source is staggered on the bottom surface of the receiving cup. The illuminating diode lighting device of claim 6, wherein: the accommodating cup The inner surface is an inclined surface extending from the top surface of the base toward the bottom surface and inclined inward in the radial direction of the accommodating cup, and the inclined surface is further formed with a plurality of protrusions. The illuminating diode lighting device of claim 7, wherein the protrusion is further coated with a reflective material.