WO2015078361A1

WO2015078361A1 - Cross-reference to related application

Info

Publication number: WO2015078361A1
Application number: PCT/CN2014/092205
Authority: WO
Inventors: Xinxin SONG; Yaxuan SUN; Bo Wu
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2013-11-26
Filing date: 2014-11-25
Publication date: 2015-06-04
Anticipated expiration: 2016-05-26
Also published as: CN104676349A; CN104676349B

Abstract

An LED module includes a lamp frame (2) defining a first cavity therein, an LED light source (1) disposed in the lamp frame (2), a prism (3), a reflecting plate (4), a brightness enhancement plate (5) disposed above the reflecting plate (4), and a diffusing plate (6) disposed above the brightness enhancement plate (5). The LED light source (1) includes at least a white light LED and a red light LED. The prism (3) is disposed to seal the opening (21) of the first cavity and includes a light exiting surface (32) and a light incident surface (31) facing the LED light source (1). The reflecting plate (4) is disposed at a side of the prism (3) adjacent to the light exiting surface (32). The brightness enhancement plate (5) defines a sealed second cavity together with the prism (3) and the reflecting plate (4).

Description

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to, and benefits of Chinese Patent Application Serial No. 201310604832. X, filed with the State Intellectual Property Office of P. R. C. on November 26, 2013, the entire content of which is incorporated herein by reference.

FIELD

Exemplary embodiments of the present disclosure relate generally to an LED (light emitting diode) field, and more particularly to an LED module and an LED lamp.

BACKGROUND

Among existing LED lamps, a light emitting module of a white light LED generally uses blue lights to irradiate yellow fluorescent substances. This LED may not have required color rendering indexes (CRI) , and thus may not meet the requirements on excellent illumination. In light emitting modules of conventional LED lamps, white light LEDs, red light LEDs and green light LEDs are arranged with a certain amount ratio, or white light LEDs and red light LEDs are arranged with a certain amount ratio. The application of the above LED lamp may have some advantages such as a relative obvious increase of the CRI, but have some disadvantages such as a relative greater thickness, an unaesthetic appearance, an easier generation of glare, and a lack of softness on light. With an increasing attention on light comfort, an LED lamp with an aesthetic appearance and a smaller thickness needs to be provided.

Chinese patent application publication No. CN201198966Y discloses an LED lamp comprising a lamp house, and an LED module disposed inside the LED house. The LED module comprises a white light LED, a red light LED and a green light LED, and a light intensity ratio of the white light LED to the red light LED to the green light LED is (7-8) : (1.4-2) : 1. The LED lamp has increased CRI, and a relative higher lighting effect at a low color temperature as compared with a similar product. The LED lamp, however, have some disadvantages such as a relative greater thickness, an unaesthetic appearance, easy occurrence of glare, and lack of softness on light.

SUMMARY

Embodiments of the present disclosure seek to solve at least one of the problems.

According to a first aspect of the present disclosure, an LED module may be provided. The LED module includes: a lamp frame defining a first cavity which has an opening, a first side and a second side opposite to the first side； an LED light source disposed on the bottom of the first cavity and comprising at least a white light LED and a red light LED； a prism sealing the opening of the first cavity and comprising a light exiting surface and a light incident surface facing the LED light source； a reflecting plate disposed at a side of the prism adjacent to the light exiting surface； a brightness enhancement plate disposed above the reflecting plate and defining a sealed second cavity together with the prism and the reflecting plate； and a diffusing plate disposed above the brightness enhancement plate.

In some embodiments of the present disclosure, a first angle between the first side and a horizontal direction ranges from 10°to 60°, and a second angle between the second side and the horizontal direction ranges from 10°to 60°.

In some embodiments of the present disclosure, the light incident surface includes a flat plane, the light exiting surface comprises two inclined surfaces, and a third angle between the two inclined surfaces ranges from 80°to 140°.

In some embodiments of the present disclosure, the third angle between the two inclined surfaces ranges from 110°to 120°.

In some embodiments of the present disclosure, an amount ratio of the white light LED to the red light LED ranges from 1: 1 to 10: 1.

In some embodiments of the present disclosure, the amount ratio of the white light LED to the red light LED ranges from 2: 1 to 4: 1.

In some embodiments of the present disclosure, the white light LED and the red light LED are linearly arranged.

In some embodiments of the present disclosure, the white light LED and the red light LED are spaced apart from each other.

In some embodiments of the present disclosure, a distance L between the LED light source and the light incident surface and a distance P between two adjacent LED satisfy: 0.3≤L/P≤10.

In some embodiments of the present disclosure, the brightness enhancement plate comprises two orthogonally disposed brightness enhancement sheets.

In some embodiments of the present disclosure, a protrusion is disposed on a surface of the reflecting plate which faces the brightness enhancement plate.

In some embodiments of the present disclosure, the protrusion has a corrugated shape or a zigzag shape.

In some embodiments of the present disclosure, an axial cross section of the lamp frame has a substantial U shape.

According to a second aspect of the present disclosure, an LED lamp is provided. The LED lamp includes a lamp house, and the above described LED module disposed inside the lamp house.

In some embodiments of the present disclosure, the LED module may be disposed at one side of the reflecting plate, such that a thickness of the LED module may be reduced. The LED light source includes at least a white light LED and a red light LED disposed inside the lamp frame and the red light LED contains complementary red spectra, so that the CRI may be relatively higher. In the meantime, lights are emitted from the side, mixed, transmitted through the prism, the reflecting plate, the brightness enhancement plate and the diffusing plate, and then emitted from a light exiting surface of the diffusing plate. With an atomization effect of the diffusing plate, light emitted from the diffusing plate may be soft and uniform, thus avoiding the generation of glare. As compared with an LED module in the prior art, the LED module according to embodiments of the present disclosure may have a relatively higher CRI with a relative lower cost. In addition, the LED lamp according to embodiments of the present disclosure may have a relatively smaller weight and an enhanced optic utilization.

Additional aspects and advantages of embodiments of present disclosure will be given in part in the following descriptions, become apparent in part from the following descriptions, or be learned from the practice of the embodiments of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other aspects and advantages of embodiments of the present disclosure will become apparent and more readily appreciated from the following descriptions made with reference to the drawings, in which:

Fig. 1 is a schematic view of an LED module according to an embodiment of the present disclosure；

Fig. 2 is a schematic view of a lamp frame of an LED module according to an embodiment of the present disclosure；

Fig. 3 is a schematic view of a prism of an LED module according to an embodiment of the present disclosure；

Fig. 4 is a schematic view of an LED module according to an embodiment of the present disclosure；

Fig. 5 is a schematic view of a reflecting plate of an LED module according to an embodiment of the present disclosure； and

Fig. 6 is a schematic view of a reflecting plate of an LED module according to another embodiment of the present disclosure.

DETAILED DESCRIPTION

Reference will be made in detail to embodiments of the present disclosure. The embodiments described herein with reference to drawings are explanatory, illustrative, and used to generally understand the present disclosure. The embodiments shall not be construed to limit the present disclosure. The same or similar elements and the elements having same or similar functions are denoted by like reference numerals throughout the descriptions.

It is to be understood that phraseology and terminology used herein with reference to device or element orientation (such as, terms like “longitudinal” , “lateral” , “up” , “down” , “front” , “rear” , “left” , “right” , “vertical” , “horizontal” , “top” , “bottom” , “inside” , “outside” ) are only used to simplify description of the present disclosure, and do not indicate or imply that the device or element referred to must have or operated in a particular orientation. They cannot be seen as limits to the present disclosure.

In the description, terms such as “first” and “second” are used herein for purposes of description and are not intended to indicate or imply relative importance or significance. In addition, for the purpose of the present description and of the following claims, the definitions of the numerical ranges always include the extremes unless otherwise specified.

The LED module according to embodiments of the present disclosure will be described with reference to the drawings below.

As shown in Fig. 1, an LED module according to one embodiment of the present disclosure includes an LED light source 1, a lamp frame 2, a prism 3, a reflecting plate 4, a brightness enhancement plate 5, and a diffusing plate 6.

In some embodiment, the lamp frame 2 defines a first cavity in the interior thereof. The first cavity has an opening 21, and defines a first side and a second side opposite to each other. The LED light source 1 is disposed on the bottom of the first cavity and includes at least a white light LED and a red light LED. The prism 3 is disposed to seal the opening of the first cavity and includes a light exiting surface and a light incident surface facing the LED light source 1. The reflecting plate 4 is disposed at a side of the prism 3 adjacent to the light exiting surface. The brightness enhancement plate 5 is disposed above the reflecting plate 4 and defines a sealed second cavity together with the prism 3 and the reflecting plate 4. The diffusing plate 6 is disposed above the brightness enhancement plate 5.

In some embodiment, the lamp frame 2 defines a first cavity with an opening 21, and the first cavity defines a first side and a second side opposite to each other. The lamp frame 2 may be disposed at one side of the reflecting plate 4, and the opening 21 of the lamp frame 2 may face to one side of the reflecting plate 4； the LED source 1 may be disposed inside and on the bottom of the lamp frame 2, and the LED light source 1 includes at least a red light LED and a white light LED； the prism 3 may be disposed between the lamp frame 2 and the reflecting plate 4； the prism 3 and the lamp frame 2 are sealed to form a sealed first cavity； the brightness enhancement plate 5 may be disposed above the reflecting plate 4； the prism 3, the brightness enhancement plate 5 and the reflecting plate 4 define a sealed second cavity； and the diffusing plate 6 may be disposed above the brightness enhancement plate 5.

As shown in Fig. 2, in one embodiment of the present disclosure, the lamp frame 2 includes a vertically placed bottom 22, afirst side 23 extending upwardly from an upper end of the bottom of the lamp frame 2, and a second side 24 extending downwardly from a lower end of the bottom of the lamp frame2. A first angle α1 between the first side 23 and a horizontal direction ranges from 10°to 60°, and a second angle α2 between the second side 24 and the horizontal direction ranges from 10°to 60°. The α1 and α1 may be same with or different from each other. With the lamp frame as described, light path with a large angle may be controlled, and thus the light may be transmitted via the lamp frame and refracted to the reflecting plate by the prism as much as possible.

As shown in Fig. 3, in one embodiment of the present disclosure, the prism 3 includes a light exiting surface 32 and a light incident surface 31 facing the LED light source 1. The light incident surface 31 may include a flat plane, and the light exiting surface 32 may include or consists of two inclined surfaces 321. Athird angle β between the two inclined surfaces 321 ranges from 80°to 140°. In some embodiments of the present disclosure, the third angle β between the two inclined surfaces 321 ranges from 110°to 120°. If the third angle β is too large, the light with a large angle from the LED light source may be emitted from two sides directly, thus causing a uniform exited light. With third angle β according to the present disclosure, the direction of the light being transmitted or to be emitted, so that the light emitted from the light exiting surface of the prism is transmitted to the reflecting plate, reflected to the brightness enhancement plate via the reflecting plate, and then emitted. Those with ordinary skill in the art will appreciate that, different materials have different refractive indexes, so the third angle β may vary based on the material of the prism and a person skilled in the art may select proper third angle β accordingly.

In one embodiment of the present disclosure, a ratio between the number of the white light LED and the number of the red light LED ranges from 1: 1 to 10: 1, alternatively 2: 1 to 4: 1. The larger the ratio is, the higher the lighting effect will be. Decrease of this ratio may increase the CRI and provide a warm color, but decrease the lighting effect. With the ratio described above, the CRI, the lighting effect and the color temperature of the LED module may be balanced. In some embodiment, the white light LED may use blue light irradiated yellow fluorescent substances or blue light irradiated yellow fluorescent substances having red light nitrides.

As shown in Fig. 4, the white light LEDs (W) and the red light LEDs (R) are arranged linearly, for example, form at least one strip structure. In some embodiments, the white light LEDs (W)and the red light LEDs (R) are spaced apart from each other, as shown in Fig. 4. The white light LEDs (W) and the red light LEDs (R) are arranged linearly, so that the lights emitted thereby may be mixed more easily. The interval arrangement of the white light LED (W) and the red light LED(R) may further facilitate to mix the emitted lights. The number of the light source may be based on practical requirements, without particular limits in the present disclosure. Considering the number of light sources and the size of the LED module, the white light LEDs (W) and the red light LEDs (R) may be arranged into three lines, for example, form three light strips, provided these lines or strips are symmetrical about the center of the prism 3.

As shown in Fig. 1 and Fig. 4, in one embodiment of the present disclosure, a distance between the LED light source 1 and the light incident surface 21 may be defined as L, a distance between two adjacent LEDs may be defined as P, and L and P satisfy: 0.3≤L/P≤10. A dark area may be generated if a difference between the L and P is too large. The minimum of L/P (for example, 0.3) may depend on a fact that lights emitted from adjacent LEDs with different colors may communicate with each other at least at the light coupling edge, and the maximum of L/P (for example, 10) may depend on a fact that a too large width of the edge of the LED module may be hard to realize.

As shown in Fig. 1, in one embodiment of the present disclosure, the brightness enhancement plate 5 includes two orthogonal disposed brightness enhancement sheets. With the two orthogonal disposed brightness enhancement sheets, the luminance of emitted light may be increased by 100％.

As shown in Fig. 5 and Fig. 6, in some embodiments of the present disclosure,a protrusion is disposed on a surface of the reflecting plate facing the brightness enhancement plate 5. In some embodiments of the present disclosure, the protrusion has a corrugated shape or a zigzag shape.

Embodiments of the present disclosure further provide an LED lamp. The LED lamp includes a lamp house, and the above described LED module disposed inside the lamp house.

In some embodiments of the present disclosure, the lights (having angle of divergence, for example, 120°) emitted from the LED light source may be mixed in the sealed first cavity, and refracted by the prism, and emitted from the light emitting surface of the prism, with most emitted lights are emitted in substantial parallel beams. In this way, the original angle of divergence may be greatly reduced. Then the emitted light is transmitted to the second chamber, total refracted in the sealed second cavity, and then mixed. Once the light is transmitted to the protrusion on the reflecting plate, the light may be emitted from the light exiting surface of the reflecting plate.

In some embodiments of the present disclosure, the LED light source is disposed at the side (instead of above or below the LED module) , the lights may be mixed the first cavity and the second cavity, and reflected by the reflecting plate having the protrusion thereon, and then emitted upwardly. As compared with a conventional straight down LED module, the thickness of the LED module may be reduced significantly. In addition, the emitted light source is much softer and comfortable, because the lights are emitted from the diffusing plate instead of the light exiting surface of the LED. As compared with a lateral lamp in the prior art, a light guide plate is avoided, and therefore both the cost and weight of the lamp are reduced, and the CRI of the lamp is increased.

Reference throughout this specification to “an embodiment, ” “some embodiments, ” “one embodiment” , “another example, ” “an example, ” “a specific example, ” or “some examples, ” means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. Thus, the appearances of the phrases such as “in some embodiments, ” “in one embodiment” , “in an embodiment” , “in another example, ” “in an example, ” “in a specific example, ” or “in some examples, ” in various places throughout this specification are not necessarily referring to the same embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

Although explanatory embodiments have been shown and described, it would be appreciated by those skilled in the art that the above embodiments cannot be construed to limit the present disclosure, and changes, alternatives, and modifications can be made in the embodiments without departing from spirit, principles and scope of the present disclosure.

Claims

An LED module, comprising:

a lamp frame defining a first cavity which has an opening, a first side, and a second side opposite to the first side；

an LED light source disposed on the bottom of the first cavity and comprising at least a white light LED and a red light LED；

a prism disposed to seal the opening of the first cavity and comprising a light exiting surface and a light incident surface facing the LED light source；

a reflecting plate disposed at a side of the prism adjacent to the light exiting surface；

a brightness enhancement plate disposed above the reflecting plate and defining a sealed second cavity together with the prism and the reflecting plate； and

a diffusing plate disposed above the brightness enhancement plate.
The LED module of claim 1, wherein a first angle between the first side and a horizontal direction ranges from 10°to 60°, and a second angle between the second side and the horizontal direction ranges from 10°to 60°.
The LED module of claims 1 or 2, wherein the light incident surface comprises a flat plane, the light exiting surface comprises two inclined surfaces, and a third angle between the two inclined surfaces ranges from 80°to 140°.
The LED module of claim 3, wherein the third angle between the two inclined surfaces ranges from 110°to 120°.
The LED module of any of claims 1-4, wherein an amount ratio of the white light LED to the red light LED ranges from 1: 1to 10: 1.
The LED module of claim 5, wherein the amount ratio of the white light LED to the red light LED ranges from 2: 1to 4: 1.
The LED module of any of claims 1-6, wherein the white light LED and the red light LED are linearly arranged.
The LED module of any of claims 1-7, wherein the white light LED and the red light LED are spaced apart from each other.
The LED module of claim 8, wherein a distance L between the LED light source and the light incident surface and a distance P between two adjacent LED satisfy: 0.3≤L/P≤10.
The LED module of any of claims 1-9, wherein the brightness enhancement plate comprises two orthogonally disposed brightness enhancement sheets.
The LED module of any of claims 1-10, wherein a protrusion is disposed on a surface of the reflecting plate which faces the brightness enhancement plate.
The LED module of claim 11, wherein the protrusion has a corrugated shape or a zigzag shape.
The LED module of any of claims 1-12, wherein an axial cross section of the lamp frame has a substantial U shape.
An LED lamp comprising:

a lamp house, and

an LED module disposed inside the lamp house, wherein the LED module comprises a LED module according to any of claims 1-13.