CN102157670A - light emitting device - Google Patents

Abstract

The present invention is a light-emitting device. The light-emitting device includes a carrier, a light-emitting diode element and a colored lens. The light-emitting diode element is disposed on the carrier and electrically connected to the carrier. The colored lens is disposed on the light-emitting diode element, and the color of the colored lens gradually changes in a direction away from the light-emitting diode element, wherein a light beam provided by the light-emitting diode element is transmitted to the colored lens and emitted from the light-emitting device.

Description

light emitting device

technical field

The present invention relates to a light emitting device, and in particular to a light emitting device with better optical performance.

Background technique

Light-emitting diode is a light-emitting element composed of semiconductor materials containing III-V elements, and light-emitting diodes have advantages such as long life, small size, high shock resistance, low heat generation and low power consumption, so they have been widely used Indicators or light sources in household and various equipment. In recent years, light-emitting diodes have developed towards multi-color and high brightness, so their application fields have been extended to large outdoor signage, traffic lights and related fields. In the future, light-emitting diodes may even become the main lighting source with both power saving and environmental protection functions.

For example, most of the current packaging methods for high-power white light-emitting diodes are blue light-emitting diodes combined with yellow phosphor powder. In terms of performance, it has not really met the needs of lighting. In addition, white light-emitting diodes that use blue light-emitting diodes and yellow phosphor powder often have a circle of yellow light around the periphery of the emitted white light due to uneven distribution of yellow phosphor powder on the chip during the manufacturing process. This phenomenon is usually called "yellow light". faint".

Therefore, in the past, in order to solve the problem of yellow halo, a whitening agent was usually added to the phosphor to reduce the occurrence of yellow halo. The whitening agent is, for example, white particles or glass particles, which can scatter the light beam of the LED to reduce the yellow halo. degree. In contrast, the addition of whitening agents often sacrifices the overall light extraction efficiency of the LED, and cannot produce any improvement in the performance of color rendering.

Contents of the invention

The object of the present invention is to provide a light emitting device which can exhibit better optical performance.

The invention provides a light emitting device, which includes a carrier, a light emitting diode element and a colored lens. The LED element is disposed on the carrier and electrically connected to the carrier. The colored lens is arranged on the LED element, and the color of the colored lens changes gradually along the direction away from the LED element, wherein a light beam provided by the LED element passes to the colored lens and exits the light emitting device.

In an embodiment of the present invention, when the above-mentioned light emitting diode element is a blue light emitting diode chip, the light emitting device further includes a yellow phosphorescent material disposed between the colored lens and the light emitting diode element.

In an embodiment of the present invention, the above-mentioned light-emitting device further includes an encapsulant covering the light-emitting diode element, and the yellow phosphorescent material is doped in the encapsulant.

In an embodiment of the invention, the carrier is a printed circuit board.

The present invention further provides a light-emitting device, which includes a carrier, a casing, a light-emitting diode chip, a packaging colloid, and a colored lens. The casing is configured on the carrier and has an accommodating space to expose the carrier. The light emitting diode chip is located in the accommodation space and arranged on the carrier, and the light emitting diode chip is electrically connected to the carrier. The encapsulation colloid is configured on the LED chip and doped with a phosphorescent material. The colored lens is arranged on the light-emitting diode chip and bears against the carrier, and the color of the colored lens changes gradually along the direction away from the light-emitting diode chip. A beam of light provided by the LED chip passes through the phosphorescent material and is transmitted to the colored lens and exits the light emitting device.

In an embodiment of the present invention, the above-mentioned colored lens is doped with a dye to form a plurality of colored layers, and the above-mentioned colored layers are sequentially arranged and gradually changed in a direction away from the LED element/chip. In an embodiment of the present invention, when the above-mentioned dye is a blue dye, the colors of the above-mentioned colored layers gradually become lighter in a direction away from the LED element/chip. In an embodiment of the present invention, when the above-mentioned dye is a red dye, the colors of the above-mentioned colored layers gradually become darker along the direction away from the LED element/chip.

In an embodiment of the present invention, the color on the surface of the above-mentioned colored lens changes gradually along the direction away from the LED element/chip. In an embodiment of the present invention, a dye is arranged on the surface of the colored lens to form the color on the surface of the colored lens. In an embodiment of the present invention, when the color on the surface of the above-mentioned colored lens is blue, the color on the surface of the colored lens gradually becomes lighter in a direction away from the LED element/chip. In an embodiment of the present invention, when the color on the surface of the colored lens is red, the color on the surface of the colored lens gradually becomes darker along the direction away from the LED element/chip.

In an embodiment of the present invention, when the LED chip is a blue LED chip, the phosphorescent material is a yellow phosphorescent material.

Based on the above, the light-emitting device of the present invention can improve the optical performance of the light-emitting device by designing the color depth (chromaticity) of the colored lens to gradually change as it moves away from the light-emitting diode element. Wherein, when the dye dyed on the colored lens is blue and its color depth (chromaticity) gradually becomes lighter as it moves away from the light-emitting diode element, the occurrence of yellow halo phenomenon can be reduced without affecting its overall Luminous efficiency. In addition, when the dye dyed on the colored lens is red and its color depth (chromaticity) gradually becomes darker as it moves away from the light-emitting diode element, in addition to effectively reducing the occurrence of the yellow halo phenomenon, it can also The light-emitting device can have better color rendering when it is applied to lighting. In addition, the color depth of the colored lens can be expressed not only inside the lens, but also on the surface of the lens.

Description of drawings

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic diagram of a light emitting device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing the change of the color temperature of the light field of the light emitting device under different angles.

Fig. 3 is a schematic diagram of another embodiment of the light emitting device in one embodiment of the present invention.

FIG. 4 is a schematic diagram of a light emitting device according to another embodiment of the present invention.

FIG. 5 is a schematic diagram showing the change of the color temperature of the light field of the light emitting device under different angles.

Fig. 6 is a schematic diagram of yet another embodiment of a light emitting device in another embodiment of the present invention.

Detailed ways

FIG. 1 is a schematic diagram of a light emitting device according to an embodiment of the present invention. Please refer to FIG. 1 , the light emitting device 100 of this embodiment includes a carrier 110 , a light emitting diode element 120 and a colored lens 130 . The LED element 120 is disposed on the carrier 110 and electrically connected to the carrier 110 . In this embodiment, the carrier 110 is, for example, a printed circuit board or other substrates properly configured with a plurality of circuit lines. In addition, the light emitting diode element 120 is, for example, a white light emitting diode package, and its packaging method may be formed by using a blue light emitting diode chip 122 with a yellow phosphorescent material 124 , but is not limited thereto. In one embodiment, the LED element 120 can also be an LED chip of other colors and matched with appropriate phosphor or phosphor, so that the LED element 120 can provide white light or light of other colors. The light emitting diode element 120 of the present embodiment is an example in which the blue light emitting diode chip 122 is used together with the yellow phosphorescent material 124 , and the description is as follows.

In this embodiment, the light emitting device 100 may include an encapsulant 140 disposed on and covered with the LED element 120 , and the yellow phosphorescent material 124 is doped in the encapsulant 140 , as shown in FIG. 1 . Generally speaking, the process of disposing the encapsulant 140 doped with the yellow phosphorescent material 124 on the LED element 120 is usually a dispensing process. However, adopting this method will cause uneven distribution of phosphor powder or phosphor powder on the blue LED chip 122, thus causing the color temperature of the peripheral color light of a light beam L1 provided by the LED element 120 to be higher than that of the central color light, as shown in FIG. 2 shows the curve 102, wherein FIG. 2 is a schematic diagram showing the change of the color temperature of the light field of the light-emitting device at different angles, and the horizontal axis defines the angle of facing the light-emitting diode element as 0 degree. In this way, the so-called yellow halo phenomenon will occur when the light emitting device 100 provides illumination, thereby reducing the optical performance of the light emitting device 100 .

Therefore, in order to solve the above-mentioned problems, in the light emitting device 100 of this embodiment, the colored lens 130 is arranged on the LED element 120, and the color of the colored lens 130 will gradually change as it moves away from the LED element 120. Change, wherein the light beam L1 provided by the LED element 120 is transmitted to the colored lens 130 and exits the light emitting device 100 . In this embodiment, when the LED element 120 uses the above-mentioned blue light-emitting diode chip 122 and is used together with the above-mentioned yellow phosphorescent material 124, the colored lens 130 is doped with a dye (not shown) in the colored lens 130, for example. A plurality of colored layers 132 are formed, and the colored layers 132 are sequentially arranged and gradually changed in a direction away from the LED element 120 . In detail, if the above-mentioned dye is a blue organic dye, the colors of the above-mentioned color layers 132 will gradually become lighter along the direction away from the LED element 120 , as shown in FIG. 1 . In this embodiment, if the light emitting device 100 adopts the above-mentioned colored lens 130 , the light field and color temperature distribution of the light emitting device 100 at different angles will be as shown by the curve 104 in FIG. 2 .

It can be seen from FIG. 2 that if the light-emitting device 100 only uses a general lens, the color temperature of the peripheral light field of the light beam L1 provided by it will be higher than that of the central light field, and there will be the aforementioned yellow halo phenomenon, which means Generally, traditional optical lenses cannot improve the aforementioned yellow halo phenomenon. Conversely, when the light-emitting device 100 adopts the colored lens 130 as described above and shown in FIG. The color temperature difference between the peripheral light field and the central light field will be significantly reduced. In other words, the above-mentioned yellow halo phenomenon will be improved by the colored lens 130 of this embodiment so that the light emitting device 100 can exhibit better optical performance.

It should be noted that FIG. 1 is only a schematic diagram showing the colored lens 130. In other embodiments, the colors in the colored lens 130 may be different from the color depth of the multi-layer colored layer 132 along the direction away from the light-emitting diode element 120. In addition to gradually fading, it may also gradually fade away from the light emitting diode element 120 in a blurred manner. In other words, the aforementioned expression of the colors in the colored lens 130 in the manner of the multi-color layer 132 is only an embodiment, and is not limited thereto. All possible implementations in which the color depth (chromaticity) in the colored lens 130 changes gradually along the direction away from the LED element 120 are within the scope of protection of the present invention.

In addition, the above-mentioned color gradient of the colored lens 130 is achieved by doping dyes in the lens so that the technical feature of the color gradient is formed inside the colored lens 130 . In another embodiment, dyes can also be doped on the surface of the lens to form another colored lens 130 a, such as the light emitting device 100 a shown in FIG. 3 .

In the light emitting device 100 a , the color on the surface of the colored lens 130 a gradually changes as it moves away from the LED element 120 . In detail, dyes may be disposed on the surface of the colored lens 130a to form colors on the surface of the colored lens 130a. Similarly, if blue organic dye 132a is used as the dye, the color depth (chromaticity) on the surface of colored lens 130a gradually becomes lighter along the direction away from LED element 120, as shown in FIG. 3 . In this way, the colored lens 130a can also reduce the above-mentioned yellow halo phenomenon of the light emitting device 100a, so that the light emitting device 100a has better optical performance.

In addition, FIG. 4 is a schematic diagram of a light emitting device according to another embodiment of the present invention. Please refer to FIG. 1 and FIG. 4 at the same time. The structure of the light emitting device 200 is similar to that of the light emitting device 100, but the difference is that the color gradient of the colored lens 230 in the light emitting device 200 gradually changes as it moves away from the light emitting diode element 220. Deep, as shown in Figure 4. For example, when the dye doped in the colored lens 230 is a red organic dye, the color depth (chromaticity) of the plurality of colored layers 232 formed in the colored lens 230 will move away from the light emitting diode element 220. gradually become darker. At this time, after the light emitting device 200 adopts the colored lens 230 , its light field and color temperature distribution at different angles will be as shown by the curve 202 in FIG. 5 .

Similarly, in FIG. 5, if the light emitting device 200 only uses a general lens, the color temperature of the peripheral light field of the light beam L1 provided by it will be higher than that of the central light field, as shown by the curve 102 in FIG. 5, And there will be the aforementioned yellow halo phenomenon, which means that the general traditional optical lens cannot improve the aforementioned yellow halo phenomenon. Conversely, when the light emitting device 200 adopts the colored lens 230 as described above and shown in FIG. The color temperature difference between the peripheral light field and the central light field will be significantly reduced. In this way, in addition to solving the yellow halo phenomenon, it can also compensate for the insufficient wavelength band of the light emitting device 200 in the CIE (Commission International de l'Eclairage) chromaticity diagram, thereby improving the color rendering index (CRI) of the light emitting device 200 , performance on CRI).

Similarly, FIG. 4 is only a schematic diagram showing the colored lens 230. In other embodiments, the color in the colored lens 230 may be different from the color depth of the multi-layer colored layer 232 along the direction away from the LED element 220. In addition to becoming darker, it may also gradually become darker in a direction away from the LED element 220 in a blurred manner. In other words, the aforementioned expression of the colors in the colored lens 230 by means of the multi-color layer 232 is only an embodiment, and is not limited thereto. All possible implementations in which the color depth (chromaticity) in the colored lens 230 changes gradually along the direction away from the LED element 220 are within the scope of protection of the present invention.

In addition, the above-mentioned color gradient of the colored lens 230 is achieved by doping dyes in the lens so that the technical feature of the color gradient is formed inside the colored lens 230 . In another embodiment, dyes can also be doped on the surface of the lens to form another colored lens 230 a, such as the light emitting device 200 a shown in FIG. 6 .

In the light emitting device 200 a , the color on the surface of the colored lens 230 a gradually changes as it moves away from the LED element 220 . In detail, dyes may be disposed on the surface of the colored lens 230a to form colors on the surface of the colored lens 230a. Similarly, if the red organic dye 232a is used, the color depth (chromaticity) on the surface of the colored lens 230a gradually becomes darker along the direction away from the LED element 220 , as shown in FIG. 6 . In this way, the colored lens 230a not only can reduce the above-mentioned yellow halo phenomenon of the light emitting device 200a, but also can make the light emitting device 200a have high color rendering (CRI), so that the light emitting device 200a has better optical performance.

It should be noted that the above-mentioned light-emitting devices 100, 100a, 200, 200a may further include a casing 160 respectively disposed on the carrier 110, 210, and the casing 160 has an accommodating space S1 to expose the carrier 110 , 210, as shown in Fig. 1 , Fig. 3 , Fig. 4 and Fig. 6 . In addition, the aforementioned LED elements 120 , 220 are located in the accommodating space S1 and disposed on the carrier 110 , 210 . The above-mentioned colored lenses 130 , 130 a , 230 , 230 a are respectively disposed on the light emitting diode elements 120 , 220 and respectively supported on the carrier 110 , 210 .

To sum up, the light emitting device of the present invention has at least the following advantages. Firstly, the optical performance of the light-emitting device can be improved by disposing the colored lens on the LED element, and the color depth (chromaticity) of the colored lens gradually changes as it moves away from the LED element. In addition, when the dye dyed in the colored lens is blue and its color depth (chromaticity) gradually becomes lighter as it moves away from the LED element, it can still be effective without affecting its overall luminous efficiency. Reduce the occurrence of yellow halo phenomenon. Furthermore, when the dye dyed in the colored lens is red and its color depth (chromaticity) gradually becomes darker as it moves away from the light-emitting diode element, it can still be effective except that it does not affect its overall luminous efficiency. In addition to reducing the occurrence of the yellow halo phenomenon, it can also make the light emitting device have better color rendering. In addition, the color depth of the colored lens can be expressed not only inside the lens, but also on the surface of the lens.

Although the present invention has been disclosed above with embodiments, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field may make various equivalent changes or substitutions without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the appended claims of the application.

Claims (20)

1. a light-emitting device is characterized in that, comprising:

One carrier;

One light-emitting diode is disposed on this carrier, and is electrically connected to this carrier; And

One colored lens, be disposed on this light-emitting diode, and the color of this colored lens is along with toward away from changing gradually on the direction of this light-emitting diode, and the light beam that wherein this light-emitting diode provided can be passed to this colored lens and outgoing in this light-emitting device.

2. light-emitting device according to claim 1 is characterized in that, be doped with a dyestuff in this colored lens and form a plurality of chromatographs, and those chromatographs is toward away from ordering in regular turn on the direction of this light-emitting diode and change gradually.

3. light-emitting device according to claim 2 is characterized in that, when this dyestuff was a blue dyes, then the color of those chromatographs was with away from thin out gradually on the direction of this light-emitting diode.

4. light-emitting device according to claim 2 is characterized in that, when this dyestuff was an orchil, then the color of those chromatographs was with deepening gradually on the direction away from this light-emitting diode.

5. light-emitting device according to claim 1 is characterized in that, the lip-deep color of this colored lens is along with toward away from changing gradually on the direction of this light-emitting diode.

6. light-emitting device according to claim 5 is characterized in that, disposes a dyestuff on this colored lens surface to form the lip-deep color of this colored lens.

7. light-emitting device according to claim 5 is characterized in that, when the lip-deep color of this colored lens was blue, then the lip-deep color of this colored lens was with away from thin out gradually on the direction of this light-emitting diode.

8. light-emitting device according to claim 5 is characterized in that, when the lip-deep color of this colored lens was red, then the lip-deep color of this colored lens was with deepening gradually on the direction away from this light-emitting diode.

9. light-emitting device according to claim 1 is characterized in that, when this light-emitting diode was a blue LED chip, this light-emitting device also comprised a yellow phosphorescence material, was disposed between this colored lens and this light-emitting diode.

10. light-emitting device according to claim 9 is characterized in that, also comprises a packing colloid, be covered on this light-emitting diode, and this yellow phosphorescence is material doped in this packing colloid.

11. light-emitting device according to claim 1 is characterized in that, this carrier is a printed circuit board (PCB).

12. a light-emitting device is characterized in that, comprising:

One carrier;

One housing is disposed on this carrier and has an accommodation space to expose this carrier;

One light-emitting diode chip for backlight unit is positioned at this accommodation space and is disposed on this carrier, and this light-emitting diode chip for backlight unit is electrically connected to this carrier;

One packing colloid is disposed on this light-emitting diode chip for backlight unit and is doped with a phosphor material; And

One colored lens, be disposed on this light-emitting diode chip for backlight unit and this carrier of breasting, and the color of this colored lens is along with toward away from changing gradually on the direction of this light-emitting diode chip for backlight unit, and the light beam that wherein this light-emitting diode chip for backlight unit provided can be passed to this colored lens and outgoing in this light-emitting device by this phosphor material.

13. light-emitting device according to claim 12 is characterized in that, be doped with a dyestuff in this colored lens and form a plurality of chromatographs, and those chromatographs is toward away from ordering in regular turn on the direction of this light-emitting diode chip for backlight unit and change gradually.

14. light-emitting device according to claim 13 is characterized in that, when this dyestuff was a blue dyes, then the color of those chromatographs was with away from thin out gradually on the direction of this light-emitting diode chip for backlight unit.

15. light-emitting device according to claim 13 is characterized in that, when this dyestuff was an orchil, then the color of those chromatographs was with deepening gradually on the direction away from this light-emitting diode chip for backlight unit.

16. light-emitting device according to claim 12 is characterized in that, the lip-deep color of this colored lens is along with toward away from changing gradually on the direction of this light-emitting diode chip for backlight unit.

17. light-emitting device according to claim 16 is characterized in that, disposes a dyestuff on this colored lens surface to form the lip-deep color of this colored lens.

18. light-emitting device according to claim 16 is characterized in that, when the lip-deep color of this colored lens was blue, then the lip-deep color of this colored lens was with away from thin out gradually on the direction of this light-emitting diode chip for backlight unit.

19. light-emitting device according to claim 16 is characterized in that, when the lip-deep color of this colored lens was red, then the lip-deep color of this colored lens was with deepening gradually on the direction away from this light-emitting diode chip for backlight unit.

20. light-emitting device according to claim 12 is characterized in that, when this light-emitting diode chip for backlight unit was a blue LED chip, this phosphor material was a yellow phosphorescence material.

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