TWI599079B - Low blue light lighting device and light mixing method thereof - Google Patents

Description

Low blue light illumination device and light mixing method thereof

The present invention relates to an illumination device, and more particularly to a low blue illumination device that uses mixed light. The invention also relates to a method of mixing light of such a low blue illumination device.

White LEDs play an important role in energy saving and other various control applications. Therefore, the development of white LEDs is the main reason for the advancement of lighting technology in recent years. White LEDs are typically formed in two ways, the first being the use of blue light and fluorescent powder to form white light; the second is the mixing of three primary color LEDs to produce white light.

However, in the application of white LED illumination, if white light with high color temperature is to be generated, it is necessary to increase the proportion of radiant energy of low-wavelength blue light, and the center wavelength of the blue LED, that is, the wavelength with the highest radiant energy, usually falls on The 440-460nm band has been proven to be the main blue light hazard band, which has a great impact on human physiology.

At present, the LED radiation intensity test standard IEC62471 and the Republic of China national standard CNS15592 mainly use the blue light hazard weighting function B(λ) to evaluate the degree of blue light hazard. The weighting curve reaches the highest in the blue light band of 440-460nm, and also affects the light radiation. The degree of human physiology is positively correlated. However, usually the light of high color temperature contains more blue light components, so the higher the color temperature or the higher the light radiation energy, the greater the degree of influence on the human body.

Therefore, in order to reduce the blue light hazard, the intensity of the low-wavelength blue light is reduced, so that the proportion of the radiant energy of the long-wavelength light is increased, and the color of the composed white light is The preference for orange or red, that is, the color temperature of the composed white light will be reduced, thus changing the consistency of people's vision, and making people's attention not easy to concentrate. In other words, since the blue light hazard, the blue light ratio, and the color temperature are highly positively correlated, the lighting device of the conventional art cannot take the color temperature of the white light under the premise of reducing the blue light hazard, so the performance cannot be effectively improved.

Moreover, due to the above limitations, the illumination device of the prior art cannot independently adjust various optical characteristics of the mixed light, such as light intensity, color temperature, blue light energy ratio, etc., and thus is also greatly limited in application.

Therefore, how to propose a lighting device, which can effectively improve the optical device of the prior art, has the disadvantages of high blue light hazard, high cost, and inability to independently adjust the optical characteristics of the mixed light, which has become an urgent problem.

In view of the above problems in the prior art, one of the objects of the present invention is to provide a low-blue light illumination device and a light mixing method thereof, which can solve the problem that the illumination device of the prior art has high blue light hazard and cannot independently adjust the mixed light. The problem of the shortcomings of optical properties.

According to one of the objects of the present invention, a low blue light illumination device is provided, which may include a first light source, a second light source, and a driving module. The first light source emits a first light, and the first light has a wavelength in the range of about 490 nm to 570 nm. The second light source can emit a second light, and the second light can be white light and has a color temperature range of about 1800K to 7500K. The driving module can be electrically connected to the first light source and the second light source. The driving module can respectively drive the first light source and the second light source to mix the first light and the second light into mixed light, and the mixed light can also be white light.

According to another aspect of the present invention, a low blue light mixing method is further provided, which may include the following steps: providing a first light source, the first light source emitting a first light, and the first light may have a wavelength ranging from about 490 nm to 570 nm; Providing a second light source, the second light source emitting a second light, the second light The color temperature range of the line may be about 1800K~7500K; and the first light source and the second light source are driven so that the first light can be mixed with the second light to be mixed light, and the mixed light can also be white light.

According to another aspect of the present invention, a low blue light illumination device is further provided, which may include a first light source, a second light source, and a driving module. The first light source emits a first light, and the first light has a wavelength in the range of about 380 nm to 410 nm. The second light source can emit a second light, and the second light can be white light and has a color temperature range of about 1800K to 7500K. The driving module can be electrically connected to the first light source and the second light source. The driving module can respectively drive the first light source and the second light source to mix the first light and the second light into mixed light, and the mixed light can also be white light.

1‧‧‧Low blue lighting

10‧‧‧Substrate

11‧‧‧First light source

12‧‧‧second light source

13‧‧‧Drive Module

14‧‧‧ Third light source

C6~C7, C11~C13, CB, CR‧‧‧ curves

P11~P13, E1~E5, EC‧‧‧ punctuation

S21~S24, S81~S85‧‧‧ Step procedure

Figure 1 is a schematic illustration of a first embodiment of a low blue light illumination device of the present invention.

Figure 2 is a flow chart of a first embodiment of the low blue light illumination device of the present invention.

Figure 3 is a first schematic view of a second embodiment of the low blue illumination device of the present invention.

Figure 4 is a second schematic view of a second embodiment of the low blue illumination device of the present invention.

Figure 5 is a third schematic view of a second embodiment of the low blue light illumination device of the present invention.

Figure 6 is a fourth schematic view of a second embodiment of the low blue illumination device of the present invention.

Figure 7 is a fifth schematic view of a second embodiment of the low blue illumination device of the present invention.

Figure 8 is a flow chart of a second embodiment of the low blue light illumination device of the present invention.

Figure 9 is a first schematic view of a third embodiment of the low blue light illumination device of the present invention.

Figure 10 is a second schematic view of a third embodiment of the low blue illumination device of the present invention.

The embodiments of the low-blue illumination device and the light-mixing method thereof according to the present invention will be described below with reference to the related drawings. For the sake of understanding, the same components in the following embodiments are denoted by the same reference numerals.

Please refer to FIG. 1 , which is a schematic diagram of a first embodiment of a low blue light illumination device of the present invention. Figure. As shown, the low blue illumination device 1 can include a substrate 10, a first light source 11, a second light source 12, and a drive module 13.

The first light source 11 and the second light source 12 may be disposed on the substrate 10. The first light source 11 can emit a first light, and the first light can be blue-green light, and the wavelength can range from about 490 nm to 570 nm. The second light source 12 can emit a second light, and the second light can be white light, and the color temperature can range from about 1800K to 7500K. The first light source 11 and the second light source 12 can be various light sources, such as a light emitting diode (LED) or the like. The driving module 13 can be electrically connected to the first light source 11 and the second light source 12, and can respectively drive the first light source 11 and the second light source 12 to mix the first light and the second light into a mixed light, wherein the mixed light It is also white light, and the color temperature of the mixed light can be higher than the second light.

In this embodiment, the low blue illumination device 1 can use a mixture of blue-green light having a wavelength range of about 490 nm to 570 nm and white light having a color temperature range of about 1800 K to 7500 K to generate a special mixed light, wherein the wavelength range is about 490 nm. The blue-green light of 570 nm and the blue light with a wavelength range of about 440-460 nm can produce similar visual effects, but the weight index of the blue-light hazard weighting function B(λ) of blue-green light with a wavelength range of about 490 nm to 570 nm is much lower than the wavelength. Blue light in the range of about 440-460 nm. Therefore, the mixed light generated by the low blue illumination device 1 of the present embodiment can be white light of high color temperature, but has a low blue component, so that damage to the human body can be greatly reduced.

In addition, the driving module 13 can adjust the driving currents for driving the first light source 11 and the second light source 12 to simultaneously change the color temperature and the blue light component of the mixed light, or change the brightness of the mixed light but the color temperature does not change.

In other embodiments, the first light may have a wavelength in the range of about 500 nm to 550 nm, or about 510 nm to 540 nm, and the second light may have a color temperature range of about 2700 K to 6500 K, or about 3000 K to 5700 K.

Please refer to FIG. 2, which is a flow chart of the first embodiment of the low blue light illumination device of the present invention. The low blue light mixing method of this embodiment may include the following steps:

In step S21, a first light source is provided, and the first light source emits a first light having a wavelength ranging from about 490 nm to 570 nm.

In step S22, a second light source is provided, and the second light source emits a second light having a color temperature range of about 1800K to 7500K.

In step S23, the first light source and the second light source are driven to mix the first light and the second light into a mixed light.

In step S24, at least one of a driving current of the first light source and/or a driving current of the second light source is adjusted to correct optical characteristics of the mixed light.

Please refer to FIG. 3, FIG. 4, FIG. 5, FIG. 6 and FIG. 7 , which are a first schematic diagram, a second schematic diagram and a third schematic diagram of a second embodiment of the low blue light illumination device of the present invention. The fourth schematic diagram and the fifth schematic diagram. As shown in FIG. 3, the low blue illumination device 1 may include a substrate 10, a first light source 11, a second light source 12, and a driving module 13. Unlike the foregoing embodiment, the low blue illumination device 1 may further include a third Light source 14.

The first light source 11 , the second light source 12 , and the third light source 14 may be disposed on the substrate 10 . The first light source 11 can emit a first light. The wavelength of the first light can range from about 490 nm to 570 nm. In one embodiment, the first light can have a wavelength of 500 nm to 550 nm, and in another embodiment, the wavelength can be 510 nm. 540nm. In the present embodiment, blue-green light having a wavelength of about 525 nm is used as the first light to exemplify. The second light source 12 can emit a second light, and the color temperature of the second light can range from about 1800K to 7500K. In one embodiment, the color temperature of the second light can be 2700K~6500K, and in another embodiment, 3000K. ~5700K. In the present embodiment, warm white light having a color temperature of 2700 K is exemplified as the second light. The third light source 14 can emit a third light, and the color temperature of the third light can range from about 1800K to 7500K. In an embodiment, the color temperature of the third light can be It is 2700K~6500K, and in another embodiment, it can also be 3000K~5700K. In the present embodiment, cold white light having a color temperature of 6500 K is exemplified as the third light.

The driving module 13 can be electrically connected to the first light source 11 , the second light source 12 , and the third light source 14 , and can respectively drive the first light source 11 , the second light source 12 , and the third light source 14 to make the first light and the second light The light and the third light are mixed into the mixed light. In addition, the driving module 13 can adjust the driving currents of the first light source 11, the second light source 12, and the third light source 14, respectively, so that the light intensity of the mixed light can be independently adjusted. Optical properties such as color temperature and blue light energy ratio. The color temperature of the third light may be higher than the mixed light, and the color temperature of the mixed light may be higher than the second light; in addition, the blue light energy ratio of the third light may be higher than the blue light energy ratio of the mixed light, and the blue light energy of the mixed light The ratio can be higher than the ratio of the blue light energy of the second light.

Figure 4 is a graph of optical radiation intensity illustrating the optical radiation intensity of the first, second and third rays. Wherein, the curve C11 represents the light radiation intensity curve of the first light, the curve C12 represents the light radiation intensity curve of the second light, and the curve C13 represents the light radiation intensity curve of the third light.

Figure 5 is a CIE1931 chromaticity coordinate map illustrating the color coordinates of the first, second, and third rays. Wherein, the coordinate point P11 represents the chromaticity coordinate of the first light, the coordinate point P12 represents the chromaticity coordinate of the second light, the coordinate point P13 represents the chromaticity coordinate of the third light, and the curve CB is the black body radiation curve. In order to demonstrate the efficiencies that can be achieved in this embodiment, in this embodiment, experiments are carried out using LED devices of well-known brands, including Lextar (model: PC30H08 V0), Cree (model: Cree® XLamp® MHB-A LEDs), and Osram. (Model: GW JCLMS1.EC), all of which are LED devices with a color temperature of 4000K.

In order to effectively compare the difference in blue light hazard of two different LED devices, this embodiment modifies the formula of the Chinese National Standards (CNS) standard to establish a calculation formula of B(λ) integral (B(λ)_score), but This formula only calculates the portion of the blue light band (400-500 nm). Since the illuminating stereo angle of the LED device is the same as the time, the embodiment does not calculate the illuminating solid angle and time of the LED device, and the calculation of the B(λ) integral in this embodiment The formula is as follows: Where W _λ represents the optical radiation energy of the wavelength of the LED device at λ; B(λ) represents the blue light hazard weighting function; Δλ represents the bandwidth (nm); X represents the luminous flux (lm) of the LED device; and B(λ) The final normalization calculation "10/X" of the integral calculation formula aims to eliminate the difference of optical radiation caused by the brightness error, so that the B(λ) integral calculation formula can effectively compare the blue light ratio of the LED devices of different brightness.

Table 1 is an experimental data table of the embodiment, which illustrates the color temperature and color rendering of the mixed light generated by the first light source 11, the second light source 12, and the third light source 14 by the driving module 13 of the embodiment. , B(λ) integral and ΔB(λ), where ΔB(λ) represents the B(λ) integral of the mixed light produced by the low blue illumination device 1 and the LED devices of the above three well-known brands are generated at a driving current of 20 mA. The difference between the average values of the B(λ) integrals, Table 1 further illustrates the experimental data of the LED device of the Lextar brand model PC30H08 V0 (4000K).

Figure 6 is a CIE1931 chromaticity coordinate diagram of the present embodiment, which illustrates the first group of Table 1. The chrominance coordinate map of the implementation data to the fifth set of implementation data. Wherein, the coordinate point E1 represents the chromaticity coordinate of the first group of implementation data, the coordinate point E2 represents the chromaticity coordinate of the second group of implementation data, the coordinate point E3 represents the chromaticity coordinate of the third group of implementation data, and the coordinate point E4 represents the fourth The group implements the chromaticity coordinates of the data. The coordinate point E5 indicates the chromaticity coordinate of the fifth group of implementation data, the center point of the white light with the coordinate point EC of 4000K, the curve CB is the black body radiation curve, and the range of the central parallelogram CR indicates the CIE. The color temperature is the standard range of white light of 4000K. As can be seen from Fig. 6, the experimental data of each group in Table 1 conforms to the white light standard with a CIE color temperature of 4000K.

As shown in Table 1, according to each set of experimental data, the first light source 11, the second light source 12, and the third light source 14 are respectively driven by the driving module 13 with different driving currents to make the mixed light generated by the low blue light illuminating device 1 When the color temperature is close to 4000K, the color rendering of the mixed light can reach 85 or more, so the performance in color rendering is excellent. In the part of ΔB(λ), the ΔB(λ) of each experimental data is about 20 Between % and 30%, that is to say, the blue light hazard of the mixed light generated by the low-blue illumination device 1 is only about 70% to 80% of the average value of the blue light hazard of the LED devices of the above three well-known brands. As can be seen from the above, the mixed light generated by the low blue illumination device 1 can achieve high color temperature, high color rendering, and can effectively reduce blue light hazard.

On the contrary, as shown in Table 1, the LED device of the Lextar brand model PC30H08 V0 (4000K) is driven by a driving current of 20 mA, its color temperature can be close to 4000K, and the color rendering is also excellent, but its ΔB(λ) value is low. , indicating that the degree of blue light hazard is significantly higher.

Figure 7 is a graph showing the optical radiation intensity of the present embodiment, wherein the curve C6 represents the optical radiation intensity curve of the sixth set of implementation data of Table 1, and the curve C7 represents the optical radiation intensity curve of the seventh set of implementation data of Table 1, The curve CL represents the optical radiation intensity curve of the experimental data of the LED device of the model Lextar brand model PC30H08 V0 (4000K). It can be clearly seen from Fig. 7 that the blue light illuminating device 1 of the present embodiment has a blue radiant intensity of 400 nm to 500 nm which is significantly lower than that of the Lextar brand model PC30H08 V0 (4000 K). The LED device is 400 nm to 500 nm blue. Light radiation intensity.

It is worth mentioning that the lighting device of the prior art cannot balance the color temperature of white light on the premise of reducing the blue light hazard, so the performance of the lighting device of the conventional art cannot be effectively improved. In contrast, in an embodiment of the present invention, the low blue illumination device can mix blue-green light having a specific wavelength range and white light having a specific color temperature range to generate mixed light, so that white light with low blue light hazard and high color temperature can be generated. At the same time, both the blue light hazard and the white light color temperature are reduced, so the performance of the low blue light illumination device can be greatly increased.

In addition, the lighting device of the prior art cannot independently adjust various optical characteristics of the mixed light, such as light intensity, color temperature, and blue light energy ratio, etc., so the application is greatly limited. In contrast, in one embodiment of the present invention, the low blue illumination device can mix blue-green light having a specific wavelength range, warm white light having a specific color temperature range, and cool white light having a specific color temperature range to generate mixed light, and thus can be independently adjusted. Adjusting the optical properties such as light intensity, color temperature and blue light energy ratio of mixed light makes the application of low blue light illumination devices more widely. As can be seen from the above, the present invention has progressive patent requirements.

Please refer to FIG. 8 , which is a flow chart of a second embodiment of the low blue light illumination device of the present invention. The low blue light mixing method of this embodiment may include the following steps:

In step S81, a first light source is provided, and the first light source emits a first light having a wavelength ranging from about 490 nm to 570 nm.

In step S82, a second light source is provided, and the second light source emits a second light having a color temperature ranging from about 1800K to 7500K.

In step S83, a third light source is provided, and the third light source emits a third light having a color temperature range of about 1800K~7500K.

In step S84, the first light source, the second light source, and the third light source are driven to mix the first light, the second light, and the third light into a mixed light.

In step S85, at least one of a driving current for driving the first light source, a driving current of the second light source, and a driving current of the third light source is adjusted to correct optical characteristics of the mixed light.

Please refer to FIG. 9 and FIG. 10 , which are a first schematic diagram and a second schematic diagram of a third embodiment of the low blue illumination device of the present invention. As shown in FIG. 9, the low blue illumination device 1 may include a substrate 10, a first light source 11, a second light source 12, a third light source 14, and a drive module 13.

The first light source 11 , the second light source 12 , and the third light source 14 may be disposed on the substrate 10 . The first light source 11 can emit a first light, and the first light can be deep blue or near-ultraviolet light, and the wavelength thereof can be about 380 nm to 410 nm. In the present embodiment, the deep blue light having a wavelength of 400 nm is used as an example. The second light source 12 can emit a second light, which in the present embodiment is exemplified by warm white light having a color temperature of 2700K. The third light source 14 can emit a third light, which is exemplified in the present embodiment by using cool white light having a color temperature of 6500K.

Different from the foregoing embodiments, in the present embodiment, the low blue illumination device 1 can use a deep blue or near ultraviolet light having a wavelength range of about 380 nm to 410 nm to mix with white light having a color temperature range of about 1800 K to 7500 K to generate a special Mixed light, in which deep blue or near-ultraviolet light with a wavelength range of about 380 nm to 410 nm and blue light with a wavelength range of about 440-460 nm can also produce similar visual effects, but the weight index of the blue light hazard weighting function B(λ) It is much lower than the blue light with a wavelength range of about 440-460 nm. Therefore, the mixed light generated by the low blue light illumination device 1 of the present embodiment can be white light of high color temperature, but has a low blue light component, so that the damage to the human body can be greatly reduced.

The driving module 13 can be electrically connected to the first light source 11 , the second light source 12 , and the third light source 14 , and can respectively drive the first light source 11 , the second light source 12 , and the third light source 14 to make the first light and the second light The light and the third light are mixed into a mixed light, wherein the color temperature of the third light may be greater than the color temperature of the mixed light, and the color temperature of the mixed light may be greater than the color temperature of the second light.

In order to effectively compare the difference in blue light hazard of two different LED devices, this embodiment is also The calculation formula of B(λ) integral (B(λ)_score) of the foregoing embodiment is utilized. Table 2 is an experimental data table of the embodiment, which illustrates the color temperature and color rendering of the mixed light generated by the first light source 11, the second light source 12, and the third light source 14 by the driving module 13 of the embodiment. , B(λ) integral and ΔB(λ), where ΔB(λ) represents the B(λ) integral of the mixed light produced by the low blue illumination device 1 and the LED devices of the above three well-known brands are generated at a driving current of 20 mA. The difference between the average values of the B(λ) integrals.

Figure 10 is a CIE 1931 chromaticity coordinate map illustrating the chromaticity coordinates of the first set of implementation data of Table 2 to the fourth set of implementation data. Wherein, the coordinate point E1 represents the chromaticity coordinate of the first group of implementation data, the coordinate point E2 represents the chromaticity coordinate of the second group of implementation data, the coordinate point E3 represents the chromaticity coordinate of the third group of implementation data, and the coordinate point E4 represents the fourth The group implements the chromaticity coordinates of the data, the coordinate point EC is the center point of the white light of 4000K, the curve CB is the black body radiation curve, and the range of the central parallelogram CR represents the standard range of the white light with a CIE color temperature of 4000K. As can be seen from Fig. 10, the experimental data of each group of Table 2 are in compliance with the white light standard of CIE color temperature of 4000K.

As shown in Table 2, the first light source 11, the second light source 12, and the third light source 14 are respectively driven by the driving module 13 with different driving currents, so that the color temperature of the mixed light generated by the low blue light illumination device 1 of the present embodiment is close to In the case of 4000K, the color rendering of mixed light can reach about 85, so the performance in color rendering is excellent, but the ΔB(λ) value of the low blue illumination device 1 of this embodiment is about 5%~10%. In other words, the blue light hazard of the mixed light produced by the low-blue illumination device 1 is only about 90% to 95% of the average value of the blue light hazard of the LED devices of the above three well-known brands. This can also reduce the blue light hazard to a certain extent.

In summary, the low blue light illumination device and the light mixing method thereof according to the present invention may have one or more of the following advantages:

(1) In an embodiment of the present invention, the low blue illumination device can mix blue-green light having a specific wavelength range or near-ultraviolet light and white light having a specific color temperature range to generate mixed light, thereby generating a low blue light hazard and having The high color temperature of white light, while taking into account the need to reduce the blue light hazard and white light color temperature, so that people's comfort and attention increase, so the performance of low blue light lighting device can be greatly increased.

(2) In one embodiment of the present invention, blue-green light having a specific wavelength range, warm white light having a specific color temperature range, and cool white light having a specific color temperature range may be mixed to generate mixed light, so that the mixed light may be independently adjusted and adjusted. Optical properties such as light intensity, color temperature, and blue light energy ratio make the application of low-blue illumination devices more widely.

It can be seen that the present invention has achieved the desired effect under the prior art, and is not familiar with the skill of the artist, and its progressiveness and practicability have been met with the patent application requirements.提出 Submit a patent application in accordance with the law, and ask your bureau to approve the application for this invention patent, in order to encourage creation, to the sense of virtue.

The above is intended to be illustrative only and not limiting. Any other equivalent modifications or alterations of the present invention are intended to be included in the scope of the appended claims.

1‧‧‧Low blue lighting

10‧‧‧Substrate

11‧‧‧First light source

12‧‧‧second light source

13‧‧‧Drive Module

Claims (27)

A low-blue illumination device includes: a first light source emitting a first light having a wavelength ranging from 490 nm to 570 nm; and a second light source emitting a second light, the second light For the white light, the color temperature ranges from 1800K to 7500K; a driving module is electrically connected to the first light source and the second light source; wherein the driving module respectively drives the first light source and the second light source, so that The first light is mixed with the second light into a mixed light, and the mixed light is also white light. The low blue illumination device of claim 1, wherein the first light has a wavelength in the range of 500 nm to 550 nm. The low blue light illumination device of claim 1, wherein the first light has a wavelength ranging from 510 nm to 540 nm. The low blue light illumination device of claim 1, wherein the second light has a color temperature ranging from 2700K to 6500K. The low blue light illumination device of claim 1, wherein the second light has a color temperature ranging from 3000K to 5700K. The low blue light illumination device of claim 1, wherein the color temperature of the mixed light is higher than the color temperature of the second light. The low blue light illumination device of claim 1, further comprising a third light source, wherein the color temperature of the third light is in the range of 1800K to 7500K, and the driving module respectively drives the first light source and the second light source. The third light source mixes the first light, the second light, and the third light into the mixed light. The low blue light illumination device of claim 7, wherein the first light source, the The second light source and the third light source are light emitting diodes. The low blue light illumination device of claim 8, wherein the second light system is a warm white light, and the third light is a cool white light. The low blue light illumination device of claim 8, wherein the color temperature of the third light is higher than the color temperature of the mixed light, and the color temperature of the mixed light is higher than the color temperature of the second light. The low blue light illumination device of claim 10, wherein the third light has a blue light energy ratio higher than a blue light energy ratio of the mixed light, and the mixed light has a blue light energy ratio higher than the second light. The proportion of blue light energy. A low blue light mixing method comprises the steps of: providing a first light source, the first light source emitting a first light, the first light having a wavelength ranging from 490 nm to 570 nm; providing a second light source, the second The light source emits a second light, the second light is white light, and the second light has a color temperature ranging from 1800K to 7500K; and driving the first light source and the second light source to make the first light and the second light The light is mixed into a mixed light, and the mixed light is also white light. The low blue light mixing method of claim 12, further comprising the steps of: adjusting at least one of a driving current for driving the first light source and/or a driving current of the second light source to correct the mixed light. An optical property. The method of claim 12, further comprising the steps of: providing a third light source, the third light source emitting a third light, the third light having a color temperature ranging from 1800K to 7500K; Driving the third light source to mix the third light with the first light and the second light into the mixed light; Adjusting at least one of a driving current for driving the first light source, a driving current of the second light source, and a driving current of the third light source to correct an optical characteristic of the mixed light. The low blue light mixing method of claim 13, wherein the first light has a wavelength ranging from 500 nm to 550 nm. The low blue light mixing method of claim 13, wherein the first light has a wavelength ranging from 510 nm to 540 nm. The low blue light mixing method of claim 13, wherein the second light has a color temperature ranging from 2700K to 6500K. The low blue light mixing method of claim 13, wherein the second light has a color temperature ranging from 3000K to 5700K. For example, in the low blue light mixing method described in claim 13, the color temperature of the mixed light is higher than the color temperature of the second light. The low blue light mixing method of claim 14, wherein the color temperature of the third light is higher than the color temperature of the mixed light, and the color temperature of the mixed light is higher than the color temperature of the second light. The low blue light mixing method of claim 20, wherein the third light has a blue light energy ratio higher than a blue light energy ratio of the mixed light, and the mixed light has a blue light energy ratio higher than the second The proportion of blue light energy in light. The low blue light mixing method of claim 13 or 14, wherein the optical characteristic comprises a light intensity, a color temperature, and a blue light energy ratio. The low blue light mixing method of claim 14, wherein the second light is a warm white light, and the third light is a cool white light. A low blue light illumination device comprising: a first light source emitting a first light having a wavelength range of 380nm~410nm; a second light source emits a second light, the second light is white light, and the color temperature ranges from 1800K to 7500K; a driving module is electrically connected to the first light source and the second light source The driving module respectively drives the first light source and the second light source to mix the first light and the second light into a mixed light, and the mixed light is also white light. The low blue light illumination device of claim 24, wherein the second light has a color temperature ranging from 2700K to 6500K. The low blue light illumination device of claim 24, wherein the second light has a color temperature ranging from 3000K to 5700K. The low blue light illumination device of claim 24, wherein the color temperature of the mixed light is higher than the color temperature of the second light.