CN107420749B - Light emitting device capable of adjusting color temperature and color rendering index, adjusting method and lamp - Google Patents
Light emitting device capable of adjusting color temperature and color rendering index, adjusting method and lamp Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F21V19/00—Fastening of light sources or lamp holders
- F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
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Abstract
The invention provides a light emitting device with adjustable color temperature and color rendering index, a lamp with the light emitting device and a method for adjusting the color temperature and the color rendering index of an OLED light emitting device, wherein the light emitting device comprises an LED device; the OLED device is positioned on the light emitting side of the LED device and is provided with a first transparent electrode and a second transparent electrode; and a control circuit that adjusts the luminous intensity of the LED device. The light emitting device with the adjustable color temperature and the color rendering index can emit high-color-rendering composite white light with the display index more than 90 through the composite LED device and the OLED device, and can realize continuous adjustment of the color temperature and the color rendering index through adjustment of light intensity in the LED device.
Description
Technical Field
The present disclosure relates to lighting sources, and particularly to a light emitting device with adjustable color temperature and color rendering index, a lamp having the light emitting device with adjustable color temperature and color rendering index, and a method for adjusting the color temperature and color rendering index of an OLED light emitting device.
Background
In an OLED device, for a certain specific device structure, optical parameters such as a light-emitting spectrum, a color temperature, a color rendering index and the like are fixed and invariable; in practical applications, different color temperatures or color rendering indexes of lighting and display lamp devices are often required for different environments and different people.
Aiming at the adjustment of the color temperature and the color rendering index of the OLED, more solutions are adopted in the industry to adjust the structure of an OLED device, and mainly change a light-emitting layer and a light-emitting material of the OLED device.
In view of the above, it is desirable to provide a lamp having a light emitting device with adjustable color temperature and color rendering index and a method for adjusting the color temperature and the color rendering index of an OLED light emitting device to solve the above technical problems.
Disclosure of Invention
In order to solve one of the above problems, the present application provides a light emitting device with adjustable color temperature and color rendering index, a lamp having the light emitting device with adjustable color temperature and color rendering index, and a method for adjusting color temperature and color rendering index of an OLED light emitting device.
In order to achieve the above object, the present application provides a light emitting device with adjustable color temperature and color rendering index, characterized in that: comprises an LED device; the OLED device is positioned on the light emitting side of the LED device and is provided with a first transparent electrode and a second transparent electrode; and a control circuit that adjusts the luminous intensity of the LED device.
As a further improvement of the present invention, the light emitting device includes at least two LED devices with different light emitting wavelengths, and the control circuit can selectively control the light emitting intensity of any of the LED devices.
As a further improvement of the present invention, the first electrode and the second electrode of the LED device are respectively disposed on two opposite sides of the LED device along a direction perpendicular to a light emitting direction of the LED device; or the first electrode and the second electrode of the LED device are respectively arranged on two sides of the LED device along the light emergent direction of the LED device, and the electrode close to the OLED device side is a transparent electrode.
As a further improvement of the invention, the light-emitting color temperature range of the light-emitting device is 3600K to 5000K, and the color rendering index is more than 87.
As a further improvement of the invention, the light-emitting side of the OLED device is provided with a light-mixing layer.
In order to achieve the purpose, the invention further provides a lamp comprising the light-emitting device.
In order to achieve the above object, the present invention further provides a method for adjusting a color temperature and a color rendering index of an OLED device, including: providing an LED device, and arranging the OLED device and the LED device in parallel, wherein the OLED device is positioned on the light emitting side of the LED device and is provided with a first transparent electrode and a second transparent electrode;
and providing a control circuit, and adjusting the current value of the LED device through the control circuit so as to adjust the color temperature and the color rendering index of the OLED device.
As a further improvement of the present invention, at least two LED devices having different light emission wavelengths are provided, and the control circuit can selectively control the current value of any of the LED devices.
As a further improvement of the invention, the control circuit controls the luminous intensity of the LED device to be continuously adjusted between 0% and 100%.
As a further improvement of the invention, the light-emitting spectrum of the LED device is within the range of 400 nm-500 nm, and the light-emitting spectrum of the OLED device is within the range of 450 nm-760 nm.
The invention has the beneficial effects that: the light emitting device with the adjustable color temperature and the color rendering index can emit high-color-rendering composite white light with the display index more than 90 through the composite LED device and the OLED device, and can realize continuous adjustment of the color temperature and the color rendering index through adjustment of light intensity in the LED device.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1(a) is a schematic structural diagram of a light emitting device with adjustable color temperature and color rendering index according to the present invention;
FIG. 1(b) is a schematic structural diagram of another light emitting device with adjustable color temperature and color rendering index according to the present invention;
FIG. 2 is a spectrum of white light emitted from the OLED device of FIG. 1 with respect to the intensity of the emitted light;
FIG. 3(a) is a graph showing the emission intensity of 456nm blue light emitted from an LED device;
FIG. 3(b) is a spectrum diagram of the corresponding emission intensity of the 456nm blue light of FIG. 3(a) after recombination with the white light of the OLED device at different intensities;
FIG. 3(c) is a spectrum diagram in the middle portion wavelength of FIG. 3 (b);
FIG. 4(a) is a graph of the emission intensity of a 458nm blue light emitted by an LED device;
FIG. 4(b) is a spectrum of the emission intensity of the 458nm blue light of FIG. 4(a) at different intensities for the composite white light after it is combined with the white light of the OLED device;
FIG. 4(c) is a spectrum diagram in the middle portion wavelength of FIG. 4 (b);
FIG. 5(a) is a graph of the emitted 460nm blue light versus the luminous intensity of an LED device;
FIG. 5(b) is a spectrum diagram of the corresponding luminescence intensity of the composite white light of FIG. 5(a) after the 460nm blue light is combined with the white light of the OLED device at different intensities;
FIG. 5(c) is a spectrum diagram in the middle portion wavelength of FIG. 5 (b).
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
As shown in fig. 1(a) and 1(b), the light emitting device with adjustable color temperature and color rendering index of the present invention includes an OLED device, an LED device connected in parallel with the OLED device, a control circuit, and a housing. The control circuit is positioned on one side of the LED device, which is far away from the OLED device, the OLED device is positioned on the light emitting side of the LED device, and the control circuit and the OLED device are separated by a transparent insulating layer; the anode and the cathode of the OLED device are both transparent electrodes, light rays emitted by the LED device called as a first transparent electrode and a second transparent electrode penetrate through the transparent insulating layer and the OLED device and are combined with light emitted by the OLED device, and finally, composite white light is formed.
Specifically, the first electrode and the second electrode of the LED device are respectively disposed on two opposite sides of the LED device in a direction perpendicular to a light emitting direction of the LED device, and a current direction of the LED device is perpendicular to a light emitting direction. Or the first electrode and the second electrode of the LED device are respectively arranged on two sides of the LED device along the light emergent direction of the LED device, but the electrode close to the OLED device is a transparent electrode, and the light of the LED device is emitted outwards through the transparent electrode. The first electrode and the second electrode are respectively one of a cathode (-) and an anode (+).
The OLED device emits light within the range of 300-1500 nm, and the color of the OLED device can be various monochromatic light or composite light and other various colors of light; preferably, the light emission spectrum of the OLED device can also be selected to be in the range of 450nm to 760 nm. The light-emitting spectrum of the LED device is within the range of 400 nm-500 nm, and the color of the LED device can be various monochromatic lights, composite lights and other lights with various colors. The light of the LED device is combined with the light of the OLED device to form white light.
The control circuit is used for adjusting the current value of the LED device to adjust the luminous intensity of the LED device, so that the optical parameters of the composite white light are adjusted, and the white light with high color rendering is obtained. Of course, the control circuit can also be used for simultaneously adjusting the currents of the LED device and the OLED device, so that the optical parameters of the composite white light can be adjusted by adjusting the luminous intensities of the LED device and the OLED device.
Further, the light emitting device comprises at least two LED devices with different light emitting wavelengths, and the at least two LED devices are arranged on the same side of the OLED device side by side. The control circuit can selectively control the current value of any LED device, and the current value can be adjusted in a stepless manner within the range of 0-100%, so that the color temperature and the color rendering index of the OLED light-emitting device can be adjusted by adopting blue light with different wavelengths, and high-color-rendering white light with different requirements can be achieved.
In addition, the light-emitting side of the OLED device is provided with a light-mixing layer, such as an optical film or a light-mixing coating layer of a scattering sheet, a prism sheet and the like, so that the light-emitting of the light-emitting device is uniform.
The corresponding luminous intensity of the white light spectrum of the OLED device is shown in fig. 2, and the optical parameters obtained according to the OLED white light spectrum simulation are:
| optical parameters | Luminance (cd/m)2) | Color temperature (K) | Color rendering index | Color coordinates |
| White light | 1072 | 3563 | 89.9 | (0.4018,0.3888) |
The invention provides a method for adjusting the color temperature and the color rendering index of an OLED device based on the structure of the light-emitting device, which comprises the following steps: providing the LED device, and arranging an OLED device and the LED device in parallel, wherein the OLED device is positioned on the light-emitting side of the LED device and is provided with a transparent cathode and a transparent anode; and providing a control circuit, and adjusting the current value of the LED device through the control circuit, so as to adjust the luminous intensity of the LED device to change between 0% and 100% of the maximum luminous intensity, and adjust the color temperature and the color rendering index of the OLED luminous device.
Further, at least two LED devices with different light-emitting wavelengths can be provided, and the control circuit can selectively control the current value of any LED device, so that blue light with different wavelengths can be adopted to adjust the color temperature and the color rendering index of the OLED light-emitting device, and high-color-rendering white light with different requirements can be achieved.
Specifically, the luminous intensity of the LED device can be continuously adjusted in a stepless manner through the control circuit, so that the color temperature and the color rendering index of the composite white light can be continuously adjusted in a stepless manner.
The method for adjusting the color temperature and color rendering index of an OLED device will be described below with several specific examples.
Example 1
The white light spectrum and the luminous intensity of the OLED device are kept unchanged, the intensity of blue light with the wavelength of 456nm emitted by the LED device is adjusted, and the blue light is combined with the OLED white light under different brightness, so that the purpose of adjusting the color temperature and the color rendering index of the OLED white light is achieved. The intensity of the blue light emitted by the LED device is shown in fig. 3(a), and the spectrum and the light emission intensity of the composite white light corresponding to the blue light with different intensities are shown in fig. 3(b) and 3 (c).
The optical parameters obtained from the simulation of the composite white light spectrum are shown in the following table:
| optical parameters | Luminance (cd/m)2) | Color temperature (K) | Color rendering index |
| White light +456 x 0.1; | 1108.37 | 3660 | 90.9 |
| white light +456 x 0.2 | 1144.74 | 3763 | 91.6 |
| White light +456 x 0.4 | 1217.48 | 3995 | 92.0 |
| White light +456 x 0.6 | 1290.22 | 4263 | 91.4 |
| White light +456 x 0.8 | 1362.96 | 4578 | 90.4 |
| White light +456 x 1.0 | 1435.7 | 4950 | 89.0 |
Wherein, 0.1, 0.2, 04, 0.6, 0.8, 1.0 in fig. 3(b), 3(c) and the above tables indicate that the 458nm blue light emission intensity is 10%, 20%, 40%, 60%, 80%, 100% of the maximum emission intensity thereof, respectively; "white light +458 × 0.1" means: the intensity of the 458nm blue light emitted by the LED device is adjusted to be 10% of the maximum light intensity, and then the blue light and the white light emitted by the OLED device are compounded to form compound white light. The meanings of the proportional parameters in the following figures and tables are the same as above, and are not described again.
As can be seen from the above table, the color temperature gradually increases with the increase of the intensity of the blue light emitted by the LED device, and the color rendering index increases first and then decreases, and reaches the maximum when the intensity of the blue light is 0.4; the user can control the intensity of the blue light according to actual needs to obtain the required composite white light.
Example 2
The white light spectrum and the luminous intensity of the OLED device are kept unchanged, the intensity of blue light with the wavelength of 458nm emitted by the LED device is adjusted, and the blue light is combined with the OLED white light under different brightness, so that the purpose of adjusting the color temperature and the color rendering index of the OLED white light is achieved. The intensity of the blue light emitted by the LED device is shown in fig. 4(a), and the spectrum and the light emission intensity of the composite white light corresponding to the blue light with different intensities are shown in fig. 4(b) and 4 (c).
The optical parameters obtained from the simulation of the composite white light spectrum are shown in the following table:
| optical parameters | Luminance (cd/m)2) | Color temperature (K) | Color rendering index |
| White light +458 x 0.1 | 1125.29 | 3656 | 90.9 |
| White light +458 x 0.2 | 1178.58 | 3754 | 91.6 |
| White light +458 x 0.4 | 1285.16 | 3973 | 91.8 |
| White light +458 x 0.6 | 1391.74 | 4222 | 91.2 |
| White light +458 x 0.8 | 1498.32 | 4510 | 90.1 |
| White light +458 x 1.0 | 1604.9 | 4843 | 88.6 |
As can be seen from fig. 4(b), 4(c) and the above table, the color temperature gradually increases with the increase of the intensity of the blue light emitted from the LED device, and the color rendering index increases first and then decreases, and reaches the maximum when the intensity of the blue light is 0.4; the user can control the intensity of the blue light according to actual needs to obtain the required composite white light.
Example 3
The white light spectrum and the luminous intensity of the OLED device are kept unchanged, the intensity of the blue light with the wavelength of 460nm emitted by the LED device is adjusted, and the blue light is combined with the OLED white light under different brightness, so that the purpose of adjusting the color temperature and the color rendering index of the OLED white light is achieved. The intensity of the blue light emitted by the LED device is shown in fig. 5(a), and the spectrum and the light emission intensity of the composite white light corresponding to the blue light with different intensities are shown in fig. 5(b) and 5 (c).
The optical parameters obtained from the simulation of the composite white light spectrum are shown in the following table:
| optical parameters | Luminance (cd/m)2) | Color temperature (K) | Color rendering index |
| White light +460 × 0.1 | 1137.4 | 3659 | 91.0 |
| White light +460 × 0.2 | 1202.8 | 3760 | 91.6 |
| White light +460 × 0.4 | 1333.6 | 3984 | 91.7 |
| White light +460 × 0.6 | 1464.4 | 4238 | 90.8 |
| White light +460 × 0.8 | 1595.2 | 4529 | 89.4 |
| White light +460 x 1.0 | 1726 | 4863 | 87.6 |
As can be seen from fig. 5(b), 5(c) and the above table, the color temperature gradually increases with the increase of the intensity of the blue light emitted from the LED device, and the color rendering index increases first and then decreases, and reaches the maximum when the intensity of the blue light is 0.4; the user can control the intensity of the blue light according to actual needs to obtain the required composite white light.
According to the specific embodiment, the color temperature and the color rendering index of the OLED white light can be adjusted by adjusting the intensity of the blue light emitted by the LED device, and the high color rendering white light with the color temperature of 3600K-5000K and the display index of more than 90 is realized.
Example 4
In this embodiment, 3 LED devices with wavelengths of 456nm, 458nm, and 460nm are respectively connected in parallel with the OLED device, and the three LED devices are arranged side by side. The white light spectrum and the luminous intensity of the OLED device are unchanged, and the intensity of blue light emitted by at least one of the LED devices with the wavelengths of 456nm, 458nm and 460nm can be selectively adjusted, so that the blue light is compounded with the OLED white light under different brightness, and the purpose of adjusting the color temperature and the color rendering index of the OLED white light is achieved. The effect of individually adjusting the luminous intensity of the LED devices with wavelengths of 456nm, 458nm, and 460nm on the OLED white light is the same as that in embodiment 1, embodiment 2, and embodiment 3, and is not described again. Of course, the light emitting intensity of a plurality of LED devices can be adjusted simultaneously to adjust the color temperature and the color rendering index of the OLED device. And meanwhile, compared with the mode of independently adjusting one LED device, the luminous intensity of a plurality of LED devices is adjusted, the shape of a spectrum can be adjusted, and better light color rendering characteristics are realized.
In summary, the light emitting device with adjustable color temperature and color rendering index of the invention can emit composite white light with higher color rendering index through the composite LED device and the OLED device, and can continuously adjust the color temperature range of the white light emitted by the OLED device to be between 3600K and 5000K through adjusting the light intensity in the LED device, and the color rendering index is above 87.
In addition, the invention also provides a lamp with the light-emitting device, and the color temperature and the color rendering index of the lamp can be adjusted by the adjusting method.
It should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art will be able to make the description as a whole, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.
The above detailed description is merely illustrative of possible embodiments of the present invention and is not intended to limit the scope of the invention, which is intended to include all equivalent embodiments or modifications within the scope of the present invention without departing from the technical spirit of the present invention.
Claims (11)
1. A light emitting device capable of adjusting color temperature and color rendering index is characterized in that: comprises an LED device;
the OLED device is positioned on the light emitting side of the LED device and is provided with a first transparent electrode and a second transparent electrode;
and a control circuit that adjusts the luminous intensity of the LED device.
2. The light emitting device with adjustable color temperature and color rendering index according to claim 1, wherein: the light emitting device comprises at least two LED devices with different light emitting wavelengths, and the control circuit can selectively control the light emitting intensity of any LED device.
3. The light emitting device of claim 1 or 2, wherein: the first electrode and the second electrode of the LED device are respectively arranged on two opposite sides of the LED device along the direction vertical to the light emitting direction of the LED device; or the first electrode and the second electrode of the LED device are respectively arranged on two sides of the LED device along the light emergent direction of the LED device, and the electrode close to the OLED device side is a transparent electrode.
4. The light emitting device of claim 1 or 2, wherein: the light-emitting color temperature range of the light-emitting device is 3600K-5000K, and the color rendering index is more than 87.
5. The light emitting device of claim 1 or 2, wherein: and the light-emitting side of the OLED device is provided with a light-mixing layer.
6. The color temperature and color rendering index adjustable light-emitting device according to claim 1 or 2, wherein the light-emitting spectrum of the LED device is in a range of 400nm to 500nm, and the light-emitting spectrum of the OLED device is in a range of 450nm to 760 nm.
7. A lamp capable of adjusting color temperature and color rendering index is characterized in that: a light-emitting device comprising the light-emitting device according to any one of claims 1 to 5.
8. A method for adjusting the color temperature and the color rendering index of an OLED device is characterized in that:
providing an LED device, and arranging the OLED device and the LED device in parallel, wherein the OLED device is positioned on the light emitting side of the LED device and is provided with a first transparent electrode and a second transparent electrode; and providing a control circuit, and adjusting the current value of the LED device through the control circuit so as to adjust the color temperature and the color rendering index of the OLED device.
9. The method of claim 8, wherein the method further comprises: at least two LED devices with different light-emitting wavelengths are provided, and the control circuit can selectively control the current value of any LED device.
10. The method of claim 8, wherein the method further comprises: the control circuit controls the luminous intensity of the LED device to be continuously adjusted between 0% and 100%.
11. The method of claim 8 or 9, wherein the light spectrum of the LED device is in the range of 400nm to 500nm, and the light spectrum of the OLED device is in the range of 450nm to 760 nm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2780382C1 (en) * | 2022-03-17 | 2022-09-22 | Федеральное государственное бюджетное учреждение науки Научно-технологический центр уникального приборостроения Российской академии наук (НТЦ УП РАН) | White light led with composite phosphor |
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| CN107420749A (en) | 2017-12-01 |
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