CN107454718B - LED lamp light source with color temperature correcting function and optical system - Google Patents
LED lamp light source with color temperature correcting function and optical system Download PDFInfo
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- CN107454718B CN107454718B CN201710767453.0A CN201710767453A CN107454718B CN 107454718 B CN107454718 B CN 107454718B CN 201710767453 A CN201710767453 A CN 201710767453A CN 107454718 B CN107454718 B CN 107454718B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 29
- 239000011159 matrix material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 238000010586 diagram Methods 0.000 description 6
- 239000003086 colorant Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000005286 illumination Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention relates to an LED lamp light source with a color temperature correction function and an optical system, wherein the LED lamp light source comprises a control unit, a driving circuit and an LED light source module; the LED light source module is provided with a first color LED chip, a second color LED chip and a white light LED chip; when the target color coordinates are points outside the intersection point of the target color coordinate color isotherm and the blackbody line in the color coordinate system, the first color LED chip and the second color LED chip are respectively positioned at two sides of the target color coordinate color isotherm and are symmetrical by taking the target color coordinates as centers; or when the target color coordinates are the intersection points of the target color coordinate color isotherm and the blackbody line in the color coordinate system, the second-color LED chip is positioned on the extension line of the connection line of the first-color LED chip and the target color coordinates; the control unit controls the driving current of the first color LED chip and the second color LED chip through the driving circuit so as to enable the color temperature of the LED light source module to be corrected to the target color temperature. The invention can compensate the color temperature drift generated in the production process of the white light LED chip, so that a user can more accurately control the color temperature and the color coordinates of the lamp.
Description
Technical Field
The invention relates to the technical field of projection and illumination, in particular to an LED lamp light source with a color temperature correction function and an optical system.
Background
Traditional high-power lighting devices, such as stage lamps, are based on gas discharge bulb light sources (commonly known as HID lamps), collect light sources through reflecting cups, and refract or image light rays through light path lenses to achieve the effect of stage lighting or manufacturing various stage scenes. In general, the light source is a standard white light source, and because of the process control problem in the production process, the light source has color coordinates and color temperature drift, which affects the consistency of products and reduces the yield of the products, so that the end customer is not fully satisfied in practical application.
In recent years, along with the wider application of LED solid-state light sources to stage lamps, there is a trend of gradually replacing HID light sources, but LED light sources inevitably cause drift target values of LED color temperature in the production process of chips, fluorescent powder materials, packages and the like, resulting in production consistency of batches. In reality, the LED light sources are produced and used by sorting in Bin (color separation coordinate area). However, for some high-power LED light sources, COB packaging is performed by a plurality of LED chips, and due to inconsistent batch quality of the chips, accumulation of color temperature difference is most likely to be caused, so that serious color temperature drift phenomenon occurs in the final LED light source module, and the serious color temperature drift can exceed 6000k±500K.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an LED lamp light source with a color temperature correction function, which can compensate color temperature drift generated in the production process of white light LED chips, control the consistency of products in the same batch or even different batches, improve the production yield and enable a user to control the color temperature and the color coordinates of a lamp more accurately.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the LED light source with the color temperature correction function comprises a control unit, a driving circuit and an LED light source module; the LED light source module is provided with a first color LED chip, a second color LED chip and a white light LED chip; when the target color coordinates are points outside the intersection point of the target color coordinate color isotherm and the blackbody line in the color coordinate system, the first color LED chip and the second color LED chip are respectively positioned at two sides of the target color coordinate color isotherm and are symmetrical by taking the target color coordinates as centers; or when the target color coordinates are the intersection points of the target color coordinate color isotherm and the blackbody line in the color coordinate system, the second-color LED chip is positioned on the extension line of the connection line of the first-color LED chip and the target color coordinates; the control unit controls the driving current of the first color LED chip and the second color LED chip through the driving circuit so as to enable the color temperature of the LED light source module to be corrected to the target color temperature.
When the LED light source module is produced, the target color temperature of the light emitted by the LED light source module is determined according to the requirement of a user, the position of the target color temperature in a CIE1931 color coordinate system is a target color coordinate, the target color temperature corresponds to a target color coordinate color isotherm in the CIE1931 color coordinate system, the color temperature of any point on the target color coordinate color isotherm is the target color temperature, and the intersection point of the target color coordinate color isotherm and the blackbody line is a standard target color temperature.
In the above scheme, the first color LED chip and the second color LED chip are arranged according to the position of the target color coordinate in the color coordinate system, so that the control unit can correct the color temperature of the LED light source module to the target color temperature by controlling the driving current of the two color chips through the driving circuit. The light source can compensate color temperature drift generated in the production process of the white light LED chip, control the consistency of products in the same batch or even different batches, achieve the effect of +/-100K, improve the production yield and enable a user to control the color temperature and the color coordinates of the lamp more accurately.
Of course, after the light source of the lamp is aged for a period of time, the color temperature drifts compared with the initial factory state, and the LED chips with different colors can be revised again to revise the color temperature of the initial factory state again.
Preferably, the first color LED chip and the second color LED chip are respectively a red light LED chip and a green light LED chip; or the first color LED chip and the second color LED chip are respectively a blue light LED chip and a yellow light LED chip. Further preferably, the light intensity of the blue light LED chip or the green light LED chip is 0% -10% of the total light intensity of the LED light source module, and the light intensity of the red light LED chip or the yellow light LED chip is 0% -30% of the total light intensity of the LED light source module.
After the LED light source module is provided with the LED chips for adjusting the color temperature, the actual color temperature drift of the product of the LED light source module can be adjusted during production, the proportion of the brightness of the LED chips with two colors is determined according to the degree of the color temperature drift, for example, when the overall color temperature is higher, the driving current of the red LED chips is properly increased to increase the output of the red LED chips, the higher color temperature is corrected to a target value, then the driving data of the red LED chips are written into the control unit through software control, and the control unit controls the driving circuit according to the driving data of the red LED chips to enable the LED light source module to emit the target color temperature when the LED light source module is started again next time.
Preferably, all the LED chips on the LED light source module are arranged in a matrix or in a regular polygon. The LED light source module is convenient to package.
Preferably, the number of the first color LED chips is the same as the number of the second color LED chips, and the arrangement of the first color LED chips and the second color LED chips on the LED light source module is the same. The arrangement enables the mixed light spots formed by the LED light source module to have good uniformity.
Another object of the present invention is to provide an LED lamp optical system with a color temperature correction function, using the LED lamp light source, and further comprising a collimating lens for collimating the light emitted from the LED light source module, and a condensing lens located at the rear end of the collimating lens for focusing the light emitted from the collimating lens.
The LED lamp optical system with the color temperature correction function provided by the invention has the advantages that the color temperature of emitted light is the target color temperature, and the uniformity of light spots is good.
Preferably, the number of the collimating lenses is at least two, and the size of the collimating lenses gradually increases from the LED light source module to the condensing lens. This arrangement allows for better collimation of the light exiting the collimating lens. Further preferably, the number of the collimating lenses is two.
Preferably, an optical integrator is further provided between the collimator lens and the condenser lens, and the optical integrator is used for homogenizing the light emitted from the collimator lens. This arrangement can better ensure uniformity of the light beam emitted from the optical system.
Preferably, the optical integration device is a fly eye lens or a light guide rod. The light guide rod can be of a hollow structure or a solid structure.
Compared with the prior art, the invention has the beneficial effects that:
according to the LED lamp light source with the color temperature correcting function, the first color LED chip and the second color LED chip are arranged according to the position of the target color coordinate in the color coordinate system, so that the control unit can correct the color temperature of the LED light source module to the target color temperature by controlling the driving current of the two color chips through the driving circuit; the LED lamp optical system with the color temperature correction function provided by the invention has the advantages that the color temperature of emitted light is the target color temperature, and the uniformity of light spots is good.
Drawings
Fig. 1 is a schematic diagram of an LED light source module in an LED light source with a color temperature correction function in this embodiment, where W represents a white LED chip, R represents a first color LED chip, and B represents a second color LED chip.
Fig. 2 is a light path diagram of an LED lamp optical system with a color temperature correction function according to the present embodiment.
Fig. 3 is a schematic diagram of a target color coordinate color isotherm and the positions of two color LED chips in the CIE1931 color coordinate system, wherein it is assumed that the target color temperature is 6500k, the r-point red LED chip is a first color LED chip, and the B-point cyan LED chip is a second color LED chip.
Detailed Description
The invention is further described below in connection with the following detailed description. Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.
Examples
The embodiment of the LED light source with the color temperature correction function comprises a control unit, a driving circuit and an LED light source module 1; the schematic diagram of the LED light source module 1 is shown in fig. 1, and the LED light source module 1 is provided with a first color LED chip, a second color LED chip and a white light LED chip; when the target color coordinates are points outside the intersection point of the target color coordinate color isotherm and the blackbody line in the color coordinate system, the first color LED chip and the second color LED chip are respectively positioned at two sides of the target color coordinate color isotherm and are symmetrical by taking the target color coordinates as centers; or when the target color coordinates are the intersection points of the target color coordinate color isotherm and the blackbody line in the color coordinate system, the second-color LED chip is positioned on the extension line of the connection line of the first-color LED chip and the target color coordinates; the control unit controls the driving currents of the first color LED chip and the second color LED chip through the driving circuit so as to enable the color temperature of the LED light source module 1 to be corrected to the target color temperature.
When the LED light source module 1 is produced, the target color temperature of the light emitted by the LED light source module 1 is determined according to the requirement of a user, the position of the target color temperature in the CIE1931 color coordinate system is the target color coordinate, the target color temperature corresponds to a target color coordinate color isotherm in the CIE1931 color coordinate system, the color temperature of any point on the target color coordinate color isotherm is the target color temperature, the intersection point of the target color coordinate color isotherm and the blackbody line is the standard target color temperature, and fig. 3 is a schematic diagram of the positions of the target color coordinate color isotherm and the two color LED chips in the CIE1931 color coordinate system.
According to the LED lamp light source with the color temperature correcting function, the first color LED chip and the second color LED chip are arranged according to the position of the target color coordinate in the color coordinate system, so that the control unit can correct the color temperature of the LED lamp light source module 1 to the target color temperature by controlling the driving current of the two color chips through the driving circuit. The light source can compensate color temperature drift generated in the production process of the white light LED chip, control the consistency of products in the same batch or even different batches, achieve the effect of +/-100K, improve the production yield and enable a user to control the color temperature and the color coordinates of the lamp more accurately.
Of course, after the light source of the lamp is aged for a period of time, the color temperature drifts compared with the initial factory state, and the LED chips with different colors can be revised again to revise the color temperature of the initial factory state again.
The first color LED chip and the second color LED chip are respectively a red light LED chip and a green light LED chip; or the first color LED chip and the second color LED chip are respectively a blue light LED chip and a yellow light LED chip. Specifically, the light intensity of the green light LED chip or the blue light LED chip is 0% -10% of the total light emitting intensity of the LED light source module, and the light intensity of the red light LED chip or the yellow light LED chip is 0% -30% of the total light emitting intensity of the LED light source module.
In this embodiment, as shown in fig. 1 and 3, assuming that the target color temperature is 6500K, the R-point red LED chip is a first color LED chip, and the B-point cyan LED chip is a second color LED chip, the color temperature adjustment process is illustrated: after the LED light source module 1 is provided with the LED chips for adjusting the color temperature, the actual color temperature drift of the product of the LED light source module 1 can be adjusted during production, the proportion of the brightness of the LED chips with two colors is determined according to the degree of the color temperature drift, for example, when the overall color temperature is higher, the driving current of the red LED chips is properly increased to increase the output of the red LED chips, the higher color temperature is corrected to the target value, then the driving data of the red LED chips are written into the control unit through software control, and the control unit controls the driving circuit according to the driving data of the red LED chips to enable the LED light source module 1 to emit the target color temperature when the LED light source module 1 is restarted next time.
In addition, all the LED chips on the LED light source module 1 are arranged in a matrix or in a regular polygon. This arrangement facilitates the packaging of the LED light source module 1.
The number of the first color LED chips is the same as the number of the second color LED chips, and the first color LED chips and the second color LED chips are arranged on the LED light source module 1 in the same manner. This arrangement allows the mixed spots formed by the LED light source module 1 to have good uniformity.
The schematic diagram of the LED lamp optical system with the color temperature correction function is shown in fig. 2, and the LED lamp optical system further includes a collimating lens 2 for collimating the light emitted by the LED light source module 1, and a condensing lens 4 located at the rear end of the collimating lens 2 for focusing the light emitted from the collimating lens 2.
The LED lamp optical system with the color temperature correction function provided by the invention has the advantages that the color temperature of emitted light is the target color temperature, and the uniformity of light spots is good.
At least two collimating lenses 2 are provided, and the size of the collimating lenses gradually increases from the LED light source module 1 to the condensing lens 4. This arrangement makes the collimation of the light exiting the collimator lens 2 better. In the present embodiment, the number of collimator lenses 2 is two.
An optical integrator 3 is further provided between the collimator lens 2 and the condenser lens 4, and the optical integrator 3 homogenizes the light emitted from the collimator lens 2. This arrangement can better ensure uniformity of the light beam emitted from the optical system.
Wherein, the optical integrator 3 is a fly eye lens or a light guide rod. The light guide rod can be of a hollow structure or a solid structure.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (7)
1. The LED lamp optical system with the color temperature correction function is characterized by comprising an LED lamp light source, wherein the LED lamp light source comprises a control unit, a driving circuit and an LED light source module (1); the LED light source module (1) is provided with a first color LED chip, a second color LED chip and a white light LED chip; when the target color coordinates are points outside the intersection point of the target color coordinate color isotherm and the blackbody line in the color coordinate system, the first color LED chip and the second color LED chip are respectively positioned at two sides of the target color coordinate color isotherm and are symmetrical by taking the target color coordinates as centers; or when the target color coordinates are the intersection points of the target color coordinate color isotherm and the blackbody line in the color coordinate system, the second-color LED chip is positioned on the extension line of the connection line of the first-color LED chip and the target color coordinates; the control unit controls the driving current of the first color LED chip and the second color LED chip through the driving circuit so as to enable the color temperature of the LED light source module (1) to be corrected to a target color temperature;
the first color LED chip and the second color LED chip are respectively a red light LED chip and a green light LED chip; or the first color LED chip and the second color LED chip are respectively a blue light LED chip and a yellow light LED chip;
the light intensity of the green light LED chip or the blue light LED chip is 0-10% of the total light emitting intensity of the LED light source module, and the light intensity of the red light LED chip or the yellow light LED chip is 0-30% of the total light emitting intensity of the LED light source module;
the LED light source module also comprises a collimating lens (2) used for collimating the light emitted by the LED light source module (1), and a condensing lens (4) positioned at the rear end of the collimating lens (2) and used for focusing the light emitted from the collimating lens (2).
2. The LED lamp optical system with the color temperature correction function according to claim 1, wherein the number of the collimating lenses (2) is at least two, and the size of the collimating lenses gradually increases from the LED light source module (1) to the condensing lens (4).
3. An LED lamp optical system with a color temperature correction function according to claim 2, characterized in that the number of collimator lenses (2) is two.
4. The LED lamp optical system with the color temperature correction function according to claim 1, wherein an optical integrator (3) is further provided between the collimator lens (2) and the condenser lens (4), and the optical integrator (3) is configured to homogenize the light emitted from the collimator lens (2).
5. The LED lamp optical system with color temperature correction function according to claim 4, wherein the optical integrator (3) is a fly eye lens or a light guide rod.
6. The LED lamp optical system with color temperature correction function according to claim 1, wherein all LED chips on the LED light source module (1) are arranged in a matrix or in a regular polygon.
7. The LED lamp optical system with color temperature correction function according to claim 1 or 6, wherein the number of the LED chips of the first color is the same as the number of the LED chips of the second color, and the arrangement of the LED chips of the first color and the arrangement of the LED chips of the second color on the LED light source module (1) are the same.
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| CN201710767453.0A CN107454718B (en) | 2017-08-31 | 2017-08-31 | LED lamp light source with color temperature correcting function and optical system |
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| CN201710767453.0A CN107454718B (en) | 2017-08-31 | 2017-08-31 | LED lamp light source with color temperature correcting function and optical system |
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| CN107454718B true CN107454718B (en) | 2023-11-28 |
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| CN111050452B (en) * | 2019-12-06 | 2021-11-30 | 广州星迪智能光电科技有限公司 | Color temperature consistency matching method |
| CN112105127B (en) * | 2020-09-14 | 2021-07-27 | 广州市雅江光电设备有限公司 | Stage lamp color temperature control method and system, computer equipment and storage medium |
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