WO2019109917A1 - Color calibration system for rgb light device and method thereof - Google Patents

Color calibration system for rgb light device and method thereof Download PDF

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Publication number
WO2019109917A1
WO2019109917A1 PCT/CN2018/119210 CN2018119210W WO2019109917A1 WO 2019109917 A1 WO2019109917 A1 WO 2019109917A1 CN 2018119210 W CN2018119210 W CN 2018119210W WO 2019109917 A1 WO2019109917 A1 WO 2019109917A1
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WIPO (PCT)
Prior art keywords
light
luminous flux
rgb
color
maximum luminous
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PCT/CN2018/119210
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English (en)
French (fr)
Inventor
Xiaorong CHU
Xia Wang
Jinxiang Shen
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Sengled Co., Ltd.
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Publication of WO2019109917A1 publication Critical patent/WO2019109917A1/en

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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
    • 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
    • H05B45/22—Controlling the colour of the light using optical feedback

Definitions

  • the present disclosure relates to the field of RGB light device technologies and, more particularly, relates to a color calibration system for an RGB light device and a related method.
  • RGB light device The color system formed by the three primary colors of RGB (red, green, and blue) can produce almost all the colors that human vision can perceive and is one of the most widely used color systems. By mixing the three primary colors of RGB in different proportions and strengths, various colors of nature may be obtained.
  • the colors are usually set according to the known preparation parameters of the RGB colors.
  • the actual values such as the light-emitting luminance of R, G, and B light-emitting elements of each light device, are different from the theoretical values.
  • the minor difference of each light-emitting element is inevitable and different. Therefore, even for light devices having the same configuration and the same setting of the RGB preparation parameters, it may be also difficult to ensure the consistency of the color and brightness of the light devices.
  • the color and brightness will be attenuated as the usage time elapses, so that the light device, after using for a period of time, cannot achieve its original color and brightness characteristics. This type of problems, especially existing in a system using multiple light devices, create significant visual differences.
  • the existing technology does not provide a color calibration method for the RGB light device.
  • the present disclosure provides a solution for color calibration in color light devices, thereby providing display consistency of the color light devices.
  • the disclosed method and system are directed to solve one or more problems set forth above and other problems.
  • the system may include the RGB light device, a terminal device, and a detecting device.
  • the terminal device may be configured to control the RGB light device to emit three-color light at a rated maximum luminous flux.
  • the detecting device may be configured to detect an actual maximum luminous flux of the three-color light emitted by the RGB light device.
  • the terminal device may be connected with the RGB light device and the detecting device, respectively.
  • the RGB light device may be further configured to determine a pulse width modulation (PWM) duty ratio of the three-color light according to the rated maximum luminous flux and the actual maximum luminous flux, thereby achieving good consistency of the color light devices and offering a solution for color calibration in the color light devices.
  • PWM pulse width modulation
  • the detecting device may be coupled with the RGB light device through the terminal device, and configured to send the actual maximum luminous flux of the three-color light to the RGB light device through the terminal device.
  • the RGB light device may include at least one color matching interface, at least one RGB light-emitting module, and a processor.
  • the at least one color matching interface and the at least one RGB light-emitting module may be connected with the processor, respectively.
  • the terminal device may be configured to send a control instruction to the RGB light device through the at least one color matching interface, and the processor may be configured to receive the control instruction, and, according to the control instruction, control the at least one RGB light-emitting module to emit the three-color light at the rated maximum luminous flux.
  • the RGB light device may include a calibration interface.
  • the terminal device may be coupled to the calibration interface and send the actual maximum luminous flux of the three-color light to the RGB light device through the calibration interface.
  • the processor of the RGB light device may be connected with the calibration interface, and configured to acquire the actual maximum luminous flux of the three-color light through the calibration interface.
  • the processor may be configured to: determine a luminous flux calibration coefficient of the three-color light according to a ratio of the actual maximum luminous flux to the rated maximum luminous flux, and determine the PWM duty ratio of the three-color light according to the luminous flux calibration coefficient, a target RGB value, an RGB color mixing standard ratio, and the rated maximum luminous flux.
  • the RGB light device may be wirelessly coupled to the terminal device.
  • the processor may be further configured to: determine a luminous flux calibration coefficient of red light Kr according to a formula determine a luminous flux calibration coefficient of green light Kg according to a formula and determining a luminous flux calibration coefficient of blue light Kb according to a formula
  • ⁇ (Re max ) is a rated maximum luminous flux of the red light
  • ⁇ (G e max ) is a rated maximum luminous flux of the green light
  • ⁇ (B e max ) is a rated maximum luminous flux of the blue light.
  • ⁇ (R b max ) is an actual maximum luminous flux of the red light
  • ⁇ (Gb max ) is an actual maximum luminous flux of the green light
  • ⁇ (Bb max ) is an actual maximum luminous flux of the blue light.
  • the processor may be further configured to: determine a PWM duty ratio of the red light R (PWM%) according to a formula determine a PWM duty ratio of the green light G (PWM%) according to a formula and determine a PWM duty ratio of the blue light B (PWM%) according to a formula
  • Rin is a target RGB value of the red light
  • Gin is a target RGB value of the green light
  • Bin is a target RGB value of the blue light.
  • ⁇ (Rb) is a luminous flux of the red light under a color mixing standard ratio
  • ⁇ (G b) is a luminous flux of the green light under the color mixing standard ratio
  • ⁇ (B b) is a luminous flux of the blue light under the color mixing standard ratio.
  • the method may include sending, by a terminal device, a control instruction to the RGB light device.
  • the control instruction may be utilized to instruct the RGB light device to emit three-color light at a rated maximum luminous flux.
  • the RGB light device may receive the control instruction to emit the three-color light at the rated maximum luminous flux.
  • a detecting device may be configured to detect an actual maximum luminous flux of the three-color light, and transmit the actual maximum luminous flux to the RGB light device.
  • the RGB light device may be configured to determine a pulse width modulation (PWM) duty ratio of the three-color light according to the actual maximum luminous flux and the rated maximum luminous flux.
  • PWM pulse width modulation
  • determining, by the RGB light device, the PWM duty ratio of the three-color light according to the actual maximum luminous flux and the rated maximum luminous flux may include: determining, by the RGB light device, a luminous flux calibration coefficient of the three-color light according to a ratio of the actual maximum luminous flux to the rated maximum luminous flux, and determining the PWM duty ratio of the three-color light according to the luminous flux calibration coefficient, a target RGB value, an RGB color mixing standard ratio, and the rated maximum luminous flux.
  • determining the luminous flux calibration coefficient of the three-color according to the ratio of the actual maximum luminous flux to the rated maximum luminous flux may include: determining, by the RGB light device, a luminous flux calibration coefficient of red light Kr according to a formula determining, by the RGB light device, a luminous flux calibration coefficient of green light Kg according to a formula and determining, by the RGB light device, a luminous flux calibration coefficient of blue light Kb according to a formula
  • ⁇ (Re max ) is a rated maximum luminous flux of the red light
  • ⁇ (G e max ) is a rated maximum luminous flux of the green light
  • ⁇ (B e max ) is a rated maximum luminous flux of the blue light.
  • ⁇ (R b max ) is an actual maximum luminous flux of the red light
  • ⁇ (Gb max ) is an actual maximum luminous flux of the green light
  • ⁇ (Bb max ) is an actual maximum luminous flux of the blue light.
  • determining the PWM duty ratio of the three-color light according to the luminous flux calibration coefficient, the target RGB value, the RGB color mixing standard ratio, and the rated maximum luminous flux may include: determining a PWM duty ratio of the red light R (PWM%) according to a formula determining a PWM duty ratio of the green light G (PWM%) according to a formula and determining a PWM duty ratio of the blue light B (PWM%) according to a formula Rin is a target RGB value of the red light, Gin is a target RGB value of the green light, andBin is a target RGB value of the blue light.
  • ⁇ (Rb) is a luminous flux of the red light under a color mixing standard ratio
  • ⁇ (G b) is a luminous flux of the green light under the color mixing standard ratio
  • ⁇ (B b) is a luminous flux of the blue light under the color mixing standard ratio.
  • the RGB light device may include at least one color matching interface, at least one RGB light-emitting module, and a processor connected to the at least one color matching interface and the at least one RGB light-emitting module, respectively.
  • the processor may be configured to receive a control instruction from the terminal device through the at least one color matching interface, and control the at least one RGB light-emitting module to emit three-color light at a rated maximum luminous flux.
  • the RGB light device may be detected by a detecting device to obtain an actual maximum luminous flux of the three-color light emitted by the at least one RGB light-emitting module.
  • the processor may be further configured to determine a pulse width modulation (PWM) duty ratio of the three-color light according to the rated maximum luminous flux and the actual maximum luminous flux.
  • PWM pulse width modulation
  • the RGB light device may be coupled with the detecting device through the terminal device, and configured to receive the actual maximum luminous flux of the three-color light from the detecting device through the terminal device.
  • the RGB light device may include a calibration interface that is coupled to the terminal device, and configured to receive the actual maximum luminous flux of the three-color light through the calibration interface.
  • the processor may be connected with the calibration interface, and the processor may be configured to acquire the actual maximum luminous flux of the three-color light through the calibration interface.
  • the processor may be configured to: determine a luminous flux calibration coefficient of the three-color light according to a ratio of the actual maximum luminous flux to the rated maximum luminous flux, and determine the PWM duty ratio of the three-color light according to the luminous flux calibration coefficient, a target RGB value, an RGB color mixing standard ratio, and the rated maximum luminous flux.
  • the RGB light device may be wirelessly coupled to the terminal device.
  • the processor may be further configured to: determine a luminous flux calibration coefficient of red light Kr according to a formula determine a luminous flux calibration coefficient of green light Kg according to a formula and determining a luminous flux calibration coefficient of blue light Kb according to a formula
  • ⁇ (Re max ) is a rated maximum luminous flux of the red light
  • ⁇ (G e max ) is a rated maximum luminous flux of the green light
  • ⁇ (B e max ) is a rated maximum luminous flux of the blue light.
  • ⁇ (R b max ) is an actual maximum luminous flux of the red light
  • ⁇ (Gb max ) is an actual maximum luminous flux of the green light
  • ⁇ (Bb max ) is an actual maximum luminous flux of the blue light.
  • the processor may be further configured to: determine a PWM duty ratio of the red light R (PWM%) according to a formula determine a PWM duty ratio of the green light G (PWM%) according to a formula and determine a PWM duty ratio of the blue light B (PWM%) according to a formula
  • Rin is a target RGB value of the red light
  • Gin is a target RGB value of the green light
  • Bin is a target RGB value of the blue light.
  • ⁇ (Rb) is a luminous flux of the red light under a color mixing standard ratio
  • ⁇ (G b) is a luminous flux of the green light under the color mixing standard ratio
  • ⁇ (Bb) is a luminous flux of the blue light under the color mixing standard ratio.
  • the terminal device may be configured to send the control instruction to the RGB light device, and control the RGB light device to emit the three-color light at the rated maximum luminous flux
  • the detecting device may be configured to detect the actual maximum luminous flux of the three-color light emitted by the RGB light device and transmit the actual maximum luminous flux to the RGB light device.
  • the RGB light device may be further configured to determine the PWM duty ratio of the three-color light according to the rated maximum luminous flux and the actual maximum luminous flux, thereby obtaining a calibrated RGB luminous flux and realizing an accurate calibration of the luminous flux of the RGB light device to ensures consistency in color and brightness of each RGB light device.
  • FIG. 1 is a schematic structural diagram of a color calibration system for an RGB light device according to some embodiments of the present disclosure
  • FIG. 2 is a schematic structural diagram of another color calibration system for an RGB light device according to some embodiments of the present disclosure
  • FIG. 3 is a flow diagram of a color calibration method for an RGB light device according to some embodiments of the present disclosure.
  • FIG. 4 is a flow diagram of another color calibration method for an RGB light device according to some embodiments of the present disclosure.
  • RGB light device 10: RGB light device
  • 20 terminal device
  • 30 detecting device
  • 110 color matching interface
  • 120 RGB light-emitting module
  • 130 processor
  • 140 calibration interface
  • a terminal device may be configured to send a control instruction to the RGB light device, and control the RGB light device to emit three-color light at a rated maximum luminous flux
  • a detecting device may be configured to detect an actual maximum luminous flux of the three-color light emitted by the RGB light device and transmit the actual maximum luminous flux to the RGB light device.
  • the RGB light device may be further configured to determine a PWM duty ratio of the three-color light according to the rated maximum luminous flux and the actual maximum luminous flux, thereby obtaining a calibrated RGB luminous flux and realizing an accurate calibration of the luminous flux of the RGB light device to ensures consistency in color and brightness of each RGB light device.
  • FIG. 1 is a schematic structural diagram of a color calibration system for an RGB light device according to some embodiments of the present disclosure.
  • the system may include a terminal device 20, a detecting device 30, and an RGB light device 10.
  • the terminal device 20 may be connected with the RGB light device 10 and the detecting device 30 respectively.
  • the terminal device 20 may be configured to control the RGB light device 10 to emit three-color light at a rated maximum luminous flux.
  • the so-called “three-color light” or “tricolor light” includes red light, green light, and blue light.
  • the detecting device 30 may be configured to detect an actual maximum luminous flux of the three-color light emitted by the RGB light device 10.
  • the RGB light device 10 may be configured to determine a pulse width modulated (PWM) duty ratio of the three-color light based on the actual maximum luminous flux and the rated maximum luminous flux.
  • PWM pulse width modulated
  • the terminal device 20 may be a device having control and communication functions, such as a smart phone, a personal computer (PC) , a computer, or a host computer.
  • a smart phone such as a smart phone, a personal computer (PC) , a computer, or a host computer.
  • PC personal computer
  • the terminal device 20 may be configured to send a control instruction to the RGB light device 10 for instructing the RGB light device 10 to emit light under full current and/or 100%of the PWM. That is, the control instruction may be utilized to control the RGB light device 10 to emit the three-color light at the rated maximum luminous flux. After receiving the control instruction sent by the terminal device 20, the RGB light device 10 may be controlled to emit the three-color light according to the rated maximum luminous flux.
  • the detecting device 30 may be configured to detect the three-color light emitted by the RGB light device 10 and detect the actual maximum luminous flux of the three-color light emitted by the RGB light device 10.
  • the detecting device 30 may be turned on under the control of the terminal device 20 to detect the actual maximum luminous flux of the three-color light emitted by the RGB light device 10.
  • the detecting device 30 may also be provided with a sensor. The sensor may be triggered on when the three-color light emitted by the RGB light 10 is detected.
  • the detecting device 30 may be directly connected with the RGB light device 10 (direct connection not shown) and may be configured to transmit the actual maximum luminous flux of the collected three-color light to the RGB light device 10.
  • the detecting device 30 may be connected to the RGB light 10 through the terminal device 20, and the detecting device 30 may send the actual maximum luminous flux of the collected three-color light to the terminal device 20.
  • the terminal device 20 then may forward the actual maximum luminous flux of the three-color light to the RGB light device 10.
  • the RGB light device 10 may be configured to determine the PWM duty ratio of the three-color light according to the actual maximum luminous flux of the three-color light and the rated maximum luminous flux of the three-color light.
  • the three-color light includes red light, green light, and blue light.
  • the PWM duty ratio of the three-color light may be determined with respect to each of the primary colors, respectively.
  • a PWM duty ratio of the red light may be determined according to an actual maximum luminous flux of the red light and a rated maximum luminous flux of the red light.
  • a PWM duty ratio of the green light may be determined according to an actual maximum luminous flux of the green light and a rated maximum luminous flux of the green light.
  • a PWM duty ratio of the blue light may be determined according to an actual maximum luminous flux of the blue light and a rated maximum luminous flux of the blue light.
  • colors of the RGB light device 10 may be tuned based on the PWM duty ratio of the calibrated three-color light to obtain a calibrated RGB luminous flux.
  • the terminal device 20 may include a sending module, a receiving module, and a configuration module (not shown) .
  • the configuration module of the terminal device 20 may configure parameters of the RGB light device 10.
  • the sending module of the terminal device 20 may be configured to send instruction information to the detecting device 30 and the RGB light device 10.
  • the receiving module of the terminal device 20 may be configured to receive information sent by the detecting device 30.
  • the terminal device 20 and the RGB light device 10, and the terminal device 20 and the detecting device 30 may be both connected by wires.
  • the connection can be made by any existing connection manner such as connections through data lines or connections through network cables. Accordingly, functional structures of the terminal device 20, the detecting device 30, and the RGB light device 10 can be simplified, and installations of wireless communication module can be reduced. In this way, a system cost can be effectively reduced, and reliability and stability of the system can be accordingly improved.
  • a mode of wired and wireless hybrid connection may be utilized between the terminal device 20 and the detecting device 30, and between the terminal device 20 and the RGB light device 10.
  • a wired connection may be utilized between the terminal device 20 and the detecting device 30, while a wireless connection may be adopted between the terminal device 20 and the RGB light device 10.
  • the terminal device 20 and the detecting device 30 may be more compact in structures, smaller in size, and it becomes more convenient for a mobile operation.
  • the wired connection can effectively avoid the interference effect of the complex environment on the color calibration system and improve the reliability of the color calibration system.
  • the terminal device 20 and the detecting device 30 may be integrated into a single device.
  • the terminal device 20 and the RGB light device 10, and the terminal device 20 and the detecting device 30 may be connected through a wireless connection.
  • the wireless connection may include an existing communication connection manner, such as one of BLE (Bluetooth Low Energy) , WiFi (wireless network) , Bluetooth, ZigBee (Zigbee protocol) , Z-Wave, LoRa (physical layer or wireless modulation configured for establishing long-distance communication links) , NB-IOT (cell-based narrow-band Internet) , etc.
  • the terminal device 20 may further include a display module (not shown) that is configured to display configuration parameters of the RGB light device 10 and currently received information, and the display module may also be configured to search and display historical information.
  • a display module (not shown) that is configured to display configuration parameters of the RGB light device 10 and currently received information, and the display module may also be configured to search and display historical information.
  • the terminal device 20 may further include an indicating module (not shown) configured to indicate a signal connection state.
  • the indicating module may be configured to obtain an interconnection state of the terminal device 20 and other devices in the system in real time, so that, when an abnormal fault occurs, an abnormal point in the system can be quickly and timely detected, thereby improving an operation and maintenance convenience of the color calibration system.
  • the detecting device 30 may include a detecting module, a sending module, and a receiving module (not shown) .
  • the detecting module and the sending module may be connected through an internal circuit board, and the detecting module and the receiving module may also be connected through an internal circuit board.
  • the detecting module of the detecting device 30 may be configured to detect the actual maximum luminous flux emitted by the RGB light device 10
  • the sending module of the detecting device 30 may be configured to transmit the detected actual maximum luminous flux to the terminal device 20
  • the receiving module of the detecting device 30 may be configured to receive a detection instruction sent by the terminal device 20.
  • the receiving module of the detecting device 30 may be configured to trigger the detecting module to perform a detection of luminous flux of the RGB light device 10.
  • the detecting module may transmit the actual maximum luminous flux through an internal circuit after detecting the actual maximum luminous flux emitted by the RGB light device 10 to the sending module.
  • the sending module of the detecting device 30 may start transmitting after obtaining the actual maximum luminous flux and transmit information of the actual maximum luminous flux to the terminal device 20.
  • the connection between the detecting module, the sending module, and the receiving module in the detecting device 30 may be connected through any other connection manner in the existing technology, the connection of which is not limited in the present disclosure.
  • the detecting module, the sending module, and the receiving module can be connected by bus, the feature of which may facilitate an integration of different modules, simplify a manufacturing process of the detecting device 30, improve a quality rate in batch manufacturing, reduce the waste, and facilitate an easy maintenance and replacement of different modules at a low cost in later stages.
  • the sending module in the terminal device 20 and the sending module in the detecting device 30 can be wireless modules, respectively.
  • the receiving module in the terminal device 20 and the receiving module in the detecting device 30 can be wireless modules, respectively.
  • the detecting device 30 may further include an indicating module, and the indicating module may be configured to indicate an operation state of the detecting device 30.
  • the color calibration system for the RGB light device provides the RGB light device, the terminal device configured to control the RGB light device to emit three-color light according to the rated maximum luminous flux, and the detecting device configured to detect the actual maximum luminous flux of the three-color light emitted by the RGB light device.
  • the terminal device may be connected with the RGB light device and the detecting device respectively.
  • the RGB light device may be configured to determine the PWM duty ratio of the three-color light according to the actual maximum luminous flux and the rated maximum luminous flux, thereby issuing the calibrated RGB Luminous flux.
  • the embodiments of the present disclosure enable accurate calibration of the luminous flux of the RGB light device, thereby ensuring consistency in color and brightness of each RGB light device.
  • FIG. 2 is a schematic structural diagram of another color calibration system for an RGB light device according to some embodiments of the present disclosure.
  • the RGB light device 10 may include at least one color matching interface 110, at least one RGB light-emitting module 120 and a processor 130.
  • the at least one color matching interface 110 and the at least one RGB light-emitting module 120 are respectively connected with the processor 130.
  • the terminal device 20 may be configured to send a control instruction to the RGB light device 10 through the at least one color matching interface 110, and the processor 130 may receive the control instruction through the at least one color matching interface 110.
  • the RGB light-emitting module 120 may be controlled by the control instruction to emit the three-color light according to the rated maximum luminous flux.
  • the RGB light device 10 of the present embodiment may include the at least one RGB light-emitting module 120, the at least one color matching interface 110, and the processor 130.
  • the processor 130 may be connected with each of the at least one RGB light-emitting modules 120 and each of the at least one color matching interface 110, respectively.
  • the color matching interface 110 may be configured to receive the control instruction sent by the terminal device 20, and send the control instruction to the processor 130.
  • the processor 130 may be configured to control the RGB light-emitting module 120 to emit three-color light under the control instruction.
  • control instruction sent by the terminal device 20 and received by the color matching interface 110 may be utilized to instruct the RGB light device 10 to emit light according to the rated maximum luminous flux.
  • the color matching interface 110 may be configured to send the received control instruction to the processor 130, and the processor 130 may be configured to parse the control instruction and control the RGB light-emitting module 120 to emit light at the rated maximum luminous flux under the control instruction.
  • the color matching interface 110 may be a color matching interface for the whole of the RGB light-emitting module 120, or may be three color matching interfaces 110 corresponding to three colors of R (red) , G (green) , and B (blue) respectively.
  • the color matching interface 110 may be configured to receive the control instruction sent by terminal device 20. For example, an RGB (255, 255, 255) (white) control instruction may be selected on the terminal device 20, and the control instruction may be transmitted to the color matching interface 110 of the RGB light device 10 through a wireless communication module.
  • the color matching interface 110 may be configured to transmit the received control instruction to the processor 130, and the processor 130 may be configured to control the RGB light-emitting module 120 to emit white light at the rated maximum luminous flux.
  • the RGB light device 10 may include a calibration interface 140, and the terminal device 20 may be coupled with the RGB light device 10 through the calibration interface 140, and the actual maximum luminous flux of the three-color light may be sent and written to the RGB light device 10 through the calibration interface 140.
  • the RGB light device 10 may include an information storage medium for storing the actual maximum luminous flux, or the actual maximum luminous flux may be written to the processor 130 of the RGB light device 10.
  • the RGB light device 10 may further include the calibration interface 140.
  • the terminal device 20 may be coupled with the calibration interface 140. After the detecting device 30 detects the actual maximum luminous flux of the RGB light device 10, the detecting device 30 may transmit the actual maximum luminous flux to the terminal device 20. Next, the terminal device 20 may write the actual maximum luminous flux into the RGB light device 10 through the calibration interface 140, for example, being written to the processor 130 of the RGB light device 10.
  • the processor 130 of the RGB light device 10 may be connected with the calibration interface 140, and the processor 130 may acquire the actual maximum luminous flux of the three-color light through the calibration interface 140.
  • the processor 130 may be configured to determine a luminous flux calibration coefficient of the three-color light according to a ratio of the actual maximum luminous flux and the rated maximum luminous flux of the three-color light. According to the luminous flux calibration coefficient, a target RGB value, and an RGB color mixing standard ratio, and the rated maximum luminous flux, the PWM duty ratio of the three-color light may be determined.
  • the RGB color mixing standard ratio may refer to a relative intensity of the three primary color components. In some embodiments, the RGB color mixing standard ratio for red light, green light, and blue light may be 3: 6: 1.
  • the processor 130 in the RGB light device 10 may transmit the control instruction through the terminal device 20, and according to the three-color light emitted at the rated maximum luminous flux, the detecting device 30 may detect the three-color light emitted by the RGB light device 10, and transmit the actual maximum luminous flux of the three-color light emitted by the RGB light device 10 to the terminal device 20.
  • the terminal device 20 may transmit the actual maximum luminous flux of the three-color light emitted by the RGB light device 10 to the processor 130 of the RGB light device 10 through the calibration interface 140.
  • the processor 130 may determine a ratio of the rated maximum luminous flux of the three-color light to the actual maximum luminous flux of the three-color light as the luminous flux calibration coefficient of the three-color light.
  • a luminous flux calibration coefficient of red light Kr may be determined.
  • a luminous flux calibration coefficient of green light Kg may be determined.
  • a luminous flux calibration coefficient of blue light Kb may be determined.
  • ⁇ (Re max ) is a rated maximum luminous flux of the red monochromatic light
  • ⁇ (G e max ) is a rated maximum luminous flux of the green monochromatic light
  • ⁇ (B e max ) is a rated maximum luminous flux of the blue monochromatic light
  • ⁇ (R b max ) is an actual maximum luminous flux of the red monochromatic light
  • ⁇ (Gb max ) is an actual maximum luminous flux of the green monochromatic light
  • ⁇ (Bb max ) is an actual maximum luminous flux of the blue monochromatic light.
  • the processor 130 may determine the PWM duty ratio of the three-color light according to the luminous flux calibration coefficient, the target RGB value, the RGB color mixing standard ratio, and the rated maximum luminous flux. The specific manner may be described in the following.
  • a PWM duty ratio of the red light R (PWM%) may be determined.
  • a PWM duty ratio of the green light G (PWM%) may be determined.
  • a PWM duty ratio of the blue light B (PWM%) may be determined.
  • Rin is a target RGB value of the red monochromatic light
  • Gin is a target RGB value of the green monochromatic light
  • Bin is a target RGB value of the blue monochromatic light.
  • the target RGB value of the red monochromatic light herein may refer to a target level of the red monochromatic light that is represented by a range of decimal numbers from 0 to 255
  • the target RGB value of the green monochromatic light may refer to a target level of the green monochromatic light that is represented by a range of decimal numbers from 0 to 255
  • the target RGB value of the blue monochromatic light may refer to a target level of the blue monochromatic light that is represented by a range of decimal numbers from 0 to 255.
  • ⁇ (Rb) is a luminous flux of the red monochromatic light under a color mixing standard ratio
  • ⁇ (G b) is a luminous flux of the green monochromatic light under the color mixing standard ratio
  • ⁇ (B b) is a luminous flux of the blue monochromatic light under the color mixing standard ratio.
  • Sr, Sg, and Sb can be obtained as parameters, such as Sr, Sg, and Sb, depending on the color mixing standard ratio.
  • the color calibration system for the RGB light provides at least one color matching interface and at least one RGB light-emitting module in the RGB light device.
  • the terminal device may be connected with the RGB light device through the color matching interface.
  • the RGB light-emitting module may be controlled to emit the three-color light at the rated maximum luminous flux.
  • the calibration interface may be provided in the RGB light device, so that the terminal device may be connected with the RGB light device through the calibration interface.
  • the actual maximum luminous flux of the three-color light may be written into the RGB light device through the calibration interface.
  • the processor in the RGB light device may determine the luminous flux calibration coefficient of the three-color light according to the ratio of the actual maximum luminous flux of the three-color light to the rated maximum luminous flux of the three-color light, and determine the PWM duty ratio of the three-color light according to the luminous flux calibration coefficient, the target RGB value, the RGB color mixing standard ratio, and the rated maximum luminous flux, thereby achieving an accurate determination of the PWM duty ratio of the three-color light and improving the accuracy of the color calibration of the RGB light.
  • FIG. 3 is a flow diagram of a color calibration method for an RGB light device according to some embodiments of the present disclosure. As shown in FIG. 3, the method may include the following steps.
  • a terminal device may be configured to send a control instruction to an RGB light device, and the control instruction may be utilized to instruct the RGB light device to emit three-color light at a rated maximum luminous flux.
  • the method may be implemented by the color calibration system for the RGB light device as described in the above embodiments.
  • the RGB light device may be configured to receive the control instruction and emit the three-color light at the rated maximum luminous flux.
  • a detecting device may be configured to detect an actual maximum luminous flux of the three-color light, and transmit the actual maximum luminous flux to the RGB light device.
  • the RGB light device may be configured to determine a pulse width modulation (PWM) duty ratio of the three-color light according to the actual maximum luminous flux and the rated maximum luminous flux.
  • PWM pulse width modulation
  • the method according to the present disclosure may be implemented by the color calibration system for the RGB light device as described in the above embodiments, and the implementation principles and technical effects thereof are similar. The details are not repeated herein.
  • FIG. 4 is a flow diagram of another color calibration method for an RGB light device according to some embodiments of the present disclosure. Based on the foregoing embodiments of FIG. 3, the step of S104 may include the following steps.
  • the RGB light device may be configured to determine a luminous flux calibration coefficient of the three-color light according to a ratio of the actual maximum luminous flux to the rated maximum luminous flux.
  • a luminous flux calibration coefficient of red light Kr may be determined.
  • a luminous flux calibration coefficient of green light Kg may be determined.
  • a luminous flux calibration coefficient of blue light Kb may be determined.
  • ⁇ (R e max ) is a rated maximum luminous flux of the red monochromatic light
  • ⁇ (G e max ) is a rated maximum luminous flux of the green monochromatic light
  • ⁇ (B e max ) is a rated maximum luminous flux of the blue monochromatic light
  • ⁇ (R b max ) is an actual maximum luminous flux of the red monochromatic light
  • ⁇ (Gb max ) is an actual maximum luminous flux of the green monochromatic light
  • ⁇ (Bb max ) is an actual maximum luminous flux of the blue monochromatic light.
  • the step of S201 may further determine the luminous flux calibration coefficient of the three-color light according to any variant of the above formulae. For example, by modifying the ratio of the actual maximum luminous flux to the rated maximum luminous flux of the three-color light to acquire a modified coefficient, a product of the ratio of the actual maximum luminous flux to the rated maximum luminous flux and the modified coefficient may be obtained as the luminous flux calibration coefficient.
  • the RGB light device may be configured to determine a PWM duty ratio of the three-color light according to the luminous flux calibration coefficient, a target RGB value, an RGB color mixing standard ratio, and the rated maximum luminous flux.
  • the RGB light device may be configured to determine a PWM duty ratio of the red light R (PWM%) according to a formula
  • the RGB light device may be configured to determine a PWM duty ratio of the green light G (PWM%) according to a formula
  • the RGB light device may be configured to determine a PWM duty ratio of the blue light B (PWM%) according to a formula
  • Rin is a target RGB value of the red monochromatic light
  • Gin is a target RGB value of the green monochromatic light
  • Bin is a target RGB value of the blue monochromatic light.
  • ⁇ (Rb) is a luminous flux of the red monochromatic light under a color mixing standard ratio
  • ⁇ (G b) is a luminous flux of the green monochromatic light under the color mixing standard ratio
  • ⁇ (B b) is a luminous flux of the blue monochromatic light under the color mixing standard ratio.
  • Sr, Sg, and Sb depending on the color mixing standard ratio.
  • the above formulae may be only specific implementation manners, and the embodiments may be not limited thereto.
  • the above formulae can be modified, and the PWM duty ratio of the three-color light may be determined according to the modified formulae. That is, the specific manner for the PWM duty ratio of the three-color light is not limited to the disclosed embodiments, as long as the RGB light device may determine the PWM duty ratio of the three-color light according to the luminous flux calibration coefficient, the target RGB value, the RGB color mixing standard ratio, and the rated maximum luminous flux.
  • the methods may be implemented by the color calibration system for the RGB light device as described in the above embodiments, and the implementation principles and technical effects thereof are similar. The details are not repeated herein.

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