WO2020236525A1 - Modalité de commande d'utilisateur pour le réglage de couleur de del - Google Patents

Modalité de commande d'utilisateur pour le réglage de couleur de del Download PDF

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Publication number
WO2020236525A1
WO2020236525A1 PCT/US2020/032948 US2020032948W WO2020236525A1 WO 2020236525 A1 WO2020236525 A1 WO 2020236525A1 US 2020032948 W US2020032948 W US 2020032948W WO 2020236525 A1 WO2020236525 A1 WO 2020236525A1
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WIPO (PCT)
Prior art keywords
led
control device
flux
cct
leds
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Application number
PCT/US2020/032948
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English (en)
Inventor
Yifeng QIU
Johannes Willem Herman Sillevis Smitt
Original Assignee
Lumileds Llc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US16/457,130 external-priority patent/US11076461B2/en
Application filed by Lumileds Llc filed Critical Lumileds Llc
Priority to CN202080051544.4A priority Critical patent/CN114128403A/zh
Publication of WO2020236525A1 publication Critical patent/WO2020236525A1/fr

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Classifications

    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/155—Coordinated control of two or more light sources

Definitions

  • serial number 16/454,730 filed 27 June 2019, and entitled“DIM-TO-WARM LED CIRCUIT”
  • serial number 16/403,265 filed 3 May 2019, and entitled “SELECTING PARAMETERS IN A COLOR-TUNING
  • the subject matter disclosed herein relates to color tuning of one or more light-emitting diodes (LEDs) or LED arrays that comprise a lamp operating substantially in the visible portion of the LEDs
  • the disclosed subject matter relates to a technique to enable two color-tuning devices and a luminous-flux device to control two parameters of color temperature and a brightness level of the LED arrays.
  • LEDs Light-emitting diodes
  • SPD spectral power density
  • the SPD is the relative intensity for various wavelengths within the visible light spectrum.
  • CCT correlated color temperature
  • BBL black-body line
  • BBL black-body line
  • a first technology is based on white LEDs of two or more CCTs.
  • the second technology is based on a combination of Red/Green/Blue/ Amber colors.
  • the first technology simply does not have a capabihty to tune LEDs in the O U v direction.
  • the color tuning capability is seldom offered as an available function.
  • the user is instead usually offered a color wheel based on either Red-Green-Blue (RGB) or Hue- Saturation-Lightness (HSL) models.
  • RGB Red-Green-Blue
  • HSL Hue- Saturation-Lightness
  • the RGB and HSL models were not designed for general illumination. Both the RGB and HSL model are more appropriate for graphics or photographic applications.
  • FIG. 1 shows a portion of an International Commission on
  • CIE Illumination
  • BBL black body line
  • FIG. 2A shows a chromaticity diagram with approximate chromaticity coordinates of colors for typical red (R), green (G), and blue (B) LEDs, on the diagram, and including a BBL;
  • FIG. 2B shows a revised version of the chromaticity diagram of FIG. 2 A, with approximate chromaticity coordinates for
  • FIG. 2C shows a revised version of the chromaticity diagram of FIG. 2A, with approximate chromaticity coordinates for desaturated R, G, and B LEDs in proximity to the BBL, the
  • FIG. 3 shows a color-tuning device of the prior art requiring a separate flux control-device and a separate CCT control-device;
  • FIG. 4 shows another color-tuning device of the prior art using a single control-device that controls both color temperature and intensity of the LEDs
  • FIG. 5 shows an example of a high-level schematic diagram of the color-tuning and luminous-flux control devices, a controller box, and a desaturated LED array comprising, for example, the desaturated LEDs of FIGS. 2B and 2C, in accordance with various embodiments of the disclosed subject matter;
  • FIG. 6 shows an exemplary embodiment of the color-tuning and luminous-flux control devices of FIG. 5 implemented on a display screen, in accordance with various exemplary embodiments of the disclosed subject matter.
  • FIG. 7 shows an exemplary method to set the parameters of CCT, Ouv, and luminous flux for the LED array.
  • first element may be termed a second element and a second element may be termed a first element without departing from the scope of the disclosed subject matter.
  • second element may be termed a first element without departing from the scope of the disclosed subject matter.
  • the term “and/or” may include any and all combinations of one or more of the associated listed items.
  • LEDs Semiconductor-based light-emitting devices or optical power-emitting-devices, such as devices that emit ultraviolet (UV) or infrared (JR) optical power, are among the most efficient hght sources currently available. These devices may include light-emitting diodes, resonant-cavity light emitting diodes, vertical-cavity laser diodes, edge-emitting lasers, or the like (simply referred to herein as LEDs). Due to their compact size and low power requirements, LEDs may be attractive candidates for many different applications.
  • UV ultraviolet
  • JR infrared
  • LEDs may be used as light sources (e.g., flash lights and camera flashes) for hand-held battery-powered devices, such as cameras and cellular phones.
  • LEDs may also be used, for example, for automotive lighting, heads-up display (HUD) hghting, horticultural lighting, street hghting, a torch for video, general illumination (e.g., home, shop, office and studio hghting, theater /stage hghting, and
  • HUD heads-up display
  • a single LED may provide light that is less bright than an
  • incandescent light source and, therefore, multi-junction devices or arrays of LEDs (such as monolithic LED arrays, micro LED arrays, etc.) may be used for applications where enhanced brightness is desired or required.
  • LEDs such as monolithic LED arrays, micro LED arrays, etc.
  • LED-based lamps or related ihumination devices
  • a relative brightness e.g., luminous flux
  • Such environments may include, for example, retail locations as well as hospitality locations such as restaurants and the like.
  • another lamp metric is the color-rendering index (CRI) of the lamp.
  • CRI is defined by the International Commission on Illumination (CIE) and provides a quantitative measure of an ability of any light source (including LEDs) to accurately represent colors in various objects in comparison with an ideal, or natural-light source.
  • the highest possible CRI value is 100.
  • Another quantitative lamp metric is D u v .
  • the D u v is a metric defined in, for example, CIE 1960, to represent the distance of a color point to the BBL. It is a positive value if the color point is above the BBL and a negative value if the color point is below the BBL. Color points above the BBL appear greenish in color and those below the BBL appear pinkish in color.
  • the disclosed subject matter provides an apparatus to control both a color temperature (CCT and Dm ) as well as a brightness level of the lamp.
  • the color temperature is related to both CCT and D u v in color-tuning applications.
  • the disclosed subject matter is therefore directed to a color tuning (covering both CCT and D Uv ) and luminous flux (e.g., “brightness level”) scheme for driving various colors of LEDs including, for example, primary color (Red-Green-Blue or RGB) LEDs, or desaturated (pastel) RGB color LEDs, to make light of various color temperatures with a high color-rendering index (CRI) and high efficiency, specifically addressing color mixing using phosphor- converted color LEDs.
  • a color tuning covering both CCT and D Uv
  • luminous flux e.g., “brightness level”
  • dimming an LED can be achieved by, for example, reducing the forward current transferred to the LED.
  • a controller box (described in detail with reference to FIG. 5, below) may rapidly switch selected ones of the LEDs between“on” and“off’ states to achieve an appropriate level of dimming and color temperature for the selected lamp.
  • LED drive circuits are formed using either an analog-driver approach or a pulse-width modulation (PWM)-driver approach.
  • PWM pulse-width modulation
  • an analog driver approach all colors are driven simultaneously. Each LED is driven independently by providing a different current for each LED.
  • the analog driver results in a color shift and currently there is not a way to shift current three ways. Analog driving often results in certain colors of LEDs being driven into low current mode and other times, into very high current mode. Such a wide dynamic range imposes a challenge on sensing and control hardware.
  • each color is switched on, in sequence, at high speed.
  • Each color is driven with the same current.
  • the mixed color is controlled by changing the duty cycle of each color. That is, one color can be driven for twice as long as another color to add into the mixed color. As human vision is unable to perceive very fast changing colors, the light appears to have one single color.
  • a second LED (of a second color) is driven periodically with the same current for a predetermined amount of time
  • a third LED of a third color is driven periodically with the current for a
  • each of the three predetermined amounts of time may be the same amount of time or different amounts of time.
  • the mixed color is therefore controlled by changing the duty cycle of each color. For example, if you have an RGB LED and desire a specific output, red may be driven for a portion of the cycle, green for a different portion of the cycle, and blue is driven for yet another portion of the cycle based on the perception of the human eye. Instead of driving the red LED at a lower current, it is driven at the same current for a shorter time. This example demonstrates the downside of PWM with the LEDs being poorly utilized, therefore leading to an inefficient use of power.
  • the current is supplied from a voltage-controlled current source.
  • Another advantage of the disclosed subject matter over the prior art is that the desaturated RGB approach can create tunable light on and off the BBL, as well as on the BBL, for example, an isothermal CCT line (as described below) while maintaining a high CRI.
  • Various other prior art systems in comparison, utihze a CCT approach where tunable color-points fall on a straight line between two primary colors of LEDs (e.g., R-G, R-B, or G-B).
  • FIG. 1 shows a portion of an International Commission on Illumination (CIE) color chart 100, including a black body line (BBL) 101 (also referred to as a Planckian locus) that forms a basis for understanding various embodiments of the subject matter disclosed herein.
  • the BBL 101 shows the chromaticity coordinates for blackbody radiators of varying temperatures. It is generally agreed that, in most illumination situations, light sources should have chromaticity coordinates that he on or near the BBL 101.
  • Various mathematical procedures known in the art are used to determine the “closest” blackbody radiator. As noted above, this common lamp specification parameter is called the correlated color temperature (CCT).
  • CCT correlated color temperature
  • D u v value is an indication of the degree to which a lamp’s chromaticity coordinate lies above the BBL 101 (a positive D u v value) or below the BBL 101 (a negative D u v value).
  • the portion of the color chart is shown to include a number of isothermal lines 117. Even though each of these lines is not on the BBL 101, any color point on the isothermal hne 117 has a constant CCT.
  • a first isothermal line 117A has a CCT of 10,000 K
  • a second isothermal line 117B has a CCT of 5,000 K
  • a third isothermal hne 117C has a CCT of 3,000 K
  • a fourth isothermal hne 117D has a CCT of 2,200 K.
  • the CIE color chart 100 also shows a number of ellipses that represent a Macadam Ellipse (MAE) 103, which is centered on the BBL 101 and extends one step 105, three steps 107, hve steps 109, or seven steps 111 in distance from the BBL 101.
  • the MAE is based on psychometric studies and defines a region on the CIE chromaticity diagram that contains all colors which are indistinguishable, to a typical observer, from a color at the center of the ellipse.
  • each of the MAE steps 105 to 111 (one step to seven steps) are seen to a typical observer as being substantially the same color as a color at the center of a respective one of the MAEs 103.
  • a series of curves, 115A, 115B, 115C, and 115D represent substantially equal distances from the BBL 101 and are related to D u u values of, for example, +0.006, +0.003, 0, - 0.003 and - 0.006, respectively.
  • FIG. 2A shows a chromaticity diagram 200 with approximate chromaticity coordinates of colors for typical coordinate values (as noted on the x-y scale of the chromaticity diagram 200) for a red (R) LED at coordinate 205, a green (G) LED at coordinate 201, and a blue (B) LED at coordinate 203.
  • FIG. 2A shows an example of the chromaticity diagram 200 for defining the wavelength spectrum of a visible light source, in accordance with some embodiments.
  • the chromaticity diagram 200 of FIG. 2A is only one way of defining a wavelength spectrum of a visible light source; other suitable definitions are known in the art and can also be used with the various embodiments of the disclosed subject matter described herein.
  • a convenient way to specify a portion of the chromaticity diagram 200 is through a collection of equations in the x-y plane, where each equation has a locus of solutions that defines a line on the chromaticity diagram 200.
  • the lines may intersect to specify a particular area, as described below in more detail with reference to FIG. 2B.
  • the white light source can emit light that corresponds to hght from a blackbody source operating at a given color temperature.
  • the chromaticity diagram 200 also shows the BBL 101 as described above with reference to FIG. 1.
  • Each of the three LED coordinate locations 201, 203, 205 are the CCT coordinates for“fully- saturated” LEDs of the respective colors green, blue, and red.
  • FIG. 2B shows a revised version of the chromaticity diagram 200 of FIG. 2A, with approximate chromaticity coordinates for desaturated R, G, and B LEDs in proximity to the BBL, the
  • the chromaticity diagram 250 of FIG. 2B shows approximate chromaticity coordinates for desaturated (pastel) R, G, and B LEDs in proximity to the BBL 101. Coordinate values (as noted on the x-y scale of the chromaticity diagram 250) are shown for a desaturated red (R) LED at coordinate 255, a desaturated green (G) LED at coordinate 253, and a desaturated blue (B) LED at coordinate 251.
  • R red
  • G desaturated green
  • B desaturated blue
  • a color temperature range of the desaturated R, G, and B LEDs may be in a range from about 1800 K to about 2500 K.
  • the desaturated R, G, and B LEDs may be in a color temperature range of, for example, about 2700 K to about 6500 K. In still other embodiments, the desaturated R, G, and B LEDs may be in a color temperature range of about 1800 K to about 7500 K. In still other embodiments, the desaturated R, G, and B LEDs may be selected to be in a wide range of color temperatures.
  • the color rendering index (CRI) of a light source does not indicate the apparent color of the light source; that information is given by the correlated color temperature (CCT). The CRI is therefore a quantitative measure of the ability of a light source to reveal the colors of various objects faithfully in comparison with an ideal or natural-light source.
  • a triangle 257 formed between each of the coordinate values for the desaturated R, G, and B LEDs is also shown.
  • the desaturated R, G, and B LEDs are formed (e.g., by a mixture of phosphors and/or a mixture of materials to form the LEDs as is known in the art) to have coordinate values in proximity to the BBL 101. Consequently, the coordinate locations of the respective desaturated R, G, and B LEDs, and as outlined by the triangle 257, has a CRI have approximately 90 or greater and an approximate tunable color-temperature-range of, for example, about 2700 K to about 6500 K.
  • a correlated color temperature may be selected in the color-tuning application described herein such that all combinations of CCT selected all result in the lamp having a CRI of 90 or greater.
  • Each of the desaturated R, G, and B LEDs may comprise a single LED or an array (or group) of LEDs, with each LED within the array or group having a desaturated color the same as or similar to the other LEDs within the array or group.
  • a combination of the one or more desaturated R, G, and B LEDs comprises a lamp.
  • FIG. 2C shows a revised version of the chromaticity diagram 200 of FIG. 2A, with approximate chromaticity coordinates for desaturated R, G, and B LEDs in proximity to the BBL, the
  • desaturated R, G, and B LEDs having a color-rendering index (CRI) of approximately 80+ and within a defined color temperature range that is broader than the desaturated R, G, and B LEDs of FIG. 2B, in accordance with various embodiments of the disclosed subject matter.
  • CRI color-rendering index
  • the chromaticity diagram 270 of FIG. 2C shows approximate chromaticity coordinates for desaturated R, G, and B LEDs that are arranged farther from the BBL 101 than the
  • a color temperature range of the desaturated R, G, and B LEDs may be in a range from about 1800 K to about 2500 K.
  • the desaturated R, G, and B LEDs may be in a color temperature range of about 2700 K to about 6500 K.
  • the desaturated R, G, and B LEDs may be in a color temperature range of about 1800 K to about 7500 K.
  • a triangle 277 formed between each of the coordinate values for the desaturated R, G, and B LEDs is also shown.
  • the desaturated R, G, and B LEDs are formed (e.g., by a mixture of phosphors and/or a mixture of materials to form the LEDs as is known in the art) to have coordinate values in proximity to the BBL 101. Consequently, the coordinate locations of the respective desaturated R, G, and B LEDs, and as outlined by the triangle 277, has a CRI have approximately 80 or greater and an approximate tunable color-temperature-range of, for example, about 1800 K to about 7500 K. Since the color temperature range is greater than the range shown in FIG.
  • the CRI is commensurately decreased to about 80 or greater.
  • the desaturated R, G, and B LEDs may be produced to have individual color temperatures anywhere within the chromaticity diagram. Therefore, the selection of a correlated color temperature (CCT) may be selected in the color-tuning application described herein such that all combinations of CCT selected all result in the lamp having a CRI of 80 or greater.
  • CCT correlated color temperature
  • Each of the desaturated R, G, and B LEDs may comprise a single LED or an array (or group) of LEDs, with each LED within the array or group having a desaturated color the same as or similar to the other LEDs within the array or group. A combination of the one or more
  • desaturated R, G, and B LEDs comprises a lamp.
  • FIG. 3 shows a color-tuning device 300 of the prior art requiring a separate flux-control device 301 and a separate CCT- control device 303.
  • the flux-control device 301 is coupled to a single channel driver circuit 305 and the CCT-control device is coupled to a combination LED-driving circuit/LED array 320.
  • the combination LED-driving circuit/LED array 320 may be a current- driver circuit, a PWM driver circuit, or a hybrid current- driver/PWM- driver circuit.
  • Each of the flux-control device 301, the CCT-control device 303, and the single-channel driver circuit 305 is located in a customer facility 310 and all devices must be installed with applicable national and local rules governing high-voltage circuits.
  • the combination LED- driving circuit/LED array 320 is generally located remotely from the customer facility 310. Consequently, both the initial purchase price and the installation price may be significant.
  • FIG. 4 shows a color-tuning device 400 of the prior art that uses a single control-device 401.
  • the single control- device 401 is coupled to a single-channel driver circuit 403, both of which are within a customer installation-area 410.
  • the single-channel driver circuit 403 is coupled to a combination LED-driving circuit/LED array 420.
  • the combination LED-driving circuit/LED array 420 is generally located remotely from the customer installation-area 410 (but generally still within a customer facility).
  • the color-tuning device 400 uses a single device to control both luminous flux (and luminous intensity) and color temperature. As the luminous flux (intensity) of the LED array is decreased, the color temperature of the LED array is also reduced.
  • FIG. 5 an example of a high-level schematic diagram 500 of the color-tuning and luminous-flux control devices 550, a controller box 530, a number of control switches 520 (e.g., a multiplexer array), and a desaturated LED array 510 comprising, for example, the desaturated LEDs of FIGS. 2B and 2C, in accordance with various embodiments of the disclosed subject matter, is shown.
  • the LED array 510 is shown to include desaturated LEDs e.g., (an“R” LED 511, a“G” LED 513, and a“B” LED 515), although the high-level schematic diagram 500 is not necessarily limited to these colors only. Rather, these colors are presented for ease in understanding the various novel features of the disclosed subject matter.
  • The“R” LED 511, the“G” LED 513, and the“B” LED 515 comprise the LED array 510 (e.g., a lamp).
  • each of the“R” LED 511, the“G” LED 513, and the“B” LED 515 may be comprised of one or more LEDs of the appropriate desaturated color (e.g., R, G, or B). Since the LED array 510 comprises, for example, the“R” LED 511, a“G” LED 513, and a“B” LED 515 colors, the LED array 510 may be considered to be a multi-colored LED array.
  • the controller box 530 reads converted signals (e.g., from an analog signal to a digital signal through an analog-to-digital converter 531 (A/D converter or ADC)) transferred from the color-tuning and luminous- flux control devices 550 and send a pre-determined amount of current to one, two, or all three of the LEDs to change an overall CCT and/or Duv level of the LED array 510.
  • converted signals e.g., from an analog signal to a digital signal through an analog-to-digital converter 531 (A/D converter or ADC)
  • the controller box 530 may rapidly switch selected ones of the LEDs between“on” and“off’ states to achieve an appropriate level of dimming for the selected lamp in accordance with intensities desired as indicated by an end-user in setting a level of desired brightness on the flux-control device 555.
  • the controller box 530 may be a three-channel converter, known in the art.
  • the color-tuning and luminous-flux control devices 550 include three separate devices (although physically they may be grouped onto a single device) including a CCT-control device 551, a Decontrol device 553, and a flux-control device 555.
  • One or more of the three devices may comprise an electrical control-device, a mechanical control- device, or a software control- device (described in more detail with reference to FIG. 6).
  • the control devices may be based on analog or digital signals. If one or more of the devices is based on an analog output, the controller box 530 includes the analog- to-digital converter (ADC) 531.
  • ADC analog- to-digital converter
  • one or more of the control devices may comprise a voltage divider.
  • one or more of the control devices comprises various types of capacitively or resistively coupled current or voltage output devices known in the art. All three devices may comprise the same type of control device or various types of control devices.
  • one or more of the CCT-control device 551, the Decontrol device 553, and the flux-control device 555 may be a 0 volt to 10 volt dimmer device that is adapted to function as a one-dimensional control.
  • the O-to-lO volt dimmer device is traditionally used for flux dimming.
  • a position of, for example, a rotary or linear potentiometer or rheostat, can be used to output a signal within the O-to-10 volt range, inclusively.
  • each of the CCT-control device 551, the Dministerr -control device 553, and the flux-control device 555 can be of electrically-based or mechanically-based.
  • the devices can be analog or digital. In some embodiments, the devices can be realized by physical knobs, dials, shders, wheels, dipswitches, and/or or their various equivalents.
  • the CCT-control device 551, the Decontrol device 553, and the flux-control device 555 can be implemented as, for example, a resistive/capacitive touch panel and with or without an integrated display. This embodiment is described in more detail with reference to FIG. 6, below.
  • An algorithm may be used to accept the output signal (e.g., in analog or digital form) and translate the output signal to one of the three control signals.
  • the algorithm may correlate a 9.7 V output signal from the CCT-control device 551 to a color
  • the algorithm may correlate a 4.0 V output signal from the Decontrol device 553 to a negative value of D Uv of -0.003, or slightly below the BBL 101 of FIG. 1, along the iso-CCT hne of 6350 K to a slightly pinkish value as discussed above.
  • the controller box 530 again sends signals to turn various ones of the control switches 520“on” or“off’ in rapid succession so that a human observer perceives the LED array 510 as emitting a color temperature of 6350 K, but now with a slightly pinkish cast.
  • the controller box 530 then continues to send signals to turn the control switches 520“on” and“off’ to achieve the color
  • the algorithm determines each of the CCT-control device 551, the Decontrol device 553, and the flux-control device 555 in a monotonic relationship (a one-to-one correspondence) with their respective algorithmic output values.
  • an output signal may be correlated to a lookup table (LUT) to translate the output signal to one of the three control signals.
  • the controller box 530 may be used to accept and read the output signal (e.g., in analog or digital form) and translate the output signal to one of the three control signals.
  • the controller box 530 receives a 3.5 V output signal from the CCT-control device 551.
  • the LUT indicates that the 3.5 V output signal corresponds to a color temperature for the LED array 510 of 3400 K.
  • the controller box 530 then sends signals to turn various ones of the control switches 520“on” or“off’ in rapid succession so that a human observer perceives the LED array 510 as emitting a color temperature of 3400 K (e.g., a mixture of primarily green light and red light).
  • a color temperature of 3400 K e.g., a mixture of primarily green light and red light.
  • an output signal from the Decontrol device 553 of, for example, 8.5 V may correlate to a positive value of O Uv of +0.006 in the LUT.
  • the correlated O Uv value of +0.006 is slightly above the BBL 101 of FIG.
  • the controller box 530 again sends signals to turn various ones of the control switches 520 “on” or“off’ in rapid succession so that a human observer perceives the LED array 510 as emitting a color temperature of 3400 K, but now with a slightly greenish cast.
  • the LUT may correlate a 10.0 V output signal from the flux-control device 555 to an intensity level for the LED array 510 to have an intensity level of 100% of full brightness.
  • the controller box 530 continues to send signals to turn the control switches 520“on” and“off’ to achieve the color
  • the lookup table is arranged to determine each of the CCT-control device 551, the Decontrol device 553, and the flux- control device 555 in a monotonic relationship (a one-to-one correspondence) with their respective LUT output values.
  • each of the signals received and read from the CCT-control device 551, the Decontrol device 553, and the flux-control device 555 function in a similar manner as described above with reference to the algorithm
  • the lookup table embodiment receives the voltage signal, and then consults a LUT for a
  • the algorithm embodiment and the LUT embodiment may be used concurrently.
  • output signals from the CCT- control device 551 and the D, « -control device 553 may function and be correlated under the algorithm embodiment while out signals from the flux-control device 555 may function and be correlated under the LUT embodiment.
  • embodiments may be performed with, for example, one or more microcontrollers (not shown) or other device types described below (e.g., hardware, firmware, and/or software devices).
  • the various device types can be defined as modules.
  • the one or more microcontrollers of modules may be embedded within, for example, the controller box 530, or contained within each of the CCT- control device 551, the Decontrol device 553, and the flux-control device 555, or within a microcontroller placed in proximity to the control devices (e.g., adjacent to an electrical box or in a separate box adjacent to the electrical box housing the control devices a controller box 501 as described with reference to FIG. 5, below.
  • modules may be contained within the controller box 530.
  • the modules may also comprise software-based modules (e.g., code stored or otherwise embodied in a machine-readable medium or in a transmission medium), hardware modules, or any suitable combination thereof.
  • a hardware module is a tangible (e.g., non-transitory) physical component (e.g., a set of one or more microcontrollers or
  • microprocessors or other hardware-based devices capable of performing certain operations and interpreting the output signals received from the color-tuning and luminous-flux control devices 550.
  • the one or more modules may be configured or arranged in a certain physical manner. In various embodiments, one or more
  • microcontrollers or microprocessors may be configured by software (e.g., an application or portion thereof) as a hardware module that operates to perform operations described herein for that module.
  • a hardware module may be implemented, for example, mechanically or electronically, or by any suitable combination thereof.
  • a hardware module may include dedicated circuitry or logic that is permanently configured to perform certain operations.
  • a hardware module may be or include a special-purpose processor, such as a field-programmable gate array (FPGA) or an application specific integrated circuit (ASIC).
  • a hardware module may also include programmable logic or circuitry that is temporarily configured by software to perform certain operations, such as an interpretation the output signals received from the color-tuning and luminous-flux control devices 550 to particular CCT, Ouv, or flux values, either through an algorithm or the LUT described above.
  • a hardware module may include software encompassed within a CPU or other programmable processor. It will be appreciated that the decision to implement a hardware module mechanically, electrically, in dedicated and permanently configured circuitry, or in temporarily configured circuitry (e.g., configured by software) may be driven by cost and time considerations.
  • the controller box 530 may comprise a hybrid LED driving-circuit for CCT and D u v tuning.
  • the hybrid driving-circuit can include an LED driver to produce a stabilized LED-driver current. Consequently, the hybrid driving- circuit provides current to at least two of the“R” LED 511, the“G” LED 513, and the“B” LED 515 that comprise the LED array 510.
  • the control switches 520 delivers the current to the appropriate LEDs based on, for example, the desired CCT and D u v tuning.
  • the hybrid driving-circuit within the controller box 530 may then be overlaid with PWM time-slicing directing current to at least two of the“R” LED 511, the“G” LED 513, and the “B” LED 515 that comprise the LED array 510.
  • the controller box 530 and/or the microcontroller (or other modules) described above can be configured to have a special calibration mode.
  • the calibration mode can function with either the algorithm (although the user may need access to the underlying software or firmware to change values) or values in the LUT.
  • the controller box 530 can enter the calibration mode if it is power cycled in a special sequence (e.g., a combination of long and short power-up/down cycles). While in this calibration mode, the user (e.g., a calibrating technician at the factory or an advanced end-user) is asked to change the correlation values of the output signals of the three control devices to their respective controlled- values (CCT, O Uv , and flux).
  • a special sequence e.g., a combination of long and short power-up/down cycles
  • the controller box 530 then stores these two algorithms or values in, for example, software in an internal memory or firmware (e.g., an EEPROM), or hardware (e.g., a Field Programmable Gate Array (FPGA)).
  • the internal memory can take a number of forms including, for example, electrically erasable programmable read-only memory (EEPROM), phase-change memory (PCM), flash memory, or various other types of non-volatile memory devices known in the art.
  • FIG. 6 shows an exemplary embodiment of the color-tuning and luminous-flux control devices 550 of FIG. 5 implemented on a display screen 600, in accordance with various exemplary
  • the display screen 600 shows a first channel 610 to control the O Uv distance from the BBL (see, e.g., FIG. 1) of the LED array 510, a second channel 620 to control the CCT of the LED array 510, and a third channel 630 to control the luminous flux (intensity) of the LED array 510.
  • Each of the channels may be separate portions of the same display screen 600 or may comprise three separate portions, which when combined, comprise the display screen 600.
  • the first channel 610 includes a first button 611 to lower the value of the O Uv distance from the BBL and a second button 613 to increase the O Uv distance from the BBL to control the O Uv portion of the color-tuning of the LED array 510.
  • the value chosen for O Uv may then be displayed on a D w-display portion 615.
  • the second channel 620 includes a first button 621 to lower the value of the CCT and a second button 623 to increase the value of CCT chosen to control the CCT portion of the LED array 510.
  • the value chosen for the CCT may then be displayed on a CCT-display portion 625 of the display screen 600.
  • the third channel 630 includes a first button 631 to lower the value of the luminous flux (intensity or brightness level of the LED array 510) and a second button 633 to increase the value of the luminous flux of the LED array 510.
  • the value chosen for the luminous flux may then be displayed on a luminous -flux- display portion 635 of the display screen 600.
  • buttons 611, 613, 621, 623, 631, 633 may comprise“soft buttons,” implemented on, for example, a touch-sensitive version of the display screen 600.
  • some or all of the buttons 611, 613, 621, 623, 631, 633 may comprise hardware-implemented buttons (e.g., a momentary- contact switch or other type of hardware-based switch) formed in the display screen 600.
  • some or all of the buttons 611, 613, 621, 623, 631, 633 may comprise hardware-implemented buttons that are, for example, capacitively -based portions of the display screen 600.
  • a combination of button types may be used.
  • FIG. 7 an exemplary method to set the parameters of CCT, O Uv , and luminous flux for the LED array 510 of FIG. 5 is shown.
  • the method begins at operation 701, where the initial values of parameter settings (CCT, O Uv , and flux) are started (or updated, depending upon whether any values from the one or more of the CCT-control device 551, the Decontrol device 553, and the flux-control device 555 have already been set).
  • Each of the three parameters that can be set for the LED array 510 includes a separate branch.
  • a CCT branch 710 receives and reads input signals related to setting the CCT for the LED array 510 and correlates the CCT signals to instructions for the controller box 530.
  • a O Uv branch 720 receives and reads input signals related to setting the O Uv for the LED array 510 and correlates the O Uv signals to instructions for the controller box 530.
  • a flux branch 730 receives and reads input signals related to setting the flux for the LED array 510 and correlates the received flux signals to instructions for the controller box 530.
  • a CCT-output signal is received and read from, for example, the CCT- control device 551 ( see FIG. 5) or the second channel 620 of the display screen 600 ( see FIG. 6).
  • the received CCT- output signal is correlated to a desired color temperature indicative of the setting from the CCT-control device 551 or the second channel 620.
  • the correlation may occur by providing a value of the CCT-output signal as an input to the CCT signal-to-color temperature algorithm.
  • the correlation may occur by providing a value of the CCT-output signal as an input to a lookup table.
  • the correlated output value from the algorithm or the LUT is then sent as a signal (e.g., analog or digital) to the controller box 530, at operation 707.
  • the signal is interpreted in the controller box 530, at operation 721, to send appropriate current levels and/or PWM signals, substantially simultaneously, to at least two of the three colors in the LED arrays 510 based on the received CCT-output signal.
  • a Dm -output signal is received and read from, for example, the De control device 553 ( see FIG. 5) or the first channel 610 of the display screen 600 ( see FIG. 6).
  • the received De-output signal is correlated to a desired De value that is indicative of the setting from the De-control device 553 or the first channel 610.
  • the correlation may occur by providing a value of the De-output signal as an input to an algorithm structures to relate the De signal-to-De distance from the BBL.
  • the correlation may occur by providing a value of the Duv-output signal as an input to a lookup table.
  • the correlated output value from the algorithm or the LUT is then sent as a signal (e.g., analog or digital) to the controller box 530, at operation 713.
  • the signal is interpreted in the controller box 530, at operation 721, to send appropriate current levels and/or PWM signals, substantially simultaneously, to at least two of the three colors in the LED arrays 510 based on the received D w-output signal.
  • a flux-output signal is received and read from, for example, the flux- control device 565 ( see FIG. 5) or the third channel 630 of the display screen 600 ( see FIG. 6).
  • the received flux-output signal is correlated to a desired luminous-flux level indicative of the setting from the flux-control device 565 or the third channel 630.
  • the correlation may occur by providing a value of the flux-output signal as an input to the luminous-flux signal-to-flux intensity algorithm.
  • the correlation may occur by providing a value of the flux-output signal as an input to a lookup table.
  • the correlated output value from the algorithm or the LUT is then sent as a signal (e.g., analog or digital) to the controller box 530, at operation 719.
  • the signal is interpreted in the controller box 530, at operation 721, to send appropriate current levels and/or PWM signals, substantially simultaneously, to at least two of the three colors in the LED arrays 510 based on the received flux-output signal.
  • the method checks (e.g., polls) for any new/revised signals from the color-tuning and luminous-flux control devices 550 or the display screen 600. If one or more new signals is sensed at operation 725, the method starts again at operation 701.
  • many of the components described may comprise one or more modules configured to implement the functions disclosed herein.
  • the modules may constitute software modules (e.g., code stored on or otherwise embodied in a machine-readable medium or in a transmission medium), hardware modules, or any suitable combination thereof.
  • a “hardware module” is a tangible (e.g., non-transitory) physical component (e.g., a set of one or more microprocessors or other hardware-based devices) capable of performing certain operations and interpreting certain signals.
  • the one or more modules may be configured or arranged in a certain physical manner.
  • one or more microprocessors or one or more hardware modules thereof may be configured by software (e.g., an application or portion thereof) as a hardware module that operates to perform operations described herein for that module.
  • a hardware module may be implemented, for example, mechanically or electronically, or by any suitable combination thereof.
  • a hardware module may include dedicated circuitry or logic that is permanently configured to perform certain operations.
  • a hardware module may be or include a special-purpose processor, such as a field-programmable gate array (FPGA) or an application specific integrated circuit (ASIC).
  • FPGA field-programmable gate array
  • ASIC application specific integrated circuit
  • a hardware module may also include programmable logic or circuitry that is temporarily configured by software to perform certain operations, such as interpretation of the various states and
  • a hardware module may include software encompassed within a CPU or other programmable processor. It will be appreciated that the decision to implement a hardware module mechanically, electrically, in dedicated and permanently configured circuitry, or in temporarily configured circuitry (e.g., configured by software) may be driven by cost and time considerations.
  • the term“or” may be construed in an inclusive or exclusive sense. Further, other embodiments will be understood by a person of ordinary skill in the art upon reading and understanding the disclosure provided. Further, upon reading and understanding the disclosure provided herein, the person of ordinary skill in the art will readily understand that various combinations of the techniques and examples provided herein may all be applied in various combinations.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

La présente invention concerne divers modes de réalisation qui comprennent des appareils et des procédés permettant à un appareil de commande de régler la couleur d'un réseau de diodes électroluminescentes (DEL). Dans un exemple, un appareil d'éclairage pouvant être commandé comprend un réseau de DEL ayant au moins une DEL rouge désaturée, au moins une DEL verte désaturée et une DEL bleue désaturée. Un certain nombre de dispositifs de commande de réglage de la couleur et de réglage du flux lumineux comprennent un dispositif de commande de température de la couleur corrélée réglable (CCT) pour régler une température de la couleur souhaitée du réseau de DEL, un dispositif de commande Duv réglable pour régler une dominante de couleur globale souhaitée du réseau de DEL le long d'une ligne CCT isotherme correspondant à la température de la couleur souhaitée et un dispositif de commande du flux réglable pour régler une valeur du flux lumineux souhaitée du réseau de DEL. L'invention concerne d'autres appareils et procédés.
PCT/US2020/032948 2019-05-17 2020-05-14 Modalité de commande d'utilisateur pour le réglage de couleur de del WO2020236525A1 (fr)

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US201962849229P 2019-05-17 2019-05-17
US62/849,229 2019-05-17
US16/457,130 US11076461B2 (en) 2019-05-17 2019-06-28 User control modality for LED color tuning
US16/457,130 2019-06-28
EP19205102 2019-10-24
EP19205102.7 2019-10-24

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CN115334710B (zh) * 2022-08-12 2023-03-31 杭州罗莱迪思科技股份有限公司 等温线调色控制方法及其应用

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