TW201230873A - Systems and methods for controlling solid state lighting devices and lighting apparatus incorporating such systems and/or methods - Google Patents

Abstract

A solid state lighting apparatus includes a first plurality of light emitting devices configured to emit light when energized having a first chromaticity, a second plurality of light emitting devices configured to emit light when energized having a second chromaticity, different from the first chromaticity, and a controller configured to control a duty cycle of current supplied to the first plurality of light emitting devices. The controller is configured to control the duty cycle of the first plurality of light emitting devices in response to a change in a plurality of operating conditions of the solid state lighting apparatus in accordance with a model of the duty cycle that relates the duty cycle of the first plurality of light emitting devices to the plurality of operating conditions of the solid state lighting apparatus for a target light output characteristic of the solid state lighting apparatus. Related methods are also disclosed.

Description

201230873 VI. OBJECTS OF THE INVENTION: FIELD OF THE INVENTION The present invention relates to solid state lighting 'and more particularly to solid state lighting systems comprising a plurality of solid state lighting devices' and methods of operating solid state lighting systems comprising a plurality of solid state lighting devices . The present application claims priority to U.S. Provisional Patent Application Serial No. 61/408,860, the entire disclosure of which is incorporated herein in Its whole. [Prior Art] Solid state light emitting arrays are used in many lighting applications. For example, solid state light emitting panel examples comprising arrays of solid state light emitting devices have been used as direct light sources, as in architectural and/or glare lighting. A solid state light emitting device can comprise, for example, a packaged light emitting device comprising one or more light emitting diodes (LEDs). Inorganic LEDs typically comprise a semiconductor layer that forms a p-n junction. Organic led (LED), which comprises an organic light-emitting layer, is another type of solid-state light-emitting device that produces light-recombined light (ie, 'electrons and holes') in a light-emitting layer or region through a solid-state light-emitting device. . Solid-state light-emitting panels are commonly used as backlights for small liquid crystal display (LCD) screens, such as LCD display screens used in portable electronic devices. In addition, the use of solid state lighting panels as backlights for larger displays, such as LCD television displays, has received increasing attention. d. For smaller LCD screens, the backlight assembly typically utilizes a white LED illumination device that includes a blue-emitting LED that is coated with a wavelength-converting phosphor. The light-emitting body converts some of the blue light emitted by the LED to yellow. 159304.doc 201230873 Light known as light (which is a combination of blue and yellow light) can appear white for an observer. However, the white light produced by this configuration may appear white, due to the limited spectrum of light, whereby objects illuminated by illumination may not appear to have a natural color. For example, because light can have less energy in the red knives of the visible spectrum, the red color in an object may not be better illuminated by this light. As a result, the object may appear as an unnatural color when viewed under such a light source. Visible light can comprise light having many different wavelengths. The apparent color of visible light can be represented by reference to a two-dimensional chromaticity diagram, such as the 1931 International Committee of Illumination (CIE) chromaticity diagram shown in Figure 6 and 1976 CIE u, v, chromaticity diagram, 1976 CIE u' The v' chromaticity diagram is similar to the 193 1 diagram, but modified such that similar distances on the 1976 u'v' CIE chromaticity diagram represent similar perceived differences in color. These diagrams provide useful references for defining colors, such as the weighted sum of colors. In the CIE-uV chromaticity diagram, such as the 1976 CIE chromaticity diagram, the chromaticity values are plotted using the scaled u and v parameters, which take into account differences in human visual perception. That is, the human visual system is more responsive to certain wavelengths than other wavelengths. For example, the human visual system is more responsive to green light than red light. Scale the 1976 CIE-u'v' chromaticity diagram such that the mathematical distance from one chromaticity point to another chromaticity point on the map is proportional to the color difference between the two chromaticity points perceived by one person viewer . A chromaticity diagram (where the mathematical distance from one chromaticity point to another chromaticity point on the image is proportional to the color difference between two chromaticity points perceived by one person viewer) may be referred to as a perceptual chromaticity space. In contrast, in a non-perceptual chromaticity diagram, such as the 193 1 CIE chromaticity diagram, the two colors that are indistinguishable from the difference can be distinguished from the 159304.doc 201230873. The two colors are separated on the map. far. The color on a 1931 CIE chromaticity diagram as shown in Figure 6 is defined by the X and y coordinates that fall within a substantially U-shaped region (i.e., chromaticity coordinates, or color points). The color on or near the outside of the area is a saturated color consisting of light having a single wavelength or a very small wavelength distribution. The color inside the area is a non-saturated color composed of a mixture of different wavelengths. White light, which can be a mixture of many different wavelengths, is generally found in the area near the center of the figure, labeled 100 in Figure 6. There are many different shades of light that can be considered "white" as evidenced by the size of the area. For example, some "white" light, such as light produced by a sodium vapor emitting device, may appear yellow in color, while other "white" light, such as light produced by some fluorescent light emitting devices, may appear more in color. blue. Light that appears substantially green is drawn in the regions 101' 102 and 103 above the white region, and the light below the white region 1 大体上 is substantially pink, purple or magenta. For example, the light drawn in the regions i 〇 4 and 105 in Fig. 6 is substantially magenta (i.e., red-purple or magenta). It is further known that binary combinations of light from two different light sources can be presented as having a different color than either of the two component colors. The color of the combined light may depend on the relative intensities of the two sources. For example, light emitted by a combination of a blue source and a red source can be purple or magenta for a viewer. Similarly, light emitted by a combination of a blue source and a yellow source can appear white to a viewer. Also shown in Fig. 6 is Planck's Execution 1〇6, which corresponds to the position of the color point of the light emitted by a black body radiator heated to a plurality of temperatures. In particular, I59304.doc 201230873 Figure 6 contains a list of temperatures along the black body locus. These temperature lists show the color path sum of the light emitted by a black body radiator heated to such temperatures. As a heated object becomes incandescent light' it first emits a reddish color, then a yellowish color, then a white color, and finally a light blue color, because the wavelength associated with the peak radiation of the blackbody radiator becomes temperature increases Gradually shorter. An illuminant that produces light on or near the black body locus may thus be described in terms of its correlated color temperature (CCT). The chromaticity of a particular source can be referred to as the "color point" of the source. For a white light source, the chromaticity can be referred to as the "white point" of the light source. As mentioned above, the white point of a white light source can fall along the Planckian trajectory. Accordingly, a white point can be identified by a correlated color temperature (CCT) of the light source. White light typically has a CCT between about 2000 K and 8000 κ. White light with one of 4000 K cct can be yellow in color, and white light with 8 〇〇〇 κ cct can present more blue in color. The color coordinates of the black body at a color temperature of between about 25 〇〇〇 and 6 〇〇〇 κ on or near the black body trajectory can produce a pleasant white light for a single viewer. The "white" light also contains light that is close to the Planckian trajectory but not directly on the Planckian trajectory. A MacAdam ellipse can be used on a 1931 CIE chromaticity diagram to identify closely related color points' such color points present the same or substantially similar colors to a single viewer. A MacAdam ellipse is centered in a two-dimensional chromaticity space, such as the 1931 CIE chromaticity diagram. A closed area of the point that covers all of the visually indistinguishable points from the center point. The point* MacAdam ellipse captures a point that is indistinguishable to a normal viewer within the seven-caliber deviation, and the ten-step MacAdam sugar circle Capture 159304.doc 201230873 Within ten standard deviations for a point that is not discernible to a normal viewer, and so on. Accordingly, light having a color point within a tenth order MacAden ellipse having a point on the Planckian trajectory can be considered to have the same color as that point on the Planckian trajectory. The Color Rendering Index (CRI) is often used to characterize the ability of a light source to accurately reproduce color in an illuminated object. In particular, CRI is a relative measure of how the color rendering properties of an illumination system compare to the color rendering properties of a blackbody radiator. If the illuminating system illuminates a set of test color hues & the same as the coordinates of the same test color illuminated by the δ black blackbody radiator, then the CRI is equal to 100. The neon has the highest CRI (1 〇〇), the incandescent lamp is relatively close (about 95)' and the luminescent luminescence is less accurate (7 〇 _85). For large scale backlighting and lighting applications, it is generally desirable to provide an illumination source that produces white light having a color rendering index such that objects illuminated by the illumination panel and/or display screens are more naturally rendered. Accordingly, the white light can be added to the modified CRI 'red light, for example, by adding a red-emitting wall and/or a red-emitting device to the device. Other illumination sources may include devices that emit red, green, and blue light. When devices that emit red, green, and blue light are simultaneously energized, depending on the relative intensities of the red, green, and blue sources, The combined light can appear white or nearly white. One difficulty with solid state lighting systems that include multiple solid state devices is that the LED process typically results in variations between individual LEDs. This variation is typically addressed by color systems or groups based on brightness and/or color points, and only LEDs having predetermined characteristics are selected for inclusion in a solid state lighting system. Led hair 159304.doc 201230873 Optical devices can use one-color LEDs, or LED groups that match from different color combinations, to achieve repeatable color points for the combined output of these LEDs. However, even with color separation systems, LED lighting systems can still experience significant variations in color points from one system to the next. A technique for tuning the color point of a luminaire and utilizing a variety of LED chromosystems is described in commonly assigned U.S. Patent Publication No. 2009/0160363, the disclosure of which is incorporated herein by reference. The '363 application describes a system in which a phosphor converted LED and a red LED are combined to provide white light. The ratio of the various mixed colors of the LEDs is set at the time of manufacture by measuring the light output and then adjusting the string current to achieve a desired color point. The current level at which the desired color point is reached is then fixed for the particular light emitting device. The LED lighting system utilizes feedback to obtain a desired color point as described in US Publication No. 2007/0115662 (Attorney Docket No. 53〇8_632) and No. 2007/0115228 (Attorney Profile Number 5308_632Ip). This is incorporated herein by reference. SUMMARY OF THE INVENTION Some embodiments provide a method of controlling a solid state light emitting device. The method includes providing a light emitting device based on a temperature of one of the at least one light emitting device of the solid state light emitting device and a level of chromaticity supplied to the light emitting device for a target chromaticity of light generated by the solid state light emitting device a first model of a time-cycle; and controlling the illumination according to a change in the temperature of the first light-emitting device and/or at least one of the current levels supplied to the at least one light-emitting device This action time cycle of the device. return

159304.doc S 201230873 measuring an actual chromaticity of light generated by the solid state light emitting device according to the active time cycle of the at least one light emitting device controlling the first model, and comparing the measured The chromaticity of the light output by the solid state lighting device and the target chromaticity of the light output by the solid state lighting device. Responding to a difference between the measured chromaticity and the target chromaticity, based on the temperature of the illuminating device and/or an adjusted target chromaticity of light generated by the solid state lighting device The current level of the light emitting device provides a second model of the active time cycle of the at least one light emitting device, and the active time cycle of the at least one light emitting device is controlled according to the second model. The first model of the active time cycle of the at least one light emitting device of the solid state light emitting device may comprise a plurality of control points of a Bezier surface, the Bessel surface of the at least one light emitting device The cycle is associated with the temperature of the light emitting device and the current level supplied to the light emitting device for the target chromaticity. A method of controlling a solid state light emitting device according to a further embodiment comprises: providing one of one of the operating parameters of the solid state lighting device based on at least one operating condition of the state light emitting device of the solid state lighting device a first model; controlling an operating parameter of the first plurality of light emitting devices in response to a change in the at least one operation f component; measuring the light output characteristic of the xenon light emitting device; and comparing the amount The measured light output characteristics are an acceptable range of light output characteristics of the solid state lighting device. Providing a difference between the measured light output characteristic and the target light output characteristic in response to the at least operating condition of the solid state lighting device for the adjusted target light output characteristic of the solid state lighting device The at least one operating condition of the second model of the operating parameter of the solid state 159304.doc 201230873 illumination device is the operating parameter of the plurality of light emitting devices. a second model; and in response to controlling the first complex based on a change in the control, the operational parameter can include an active time cycle of current supplied to the xenon illumination device in the (four) state illumination device. The at least operating conditions of the solid state light emitting device comprise a temperature of the solid state light emitting device and/or a current supplied to the at least one light emitting device of the solid state light device. The first model 该 of the operating parameter of the solid state lighting device includes a plurality of control points of a Bessel surface, and (4) the surface of the solid state illuminating device and the solid state for the target light output characteristic The at least one operating condition of the illumination device is associated. The light output characteristic can comprise a chromaticity point of light output by the solid state light emitting device and/or an intensity of light output by the solid state light emitting device. The solid-state I optical device comprises a first plurality of optical devices #, which are configured to emit light having a -th chromaticity when supplied with energy; and a second plurality of light-emitting devices, such as a group The state emits light having a second chromaticity different from the __ chromaticity when the energy is supplied, and the operational parameter may include an active time cycle of operation of the first plurality of illuminating devices. A solid state light emitting device according to some embodiments includes: a first light emitting device configured to emit light having a first chromaticity when energized; and a second light emitting device configured to emit a light different from the second chromaticity of the first chromaticity; and a controller configured to control a current level supplied to the first illuminating device. The controller can be configured to control the current level of the first s device according to a change in operating conditions of one of the solid state lighting devices according to the current level of the 159304.doc 201230873, the current level The model associates the current level of the first illuminating device with the operating condition of the solid state lighting device for the target light output characteristic of the solid state lighting device. The operating conditions of the solid state lighting device can include a temperature of the solid state lighting device and/or a current supplied to at least one of the solid state lighting devices. The current level model of the first illumination device can include one or more control points of a Bessel surface that directs the current level of the first illumination device to the target light output characteristic The operating conditions of the solid state lighting device are associated. In some embodiments, the first light emitting device and the second light emitting device can be connected in a series of strings, and the device can further include: a bypass circuit that is configured to selectively bypass the first a light emitting device; and a controller coupled to the bypass circuit and configured to control operation of the bypass circuit. In other embodiments, the first light emitting device can be connected in series to a first current source 'and the second light emitting device can be connected in series to a second current source, and the device can further include being coupled to the first current a controller of the source, and configured to selectively activate and deactivate the first current source based on the current level of the first light emitting device. [Embodiment] The accompanying drawings illustrate certain implementations of the invention. For example, the drawings are included to provide a further understanding of the present disclosure, and are incorporated herein by reference. Embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings. However, the invention may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and the scope of the invention will be fully conveyed by those skilled in the art. The same numbers refer to the same elements throughout the text. Embodiments of the present invention provide systems and methods for controlling solid state light emitting devices and illumination devices incorporating such systems and/or methods. In some embodiments, the same can be applied to the same application and collectively entitled "S〇lid State

U.S. Patent Application Serial No. 12/566,195, the entire disclosure of which is incorporated herein by reference. The side-wrap compensation circuit described in U.S. Patent Application Serial No. 12/566,142, the entire disclosure of which is incorporated herein by reference. Incorporated herein. The bypass compensation circuits can be switched between LEDs and variably shunt around LEDs and/or bypass LEDs in a solid state lighting system or device. According to one embodiment, the model is based on one or more variables such as current, temperature, and/or LED color system (brightness and/or color system) used and the bypass/split level employed The output of the illuminating device is turned on. The model can be adjusted for variations in individual illuminators. 159304.doc • 13· 201230873 Embodiments of the present invention are illustrated in Figures 5 through 5. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic illustration of some aspects of a solid state lighting (SSL) device 1A in accordance with the present invention. As seen in Figure 1, the SSL device 10 includes an LED string 2 (LED1 to LED9) connected in series between a voltage source Vstring and ground. A controller 15 is coupled to the string 20' and coupled to the control gates of the transistors Q1 and Q2 via control lines CL1 and CL2. A temperature sensor 12 provides temperature sensing information to the controller 15. The string 20 can include LEDs that emit different colors of light as current passes through the string. For example, some of these LEDs may comprise a phosphor coated LED that emits a broader spectrum of white or near white light when energized. Some of these LEDs can be configured to: emit a blue-shifted yellow light (BSY), as described in commonly assigned U.S. Patent No. 7,213,940, entitled "Lighting Device And Lighting Method", issued May 8, 2007. Revised in the number; and/or blue offset red light (BSR), as described on April 19, 2009, entitled "Methods for Combining Light Emitting Devices in a

US Patent No. 12/425,855 to Package and Packages Including Combined Light Emitting Devices, or US Patent No. 12/425,855, entitled "Solid State Lighting Devices Including Light Mixtures", October 26, 2010 The disclosure of such claims is incorporated herein by reference. Other LEDs can emit saturated or near-saturated narrow-spectrum light, such as blue, green, slap, yellow, or red, when energized. In a further embodiment, the LEDs may be BSY, as described in the same application and commonly assigned US Patent Application Publication No. 2009/0184616 159304.doc.

Red and blue LEDs in S 201230873 'in (Attorney Docket No. 931-040), the disclosures of which are hereby incorporated by reference, to the the the the the the the the the the the Blue (RGB) and / or red - green · blue - white (RGBW) combination. * In one example, LED 5 and LED 6 can be red LEDs, and LED 7 can be a blue LED. The remaining LEDs can be BSY and/or red LEDs. The LED string 20 includes a subset of LEDs that are selectively bypassable by actuating the transistors Q1 and Q2. For example, when the transistor Q1 is turned on, the LEDs 5 and 6 are bypassed, and the non-light-emitting diodes D1, D2, and D3 are switched into the string 20. Similarly, when the transistor Q2 is turned on, the LED 7 is bypassed, and the non-light-emitting diodes D4 and D5 are switched into the string 20. The non-light-emitting diodes D1 to D5 are included so that when the LEDs 5, 6 and 6 are switched away from the string by the transistors Q1 and Q2, the voltage variation of the entire string is reduced. The controller 15 controls the duty cycle of the transistors Q1 and Q2 based on the control signals loaded in the controller 15 via control signals on the control lines CL1 and CL2, as described in more detail below. In particular, the time-cycle of the action of the transistors Q1 and Q2 can be controlled in response to a model based on a factor such as: one of the temperature sensors provided by the temperature sensor 12; and / Or a current measurement in the string 20, for example, reflected by a change in the voltage across the LED 9 (refer to the application titled "LIGHTING APPARATUS USING A NON-LINEAR CURRENT SENSOR AND METHODS OF OPERATION" on December 15, 2010. U.S. Application Serial No. 12/968,789 (Attorney Docket No. 5308-1309) of THEREOF. The module can also be based on such LEDs (LED 1 to

S 159304.doc 201230873 LED 9) brightness and / or chromaticity system factor β The transistor qi and its action time cycle can be controlled such that the total combined light output from the string 2 具有 has a desired chromaticity or Color point. In some embodiments, the controller 15 can be a suitably configured programmable microcontroller such as an Atmel ATtinylO microcontroller. As will be discussed in more detail below, the model can define a Bezier surface based on a plurality of control points in response to the detected temperature and the current flowing through the string 2D for a red LED or blue The LED selects a time period of action. A model for controlling the operation of the ssl device 10 can be generated by calibrating the SSL device 1 using a calibration system, such as the calibration system illustrated in FIG. As seen in FIG. 2, an SSL device 1A including one or more LED strings 20 can be coupled to a test instrument housing 200, which includes a colorimeter 21, which is configured. To receive and analyze the light emitted by the LED string 2, the colorimeter 210 can be, for example, a PR-650 SpectraScan® colorimeter from ph〇t〇 Research Inc., which can be used for direct measurement of illumination, CIE Chromaticity (1931 xy and 1976 u'v') and/or correlated color temperature. The output of the colorimeter 210 is provided to a programmable logic controller (PLC) 220. The PLC 220 also receives a current measurement supplied to the LED string 20. The current measurement can be provided, for example, by a current/power sensor module 230 coupled to an AC power source 240 that supplies power to the SSL device 1A. In other embodiments, the control unit 5 senses the current in the LED string 20 and provides the current measurement to the PLc 220. As further illustrated in FIG. 2, the LED string 20 can be powered directly or powered by the controller 15 by an AC to DC converter 14. The controller 15 controls

159304.doc 16 S 201230873 The current level and/or the time of action of the LEDs in the LED string 20 are cycled to control the light output by the LEDs. The pLC 22A can be loaded with a controller 15 having a control point that can be calculated from the control point in response to the current and/or temperature measured by the method described in more detail below. Although the various functions of the system of Figure 2 are snatched as part of the SSL device 1 or the test instrument 200, such functions can be moved between the devices as needed. For example, if AC/DC conversion is provided as a single module, the conversion function can be provided as part of the test instrument 2 and the SSL device, or the module or sub-assembly of the SSL device 1G can have the control And (4). 3 is a flow diagram showing the operation of the system for developing a reference model. The reference models are used to tune spectrum an SSL device 10 in accordance with some embodiments. In the operation illustrated in FIG. 3, a model SSL device 1 or a reference group of LEDs including an LED controller (such as a controller included in an SSL device 1) is evaluated to develop a model, such The model uses the same LED and controller combination as the reference, and the same to subsequently tune the solid state light emitting device. The reference set can include, for example, BSY LEDs from two different color and/or color gamuts, one or more blue LEDs from one or more color and/or brilliance colors, and from one or more colors And/or one or more red LEDs of a luminescent color system. The particular LED combination of the LED reference set is selected based on the fabrication of an SSL device to be combined with a unique reference set, which is provided for use in manufacturing for each combination. To develop an accurate model for the SSL device, the reference group lED is supplied with energy 'and the color and/or intensity' of the light output of the reference group LED under various conditions and characterized under such conditions . The bars to be changed 159304.doc 17-201230873 are similar to the conditions expected to be encountered in the operation of the solid state lighting device. In some embodiments, the varying conditions are current level, temperature, and shunt level shunted around a particular LED, with a _ color point (e.g., a pulse width modulation control signal active time cycle). In other systems, more or fewer conditions may need to be changed. For example, if the SSL device is intended to be used in an environment where temperature control is performed, then the temperature is not changed and the evaluation is performed at the temperature of the control environment. When the light output characteristics for all of the shunt levels have been measured and stored, the lower-current level is then set and the shunt level is changed again, and the light output is measured and stored. This procedure is repeated until a measurement of the entire or - part of the operating range of the current is obtained. When the desired current range of the memory has been measured, the temperature of the 's LED reference group is adjusted to a new temperature' and the measurement procedure is repeated. This measurement procedure is repeated for the operating range (4) of the SSL device. Specifically, the temperature can be the temperature of one of the LED test points and can be measured directly for the LED reference set or by a controller. As seen in Figure 3, the evaluation of the LED reference set is performed by setting the temperature, setting the current, and setting the shunt level for a group of controlled LEDs, and then measuring the light output of the LED reference group based on the settings. The light output can be measured for a color point (e.g., a (u, v,) coordinate in a 1976 CIE chromaticity space) and/or a lumen output. The measurements can be stored and the light output can be measured in accordance with the selected increments across the operating range of the control circuit, which can be varied across the entire operating range of the control circuit. For example, referring to Figure 3, a temperature of the SSL device can be set (block 159304.doc • 18·

S 201230873 SI 0), a predetermined current can be applied to the LED string 20 (block SI 5), and a predetermined split level or active time cycle can be applied to a group of controlled LEDs, such as LED 5 shown in the figure LED6 (block S20). The chromaticity of the light output by the SSL device 10 (e.g., at (u', v·) coordinates) can be measured by the colorimeter 210 (block S25), which can be stored by the PLC 220 and measured. Chroma point. In some embodiments, in addition to or in lieu of measuring the color point of the light emitted by the SSL device 10, the intensity of the light output by the SSL device can also be measured at block S25 (in lumens) Measurement). Next, operation proceeds to block S30, wherein the PLC 220 determines whether the chromaticity point has been measured at the full partial flow level for the selected temperature and current. If not, the next shunt level is selected (block S35) and set (block S20), and the chrominance is measured at the new shunt level (block S25). Once the color measurement has been performed for the full partial flow level of the selected temperature and current level, the shunt level is reset (block S40), and the PLC 220 determines whether all current levels have been determined for the selected temperature. The chromaticity point is measured (block S45). If not, the next current level is selected (block S50) and set (block S15), and the chromaticity is measured for the full partial stream level at the new current level (blocks S20 through S35). Once the color measurement has been performed on the selected partial temperature and current level, the current level is reset (block S55), and the PLC 220 determines whether the chromaticity point is measured at all temperature levels (square S60). If not, the next temperature level is selected (block S65) and set (block S10), and the chromaticity is measured for the full partial stream level and current level at the new temperature level (blocks S15 through S65). 159304.doc -19- 201230873 Once the chromaticity point has been measured at all temperatures, shunt levels, and current levels, a model of the chrominance response of the SSL device 10 to temperature, current, and shunt level changes can be constructed ( Block S70). The operation illustrated in Figure 3 can be repeated for each operational aspect controlled by a controller of the LEDs. For example, if the SSL device sets a color point by shunting a current around a red LED (or a group of red LEDs) and separately shunting a current around a blue LED (or group of blue LEDs), The shunts around the red LEDs are individually maintained constant while the measurements of the blue LEDs are performed to measure the results of controlling the LEDs of the different colors, and vice versa. This correlation property is possible in the effects of changes in the blue and red levels. This is because the blue LED mainly affects the color point of the ν' axis, while the red LED mainly affects the color point of the u' axis. In addition, if any color shift is expected in the current change of a red LED or a blue LED, it is very small. If there is an interaction between the variables controlled by the controller 10, additional loops can be incorporated into the operation of Figure 3 to account for such interactions. For example, if a color point is set by shunting two phosphor-converted LEDs (such as a BSY LED and a BSR LED), it may be necessary to measure the BSY LED at each current, temperature, and shunt level of the BSR LED. The color points measured at each current, temperature, and shunt level are used to fully characterize the interaction between the current, temperature, and shunt levels of the LED reference set. Once the effects of changes in current, temperature, and shunt levels on the color point and/or lumen of an SSL device have been characterized, a predictive model can be developed to allow tuning and operation to control the LEDs in the SSL device 10. . In special

159304.doc -20- S 201230873 In a given embodiment, it can be constructed based on light output characteristics such as color points (UI, V, and/or intensity of lumens), temperature, current level, and variables of shunt levels. A Bezier surface. These Bessel surfaces are then used as a model to control the operation of an SSL attack 10 having the same LED combination as the LED reference set. A Bezier surface is a mathematical tool that models a multidimensional function using a finite number of control points. In particular, select several control points that define the surface in the M-dimensional space. The surface is defined by the control points in a manner similar to interpolation. However, although the surface is defined by the control points, the surface does not necessarily travel through the control points. Rather, the surface is deformed toward the control points and the amount of deformation is constrained by other control points. A given Bessel surface of the order (n m) is defined by a set of (n + l) (m + 1) control points kj j . The two-dimensional Bessel aspect can be defined as a parametric surface, where the position of a point p on the surface as a function of the parameter coordinates u, v is given as: p(w^) = Bf{v) k, where The Bessel function B is defined as

159304.doc 201230873 Six control points 3Π) define the surface fan, which is the point in the three-dimensional space represented by the X-axis 'y-axis and z-axis shown in Figure 4. As can be seen in Figure 4, the surface 3〇〇 is deformed towards the control points 31〇, but the control points 310 are not all on the surface 3〇〇. The Bezier surface provides a mathematically convenient model for multidimensional relationships such as modeling a lprint «· level as a function of temperature and current for a given output chromaticity, since this is entirely limited A number of control points (eg, sixteen) characterize the Bezier surface. The manufacturing calibration and/or operation of an SSL device having the same LED combination as the reference group can be implemented as illustrated in FIG. As seen in Figure 5, the five-axis models (u, ν, 'Τ, !, and s) collapse to a three-axis model based on the desired color point (u, v,), where the shunt level is determined as A function of current (1) and temperature (7) (block S100). That is, a three-axis model is constructed in which the shunt level is dependent on the current and temperature level at a given color point. In some embodiments, a set of control points (which may include 16 control points in some embodiments) is established for the desired u, v, value such that a selection group required to achieve the desired (,) value is achieved. One or more of the controlled red LEDs are flow-based based on a dependent variable of temperature and current levels 〇 establishing 16 control stations for the desired ui, v, value, and Corresponding to the steroid, the shunt level of one or more of the controlled blue LEDs required to achieve the desired (u', v,) value is based on a dependent variable of temperature and current levels. These control points are then used by the SSL device 1 to control the light output of the SSL device (block S105), and to measure a characteristic of the light output, such as a color point and/or intensity (block S110). 159304.doc δ -22- 201230873 The difference between the measured color point and the desired color point is measured (ie, offset X square SU5). If the measured color point is within the specification of the device (block 120)' then no additional operations need to be performed and the hungry device utilizes the determined set of control points to control the shunting of the red and blue LEDs to Changes in temperature and current levels maintain color points. The control points may be stored in the SSL device for a long time to control the operation of the SSL device 1 in normal operation, and if the measured color point is outside the specification of the device 1 The offset between the measured color point and the desired color point is used to select a new target u, v value (block S125). The five variable models are again collapsed, the control points are set in the controller, and the device is operated using the new control points (block S130), and the light output is again measured (block su〇). For example, if the u value is lower than the desired value 〇 〇1〇, then the desired u, the value can be increased by 〇 〇ι〇 to compensate, and a new control point is developed. These operations can be repeated until the color point of the ssl device is within the specification, or until the attempt has reached a maximum number. In addition, the amount of adjustment allowed can be gradually reduced to avoid continuous over-compensation, which can result in a color point never being reached within the desired specification. Figure 7 is a schematic circuit diagram of a portion of a solid state light emitting device 41 in accordance with a further embodiment. The solid state lighting device 41A includes a controller 15 coupled to a plurality of current sources 25A-25C via control lines CL3 to CL5, each of which supplies current to a respective group G1 of LEDs connected in series To G3. A temperature sensor 12 supplies a temperature measurement of the solid state light emitting device 41 to the controller 15 , and a current sensor 16 measures the current through each of the LEDs of the groups These current measurements are supplied to the controller 159304.doc -23- 201230873 15. The controller 15 can control the duty cycle of the LED groups G1 through G3 by selectively activating/deactivating the current sources 25A through 25B. The LED groups G1 to G3 may comprise the same or different types of LEDs. For example, in one embodiment, group G3 contains all BSY LEDs, while group G2 contains all blue LEDs and group G3 contains all red LEDs. The duty cycle of one or more LED groups can be selected and controlled in accordance with the operations described above. It will be understood that, although the terms first, second, etc. may be used herein to describe the elements of the present invention, such elements are not limited by such terms. These terms are only used to distinguish one element from the other. For example, a first element could be termed a second element without departing from the scope of the invention, and similarly, a first element may be referred to as a - element. The term 'and/or' as used herein includes any and all combinations of one or more of the associated listed items. The terminology used herein is for the purpose of describing particular embodiments, and is not intended to limit the invention. As used herein, the singular forms "a", "an" and "the" are intended to mean that the singular forms "a" When package 3", specify that there are stated features, integers, steps: more:; he does not exclude the existence or addition of -::::: features, integers, steps, operations, components, components and / or unless Also defined, no target gentleman - + all the terms used in this article (including technology 159304.doc

S - 24 · 201230873 and scientific terminology have the same meaning as commonly understood by those of ordinary skill in the art. It is to be further understood that the terms used herein are to be interpreted as having a meaning that is consistent with the meaning of the description and the related art, and should not be interpreted as an ideal unless so defined herein. Or excessive formal meaning. Many different embodiments have been disclosed herein in connection with the above description and drawings. It will be understood that each combination and sub-combination of the embodiments may be in a Accordingly, all of the embodiments can be combined in any manner and/or in combination, and the present specification, including the drawings, should be interpreted as all combinations and sub-combinations of the embodiments described herein, and methods of making and using the same. A fully written description of the program consists of and should support any such combination or sub-combination of the claim. In the drawings and the specification, the preferred embodiments of the present invention are disclosed, and the invention is intended to be in a generic and descript Explained in the request. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic circuit diagram of a portion of a solid state lighting device in accordance with some embodiments. 2 is a block diagram of a calibration system for a solid state lighting device in accordance with some embodiments. Figure 3 is a flow chart showing a calibration system/method of a solid state light-emitting device of one of the two embodiments. Figure 4 depicts that it cannot be used to characterize one of the solid-state illumination according to some embodiments. 159304.doc £-1 -25· 201230873 Some aspects of a Bezier surface. Figure 5 illustrates an operational method of a solid state lighting device in accordance with some embodiments. Figure 6 shows a 1931 CIE chromaticity diagram. Figure 7 is a schematic circuit diagram of a portion of a solid state lighting device in accordance with a further embodiment. [Main component symbol description] 10 Solid-state light-emitting device 12 Temperature sensor 14 AC/DC converter 15 Controller 16 Current sensor 20 Light-emitting diode string 25A Current source 25B Current source 25C Current source 100 Area 101 Area 102 Area 103 Area 104 Area 105 Area 106 Planck Execution 200 Test Equipment Case

159304.doc -26- S 201230873 210 Colorimeter 220 Programmable Logic Controller 230 Current/Power Sensing Module 240 AC Power Supply 300 Bezier Surface 310 Control Point 410 Solid State Lighting CL1 Control Line CL2 Control Line CL3 Control Line CL4 Control line CL5 Control line D1 Non-emitting diode D2 Non-emitting diode D3 Non-lighting diode D4 Non-lighting diode D5 Non-lighting diode G1 Light-emitting diode group G2 Light-emitting diode group Group G3 LED Group LED1 LED (LED) LED2 LED (LED) LED3 LED (LED) LED4 LED (LED) s 159304.doc -27- 201230873 LED5 Illumination Diode (LED) LED6 Light Emitting Diode (LED) LED 7 Light Emitting Diode (LED) LED8 Light Emitting Diode (LED) LED9 Light Emitting Diode (LED) Q1 Transistor. Q2 Transistor

159304.doc 28 S

Claims (1)

201230873 VII. Patent Application Range: 1. A method of controlling a solid state light emitting device, the method comprising: a temperature based on one of the at least one light emitting device of the solid state light emitting device and a target color chromaticity for light generated by the solid state light emitting device Supplying a current level to one of the light emitting devices to provide a first time period of the active time of the light emitting device; responding to the temperature of the light emitting device according to the first mode and supplying the temperature to the at least one light emitting device Controlling the active time cycle of the light emitting device by a change in at least one of the current levels; measuring the light generated by the solid state light emitting device in response to controlling the active time cycle of the at least one light emitting device according to the first model An actual chromaticity; comparing the measured chromaticity of the light output by the solid state light emitting device with the target chromaticity of light output by the solid state light emitting device; responsive to the measured chromaticity and the target a difference between chromaticities based on the temperature of the illuminating device and an adjustment to the light produced by the solid state lighting device The chromaticity is supplied to the current level of the light emitting device to provide a second model of the active time cycle of the at least one light emitting device; and controlling the active time cycle of the at least one light emitting device according to the second model 2. The method of claim 1, wherein the first model of the active time cycle of the at least one light emitting device of the solid state light emitting device comprises a plurality of control points of a Bessel surface, the Bessel surface The active time cycle of at least one of the light emitting devices 159304.doc 201230873 is associated with the temperature of the light emitting device and the current level supplied to the light emitting device for the target color. 3. A method of controlling a solid state lighting device, the method comprising: ▲ providing an operational parameter of the solid state lighting device based on at least one operating condition of the solid state lighting device for a target light output characteristic of the solid state lighting device a first model; controlling an operating parameter of the first plurality of light emitting devices in response to a change in the at least one operating condition; measuring the light output characteristic of the solid state light emitting device; comparing the measured An acceptable range of light output characteristics and light output characteristics of the solid state light emitting device; responsive to a difference between the measured light output characteristic and the target light output characteristic, based on adjusting one of the solid state light emitting devices Providing a second model of the operational parameter of the solid state lighting device for the at least one operating condition of the solid state lighting device of the target light output characteristic; and responsive to a change in the at least one operating condition based on the second model The operational parameters of the first plurality of light emitting devices are controlled. The method of claim 3 wherein the operational parameter comprises an active time cycle of current supplied to at least one of the solid state lighting devices. 5. The method of claim 3, wherein the at least one operating condition of the solid state lighting device comprises a temperature of the solid state lighting device. 6. The method of claim 3, wherein the at least one operating condition of the solid state lighting device comprises a current supplied to at least one of the light emitting devices 159304.doc S -2 · 201230873 of the solid state lighting device. 7. The method of claim 3, wherein the at least one operating condition of the solid-state lighting device comprises the solid-state lighting, the _, the 'Tian, the 匕 元 哀, and the supply to the solid state a current of at least one of the light emitting devices. 8. The method of claim 3, wherein the first model of the operational parameter of the solid state lighting device comprises a plurality of control points of a Bessel surface, the operating parameter of the solid state lighting device being At least one operating strip of the solid state lighting device for the target light output characteristic. 9. The method of claim 3, wherein the light output characteristic comprises a chromaticity point of light that is rotated by the solid state light emitting device. 10. The method of claim 3, wherein the light output characteristic comprises an intensity of light output by the solid state light emitting device. 11. The method of claim 3, wherein the solid state lighting device comprises: a first plurality of light emitting devices configured to emit light having a first chromaticity when energized; and a second plurality Light emitting devices, configured to emit light having a second chromaticity different from the first chromaticity when energy is supplied, wherein the operational parameter includes an effect of operation of the first plurality of illuminating devices Time loop. 12. A solid state lighting device comprising: a first light emitting device configured to emit light having a first chromaticity when energized; a second light emitting device configured to emit a light different from the second chromaticity of the first chromaticity; and S 159304.doc 201230873 a controller configured to control a current level supplied to the first illuminating device; wherein the β sin controller Configuring to control the current level of the first light emitting device in response to a change in one of the operating conditions of the solid state lighting device according to one of the current levels, the model of the current level being the first The current level of the light emitting device is associated with the operating condition of the solid state lighting device for a target light output characteristic of the solid state lighting device. 13. The device of claim 12, wherein the operating condition of the solid state light emitting device comprises a temperature of one of the solid state light emitting devices and/or supply to at least one of the solid state light emitting devices a current. The device of claim 12, wherein the model of the current level of the first illumination device comprises a plurality of control points of a Bessel surface, the Bessel surface of the current level of the first illumination device This operating condition of the solid state lighting device for the target light output characteristic is associated. The device of claim 12, wherein the light output characteristic comprises a chromaticity point of light output by the solid state light emitting device. The device of claim 12, wherein the light output characteristic comprises an intensity of light output by the solid state light emitting device. The device of claim 12, wherein the first light emitting device and the second light emitting device are connected in a series of strings, and the device further comprises: a bypass circuit configured to selectively bypass the first A light emitting device and a controller coupled to the bypass circuit and configured to control operation of the bypass circuit. The device of claim 12, wherein the first light emitting device is connected in series to a first current source of 159304.doc -4 - 201230873, and the second light emitting device is connected in series to a music, __" The apparatus further includes a controller coupled to the first current source and configured to selectively activate and deactivate the first current source based on the current level of the first light emitting device. 19. The device of claim 12 wherein at least one of the first light emitting device and/or the second light emitting device comprises a plurality of light emitting devices. The device of claim 12, wherein the current level of the first illuminating device circulates for a period of time of the first illuminating device. 159304.doc