WO2015109859A1 - Système d'éclairage à lumière blanche et procédé de commande associé - Google Patents

Système d'éclairage à lumière blanche et procédé de commande associé Download PDF

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Publication number
WO2015109859A1
WO2015109859A1 PCT/CN2014/086707 CN2014086707W WO2015109859A1 WO 2015109859 A1 WO2015109859 A1 WO 2015109859A1 CN 2014086707 W CN2014086707 W CN 2014086707W WO 2015109859 A1 WO2015109859 A1 WO 2015109859A1
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WO
WIPO (PCT)
Prior art keywords
light
illumination system
emitting element
heating
control
Prior art date
Application number
PCT/CN2014/086707
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English (en)
Chinese (zh)
Inventor
梁兴华
蔡培崧
徐宸科
时军朋
林素慧
赵志伟
Original Assignee
厦门市三安光电科技有限公司
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.)
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Publication date
Application filed by 厦门市三安光电科技有限公司 filed Critical 厦门市三安光电科技有限公司
Publication of WO2015109859A1 publication Critical patent/WO2015109859A1/fr

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/481—Disposition
    • H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/48225—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
    • H01L2224/48227—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation connecting the wire to a bond pad of the item

Definitions

  • the present invention relates to a white light illumination system based on light emitting diodes, and more particularly to a white light illumination system having a high color rendering index (CRI ⁇ 80).
  • Solid-state lighting especially light-emitting diodes (LEDs)
  • LEDs Since the LEDs produced by direct production are monochromatic light, in order to obtain white light, a plurality of colors must be mixed to form.
  • white LEDs There are two ways to prepare white LEDs: one is to use blue/ultraviolet LED to excite the light conversion material; the other is to directly mix the red, green and blue LEDs.
  • color rendering index is generally required to be greater than 80.
  • CRI color rendering index
  • the use of three primary color LEDs to mix light into a white illumination system may result in a poor CRI effect due to its too narrow spectrum; if a blue/ultraviolet LED is used to excite the light conversion material to form white light, it is necessary to increase the conversion to red light.
  • the material due to the higher Stokes loss, results in lower luminous efficiency and increased cost. Therefore, it is difficult to achieve high CRI and high luminous efficiency at the same time in the above two ways.
  • U.S. Patent Nos. 6,513, 949, 6, 692, 136, 6, 657, 073, and US Pat. No. 7,213, 940 disclose the use of an LED-excited light-converting material that emits short-wavelength light (blue light) to emit medium-wavelength light (yellow/green light) with LEDs that emit long-wavelength light (red light). At the same time, it has a wide spectrum and high red light luminous efficiency, achieving high CRI and luminous efficiency.
  • the above-mentioned blue LED combined with the light conversion material and the system with the red LED has the following problems: the emission intensity of the blue LED, the light conversion material and the red LED is different from the temperature response; since the light source system is in the lighting instant and The temperature difference after reaching the thermal equilibrium is large, which causes the spectral composition of the light source system to illuminate instantaneously and after thermal equilibrium to be very different, that is, the color point of the light source system is greatly different when the light is turned on and after a period of lighting. Causes visual deviation, which seriously affects consumers' recognition and trust in products.
  • the invention aims to realize the white light illumination system with high CRI and high luminous efficiency while overcoming the problem of color point difference after lighting instant and reaching thermal balance.
  • the invention reconfigures the heating element and the control element on the basis of the light-emitting element, and controls the opening and closing of the light-emitting element and the heating element by the control element, so that the temperature difference of the light-emitting element after the lighting instant and after reaching the steady state is not realized.
  • the color point/color temperature that affects its illumination.
  • a white light illumination system comprising: a light-emitting element consisting of at least two light-emitting diodes operable to generate white light; a heating element capable of being controlled to generate heat to heat the illumination system; , which can respectively control the opening and closing of the light-emitting element and the heating element; the control element controls the heating element to heat the light-emitting element before opening the light-emitting element, thereby reducing the light-emitting element
  • the difference in temperature between the moment of illumination and the steady state is achieved, so that the color point of its illumination remains substantially unchanged after the moment of illumination and after reaching steady state.
  • the color point difference of the light-emitting element after the lighting instant and after reaching the steady state does not exceed the 7th-order MacAdam ellipse.
  • the color point difference of the light-emitting element after the lighting instant and after reaching the steady state does not exceed the 4th-order MacAdam ellipse.
  • the light emitting element comprises: at least one blue LED, which can emit a dominant wavelength of 400 nm to 490 nm Blue light; at least one light-converting material that absorbs part of the blue light and emits yellow-green light having a dominant wavelength of 490 nm to 600 nm; at least one red light LED that emits red light having a dominant wavelength of 600-700 nm.
  • the light converting material may be in close contact with the blue LED surface. In other embodiments, the light converting material may be separated from the blue LED and covered in its light exiting direction.
  • the heating element may be one or a combination of a heating wire, a silicon carbide, a silicon molybdenum rod, a PTC electric heating element, an electrothermal coating, and adjacent to the light emitting element.
  • the different light emitting diodes share a single heating element.
  • the different light emitting diodes correspond to different heating elements, which are the same heating mode or different heating modes.
  • the control element has the function of a timer that, when the heating time reaches a predetermined time, turns off the heating element, turning the light-emitting element on.
  • the timer of the control element includes: an on-delay type, an off-delay type, a hold-on delay type, a pulse type, and an expansive pulse timer.
  • control element has a temperature control function that turns the heating element off and turns on the light emitting element when the heating temperature reaches a preset temperature.
  • the thermostat of the control element comprises: a snap-type thermostat, a liquid-type thermostat, a pressure thermostat and an electronic thermostat.
  • control elements have different control objectives for the user to select, including color rendering index (CRI) and correlated color temperature (CCT).
  • CRI color rendering index
  • CCT correlated color temperature
  • the control target corresponds to a set of built-in different control targets, including one or a combination of current, heating time, and heating temperature.
  • a method for controlling the foregoing white light illumination system comprising the steps of: the control element turning on the heating element, preheating the light emitting element; when the lighting system reaches a preset condition
  • the control element turns off the heating element, the light-emitting element is turned on, thereby reducing the temperature difference of the light-emitting element after the lighting instant and reaching the steady state, so that the color point of the light-emitting element is reached at the moment of lighting It remains basically unchanged after steady state.
  • control element controls the heating element and the light emitting element by a timer, and when the heating time reaches a preset time, the heating element is turned off, and the light emitting element is turned on.
  • the preset temperature is equal to or lower than a heat balance temperature of the light emitting element.
  • the preset temperature is lower than a heat balance temperature of the light emitting element by 5 to 10 °C.
  • the lighting system does not require complicated circuit design, reduces system complexity, reduces cost, and is suitable for mass production preparation.
  • Figure 1 shows the normalized relative intensity of different LED chips as a function of temperature.
  • Embodiment 2 is a top plan view of the white light illumination system of Embodiment 1.
  • Figure 3 is a side cross-sectional view of the white light illumination system taken along line A-A of Figure 2 .
  • Figure 5 shows the effect of controlling the heating target temperature of the white light illumination system on the color point before and after heating.
  • Figure 6 is a side cross-sectional view of the white light illumination system of Example 3.
  • FIG. 7 is a schematic diagram of an operating system of the white light illumination system of Embodiment 4.
  • the temperature difference between the light source system at the moment of lighting and its reaching thermal equilibrium is large, and the light source system is lit immediately due to the difference in the response of the emission intensity of the blue LED, the light conversion material, and the red LED to the temperature.
  • the spectral composition after thermal equilibrium varies greatly.
  • a blue LED chip, a blue LED chip containing a phosphor (white light chip), and a red LED chip are used, and the brightness thereof is measured as a function of ambient temperature.
  • the following embodiments disclose a white light illumination system that configures a heating element and a control element on the basis of a light-emitting element, and controls the opening and closing of the light-emitting element and the heating element by the control element, thereby realizing that the light-emitting element is The difference in temperature between the moment of illumination and the steady state does not affect the color point/color temperature of the light.
  • a white light illumination system 100 includes: a thermally conductive substrate 101 (201) and a red LED chip 105 (205), a blue LED chip 107 (207), and a cover thereon.
  • Below the LED chip there is a heating element 106 (206) inside the thermally conductive substrate. Mounting the heating element in this position facilitates simultaneous heating of the red/blue LED and the light converting material, as well as controlling the temperature of the chip.
  • the control element 102 is used to control the turning on and off of the light emitting element and the heating element such that the difference in color point of the light emitting element after the lighting instant and after reaching the steady state does not exceed the 7th order MacAdam ellipse.
  • the red LED is an AlGaAs material
  • the blue LED is a GaN material
  • the light conversion material is a yellow YAG phosphor dispersed in a transparent silica gel
  • the phosphor is conformal coating, which is beneficial to CCT It is more uniform with the angle and controls the heat dissipation of the phosphor
  • the hemispherical lens is made of PMMA material
  • the heating element is made of PTC electric heating element
  • the control element adopts the timing mode to control the switching of the switch, and the 555 timer can be selected; the determined heating The time makes the difference of the color point of the light-emitting element after the lighting instant and after reaching the steady state is less than the 4th-order MacAdam ellipse, and the specific heating time needs to be determined according to different heat dissipation systems.
  • the white light illumination system 300 of the present embodiment includes a heat conductive substrate 301 and a red LED chip 305, a blue LED chip 307, and a light conversion material 308 covering the surface of the blue LED and a cover.
  • a hemispherical lens 303 that covers the light exiting surface.
  • Below the LED chip there is a heating element 306 inside the thermally conductive substrate. Mounting the heating element in this position facilitates simultaneous heating of the red/blue LED and the light converting material, as well as controlling the temperature of the chip.
  • the control element 302 is used to control the turning on and off of the light emitting element and the heating element such that the difference in color point of the light emitting element after the lighting instant and after reaching the steady state does not exceed the 7th order MacAdam ellipse.
  • the red LED is a GaP material
  • the blue LED is a GaN material
  • the light conversion material is a yellow YAG phosphor dispersed in a transparent silica gel
  • the phosphor is in a manner away from a remote phosphor, which is advantageous for the chip light emission and Control the phosphor temperature
  • the hemispherical lens is made of silica gel material
  • the heating element uses PTC electric heating element
  • the control element uses temperature control to control the switching of the switch, and the optional electronic thermostat.
  • the determined heating target temperature is such that the difference in color point of the illuminating element after the lighting instant and after reaching the steady state is less than the 4th order MacAdam ellipse.
  • the determined heating target temperature is equal to or lower than the temperature of the heat balance, and preferably may be lower than the specific heat balance temperature by 5 to 10 °C.
  • Figure 5 shows the effect of controlling the heating target temperature of the white light illumination system on the color point before and after heating.
  • the temperature at the instant of illumination is equal to the temperature of the thermal equilibrium, at which point the color coordinate point is at the center of the MacAdam ellipse; when the lighting instant differs from the thermal equilibrium by about 5 ° C (ie, the heating target temperature is lower than the thermal equilibrium temperature 5 °C), at this time, the color coordinate point is just inside the 4th-order MacAdam ellipse; when the lighting instant is different from the thermal balance by about 10°C (ie, the heating target temperature is lower than the thermal equilibrium temperature by 10°C), the color coordinate point is just at the 7th order.
  • Mike Adam is inside the ellipse.
  • the difference between the light-emitting moment and the color point after reaching the heat balance is much larger than the 7-step MacAdam ellipse. It should be noted that, because the brightness of the LED chips of different manufacturers may have different responses to temperature, the color point change corresponding to the temperature difference controlled by the embodiment is adopted for some specific chips. Before designing the heating/control element, you should first understand the brightness-to-temperature response curve of the chip used, and design the control parameters and targets according to the response curve.
  • the white light illumination system 400 of the present embodiment includes: two mutually independent heat conductive substrates 401, red LED chips 405 respectively fixed on the heat conductive substrate, blue LED chips 407, and light covering the surface of the blue LEDs.
  • the conversion material 408 covers the hemispherical lens 403 on the light exit surface of the LED chip.
  • red/blue LED core Below the sheet, there is a heating element 406 inside each of the thermally conductive substrates. Since the red/blue LEDs are thermally isolated from each other, their optimal operating temperatures will vary.
  • two heating elements are arranged to respectively heat the red/blue LEDs, and the two heating elements are respectively controlled by the control element 402, so that the light-emitting elements operate in respective optimal modes, and are stabilized at the moment of lighting.
  • the color point difference after the state does not exceed the 7th order MacAdam ellipse.
  • the red LED is an AlGaAs material
  • the blue LED is a GaN material
  • the light conversion material is a yellow YAG phosphor dispersed in a transparent silica gel
  • the phosphor is conformal coating, which is beneficial to CCT
  • the change with angle is more uniform and control the heat dissipation of the phosphor
  • the hemispherical lens is made of PMMA material
  • the heating element is made of PTC electric heating element
  • the control element adopts temperature control mode to control the switching of the switch, and the optional electronic thermostat.
  • the determined heating target temperature is 5 ° C lower than the heat balance temperature, so that the color point difference of the light-emitting element after the lighting instant and after reaching the steady state is smaller than the 4th-order MacAdam ellipse.
  • the foregoing embodiments are all white light illumination systems operating in a single mode according to the present invention.
  • This embodiment will introduce a plurality of modes together, stored in the system, and provide modules for the user to use.
  • the operating system 500 of the multi-mode white light illumination system includes a control target module 502, a control element module 501, a control parameter module 503, a heating element 504, and a light-emitting element 505.
  • the user inputs a desired illumination target 502, such as CCT, CRI, brightness, etc., in the control element 501 according to his own needs, and the control element can be converted into control parameters such as current, heating time, heating temperature, etc. according to the entered data.
  • the color point difference of the light emitting element after the lighting instant and after reaching the steady state does not exceed the 7th order MacAdam ellipse.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Led Device Packages (AREA)

Abstract

La présente invention concerne un système d'éclairage à lumière blanche et un procédé de commande associé. Ledit système comprend : un élément électroluminescent qui comprend au moins deux diodes électroluminescentes capables de produire de la lumière blanche ; un élément chauffant qui peut être commandé pour produire de la chaleur pour chauffer le système d'éclairage ; et un élément de commande pour commander l'allumage et l'arrêt de l'élément électroluminescent et de l'élément chauffant respectivement. L'élément de commande commande l'élément chauffant pour chauffer l'élément électroluminescent par avance et puis allume l'élément électroluminescent, réduisant ainsi la différence entre la température de l'élément électroluminescent lors de l'allumage et la température de l'élément électroluminescent après avoir atteint le régime permanent, pour que le point coloré électroluminescent de l'élément électroluminescent reste essentiellement inchangé lors de l'allumage et après être entré dans un régime permanent.
PCT/CN2014/086707 2014-01-26 2014-09-17 Système d'éclairage à lumière blanche et procédé de commande associé WO2015109859A1 (fr)

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Application Number Priority Date Filing Date Title
CN201410037210.8A CN103747597B (zh) 2014-01-26 2014-01-26 白光照明系统及其控制方法
CN201410037210.8 2014-01-26

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WO2015109859A1 true WO2015109859A1 (fr) 2015-07-30

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103747597B (zh) * 2014-01-26 2017-02-15 厦门市三安光电科技有限公司 白光照明系统及其控制方法
CN106322148B (zh) * 2016-10-21 2023-06-06 四川省桑瑞光辉标识系统股份有限公司 一种led灯板调光系统和方法
CN108663856B (zh) 2017-03-30 2020-01-24 京东方科技集团股份有限公司 背光模组的制造方法及装置、显示装置及系统
CN113270437A (zh) * 2020-02-17 2021-08-17 京东方科技集团股份有限公司 背板及其制备方法、显示装置

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CN101162564A (zh) * 2006-10-13 2008-04-16 三星电子株式会社 背光单元驱动装置、液晶显示设备及其控制方法
US7397204B2 (en) * 2002-05-16 2008-07-08 Balboa Instruments, Inc. Starting circuit for electric discharge lamp
WO2012118653A2 (fr) * 2011-03-03 2012-09-07 Cree, Inc. Dispositifs électroluminescents à semi-conducteur dotés de points de couleur sélectionnables et/ou réglables et procédés apparentés
CN103747597A (zh) * 2014-01-26 2014-04-23 厦门市三安光电科技有限公司 白光照明系统及其控制方法

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Publication number Priority date Publication date Assignee Title
US6577073B2 (en) * 2000-05-31 2003-06-10 Matsushita Electric Industrial Co., Ltd. Led lamp
EP2055149B1 (fr) * 2006-08-14 2017-04-19 Philips Intellectual Property & Standards GmbH Dispositif électroluminescent ayant un point de couleur variable
EP3051586B1 (fr) * 2007-10-09 2018-02-21 Philips Lighting North America Corporation Luminaire à base de del intégrées pour éclairage général
WO2012077046A2 (fr) * 2010-12-09 2012-06-14 Koninklijke Philips Electronics N.V. Dispositif électroluminescent à point de couleur ajustable

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7397204B2 (en) * 2002-05-16 2008-07-08 Balboa Instruments, Inc. Starting circuit for electric discharge lamp
CN101162564A (zh) * 2006-10-13 2008-04-16 三星电子株式会社 背光单元驱动装置、液晶显示设备及其控制方法
WO2012118653A2 (fr) * 2011-03-03 2012-09-07 Cree, Inc. Dispositifs électroluminescents à semi-conducteur dotés de points de couleur sélectionnables et/ou réglables et procédés apparentés
CN103747597A (zh) * 2014-01-26 2014-04-23 厦门市三安光电科技有限公司 白光照明系统及其控制方法

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