WO2014097397A1 - Dispositif électroluminescent et procédé de commande d'un dispositif électroluminescent - Google Patents

Dispositif électroluminescent et procédé de commande d'un dispositif électroluminescent Download PDF

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Publication number
WO2014097397A1
WO2014097397A1 PCT/JP2012/082807 JP2012082807W WO2014097397A1 WO 2014097397 A1 WO2014097397 A1 WO 2014097397A1 JP 2012082807 W JP2012082807 W JP 2012082807W WO 2014097397 A1 WO2014097397 A1 WO 2014097397A1
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WO
WIPO (PCT)
Prior art keywords
light
light emitting
mode
luminance
emitting device
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Application number
PCT/JP2012/082807
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English (en)
Japanese (ja)
Inventor
平沢　明
Original Assignee
パイオニア株式会社
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
Application filed by パイオニア株式会社 filed Critical パイオニア株式会社
Priority to PCT/JP2012/082807 priority Critical patent/WO2014097397A1/fr
Publication of WO2014097397A1 publication Critical patent/WO2014097397A1/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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • 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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/58—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving end of life detection of LEDs
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H05B45/22—Controlling the colour of the light using optical feedback
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to a light emitting device and a method for controlling the light emitting device.
  • LED Light Emitting Diode
  • organic EL organic electroluminescence
  • Patent Document 1 the technique described in Patent Document 1 is provided with a light receiving element for measuring the light amount of the light emitting element, and corrects a signal input to the light emitting element based on the output of the light receiving element.
  • Patent Documents 2 and 3 describe that a plurality of surface light emitting units are arranged to be used as illumination, and that the illumination device has a bright lighting mode and a dark lighting mode.
  • Patent Document 2 describes that the temperature of each surface light emitting unit in the bright lighting mode is detected and the luminance of each surface light emitting unit in the dark lighting mode is determined based on the detection result.
  • Patent Document 3 describes that the brightness of each surface light emitting section in the bright lighting mode is detected and the brightness of each surface light emitting section in the dark lighting mode is determined based on the detection result.
  • JP 2003-317944 A Japanese Patent No. 4976604 Japanese Patent No. 4976605
  • the present inventor has studied a method for reducing the difference in deterioration of light emitting elements.
  • An example of a problem to be solved by the present invention is to suppress the occurrence of individual differences in the deterioration of a light emitting element.
  • the invention according to claim 1 is a light emitting unit having a plurality of light sources each having a light emitting element; A control unit that causes the light emitting unit to emit light in a plurality of light emitting modes including a bright mode that is a first light amount and a dark mode that is a second light amount that is less than the first light amount; A luminance detector that detects the luminance of each of the plurality of light sources; With The control unit is a light emitting device that selects the light source to emit light in the dark mode based on a detection result of the luminance detection unit while the light emitting unit is driven in the bright mode.
  • the invention according to claim 3 is a light emitting unit having a plurality of light sources each having a light emitting element; A control unit that causes the light emitting unit to emit light in a plurality of light emitting modes including a bright mode that is a first light amount and a dark mode that is a second light amount that is less than the first light amount; A luminance detector that detects the luminance of each of the plurality of light sources; With The control unit causes only a part of the plurality of light sources to emit light in the dark mode, switches the light source to emit light during the dark mode, and sets a light emission time of each of the plurality of light sources. In the light emitting device, the relative ratio is increased as the luminance by the luminance detector increases.
  • Invention of Claim 7 is a control method of a light-emitting device provided with the light emission part which has multiple light sources which have a light emitting element,
  • the light emitting unit emits light in one of a plurality of light emission modes including a bright mode that is a first light amount and a dark mode that is a second light amount that is less than the first light amount,
  • the light source that should emit light in the dark mode is selected based on a detection result of luminance of each of the plurality of light sources while the light-emitting unit is driven in the bright mode.
  • Invention of Claim 8 is a control method of a light-emitting device provided with the light emission part which has multiple light sources which have a light emitting element,
  • the light emitting unit emits light in one of a plurality of light emission modes including a bright mode that is a first light amount and a dark mode that is a second light amount that is less than the first light amount, Detecting the brightness of each of the plurality of light sources while the light emitting unit is driven in the bright mode; In the dark mode, only a part of the plurality of light sources is caused to emit light, and during the dark mode, the light source to be emitted is switched, and the relative ratio of the light emission times in each of the plurality of light sources is This is a method of controlling a light emitting device that increases as the luminance in the bright mode increases.
  • FIG. 2 is a block diagram illustrating a functional configuration of a light emitting device according to Example 1.
  • FIG. It is a figure for demonstrating an example of the layout of a brightness
  • FIG. 6 is a block diagram illustrating a functional configuration of a light emitting device according to Example 2.
  • FIG. It is a flowchart which shows operation
  • FIG. 9 S230 It is a figure for demonstrating the 1st example of control of the control part in FIG.9 S230.
  • FIG.9 S230 It is a figure for demonstrating the 2nd example of control of the control part in FIG.9 S230.
  • 6 is a diagram illustrating a layout of a luminance sensor in a light emitting device according to Example 3.
  • FIG. It is a figure which shows the modification of FIG. It is a figure which shows the modification of FIG. It is a figure which shows the modification of FIG.
  • FIG. 1 is a block diagram illustrating a functional configuration of a light emitting device 10 according to the embodiment.
  • the light emitting device 10 includes a light emitting unit 110, a luminance detecting unit 120, and a control unit 130.
  • the light emitting unit 110 has a plurality of light sources 112.
  • Each light source 112 has a light emitting element.
  • an organic EL element or LED can be used.
  • the control unit 130 causes the light emitting unit 110 to emit light in either the bright mode or the dark mode.
  • the light emitting unit 110 emits light with a first light amount in the bright mode, and emits light with a second light amount smaller than the first light amount in the dark mode. In the dark mode, only some of the light sources 112 emit light. Note that the control unit 130 may have other light emission modes.
  • the luminance detector 120 detects the luminance of each of the plurality of light sources 112.
  • the control unit 130 selects the light source 112 that should emit light in the dark mode based on the detection result of the luminance detection unit 120 while the light emitting unit 110 is driven in the bright mode.
  • the control unit 130 sequentially switches the light source 112 to emit light during the dark mode. Then, the control unit 130 determines the relative ratio of the light emission times of the plurality of light sources 112 based on the detection result of the luminance detection unit 120. Specifically, the control unit 130 increases the relative ratio of the light emission times in each of the plurality of light sources 112 as the luminance by the luminance detection unit 120 increases. In the second mode, the control unit 130 may set all the light sources 112 as switching targets or only some of the light sources 112 as switching targets.
  • the luminance of the light emitting element decreases even under the same light emitting conditions (for example, voltage value and current value).
  • the amount of decrease in luminance increases as the power supplied to the light emitting element increases.
  • the brightness of each light source 112 is measured in the bright mode in which the amount of power is relatively large. For this reason, compared with the case where the brightness
  • the control unit 130 selects the light source 112 that should emit light in the dark mode based on the detection result of the luminance detection unit 120 while the light emitting unit 110 is driven in the bright mode. .
  • the control unit 130 selects the light source 112 having a relatively high luminance in the bright mode as the light source 112 that should emit light in the dark mode. For this reason, it can suppress that a difference arises in deterioration between the some light sources 112.
  • the control unit 130 increases the relative ratio of the light emission times in each of the plurality of light sources 112 as the luminance by the luminance detection unit 120 increases. In other words, the controller 130 increases the light emission time of the light source 112 as the luminance is higher and the deterioration is lower. For this reason, it can suppress that a difference arises in deterioration between the some light sources 112.
  • FIG. 1
  • FIG. 2 is a block diagram illustrating a functional configuration of the light emitting device 10 according to the first embodiment.
  • the light emitting device 10 operates in the first mode in the embodiment.
  • the light emitting device 10 further includes a luminance data storage unit 132.
  • the luminance data storage unit 132 stores the luminance measurement result by the luminance detection unit 120.
  • the light emitting device 10 is a lighting device.
  • the light mode of the light emitting unit 110 is the normal illumination mode, and the dark mode is the nightlight mode. Whether the light emitting unit 110 is driven in the bright mode or the dark mode is determined based on an input from the user.
  • the number of light sources 112 that should emit light in the dark mode is set in advance to be smaller than the number of light sources 112 that should emit light in the bright mode.
  • Each of the plurality of light sources 112 is a light-emitting panel and is formed on different substrates. However, each of the light emitting elements formed in different regions of the same substrate may be used as the light source 112.
  • control unit 130 causes all the light sources 112 to emit light at a predetermined current value in the bright mode.
  • luminance detecting unit 120 measures the luminance of each of the plurality of light sources 112 after a predetermined time has elapsed from the start of driving.
  • FIG. 3 is a diagram for explaining an example of the layout of the luminance detection unit 120.
  • the luminance detection unit 120 includes a plurality of luminance sensors 122.
  • the luminance sensor 122 overlaps the center of each of the plurality of light sources 112 in plan view. For this reason, the detection result of the luminance sensor 122 is a value that sufficiently reflects the luminance of the light source 112.
  • FIG. 4 is a diagram illustrating an example of data stored in the luminance data storage unit 132 in a table format.
  • identification information ID
  • the luminance data storage unit 132 stores the luminance measurement result of each light source 112 in association with the identification information of the light source 112.
  • the luminance stored in the luminance data storage unit 132 is, for example, a value indicating an integrated value of the measured luminance value.
  • the luminance data storage unit 132 stores a value obtained by averaging the measurement values of the luminance detection unit 120 for each light source 112.
  • the luminance data storage unit 132 may store all detection values of the luminance detection unit 120 in time series.
  • the luminance data storage unit 132 may store the latest detection value of the luminance detection unit 120.
  • the luminance detection unit 120 may measure only once after a predetermined time has elapsed after the light emitting unit 110 is installed at the installation location (for example, the ceiling).
  • FIG. 5 is a flowchart showing the operation of the control unit 130 when the light emitting unit 110 operates in the bright mode (normal light emitting mode).
  • the control unit 130 causes all the light sources 112 to emit light.
  • a first current (or a first voltage) is supplied to each of the light sources 112.
  • an instruction to output the detection result is transmitted to the luminance detection unit 120.
  • the control unit 130 receives the measurement values of the luminance of each of the plurality of light sources 112 from the luminance detection unit 120 (step S10)
  • the luminance data storage unit 132 uses the measurement values received from the luminance detection unit 120.
  • the stored data is updated (step S20).
  • FIG. 6 is a flowchart showing the operation of the control unit 130 when the light emitting unit 110 operates in the dark mode (nightlight mode).
  • the control unit 130 reads the data stored in the luminance data storage unit 132 (step S110), and selects the light source 112 that should emit light based on the read data (step S120). For example, the control unit 130 selects a predetermined number of light sources 112 in order of increasing luminance stored in the luminance data storage unit 132. Then, the control unit 130 causes the selected light source 112 to emit light (step S130). At this time, the control unit 130 supplies the selected light source 112 with a second current that is smaller than the current (first current) in the bright mode.
  • FIG. 7A is a diagram illustrating an example of a light emission pattern of the light emitting unit 110 when operating in the bright mode.
  • each of all the light sources 112 of the light emitting unit 110 emits light with the first brightness.
  • FIG. 7B is a diagram illustrating an example of a light emission pattern of the light emitting unit 110 when operating in the dark mode.
  • only one light source 112 (light source 112a) emits light.
  • the brightness of the light source 112a (second brightness) is darker than the first brightness (second brightness).
  • the control unit 130 supplies the selected light source 112 with a second current that is smaller than the current in the bright mode (first current).
  • the detection result of the luminance detection unit 120 when the light source 112 emits light in the dark mode is not suitable as an indicator of the progress of deterioration of the light emitting element.
  • the detection result of the luminance detection unit 120 when the light source 112 emits light in the bright mode is used as an indicator of deterioration of the light emitting element. For this reason, the deterioration amount of each of the plurality of light sources 112 can be determined with high accuracy. As a result, it is possible to sufficiently suppress variations in the deterioration amounts of the plurality of light sources 112.
  • control unit 130 makes the number of light sources 112 that should emit light in the dark mode smaller than the number of light sources 112 that should emit light in the bright mode. In this case, in the dark mode, it becomes easy to select only the light source 112 that has not deteriorated as the light source 112 to emit light. Thereby, it becomes easy to reduce the variation of the deterioration amount in the plurality of light sources 112. This effect is particularly great when the number of light sources 112 that should emit light in the dark mode is one.
  • FIG. 8 is a block diagram illustrating a functional configuration of the light emitting device 10 according to the second embodiment.
  • the light emitting device 10 according to this example is driven in the second mode in the embodiment.
  • the light emitting device 10 further includes a time calculation data storage unit 134 in addition to the light emitting device 10 of the first embodiment.
  • the time calculation data storage unit 134 stores data for determining the relative ratio of the light emission times of the light sources 112. This data may be, for example, a function or a table format.
  • FIG. 9 is a flowchart showing the operation of the control unit 130 when the light emitting unit 110 operates in the dark mode (nightlight mode) in this embodiment.
  • the operation of the light emitting unit 110 in the bright mode is the same as that in the first embodiment.
  • Control unit 130 reads data stored in luminance data storage unit 132 (step S210). Then, the control unit 130 calculates the relative ratio of the light emission times of the plurality of light sources 112 based on the read data and the data stored in the time calculation data storage unit 134.
  • the relative ratio may be determined according to a linear function with luminance as a variable, or may be determined according to a quadratic or higher order function with luminance as a variable.
  • control part 130 calculates the light emission time of each of the some light source 112 (step S220). For example, the control unit 130 calculates the light emission time of each of the plurality of light sources 112 by dividing a predetermined cycle time by the above-described relative ratio.
  • control unit 130 causes each of the plurality of light sources 112 to emit light sequentially while shifting the light emission timing (step S230). At this time, the control unit 130 controls the light emission time of each of the plurality of light sources 112 to the time calculated in step S220. Further, the control unit 130 causes the plurality of light sources 112 to sequentially emit a plurality of cycles as necessary.
  • FIG. 10 is a diagram for schematically explaining the control of the control unit 130 in step S230 of FIG.
  • the light emitting unit 110 has six light sources 112. These light sources 112 are arranged to form a matrix of 2 columns and 3 rows. Then, the control unit 130 selects one light source 112 as the light source 112a to emit light. The light source 112a is sequentially switched.
  • control unit 130 causes the light source 112 at the lower right in the drawing to emit light with the second brightness. Thereafter, the control unit 130 causes the light source 112 located at the center of the right column in the drawing to emit light with the second brightness. By repeating such an operation, the control unit 130 causes all the light sources 112 to emit light at the second brightness once. The control unit 130 repeatedly performs such control.
  • FIG. 11 is a diagram for explaining a first example of control by the control unit 130 in step 230 of FIG.
  • the control unit 130 causes the light source 112 to emit light in the order in which the calculated light emission time is short (that is, in the order of deterioration).
  • FIG. 12 is a diagram for explaining a second example of control by the control unit 130 in step 230 of FIG.
  • the control unit 130 causes the light source 112 to emit light in the order in which the calculated light emission time is long (that is, the order in which deterioration does not progress).
  • control unit 130 may cause two or more light sources 112 to emit light simultaneously. Also in this case, each of the light emission times of the plurality of light sources 112 is controlled as described above.
  • FIG. 13 is a diagram illustrating a layout of the luminance sensor 122 in the light emitting device 10 according to the third embodiment.
  • the light emitting device 10 according to the present embodiment has the same configuration as the light emitting device 10 according to the first or second embodiment, except for the layout of the luminance sensor 122.
  • the luminance sensor 122 does not overlap the light source 112 but is disposed around it. Specifically, the light sources 112 are arranged to form a matrix of m rows and n columns. The luminance sensor 122 is arranged to form a matrix of (m + 1) rows (n + 1) columns. One light source 112 is arranged in an area surrounded by four luminance sensors 122 adjacent to each other.
  • control unit 130 calculates the average value of the detection values of the adjacent luminance sensors 122 as the luminance of the light source 112.
  • Embodiment 1 or 2 the same effect as in Embodiment 1 or 2 can be obtained.
  • the effective value of the light emission area of the light source 112 is not reduced.
  • the arrangement of the luminance sensor 122 is not limited to the example shown in FIG. 13 as described below.
  • the luminance of the light source 112 is calculated as an average value of the luminance sensor 122 adjacent to the light source 112.
  • the luminance sensor 122 may be arranged so as to form a matrix of (m + 1) rows (n) columns.
  • one light source 112 is arranged between two luminance sensors 122 belonging to the same column and adjacent to each other.
  • the luminance sensor 122 may be arranged to form a matrix of (m) rows (n + 1) columns. In this case, one light source 112 is arranged between two luminance sensors 122 belonging to the same row and adjacent to each other.
  • the first luminance sensor 122 is arranged to form a matrix of (m + 1) rows (n) columns, and the second luminance sensor 122 is (m) rows (n + 1) columns. May be arranged so as to constitute a matrix.
  • the first luminance sensor 122 is shifted by half a row in the row direction and shifted by a half column in the column direction with respect to the second luminance sensor 122.
  • one light source 112 is arranged between two first luminance sensors 122 that belong to the same column and are adjacent to each other. In other words, one light source 112 is arranged between two luminance sensors 122 belonging to the same row and adjacent to each other.
  • the luminance sensor 122 positioned at the edge of the light emitting device 10 has fewer light sources 112 positioned around than the luminance sensor 122 positioned inside.
  • the luminance sensor 122 positioned at the center of the light emitting device master control unit 10 is not.
  • Four light sources 112 are located around. For this reason, when the several light source 112 which the light-emitting device 10 has lighted simultaneously, the detection value of the luminance sensor 122 located in the edge of the light-emitting device 10 will become relatively low.
  • the control unit 130 of the light emitting device 10 has a measurement mode.
  • the plurality of light sources 112 are sequentially turned on one by one. Then, the control unit 130 calculates the average value of the detection values of the luminance sensor 122 surrounding the light source 112 that is lit as the luminance of the light source 112.

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

Abstract

La présente invention concerne une unité électroluminescente (110) qui présente une pluralité de sources de lumière (112), chacune ayant un élément électroluminescent. Une unité de commande (130) amène ladite unité électroluminescente (110) à émettre de la lumière soit dans un mode éclairé, soit dans un mode tamisé. L'unité électroluminescente (110) émet une première quantité de lumière en mode éclairé et une seconde quantité de lumière en mode tamisé inférieure à la première quantité. En outre, en mode tamisé, seules certaines sources de lumière (112) émettent de la lumière. Une unité de détection de luminance (120) détecte la luminance de chaque source de lumière (112). Dans un premier mode, l'unité de commande (130) sélectionne les sources de lumière (112) à allumer en mode tamisé en fonction des luminances détectées par l'unité de détection de luminance (120) tandis que l'unité électroluminescente (110) est en mode éclairé.
PCT/JP2012/082807 2012-12-18 2012-12-18 Dispositif électroluminescent et procédé de commande d'un dispositif électroluminescent WO2014097397A1 (fr)

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PCT/JP2012/082807 WO2014097397A1 (fr) 2012-12-18 2012-12-18 Dispositif électroluminescent et procédé de commande d'un dispositif électroluminescent

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11701999B2 (en) 2020-03-31 2023-07-18 Yamaha Hatsudoki Kabushiki Kaisha Light emitting device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4976605B1 (ja) * 2011-08-31 2012-07-18 パイオニア株式会社 照明装置
WO2012164683A1 (fr) * 2011-05-31 2012-12-06 パイオニア株式会社 Appareil d'éclairage et procédé de commande de la luminosité

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012164683A1 (fr) * 2011-05-31 2012-12-06 パイオニア株式会社 Appareil d'éclairage et procédé de commande de la luminosité
JP4976605B1 (ja) * 2011-08-31 2012-07-18 パイオニア株式会社 照明装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11701999B2 (en) 2020-03-31 2023-07-18 Yamaha Hatsudoki Kabushiki Kaisha Light emitting device

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