WO2011070907A1 - 照明装置 - Google Patents
照明装置 Download PDFInfo
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- WO2011070907A1 WO2011070907A1 PCT/JP2010/070784 JP2010070784W WO2011070907A1 WO 2011070907 A1 WO2011070907 A1 WO 2011070907A1 JP 2010070784 W JP2010070784 W JP 2010070784W WO 2011070907 A1 WO2011070907 A1 WO 2011070907A1
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- 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
- H10K59/80—Constructional details
- H10K59/86—Series electrical configurations of multiple OLEDs
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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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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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]
- H05B45/60—Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED]
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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]
- H05B45/10—Controlling the intensity of the light
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- 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 an illumination device in which a plurality of OLEDs (Organic Light Emitting Diodes) are arranged.
- OLEDs Organic Light Emitting Diodes
- a lighting device that emits light by rectifying commercial power by half-wave rectification using a plurality of single OLED devices connected in series as a light source is conventionally known (see, for example, Patent Document 1).
- a plurality of single OLED devices are connected in series to form an OLED unit, a plurality of OLED units connected to a commercial power source are driven with alternating current, and the plurality of OLED units are sequentially turned on / off by a switch and turned on.
- an illuminating device in which the luminance is variable by increasing or decreasing the number (for example, see Patent Document 2).
- the brightness of the light source consisting of a single OLED device is increased or decreased by controlling the DC voltage value at high brightness and by PWM (Pulse / Width / Modulation) control of the DC pulse voltage at low brightness.
- PWM Pulse / Width / Modulation
- the illumination device described in Patent Document 1 has a problem that although the drive power supply can be simplified, the luminance of the light source cannot be increased or decreased (hereinafter also referred to as dimming) because it is intended for illumination with a constant luminance.
- the lighting device described in Patent Document 2 requires a switching unit for each of a plurality of OLED units, and requires a combination of an extremely large number of OLED units and switching units to smooth the change in luminance. It is complicated and not practical, and there is a problem that if the number of combinations of the OLED unit and the switching means is reduced, sufficient light control as an illumination device cannot be performed.
- the present invention can improve the dimming accuracy of the luminance of a light source composed of a plurality of OLED devices, and can reduce the luminance difference due to variations in individual characteristics, giving the user an uncomfortable feeling.
- the object is to provide no lighting device.
- the drive power source includes a pulse generation unit that generates a pulse with a duty ratio according to luminance command information for instructing luminance to be emitted to the OLED unit;
- An OLED driving unit for causing the OLED unit to emit light in response to the pulse generated by the pulse generating unit;
- a switching unit for switching, An illuminating device comprising: an OLED light emission stopping unit configured to stop light emission of the OLED unit by the second voltage source when the pulse is turned off.
- the luminance command information is information relating to luminance that continuously increases or decreases continuously.
- the voltage source is a power source capable of outputting a voltage value at which all of a plurality of OLED devices connected in series can obtain a practical maximum luminance.
- the current source is a power source capable of outputting a current value at which all of a plurality of OLED devices connected in series can obtain a practical maximum luminance.
- the second voltage source is a power source capable of outputting a voltage lower than a light emission start voltage of an OLED device having the lowest light emission start voltage among a plurality of OLED devices connected in series. 5.
- the lighting device according to any one of items 1 to 4.
- an illuminating device that can improve the dimming accuracy of the luminance of a light source composed of a plurality of OLED devices and can reduce the luminance difference due to variation in individual characteristics without causing discomfort to the user. can do.
- FIG. 6 is an explanatory diagram schematically showing outputs of respective units of the drive power supply 4. It is explanatory drawing when the output of the pulse generation part 42 is low level Lo when the output voltage of the brightness
- FIG. 1 is a cross-sectional configuration diagram of an OLED device.
- a transparent electrode 12 serving as an anode, an organic layer 13 serving as a light emitting portion, and a metal film layer 14 serving as a cathode are laminated in this order on the surface of a transparent substrate 11 serving as a base material.
- the power source 2 is connected to the electrode 12 and the metal film layer 14.
- the transparent substrate 11 is made of transparent glass or resin material having a thickness of about 1 mm in order to transmit light generated in the organic layer 13, and the transparent electrode 12 serving as an anode has conductivity and transmits light. It is made of ITO (Indium / Tin / Oxide) or IZO (Indium / Zinc / Oxide) having a thickness of about 100 nm.
- the organic layer 13 has a thickness of about 100 nm, and a hole injection layer (40 nm), a hole transport layer (20 nm), a light emitting layer (30 nm), a hole blocking layer (10 nm) and an electron transport layer ( 30 nm).
- the metal film layer 14 serving as a cathode is composed of a thin film such as aluminum or silver having a thickness of about 150 nm.
- the organic layer 13 which is a light emitting layer, recombination of holes and electrons occurs, and a light emission phenomenon occurs when excitons generated thereby shift from an excited state to a ground state.
- the light 15 generated in the organic layer 13 passes through the transparent electrode 12 and the transparent substrate 11 and reaches the outside.
- dimming increasing or decreasing the luminance of the light source (single or plural OLED devices) is referred to as dimming.
- FIG. 2 is an explanatory diagram of an OLED unit in which a plurality of OLED devices are arranged.
- an array of a plurality of single OLED devices is referred to as an OLED unit.
- the lighting device of the present invention has an OLED unit 3 and a driving power source 4 for driving the OLED unit 3.
- the OLED unit 3 used for the illuminating device of the present invention is a single transparent substrate in which a plurality of OLED devices 1 described with reference to FIG. 1 are arranged in series, and the transparent electrode of the first OLED device 1a is provided. Connected to the metal film layer of the second OLED device 1b, the transparent electrode of the second OLED device 1b is connected to the metal film layer of the third OLED device 1c, and the transparent electrode of the third OLED device 1c is the fourth Connected to the metal film layer of the OLED device 1d.
- a plurality of OLED devices 1 are connected in series by connecting the metal film layers of adjacent OLED devices and transparent electrodes.
- the metal film layer (cathode) of the first OLED device 1a is connected to the cathode of the drive power supply 4, and the transparent electrode (anode) of the fourth OLED device 1d is connected to the anode of the drive power supply 4 that drives the OLED unit.
- the plurality of OLED devices emit light.
- the drive power supply 4 drives the OLED unit 3 in a pulse manner as will be described later.
- the first OLED device 1a, the second OLED device 1b, the third OLED device 1c, and the fourth OLED device 1d have a planar shape and are arranged substantially in parallel.
- Each OLED device has a size of, for example, about 15 mm ⁇ 150 mm and emits surface light.
- each OLED device is generally indicated by a resistor r, a diode d (light emitting unit) connected in series to the resistor r, and a capacitance c connected in parallel to the diode d.
- the capacitance c is large, for example, several ⁇ F because the area of the OLED device is large, and the capacitance of the OLED unit 3 in which, for example, four OLED devices 1 are connected in series is also large, for example, approximately 1 ⁇ F.
- individual OLED devices may be connected in series with lead wires, or a plurality of OLED devices may be connected in series by directly contacting the metal film layer of the adjacent OLED device and the transparent electrode.
- a plurality of OLED units 3 described above can be connected in series or in parallel to be used as a large illuminating device, and a large illuminating device is arranged on a ceiling or a wall surface to illuminate a room or the like as a whole. It becomes possible.
- FIG. 3 is an explanatory diagram schematically showing an example of a transient phenomenon when the OLED device is pulse-driven.
- the horizontal axis indicates time t
- the vertical axis indicates voltage Ed (Ed ') applied to the OLED device.
- Ed ' voltage Ed
- FIGS. 3 (a) and 3 (b) show a transient phenomenon when a current source is connected to the OLED device 1 and the OLED device 1 is pulse-driven by current
- FIGS. 3 (c) and 3 (d) Shows a transient phenomenon when a voltage source is connected to the OLED device 1 and the OLED device 1 is pulse-driven by voltage.
- the voltage Ed rises with a slope ⁇ 1 from t 0 when the power is turned on, reaches the power supply voltage at 25% (t 25 ) of the period T, and then reaches 50 The voltage is maintained until it is turned OFF at% (t 50 ).
- the current source has a large system time constant expressed by the product of the internal resistance and the capacitance c of the OLED device 1, and the slope ⁇ 1 when the voltage Ed rises is small, that is, when the current source is pulse-driven, it rises. Becomes dull.
- the voltage Ed cannot reach the power supply voltage and becomes darker with respect to the original brightness and the brightness perceived by the person. End up.
- a pulse drive is attempted with a duty ratio of about 10% (t 10 ) of the period T, a pulse of a triangular wave is generated, which greatly deviates from the luminance that should be originally intended and the brightness perceived by humans. The desired brightness cannot be obtained.
- the voltage Ed ′ rises with a slope ⁇ 2 from t 0 when the power is turned on, reaches the power supply voltage at 5% (t 5 ) of the period T, The voltage is maintained until it is turned OFF at 50% (t 50 ).
- the voltage source has a small system time constant represented by the product of the internal resistance and the capacitance c of the OLED device 1, and the slope ⁇ 2 at the rise of the voltage Ed ′ is larger than the slope ⁇ 1 described above.
- the rise is sharper than in the case of pulse driving with a current source.
- the voltage Ed reaches the power supply voltage and the brightness that human beings should feel or the brightness that humans feel. Therefore, for example, it is possible to prevent the brightness from being deviated greatly from the brightness that should be originally felt or the brightness perceived by a person up to a duty ratio of about 5% of the period T (t 5 ). Can be improved and desired luminance can be obtained.
- the individual OLED devices 1 have variations in the lowest voltage value (hereinafter referred to as the light emission start voltage) at which light emission can be visually recognized.
- the luminance-current characteristic is almost proportional, and if the high luminance region is driven with a current pulse, the luminance difference due to the characteristic variation of each OLED can be reduced.
- the voltage source should be used to drive the pulse during low luminance (low duty ratio) so that the luminance and brightness perceived by humans do not deviate significantly from the target luminance, that is, the duty ratio.
- pulse driving is performed with a current source.
- FIG. 4 is a configuration diagram of a driving power source for driving the OLED unit.
- arrows indicate the signal flow.
- the luminance command unit 41 is provided outside the drive power supply 4 indicated by a one-dot chain line, and commands the luminance of the OLED unit 3 and outputs luminance command information that is a voltage corresponding to the luminance. For example, when the luminance is continuously increased or decreased as in the case of dimming when the lighting device is turned ON / OFF, a voltage that increases or decreases continuously is output.
- the drive power supply 4 integrates a pulse generation unit 42 that outputs a pulse with a duty ratio corresponding to the output voltage of the luminance command unit 41, and a time during which the pulse output from the pulse generation unit 42 is ON.
- the integration unit 43 that outputs a voltage according to the integration result
- the comparison unit 44 that compares the output voltage of the integration unit 43 with a preset threshold voltage
- a constant current that is a current source that drives the OLED unit 3
- the switching unit (not shown) includes the switch SW1, the switch SW2, and the comparison unit 44.
- the duty ratio is increasing, the voltage source is less than the second threshold value that is higher than the preset first threshold value.
- the OLED unit 3 is caused to emit light by the (constant voltage source 46), and the OLED unit 3 is switched to emit light by the current source (constant current source 45) when the second threshold value or more is reached.
- the constant current source 45 causes the OLED unit 3 to emit light above the first threshold, and when the duty ratio falls below the first threshold, the constant voltage source 46 causes the OLED unit 3 to emit light. ing.
- the constant current source 45 and the constant voltage source 46 may be switched in a region where the duty ratio is low as described above.
- the problem of voltage drop of the current source 45 tends to become more prominent when the duty ratio increases than when it decreases, and there is a tendency for the voltage drop problem to occur at higher duty ratios.
- the problem of the voltage drop of the constant current source 45 in the region where the duty ratio is low has hysteresis with respect to the duty ratio. Therefore, when the duty ratio increases, switching is performed with a higher threshold than when the duty ratio decreases. I am doing so.
- the constant current source 45 and the constant voltage source 46 may use DC power supplied from converter means for converting AC power supplied from a commercial AC power source into DC power. included.
- the switch SW4 and the second constant voltage source 47 constitute an OLED light emission stop unit.
- the switch SW3 corresponds to an OLED drive unit that causes the OLED unit 3 to emit light in response to a pulse generated by the pulse generator 42.
- the constant voltage source 46 is preferably a DC power source capable of outputting a voltage value at which all of the plurality of OLED devices 1 constituting the OLED unit 3 can obtain a practical maximum luminance in order to further improve the dimming accuracy.
- states of the switches SW1 and SW2 shown indicate when the output of the comparison unit 44 is at the high level Hi, and the states of the switches SW3 and SW4 indicate when the pulse of the pulse generation unit 42 is at the high level Hi. .
- switches SW1 to SW4 may not be mechanical contacts like the illustrated relays but may be purely electrical switching circuits.
- the pulse generating unit 42 is connected to the output side of the luminance command unit 41, the integrating unit 43, the switch SW3, and the switch SW4 are connected to the output side of the pulse generating unit 42, and the comparing unit 44 is connected to the output side of the integrating unit 43. Are connected, and the switch SW1 and the switch SW2 are connected to the output side of the comparison unit 44.
- a constant current source 45 is connected to one of the contacts 44a of the switch SW1, and one of the contacts 44b of the switch SW2 and 42a of the switch SW3 is connected to the other, and a constant voltage source is connected to the other of the contacts 44b of the switch SW2. 46 is connected.
- the other side of the contact 42a of the switch SW3 is connected to one of the contact 42b of the OLED unit 3 and the switch SW4, and the second constant voltage source 47 is connected to the other side of the contact 42b of the switch SW4.
- FIG. 5 is an explanatory diagram schematically showing the output of each part of the drive power supply 4.
- FIG. 5A shows the output of the luminance command unit 41
- FIG. 5B shows the output of the pulse generation unit 42
- FIG. 5C shows the output of the integration unit 43
- FIG. The output of the comparison unit 44 is shown.
- the brightness command unit 41 is operated by a manual brightness setting circuit 411 for adjusting the brightness by the user and an ON / OFF switch (not shown) of the lighting device, so that the output voltage Eo is changed from 0 V when ON as shown in FIG.
- the voltage is continuously increased to a voltage corresponding to the practical maximum luminance of the lighting device, and the voltage is maintained until OFF, and when OFF, the voltage corresponding to the practical maximum luminance of the lighting device is continuously decreased from 0V to 0V.
- An automatic brightness setting circuit 412 is provided.
- the practical maximum brightness refers to the maximum brightness at which the OLED device can continuously emit light without causing an abnormality.
- an arbitrary voltage set by the manual brightness setting circuit 411 is output.
- the automatic brightness setting for example, when the lighting device is turned on / off, a voltage whose output changes continuously with time or linearly with respect to time is output from the automatic brightness setting circuit 412.
- the pulse generator 42 includes a PWM (Pulse / Width / Modulation) unit 421 that performs pulse width modulation of a pulse having a predetermined frequency in accordance with the output voltage of the luminance command unit 41.
- PWM Pulse / Width / Modulation
- the pulse P PWM that is pulse-width modulated in accordance with the output voltage of the luminance command unit 41 is output to the integration unit 43, the switch SW3, and the switch SW4. Therefore, when a voltage that continuously increases or decreases is input from the luminance command unit 41, a pulse P PWM whose duty ratio continuously increases or decreases is output as shown in FIG.
- the integrator 43 has an integrator 431, and the integrator 431 integrates the time during which the pulse PPWM is ON. Specifically, the sum of ON times per unit time of pulses output from the pulse generator 42 is sequentially calculated (integrated) in a moving average manner, and an output voltage E int proportional to the calculated (integrated) value is output.
- Comparing unit 44 has a comparator 442 for comparing the first threshold 1sh and and the storage unit 441 stores a second threshold value 2sh, the first threshold 1sh and second threshold 2sh the output voltage E int ing.
- the first threshold value 1sh is a threshold value for switching the driving of the OLED unit 3 from the constant current source 45 to the constant voltage source 46 when the luminance is decreased, and the luminance cannot be changed continuously by the driving with the constant current source 45. Is set in advance by a voltage obtained by multiplying the output voltage of the luminance command unit 41 by a constant and a predetermined margin voltage.
- the second threshold 2sh is set to a voltage higher than the first threshold 1sh, and is a threshold for switching the driving of the OLED unit 3 from the constant voltage source 46 to the constant current source 45 when the luminance increases.
- the voltage is set in advance by adding a predetermined margin voltage to a voltage obtained by multiplying a constant by the output voltage of the luminance command unit 41, in which the luminance cannot be changed continuously by driving at.
- the comparison unit 44 reads the first threshold value 1 sh and the second threshold value 2 sh from the storage unit 441, and the comparator 442 outputs the first threshold voltage to the output voltage E int .
- the threshold value 1sh is compared with the second threshold value 2sh.
- the output voltage E int becomes equal to or higher than the second threshold 2sh while the luminance is increasing, the output becomes the high level Hi, and the output voltage E int is the first voltage while the luminance is decreasing.
- the threshold value is less than 1 sh, the output becomes a low level Lo.
- the switching unit (not shown) that switches the power source for causing the OLED unit to emit light is configured by the comparison unit 44, the switch SW1, and the switch SW2, and when the duty ratio is increasing, the second threshold value is higher than the first threshold value 1sh that is set in advance. If it is less, the OLED unit 3 is caused to emit light by the voltage source (constant voltage source 46), and if it is greater than or equal to the second threshold value, the OLED unit 3 is caused to emit light by the current source (constant current source 45). Yes.
- the OLED unit 3 is caused to emit light by the constant current source 45 if the first threshold value is 1sh or more, and the OLED unit 3 is caused to emit light by the constant voltage source 46 if it is less than the first threshold value 1sh. It is supposed to switch to.
- the constant current source 45 a commercially available constant current power supply can be used, and it is desired that the lighting device is bright. Therefore, the constant current source 45 is configured so that all of the plurality of OLED devices connected in series have the maximum practical brightness. It is more preferable to use a DC power supply that can output a current value that can be obtained.
- the practical maximum brightness refers to the maximum brightness at which the OLED device can continuously emit light without causing an abnormality as described above.
- the constant voltage source 46 a commercially available constant voltage power supply can be used, and in order to further improve the dimming accuracy, a voltage value at which all of the plurality of OLED devices 1 constituting the OLED unit 3 can obtain a practical maximum luminance is output. Use a direct current power supply.
- the voltage is always output to the contact 44b of the switch SW2.
- the switch SW1 closes the contact 44a when the output of the comparison unit 44 is ON (Hi), so that the output of the constant current source 45 can be supplied to the OLED unit 3. Further, the switch SW2 closes the contact 44b when the output of the comparison unit 44 is OFF (Lo) so that the output of the constant voltage source 46 can be supplied to the OLED unit 3.
- the OLED unit 3 when the output of the comparison unit 44 is ON (Hi), that is, when the luminance specified by the luminance command unit 41 is high, the OLED unit 3 can be driven by the constant current source 45 by the switch SW1, and the output of the comparison unit 44 is OFF ( In the case of Lo), that is, when the luminance designated by the luminance command unit 41 is low, the OLED unit 3 can be driven by the constant voltage source 46 by the switch SW2.
- the switch SW3 is output pulse P PWM pulse generating section 42 is to be supplied only to the output of the close contact 42a constant current source 45 or the constant voltage source 46 at a high level Hi in OLED unit 3.
- the switch SW4 is output pulse P PWM pulse generating section 42 is capable of supplying the output of the second constant voltage source 47 by closing the only contact 42b at a low level Lo to the OLED unit 3.
- the second constant voltage source 47 is a power source for surely turning off the OLED unit 3 and will be described later.
- the output voltage value of the second constant voltage source 47 may be a value that can reliably turn off the OLED unit 3 as described above, and the light emission start voltage of the plurality of OLED devices connected in series is sufficient. It is a value lower than the emission start voltage of the lowest OLED device.
- the lowest emission start voltage is + 4V, it may be + 3V to 0V.
- a reverse bias voltage may be applied to the OLED unit 3 in order to surely turn off the OLED unit 3.
- it is less than 0V, preferably -2V to -3V. To do.
- the output of the constant current source 45 or the constant voltage source 46 is converted to a pulse having a duty ratio corresponding to the output of the luminance command unit 41 by the switch SW3, and when the pulse is at a low level, the voltage of the second constant voltage source 47 is switched by the switch SW4. Is applied so that the OLED unit 3 can be reliably turned off (extinguished) during pulse driving.
- FIG. 6 is an explanatory diagram when the output of the pulse generator 42 is at a low level Lo when the output voltage of the luminance command unit 41 is still low.
- FIG. 7 shows the luminance when the output voltage of the luminance command unit 41 is still low. It is explanatory drawing which represented typically the output of each part in increase.
- FIG. 7 (a) shows the output of the luminance command unit 41
- FIG. 7 (b) shows the output of the pulse generator 42
- FIG. 7 (c) shows the output of the integrator 43
- FIG. The output of the comparison unit 44 is shown.
- the output pulse P PWM of the pulse generation unit 42 is input to the integration unit 43, and the output voltage E int of the integration unit 43 that calculates the output pulse P PWM with a small duty ratio is also low as shown in FIG. Become.
- the comparison section 44 reads the first threshold 1sh and second threshold 2sh from the storage unit 44, for example a first threshold 1sh the output voltage E int of the integration unit 43 that is input in the increase in luminance
- the second threshold value 2sh is compared.
- the output voltage E int of the integrating unit 43 is low and less than the first threshold value 1sh, so that the output of the comparing unit 44 is at the low level Lo as shown in FIG.
- the comparison unit 44 outputs a low level Lo when the output voltage E int of the input integration unit 43 is low and less than the second threshold value 2sh while the luminance is increasing. (If the input output voltage E int of the integration unit 43 is high and becomes equal to or higher than the second threshold 2sh, a high level Hi is output.) Since the output of the comparison unit 44 is at the low level Lo, the switch SW2 is turned ON to close the contact 44b, the switch SW1 is turned OFF to open the contact 44a, and the power of the constant voltage source 46 can be supplied to the OLED unit 3.
- the output pulse PPWM of the pulse generator 42 is input to the switch SW3 and the switch SW4.
- the switch SW4 is turned on and the switch SW3 is turned off while the input output pulse PPWM is at the low level Lo.
- switch SW3 is ON (switch SW4 is OFF) while the output pulse PPWM is at the high level Hi, and the switch SW4 is ON (switch SW3 is OFF) while the output pulse PPWM is at the low level Lo.
- the switch SW3 Since the switch SW3 is OFF, the power supply from the constant voltage source 46 is cut off, and since the switch SW4 is ON, the voltage described above is supplied from the second constant voltage source 47 to the OLED unit 3 and the OLED unit 3 is reliably turned off. Is done.
- FIG. 8 is an explanatory diagram when the output of the pulse generator 42 is at the high level Hi when the output voltage of the luminance command unit 41 is still low.
- the switch SW2 is turned on and the contact 44b is closed, the switch SW1 is turned off and the contact 44a is opened, and the power of the constant voltage source 46 can be supplied to the OLED unit 3.
- the output pulse PPWM of the pulse generator 42 is input to the switch SW3 and the switch SW4.
- the switch SW3 is ON and the switch SW4 is OFF while the input output pulse PPWM is at the high level Hi.
- the OLED unit 3 when the output voltage of the luminance command unit 41 is still low, that is, when the set luminance is low, the OLED unit 3 is pulse-driven by the voltage source at a low duty ratio, Can be reliably turned on by the constant voltage source 46 when ON, and can be reliably turned off by the second constant voltage source 47 when the pulse is OFF.
- FIG. 9 is an explanatory diagram when the output of the pulse generator 42 is at a low level Lo when the output voltage of the luminance command unit 41 becomes high, and FIG. 10 shows when the output voltage of the luminance command unit 41 becomes high. It is explanatory drawing which represented typically the output of each part in which the brightness
- FIG. 10 (a) shows the output of the luminance command unit 41
- FIG. 10 (b) shows the output of the pulse generator 42
- FIG. 10 (c) shows the output of the integrator 43
- FIG. The output of the comparison unit 44 is shown.
- the output pulse P PWM of the pulse generation unit 42 is input to the integration unit 43, and the output voltage E int of the integration unit 43 that calculates the output pulse P PWM having a large duty ratio is also high as shown in FIG. Become.
- the comparison unit 44 reads the first threshold value 1sh and the second threshold value 2sh from the storage unit 441, and, for example, with respect to the output voltage E int of the integration unit 43 input during the increase in luminance, The second threshold value 2sh is compared.
- the input output voltage E int of the integration unit 43 is high and is equal to or higher than the second threshold value 2sh, it is assumed that the output of the comparison unit 44 is at a high level Hi as shown in FIG. .
- the comparison unit 44 outputs a high level Hi when the output voltage Eint of the input integration unit 43 is high and exceeds the second threshold value 2s while the luminance is increasing. (If the input output voltage E int of the integration unit 43 is low and less than the second threshold 2sh, the low level Lo is output.) Since the output of the comparison unit 44 is at the high level Hi, the switch SW2 is turned off and the contact 44b is opened, the switch SW1 is turned on and the contact 44a is closed, and the power of the constant current source 45 can be supplied to the OLED unit 3.
- the output pulse PPWM of the pulse generator 42 is input to the switches SW3 and SW4.
- the operations of the switch SW3, the switch SW4, and the second constant voltage source 47 are the same as those described with reference to FIG.
- the power supply from the constant current source 45 is cut off because the switch SW3 is OFF, and the voltage described above is supplied from the second constant voltage source 47 to the OLED unit 3 because the switch SW4 is ON. It is turned off reliably.
- FIG. 4 shows a state in which the output of the pulse generator 42 is at the high level Hi when the output voltage of the luminance command unit 41 becomes high.
- the switch SW2 is turned off and the contact 44b is opened, the switch SW1 is turned on and the contact 44a is closed, and the power of the constant current source 45 can be supplied to the OLED unit 3.
- the output pulse PPWM of the pulse generator 42 is input to the switch SW3 and the switch SW4.
- the operations of the switch SW3, the switch SW4, and the second constant voltage source 47 are the same as those described with reference to FIG.
- the OLED unit 3 is pulse-driven with a high duty ratio by a current source,
- the constant current source 45 can reliably turn on the light
- the pulse is off the second constant voltage source 47 can surely turn off the light.
- the integration unit 43 of the above embodiment is not an essential configuration, and the output of the pulse generation unit 42 is directly input to the comparison unit 44, and the duty ratio of the input output pulse P PWM and the first threshold value or the second threshold value are input.
- the constant voltage source 46 and the constant current source 45 may be switched by comparing with a threshold value.
- the brightness is not continuously increased or decreased continuously to adjust the light, but is set by a manual brightness setting mechanism that can be adjusted to a desired brightness by a dial or the like.
- the duty ratio is set so that the desired brightness value is obtained, and when dimming by increasing the brightness, the duty ratio is compared with the second threshold value, and when dimming by decreasing the brightness, the duty ratio is set.
- the first threshold value may be compared, and dimming may be performed by switching between the constant current source and the constant voltage source according to the comparison result.
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Abstract
Description
該駆動電源は、前記OLEDユニットに発光させる輝度を指令する輝度指令情報に応じたデューティー比のパルスを発生するパルス発生部と、
前記パルス発生部で発生させた前記パルスに応じて前記OLEDユニットをパルス発光させるOLED駆動部と、
前記パルスのON時に、前記OLEDユニットを発光させる電圧源と前記OLEDユニットを発光させる電流源と、
前記デューティー比が増加中は、予め設定した第1の閾値より高い第2の閾値未満であれば前記電圧源により前記OLEDユニットを発光させ、第2の閾値以上となると前記電流源により前記OLEDユニットを発光させるように切り替え、前記デューティー比が減少中は前記第1の閾値以上では前記電流源により前記OLEDユニットを発光させ、前記第1の閾値未満となると前記電圧源により前記OLEDユニットを発光させるように切り替える切替部と、
前記パルスのOFF時に、第2の電圧源によりOLEDユニットを発光停止させるOLED発光停止部と、を有することを特徴とする照明装置。
比較部44の出力がローレベルLoのためスイッチSW2がONとなり接点44bを閉じ、スイッチSW1がOFFとなり接点44aを開き、定電圧源46の電力をOLEDユニット3に供給可能とする。
比較部44の出力がハイレベルHiのためスイッチSW2がOFFとなり接点44bを開き、スイッチSW1がONとなり接点44aを閉じ、定電流源45の電力をOLEDユニット3に供給可能とする。
3 OLEDユニット
4 駆動電源
11 透明基板
12 透明電極
13 有機層
14 金属膜層
41 輝度指令部
42 パルス発生部
42a 接点
42b 接点
43 積分部
44 比較部
44a 接点
44b 接点
45 定電流源
46 定電圧源
47 第2の定電圧源
Claims (5)
- 単一のOLEDデバイスを複数直列に接続したOLEDユニットをパルス駆動する駆動電源を有する照明装置において、
該駆動電源は、前記OLEDユニットに発光させる輝度を指令する輝度指令情報に応じたデューティー比のパルスを発生するパルス発生部と、
前記パルス発生部で発生させた前記パルスに応じて前記OLEDユニットをパルス発光させるOLED駆動部と、
前記パルスのON時に、前記OLEDユニットを発光させる電圧源と前記OLEDユニットを発光させる電流源と、
前記デューティー比が増加中は、予め設定した第1の閾値より高い第2の閾値未満であれば前記電圧源により前記OLEDユニットを発光させ、第2の閾値以上となると前記電流源により前記OLEDユニットを発光させるように切り替え、前記デューティー比が減少中は前記第1の閾値以上では前記電流源により前記OLEDユニットを発光させ、前記第1の閾値未満となると前記電圧源により前記OLEDユニットを発光させるように切り替える切替部と、
前記パルスのOFF時に、第2の電圧源によりOLEDユニットを発光停止させるOLED発光停止部と、を有することを特徴とする照明装置。 - 前記輝度指令情報が、連続的に増加又は連続的に減少する輝度に係る情報であることを特徴とする請求項1に記載の照明装置。
- 前記電圧源は、直列に接続された複数のOLEDデバイスの全てが実用最大輝度を得られる電圧値を出力可能な電源であることを特徴とする請求項1又は2に記載の照明装置。
- 前記電流源は、直列に接続された複数のOLEDデバイスの全てが実用最大輝度を得られる電流値を出力可能な電源であることを特徴とする請求項1~3のいずれか1項に記載の照明装置。
- 前記第2の電圧源は、直列に接続された複数のOLEDデバイスのうち、発光開始電圧の一番低いOLEDデバイスの発光開始電圧より低い電圧を出力可能な電源であることを特徴とする請求項1~4のいずれか1項に記載の照明装置。
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JP2011545161A JP5578182B2 (ja) | 2009-12-11 | 2010-11-22 | 照明装置 |
US13/514,316 US8710748B2 (en) | 2009-12-11 | 2010-11-22 | Illumination apparatus |
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Cited By (2)
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WO2013041088A3 (de) * | 2011-09-23 | 2013-05-23 | Novaled Ag | Verfahren zum betreiben einer lichtemittierenden vorrichtung und anordnung |
JP2013186946A (ja) * | 2012-03-05 | 2013-09-19 | Nec Lighting Ltd | 有機el素子のショート故障検出方法および検出回路 |
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TWI475541B (zh) * | 2012-09-21 | 2015-03-01 | Chunghwa Picture Tubes Ltd | 有機發光二極體顯示裝置 |
KR102315419B1 (ko) * | 2014-10-21 | 2021-10-22 | 삼성디스플레이 주식회사 | 유기전계발광 표시장치 |
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JPWO2011070907A1 (ja) | 2013-04-22 |
US20120242233A1 (en) | 2012-09-27 |
US8710748B2 (en) | 2014-04-29 |
JP5578182B2 (ja) | 2014-08-27 |
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