WO2015140161A1 - Method for controlling an organic light emitting component and organic light emitting component - Google Patents

Abstract

The invention relates to a method for controlling an organic light emitting component (100), in which the organic light emitting component (100), when in operation, emits a mixed light (101) with a white colour impression for producing a colour temperature and a brightness, the colour temperature increasing when the brightness is increased and the colour temperature reducing when the brightness is reduced. The invention also relates to an organic light-emitting component (100).

Description

description

Method for controlling an organic light emitting device and organic light emitting device

This patent application claims the priority of German Patent Application 10 2014 103 754.5, the disclosure of which is hereby incorporated by reference.

There will be a method for controlling an organic light-emitting device and an organic light

specified emitting element.

At least one object of certain embodiments is to provide a method for controlling an organic light-emitting component, in which the organic light-emitting component radiates mixed light. At least another object of certain embodiments is to provide an organic light emitting device for

Indicate radiation of mixed light.

These tasks are performed by a procedure and a

Subject matter solved according to the independent claims. Advantageous embodiments and further developments of

Procedure and object are in the dependent

Claims and continue to go from the

following description and the drawings.

According to at least one embodiment is at a

Method of controlling an organic light-emitting device so controlled that it in operation

Mixed light radiates. Here and below may be "light" in particular

electromagnetic radiation with one or more

Wavelengths or wavelength ranges from one

denote ultraviolet to infrared spectral range. In particular, light can be visible light and

 Wavelengths or wavelength ranges from a visible spectral range between about 380 nm and about 750 nm

include. Visible light can be here and below

For example, be characterized by its color locus with cx and cy color coordinates according to the known so-called CIE-1931 Farborttafel or CIE standard color chart. By "mixed light" is here and in the following called light, not

monochromatic and thus monochromatic, but has at least two different spectral components.

In particular, the organic light emitting

Component in operation a mixed light with a white

Blend color impression. As white light or light with a white light or color impression here and in the following can light with a

Color locus corresponding to the color locus of a Planck blackbody radiator or by less than 0.23 and preferably less than 0.07 in cx and / or cy color coordinates from the color locus of a Planck

 Blackbody radiator deviates. Furthermore, a here and hereinafter referred to as white luminous impression

Luminous impression are caused by light, which has a color rendering index (CRI) known to the expert of greater than or equal to 60, preferably greater than or equal to 80 and more preferably greater than or equal to 90. Furthermore, as "warm white" here and in

Below a light impression be designated, the one Color temperature of less than or equal to 4000 K, which may also be referred to as "neutral white", and preferably less than or equal to 3500 K. Further, as a warm white color temperature, a color temperature less than or equal to the above values and greater than or equal to 2000 K and particularly preferably greater than or equal to 2700 K. As "cool white" can here and below be designated a white luminous impression, which has a color temperature of greater than 5500 K. The term "color temperature" may here and below denote the color temperature of a Planck 'blackbody radiator or also the so-called correlated color temperature (CCT) known to those skilled in the art in the case of a white

Luminous impression in the sense described above, by

Color coordinates that deviate from the chromaticity coordinates of Planck's blackbody radiators can be characterized.

In particular, the mixed light emitted during operation of the organic light emitting device can emit a white color impression to produce a

Color temperature and a brightness. In particular, the method is performed such that the brightness and the

Color temperature, which are generated by the emission of the mixed light, are coupled together. It can do that

In particular, methods are carried out so that the color temperature is increased with an increase in the brightness, while with a reduction in the brightness of the

Color temperature is reduced.

It has been shown that the color temperature, at which a person feels comfortable, is linked to the illuminance and thus to the brightness. This is also in the A paper by AA Kruithoff, "Tubular Luminescent Lamps for General Illumination", Philips Technical Review 6 (3), 1941, pp. 65-73

Illuminance levels will be the color temperature warmer than at high illuminance levels, to be perceived as pleasant by a human. In particular, in the aforementioned document a so-called comfort area, in

Also referred to as Kruithoff's comfort zone, which is comfortable for a human

Brightness color temperature values in a corresponding

Indicates range. In particular, the mixed light can be controlled so that the color temperature and the brightness always see a point in Kruithoff see comfort range. Although color-variable organic light-emitting components are known in the prior art, they are usually set up and controlled in such a way that the entire achievable color space can be controlled. In contrast, in the method described here, the

Brightness coupled to the color temperature such that, as described in more detail below, a

Control concept is enabled, which allows it

color-changeable organic light emitting device to operate with a simple control concept.

In particular, the controller may be designed so that it manages in the simplest case with only one controlled variable. The controlled variable may for example be a so-called dimmer signal, that is to say an electrical signal which can be adjusted by a user and in dependence of which

Mixed light is controlled. The dimmer signal can

for example, a direct current, an alternating current, a

Be DC voltage or an AC voltage. An alterable size of the dimmer signal may correspond, for example one or a combination of the following parameters: a current, a voltage, a

Pulse width modulation (PWM), a phase control, a

Phase section.

According to a further embodiment, the color temperature and the brightness are coupled via a characteristic curve.

In particular, the characteristic can be seen in the Kruithoff '

Comfort area are. The characteristic can

For example, be linear, so that the color temperature increases at least partially proportional to the brightness. Furthermore, the characteristic curve can also be non-linear,

in particular such that the color temperature and the

Brightness can be controlled so that the brightness increases at least partially disproportionate with the color temperature.

According to another embodiment, the color temperature is controlled as a function of the brightness along the Planck's blackbody curve. Such a regulation can also be referred to here as "Planck Wanderer." Alternatively, the color temperature can also be regulated in an area that the Planck 'sees

Blackbody curve with respect to its chromaticity coordinates deviates and which may be characterized by a correlated color temperature.

According to a further embodiment, in the method described here, a driver device is used by means of which the mixed light can be controlled. The

In particular, the driver device can have an input at which the input, which can be selected, for example, by a user,

Dimmer signal is applied. By means of at least one control signal which is output by the driver device at an output, the organic light-emitting component be controlled accordingly to radiate a desired mixed light. Depending on the design of the organic light-emitting component, the driver device can also have a plurality of outputs for outputting control signals, which can drive, for example, a plurality of light-emitting regions of the organic light-emitting component, which can be controlled separately from one another.

According to a further embodiment, a driver device is used to control the mixed light, in which a characteristic is deposited to the color temperature and the

Control brightness in the desired manner. The storage of the characteristic can, for example, in the form of an analog or a digital circuit, such as in the form of a

Microcontroller, done. This may make it possible, in the case of a specific dimmer signal, that is, for example, a selected operating current, of a selected one

Operating voltage or a selected AC or AC signal mixed light output, with a desired color temperature and an associated brightness are generated. In particular, the driver device can output for this purpose at least one or more control signals to the organic light-emitting component, which is correspondingly driven via the control signals. The

In this case, the driver device reacts accordingly to the dimmer signal and adjusts the brightness and the color temperature on the basis of this and the stored characteristic curve. According to a further embodiment, the brightness is a mixed light brightness of the radiated mixed light. In other words, the organic light will be emitting Controlled component so that the mixed light is emitted with a desired mixed light brightness.

According to a further embodiment, the color temperature is a mixed light color temperature of the radiated mixed light. In other words, the organic light emitting device is controlled so that the mixed light is radiated at a desired mixed light color temperature. According to a further embodiment, a driver device is used for the control, which the

 Mixed light color temperature and the mixed light brightness depending on a selectable dimmer signal controls. This can be done in particular by means of the characteristic described above. Is the method described here the

Mixed light color temperature depending on the

Controlled mixed light brightness, it can be achieved in particular that with an increase in the mixed light brightness increases the mixed light color temperature and at a

Reduction of the mixed light brightness

 Mixed light color temperature is reduced. Accordingly, the organic light emitting device can always radiate mixed light whose mixed light color temperature is adapted to the mixed light brightness in a desired manner.

According to another embodiment, the brightness is an ambient brightness. In other words, the organic light-emitting component can be controlled so that in operation a mixed light is emitted, which is provided to generate a desired ambient brightness. The ambient brightness may differ from the mixed light brightness due to spatial conditions such as

Surface colors and structures as well as others Light sources, such as natural or artificial light sources, different from the mixed light brightness.

According to a further embodiment, the color temperature is an ambient color temperature, ie the color temperature of the light that is in the environment of the organic light

emissive component can be perceived. The

Ambient color temperature may be similar to that for the

Ambient brightness is described in advance, from the

Mixed light color temperature differ, for example, due to surface colors and structures and other light sources.

In the method described here, the mixed light is used to produce a desired ambient color temperature and / or a certain ambient brightness in the above

controlled manner, it can be achieved that the ambient light is influenced by the mixed light such that it has the desired previously described dependence of the color temperature on the brightness.

According to a further embodiment, a driver device is used for the control, which controls the brightness in

Dependence on a selectable dimmer signal controls. The color temperature may be controlled in response to a signal from an ambient light sensor having a

Ambient brightness and / or ambient color temperature. In this case, the control of the organic light emitting device is performed by the driving device using the ambient light sensor including the

 Ambient brightness and / or the ambient color temperature measures and based on a characteristic curve a desired

Mixed light color temperature selects to the desired Ambient color temperature and / or ambient brightness to achieve.

According to a further embodiment, an organic light-emitting component has on a substrate at least two electrodes, of which at least one is translucent and between which an organic functional one

Layer stack is arranged. The organic functional layer stack has at least one organic light

emitting layer in the form of an organic

electroluminescent layer, which generates light during operation of the organic light emitting device. The organic light emitting device can

in particular be designed as an organic light-emitting diode (OLED). Furthermore, the organic light

emissive component also be formed as a plurality of OLEDs, which are driven in the method described here as a unit.

In order to produce mixed-colored light, in particular the organic light-emitting component has at least two light-emitting regions which are mutually distinct

different light, so light from different wavelength ranges, can radiate. Each of the light-emitting regions has an organic for this purpose

electroluminescent layer on. Furthermore, each of the light-emitting regions may have its own organic functional layer stack. Alternatively, it may also be possible for the light-emitting

Areas common organic functional layers

exhibit. The light-emitting regions may, as explained in more detail below, be arranged one above the other and by means of two common electrodes be controllable. Furthermore, it is also possible that the light-emitting regions are arranged one above the other and are electrically controllable separately from each other.

Furthermore, it is also possible for the light-emitting regions to be arranged next to one another and to be electrically controllable by means of respectively associated electrodes separated from one another or, alternatively, by means of the same electrodes. In particular, the organic

functional layer stack thereby a plurality of

have juxtaposed light-emitting regions, for example in strip or pixel form, which preferably radiate different colored light and which can be controlled separately from one another. An organic functional layer stack may also include a plurality of stacked organic light emitting layers or regions disposed between the layers

Electrodes are arranged and the preferably radiate different colored light. With "translucent" here and below a layer is designated which is permeable to visible light, whereby the translucent layer can become transparent, ie clear

translucent, or at least partially light-scattering and / or partially absorbing light, so that the translucent layer may be, for example, diffuse or milky translucent. Particularly preferably, a layer designated here as translucent has the lowest possible absorption of light. The organic functional layer stack may comprise layers comprising organic polymers, organic oligomers, organic monomers, organic small non-polymeric molecules ("small molecules") or combinations thereof Materials for an organic light-emitting layer are materials having radiation emission due to fluorescence or phosphorescence, for example, polyfluorene, polythiophene or polyphenylene or derivatives, compounds, mixtures or copolymers thereof. Of the

Organic functional layer stacks may further comprise a functional layer configured as a hole transport layer to allow effective hole injection into the at least one light emitting layer. As materials for a hole transport layer may be

for example, tertiary amines, carbazole derivatives, with

Camphor sulfonic acid doped polyaniline or with

Polystyrenesulfonic doped Polyethylenendioxythiophen prove to be advantageous. The organic functional

Layer stack may further comprise a functional layer which is formed as an electron transport layer. In addition, the layer stack can also have electron and / or hole blocking layers. The substrate may, for example, one or more

 Materials in the form of a layer, a plate, a foil or a laminate, which are selected from glass, quartz, plastic, metal, silicon wafers. Particularly preferably, the substrate glass, for example in the form of a

Glass layer, glass foil or glass plate, on or is from.

With regard to the basic structure of an organic light-emitting component, reference is made to document WO 2010/066245 A1, which is hereby incorporated in particular with reference to the structure, the layer composition and the materials of an organic light-emitting component

expressly accepted by reference. According to a further embodiment, the organic light-emitting component has at least a first light-emitting region which emits first light having a first wavelength during operation, and a second light-emitting region which, during operation, has second light having a second wavelength different from the first wavelength radiates. The first and the second light result

in particular by overlaying the mixed light, which is controlled by the method described here. The first and second light-emitting regions may be controlled by two separate control signals of a driver device. In particular, the organic light-emitting component can thus be, for example, an OLED that emits at least one first light

Area and at least one second light-emitting

 For example, in the form of juxtaposed areas has. Alternatively or additionally, the first and the second light-emitting region can also be arranged one above the other, for example. The light-emitting regions can be formed, for example, in strip-like or pixel-shaped fashion next to one another or can also be arranged one above the other in the form of a plurality of light-emitting layers. In order to achieve a separate activation of the first and second light-emitting regions, correspondingly formed electrodes, which are for example structured, can be provided. The organic light emitting device may also have a plurality of first and second light emitting regions. In addition, it is also possible that the organic light

emitting device more than two light-emitting

Has areas that radiate different colored light from each other and separated by a corresponding number of control signals of a driver device be energized to a desired mixed light

produce .

The different light emitting areas can

For example, be arranged downstream of a diffuser through which a mixing of the light emitted by the individual

Areas of radiated light to produce a homogeneous as possible mixed light takes place.

Furthermore, it may also be possible for the organic light-emitting component to emit permanently a mixed light with a specific color temperature, wherein the

desired color temperature can then be controlled by the organic light-emitting device downstream controllable color filter.

By the control signals of the driver device can

according to the brightness and color temperature, by the organic light-emitting device

emitted mixed light can be adjusted.

According to a further embodiment, the organic light-emitting component has at least a first light-emitting region which emits first light having a first wavelength during operation, and a second light-emitting region which, during operation, has second light having a second wavelength different from the first wavelength radiates, wherein the first and second light-emitting region from each other different current-dependent

Have efficiencies. In such an organic light-emitting device, it may be possible that the first and second light-emitting regions by a common Control signal of the driver device can be controlled.

Furthermore, it may be possible for the light-emitting regions to be arranged one above the other between two common electrodes. In particular, in this case a defined change in the color temperature in dependence on the applied operating current can be achieved by using different light-emitting regions having different current efficiencies and thus a different so-called roll-off behavior, especially at high

Can show current densities. As a roll-off behavior, the efficiency of light generation in the particular light

emitting region as a function of the radiated brightness. In such an organic light-emitting

 Device is a driving device for the control possible, which regulates in response to a dimmer signal jointly applied to the first and second light emitting region current. In such an organic light

emissive component is preferably not a color-changeable OLED with separated from each other

controllable light-emitting regions, which is controlled by means of a stored in a driver device characteristic. Rather, the dependence on brightness and color temperature is a property of the organic light-emitting component and in particular the combination of a first light-emitting region and a second light-emitting region itself

Raising the operating current leads to such

organic light emitting device thus automatically increasing the color temperature. Since the brightness is approximately linearly linked to the operating current can, one can thus speak of a current-dependent control of the color temperature.

For example, as first and second light

emitting area uses a blue emitting first light emitting area and a red-green emitting second light emitting area and decreases

For example, the current efficiency of the red-green emitting second light-emitting region decreases more with increasing current than that of the blue-emitting first light-emitting region, this leads to a change in the ratio of the emission intensity between the red-green emitting region and the blue emitting region a change of the operating current. The blue fraction is higher at high currents than at lower currents, so that at higher currents and a corresponding larger

Brightness of the organic light-emitting device and a higher color temperature of the mixed light can be achieved.

According to a further embodiment, the first and second light-emitting regions have different

Emission reductions on. By different

Emission reductions can be as described above

different power efficiencies can be achieved.

 For example, in the first light-emitting region, an organic light-emitting layer having a

fluorescent material and in the second light-emitting region an organic light-emitting layer can be used with a phosphorescent material. If the first light-emitting region emits blue light during operation and the second light-emitting region emits light in the region of red and / or green and / or yellow light, then in one embodiment appropriate choice and combination of light emitting materials with appropriate emission decay times

desired dependence on brightness and color temperature can be achieved. For example, a fluorescent blue emitter with a decay time of about nanoseconds shows a much less pronounced roll-off behavior than phosphorescent red and green emitters

Cooldowns usually in the microsecond range. According to another embodiment, the

different current-dependent efficiencies

different doping levels and / or different charge carrier barriers in the first and second light

reaching the emitting area.

Furthermore, the first and second light-emitting regions can be arranged one above the other between a common first and a common second electrode, via which the operating current into the first and second light

emissive area can be imprinted. Between the first and second light-emitting regions, a charge-generating layer may be arranged. By the

charge generating layer, the first and second light emitting regions may be connected in series.

Charge generating layers (CGL) are known to the person skilled in the art and therefore will not be described further here.

In particular, the first and second light-emitting regions can be set up so that the mixed light is a

Has mixed light color temperature and a mixed light brightness, regardless of the in the operation of the organic Light-emitting device applied current density always a point in Kruithof f see comfort range.

Further advantages, advantageous embodiments and

Further developments emerge from the following in

Compound described with the figures

Exemplary embodiments.

Show it:

FIGS. 1A and 1B are schematic illustrations of a method for controlling an organic light-emitting component according to an exemplary embodiment,

FIG. 2 shows an organic light-emitting component according to a further exemplary embodiment,

FIG. 3 shows a driver apparatus for a method for

 Control of an organic light-emitting component according to a further exemplary embodiment,

4 shows a color temperature-brightness diagram with regard to a method for controlling an organic light-emitting component according to a further exemplary embodiment, FIG.

FIG. 5 shows an organic light-emitting component according to a further exemplary embodiment,

FIG. 6 shows a driver device for controlling a

organic light-emitting device according to another embodiment and FIG. 7 shows a driver device for controlling a

 organic light emitting device according to another embodiment.

In the exemplary embodiments and figures, identical, identical or identically acting elements can each be provided with the same reference numerals. The illustrated elements and their proportions with each other are not to be regarded as true to scale, but individual elements, such as layers, components, components and areas, for better representation and / or better understanding may be exaggerated.

A method of controlling an organic light emitting device 100 is shown in conjunction with FIGS. 1A and 1B. FIG. 1A shows a first one

 Operating state of the organic light-emitting

Device 100, which in operation a mixed light 101,

especially with a white color impression, radiates to produce a color temperature and a brightness.

In particular, the mixed light has a low brightness in the operating state of FIG. 1A. The organic light emitting device 100 is controlled in this operating state so that the mixed light 101 is also a small

Has color temperature and, for example, causes a warm white light impression in a viewer.

FIG. 1B shows a further operating state of the organic light-emitting component 100 in which the organic light-emitting component 101 is controlled such that the emitted mixed light has a greater intensity

Brightness and thus a greater illuminance than in the operating state according to the figure 1A. At the same time, the organic light emitting device 101 becomes so controlled that a color temperature is generated by the mixed light 101, which is greater than the color temperature in the

Operating state according to the figure 1A. In the method described in connection with FIGS. 1A and 1B, the color temperature is thus increased when the brightness is increased. Likewise, when the brightness is reduced, the color temperature is lowered.

The organic light emitting device 100 may

in particular an organic light-emitting diode (OLED) and according to the below-described

 Be executed embodiments and controlled.

In Figure 2, an organic light emitting device 100 is shown, which in operation mixed light with a white

 Color effect to produce a color temperature and a brightness can radiate, with an increase in brightness, the color temperature increases and at a

Reducing the brightness the color temperature is reduced.

The organic light emitting device has

Substrate 1, on which two electrodes 2, 3 are arranged. At least one of the electrodes 2, 3 is translucent

formed in the illustrated embodiment, purely by way of example, the lower electrode 2 and the substrate 1 are formed translucent. By way of example only, the upper electrode 3 is intransparent and, in particular, reflective, so that the organic light emits light

Device 100 in operation light through the substrate. 1

can radiate. Such an organic light

emitting device is also referred to as a so-called bottom emitter. Alternatively, the upper Electrode 3 may be translucent, while the lower electrode 2 may be reflective. In this case, the organic light-emitting component is designed as a so-called top emitter. Moreover, it may also be possible for the organic light-emitting component 100 to be radiating on both sides, in which case the substrate 1 and both electrodes 2, 3 are designed to be translucent. For example, a reflective electrode may include a metal such as aluminum, barium, indium, silver, gold, magnesium, calcium, or lithium, as well as compounds, combinations, and alloys thereof. A translucent electrode may, for example, comprise a transparent, electrically conductive oxide (TCO) TCOs are transparent, electrically conductive materials, generally metal oxides, such as zinc oxide, tin oxide, cadmium oxide, titanium oxide, indium oxide or indium tin oxide (ITO In addition to binary metal-oxygen compounds like

For example, ZnO, Sn0 ₂ or Ιη ₂ θ _{3 also} include ternary

Metal-oxygen compounds such as Zn ₂ Sn0 ₄ , CdSn0 ₃ , ZnSn0 ₃ , Mgln ₂ 0 ₄ , Galn0 ₃ , Zn ₂ In ₂ 0 ₅ or In ₄ Sn ₃ 0i ₂ or mixtures of different transparent conductive oxides to the group of TCOs , Furthermore, it may be possible that the TCOs do not necessarily correspond to a stoichiometric composition and may also be p- or n-doped. Furthermore, an electrode can also have a combination of at least one metal layer and at least one TCO layer.

In addition, it may also be possible that one

transparent electrode is a layer of one of the

having said metals with a sufficiently small thickness. The translucent in the embodiment shown substrate 1 may for example comprise glass or plastic or a combination or a laminate thereof or be therefrom. In the case of a gas-permeable substrate material, the substrate 1 may further comprise, for example, also a suitable encapsulation layer for sealing the substrate material.

The electrodes 2, 3 may in the embodiment shown in particular be formed over a large area, so that the organic light emitting device 100 by an electrical contacting of the electrodes 2, 3 a

large-area radiation of the generated mixed light

can allow. Alternatively or additionally, the first and / or the second electrode 2, 3 may be structured at least in partial regions, so that, for example, a structured radiation of the mixed light may also be possible. Between the electrodes 2, 3 there are superposed a first light emitting region 4 and a second light

emitting region 5, which are energized in operation together by electrodes 2, 3. The light

emitting regions 4, 5 each have an organic functional layer stack and provide

different color units of organic light

This means that the first light-emitting region 4 in operation emits a first light having a first wavelength, while the second light-emitting region 5 emits second light in operation at a second wavelength different from the first wavelength. In particular, in the shown

Embodiment be the first light blue light, while the second light is selected from a red and / or green and / or yellow wavelength range. The light-emitting regions 4, 5 each have at least one organic light-emitting layer with a suitable electroluminescent material. In addition, the light-emitting regions 4, 5 further organic functional layers such as

Holes in injection layers, hole transport layers,

Electron barrier layers, hole barrier layers,

Electron transport layers and / or

 Having electron induction layers.

By stacking the first light

emitting area 4 and second light emitting area 5, the light emitting areas 4, 5 are connected in series. To improve the electrical

Properties is between the first light-emitting region 4 and the second light-emitting region 5, a charge-generating layer 6, a so-called "charge

The charge-generating layer 6 may in particular be formed as a tunnel junction, which is operated in the reverse direction and which leads to an effective charge separation and thus to a

"Generation" of charge carriers for the adjacent layers can be used.

The first and the second light-emitting region 4, 5 have different current-dependent

Efficiencies on. This shows the light-emitting

Areas 4, 5 different from each other so-called roll-off behavior especially at high current densities, ie a different efficiency in the light generation and depending on the current density and thus the brightness each of the emitted light. In the present embodiment example, the current efficiency of the second, purely by way of example red-green emitting

Range 5 with increasing operating current and thus with an increasing current density decrease more than that

 As a function of the applied current density, this leads to a change in the ratio of the emission intensity between the two light-emitting regions 4, 5. In particular, in the exemplary embodiment shown, the blue component is at high currents higher than at lower, which at a higher current density and thus a higher brightness of the radiated mixed light also increased

Color temperature of this leads.

By way of example, the first and second light-emitting regions 4, 5 may comprise materials having different

Emission decay periods, since the tendency to

described roll-off behavior at high current densities generally with the emission decay time of a

Emitter material correlates. For example, the first light-emitting region 4 may be an organic light

emitting layer having a fluorescent material with a decay time, for example, in the nanosecond range, while the second light-emitting region 5, an organic light-emitting layer having a

having phosphorescent material which has a microsecond decay time.

In addition, it may also be possible that

different charge carrier conductive properties of the light-emitting regions 4, 5 to different current-dependent efficiencies lead. For example, the different current-dependent efficiencies through

different doping levels and / or different charge carrier barriers in the first and second light

emitting area 4, 5 can be achieved or supported.

The light-emitting regions 4, 5 of the organic light-emitting component 100 of FIG. 2 are each subjected to the same operating current during operation due to the stacked arrangement in operation. By the

different current-dependent efficiencies can, with a suitable design of the organic light emitting device 100 in the manner described above a

defined desired color temperature shift in

Correlation can be generated with the radiated brightness of the mixed light. In particular, with the organic light-emitting component 100 of FIG. 2, a method can thus be realized in which an increase in the

Mixed light brightness to increase the

 Mixed light color temperature leads, while a reduction in the mixed light brightness to a reduction of

Mixed light color temperature leads.

The shown construction of the organic light-emitting

Device 100 is to be understood as illustrative and not restrictive. Alternative to the two lights shown

emitting areas 4, 5 of the organic light

emitting device 100, this may also have more light emitting areas. By combining two, three or more through the light-emitting

Areas formed color units can also be made more complex color changes or the Color shift of a single color unit can be strengthened.

FIG. 3 shows a suitable driver device 10 for a method for operating the organic light-emitting component 100. This has an input 11 and an output 12. At the output 12, the

Electrodes 2, 3 of the organic light emitting

Component 100 of Figure 2 are connected. At the input 11, a dimmer signal can be created,

For example, a direct current, a DC voltage, an AC or an AC voltage, in terms of their current strength, voltage or using a

Pulse width modulation (PWM), a phase angle or a phase section can be varied. Examples of suitable control concepts are also listed in the table below. Depending on the

Dimmer signal at the input 11, the driver device 10 at the output 12 a corresponding operating current for operation of the organic light emitting device 100 ready. The control of the color temperature and the brightness in the previously described correlated manner thus requires a control system with only one degree of freedom, namely the dimmer signal, which can be adjusted by a user, for example.

The organic light-emitting component 100 according to the exemplary embodiment shown in FIG. 2 can be designed in particular such that the first and second light

emitting area 4, 5 are arranged so that the mixed light a mixed light color temperature and a

Has mixed light brightness, regardless of a in operation to the organic light emitting device applied current density and thus regardless of the input 11 of the driver device 10 applied dimmer signal always a point in the so-called Kruithoff see comfort range. The Kruithof f provides a comfortable area

Combinations of brightnesses and associated

 Color temperatures, which are perceived by a viewer as pleasant. FIG. 4 shows a corresponding diagram in which the color temperature CT in Kelvin and on the vertical axis the brightness E in lux are shown on the horizontal axis. In the case of an organic light

emitting component emitting a mixed light deviating from Planck's blackbody curve, the color temperature CT should be replaced by the correlated color temperature CCT. The non-hatched region 20 in the diagram shown corresponds to the Kruithof see comfort range as described in the publication AA Kruithoff, "Tubular Luminescent Lamps for General Illumination", Philips Technical Review 6 (3), 1941, pp. 65-73 the color temperature at low levels of brightness must be lower and therefore rather warm white, while at high brightness levels and thus at high illuminance levels, rather cool white and therefore higher color temperatures are required , with an organic light emitting device 100 according to the description of Figure 2 by a suitable

Material choice for the light emitting areas 4 and 5 can be generated. The characteristics 21, 22 can be realized by a suitable combination of light-emitting regions as the organic light-emitting component 100 inside property. For example, according to the characteristic curve 21, a linear relationship between the color temperature and the brightness. Furthermore, it is also possible that according to the characteristic curve 22, a disproportionate increase in brightness is achieved with increasing color temperature. The curves 21 and 22 are purely illustrative and not restrictive. In particular, any characteristic lying in the non-hatched region 20 of the diagram shown in FIG. 4 may be suitable for organic light-emitting components described here.

In Figure 5, a further embodiment of an organic light emitting device 100 is shown, which can also be used for a method for controlling the radiated mixed light, with an increase in brightness, the color temperature increases and at a

 Reducing the brightness the color temperature is reduced.

In contrast to the organic light emitting device 100 described in FIG. 2, the organic light emitting device 100 according to the

Embodiment of Figure 5 a first light

emissive region 4 between electrodes 2 and 3, which is arranged next to a second light-emitting region 5 between its own electrodes 2, 3. Accordingly, the light-emitting regions 4, 5 can be controlled separately from one another. In the exemplary embodiment shown, the light-emitting regions 4, 5 are arranged on a common substrate 1. For example, the light emitting areas 4, 5 may be strip-shaped or pixel-shaped on the

Substrate be arranged and each also present in a plurality. In addition, it may also be possible for the organic light-emitting component 100 to have a plurality of separately formed OLEDs forming at least the first and second light emitting regions 4, 5. It is also possible for the light-emitting regions 4, 5 to be arranged one above the other between common electrodes 2, 3, in which case they are separate

 Triggering at least one further electrode between the light-emitting regions 4, 5 may be provided.

The first light-emitting region 4 is designed such that it emits first light having a first wavelength during operation, while the second light-emitting region 5 is designed such that it emits second light having a second wavelength different from the first wavelength during operation. By superposition of the first and second light, for example by a corresponding geometric design of the light-emitting regions 4, 5 or by a downstream diffuser, the organic light-emitting device 100 according to the embodiment of Figure 5 mixed light in the form of a superposition of the first and second Emit light. The light emitting areas

4, 5 may emit, for example, differently colored light, such as blue light in the first light-emitting region 4 and red and / or green and / or yellow light in the second light-emitting region 5. Moreover, it may also be possible for a light emitting area to be, for example, white light having a certain

Color temperature radiates while the other light

emissive area emits colored light, so that in particular white mixed light with different color temperatures can be generated by different mixing ratios of the first and second light. Furthermore, even further light-emitting regions may be present, the further light different from the first and second light can radiate, resulting in more ways to control the mixed light. The exemplary embodiment of a color-changeable OLED shown in FIG. 5 is thus to be understood as purely exemplary and not restrictive.

The mixed light can be particularly preferably controlled in particular so that the color temperature and the brightness always give a point in the Kruithoff 'see comfort area 20 shown in Figure 4. For this purpose, the

Color temperature and the brightness over a characteristic

be coupled, the characteristic in particular in

Kruithof f see cosiness area 20 can lie.

For example, the characteristic curve may correspond to one of the curves 21, 22 shown in FIG. 4, so that according to FIG

Dependence 21 the color temperature is controlled so that it increases linearly with the brightness, or that according to the

Dependence 22 the color temperature and brightness are controlled so that the brightness is at least partially

disproportionately with the color temperature increases.

For example, the brightness may be a mixed light brightness of the radiated mixed light, while the

Color temperature is a mixed light color temperature of

radiated mixed light is. For the corresponding control of the organic light emitting device 100, a driver device 10 as shown in FIG. 6 may be used which, like the driver device 10 of FIG. 3, has an input 11 for a dimmer signal. Furthermore, the driver device 10 has at least two or, as indicated by the dashed lines, a plurality of outputs 12, via which the light-emitting regions 4, 5 and optionally further light-emitting regions of the organic light-emitting component 100 are controlled separately from one another can be. The control of the color units formed by the light-emitting regions 4, 5 can be effected, for example, by means of pulse width modulation, setting of a current intensity, adjustment of an operating voltage or a combination thereof. Depending on the complexity of the organic light emitting device 100 and

In particular, depending on the number and design of the color units, the driver device 10, a corresponding number of outputs 12 and thus a corresponding number of

Have control channels. The outputs 12 can both for

Adjustment of the brightness of the mixed light and optionally also be designed for color control with one or more additional channels. The functioning of the

Driver device is such that the dimmer signal 11 is applied to the driver device 10. The

 Driver device 10 detects whether it is a DC or AC voltage and selects from this a suitable operating mode for the organic light

emitting component. Examples of suitable

Control concepts are also listed in the table below.

The driver device 10 thus responds to the dimmer signal applied to the input 11 and, based on this signal, adjusts the brightness and the color temperature of the dimmer signal

radiated mixed light on a setting of

respective relative brightness of the first and second light. For this purpose, a characteristic curve as described in connection with FIG. 4 can be stored in the driver device 10 in the form of an analog or digital circuit which predetermines a specific brightness and color temperature for a specific selected dimmer signal. The organic light emitting device 100 is then driven accordingly with the appropriate values.

FIG. 7 shows a further driver device 10 which is suitable for controlling the organic light-emitting component 100 shown in FIG. Compared to the driver device 10 of Figure 6, the

Driver device 10 of Figure 7 in addition to a

Ambient light sensor 13, which measures an ambient brightness and / or an ambient color temperature. Of the

 Ambient light sensor 13 may include, for example, one or more light sensors and be configured to

Brightness and / or color temperatures to measure. The

Brightness in operation due to the radiation of the

Mixed light of the organic light emitting device 100 is to be generated, thus instead of a

Mixed light brightness be an ambient brightness.

Alternatively or additionally, the color temperature to be generated by radiation of the mixed light, instead of a mixed light color temperature

 Be ambient color temperature. The driver device 10 is accordingly set up so that the brightness of the

organic light emitting device 100 in FIG

Depending on a selectable dimmer signal at the input 11 of the driver device 10 is controlled, whereby the

Ambient brightness is affected. The color temperature is controlled as a function of a signal of the ambient light sensor 13, which has an ambient brightness and / or a

Ambient color temperature measures. On the basis of a corresponding characteristic, which can be stored in the driver device 10 as described in connection with FIG. 4, a control of the color temperature via the

Ambient light sensor possible, the ambient brightness and / or measures the ambient color temperature. In particular, the driver device 10 selects based on the stored

Characteristic a meaningful color temperature and controls the organic light emitting device 100 according to the selected brightness. This makes it possible to do that

 Adjust the mixed light so that the ambient light, the

by additional light sources, for example artificial ones

or natural light sources, and / or influenced by surrounding surface colors and structures

can be, by a corresponding mixed light of the

organic light-emitting device 100 can be influenced in a suitable manner.

The driver devices 10 described here can be designed universally such that a dimmer signal is applied to the input of the driver device 10. This detects whether it is a DC or AC voltage or another previously described dimmer signal and

selects a suitable mode of operation for the organic light emitting device based on the dimmer signal.

The following table gives examples of different ones

Control concepts for the previously described

Exemplified embodiments.

Input Dimming by dimming status Brightness Color temperature

AC phase control 100% 100% cool white

 10% 10% warm white

 AC phase section 100% 100% cool white

 10% 10% warm white

 100% 100% Planck Walker or Section 100% AC 10% 10% through

+ 1-channel color control FärbSteuerung

 100% 100% Planck walker or section 10% 10% and red / green + 2-channel variation through color control Color control

AC phase control 100% 100% ambient light or section 10% 10% sensor adjusts + ambient color temperature light sensor

 DC pulse widths 100% 100% cool white

 modulation 10% 10% warm white

DC powered 100% 100% cool white

 10% 10% warm white

DC voltage ^¬ 100% 100% cool white

 driven 10% 10% warm white

DC PWM / Current / Chip 100% 100% Planck Walker + 1 Channel 10% 10% by Color Control Color Control

DC PWM / Current / Chip 100% 100% Planck Walker + 2 Channel 10% 10% and Red / Green Color Control Variation by

 FärbSteuerung

DC PWM / current / span 100% 100% ambient light + 10% 10% sensor adjusts ambient color temperature light sensor

There are in principle also further color control channels as well

other combinations possible. Through the shown

Operating modes it is possible to select the color space even with fully color-changeable organic light emitting

Components such as the "Planck Wanderer" and "Red / Green" Variation of color control "on a meaningful range.

By introducing the mechanisms outlined, the regulation of a color-changeable organic light-emitting component can be greatly simplified and made controllable using conventional control mechanisms such as, for example, a dimmer. This allows the integration in particular of color-changeable organic light-emitting

Components without the need to install new control systems. The regulation of the color temperature and the

In the simplest case, brightness can be realized by means of a controller in the form of a dimmer, which leads to reduced complexity in the control and makes color-changeable organic light-emitting components easier to use.

The ones described in connection with the figures

Embodiments may alternatively or additionally comprise further features according to the description in the general part, even if they are not explicitly described in conjunction with the figures.

The invention is not limited by the description based on the embodiments of these. Rather, the invention encompasses every new feature as well as every combination of features, which in particular includes any combination of features in the patent claims, even if this feature or combination itself is not explicitly described in the claims

Claims or embodiments is given.

Claims

Patent claims 1. Method for controlling an organic light emitting component (100), in which - the organic light-emitting component (100) in Operation of a mixed light (101) with a white one Color impression radiates to create a Color temperature and brightness and - when the brightness increases, the color temperature increases and when the brightness is reduced the color temperature is reduced. 2. The method according to claim 1, in which the mixed light (101) is controlled so that the color temperature and the Brightness always sees a point in the Kruithoff' Comfort area (20). 3. The method according to claim 1 or 2, in which the Color temperature and brightness are coupled via a characteristic curve (21, 22). 4. The method according to claim 3, in which the characteristic curve (21, 22) lies in the Kruithoff comfort range (20). 5. Method according to one of the preceding claims, in which the color temperature is controlled so that it increases linearly with brightness. 6. Method according to one of claims 1 to 4, in which the color temperature and brightness are regulated so that the brightness increases at least partially disproportionately with the color temperature. Method according to one of the preceding claims, in which the brightness is a mixed light brightness of the emitted mixed light (101). 8. The method according to claim 7, in which a driver device (10) is used for control, which Mixed light color temperature and mixed light brightness are controlled depending on a selectable dimmer signal. 9. The method according to any one of claims 1 to 6, in which the brightness is an ambient brightness and the Color temperature is an ambient color temperature. 10. The method according to claim 9, in which a driver device (10) is used for control, which Brightness depending on a selectable Dimmer signal regulates and the color temperature Dependence on a signal of a Ambient light sensor (13) regulates one Ambient brightness and/or a Measures ambient color temperature. 11. Method according to one of the preceding claims, in which the color temperature is seen along the Planck' Black body curve is regulated. 12. Method according to one of the preceding claims, in which the organic light-emitting component (100) has at least a first light-emitting region (4), which during operation emits first light with a first wavelength, and a second light-emitting region (5), which during operation emits second light with one of the first wavelength emits different second wavelength, and in which the first and second light-emitting areas (4, 5) are controlled by two separate control signals Driver device (10) can be controlled. 13. Method according to one of claims 1 to 11, in which the organic light-emitting component (100) has at least a first light-emitting region (4), which during operation emits first light with a first wavelength, and a second light-emitting region (5), which during operation emits second light with one of the first wavelength emits different second wavelength, in which the first and second light-emitting areas (4, 5) have different current-dependent ones Have efficiencies and in which the first and second light-emitting areas (4, 5) are controlled by a common control signal Driver device (10) can be controlled. 14. Organic light-emitting component (100) for emitting mixed light (101) with a white Color impression by superimposing a first and second light a first light-emitting region (4), which during operation emits first light with a first wavelength and a second light-emitting region (5), which during operation emits second light with a second wavelength different from the first wavelength, wherein the first and second light-emitting regions (4, 5) have different current-dependent efficiencies from one another. 15. The component according to claim 14, in which the first and second light-emitting areas (4, 5) are set up so that the mixed light (101). mixed light color temperature and a mixed light brightness which is independent of a component (100) which emits organic light during operation applied current density always has a point in the Kruithoff' see comfort area (20). 16. Component according to claim 14 or 15, wherein the first and second light-emitting regions (4, 5) have different emission decay times. 17. Component according to one of claims 14 to 16, wherein the first light-emitting region (4) is an organic Light-emitting layer with a fluorescent material and the second light-emitting region (5) has an organic light-emitting layer with a phosphorescent material. 18. Component according to one of claims 14 to 17, wherein the first light-emitting region (4) emits blue light during operation and the second light-emitting region (5) emits red and/or green and/or yellow light during operation. 19. Component according to one of claims 14 to 18, wherein the different current-dependent efficiencies are due to different degrees of doping and / or different charge carrier barriers can be achieved in the first and second light-emitting areas (4, 5). Component according to one of claims 14 to 19, wherein the first and second light-emitting regions (4, 5) are arranged one above the other between two electrodes (2, 3) and between the first and second light A charge-generating layer (6) is arranged in the emitting region (4, 5).