DE102017204086A1 - METHOD FOR OPERATING A LIGHT-EMITTING MODULE AND LIGHT-EMITTING MODULE - Google Patents

Abstract

In various embodiments, a method for operating a light-emitting assembly (40) is provided. In the method, first light is generated in a first operating state, which has a predetermined color temperature and a predetermined first wavelength spectrum (26), which is selected so that melatonin production is suppressed in a person who perceives the first light. In a second operating state, second light is generated which has the same predetermined color temperature and a predetermined second wavelength spectrum (28), wherein the second wavelength spectrum (28) is selected such that the melatonin production is not suppressed by the person perceiving the second light becomes.

Description

A light-emitting assembly is used to generate light. For this purpose, the light-emitting module has a lighting arrangement. Optionally, the light emitting assembly may include a controller for operating the lighting assembly. The lighting arrangement and the control unit may be arranged in a common housing or arranged spaced from each other. The illumination arrangement can have one, two or more illumination units, wherein each of the illumination units can have one, two or more light sources. The light sources can each have only one primary light source, for example an LED or an OLED. Alternatively, one or more of the light sources may each have a primary light source and a secondary light source, in particular a conversion element. The primary light source serves to excite light-emitting substances in the secondary light source, in particular the conversion element.

The control unit is used to operate the lighting arrangement. The control unit is used in particular for supplying the lighting arrangement with power and / or for controlling and / or regulating the lighting units, in particular the light sources, the lighting arrangement. In particular, the light sources can be switched on or off together or selectively by means of the control unit, optionally also an intensity of the light generated by the light sources can be adjusted by means of the control unit.

It is known that the hormone melatonin controls the circadian rhythm, ie the sleep-wake rhythm of a human being. The production of melatonin during the day is suppressed by natural light with a high blue content, for example supported by the blue sky, and not suppressed during the night due to the lack of high blue light. This causes a person to produce little melatonin during the day, which makes him alert and focused, and produces a lot of melatonin at night, which can make him tired and able to fall asleep easily.

This effect is already used in lighting arrangements in which cool white light with a high blue content is provided in rooms and / or at times of the day in which alertness and concentration is desired, and in which or to which fatigue and / or good sleep should be encouraged, warm white light is provided with a low blue content. Such lighting arrangements are, for example, CCT tunable LEDs and these having lights. These are used in classrooms, hospitals, airplanes, especially for preventing jet-lag, and in homes to control the amount of blue light according to the circadian rhythm.

Normally, a greater intensity of blue light is desired during the daytime. This is often done by shifting the CCT to cold color temperatures, for example 5000 K or colder, since in cold white light a higher proportion of blue light is contained than in warm white light. In contrast, the color temperature of the light is shifted in the evening and at night to warmer color temperatures with a lower proportion of blue light. With these shifts between 3000 K and 6000 K, a size of the portion of the blue light can vary by a factor of three.

The disadvantage here is that many people perceive a change in the color temperature between warm white light and cold white light and / or cold white light in itself as unpleasant. In addition, the human eye with respect to the perception of color temperature is very sensitive, which is why in a lighting arrangement with multiple lighting units and / or multiple light sources a lot of effort must be operated, so at a varying color temperature at any time all lighting units or all light sources light the same color temperature generate, so that a deviation of the color temperature is not perceived by humans as disturbing. In particular, effort and costs in the production of precise CCT tunable LEDs are particularly high.

An object of the invention is to provide a method of operating a light-emitting assembly which makes it possible to variably influence melatonin production and which in a simple manner contributes to the light generated by the light-emitting assembly being particularly pleasant and / or at any time can not be perceived as disturbing.

An object of the invention is to provide a light-emitting assembly which makes it possible to variably influence a melatonin production and which contributes in a simple way to the light generated by it being perceived as particularly pleasant and / or non-irritating at any time, and / or which can be produced in a simple and / or cost-effective manner.

An object of the invention is achieved by a method for operating a light-emitting assembly, in which: first light is generated in a first operating state, which has a predetermined color temperature and a predetermined first wavelength spectrum, which is selected so that in a person, the perceives the first light, the melatonin production is suppressed; and in a second operating condition, generating second light having the same predetermined color temperature as the first light and having a predetermined second wavelength spectrum selected such that the melatonin production is not suppressed by the person perceiving the second light.

The light emitted from the light-emitting assembly is the first light or the second light. The person picks up the light emitted by the light-emitting module, that is, the first light or the second light. For example, the person is in a room that is illuminated by means of the light-emitting module. Alternatively or additionally, the person uses an electronic device, such as a laptop, a monitor or a cell phone, whose display has the light-emitting module. In this case, the light-emitting module may be, for example, a backlight or a pixel of the electronic device. In the case of the pixel, the electronic device may have a plurality of further corresponding light-emitting assemblies.

The first light and the second light have the same color temperature, but have different wavelength spectra from each other. Thus, for influencing the melatonin production of the person, the color temperature of the light emitted from the light-emitting assembly is not changed, but kept constant, and only the wavelength spectrum of the light generated by the light-emitting assembly is changed. This contributes to the fact that no change in the color temperature is perceived by the person when switching between the first operating state and the second operating state and thus the change from the first to the second light. If, in addition to the color temperature, the brightness and / or the intensity of the generated light are kept constant, then the person consciously and / or directly through vision sees no change in the light at all. The switching between the first light and the second light can be perceived only indirectly by the increase of concentration and alertness under the action of the first light, or the increase of fatigue and need for sleep under the action of the second light by the person. This contributes to the fact that the switching between the first light and the second light is not perceived by the person as unpleasant or annoying.

Furthermore, if the constant color temperature is particularly low and the light generated by the light-emitting assembly, for example, warm white, especially constant warm white light, the person a particularly pleasant perception of the light can be caused, regardless of whether the melatonin production is currently suppressed or the melatonin production is currently not suppressed. Therefore, by means of the light-emitting assembly, for example, in principle warm white light can be generated. In particular, both the first light and the second light may be warm white light. Alternatively, however, cold white light may be generated in principle by means of the light emitting assembly, so that both the first light and the second light are cold white light. The fact that the light is warm white, for example, means that its color temperature is less than 3300 K. For example, the fact that the light is cool white may mean that the color temperature is greater than 5000K. Alternatively, neutral-white light can be generated in principle by means of the light-emitting assembly, so that both the first light and the second light are neutral white light. With regard to the indication of the color temperatures, the definition of characteristic light colors in accordance with DIN 5035 will additionally be used here.

In addition, keeping the color temperature constant implies that the color temperature will not be varied. This contributes to the fact that all lighting units and / or light sources of a lighting arrangement of the light-emitting assembly can emit light of constant color temperature at any time. An elaborate tuning of the lighting units or the light sources with respect to the color temperature with a change in the color temperature is therefore not necessary. This can avoid that the person perceives it as unpleasant that individual lighting units or light sources emit light of different color temperatures. In addition, this contributes to the fact that a control and / or regulation of the light-emitting assembly can be designed particularly simple.

The human receptors responsible for suppressing the production of melatonin are in the eye. Although these receptors capture blue light, they do not contribute to human color vision and color perception. Rather, the receptors are present in addition to the rods and suppositories, which detect blue, green and red colors in the eye available. A maximum of the sensitivity of the receptors, which are responsible for the suppression of melatonin production, is about 490 nm. In contrast, a maximum of the sensitivity of the rods and suppositories, which are responsible for the perception of color, at about 550 nm This means that a person has a particularly good perception of colored light whose wavelengths are in the range of 550 nm, ie in the wavelength range of green light, and that the production of melatonin can be particularly well suppressed if the wavelength of the corresponding light at approx. 490 nm, ie in the wavelength range of blue light. A normalized sensitivity spectrum, from which these maximums of sensitivity emerge, is for example " DIN SPEC 5031-100 - Radiation physics in the field of optics and light technology - Part 100: The melanopic effect of light on humans, mediated by the eye - quantities, symbols and spectra of activity ".

When applied to white light composed of, for example, blue, green and red light, this generally means that the melatonin production can be suppressed particularly well when the wavelength spectrum of the white light, especially the first light, has a relatively high intensity at 490 nm , And that the melatonin production is particularly little suppressed when the wavelength spectrum of the white light, in particular the second light, a relatively low intensity, that is, a gap at 490 nm. The gap at 490 nm may be particularly well-defined if it has a valley of the wavelength spectrum of white light which is particularly deep or very broad. The manner in which such light and in particular such wavelength spectra can be generated will now be described in detail with reference to the possible further developments.

Before switching to the first operating state or the second operating state, it can be determined whether or not the person perceiving the light emitted from the light-emitting module, the first light or the second light, should suppress melatonin production. This determination and / or the switching between the operating states can take place, for example, by means of a control unit of the light-emitting module.

According to a further development, a blue component of the first light is generated by means of a first light source of the light-emitting module, wherein the first light source produces blue light whose wavelength spectrum has a first peak at or at least approximately 490 nm. This contributes to the fact that the first wavelength spectrum of the first light in the range of 490 nm has a particularly high intensity. Thus, the generation of the first light by the first light source, which generates blue light with the first peak at approximately 490 nm, particularly effectively contributes to the suppression of melatonin production. In other words, light, in particular the first light, which causes the melatonin production to be suppressed, can be generated particularly effectively by means of a light source, in particular the first light source, for blue light whose wavelength spectrum has a high point, in particular the first high point, at approximately 490 nm has.

In addition to the blue light, the first light may also have further light components, for example red, green and / or yellow light. The red, green or yellow light can optionally be generated with corresponding further light sources and / or conversion elements of the light-emitting assembly. This makes it possible to produce white light by means of the light-emitting assembly. In particular, both the first light and the second light may be white light, in particular warm white light.

According to one development, the first high point is between 455 nm and 500 nm, for example between 457 nm and 490 nm, for example between 460 nm and 465 nm. This contributes to the first high point being 490 nm or at least approximately 490 nm. In other words, the first high point is 490 nm, or at least approximately 490 nm, meaning that the first high point is within one of the intervals specified in this paragraph.

According to a further development, a blue portion of the second light is generated by means of a second light source of the light-emitting assembly, the second light source producing blue light whose wavelength spectrum has a second peak at a wavelength between 435 nm and 454 nm, for example between 440 nm and 450 nm is located. As explained above, a maximum of the sensitivity of the receptors responsible for the suppression of melatonin production is around 490 nm and the production of melatonin is particularly little suppressed when the second wavelength spectrum of the second light has a gap at 490 nm , This can be achieved, for example, by the high point, in particular the second high point, of the wavelength spectrum of the corresponding blue light being suitably far away from 490 nm.

Thus, the generation of the second light by the second light source, which produces blue light whose wavelength spectrum has the second peak at a wavelength between 410 nm and 454 nm, for example between 415 nm and 450 nm, is particularly effective for melatonin production at. In other words, light, in particular the second light, which causes the melatonin production is not or at least particularly little suppressed, can be generated particularly effectively by means of a light source, in particular the second light source, for blue light whose wavelength spectrum is a high point, in particular the second High point, at a wavelength which is between 410 nm and 454 nm, for example between 415 nm and 450 nm.

In this context, it is particularly advantageous if a laser light source is used as the second light source. The blue light generated by means of the laser light source basically has a particularly narrow wavelength spectrum. Since the second peak has a certain distance of 490 nm with respect to its wavelength, the particularly narrow wavelength spectrum causes a particularly deep and particularly wide gap of the second wavelength spectrum at 490 nm and / or a particularly small overlap of the second wavelength spectrum with 490 nm helping to minimize melatonin production.

In a further development, the first light is generated to have a first intensity, and the second light is generated to have a second intensity, wherein the first intensity is greater than the second intensity. The intensity of the light perceived by the person also contributes to controlling the circadian rhythm. In particular, high intensity promotes alertness and concentration, and low intensity promotes fatigue and the need for sleep. Therefore, generating the first light of relatively high first intensity and generating the second light of relatively low second intensity enhance the effect of the first light having the first wavelength spectrum and the second light having the second wavelength spectrum.

According to a further development, the blue component of the light emitted by the light-emitting module is generated exclusively with two different types of light sources. For example, the first light source represents a first species and the second light source represents a second species. Other types of blue light emitting light sources are not necessary. This can contribute to making the light-emitting assembly particularly simple and / or cost-effective. Of course, in addition to the two types of blue light emitting light sources, further types of light sources may be provided which emit, for example, green, red and / or yellow light.

An object of the invention is achieved by a light-emitting assembly, which is designed to generate in a first operating state first light having a predetermined color temperature and a predetermined first wavelength spectrum, which is selected so that in a person, the first light melatonin production is suppressed, and in a second operating state to produce second light which has the same predetermined color temperature as the first light and which has a predetermined second wavelength spectrum chosen such that the melatonin production in the person receiving the second Perceives light, is not suppressed.

The developments and / or advantages explained above in connection with the method for operating the light-emitting module can be readily transferred to the light-emitting module. Therefore, at this point, a repeated explanation of the advantages and / or developments and omitted refer to the foregoing.

According to a development, the illumination arrangement for generating a blue component of the first light has a first light source which is designed to generate blue light whose wavelength spectrum has a first high point at a wavelength of 490 nm or at least approximately 490 nm.

According to a development, the first high point is between 455 nm and 490 nm, for example between 457 nm and 490 nm, for example between 460 nm and 465 nm.

According to a development, the illumination arrangement for generating a blue component of the second light has a second light source which is designed to generate blue light whose wavelength spectrum has a second high point at a wavelength between 410 nm and 454 nm, for example between 415 nm and 450 nm.

According to a development, the second light source is a laser light source.

According to a development, the illumination arrangement is designed to generate the first light in such a way that it has a first intensity and to generate the second light in such a way that it has a second intensity, wherein the first intensity is greater than the second intensity.

According to a development, the illumination arrangement for generating the blue component of the light emitted by the light-emitting module exclusively comprises two different types of light sources.

According to a development, the first light source has a first primary light source which generates blue light with a wavelength spectrum having the first high point, or the first light source has a first primary light source and a conversion element which emits blue light whose wavelength spectrum has the first high point. Alternatively or additionally, the second light source has a second primary light source that generates blue light having a wavelength spectrum having the second high point, or the second light source has a second primary light source and a conversion element that emits blue light whose wavelength spectrum has the second high point.

The light emitting assembly may include a control unit configured to determine whether to switch to the first operating state or to the second operating state, and / or to switch to the first operating state or to switch to the second operating state.

The light-emitting module can be used for example as a general lighting, for example in a room in which the person is located. Alternatively, the light-emitting assembly may be part of an electronic device that the first person uses. For example, the light-emitting module can be integrated in a monitor, a laptop, a tablet PC or a mobile phone. By way of example, the light-emitting module may be a backlight or a pixel of a display of the corresponding electronic device. In the case of the pixel, the corresponding electronic device may have a plurality of corresponding light-emitting assemblies.

Embodiments of the invention are illustrated in the figures and are explained in more detail below.

• 1 ein erstes Diagramm;
• 2 ein herkömmliches Wellenlängenspektrum einer herkömmlichen lichtemittierenden Baugruppe;
• 3 ein Beispiel eines ersten Wellenlängenspektrums eines Ausführungsbeispiels einer lichtemittierenden Baugruppe;
• 4 ein Beispiel eines zweiten Wellenlängenspektrums des Ausführungsbeispiels der lichtemittierenden Baugruppe;
• 5 ein Beispiel eines zweiten Wellenlängenspektrums des Ausführungsbeispiels der lichtemittierenden Baugruppe;
• 6 eine schematische Ansicht eines Ausführungsbeispiels einer lichtemittierenden Baugruppe;
• 7 eine seitliche Schnittdarstellung eines Ausführungsbeispiels einer Beleuchtungseinheit der lichtemittierenden Baugruppe;
• 8 ein Ablaufdiagramm eines Ausführungsbeispiels eines Verfahrens zum Betreiben einer lichtemittierenden Baugruppe.

Show it:

• 1 a first diagram;
• 2 a conventional wavelength spectrum of a conventional light-emitting assembly;
• 3 an example of a first wavelength spectrum of an embodiment of a light-emitting assembly;
• 4 an example of a second wavelength spectrum of the embodiment of the light-emitting assembly;
• 5 an example of a second wavelength spectrum of the embodiment of the light-emitting assembly;
• 6 a schematic view of an embodiment of a light-emitting assembly;
• 7 a side sectional view of an embodiment of a lighting unit of the light-emitting assembly;
• 8th a flowchart of an embodiment of a method for operating a light-emitting assembly.

In the following detailed description, reference is made to the accompanying drawings, which form a part of this specification, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. Because components of embodiments may be positioned in a number of different orientations, the directional terminology is illustrative and is in no way limiting. It should be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. It should be understood that the features of the various embodiments described herein may be combined with one another, if not specifically stated otherwise. The following detailed description is therefore not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims. In the figures, identical or similar elements are provided with identical reference numerals, as appropriate.

A light-emitting assembly has a lighting arrangement for generating light. The illumination arrangement can have one, two or more light-emitting components. Optionally, a light-emitting assembly may also have a control unit. The control unit may have one, two or more electronic components. An electronic component may have, for example, an active and / or a passive component. An active electronic component may have, for example, a computing, control and / or regulating unit and / or a transistor. A passive electronic component may, for example, comprise a capacitor, a resistor, a diode or a coil.

A light emitting device may be a semiconductor light emitting device in various embodiments and / or formed as a light emitting diode, an organic light emitting diode, a light emitting transistor, or an organic light emitting transistor. The light may, for example, be light in the visible range, UV light and / or infrared light. In this connection, the light-emitting component can be designed, for example, as a light-emitting diode (LED), in particular as a laser diode, as an organic light-emitting diode (OLED), as a light-emitting transistor or as an organic light-emitting transistor. The light emitting device may be part of an integrated circuit in various embodiments. Furthermore, a plurality of light-emitting components may be provided, for example housed in a common housing.

1 shows a diagram whose X-axis wavelengths are plotted in nanometers and on whose Y-axis a relative sensitivity of a man is plotted. In the diagram represents a first function graph 20 a sensitivity of receptors in the human eye responsible for suppressing production of melatonin in the human body. A second function graph 22 represents a sensitivity of the rods and suppositories in the human eye responsible for the perception of color.

The diagram shows that a maximum of the sensitivity of the receptors is about 490 nm, whereas a maximum of the sensitivity of the rods and suppositories is about 550 nm. This means that a person has a particularly good perception of light at wavelengths in the range of 550 nm, ie in the wavelength range of green light, and that the production of melatonin with light in a wavelength range around 490 nm, ie in the wavelength range of blue light, particularly good can be suppressed. This also means that a human has a relatively poor perception of a color change of light when that change occurs primarily in a wavelength range around 490 nm or less, and that the production of melatonin can be particularly little suppressed when using blue light which has a particularly low intensity at 490 nm.

2 shows a conventional wavelength spectrum of a conventional light-emitting assembly. The conventional light-emitting assembly has, for example, warm-white light-emitting light sources. The warm white light has, for example, a CRI of 80 and a color temperature of 3000 K. The light sources each have a primary light source and a secondary light source, in particular a conversion element. As the primary light source, for example, an LED based on an InGaN chip is used. The conversion element has, for example, green light emitting and red light emitting phosphors. The resulting conventional wavelength spectrum has a peak between 445 nm and 450 nm and a relatively small gap at approximately 490 nm in the wavelength range attributable to blue light. The conventional light-emitting package is thus not particularly well suited to melatonin production Suppress people, especially well suited to promote the melatonin production of a human.

3 shows an example of a first wavelength spectrum 26 of an embodiment of a light-emitting assembly. The light-emitting assembly is designed such that, in a first operating state, it can generate first light that corresponds to the first wavelength spectrum 26 For example, if suppression of melatonin production is desired in a person perceiving the first light. For example, the first light is warm white light with a color temperature of 3000 K and a CRI of 80.

Compared to the conventional wavelength spectrum 24 is a high point of the first wavelength spectrum 26 clearly shifted towards 490 nm in the blue wavelength range. In particular, the high point is at or at least approximately 490 nm. This contributes to the suppression of the person's melatonin production particularly effectively.

For example, to generate the first light, a first light source may be used which emits blue light whose spectrum has a high point, also referred to as the first high point, at or at least approximately 490 nm. This means that the first high point is between 455 nm and 500 nm, for example between 457 nm and 490 nm, for example between 460 nm and 465 nm. Preferably, the first high point is an absolute high point of the spectrum of the blue light emitted by the first light source. How the first light source can be configured in detail will be explained in more detail below with reference to the light-emitting assembly.

4 shows an example of a second wavelength spectrum 28 of the embodiment of the light-emitting assembly. The light-emitting assembly is designed such that, in the first operating state, it can generate the first light that corresponds to the first wavelength spectrum 26 For example, if the suppression of melatonin production is desired in the person perceiving the first light and that, in a second operating condition, he can generate second light that is the second wavelength spectrum 28 For example, if suppression of melatonin production in the subject is not desired. For example, the second light is warm white light at a color temperature of 3000K and a CRI of 80. The second light thus has the same color temperature and CRI as that related to 3 explained first light.

Compared to the conventional wavelength spectrum 24 is at the second wavelength spectrum 28 the gap at 490 nm significantly deeper and wider. Otherwise, compared with the conventional wave spectrum 24 the high point of the second wavelength spectrum 28 in the blue wavelength range not shifted towards 490 nm. In particular, the high point of the second wavelength spectrum lies 28 like that of the conventional wavelength spectrum 24 between 445 nm and 450 nm. The gap and the second peak of the second wavelength spectrum spaced from 490 nm 28 contribute to the fact that by means of the second light, the melatonin production of the person is particularly little suppressed.

For generating the second light, it is possible, for example, to use a second light source which emits blue light whose spectrum has a high point, which is also referred to as the second high point, which is as far apart as possible from 490 nm. For example, the second high point may be at a wavelength between 410 nm and 454 nm, for example between 415 nm and 450 nm. How the second light source can be configured in detail will be explained in more detail below with reference to the light-emitting assembly.

5 shows an alternative example of a second wavelength spectrum 28 the embodiment of the light-emitting module. The light-emitting assembly is designed such that, in the first operating state, it can generate the first light that corresponds to the first wavelength spectrum 26 For example, if the suppression of melatonin production is desired in the person perceiving the first light, and that in the second mode of operation, he can generate the second light, the second wavelength spectrum 28 For example, if suppression of melatonin production in the subject is not desired. For example, the second light is warm white light at a color temperature of 3000K and a CRI of 80. The second light thus has the same color temperature and CRI as that related to 3 explained first light.

Compared to the conventional wavelength spectrum 24 is at the second wavelength spectrum 28 the gap at 490 nm significantly deeper and wider. In addition, the second wavelength spectrum has 28 compared to the conventional wave spectrum 24 in the blue wavelength range, a very narrow peak in the range between 445 nm and 455 nm. Due to the particularly narrow peak, which is at a distance of 490 nm, a particularly deep and wide gap results at 490 nm. The particularly deep and wide gap and the high point of the second wavelength spectrum 28 spaced apart from 490 nm contribute to the melatonin production by means of the second light the person is particularly little suppressed.

For generating the second light, for example, a second light source may be used which has a blue light emitting laser diode whose spectrum has the very narrow peak in the range between 445 nm and 455 nm, the peak having the second high point. When using the blue light emitting laser diode for generating the blue portion of the second light may be on Conversion element that emits the blue light can be dispensed with. Furthermore, for generating the second light, for example, an orange light-emitting light source may be used, for example an orange light-emitting LED.

6 shows a schematic view of an embodiment of a light emitting assembly 40 , The light-emitting assembly 40 has a lighting arrangement 42 and a control unit 44 on. The lighting arrangement 42 and the control unit 44 may be arranged in a common housing, not shown in the figures or arranged spaced from each other. The light-emitting assembly 40 Can be used for general lighting in a building, especially in a room. Alternatively, the light emitting assembly 40 Be part of an electronic device. The electronic device may be, for example, a monitor, a laptop, a tablet PC or a mobile phone. The light-emitting assembly 40 For example, it may be a backlight or a pixel of a display of the electronic device. In the case of the pixel, the electronic device may have a plurality of further corresponding light-emitting assemblies 40 exhibit.

The lighting arrangement 42 has several lighting units 46 on, with each of the lighting units 46 exactly two light sources, in particular in each case a first light source 50 and a second light source 52 , having.

The first light sources 50 In the first operating state, they produce first light which has a predetermined color temperature and which has a wavelength spectrum which contributes to the suppression of melatonin production in a person who perceives the first light. In particular, the first light sources generate 50 the first light with the first wavelength spectrum, for example, with reference to FIG 3 explained in more detail first wavelength spectrum 26 ,

The second light sources 52 generate in the second operating state second light which has the predetermined color temperature, in particular the same predetermined color temperature as the first light, and which has a wavelength spectrum which contributes to the fact that in a person who perceives the second light melatonin production is not or at least particularly little is suppressed. In particular, the second light sources generate 52 the second light with the second wavelength spectrum, for example, with reference to 4 or with reference to FIG 5 explained in more detail second wavelength spectrum 28 ,

The control unit 44 includes a processor, a memory, and a communications module for communicating with the lighting assembly 42 on. The control unit 44 serves to operate the lighting arrangement 42 , The control unit 44 serves in particular for supplying the lighting arrangement 42 with power and / or for controlling and / or regulating the lighting units 46 , especially the light sources 50 , 52, the lighting arrangement 42 , By means of the control unit 44 can be switched to the first operating state or the second operating state. In particular, by means of the control unit 44 the first light sources 50 or the second light sources 52 be switched on or off, optionally also an intensity of the light sources 50 . 52 generated light by means of the control unit 44 can be adjusted.

In addition, the control unit 44 serve to determine if a person is using the lighting arrangement 42 perceived light, melatonin production suppressed or promoted, so should not be suppressed. This can be done by the control unit 44 For example, have an input unit through which the person of the control unit 44 can tell whether currently melatonin production should be suppressed or promoted. Alternatively or additionally, the control unit 44 have a timing and in the memory can be stored, at what day or night time melatonin production should be suppressed or promoted, and the control unit 44 Depending on the data stored in the memory and the current time, you can independently decide whether melatonin production should currently be suppressed or promoted. Optionally, by means of the input unit of the control unit 44 the times during which melatonin production is to be suppressed and the times during which melatonin production is to be promoted communicated. Optionally, the input unit may be integrated into the control unit 44. Alternatively, the input unit may be connected to the control unit 44 communicate, for example via cable, via radio, via Bluetooth, or via W-LAN.

The light-emitting assembly 40 generated by means of the first light sources 50 the first light having the predetermined color temperature and having the first wavelength spectrum if the control unit 44 determines that the melatonin production should be suppressed in the person. The light-emitting assembly 40 generated by means of the second light sources 52 the second light, which is also the default color temperature and that has the second wavelength spectrum if the control unit 44 determines that melatonin production should be promoted or not suppressed in the individual. The light-emitting assembly 40 For example, the light-emitting assembly may be the first light having the first wavelength spectrum 26 according to 3 and the second light with the second wavelength spectrum 28 according to 4 or according to 5 generated.

In an alternative embodiment, not shown in the figures, the light-emitting assembly 40 only one, two, three, four or more than five lighting units 46 exhibit. Further, one, two or more of the lighting units may be used 46 more than just the two light sources shown 50 . 52 exhibit. For example, the lighting units 46 each having a further light source for generating green light, a further light source for generating red light and / or a further light source for generating yellow light. The lighting arrangement 42 and / or the lighting units 46 For example, they can form one, two or more pixels of a display.

7 shows a side sectional view of an embodiment of one of the lighting units 46 the light emitting assembly 40 , The first light source 50 has a first primary light source 54 on, in a first secondary light source, in particular in a first conversion element 58 is embedded. The first conversion element 58 has phosphors, which by means of the primary light source 54 be excited to emit light.

For generating the first light, as the first primary light source 54 a blue light emitting LED can be used. For example, as the first primary light source 54 an InGaN LED is used with the blue light spectrum shifted so that the first peak is between 460 nm and 465 nm. In addition, green, red and / or yellow light can still be generated, for example by means of corresponding phosphors in the first conversion element 58 , Alternatively, the green, red and / or yellow light by means of corresponding additional light sources in the lighting unit 46 be generated.

Alternatively, for generating the first light as the first primary light source 54 a violet light emitting LED and as a secondary light source, the first conversion element 58, the blue light emitting phosphors, are used. Examples can be used to generate the first light as the first primary light source 54 a violet light with wavelengths between 390 nm and 410 nm emitting LED and as a first conversion element 58 For example, BaMgAl ₁₀ O ₁₇ : Eu ²⁺ (BAM) can be used with a high Eu content. In addition, still green, red and / or yellow light can be generated, for example by means of appropriate phosphors in the first conversion element 58. Alternatively, the green, red and / or yellow light by means of corresponding additional light sources in the lighting unit 46 be generated.

For generating the second light may serve as a second primary light source 55 Also, a blue light emitting LED may be used, particularly an InGaN chip based LED, where the first peak in the blue light spectrum is 450 nm or less. Further, the phosphors used to generate the white light may be selected so that the wavelengths of the light they emit are shifted toward large wavelengths, thereby increasing the gap in the second spectrum. For example, a typically used green light emitting phosphor, such as LuAG: CE, may be replaced by a yellow light emitting phosphor, such as YAG: CE. At this time, a high color rendering value of, for example, 80 can be obtained by using red light-emitting phosphors whose red light is shifted toward long wavelengths, for example, (Sr, Ca) AlSiN: Eu.

Alternatively, for generating the second light, the reference to 5 explained laser diode can be used as a primary light source.

The light sources 50 . 52 can each only a primary light source 54 . 56 , For example, an LED or an OLED have. Alternatively, one or more of the light sources 50 . 52 each a primary light source 54 . 56 and a secondary light source, in particular a conversion element 58, 60.

8th shows a flowchart of a method for operating a light-emitting assembly, for example, to operate the light-emitting assembly explained above. If necessary, the procedure can be carried out by the control unit 44 the light-emitting assembly are processed. The procedure serves to influence the melatonin production of a person by means of light without the person has an unpleasant or disturbing feeling due to a changing color temperature of the light, due to a too cold color temperature of the light and / or due to light sources emitting light of different color temperature.

In a first step S2, the method is started, for example when the light-emitting module is switched on. If necessary, variables are initialized in step S2.

In a second step S4, a check is made as to whether a person perceives light emitted by the light-emitting module, suppresses melatonin production or does not want to suppress it, for example conveyed it. This check may, for example, be a comparison of the current time of day with one, two or more times of day on a storage unit of the control unit 44 are stored. Alternatively or additionally, the check may comprise, for example, a readout of one or more current settings, for example an input unit. Alternatively or additionally, the check may be a reading of data from a communication module of the control unit 44 include, wherein the data to the communication module, for example, by means of the input unit wired or wirelessly can be communicated. If it is detected in the step S4 that the melatonin production is to be suppressed, the processing is continued in a step S6. If it is recognized in the step S4 that the melatonin production is not to be suppressed, the processing is continued in a step S10.

In step S6, the light-emitting device is operated to emit first light having the predetermined color temperature and a first spectrum. For example, the first light is white, and the given color temperature is warm white, for example. The first spectrum has a relatively high intensity at 490 nm. Therefore, the first light having the first spectrum contributes to an effective suppression of melatonin production in the subject. In order for the light-emitting module to emit the first light, the control unit can 44 the first light sources 50 to drive so that they emit light, and the second light sources 52 do not drive or drive so that they do not emit light.

In an optional step S8, the light-emitting module can be operated such that the first light is operated with a first intensity, in particular with a particularly high intensity. For this purpose, the control unit 44, for example, the first light sources 50 such that they emit the first light with the particularly high intensity.

In step S10, the light-emitting device is operated to emit second light having the predetermined color temperature and a second spectrum. For example, the second light is white and the predetermined color temperature is warm white, for example. The first spectrum has a relatively low intensity at 490 nm, for example a gap around 490 nm. Therefore, the second light having the second spectrum does not or only slightly suppresses the person's melatonin production and thus promotes melatonin production. Nevertheless, the second light has the same color temperature as the first light. The change from the first to the second light is therefore not visible to the person, which is why the change can not be perceived as unpleasant or disturbing. In addition, both the first light and the second light, for example, warm white, which can be perceived by the person as pleasant. In order for the light-emitting module to emit the second light, the control unit can 44 the second light sources 52 drive so that they emit light, and the first light sources 50 do not drive or drive so that they do not emit light.

In an optional step S12, the light-emitting module can be operated such that the second light is operated with a second intensity, in particular with a particularly low intensity. This can be done by the control unit 44 for example, the second light sources 52 such that they emit the second light with the particularly low intensity.

LIST OF REFERENCE NUMBERS

first functional graph 20 second function graph 22 conventional wavelength spectrum 24 first wavelength spectrum 26 second wavelength spectrum 28 light-emitting module 40 lighting arrangement 42 control unit 44 lighting unit 46 first light source 50 second light source 52 first primary light source 54 second primary light source 56 first conversion element 58 second conversion element 60

QUOTES INCLUDE IN THE DESCRIPTION

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Cited non-patent literature

• DIN SPEC 5031-100 [0014]

Claims (15)

Method for operating a light-emitting assembly (40), in which in a first operating condition, first light is generated having a predetermined color temperature and a predetermined first wavelength spectrum (26) selected to suppress melatonin production in a person perceiving the first light, and second light is generated in a second operating state, which has the same predetermined color temperature as the first light and which has a predetermined second wavelength spectrum (28), which is chosen so that the melatonin production in the person who perceives the second light, not suppressed becomes. Method according to Claim 1 in that a blue portion of the first light is generated by a first light source (50) of the light emitting assembly (40), the first light source (50) producing blue light whose wavelength spectrum has a first peak at or at least approximately 490 nm. Method according to Claim 2 in which the first high point is between 455 nm and 500 nm, for example between 457 nm and 490 nm, for example between 460 nm and 465 nm. A method according to any preceding claim, wherein a blue portion of the second light is generated by a second light source (52) of the light emitting assembly (40), the second light source (52) producing blue light whose wavelength spectrum has a second peak at one wavelength which is between 435 nm and 454 nm, for example between 440 nm and 450 nm. Method according to Claim 4 in which a laser light source is used as the second light source (52). The method of any one of the preceding claims, wherein the first light is generated to have a first intensity and the second light to be generated to have a second intensity, wherein the first intensity is greater than the second intensity. Method according to one of Claims 2 to 6 in which the blue portion of the first light and the second light is generated exclusively with two different types of light sources. Light emitting assembly (40) adapted to in a first operating state, generating first light having a predetermined color temperature and a predetermined first wavelength spectrum (26), wherein the first wavelength spectrum (26) is selected so as to suppress melatonin production in a person perceiving the first light, and in a second operating condition, producing second light having the same predetermined color temperature as the first light and having a predetermined second wavelength spectrum (28) selected so that the person perceiving the second light does not suppress melatonin production becomes. Light emitting assembly (40) after Claim 8 wherein the illumination means (42) for generating a blue portion of the first light comprises a first light source (50) adapted to produce blue light whose wavelength spectrum has a first peak at a wavelength of 490 nm or at least approximately 490 nm , Light emitting assembly (40) after Claim 9 in which the first high point is between 455 nm and 500 nm, for example between 457 nm and 490 nm, for example between 460 nm and 465 nm. Light-emitting assembly (40) according to one of Claims 8 to 10 in that the illumination arrangement (42) for generating a blue portion of the second light comprises a second light source (52) adapted to produce blue light whose wavelength spectrum has a second high point at a wavelength between 435 nm and 454 nm , for example between 440 nm and 450 nm. Light emitting assembly (40) after Claim 11 in which the second light source (52) is a laser light source. Light-emitting assembly (40) according to one of Claims 8 to 12 in that the illumination assembly (42) is adapted to generate the first light to have a first intensity and to generate the second light to have a second intensity, the first intensity being greater than the second intensity is. Light-emitting assembly (40) according to one of Claims 8 to 13 in that the illumination arrangement (42) for generating the blue component of the light emitted by the light-emitting assembly (40) comprises only two different types of light sources (50, 52). Light-emitting assembly (40) according to one of Claims 9 to 14 in that the first light source (50) has a primary light source (54) that produces blue light having a wavelength spectrum having the first high point, or the first light source (50) has a primary light source (54) and a first conversion element (58) which emits blue light whose wavelength spectrum has the first high point and / or the second light source (52) has a second primary light source (54) which generates blue light with a wavelength spectrum having the second high point or the second light source (52 ) has a primary light source (56) and a second conversion element (60) which emits blue light whose wavelength spectrum has the second high point.

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