WO2014170268A1

WO2014170268A1 - Lighting device for backlighting a display or a television, display and television

Info

Publication number: WO2014170268A1
Application number: PCT/EP2014/057525
Authority: WO
Inventors: Ion Stoll; Hailing Cui
Original assignee: Osram Opto Semiconductors Gmbh
Priority date: 2013-04-19
Filing date: 2014-04-14
Publication date: 2014-10-23
Also published as: DE102013103984A1

Abstract

The invention relates to a lighting device (1) for backlighting a display or a television. In operation, the lighting device (1) emits electromagnetic radiation having a complete spectrum which has a first peak (6), a second peak (9) and a third peak (10), wherein - at least the electromagnetic radiation of one of the peaks (6, 9, 10) is generated by means of a conversion element (11) and - the lighting device has an absorber material (12, 12') which absorbs a specified spectral range of the complete spectrum. The invention further relates to a display and a television.

Description

description

Illumination device for backlighting a display or a television, display and television

There is a lighting device for backlighting a display or a television as well as a display and a TV specified. An illumination device is for example in the

Publication US 6,513,949 discloses.

It is intended to specify a lighting device with whose light the largest possible color triangle in the CIE color diagram can be clamped. In particular, a lighting device is to be specified, which is suitable for use in a television or as a backlight for a display. Furthermore, a display and a television with such a lighting device should be specified.

These objects are achieved by a lighting device having the features of claim 1 and by a display and a television each having the features of

Claim 19 solved.

Advantageous developments and embodiments of the illumination device and the backlighting are specified in the respective dependent claims.

The lighting device sends according to a

Embodiment in operation electromagnetic radiation with an overall spectrum. The overall spectrum has a first peak, a second peak, and a third peak.

The term "peak" here means a wavelength range of the total spectrum in which a local

Intensity maximum is located.

The electromagnetic radiation of at least one of the peaks here is preferably generated by means of a conversion element. This means that the conversion element

absorbed electromagnetic radiation and in

electromagnetic radiation with the respective peak

transforms. Particularly preferably, this absorbs

Conversion element, the electromagnetic radiation of the first peak or the second peak or the third peak and converts them. For example, that absorbs

Conversion element electromagnetic radiation of the first peak and converts them at least partially in

electromagnetic radiation of the second peak and / or into electromagnetic radiation of the third peak.

In other words, the conversion element is embodied wavelength-converting in the present case. The term "wavelength-converting" is understood to mean in particular the property of radiated electromagnetic radiation of a specific wavelength range in

to convert electromagnetic radiation of another, preferably longer wavelength wavelength range. In particular, a wavelength converting element absorbs

electromagnetic radiation of an irradiated

Wavelength range, this usually converts by electronic processes at the atomic and / or molecular level in electromagnetic radiation of the other Wavelength range and sends the converted

Radiation again. In particular, a pure scattering or a pure absorption of electromagnetic radiation in the present case is not meant by the term "wavelength-converting".

The illumination device furthermore preferably has an absorber material. The absorber material is to

provided a predetermined spectral range of the

To absorb the entire spectrum.

According to one embodiment, the absorber material absorbs a portion of the peak generated by the conversion element, thereby reducing the half width of the peak.

Below the middle half width ("Füll Width Half

Maximum ", short FWHM) of a peak is understood in the present case, the width of the peak, in which half of the

Intensity maximum is reached.

According to one embodiment, the half-width of the peak is reduced by at least 0.5 nanometers due to absorption of the absorber material.

The half-width of the first peak is especially

preferably between 15 nanometers and

including 30 nanometers. The half-width of the peak generated by means of a conversion element is particularly preferably between 50 nm and 120 nm inclusive. For example, the

Half-width of a peak, which by means of a

Conversion element is generated, the europium ions as Activator typically covers between 50 nanometers and 100 nanometers inclusive. The

Half-width of a peak, which by means of a

Conversion element is generated, which includes cerium ions as an activator, for example, is usually at least 100 nanometers.

For example, the absorber material absorbs radiation of a wavelength range of the peak that is free from the peak local maximum intensity. For example, the wavelength range of the absorber material is adjacent

is absorbed to the local intensity maximum.

Particularly preferably, the wavelength range absorbed by the absorber material extends at least into one edge of the peak. In this way, the half width of the peak is particularly effectively reduced.

For example, the first peak is in blue

Spectral range, the second peak in the green spectral range and the third peak in the red spectral range.

Particularly preferred are the electromagnetic radiation with the second peak and / or the

generates electromagnetic radiation with the third peak by means of a conversion element. For example, the half-width of the green peak and / or the red peak is reduced by means of the absorber material.

According to a further embodiment, the spectral region of the absorbed by the absorber material is

Total spectrum between two directly adjacent peaks.

For example, it is due to the absorber material

absorbed spectral range between the first peak and the second peak or between the second peak and the third peak. In this case, the partial area of the absorbed radiation is particularly preferably not part of the half-width of the peaks.

For example, the first peak is blue

Spectral range, the second peak in the green spectral range and the third peak in the red spectral range and the

Absorber material absorbs a given spectral

Range between the first peak and the second peak from the cyan spectral range or a predetermined spectral range between the second peak and the third peak from the yellow spectral range. Furthermore, it is also possible that the absorber material is suitable for electromagnetic radiation of the

To absorb the entire spectrum from the ultraviolet spectral range, which can damage the human eye. Preferably, the absorber material absorbs electromagnetic radiation of a wavelength range having a width

between 15 nanometers and 80 nanometers. Particularly preferably, the absorber material for these

electromagnetic radiation has an absorption coefficient of at least 30 000 cm ^_1 / M.

A central idea in the present case is to selectively as completely as possible by means of an absorber material electromagnetic radiation from subregions of the entire spectrum

absorb and thus to achieve an enlargement of the color triangle, which can be spanned with the entire spectrum. For example, a peak of the electromagnetic radiation generated by means of the conversion element, be narrowed with the help of an absorber material. A narrowing of the peaks, which span the color triangle, usually leads to an advantage in an enlargement of the color triangle. Furthermore, electromagnetic can also

Radiation between the intensity maxima of the individual peaks outside their half-width can be absorbed by the absorber material. This, too, usually leads advantageously to an enlargement of the color triangle.

For example, the lighting device has a

Semiconductor body, the electromagnetic in operation

Emitting radiation with a first spectrum having the first peak. Furthermore, in this embodiment, the illumination device comprises a conversion element that transmits the electromagnetic radiation with the first spectrum

partially converted into electromagnetic radiation having a second spectrum having the second peak, and further a further portion of the electromagnetic

Radiation with the first spectrum in electromagnetic

Converts radiation with a third spectrum having the third peak.

In other words, in this case, electromagnetic radiation of a first spectrum, which particularly preferably has a first peak in the blue spectral range, may be partially formed by means of a conversion element

converted electromagnetic radiation with a first spectrum and with a second spectrum. For this purpose, the conversion element, for example, two different

Phosphors on. This is particularly preferred

Conversion element electromagnetic radiation having a peak in the blue spectral range, which is emitted by the semiconductor body, in electromagnetic radiation with a second peak in the green spectral range and with a third peak in the red spectral range.

The illumination device in this case emits mixed-color light with the entire spectrum, the radiation of the first blue peak, radiation of the second green peak and

Radiation of the third red peak. It is also possible for the mixed-color light to consist of the total spectrum, of radiation of the first blue peak, radiation of the second green peak, and radiation of the third red peak.

According to a further embodiment, the

Lighting device, in turn, a semiconductor body which emits in operation electromagnetic radiation having a first spectrum having the first peak. In addition, the illumination device includes in this

Embodiment another semiconductor body, which in the

Operation also emits electromagnetic radiation with the first spectrum having the first peak. Furthermore, in the light path of the further semiconductor body is a

Conversion element arranged, the electromagnetic radiation of the other semiconductor body partially in

Electromagnetic radiation of the second spectrum or into electromagnetic radiation of the third spectrum converts.

Furthermore, it is also possible that the

Lighting device has three semiconductor body, which emits in each case in operation electromagnetic radiation having a first spectrum having the first peak. In the light path of a semiconductor body is in turn a

Conversion element arranged, which transmits the electromagnetic radiation of the first spectrum in electromagnetic

Radiation of the second spectrum converts. In the light path of a another semiconductor body is also another

Radiation of the third spectrum converts.

Particularly preferred here is the most complete possible conversion of the electromagnetic radiation of the first

Spectrum in electromagnetic radiation of the second

Spectrum sought. Likewise, it is particularly preferable to convert as completely as possible the electromagnetic radiation of the first spectrum into electromagnetic

Aimed at radiation of the third spectrum.

For example, if the semiconductor bodies emit blue light, then one conversion element converts the blue light of the first spectrum as completely as possible into green light of the second spectrum, while the other conversion element converts the blue light of another

Semiconductor body as completely as possible converted into red light of the third spectrum. The blue light of the third semiconductor body is particularly preferably not converted and leaves the illumination device

unconverted. In this embodiment, the

Lighting device particularly preferably two different absorber materials, wherein the one absorber material reduces the half-width of the second peak by absorbing electromagnetic radiation of the second peak and the other absorber material, the half-width of the third peak by absorbing electromagnetic radiation of the third peak. Furthermore, it is also possible that the one absorber material electromagnetic radiation of a Part of the entire spectrum between the first peak and the second peak and the other absorber material

electromagnetic radiation of a portion of the

Whole spectrum absorbed between the second peak and the third peak. The partial region of the absorbed radiation is preferably not part of the half-width of the peaks.

In this embodiment, it is also possible that the semiconductor body emit electromagnetic radiation of a first spectrum, the part of the ultraviolet

Spectral range is. Send the semiconductor body

Ultraviolet light, it is particularly preferred to achieve as complete as possible a conversion of the ultraviolet light. Particularly preferably, a conversion element is arranged in the light path of the one semiconductor body, which converts its ultraviolet radiation as completely as possible into green radiation of the second spectrum, while in the light path of a further semiconductor body

Conversion element is arranged, which is the ultraviolet

Radiation as completely as possible converted into red radiation of the third spectrum. In the light path of the third

Semiconductor body is finally another

Conversion element arranged, the ultraviolet

Radiation as completely as possible into blue radiation of a fourth spectrum converts.

In this embodiment, the

Lighting device particularly preferably three different absorber materials, wherein the one absorber material

For example, the half-width of the second peak by absorption of electromagnetic radiation of the second peak, another absorber material, the half-width of the third peaks by absorption of electromagnetic

Radiation of the third peak and yet another

Absorber material reduces the half-width of the fourth peak by absorbing electromagnetic radiation of the fourth peak. Furthermore, the illumination device preferably also has an additional absorber material which can absorb ultraviolet radiation.

Furthermore, it is also possible in this embodiment that the one absorber material is provided to

Electromagnetic radiation between the first peak and the second peak to absorb and the further absorber material is provided to absorb electromagnetic radiation between the second and the third peak.

For example, the absorber material converts the absorbed electromagnetic radiation into heat. For example, nanoparticles, especially nanoparticles, are made of one

Semiconductor material or have a semiconductor material suitable as absorber materials. Furthermore, interference filters are suitable as absorber materials. The interference filter can be in the form of particles or as

Platelets present. Furthermore, the interference filter can also be vapor-deposited on a housing in the one

Semiconductor body is introduced.

Furthermore, it is also possible that the absorber material, the absorbed electromagnetic radiation in

electromagnetic radiation of another

Wavelength range converted. In other words, the absorber material itself can also

be formed wavelength converting. For example, inorganic or organic phosphors are used as absorber materials. In particular, if a phosphor is used as the absorber material, the appearance of the illumination device can be influenced in a desired manner.

The following materials may be used as organic phosphors: acridine dyes, acridinone dyes, anthraquino dyes, anthracene dyes, cyanine dyes, dansyl dyes, squaryllium dyes,

Spiropyrans, boron-dipyrromethene (BODIPY), perylenes, pyrenes, naphthalenes, flavins, pyrroles, porphyrins and theirs

Metal complexes, diarylmethane dyes, triarylmethane dyes, nitro and nitroso dyes, phthalocyanine dyes, and the metal complexes of phthalocyanines, quinones, azo dyes, indophenol dyes, oxazines, oxazones, thiazines and thiazoles, xanthenes, fluorenes , Flurone, Pyronine, Rhodamine, Coumarine. As inorganic phosphors come for example

Transition metals, rare earth oxides, sulfides or cyanides in question. Also, the following materials are suitable as inorganic phosphor: rare earth doped garnets, rare earth doped ones

Alkaline earth sulfides, rare earth doped thiogallates, rare earth doped aluminates, rare earth doped silicates, rare earth doped orthosilicates, rare earth doped chlorosilicates, rare earth doped alkaline earth silicon nitrides, rare earth doped oxynitrides, rare earth doped

Aluminum oxynitrides doped with rare earths

Silicon nitrides, rare earth doped sialons. Furthermore, the absorber material may also be an inorganic pigment.

Is it the absorber material to a

wavelength-converting absorber material, such as an organic or inorganic phosphor, the absorber material converts the absorbed radiation particularly

preferably in radiation of a wavelength range which is closer to the local maximum intensity of the peak, than the wavelength range of the absorbed radiation. In this way, the half-width of the peak can be reduced particularly effectively.

If the absorber material is an inorganic material, such as an inorganic phosphor or semiconductor material, the absorber material is preferably in the form of particles. inorganic

Phosphor particles preferably have a diameter between 1 micron and 50 microns inclusive. Particular preference is given to inorganic

Fluorescent particles have a diameter of between 2 microns and 20 microns inclusive. Particles of a semiconductor material preferably have a diameter of between 5 nanometers and 5 micrometers inclusive. Particular preference is given to particles of a

Semiconductor material has a diameter of between 5 nanometers and up to and including 50 nanometers. Particles of an inorganic pigment preferably have one

Diameter between 20 nm and inclusive

including 20 microns.

Furthermore, it is also possible that the absorber material is introduced into a porous matrix material. The porous one Matrix material is particularly preferably formed inorganic. Particularly preferably, the absorber material is on a surface of the pores of the inorganic porous

Applied matrix material. For example, that is

Absorber material applied in the form of particles on the surface of the pores. In particular inorganic

Absorber materials may be present as particles and adsorbed on the surface of the pores. organic

Absorber materials, such as organic

For example, phosphors may be adsorbed in molecular form on the surface of the pores.

The pores of the inorganic matrix material are usually voids in the inorganic

Matrix material. The cavities may be ordered or disordered in the inorganic matrix material.

For example, the pores of the inorganic

Matrix material has a mean diameter between

including 2 nm and up to and including 50 nm. Such inorganic materials are also referred to as mesoporous inorganic materials. Furthermore, it is also possible that the pores of the inorganic

Matrix material has a mean diameter between

including 50 nanometers and including 1000 nanometers. Such inorganic materials are also referred to as microporous inorganic materials.

As the inorganic matrix material, for example, a zeolite, an A1P04-5 host system or porous ceramics

be used. The porous ceramics may comprise, for example, one of the following materials or one of the following consist of the following materials: alumina, titania, zirconia, silica, hafnia.

According to one embodiment, the porous matrix material is formed as a plurality of particles. For example, the particles may have a diameter between 20 microns and 100 microns inclusive.

Furthermore, it is also possible that the diameter of

Particles of the inorganic matrix material between

including 20 nm and between 50 nm inclusive.

Furthermore, the absorber materials can also be introduced into a glass.

According to a further embodiment, the absorber material is introduced into a matrix material, dissolved or covalently bonded to the matrix material. As a matrix material can

For example, a polymer can be used. For example, the matrix material may be a silicone or an epoxide. For example, as the absorber material, an organic phosphor can be used which is covalently bonded via a functional group to the matrix material, such as, for example, silicone or epoxide. One

Matrix material with a covalently bonded or dissolved absorber can, for example, as a volume encapsulation of a

Semiconductor body be formed.

The absorber material preferably has a concentration of between 0.00001 mol / g inclusive and 0.1 mol / g inclusive in the matrix material. The conversion element may comprise, for example, an organic matrix material, such as epoxy or silicone, in which particles of a phosphor are introduced. The

Particles of the phosphor give the conversion element in this case the wavelength-converting properties.

For example, the conversion element may be formed here as a thin plate. Such a conversion element is also referred to as resin-based platelets. Furthermore, the conversion element as a casting of a

Semiconductor body be formed.

As the phosphor for the conversion element, for example, one of the above-mentioned wavelength-converting

Absorber materials suitable.

Furthermore, it is also possible that a

Wavelength-converting ceramic plate as

Conversion element is used. Such a ceramic wavelength-converting plate is formed, for example, of a ceramic phosphor.

Furthermore, it is also possible that the absorber material is likewise encompassed by the conversion element.

For example, the absorber material may be incorporated into the organic matrix material of the conversion element in addition to the phosphor particles. Alternatively, the absorber material can be the conversion element in the light path of the

Subordinate semiconductor body. In particular, absorber materials incorporated in a particulate porous inorganic matrix material are capable of being incorporated into an organic matrix material. The organic matrix material with the particulate porous matrix material can be processed by printing, for example. In the organic

Matrix material can be next to the particles of the porous

Matrix material furthermore also phosphor particles

be introduced.

The lighting device is in particular as

Backlight for a display or a TV

suitable .

A display or a television therefore preferably has a lighting device described here for backlighting and furthermore a color filter system. The color filter system has a blue filter that blocks the light of the

Whole spectrum filters to light a first transmission spectrum. Furthermore, the color filter system has a green filter, which filters the light of the entire spectrum to light of a second transmission spectrum, and a red

Filter that filters the light of the entire spectrum to light a third transmission spectrum. Furthermore, it is also possible that the color filter system has an additional yellow filter, which filters the light of the total spectrum to light of a fourth yellow transmission spectrum. The first transmission spectrum is particularly preferably in the blue spectral range, the second transmission spectrum is particularly preferably in the green spectral range and the third transmission spectrum is particularly preferably in the red spectral range.

The color filter system thus particularly preferably comprises at least three different filters, namely the green ones

Filter, the red filter and the blue filter. The blue filter is particularly preferably only transparent to blue light, in particular to light of the first peak of the entire spectrum. The green filter is particularly preferably only transparent to green light, in particular to light of the second peak of the entire spectrum. The red filter is particularly preferably only transparent to red light, in particular to light of the third peak of the entire spectrum. Optionally, the color filter system may include a fourth filter that is only transmissive to yellow light.

According to one embodiment, a point corresponding to the color impression of the first transmission spectrum in the CIE color diagram, one to the color impression of the second

Transmission spectrum corresponding point in the CIE color diagram and to the color impression of the third

Transmission spectrum corresponding point in the CIE color diagram, a color triangle within the CIE standard diagram, which has a coverage of at least 90% with one of the following color triangles: Adobe RGB color triangle, NTSC color triangle, sRGB color triangle.

As Adobe RGB color triangle here is the triangle

within the CIE color chart 1931, which is spanned by the following points: (0.640, 0.330),

(0.210, 0.710) and (0.150, 0.060).

As NTSC color triangle herein the triangle within the CIE color chart 1931 is designated by the

(0.670, 0.330), (0.210, 0.710) and (0.140, 0.080). As sRGB color triangle in the present case, the triangle within the CIE color diagram 1931 is designated by the

(0,640, 0,330), (0,300, 0, 600) and (0,150, 0, 60).

The spanned by the three transmission spectra

Color triangle in the CIE color chart is usually spanned by a blue dot in the blue area, a green dot in the green area, and a red dot in the red area. The blue dot is usually determined by the peak of the first transmission spectrum with maximum intensity, while the green dot is usually determined by the peak of the second transmission spectrum with maximum intensity and the red dot by the peak of the third transmission spectrum with maximum intensity ,

Further advantageous embodiments and developments of the invention will become apparent from the embodiments described below in conjunction with the figures.

On the basis of the schematic sectional views of Figures 1 to 4, two embodiments of a

Lighting device described.

On the basis of the schematic sectional views of Figures 5 to 7, a further embodiment of a lighting device is described in each case.

FIG. 8 shows by way of example and schematically

Total spectrum, as it of a conventional lighting device (curve A, dotted) and a lighting device according to a Embodiment (curve B, solid line) is emitted.

An exemplary embodiment of an absorber material will be described with reference to the schematic sectional views of FIGS. 9 and 10.

With reference to the schematic sectional views of Figure 11, a display or a television according to an embodiment will be described.

Figure 12 shows the Adobe RGB standard triangle (curve 0,

dashed line), a schematic representation of a color triangle, by a color filter system in conjunction with a conventional

Lighting device (curve A, dotted), as well as two color triangles, each by a color filter system in conjunction with a lighting device according to a

Embodiment (curve B, dashed / dotted and C, solid) are generated.

The same, similar or equivalent elements are provided in the figures with the same reference numerals. The figures and the proportions of the elements shown in the figures with each other are not to scale

consider. Rather, individual elements, in particular layer thicknesses, can be shown exaggeratedly large for better representability and / or better understanding.

The illumination device 1 according to the embodiment of FIG. 1 comprises a multiplicity of light-emitting diodes 2, which are applied to a carrier 3. Each LED 2 has In this case, a component housing 4 with a recess. On the bottom of the recess is one each

radiation-emitting semiconductor body 5 mounted. The radiation-emitting semiconductor body 5 is in this case

in this case suitable for emitting electromagnetic radiation having a first spectrum which has a first peak 6 from the blue spectral range.

FIG. 2 shows by way of example how a light-emitting diode 2 of FIG

Lighting device 1 according to the figure 1 in detail

can be designed. The semiconductor body 5 of

Light-emitting diode 2 is surrounded by a matrix material 7, which is, for example, a silicone or an epoxide. In the matrix material 7, a phosphor 8 is introduced, which is suitable, the blue radiation with the first spectrum, which includes the first peak 6, in electromagnetic radiation of a second spectrum

to convert, which has the second peak 9. The second peak 9 lies in the green spectral range. In addition, the matrix material 7 comprises a further phosphor 8 ', which is suitable for electromagnetic radiation of the

Semiconductor body 5 with the first spectrum in

electromagnetic radiation having a third spectrum having the third peak 10 to convert. The third peak 10 is in the red spectral range.

The matrix material 7, which serves as encapsulation of the semiconductor body, is thus due to the phosphors 8, 8 'as

Conversion element 11 is formed. The conversion element 11 is due to the two phosphors 8, 8 'suitable for the electromagnetic radiation with the first spectrum

partly in electromagnetic radiation with the second spectrum and partly in electromagnetic radiation with to transform the third spectrum. A certain part of the

Radiation of the first spectrum, which is emitted by the semiconductor body 5, passes through the casting unconverted. The light-emitting diode 2 thus emits mixed-colored light, which is composed of electromagnetic radiation with the first spectrum, of electromagnetic radiation with the second spectrum and of electromagnetic radiation with the third

Spectrum composed. Furthermore, the encapsulation in the present case comprises an absorber material 12, which forms part of the radiation of the second peak 9

absorbs and thus reduces the half-width of the second peak 9. In addition, the encapsulation in the present case comprises a further absorber material 12 ', which differs from the first

Absorber material 12 is different. The further

Absorber material 12 'is suitable for absorbing electromagnetic radiation of the third peak 10, so that the half-width of the third peak 10 is also reduced. Alternatively, it is also possible that the first

Absorber material 12 is adapted to absorb electromagnetic radiation of the total spectrum, the

Wavelength between the first peak 6 and the second peak 9 is in the cyan spectral range. In this case, the first absorber material 12 preferably does not absorb radiation from the wavelength range of the half-width of the first peak 6 and the second peak 9. The second absorber material 12 'in this alternative is furthermore preferably suitable for absorbing radiation of the entire spectrum, the

Wavelength between the second peak 9 and the third peak 10 in the yellow spectral range. The second absorber material 12 'preferably also does not absorb radiation here the wavelength range of the half width of the first peak 6 and the second peak 9.

Figures 3 and 4 show schematic sectional views of two different LEDs 2, as they can be used alternatively in the lighting device 1 according to the figure 1. Particularly preferred are the

LEDs 2 according to the figure 3 and the LEDs 2 according to the figure 4 alternately on the support 3 of

Illuminating device 1 according to the figure 1 arranged.

The light-emitting diode 2 according to the exemplary embodiment of FIG. 3 has a potting comprising a phosphor 8. The potting is thus also formed as a conversion element 11 in the light-emitting diode 2 of Figure 3. The phosphor 8 is suitable for electromagnetic radiation of the first

Spectrum with the first peak 6 partially in

to convert electromagnetic radiation of the second spectrum with the second peak 9. The second spectrum with the second peak 9 lies in the green spectral range.

Furthermore, the encapsulation comprises an absorber material 12 'which, for example, absorbs part of the radiation of the green peak 9 and thus reduces its half width.

Furthermore, it is also possible for the absorber material 12 'to be suitable for absorbing electromagnetic radiation between the first peak 6 and the second peak 9.

In contrast to the light-emitting diode 2 according to FIG. 3, the light-emitting diode 2 according to the exemplary embodiment of FIG. 4 has a phosphor 8 'which converts radiation of the first spectrum with the first peak 6 into radiation of the third spectrum with the third peak 10. The third spectrum with the third peak 10 lies in the red spectral range. Furthermore, the encapsulation comprises an absorber material 12 which, for example, absorbs part of the radiation of the red peak 10 and thus reduces its half width.

Furthermore, it is also possible for the absorber material 12 to be suitable for absorbing electromagnetic radiation between the second peak 9 and the third peak 10.

The illumination device 1 according to the exemplary embodiment of FIG. 5 has a carrier 3 on which a multiplicity of similar semiconductor bodies 5 are applied. The

Semiconductor bodies 5 are suitable for emitting electromagnetic radiation having a first spectrum which has a first peak 6 in the blue spectral range. One of the semiconductor body 5 is in this case with a

Conversion element 11 provided, which is presently designed as a small plate. For example, it may be a

resin-based tile or act on a ceramic tile. The plate is in direct contact with the

Radiation exit surface of the semiconductor body 5

applied. The converter plate 11 is suitable for the first radiation of the semiconductor body 5 from the blue

Spectral range as completely as possible into electromagnetic radiation with the second spectrum to convert. The second spectrum in this case has a second peak 9, which lies in the green spectral range. The semiconductor body 5 with the converter plate 11 is further surrounded by a potting material, are introduced into the absorber particles 12 '. The absorber particles 12 'are suitable, for example, to reduce the half-width of the green peak 9 by absorbing part of the radiation of the green peak 9. The conversion element 11 is arranged downstream of the semiconductor body 5 in its light path. Furthermore, that is

Absorber material 12 'downstream of the conversion element 11 in the light path of the semiconductor body 5. The light of the

Semiconductor body in other words first passes through the conversion element 11 and is possible from this

completely converted into radiation of another wavelength range. Thereafter, the converted radiation passes through the absorber material 12.

Another semiconductor body 5 is connected to another

Conversion element 11 provided, which is also formed as a plate and in direct contact with the

Radiation exit surface of the semiconductor body 5 is applied. The conversion element 11 is suitable, the

Radiation of the semiconductor body 5 with the first spectrum as completely as possible to convert into electromagnetic radiation with the third spectrum. The third spectrum has a third peak 10 from the red spectral range. The further semiconductor body 5 is further of a

Surrounding potting material, in the absorber material 12 in

Particle form is introduced. For example, the absorber material 12 is capable of reducing the half-width of the red peak 10 by absorbing a portion of the red peak 10 radiation. Furthermore, it is also possible that the absorber material 12 is suitable for

electromagnetic radiation between the second peak 9 and the third peak 10 to absorb. Another

Semiconductor body 5 is free of a conversion element 11 and an absorber material 12, 12 '.

The lighting device 1 according to the embodiment of Figure 6 in turn comprises a plurality of Semiconductor bodies 5, 5 '. In this case, however, the semiconductor bodies 5, 5 'differ from each other. One of

Semiconductor body 5 is suitable for electromagnetic radiation with a first spectrum from the blue

Send out spectral range. On the

Radiation exit surface of the semiconductor body 5, a conversion element 11 is applied, which forms part of the

Radiation with the first spectrum converts into electromagnetic radiation with the third spectrum. The third spectrum here has a third peak 10 in the red

Spectral range on. Furthermore, the semiconductor body 5 and the conversion element 11 are surrounded by a potting, are introduced into the absorber particles 12 '. The

For example, absorber material 12 'is capable of reducing the half width of the red peak 10 by absorbing a portion of the red peak 10 radiation.

Furthermore, it is also possible for the absorber material 12 'to be suitable for absorbing electromagnetic radiation between the second peak 9 and the third peak 10.

The conversion element 11 is arranged downstream of the semiconductor body 5 in its light path. Furthermore, that is

Semiconductor body 5, in other words, first passes through the conversion element 11 and is partially in. From this

Converted radiation of another wavelength range. After that, the converted radiation and the

unconverted the absorber material 12. Another semiconductor body 5 'on the carrier 3 is free of a conversion element 11 and an absorber material 12, 12'. This semiconductor body 5 'is suitable for operating electromagnetic radiation with a second Emitting spectrum having a second peak 9 in the green spectral range.

The illumination device 1 according to FIG. 7 differs from the illumination device 1 according to FIG. 6 in that the semiconductor body 5 which emits blue radiation is free of a conversion element 11 and instead the semiconductor body 5 'which emits electromagnetic radiation out of the green spectral range , is provided with a conversion element 11. The conversion element 11 converts part of the radiation of the second spectrum into radiation having a third spectrum, the third spectrum having a third peak 10 in the red spectral range. The semiconductor body 5 'with the conversion element 11 is further surrounded by a potting material, in which an absorber material 12 is introduced. For example, the absorber material 12 again absorbs part of the red peak 10 so that its half width is reduced.

Furthermore, it is also possible that the

Absorber material 12 'is suitable for electromagnetic

Radiation between the second peak 9 and the third peak 10 to absorb.

FIG. 8 shows, by way of example, an overall spectrum (curve B, solid line), as it can be emitted by the illumination device 1 according to FIG. The

The total spectrum is composed of the first spectrum with the first peak 6, the second spectrum with the second peak 9 and the third spectrum with the third peak 10. The third peak 10 is in this case by means of a

Conversion element 11 generates, while the first peak 6 and the second peak 9 each originate from a semiconductor body 5, 5 '. The first spectrum with the first peak 6 is in the blue spectral range and has a local maximum at a wavelength λ1 _ιη3χ of about 450 nanometers. The

Half-width of the first peak is approximately 20 nanometers.

The second spectrum with the second peak 9 is in the green spectral range and has a local maximum at a wavelength λ2 _ιηειχ of about 530 nanometers. The

Half width of the second peak 9 is about 35

Nanometers.

The third spectrum with the third peak 10 is in the red spectral range and has a local maximum at a wavelength λ3 _ιηειχ of about 660 nanometers. The

Half width of the third peak 10 is about 90

Nanometers. The half-width of the third peak 10 is reduced due to the absorber material 12.

FIG. 8 furthermore shows the overall spectrum of a

conventional illumination device without absorber material 12, 12 'shown (curve A). This total spectrum is also composed of the first spectrum with a first peak 6 in the blue spectral range, a second spectrum with a second peak 9 in the green spectral range and a third spectrum with a third peak 10 'in the red spectral range. In particular, the third spectrum with the third peak 10 'differs from the third spectrum with the third peak 10 according to the curve B. Thus, the local maximum of the peak 10' is shifted towards shorter wavelengths and lies at a wavelength λ3 ' _ιηειχ of about 640

Nanometers. In particular, however, the half-width of the third peak 10 'according to the curve A is compared to the

Half width of the third peak 10 according to the curve B to widened about 20 nanometers. The use of the absorber material 12, 12 'thus leads in the exemplary embodiment according to FIG. 6 to a narrowing of the third peak 10' of the red radiation of approximately 20 nanometers.

FIG. 9 shows an inorganic porous matrix material 13 according to an embodiment which is in the form of particles, while FIG. 10 shows a schematic

Sectional view through the pores 14 of the inorganic porous matrix material 13 represents. On the surface of the pores 14 are spaced apart particles of a

Absorber material 12 applied. For example, the absorber material 12 may be a material that converts absorbed electromagnetic radiation into heat or into light of another wavelength.

The display according to FIG. 11 has a

Lighting device 1, as has already been described with reference to the figures 1 to 4. Furthermore, this includes

Display according to the figure 11, a filter system 15, the red

Filter 16, green filter 17 and blue filter 18 includes. The blue filters 18, the green filters 17 and the red filters 16 of the color filter system 15 serve to form subpixels of the

Define displays. The filter system 15 is the

Semiconductor bodies 5 downstream in the emission direction. All the electromagnetic radiation that comes from

Radiation of the first spectrum, of radiation of the second spectrum and of radiation of the third spectrum

The blue filter 18 filters the light of the total spectrum to light a first transmission spectrum from the blue

Spectral range. The green light and the red light of the total spectrum are preferred here as possible completely absorbed by the blue filter 18. The green filter 17 of the color filter system 15 filters the light of the entire spectrum into light of a second transmission spectrum from the green spectral range. The blue light and the red light of the total spectrum are preferably absorbed as completely as possible by the green filter 17. If the light of the entire spectrum passes through the red filter 16, the red filter 16 filters the entire electromagnetic radiation with the entire spectrum into light of a third one

Transmission spectrum from the red spectral range. The blue light and the green light of the total spectrum are preferably absorbed as completely as possible by the red filter 16. The display according to FIG. 11 can also be used as a television

be educated.

FIG. 12 shows different color triangles, which by means of

spanned by different transmission spectra

(Curves A, B, C). The transmission spectra are here by various lighting devices 1 with

generated different total spectra. FIG. 12 also shows for comparison the Adobe RGB standard triangle (curve 0). In the lighting device whose electromagnetic radiation in conjunction with a color filter system 15 a

Spanning color triangle according to curve A, it is a conventional lighting device without absorber material 12, 12 '. The lighting device 1, whose

electromagnetic radiation in conjunction with a

Color filter system 15 spans a color triangle according to curve B, has a low concentration of absorber material 12, 12 ', while the lighting device 1, whose

electromagnetic radiation in conjunction with a Color filter system 15 spans a color triangle according to curve C, a high concentration of absorber material 12, 12 'contains. The concentration of the particles of the absorber material 12, 12 'in the potting of the light emitting diodes of the lighting device 1 according to curve B is smaller by a factor of 10 than the concentration of the particles of the absorber material 12, 12' in the potting of the light emitting diodes of the lighting device 1 according to curve C. Die Invention is not by the description based on

Embodiments limited to 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 this combination itself is not explicitly described in the claims

Claims or embodiments is given.

This patent application claims the priority of German Patent Application 102013103984.7, the disclosure of which is hereby incorporated by reference.

Claims

claims

Lighting device (1) for backlighting a display or a television, wherein the

Lighting device (1) emits in operation electromagnetic radiation with a total spectrum having a first peak (6), a second peak (9) and a third peak (10), wherein

- At least the electromagnetic radiation of one of the peaks (6, 9, 10) is generated by means of a conversion element (11), and

- The illumination device comprises an absorber material (12, 12 '), which has a predetermined spectral range of the

Total spectrum absorbed.

2. Lighting device (1) after the previous one

Claim,

in which the predetermined spectral range is part of the peak (6, 9, 10) generated by means of the conversion element (11) and reduces a half-width of this peak (6, 9, 10), in that the absorber material (12, 12 ') absorbs part of the radiation of the peak (6, 9, 10).

3. Lighting device (1) after the previous one

Claim,

in which the half-width of the peak (6, 9, 10) is reduced by at least 0.5 nanometers due to the absorption of the absorber material (12, 12 ').

4. Lighting device (1) according to one of the above

Claims,

in which the first peak (6) in the blue spectral range, the second peak (9) in the green spectral range and the third peak (10) lie in the red spectral range and the half width of the green peak (9) and / or the red peak (10) by means of the absorber material (12, 12 ') is reduced.

5. Lighting device according to claim 1, wherein

which absorbed by the absorber material (12, 12 ')

Spectral range of the total spectrum between two directly adjacent peaks (6, 9, 10).

6. Lighting device according to the preceding claim, wherein

the first peak (6) in the blue spectral range, the second peak (9) in the green spectral range and the third peak (10) in the red spectral range and the absorber material have a predetermined spectral range between the first peak (6) and the second peak (9 ) from the cyan spectral range or a predetermined spectral range between the second (9) peak and the third peak (10) from the yellow

Absorbed spectral range.

7. Lighting device (1) according to one of the above

Claims, with:

- A semiconductor body (5, 5 '), in operation

emitting electromagnetic radiation having a first spectrum having the first peak (6),

- A conversion element (11), the electromagnetic radiation with the first spectrum partially in

electromagnetic radiation having a second spectrum having the second peak (9), and partially in

electromagnetic radiation having a third spectrum having the third peak (10) converts.

8. Lighting device (1) according to one of claims 1 to 6, with:

- A semiconductor body (5, 5 '), in operation

- Another semiconductor body (5, 5 '), the electromagnetic radiation in operation with the first spectrum

having the first peak (6), wherein in the light path of the further semiconductor body (5, 5 ') a

Conversion element (11) is arranged, which is the

electromagnetic radiation of the first spectrum of the

further semiconductor body (5, 5 ') partially in

9. lighting device (1) according to one of claims 1 to 7, comprising:

- A semiconductor body (5, 5 '), in operation

Conversion element (11) is arranged, which is the

electromagnetic radiation of the first spectrum in

converts electromagnetic radiation of the second spectrum, and

which has the first peak (6), wherein in the light path of the further semiconductor body (5, 5 '), a further conversion element (11) is arranged, which the electromagnetic radiation of the first spectrum in

electromagnetic radiation of the third spectrum converts.

10. Lighting device (1) according to one of the above

Claims,

wherein the absorber material (12, 12 ') converts the absorbed electromagnetic radiation into heat.

11. Lighting device (1) according to the preceding claim, in which as the absorber material (12, 12 ') nanoparticles or

Interference filters are used.

12. Lighting device (1) according to one of claims 1 to 10,

wherein the absorber material (12, 12 ') converts the absorbed electromagnetic radiation into electromagnetic radiation of another wavelength range.

13. Lighting device (1) according to one of the above

Claims,

in which the absorber material (12, 12 ') is introduced into an inorganic porous matrix material (13).

14. Lighting device (1) according to the preceding claim, wherein the inorganic porous matrix material (13) as a

Variety of particles is formed.

15. Lighting device (1) according to one of claims 1 to 12,

in which the absorber material (12, 12 ') in one

Matrix material (7) is dissolved or covalently attached to the

Matrix material (7) is bound.

16. Lighting device (1) according to one of the above

Claims,

in which the conversion element (11) is an organic

Matrix material (7), in the particle of a

Phosphor (8, 8 ') are introduced.

17. Lighting device (1) according to one of claims 1 to 15,

in which a wavelength-converting ceramic plate is used as the conversion element (11).

18. Lighting device (1) according to one of the above

Claims,

in which the absorber material (12, 12 ') of the

Conversion element (11) is included.

19. Display or TV with:

- A lighting device (1) according to one of the above claims, and

- Color filter system (15) comprising a blue filter (18) which filters the light of the entire spectrum, to light a first transmission spectrum, a green filter (17), the light of the entire spectrum to light a second

Transmission spectrum filters and a red filter (16), which filters the light of the total spectrum to light a third transmission spectrum.

20. Display or television according to the previous claim, in which a to the color impression of the first

Transmission spectrum corresponding point in the CIE color diagram, one to the color impression of the second

Transmission spectrum corresponding point in the CIE color diagram and to the color impression of the third Transmission spectrum corresponding point in the CIE color diagram spans a color triangle within the CIE standard diagram, which has a coverage of at least 90% with one of the following color triangles: Adobe RGB color triangle, NTSC color triangle, sRGB color triangle.