CN114079507A - Visible light communication lighting source - Google Patents
Visible light communication lighting source Download PDFInfo
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- CN114079507A CN114079507A CN202010808730.XA CN202010808730A CN114079507A CN 114079507 A CN114079507 A CN 114079507A CN 202010808730 A CN202010808730 A CN 202010808730A CN 114079507 A CN114079507 A CN 114079507A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/502—LED transmitters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Abstract
The invention protects a visible light communication lighting source. The visible light communication illumination light source comprises a first light source and a second light source, wherein the first light source and the second light source respectively emit first light and second light, the wavelength ranges of the first light and the second light are both in the visible light range, and the first light and the second light are mixed to form white light; the first light source and the second light source are respectively driven by different electric signals, and communication modulation signals are loaded on the electric signals for driving the first light source and are used for optical communication; the luminous flux of the first light source is smaller than that of the second light source. The visible light communication illumination light source combines the low-power communication first light source and the high-power illumination second light source for use, so that the visible light communication illumination light source has the characteristics of high-power illumination and high-speed optical communication.
Description
Technical Field
The invention relates to the field of visible light communication, in particular to a visible light communication illumination light source suitable for high-power illumination conditions.
Background
The Visible Light Communication (VLC) technology is a Communication method for directly transmitting an optical signal in the air by using Light in a Visible Light band as an information carrier. The visible light communication technology is green and low-carbon, can realize nearly zero-energy-consumption communication, can effectively avoid the defects of leakage of radio communication electromagnetic signals, influence of electromagnetic waves on precision instruments and the like, and quickly constructs an anti-interference and anti-interception safety information space.
Meanwhile, compared with conventional incandescent lamps, fluorescent lamps and the like, the white light LED lamp can support faster switching speed and perform higher-speed data transmission.
In the prior art, a modulated optical signal is generally transmitted by using illumination light of a white LED, and an optical signal receiver receives the modulated optical signal and converts the modulated optical signal into an electrical signal to output, thereby completing optical communication. Specifically, the method comprises the following steps: the white lighting light is formed by mixing LED blue light and yellow fluorescent light excited by fluorescent materials, and the emitted fluorescent light has afterglow problem and can not realize high-speed optical communication, so that in order to improve the bandwidth, an optical filter is generally required to be added in front of an optical signal receiver to filter out a fluorescent spectrum, and only the residual LED blue light is accepted as signal detection light.
However, as the power required by illumination increases, the junction capacitance of the LED chip also increases, and a high-speed electrical signal cannot be loaded thereon, so that high-speed optical communication cannot be realized.
Therefore, it is desirable to provide a visible light communication illumination source that can maintain high power illumination while still achieving high speed optical communication.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a visible light communication light source with high-power illumination and high-speed light communication effects.
The invention provides a visible light communication lighting source, which comprises a first light source and a second light source, wherein the first light source and the second light source respectively emit first light and second light, the wavelength ranges of the first light and the second light are both in the visible light range, and the first light and the second light are mixed to form white light; the first light source and the second light source are driven by respectively and independently receiving electric signals, the electric signals received by the first light source are loaded with communication modulation signals and are used for optical communication, the second light source is generally not loaded with communication modulation signals and is mainly used for illumination, and the luminous flux of the first light source is smaller than that of the second light source.
When the visible light communication illumination light source is applied to a visible light communication system, the visible light communication system further comprises an optical signal receiver, and an optical filter is arranged in front of the optical signal receiver and used for blocking the second light and transmitting the first light.
In the technical scheme of the invention, the first light and the second light are combined into the mixed white light for high-power illumination, wherein the corresponding second light source is mainly used for illumination and has larger luminous flux; the visible light communication illumination light source can meet the requirements of high-power illumination and high-speed optical communication at the same time under the combined action of the two.
Preferably, the first light emitted by the first light source is blue light with a peak wavelength between 430 and 480nm, the corresponding first light source can be a blue laser or a blue LED, and the laser and LED light sources can support a faster switching speed compared with a common incandescent lamp or fluorescent lamp, so as to meet the requirement of higher-speed optical communication. The wavelength range of the second light emitted by the corresponding second light source covers 480-700nm, and the second light source can be an LED light source or a light source formed by exciting fluorescent powder by a blue LED.
Preferably, the first light emitted by the first light source is red light with a peak wavelength of 600-700nm, and the corresponding first light source can be a red laser or a red LED light source. The wavelength range of the second light emitted by the corresponding second light source covers 430-700nm, and the second light source can be a light source formed by exciting fluorescent powder by a blue light LED.
Preferably, the second light source is formed by exciting a phosphor layer by a blue LED, and the phosphor layer is disposed on a light path of the first light emitted by the first light source. The first light emitted by the low-power first light source and the light emitted by the high-power LED chip in the second light source are emitted out through the same fluorescent powder layer.
Preferably, the visible light communication illumination light source of the present invention includes a plurality of second light sources, the plurality of second light sources are regularly arranged in a dot matrix, and a plurality of first light sources are uniformly distributed among the plurality of second light sources regularly arranged in the dot matrix, so that the first light and the second light emitted by the two light sources are uniformly mixed.
Preferably, the visible light communication illumination light source of the present invention comprises a plurality of second light sources, and the plurality of second light sources are regularly arranged in a lattice; the light source also comprises a scattering light guide strip which is arranged at the periphery of the second light source; the light that first light source sent is coupled to the scattering leaded light strip in, and light transmits the limit scattering in the scattering leaded light strip to make first light and the even mixing of second light that first light source and a plurality of second light source launched respectively.
Compared with the prior art, the invention has the following beneficial effects: the visible light communication lighting source is additionally provided with a first light source which has low power and mainly plays a role in optical communication besides a second light source which mainly plays a role in high-power lighting, and high-speed optical communication is realized by utilizing the characteristic that the first light source has high switching speed; meanwhile, the spectral ranges of the first light and the second light emitted by the first light source and the second light source are matched with each other, and the first light and the second light are mixed to emit white light, so that high-power illumination is realized.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention.
Fig. 1 is a schematic structural diagram of a visible light communication system.
FIG. 2 is a spectral combination of illumination white light in one embodiment of the present invention.
FIG. 3 is a spectral combination of illumination white light in another embodiment of the present invention.
Fig. 4a and 4b are different application scenarios of the visible light communication illumination light source in the bulb lamp according to embodiment 1 of the present invention.
Fig. 5a and 5b are different applications of the visible light communication illumination source in the panel light according to embodiment 2 of the present invention.
Fig. 6 shows an application of the visible light communication lighting source in the directional lighting fixture in embodiment 3 of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and the embodiments.
The visible light communication combines illumination and communication, and the LED lamps which are gradually popularized have higher switching speed, so that the visible light communication is enabled again; however, as the power required by illumination is larger and larger, the junction capacitance corresponding to the LED chip is also larger and larger, and a problem that a high-speed signal cannot be loaded and high-speed optical communication cannot be realized occurs. How to realize the effect of high-speed optical communication under high-power illumination is a very worthy of research.
Most of the existing LED lighting sources cover fluorescent powder on a blue LED chip, and white light lighting is realized by mixing light. Because of the problem of afterglow of fluorescence, the fluorescence is generally not used as an optical signal of optical communication; then, to increase the bandwidth, a filter is usually added in front of the optical signal receiver to filter the fluorescence, and the end result is that the remaining blue light (about 10%) transmitted through the phosphor in the blue light emitted from the blue LED chip is used as the optical signal for information transmission.
The invention starts from the characteristic, the visible light communication light sources are creatively divided into two groups, and one group can be regarded as a high-power fluorescent light source to meet the requirement of illumination; the other group is a low-power communication light source which can be modulated at high speed, so that the requirement of high-speed optical communication is met; meanwhile, the two groups of light sources have different spectrums and form white light after mixing.
As shown in fig. 1, a visible light communication system includes the visible light communication illumination light source (shown in a dashed line box) of the present invention, which includes a first light source and a second light source, the first light source and the second light source are respectively driven by different electrical signals, and then the first light source and the second light source respectively emit first light and second light, both of which have wavelength ranges within the visible light range (420 nm and 700 nm).
The spectrums of the first light and the second light are different, and the first light and the second light are combined to form white light; in particular, the luminous flux of the second light source is much larger than the luminous flux of the first light source, for example, the luminous flux of the second light source may be set to 5 times the luminous flux of the first light source.
For the optical communication part, a modulation signal for communication is additionally loaded on a first light source with low power, and a modulation signal for communication is generally not loaded on a second light source and is mainly used as an illumination light source; correspondingly, an optical filter is arranged in front of the optical signal receiver, the optical filter absorbs or reflects second light emitted by the second light source through first light with communication information emitted by the first light source, and the optical signal receiver receives modulated optical signals, converts the modulated optical signals into electric signals and outputs the electric signals to complete optical communication. In some embodiments of the present invention, the second light source may also be loaded with a low frequency modulation signal, in addition to the high frequency communication modulated first light source.
From the above, the first light source is mainly used for loading communication signals and adjusting color temperature for obtaining white light, and has low luminous flux, and the first light source usually adopts an LED light source or an LD light source, and realizes high-speed optical communication by using the characteristic of fast switching of the switches of the LED light source or the LD light source; the second light source is mainly used for illumination and has a large luminous flux.
The combination of the two light sources is further described below:
as shown in fig. 2, the white light spectrum of the illumination after the first light and the second light emitted by the first light source and the second light source are combined, wherein the first light is a blue light with a peak wavelength between 430 and 480nm, and the corresponding first light source may be a laser light source or an LED light source; the wavelength range of the second light covers 480-700nm, and the corresponding second light source can be an LED light source or a light source formed by exciting fluorescent powder by a blue LED.
Alternatively, as shown in FIG. 3, where the first light is red light with a peak wavelength between 600 and 700nm, the corresponding first light source can be a laser light source or an LED light source; wherein the wavelength range of the second light covers 430-700nm, and the corresponding second light source can be a light source formed by exciting fluorescent powder by a blue light LED; in the traditional LED illumination, only the blue LED excites the yellow fluorescent powder YAG to form the white illumination light, but the white illumination light lacks red light components and has poor color rendering index.
In this combination, it is preferable to add a filter for filtering red light to the second light source to reduce noise of the optical signal receiver. It will be appreciated that other peak wavelengths of light may be selected for the first light, such as green light, and that the corresponding first light source is selected as a green LED light source or an LD light source.
The present invention will be described in further detail with reference to specific examples. The following examples are merely illustrative of the present invention and should not be construed as limiting thereof.
Example 1
In the case of common lighting (bulb lamp or ceiling lamp, etc.), the visible light communication lighting source of the invention is applied as follows:
as shown in fig. 4a, the bulb lamp includes a lamp panel and an arc-shaped lampshade connected to the lamp panel, and the visible light communication illumination light source of the invention is arranged on the lamp panel. The visible light communication illumination source in fig. 4a is formed by combining a first light source and a second light source, and the first light source and the second light source are respectively driven by different electric signals. The first light source is a low-power blue light LED chip, and the second light source is a high-power illumination LED. It is to be understood that the number of the first light sources and the second light sources is not limited thereto, and for example, the visible light communication illumination light source of the present invention may be composed of two or more first and second light sources, respectively.
The first light source is a low-power blue light LED chip, and a high-speed communication signal is further loaded in the driving electric signal of the first light source to realize high-speed optical communication, and the peak wavelength of the emitted first light is between 430 and 480 nm; the second light source is a high-power LED, no communication signal is loaded, the specific composition is that fluorescent powder covers a high-power blue LED chip, the wavelength range of the emitted second light covers 430-700nm, the color temperature is lower than 4500k, and after the low-power blue light for communication is added, the color temperature is higher than 5000 k. In addition, the low-power LED chip of the first light source and the high-power LED chip of the second light source can also be arranged in the same LED, and a fluorescent powder layer is arranged above the two chips. The two chips are respectively driven by two paths of electric signals, the two chips emit blue light, then two beams of blue light irradiate the fluorescent powder layer, no fluorescent powder is contained in the fluorescent powder layer corresponding to the path of the blue light emitted by the first light source, and the blue light emitted by the low-power LED chip of the first light source directly transmits the fluorescent powder layer to be emitted.
In comparison, in the conventional technology of performing optical communication using only a single light source LED lamp: if the requirement of high-power illumination is to be met, similarly to the arrangement of the above embodiment 1, the LED chip of the single light source arranged on the lamp panel needs to have a sufficiently large area, however, the large-area LED chip will cause the junction capacitance to be larger and larger, the problem that the loaded high-speed electrical signal cannot be responded in time occurs, and high-speed optical communication cannot be realized.
In the embodiment, besides being used as an LED light source for high-power illumination, an LED light source with small power and small area is added, the two light sources are driven by different electric signals, and high-power illumination is realized after the first light and the second light are combined, and high-speed optical communication is realized through optical communication information contained in the first light.
In view of reducing the intensity of blue light with the same wavelength as the communication signal and improving the signal-to-noise ratio of the optical signal receiver, a filter for filtering blue light may be further added on the second light source.
The light rays of the two light sources reach the lampshade and are further scattered and emitted, and the emitted light rays reach the optical signal receiver after passing through the optical filter, so that optical communication is completed.
As a modification of embodiment 1, the low-power blue light source for optical communication is a blue laser, as shown in fig. 4 b. Because the divergence angle of the laser is not Lambert distributed, in order to be uniformly mixed with the light emitted by the high-power illumination LED, a scattering layer is added on the laser, so that the divergence angle of a blue laser beam is larger; the scattering layer may be silica gel and titanium oxide or other scattering particles, or may be a scattering film, and is not limited herein. Furthermore, the laser of the first light source and the blue light emitted by the high-power LED chip of the second light source pass through the fluorescent powder layer disposed on the LED chip of the second light source, and the laser path of the fluorescent powder layer corresponding to the laser emitted by the first light source does not contain fluorescent powder but contains scattering particles to scatter the transmitted laser. In addition, for the light source formed by exciting the fluorescent powder layer by the blue light LED chip, the first light source may be red light or green light, and the second light source may be the same light source formed by exciting the fluorescent powder layer by the blue light LED chip.
Example 2
In the common illumination occasions (panel lamps or strip lamps, etc.), the visible light communication illumination light source of the invention is applied as follows:
as shown in fig. 5a, the visible light communication illumination light source of the present invention is only disposed on a large-area lamp panel. It should be noted that the area of the panel lamp or the strip lamp is large, and the distance from the LED chip as the light source to the lamp shade is short, so that the light from the light source to the lamp shade is uniform, and the lighting light source is mostly arranged by a plurality of LED lattices.
In this embodiment 2, the second light source is a plurality of LEDs arranged in a lattice, and in order to make the communication light reach the lampshade uniformly as the illumination light, the first light source also needs to be arranged in a lattice, and the first light source may be an LED light source. The distribution is that a first light source is arranged beside each 1 second light source, and the plurality of first light sources are connected in series or connected in series and then connected in parallel. It is understood that one first light source may be disposed beside every 2 or more second light sources, and is not limited herein. The plurality of first light sources and the plurality of second light sources are respectively driven by two paths of electric signals, and the wavelength range combination of the first light and the second light emitted by the first light sources and the second light sources can be the same as or different from that of embodiment 1, and is not described herein again.
As a modification of embodiment 2, as shown in fig. 5b, the light emitted from the first light source may be made uniform by scattering the light guide bar. The method specifically comprises the following steps: the light emitted by a first light source is coupled into the scattering light guide strip, the scattering light guide strip is folded and arranged beside the second light source in a lattice arrangement in an inserting way, and the scattering light guide strip is provided with scattering light, for example, the scattering light guide strip can be a light leakage groove cut on a scattering optical fiber or a common light guide fiber and used as the scattering light guide strip, and can also be a plastic square scattering light guide strip. Therefore, the first light emitted by the first light source is transmitted and scattered in the scattering light guide strip, and finally is uniformly mixed with the second light emitted by the second light source at the lampshade.
Example 3
The invention relates to a visible light communication lighting source which is directed to the lower part of a lighting lamp (a flashlight, a car lamp, a spot lamp and the like), and the application of the visible light communication lighting source comprises the following steps:
as shown in fig. 6, the directional lighting fixture includes a visible light communication lighting source formed by combining a high-power second light source and a low-power first light source, and the first light source and the second light source are respectively driven by two paths of electric signals; also included are optical elements that collect light. The optical element changes lambertian divergent light emitted from the visible light communication illumination light source into a light beam of a small angle (0 to 60 degrees) so as to irradiate the light beam to a specified position or a longer distance.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A visible light communication illumination source, comprising:
the light source comprises a first light source and a second light source, wherein the first light source and the second light source respectively emit first light and second light, the wavelength ranges of the first light and the second light are both in the visible light range, and the first light and the second light are mixed to form white light; the first light source and the second light source are respectively driven by different electric signals, and communication modulation signals are loaded on the electric signals for driving the first light source and are used for optical communication; the luminous flux of the first light source is smaller than that of the second light source.
2. The visible light communication lighting source of claim 1, wherein the first light source is an LED light source or a laser light source.
3. The visible light communication illumination light source according to claim 1, wherein the first light source is a laser light source, and a scattering layer is disposed on a path of the first light emitted from the first light source.
4. The visible light communication illumination light source as claimed in any one of claims 1 to 3, wherein the first light is blue light with a peak wavelength between 430 and 480nm, and the wavelength range of the second light covers 480 and 700 nm.
5. The visible light communication illumination light source as claimed in claim 4, wherein the second light source is an LED light source, or the second light source is a light source formed by exciting a phosphor with a blue LED.
6. The visible light communication lighting source as claimed in any one of claims 1 to 3, wherein the first light is red light with a peak wavelength between 600 and 700nm, and the wavelength range of the second light covers 430 and 700 nm.
7. The visible light communication illumination light source according to claim 1 or 2, wherein the second light source is formed by exciting a phosphor layer by a blue LED, and the phosphor layer is disposed on a light path of the first light emitted by the first light source.
8. The visible light communication lighting source of claim 1, wherein the number of the second light sources is plural, the plural second light sources are arranged in a regular lattice, and the plural first light sources are distributed among the plural second light sources arranged in a regular lattice.
9. The visible light communication lighting source of claim 1, wherein the number of the second light sources is plural, and the plural second light sources are arranged in a regular lattice;
the light source module also comprises a scattering light guide strip which is arranged at the periphery of the plurality of second light sources; the light emitted by the first light source is coupled into the scattering light guide bar, and the light is transmitted and scattered in the scattering light guide bar.
10. A visible light communication system, comprising:
the visible light communication illumination source of any one of claims 1 to 9,
and the optical signal receiver is provided with an optical filter which blocks at least part of the second light and transmits the first light.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010808730.XA CN114079507A (en) | 2020-08-12 | 2020-08-12 | Visible light communication lighting source |
| PCT/CN2021/105902 WO2022033257A1 (en) | 2020-08-12 | 2021-07-13 | Visible light communication lighting source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010808730.XA CN114079507A (en) | 2020-08-12 | 2020-08-12 | Visible light communication lighting source |
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| CN114079507A true CN114079507A (en) | 2022-02-22 |
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| WO (1) | WO2022033257A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8125137B2 (en) * | 2005-01-10 | 2012-02-28 | Cree, Inc. | Multi-chip light emitting device lamps for providing high-CRI warm white light and light fixtures including the same |
| CN104580051A (en) * | 2013-10-12 | 2015-04-29 | 上海宽带技术及应用工程研究中心 | Visible light uplink and downlink communication method and system |
| JP2016213140A (en) * | 2015-05-13 | 2016-12-15 | パナソニックＩｐマネジメント株式会社 | Lighting system |
| CN106301561A (en) * | 2015-06-28 | 2017-01-04 | 钟镇 | A kind of wireless light communication device based on illumination LED and control method thereof |
| KR102419890B1 (en) * | 2015-11-05 | 2022-07-13 | 삼성전자주식회사 | Light emitting apparatus and method of manufacturing the same |
| CN207778054U (en) * | 2017-12-29 | 2018-08-28 | 惠州伟志电子有限公司 | A kind of LED lamp with visible light communication function |
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