CN110600527B - Display panel and manufacturing method thereof, visible light communication equipment and communication method - Google Patents
Display panel and manufacturing method thereof, visible light communication equipment and communication method Download PDFInfo
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- CN110600527B CN110600527B CN201910939374.2A CN201910939374A CN110600527B CN 110600527 B CN110600527 B CN 110600527B CN 201910939374 A CN201910939374 A CN 201910939374A CN 110600527 B CN110600527 B CN 110600527B
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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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- 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
- H04B10/40—Transceivers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/1201—Manufacture or treatment
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
Abstract
The invention discloses an electroluminescent diode display panel and a manufacturing method thereof, visible light communication equipment and a communication method, wherein the electroluminescent diode display panel comprises the following components: the device comprises a substrate, a transmitting unit and a receiving unit, wherein the transmitting unit and the receiving unit are arranged on the substrate, and the transmitting unit comprises an electroluminescent diode and is used for responding to a modulation signal to transmit a visible light signal in a first wavelength range carrying coded information; the receiving unit comprises a photosensitive element and is used for converting the received visible light signal into an electric signal. The embodiment provided by the invention can realize full-duplex visible light optical communication through the transmitting unit and the receiving unit, and has wide application prospect.
Description
Technical Field
The invention relates to the technical field of display, in particular to an electroluminescent diode display panel, a manufacturing method of the electroluminescent diode display panel, visible light communication equipment and a communication method.
Background
With the rapid development of wireless transmission requirements, wireless spectrum resources are increasingly strained, and in the future, wireless communication is expected to seek new available spectrum resources while introducing more wireless transmission technologies, and under such a background, a Visible Light Communication (VLC) technology is produced, where the VLC refers to emitting a high-speed bright-dark flashing optical signal that cannot be sensed by human eyes as an information carrier by using the characteristic of high response speed of a light emitting diode while meeting lighting requirements, allowing the optical signal carrying information to pass through transmission media such as air and water, and finally receiving the optical signal by using a photoelectric converter and recovering the transmitted information.
However, the visible light communication devices in the prior art are generally divided into a transmitting terminal and a receiving terminal, and full-duplex visible light communication cannot be realized.
Disclosure of Invention
In order to solve at least one of the above problems, a first aspect of the present invention provides an electroluminescent diode display panel comprising
A substrate;
a transmitting unit and a receiving unit disposed on the substrate, wherein
The transmitting unit comprises an electroluminescent diode and is used for responding to a modulation signal to transmit a visible light signal in a first wavelength range carrying coded information;
the receiving unit comprises a photosensitive element and is used for converting the received visible light signal into an electric signal.
Further, the receiving unit further comprises
The filtering unit is used for filtering out the visible light signals in the first wavelength range carrying the coded information in the received visible light signals, so that the photosensitive element receives the visible light signals outside the first wavelength range.
Further, the optical filtering unit is of a photonic crystal structure and comprises a first refractive index medium and a second refractive index medium which are arranged periodically;
or
The light filtering unit is of a photonic crystal structure, and the photonic crystal structure comprises a first electrode, a second electrode, and electro-optical elements and a third refractive index medium which are arranged between the first electrode and the second electrode in a periodic mode.
Further, in the case where the filter unit includes first and second refractive media that are periodically arranged, one of the first and second refractive media is air;
or alternatively
In the case where the filter unit includes a first electrode, a second electrode, and a periodically arranged electro-optical element and a third refractive medium between the first electrode and the second electrode, the third refractive medium is air.
Further, the emission unit further includes a thin film transistor disposed on the substrate to drive the electroluminescent diode; wherein
The photosensitive element is arranged on one side of the thin film transistor, which is far away from the substrate, and the orthographic projection of the photosensitive element on the substrate covers the orthographic projection of the thin film transistor on the substrate;
the electroluminescent diode is arranged on the side face of the photosensitive element and emits light towards the direction far away from the substrate.
Further, the emission unit further includes a thin film transistor disposed on the substrate to drive the electroluminescent diode; wherein
The photosensitive element is arranged on one side of the thin film transistor, which is far away from the substrate, and the projection of the photosensitive element and the thin film transistor is overlapped;
the electroluminescent diode is arranged on the side face of the photosensitive element and emits light towards the direction far away from the substrate;
the light filtering unit is arranged on one side of the photosensitive element far away from the substrate and between the photosensitive element and the light emitting diode.
Further, the display panel further includes an electromagnetic shielding layer between the thin film transistor and the photosensitive element.
Further, the photosensitive element includes a third electrode, a fourth electrode, and a photodiode between the third electrode and the fourth electrode.
Further, the photodiode is a group IV semiconductor-based photodiode or an organic photodiode.
A second aspect of the invention provides a visible light communication device comprising
Signal transmitting circuit, signal receiving circuit, and display panel according to the first aspect, wherein
The signal transmitting circuit is used for modulating a received baseband signal to generate the modulation signal;
the signal receiving circuit is configured to demodulate the electrical signal to generate a demodulated signal.
A third aspect of the present invention provides a method for fabricating an electroluminescent diode display panel, comprising
Forming a thin film transistor on a substrate;
forming a photosensitive element on one side of the thin film transistor, which is far away from the substrate, wherein the orthographic projection of the photosensitive element on the substrate covers the orthographic projection of the thin film transistor on the substrate, and the photosensitive element is used for converting the received visible light signal into an electric signal;
and forming an electroluminescent diode on the side surface of the photosensitive element, and responding to a modulation signal to emit a visible light signal in a first wavelength range carrying coded information under the driving of the thin film transistor.
Further, also comprises
And a filtering unit is formed on one side of the photosensitive element far away from the substrate and between the photosensitive element and the light emitting diode and is used for filtering out the visible light signals in the first wavelength range carrying the coded information in the received visible light signals so as to enable the photosensitive element to receive the visible light signals outside the first wavelength range.
A fourth aspect of the present invention provides a communication method for performing communication using the visible light communication apparatus according to the second aspect, including:
the signal transmitting circuit modulates the received baseband signal to generate a modulation signal, so that the display panel responds to the modulation signal to transmit a visible light signal of a first wavelength range carrying coded information;
the display panel converts the received visible light signal into an electrical signal, and the signal receiving circuit demodulates the electrical signal to generate a demodulated signal.
The invention has the following beneficial effects:
aiming at the existing problems, the invention provides an electroluminescent diode display panel and a manufacturing method thereof, visible light communication equipment and a communication method, and full-duplex visible light optical communication can be realized through an emitting unit and a receiving unit which are arranged; particularly, the filtering unit included in the receiving unit can filter the visible light signal in the first wavelength range transmitted by the transmitting unit, so that the interference of the light wave transmitted by the transmitting unit to the receiving unit is effectively avoided, the communication efficiency of the visible light communication equipment is further improved, and the wide application prospect is achieved.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 2 shows a schematic structural diagram of a photonic crystal according to an embodiment of the present invention;
FIG. 3 shows a schematic structural diagram of a photonic crystal according to another embodiment of the present invention;
FIG. 4 is a flow chart of a method for fabricating a display panel according to an embodiment of the invention;
fig. 5 shows a block diagram of a visible light communication device according to an embodiment of the present invention;
fig. 6 is a block diagram showing a configuration of a signal transmission circuit according to an embodiment of the present invention;
fig. 7 is a block diagram showing a configuration of a signal receiving circuit according to an embodiment of the present invention;
fig. 8 shows a flowchart of a communication method of the visible light communication device according to an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
As shown in fig. 1, an embodiment of the present invention provides an electroluminescent diode display panel including a substrate 10; a transmitting unit and a receiving unit 17 arranged on the substrate 10, wherein the transmitting unit comprises an electroluminescent diode 18 for transmitting a visible light signal of a first wavelength range carrying encoded information in response to a modulation signal; the receiving unit 17 includes a photosensitive element for converting the received visible light signal into an electrical signal.
In this embodiment, the emitting unit includes an electroluminescent diode 18 and a thin film transistor 11 for driving the electroluminescent diode, the electroluminescent diode 18 is a light source, i.e., a signal source in optical communication, and has functions of illumination and display, and in response to an input modulation signal, emits a visible light signal in a first wavelength range carrying encoded information, thereby implementing emission of the visible light signal in visible light communication; in consideration of the use efficiency of visible light signals, the light emitting direction of the emitting unit is a direction away from the substrate.
Meanwhile, the receiving unit 17 includes a photosensitive element, as shown in fig. 1, the photosensitive element is disposed on a side of the thin film transistor away from the substrate, and an orthographic projection of the photosensitive element on the substrate covers an orthographic projection of the thin film transistor on the substrate. Meanwhile, in consideration of the fact that the photosensitive element can better sense visible light signals, the photosensitive element is located on one side of the electroluminescent diode, specifically, the orthographic projection of the photosensitive element on the substrate is not overlapped with the orthographic projection of the electroluminescent diode on the substrate, and the photosensitive element senses the received visible light signals, converts the visible light signals into electric signals and outputs the electric signals to other equipment for signal processing.
The embodiment can simultaneously realize the sending and receiving of visible light signals through the electroluminescent diode and the photosensitive element, thereby realizing full-duplex visible light communication.
Considering that the visible light signal of the first wavelength range carrying the encoded information transmitted by the transmitting unit may interfere with the visible light signal received by the receiving unit, in an alternative embodiment, as shown in fig. 1, the receiving unit further includes a filtering unit 175 for filtering out the visible light signal of the first wavelength range carrying the encoded information in the received visible light signal, so that the photosensitive element receives the visible light signal outside the first wavelength range.
In this embodiment, on the basis of the foregoing display panel, the filtering unit 175 disposed on the receiving unit can filter the visible light signal in the first wavelength range emitted by the emitting unit, so as to effectively avoid the visible light signal in the first wavelength range emitted by the emitting unit from interfering with the receiving unit, so as to ensure the accuracy and stability of the visible light signal received by the receiving unit, for example, ensure that the receiving unit can receive the visible light signal in the second wavelength range carrying the encoded information.
The filtering unit is a filtering device capable of filtering out a specific wavelength range, such as a filter, a light filter, etc. In this embodiment, as shown in fig. 1, the filtering unit 175 is a photonic crystal and is located on a side of the photosensitive element far from the substrate 10 and between the photosensitive element and the light emitting diode, so as to filter the visible light signal received by the photosensitive element. The photonic crystal is an optical microstructure material with periodically changed dielectric constant, and is mainly characterized by having an optical forbidden band, namely the pass resistance control of specific wavelength can be realized by selecting proper structure and parameters.
In this embodiment, the visible light signal in the first wavelength range carrying encoded information and sent by the transmitting unit is filtered by the photonic crystal, so that the visible light signal transmitted during communication is prevented from interfering with the visible light signal received by the photosensitive element, thereby reducing interference noise and improving the stability of the communication system.
In an alternative embodiment, as shown in FIG. 2, the photonic crystal includes a periodic arrangement of first and second refractive index media.
In this embodiment, the photonic crystal 175 includes a substrate 1751, and a periodic arrangement of first and second refractive index media 1752, 1753 disposed on the substrate 1751. The first refractive index medium 1752 and the second refractive index medium 1753 are media with fixed refractive indexes, the forbidden bandwidth of the photonic crystal is fixed, namely, visible light signals with specific wavelengths can be blocked, when the wavelength of the visible light signals emitted by the emitting unit is fixed, the visible light signals emitted by the emitting unit can be filtered by selecting the proper first refractive index medium 1752 and the proper second refractive index medium 1753, so that the interference of the visible light signals emitted by the emitting unit to the receiving unit in the communication process is avoided, and the noise interference is effectively reduced.
In view of simplifying the manufacturing steps of the display panel, in an alternative embodiment, one of the first refractive index medium and the second refractive index medium uses an insulating layer medium material between the photosensitive element and the electroluminescent diode to share the manufacturing steps of the display panel. In order to further simplify the manufacturing steps, in an optional embodiment, the other of the first refractive index medium and the second refractive index medium is air, that is, the photonic crystal is manufactured by punching holes in an insulating layer medium material, that is, one of the first refractive index medium and the second refractive index medium is the insulating layer medium material, and the other is air, so that a complex process for manufacturing the photonic crystal in a semiconductor growth mode and consideration on the quality of a growth interface of the two refractive index media in a manufacturing process are avoided, the stability of the display panel can be improved, and the manufacturing cost of the display panel is effectively reduced.
In another alternative embodiment, as shown in FIG. 3, the photonic crystal structure includes a first electrode, a second electrode, and a periodic arrangement of electro-optical elements and a third refractive index medium between the first and second electrodes, taking into account the possible need to filter out visible light signals of different wavelength ranges.
In this embodiment, the photonic crystal 175 includes a first electrode 1754, a second electrode 1755, and an electro-optical element 1756 and a third medium 1757 of refractive index between the first electrode 1754 and the second electrode 1755, wherein the third medium 1757 of refractive index is a medium with a fixed refractive index; when the electrode voltages of the first electrode 1754 and the second electrode 1755 loaded on the electro-optical element 1756 are changed, the refractive index of the electro-optical element 1756 is changed correspondingly; that is, the forbidden bandwidth of the photonic crystal 175 is variable, and the forbidden bandwidth of the photonic crystal can be adjusted according to the wavelength range of the visible light signal emitted by the emission unit, which is suitable for the case where the wavelength of the visible light signal emitted by the emission unit is not fixed. In other words, the photonic crystal with the adjustable forbidden band width of the present embodiment can filter out visible light in different wavelength ranges.
In view of simplifying the manufacturing steps of the display panel, in an optional embodiment, the third refractive index medium is air, that is, the photonic crystal is manufactured by punching holes on the electro-optical element, so that a complex process for manufacturing the photonic crystal in a semiconductor growth mode in the manufacturing process is avoided, the quality of a growth interface of the two media is considered, the stability of the display panel is improved, and the manufacturing cost of the display panel is effectively reduced.
In order to accurately transmit and receive visible light signals, in an alternative embodiment, as shown in fig. 1, the photosensitive element is located on a side of the thin film transistor 11 away from the substrate 10, and includes a third electrode 171, a fourth electrode 173, and a photodiode 172 located between the third electrode 171 and the fourth electrode 173.
In this embodiment, the receiving unit is located at a side of the electroluminescent diode, the photodiode 172 of the photosensitive element of the receiving unit senses a visible light signal and generates a carrier, and the visible light signal is converted into an electrical signal and transmitted to other devices for signal processing by performing a directional movement under an electric field generated by an electrode voltage applied to the third electrode 171 and the fourth electrode 173 to generate a photo-generated current. The photodiode 172 is a PIN photodiode, and may be a photodiode including a group IV element semiconductor base, or an Organic Photodiode (OPD), and the organic photodiode has advantages of being light, thin, flexible, easy to integrate, and environmentally friendly.
In this embodiment, the photosensitive element is located on a side of the thin film transistor away from the substrate, and an orthogonal projection of the photosensitive element on the substrate covers an orthogonal projection of the thin film transistor on the substrate, and since the photodiode has a characteristic of absorbing a large number of photons, and the third electrode and the fourth electrode are both made of electrode metal materials, the influence of light on the characteristic of the thin film transistor can be effectively prevented.
To further reduce the influence of illumination on the characteristics of the thin film transistor, in another alternative embodiment, as shown in fig. 1, the display panel further comprises an electromagnetic shielding layer 14 between the thin film transistor 11 and the photosensitive element.
In this embodiment, as shown in fig. 1, the electromagnetic shielding layer 14 is located between the thin film transistor 11 and the light sensitive element, and can effectively prevent the photodiode of the light sensitive element from electromagnetic interference to the thin film transistor, when the electromagnetic wave reaches the surface of the shielding layer 14 far from the substrate side, the discontinuity of impedance at the interface between the third interlayer insulating layer 15 and the shielding layer 14 reflects the incident electromagnetic wave, the energy that continues to propagate is absorbed in the shielding layer 14, and when the electromagnetic wave reaches the surface of the shielding layer 14 near the substrate side, the discontinuity of the interface between the shielding layer 14 and the first planarizing layer 12 reflects again, so as to avoid the electromagnetic interference to the thin film transistor by the photodiode.
In a specific example, as shown in fig. 1, the display panel includes:
a substrate 10.
A thin film transistor 11 of an emission unit formed on a substrate, the thin film transistor 11 including a gate electrode 111, a gate insulating layer 112 covering the gate electrode 111, an active layer 113 formed on the gate insulating layer 112, and a source electrode 114 and a drain electrode 115 formed on the active layer 113.
A first planarizing layer 12 formed on the thin film transistor.
A first interlayer insulating material layer formed on the first planarizing layer, a first interlayer insulating layer 13 formed by patterning the first interlayer insulating material layer, the first interlayer insulating layer 13 defining the locations of the photosensitive elements and the electroluminescent diodes. It should be noted that, in this embodiment, in order to reduce the interference of the visible light signal emitted by the emitting unit to the photosensitive element, the inner filtering unit further includes a photonic crystal disposed between the photosensitive element and the electroluminescent diode; in order to simplify the manufacturing steps, in this embodiment, a first refractive index medium of a photonic crystal located between the photosensor and the electroluminescent diode is manufactured using a portion of the first interlayer insulating layer, and then a second refractive index medium of the photonic crystal is formed by punching holes on the first refractive index medium as the photonic crystal, the second refractive index medium being air, and the photonic crystal having a structure in which the first refractive index medium and the second refractive index medium are periodically arranged is formed, thereby achieving filtering of visible light signals of the first wavelength range emitted by the emission unit in the lateral direction.
In the area of the receiving unit to be formed, further comprising:
an electromagnetic shielding layer 14 formed on the first planarization layer in a region of the receiving unit to be formed, an orthogonal projection of the electromagnetic shielding layer 14 on the substrate 10 covering an orthogonal projection of the thin film transistor 11 on the substrate 10.
And a third interlayer insulating layer 15 formed on the electromagnetic shielding layer.
A light sensing element formed on the third interlayer insulating layer 15 in a region of the receiving unit to be formed, the light sensing element including a third electrode 171, a photodiode 172, and a fourth electrode 173.
In the region of the electroluminescent diode to be formed, further comprising:
an electroluminescent diode 18 formed on the first planarization layer, the electroluminescent diode 18 including an anode 181, an electron injection layer 182, an electroluminescent layer 183, a hole injection layer 184, and a cathode 185 formed in this order, the anode 181 being electrically connected to a source or a drain of the driving transistor 11 through a via hole penetrating the first planarization layer 12.
A second planarization layer 16 is formed to cover the fourth electrode 173 and the cathode 185.
A first connection metal 174 and a second connection metal 186 formed on the second planarization layer, the first connection metal 174 being electrically connected to the fourth electrode 173 of the photosensor through a via hole penetrating the second planarization layer 16, and the second connection metal 186 being electrically connected to the cathode 185 of the electroluminescent diode through a via hole penetrating the second planarization layer 16.
A second interlayer insulating layer 19 is formed covering the second planarization layer 16, the first connection metal 174, and the second connection metal 186, the first connection metal 174 and the second connection metal 186 being insulated from each other.
A photonic crystal formed on the second interlayer insulating layer 19, an orthographic projection of the photonic crystal on the substrate covering an orthographic projection of the photosensitive element on the substrate to enable filtering of the visible light signal of the first wavelength range emitted by the emission unit in a direction towards the substrate. In this embodiment, the photonic crystal covering the photosensor and the photonic crystal located between the photosensor and the electroluminescent diode act together, so that the photosensor receives visible light signals outside the first wavelength range, interference of the visible light signals emitted by the emitting unit to the receiving unit in the communication process is avoided, and noise interference is effectively reduced.
Corresponding to the display panel provided in the foregoing embodiments, an embodiment of the present application further provides a manufacturing method of an electroluminescent diode display panel, and since the manufacturing method provided in the embodiments of the present application corresponds to the display panel provided in the foregoing several embodiments, the foregoing embodiment is also applicable to the manufacturing method provided in the present embodiment, and detailed description is not given in this embodiment.
As shown in fig. 4, an embodiment of the present application further provides a method for manufacturing an electroluminescent diode display panel, including: forming a thin film transistor on a substrate; forming a photosensitive element on one side of the thin film transistor far away from the substrate, wherein the orthographic projection of the photosensitive element on the substrate covers the orthographic projection of the thin film transistor on the substrate, and the photosensitive element is used for converting the received visible light signal into an electric signal; and forming an electroluminescent diode on the side surface of the photosensitive element, and responding to a modulation signal to emit a visible light signal in a first wavelength range carrying coded information under the driving of the thin film transistor.
In an optional embodiment, the manufacturing method further includes forming a filtering unit between the photosensitive element and the electroluminescent diode, and on a side of the photosensitive element away from the substrate, for filtering out a visible light signal in a first wavelength range carrying encoded information in the received visible light signal, so that the photosensitive element receives a visible light signal outside the first wavelength range.
Based on the display panel, as shown in fig. 5, an embodiment of the present application further provides a visible light communication device, including a signal transmitting circuit, a signal receiving circuit, and the display panel, where the signal transmitting circuit is configured to modulate a received baseband signal to generate the modulated signal; the signal receiving circuit is used for demodulating the electric signal to generate a demodulation signal.
In the embodiment, the signal sending circuit generates a modulation signal according to the received baseband signal, transmits the modulation signal to the display panel, and drives the electroluminescent diode of the emitting unit of the display panel to emit light so as to realize signal emission of visible light communication; meanwhile, the photosensitive element of the display panel senses the visible light signal and converts the visible light signal into an electric signal which is transmitted to the signal receiving circuit to demodulate the signal and generate a demodulated signal.
In a specific example, as shown in fig. 6, the signal transmitting circuit includes a channel encoder, a signal modulator, and a driving circuit, the channel encoder encodes an input baseband signal, modulates the baseband signal to a carrier wave through the signal modulator to form a modulation signal, and transmits the modulation signal to the driving circuit, the driving circuit drives the electroluminescent diode of the display panel to emit light according to the modulation signal, and the electroluminescent diode emits a visible light signal in a first wavelength range carrying encoded information. As shown in fig. 7, the signal receiving circuit includes a signal demodulator and a channel decoder, and the signal demodulator receives and demodulates the electrical signal output from the photosensitive element and generates a demodulated signal through the channel decoder. The visible light communication device can simultaneously transmit and receive visible light signals, namely, the visible light communication device can realize full-duplex visible light communication.
Corresponding to the visible light communication device provided in the foregoing embodiments, an embodiment of the present application further provides a communication method for performing communication by using the visible light communication device, and since the communication method provided in the embodiment of the present application corresponds to the visible light communication device provided in the foregoing several embodiments, the foregoing embodiment is also applicable to the use method provided in this embodiment, and detailed description is not given in this embodiment.
As shown in fig. 8, an embodiment of the present application further provides a communication method for performing communication by using the above visible light communication apparatus, including: the signal transmitting circuit modulates the received baseband signal to generate a modulation signal, so that the display panel responds to the modulation signal to transmit a visible light signal of a first wavelength range carrying coded information; the display panel converts the received visible light signal into an electrical signal, and the signal receiving circuit demodulates the electrical signal to generate a demodulated signal.
Aiming at the existing problems, the invention provides an electroluminescent diode display panel and a manufacturing method thereof, visible light communication equipment and a communication method, and full-duplex visible light optical communication can be realized through an emitting unit and a receiving unit which are arranged; especially, the filtering unit included in the receiving unit can filter the visible light signal in the first wavelength range transmitted by the transmitting unit, so that the interference of the light wave transmitted by the transmitting unit to the receiving unit is effectively avoided, the communication efficiency of the visible light communication equipment is further improved, and the receiving unit has a wide application prospect.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (11)
1. An electroluminescent diode display panel, comprising
A substrate;
a transmitting unit and a receiving unit disposed on the substrate, wherein
The transmitting unit comprises an electroluminescent diode and is used for responding to a modulation signal to transmit a visible light signal in a first wavelength range carrying coded information;
the receiving unit comprises a photosensitive element and is used for converting the received visible light signal into an electric signal;
the receiving unit further includes:
the filtering unit is used for filtering visible light signals in a first wavelength range carrying coded information in the received visible light signals so as to enable the photosensitive element to receive the visible light signals outside the first wavelength range;
the light filtering unit is of a photonic crystal structure and comprises a first refractive index medium and a second refractive index medium which are arranged periodically.
2. The display panel according to claim 1,
the light filtering unit is of a photonic crystal structure, and the photonic crystal structure comprises a first electrode, a second electrode, and a third refractive index medium and periodically arranged electro-optical elements which are positioned between the first electrode and the second electrode.
3. The display panel according to claim 2,
in the case where the filter unit includes first and second refractive index media that are periodically arranged, one of the first and second refractive index media is air;
or
In the case where the filter unit includes a first electrode, a second electrode, and a periodically arranged electro-optical element and a third refractive medium between the first electrode and the second electrode, the third refractive medium is air.
4. The display panel according to claim 1,
the emitting unit further comprises a thin film transistor disposed on the substrate to drive the electroluminescent diode; wherein
The photosensitive element is arranged on one side of the thin film transistor, which is far away from the substrate, and the orthographic projection of the photosensitive element on the substrate covers the orthographic projection of the thin film transistor on the substrate;
the electroluminescent diode is arranged on the side face of the photosensitive element and emits light towards the direction far away from the substrate.
5. The display panel according to claim 2,
the emitting unit further comprises a thin film transistor disposed on the substrate to drive the electroluminescent diode; wherein
The photosensitive element is arranged on one side of the thin film transistor, which is far away from the substrate, and the projection of the photosensitive element and the thin film transistor is overlapped;
the electroluminescent diode is arranged on the side surface of the photosensitive element and emits light towards the direction far away from the substrate;
the light filtering unit is arranged on one side of the photosensitive element far away from the substrate and between the photosensitive element and the light emitting diode.
6. The display panel according to claim 5,
the display panel further includes an electromagnetic shielding layer between the thin film transistor and the photosensitive element.
7. The display panel according to any one of claims 1 to 6,
the photosensor includes a third electrode, a fourth electrode, and a photodiode between the third electrode and the fourth electrode.
8. The display panel according to claim 7,
the photodiode is a group IV element semiconductor-based photodiode or an organic photodiode.
9. A visible light communication apparatus, comprising
Signal transmission circuit, signal reception circuit, and display panel according to any one of claims 1 to 8, wherein
The signal transmitting circuit is used for modulating a received baseband signal to generate the modulation signal;
the signal receiving circuit is used for demodulating the electric signal to generate a demodulation signal.
10. A method of making an electroluminescent diode display panel as claimed in any one of claims 1 to 8, comprising
Forming a thin film transistor on a substrate;
forming a photosensitive element on one side of the thin film transistor, which is far away from the substrate, wherein the orthographic projection of the photosensitive element on the substrate covers the orthographic projection of the thin film transistor on the substrate, and the photosensitive element is used for converting the received visible light signal into an electric signal;
forming an electroluminescent diode on the side face of the photosensitive element, and responding to a modulation signal to emit a visible light signal in a first wavelength range carrying coded information under the drive of the thin film transistor;
and a filtering unit is formed on one side of the photosensitive element far away from the substrate and between the photosensitive element and the electroluminescent diode and is used for filtering out the visible light signal in the first wavelength range carrying the coded information in the received visible light signal so as to enable the photosensitive element to receive the visible light signal outside the first wavelength range.
11. A communication method for communicating using the visible light communication apparatus according to claim 9, comprising:
the signal transmitting circuit modulates the received baseband signal to generate a modulation signal, so that the display panel responds to the modulation signal to transmit a visible light signal of a first wavelength range carrying coded information;
the display panel converts the received visible light signal into an electrical signal, and the signal receiving circuit demodulates the electrical signal to generate a demodulated signal.
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| CN108964762A (en) * | 2018-07-23 | 2018-12-07 | 京东方科技集团股份有限公司 | Visible light communication device and its driving method, door lock and visible light communication method |
| CN109801937A (en) * | 2019-01-28 | 2019-05-24 | 京东方科技集团股份有限公司 | Visible light communication device and preparation method thereof, visible light communication system |
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| CN108964762A (en) * | 2018-07-23 | 2018-12-07 | 京东方科技集团股份有限公司 | Visible light communication device and its driving method, door lock and visible light communication method |
| CN109801937A (en) * | 2019-01-28 | 2019-05-24 | 京东方科技集团股份有限公司 | Visible light communication device and preparation method thereof, visible light communication system |
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