Visible light communication mobile phone

Abstract

The invention relates to a visible light communication mobile phone, and the mobile phone comprises an optical signal receiving module which receives a visible light communication signal in a space, and comprises a PD receiver and an optical signal processing and amplifying circuit; the optical signal transmitting module is used for transmitting an optical signal to a space and comprises a transmitting LED module and a high-speed driving circuit; the man-machine interaction module is responsible for interaction between a user and a mobile phone and comprises an LCD touch screen and an audio processing circuit; the central processing unit is a core component of the mobile phone and is responsible for executing calculation, processing data and controlling a system; the power supply module supplies power to each circuit module of the mobile phone and comprises a lithium battery, a control switch and a power supply management unit; and the appearance structural member is used for protecting the internal components and providing a necessary interaction interface for a user. The beneficial effects of the invention are that the system is based on the wireless optical frequency communication technology, is suitable for various environments, is high in confidentiality, and is low in construction cost.

Description

Technical Field

[0001] The invention relates to a visible light communication mobile phone, belonging to the technical field of visible light communication. Background Art

[0002] Radio communication and its application are the most active application and research fields of information technology today. However, most radio communication technologies are limited by the influence of transmission power and electromagnetic interference, and cannot be used in coal mine safety production, medical monitoring, special occasions of marine exploration, underground, mining areas and other electromagnetic sensitive areas. Visible light communication has low interference, high security, energy saving and environmental protection, and the implementation and maintenance of the system are also relatively convenient. It is a communication technology that has emerged in recent years. Based on LED lighting base station lamps with visible light communication function and mobile phones with visible light communication in this project, a communication network is formed to quickly build a safe information space. Realize text and voice communication at the VLC system lighting anytime and anywhere. Summary of the invention

[0003] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a visible light communication mobile phone, which utilizes visible light wireless communication technology to build a communication network to realize the transmission of text and voice information.

[0004] The present invention is implemented by the following technical solution: A visible light communication mobile phone, comprising: Optical signal receiving module: receiving visible light communication signals in space, including: PD receiver, optical signal processing and amplification circuit; Optical signal sending module: transmits optical signals into space, including: transmitting LED module and high-speed driving circuit; Human-computer interaction module: responsible for the interaction between the user and the mobile phone, including: LCD touch screen, audio processing circuit; CPU: The core component of a phone, responsible for performing calculations, processing data and controlling the system; Power module: provides power for various circuit modules of the mobile phone, including lithium battery, control switch, and power management unit; Appearance structural parts: protect internal components and provide users with necessary interactive interfaces.

[0005] The PD receiver converts the received optical signal into a weak current signal, which is connected to the central processing unit through a transimpedance amplifier, a differential amplifier, a digitally controlled variable gain amplifier, and a differential-to-single-ended amplifier in sequence. The central processing unit transmits the digital signal through a high-speed drive circuit, a filter circuit, and a transmitting LED module. The central processing unit is connected to a microphone, a speaker, and an earphone through an audio processing circuit; the central processing unit is connected to an LCD touch screen, and the LCD touch screen is controlled by an LCD screen drive circuit at the same time; the central processing unit is connected to a memory; and a lithium battery supplies power to various circuit modules of the mobile phone through a power management unit.

[0006] The transmitting LED module adopts infrared lamp beads, and the receiving lamp filters out the visible light band through a narrow-band filter. The high-speed driving circuit controls the high-speed switching of the infrared lamp beads to quickly send text messages or voice messages to the optical communication space for information transmission.

[0007] The emitting LED module adopts three infrared lamp beads with a wavelength of 850nm, and the visible light band is 360nm-780nm.

[0008] The human-computer interaction module collects the text or voice messages to be sent and transmits them to the central processing unit after encoding; the central processing unit decodes the encoding and generates a high-speed drive circuit control signal to control the light on and off of the transmitting LED module.

[0009] The PD receiver receives the downlink optical signal emitted by the visible light communication lamp and converts the optical signal into a weak current signal; the current signal passes through a transimpedance amplifier to convert the weak current signal into a voltage signal; the voltage signal is amplified by a differential amplifier and the single-ended voltage signal is converted into a differential voltage signal; the differential voltage signal is further amplified by a digitally controlled variable gain amplifier, and the digitally controlled variable gain amplifier determines the signal strength and dynamically amplifies the signal so that the signal can reach the normal acquisition judgment threshold; the further amplified differential voltage signal is converted into a single-ended voltage signal by a differential-to-single-ended amplifier and the common-mode interference in the differential signal is filtered out; the input optical signal is converted into a recognizable voltage signal after the above processing and transmitted to the central processing unit for decoding and modulation; the central processing unit converts the demodulated information into text or voice text messages through the human-computer interaction unit; and the information reception is completed.

[0010] The lithium battery is connected to the mobile phone mainboard through a toggle switch, the toggle switch is embedded in the power switch mounting hole of the mobile phone rear shell, a single-pole double-throw toggle switch is selected, when the toggle switch is in the first gear, the mobile phone is connected to an external charger to charge the lithium battery; when the toggle switch is in the second gear, the lithium battery supplies power to various circuit modules of the mobile phone, and the mobile phone button cap is glued and fixed to the lower cover of the mobile phone and the standby button detection circuit of the mainboard to form a standby button to enter or exit the standby mode by pressing the button.

[0011] The upper cover of the visible light communication mobile phone is provided with signal input ports and signal output ports at intervals on the left and right sides; the visible light signal processing board integrates a PD receiver and a transmitting LED module; the visible light signal processing board is glued to the upper cover of the mobile phone; the PD receiver and the transmitting LED module are correspondingly fitted directly below the signal input port and the signal output port; the upper cover of the mobile phone is glued to the back shell of the mobile phone to form a 135° bend, so that when the mobile phone is held in the hand, the PD receiver and the transmitting LED module are basically horizontally upward to achieve the optimal angle to receive the light signal of the upper lamp or transmit the light signal to the upper lamp.

[0012] The PD receiver, transimpedance amplifier, differential amplifier, transmitting LED module, filtering circuit, high-speed driving circuit and part of the power management circuit are integrated on the visible light signal processing board, and the digital controlled variable gain amplifier, differential to single-ended amplifier, central processing unit, memory, audio processing circuit, LCD touch screen and LCD touch screen control / sampling circuit, standby button detection circuit, DIP switch and part of the power management circuit are integrated on the mobile phone mainboard; the mainboard and the visible light signal processing board are connected through the FFC connecting line to realize the power path and transmit the high-speed driving signal and the differential signal after the first differential amplification; the visible light signal processing board is glued to the upper cover of the mobile phone, and the PD integrated thereon is The receiver and transmitting LED modules are glued just below the signal input port and the signal output port; the microphone is glued into the mounting groove behind the microphone vent of the upper cover of the mobile phone; the upper cover of the mobile phone is glued to the back cover of the mobile phone; the lithium battery module is glued to the upper part of the inner part of the back shell of the mobile phone; the mobile phone motherboard is fixed to the lower part of the inner part of the back shell of the mobile phone by screws; the speaker is glued to the bottom of the back cover of the mobile phone; the dip switch is glued into the power switch mounting groove of the back shell of the mobile phone; the lower cover of the mobile phone is glued to the mobile phone button cap and then to the back shell of the mobile phone, and the mobile phone button cap just fits the standby button on the motherboard; the USB socket and the headphone socket on the motherboard expose their interfaces through the headphone hole and USB hole of the lower cover of the mobile phone; the outer screen film of the mobile phone is attached to the edge of the LCD touch screen.

[0013] The beneficial effects of the present invention are as follows: the present invention is based on wireless optical frequency communication technology, is applicable to a variety of environments, has strong confidentiality, and has low construction costs. It cooperates with the optical communication lamp base station to use visible light wireless communication to achieve the transmission and reception of text and voice signal data. The mobile phone form is flexible and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 It is a circuit principle block diagram of the present invention; Figure 2 It is a schematic diagram of the structure of the present invention; Figure 3 It is a schematic diagram of a lithium battery access switch circuit of the present invention.

[0016] In the figure: 1. Mobile phone back cover, 2. PD receiver, 3. Transmitter LED module, 4. Visible light signal processing board, 5. Signal input port, 6. Signal output port, 7. Microphone vent, 8. Mobile phone cover, 9. LCD touch screen, 10. Mobile phone button cap, 11. Mobile phone outer screen film, 12. Mobile phone bottom cover, 13. Mainboard fixing screws, 14. Standby button, 15 Mobile phone mainboard, 16. Lithium battery, 17. Power switch mounting hole. DETAILED DESCRIPTION

[0017] like Figure 1 A visible light communication mobile phone is shown, comprising: Optical signal receiving module: receiving visible light communication signals in space, including: PD receiver, optical signal processing and amplification circuit; Optical signal sending module: transmits optical signals into space, including: transmitting LED module and high-speed driving circuit; Human-computer interaction module: responsible for the interaction between the user and the mobile phone, including: LCD touch screen, audio processing circuit; CPU: The core component of a phone, responsible for performing calculations, processing data and controlling the system; Power module: provides power for various circuit modules of the mobile phone, including lithium battery, control switch, and power management unit; Appearance structural parts: protect internal components and provide users with necessary interactive interfaces.

[0018] The PD receiver converts the received optical signal into a weak current signal, which is connected to the central processing unit through a transimpedance amplifier, a differential amplifier, a digitally controlled variable gain amplifier, and a differential-to-single-ended amplifier in sequence. The central processing unit transmits the digital signal through a high-speed drive circuit, a filter circuit, and a transmitting LED module. The central processing unit is connected to a microphone, a speaker, and an earphone through an audio processing circuit; the central processing unit is connected to an LCD touch screen, and the LCD touch screen is controlled by an LCD screen drive circuit at the same time; the central processing unit is connected to a memory; and a lithium battery supplies power to various circuit modules of the mobile phone through a power management unit.

[0019] The transmitting LED module adopts infrared lamp beads, and the receiving lamp filters out the visible light band through a narrow-band filter. The high-speed driving circuit controls the high-speed switching of the infrared lamp beads to quickly send text messages or voice messages to the optical communication space for information transmission.

[0020] The emitting LED module adopts three infrared lamp beads with a wavelength of 850nm, and the visible light band is 360nm-780nm.

[0021] The human-computer interaction module collects the text or voice messages to be sent and transmits them to the central processing unit after encoding; the central processing unit decodes the encoding and generates a high-speed drive circuit control signal to control the light on and off of the transmitting LED module.

[0022] The PD receiver receives the downlink optical signal emitted by the visible light communication lamp and converts the optical signal into a weak current signal; the current signal passes through a transimpedance amplifier to convert the weak current signal into a voltage signal; the voltage signal is amplified by a differential amplifier and the single-ended voltage signal is converted into a differential voltage signal; the differential voltage signal is further amplified by a digitally controlled variable gain amplifier, and the digitally controlled variable gain amplifier determines the signal strength and dynamically amplifies the signal so that the signal can reach the normal acquisition judgment threshold; the further amplified differential voltage signal is converted into a single-ended voltage signal by a differential-to-single-ended amplifier and the common-mode interference in the differential signal is filtered out; the input optical signal is converted into a recognizable voltage signal after the above processing and transmitted to the central processing unit for decoding and modulation; the central processing unit converts the demodulated information into text or voice text messages through the human-computer interaction unit; and the information reception is completed.

[0023] like Figure 3 The lithium battery shown is connected to the mobile phone motherboard through a toggle switch, and the toggle switch is embedded in the power switch mounting hole 17 of the mobile phone rear shell 1. A single-pole double-throw toggle switch is selected. When the toggle switch is in gear 1, the mobile phone can be connected to an external charger to charge the lithium battery; when the toggle switch is in gear 2, the lithium battery supplies power to various circuit modules of the mobile phone. The mobile phone button cap is glued and fixed to the lower cover of the mobile phone and the standby button detection circuit of the motherboard to form a standby button to enter or exit the standby mode by pressing the button.

[0024] The upper cover of the visible light communication mobile phone is provided with signal input ports and signal output ports at intervals on the left and right sides; the visible light signal processing board integrates a PD receiver and a transmitting LED module; the visible light signal processing board is glued to the upper cover of the mobile phone; the PD receiver and the transmitting LED module are correspondingly fitted directly below the signal input port and the signal output port; the upper cover of the mobile phone is glued to the rear shell 1 of the mobile phone to form a 135° bend, so that when the mobile phone is held in the hand, the PD receiver and the transmitting LED module are basically horizontally upward to achieve the optimal angle to receive the light signal of the upper lamp or transmit the light signal to the upper lamp.

[0025] like Figure 2The PD receiver 2, transimpedance amplifier, differential amplifier, transmitting LED module 3, filtering circuit, high-speed driving circuit and part of the power management circuit are integrated on the visible light signal processing board 4, and the digitally controlled variable gain amplifier, differential to single-ended amplifier, central processing unit, memory, audio processing circuit, LCD touch screen 9 and LCD touch screen control / sampling circuit, standby button detection circuit, DIP switch and part of the power management circuit are integrated on the mobile phone motherboard 15; the mobile phone motherboard 15 and the visible light signal processing board 4 are connected through the FFC connecting line to realize the power supply path and transmit the high-speed driving signal and the differential signal after the first differential amplification; the visible light signal processing board 4 is glued to the mobile phone cover 8, on which the integrated PD receiver 2, transmitting LED The D module 3 is bonded to the bottom of the signal input port 5 and the signal output port 6; the microphone is glued to the mounting groove behind the microphone air outlet 7 of the mobile phone upper cover 8; the mobile phone upper cover 8 is glued to the mobile phone back cover; the lithium battery 16 is glued to the upper part of the inner part of the mobile phone back shell 1; the mobile phone motherboard 15 is fixed to the lower part of the inner part of the mobile phone back shell 1 by the motherboard fixing screws 13; the speaker is glued to the bottom of the mobile phone back cover; the dial switch is glued to the power switch mounting groove of the mobile phone back shell 1; the mobile phone lower cover 12 is glued to the mobile phone button cap 10 and then to the mobile phone back shell 1, and the mobile phone button cap 10 just fits the standby button 14 on the motherboard; the USB socket and the headphone socket on the motherboard expose their interfaces through the headphone hole and USB hole of the mobile phone lower cover; the mobile phone outer screen film 11 is attached to the edge of the LCD touch screen 9.

Claims

1. A visible light communication mobile phone, characterized in that: include: Optical signal receiving module: receiving visible light communication signals in space, including: PD receiver, optical signal processing and amplification circuit; Optical signal sending module: transmits optical signals into space, including: transmitting LED module and high-speed driving circuit; Human-computer interaction module: responsible for the interaction between the user and the mobile phone, including: LCD touch screen, audio processing circuit; CPU: The core component of a phone, responsible for performing calculations, processing data and controlling the system; Power module: provides power for various circuit modules of the mobile phone, including lithium battery, control switch, and power management unit; Appearance structural parts: protect internal components and provide users with necessary interactive interfaces.

2. A visible light communication mobile phone according to claim 1, characterized in that: The PD receiver converts the received optical signal into a weak current signal, which is connected to the central processing unit through a transimpedance amplifier, a differential amplifier, a digitally controlled variable gain amplifier, and a differential-to-single-ended amplifier in sequence. The central processing unit transmits the digital signal through a high-speed drive circuit, a filter circuit, and a transmitting LED module. The central processing unit is connected to a microphone, a speaker, and an earphone through an audio processing circuit; the central processing unit is connected to an LCD touch screen, and the LCD touch screen is controlled by an LCD screen drive circuit at the same time; the central processing unit is connected to a memory; and a lithium battery supplies power to various circuit modules of the mobile phone through a power management unit.

3. A visible light communication mobile phone according to claim 1, characterized in that: The transmitting LED module adopts infrared lamp beads, and the receiving lamp filters out the visible light band through a narrow-band filter. The high-speed driving circuit controls the high-speed switching of the infrared lamp beads to quickly send text messages or voice messages to the optical communication space for information transmission.

4. A visible light communication mobile phone according to claim 3, characterized in that: The emitting LED module adopts three infrared lamp beads with a wavelength of 850nm, and the visible light band is 360nm-780nm.

5. The visible light communication mobile phone according to claim 1, characterized in that: The human-computer interaction module collects the text or voice messages to be sent and transmits them to the central processing unit after encoding; the central processing unit decodes the encoding and generates a high-speed drive circuit control signal to control the light on and off of the transmitting LED module.

6. The visible light communication mobile phone according to claim 1, characterized in that: The PD receiver receives the downlink optical signal emitted by the visible light communication lamp and converts the optical signal into a weak current signal; the current signal passes through a transimpedance amplifier to convert the weak current signal into a voltage signal; the voltage signal is amplified by a differential amplifier and the single-ended voltage signal is converted into a differential voltage signal; the differential voltage signal is further amplified by a digitally controlled variable gain amplifier, and the digitally controlled variable gain amplifier determines the signal strength and dynamically amplifies the signal so that the signal can reach the normal acquisition judgment threshold; the further amplified differential voltage signal is converted into a single-ended voltage signal by a differential-to-single-ended amplifier and the common-mode interference in the differential signal is filtered out; the input optical signal is converted into a recognizable voltage signal after the above processing and transmitted to the central processing unit for decoding and modulation; the central processing unit converts the demodulated information into text or voice text messages through the human-computer interaction unit; and the information reception is completed.

7. The visible light communication mobile phone according to claim 1, characterized in that: The lithium battery is connected to the mobile phone mainboard through a toggle switch, the toggle switch is embedded in the power switch mounting hole of the mobile phone rear shell, a single-pole double-throw toggle switch is selected, when the toggle switch is in the first gear, the mobile phone is connected to an external charger to charge the lithium battery; when the toggle switch is in the second gear, the lithium battery supplies power to various circuit modules of the mobile phone, and the mobile phone button cap is glued and fixed to the lower cover of the mobile phone and the standby button detection circuit of the mainboard to form a standby button to enter or exit the standby mode by pressing the button.

8. The visible light communication mobile phone according to claim 1, characterized in that: The upper cover of the visible light communication mobile phone is provided with signal input ports and signal output ports at intervals on the left and right sides; the visible light signal processing board integrates a PD receiver and a transmitting LED module; the visible light signal processing board is glued to the upper cover of the mobile phone; the PD receiver and the transmitting LED module are correspondingly fitted directly below the signal input port and the signal output port; the upper cover of the mobile phone is glued to the back shell of the mobile phone to form a 135° bend, so that when the mobile phone is held in the hand, the PD receiver and the transmitting LED module are basically horizontally upward to achieve the optimal angle to receive the light signal of the upper lamp or transmit the light signal to the upper lamp.

9. The visible light communication mobile phone according to claim 1, characterized in that: The PD receiver, transimpedance amplifier, differential amplifier, transmitting LED module, filtering circuit, high-speed driving circuit and part of the power management circuit are integrated on the visible light signal processing board, and the digital controlled variable gain amplifier, differential to single-ended amplifier, central processing unit, memory, audio processing circuit, LCD touch screen and LCD touch screen control / sampling circuit, standby button detection circuit, DIP switch and part of the power management circuit are integrated on the mobile phone mainboard; the mobile phone mainboard and the visible light signal processing board are connected through the FFC connecting line to realize the power supply path and transmit the high-speed driving signal and the differential signal after the first differential amplification; the visible light signal processing board is glued to the upper cover of the mobile phone, The integrated PD receiver and transmitting LED module are attached to the signal input port and the signal output port; the microphone is glued to the mounting groove behind the microphone outlet hole 7 on the upper cover of the mobile phone; the upper cover of the mobile phone is glued to the back cover of the mobile phone; the lithium battery module is glued to the upper part of the inner part of the back shell of the mobile phone; the mobile phone motherboard is fixed to the lower part of the inner part of the back shell of the mobile phone through the motherboard fixing screws; the speaker is glued to the bottom of the back cover of the mobile phone; the dial switch is glued to the power switch mounting groove of the back shell of the mobile phone; the lower cover of the mobile phone is glued to the mobile phone button cap and then to the back shell of the mobile phone, and the mobile phone button cap just fits the standby button on the motherboard; the USB socket and the headphone socket on the motherboard are exposed through the headphone hole and USB hole of the lower cover of the mobile phone; The outer screen film of the mobile phone is attached to the edge of the LCD touch screen.

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