JP2011055397A - Visible light communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a communication speed of a visible light communication. <P>SOLUTION: A transmission part 10 intensity-modulates a white color LED (light-emitting diode) 13 serving also as an illumination by a multiplexed signal of an infrared communication signal and a visible light communication signal to transmit it. A dedicated light-receiving element 24 of a receiving part 20 receives a visible light emitted from the white color LED 13 to demodulate the infrared communication signal from the light-received signal by an IrDA (Infrared Data Association) circuit 28 and transmits it. An image generated on the basis of the received signal output from the IrDA circuit 28 is displayed on an indicator of a terminal 30. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a visible light communication system that performs communication using visible light emitted from illumination.

  In recent years, visible light communication in which LEDs that emit visible light are modulated by transmission data to transmit information has attracted attention. The luminous efficiency of visible LEDs has been rapidly improved in recent years, and in addition to lighting, electronic bulletin boards, car headlamps, etc. are rapidly spreading. Ubiquitous communication can be performed by performing visible light communication using a device in which these visible light LEDs are mounted. Moreover, since the light visible to the human eye becomes the communication medium, the human being can specify the transmission position, so the communication range can be limited and the security can be improved. It is expected as a supplemental application field. In addition, various applications have been proposed for communication in buildings where radio waves do not reach, identification of positions, communication in medical environments where there are precision devices such as pacemakers, and fusion with power line communication.

  One example is the “Visible Light ID System” standardized by the Visible Light Communication Consortium and standardized by JEITA (Electronic Information Technology Industries Association) in June 2007. This is a communication standard based on PPM (Pulse Position Modulation) modulation with a carrier frequency of 28.8 kHz and a data rate of 4.8 kbps. Details are described in the JEITA standard draft “Visible Light Communication System” (CP-1221) and “Visible Light ID System” (CP-1222), but can be applied to location information services and store guidance services. Moreover, IrDA (Infrared Data Association; data rate 115 kbps), which is a standard for infrared wireless communication, IrSimple (data rate up to 4 Mbps), which is a standard for high-speed infrared wireless communication, and infrared information is used as a shower. There is also an attempt to extend IrShower (registered trademark), a multipurpose information distribution tool that can be dropped, to visible light communication.

  When using visible light communication in a portable terminal such as a cellular phone or a PDA (Personal Digital Assistants), an environment in which signals from a plurality of LED light sources are received at the same time as in a store guide. In this case, it is necessary to separate optical signals from a plurality of light emitting sources. However, in the PPM modulation used in the visible light ID system and IrSimple, it is not possible to use the carrier frequency used in wireless communication or the separation by spread spectrum, so that a plurality of signals mixed in the light receiving element of the receiving unit. It will be difficult to separate them. Therefore, a method has been proposed in which an image sensor such as a charge coupled device (CCD) is provided in addition to the light receiving element, and the optical signal is separated in combination with image processing. For example, a visible light communication light receiving unit facing in the same direction as the CCD camera is provided in a mobile phone, and when a lighting device that also serves as a visible light communication light source is displayed on the display of the CCD camera, the visible light communication is performed at the light receiving unit. It has been proposed to receive the optical signal. Further, the mobile phone is provided with an imaging unit for imaging the subject and a plurality of light receiving elements for visible light communication, and the display area of the subject imaged by the imaging unit is divided into a plurality of areas corresponding to the plurality of light receiving elements, It has also been proposed to receive an optical signal from only the light receiving element corresponding to the designated area by designating the area where the light source is displayed among the divided areas.

JP 2005-218067 A JP 2007-295490 A

Masao Nakagawa, “Visible Light Communication”, Monthly Optronics, Vol.22, No.261, pp.120-125, September 2003 Shinichiro Haruyama, “Visible Light Communication”, IEICE Transactions A, Vol.J86-A, No.12, pp.1284-1291, December 2003 Masao Nakagawa, “Ubiquitous Visible Light Communication”, IEICE Transactions, Vol.J88-B, pp.351-359, February 2005 Supervised by Masao Nakagawa, Visible Light Communication Consortium, “The World of Visible Light Communication”, Industrial Research Committee, February 2006

However, the data rate of the visible light ID system is a low data rate of 4.8 kbps, and the communication speed is low. In addition, when the IrDA system is used, the communication speed is improved, but since it is not visible light, there is a problem that it is not known where the infrared light transmission source is.
Then, an object of this invention is to provide the visible light communication system which can improve the communication speed in visible light communication.

  The present invention relates to a transmitter that transmits visible light modulated by communication data, a receiver that receives visible light transmitted from the transmitter and demodulates communication data, and communication data demodulated by the receiver A visible light communication system comprising: an infrared communication transmission circuit for outputting an infrared communication signal modulated by communication data; and a visible light communication signal modulated by the communication data. A visible light communication transmission circuit that outputs, and a light emitting element that also serves as an illumination that emits visible light that is intensity-modulated by a combined signal of the infrared communication signal and the visible light communication signal, and the receiving unit includes a target Dedicated light receiving means comprising an image receiving means for picking up an image and a plurality of light receiving elements arranged in an array capable of receiving visible light emitted from the light emitting elements and arranged around the image receiving means An infrared communication receiving circuit that receives a light reception signal output from any one of the plurality of light receiving elements in the dedicated light receiving means, demodulates and outputs the infrared communication signal from the light reception signal, and A visible light communication receiving circuit that receives a light reception signal output from any one of the plurality of light receiving elements in the dedicated light receiving means and demodulates and outputs the visible light communication signal from the light reception signal; The display unit displays a target image captured by the image receiving unit, and divides the display area into a plurality of areas in association with the light receiving areas of the respective light receiving elements in the dedicated light receiving unit. Among the displayed areas, an area for receiving visible light emitted from the light emitting element can be designated, and when any of the areas is designated, the designated area is designated. And a control means for controlling so that a light reception signal received by the light receiving element corresponding to the rear is output from the dedicated light receiving element to the infrared communication receiving circuit and the visible light communication receiving circuit. It is said.

  According to the present invention, a light emitting element that is also used for illumination emits visible light whose intensity is modulated by a combined signal of an infrared communication signal and a visible light communication signal, and the infrared communication signal is demodulated from the received light signal received by the light receiving element. Therefore, it is possible to speed up communication with visible light.

It is a circuit block diagram which shows the structure of the visible light communication system of 1st Example of this invention. It is a circuit block diagram which shows the structural example of the terminal in the visible light communication system of 1st Example of this invention. It is a circuit block diagram which shows the other structural example of the transmission part in the visible light communication system of 1st Example of this invention. It is a circuit block diagram which shows the further another structural example of the transmission part in the visible light communication system of 1st Example of this invention. It is a circuit block diagram which shows the structure of the visible light communication system of 2nd Example of this invention. It is a circuit block diagram which shows the other structural example of the transmission part in the visible light communication system of 2nd Example of this invention. It is a circuit block diagram which shows the further another structural example of the transmission part in the visible light communication system of 2nd Example of this invention. It is a circuit block diagram which shows the detailed structure of the exclusive light receiving element in the light-receiving part of the visible light communication system in 1st Example of this invention. It is a circuit block diagram which shows the structure of the visible light communication system in 3rd Example of this invention. It is a flowchart of the reception data process performed in the visible light communication system of 3rd Example of this invention. It is a figure which shows the data structure of the data transmitted from the transmitter in the visible light communication system of 3rd Example of this invention. It is a figure which shows an example of the display screen displayed when receiving data processing is performed in the receiver of the visible light communication system of 3rd Example of this invention. It is a figure which shows the other example of the display screen displayed when a receiving data process is performed in the receiver of the visible light communication system of 3rd Example of this invention. It is a figure which shows the further another example of the display screen displayed when receiving data processing is performed in the receiver of the visible light communication system of 3rd Example of this invention. It is a figure which shows the further another example of the display screen displayed when receiving data processing is performed in the receiver of the visible light communication system of 3rd Example of this invention.

FIG. 1 is a circuit block diagram showing the configuration of the visible light communication system according to the first embodiment of the present invention.
The visible light communication system 1 according to the first embodiment of the present invention shown in FIG. 1 links a visible light ID system and a visible light version of IrDA system, and is provided with a transmitter 10 and a light receiver 20. One-way communication including the terminal 30 is performed. The transmission unit 10 in the visible light communication system 1 includes an IrDA transmission circuit 11 and an ID transmission circuit 12, a white LED 13, a processing unit 14, a ROM (Read Only Memory) 15, and a RAM (Random Access Memory) 16. Yes. A processing unit 14 including a CPU (Central Processing Unit) executes a management program (OS: Operating System), and controls the overall operation of the transmission unit 10 on the OS. Operation software such as a transmission control program executed by the processing unit 14 is stored in the nonvolatile ROM 15, and a work area and various data used when the processing unit 14 performs processing are stored in the RAM 16. The processing unit 14 performs a process of distributing and transmitting various data read from the ROM 15 or the RAM 16 to the IrDA transmission circuit 11 and the ID transmission circuit 12 by executing a transmission control program. The white LED 13 is an LED constituting the illumination device.

  The IrDA transmission circuit 11 is an IrDA infrared communication standard and has a data rate of 115 kbps, 1 Mbps, or 4 Mbps. Since the transmission data rate is high, data such as images, sounds, and moving images is processed by the processing unit 14. Sorted by and sent. The ID transmission circuit 12 has a carrier frequency of 28.8 kHz and a data rate of 4.8 kbps. Since the data rate is low, low-capacity data such as text data is distributed and transmitted by the processing unit 14. When the IrDA signal from the IrDA transmission circuit 11 and the ID signal from the ID transmission circuit 12 are combined and supplied to the white LED 13, the light intensity of the visible light emitted from the white LED 13 becomes the IrDA signal and the ID signal. Modulated by the combined signal. The white LED 13 is any one of a pseudo white LED, a two-wavelength white LED, and a three-wavelength white LED using a phosphor, and the response speed thereof is generally several tens of MHz for the two-wavelength and the three-wavelength white LEDs. The pseudo white LED used is several MHz. Note that the same data is repeatedly transmitted from the IrDA transmission circuit 11 and the ID transmission circuit 12.

  The terminal 30 is a personal computer (PC), a mobile phone, or the like, and its schematic configuration is shown in FIG. As shown in FIG. 2, the terminal 30 has a CPU 31, which executes a management program (OS) and controls the overall operation of the terminal 30 on the OS. The ROM 33 stores operation software such as a communication control program executed by the CPU 31, and the RAM 32 stores a work area and various data used when the CPU 31 performs processing. The USB I / F 34 is an interface of USB (Universal Serial Bus), which is one of data transmission path standards connecting peripheral devices and the terminal 30. The display 35 is a display such as a liquid crystal, and the operation element 36 is various keys or a pointing device. Each part is connected by a bus 37. The CPU 31 displays a text, an image, or the like based on the ID signal or the IrDA signal input from the light receiving unit 20 by executing the communication control program.

  The light receiving unit 20 includes a USB interface, and is attached to a USB terminal of a USB I / F 34 provided in the terminal 30 so that the light receiving unit 20 and the terminal 30 operate integrally. Since the white LED 13 of the transmission unit 10 in the visible light communication system 1 is an illumination device, the light receiving unit 20 attached to the terminal 30 can be easily directed to the transmission unit 10. When the light receiver 20 is directed toward the transmitter 10, the target image formed by the lens 21 is received by the CCD 22. The target image received by the CCD 22 includes the image of the transmission unit 10 and the surrounding image. The lens 23 is arranged side by side in substantially the same direction as the lens 21, and the target image formed by the lens 23 is received by the dedicated light receiving element 24. The dedicated light receiving element 24 is composed of a plurality of light receiving elements arranged in an array, and an output from only the light receiving element to which the signal components of the IrDA signal and the ID signal transmitted from the white LED 13 are applied as described later is taken out. Are input to a low pass filter (LPF) 25 and a high pass filter (HPF) 27.

  Here, the detailed configuration of the dedicated light receiving element 24 is shown in FIG. The dedicated light receiving element 24 is configured by integrating, for example, an 8 × 8 array of highly sensitive light receiving elements 24a such as a Darlington phototransistor and an avalanche photodiode (APD) created using CMOS integrated circuit technology. Has been. The selection circuit 24b has a decoder for selecting one or a plurality of light receiving elements 24a among the light receiving elements 24a arranged in, for example, 8 rows × 8 columns. The decoder decodes the control signal applied from the terminal 30 and controls the switches in each row and each column in the dedicated light receiving element 24 (eight) to thereby receive one or a plurality of light receiving elements in the light receiving element 24a. Element 24a is selected. In this way, the optical signal received by the light receiving element 24a selected by the selection circuit 24b is output from the selection circuit 24b. The output of the selection circuit 24b is input to the DC removal circuit 24c, and the direct current component is removed from the input signal current of the light receiving element 24a and output. The output of the DC removal circuit 24c is converted into a voltage signal by a transimpedance amplifier in which the current signal of the light receiving element 24a input and input to the I → V conversion circuit 24d is output. In addition, by providing the DC removal circuit 24c, when the light receiving element 24a is an APD, it is possible to remove the influence of a dark current that varies with temperature.

Next, a control method for taking out the output from only the light receiving element 24a to which the signal components of the IrDA signal and the ID signal are applied in the dedicated light receiving element 24 will be described with reference to FIG. As shown in FIG. 8, the dedicated light receiving element 24 on which the target image is formed by the lens 23 is configured by arranging the light receiving elements 24a in each area divided into an array of 8 rows × 8 columns, for example. Yes. Then, the target image formed by the lens 21 on the CCD 22 is displayed on the display 35 of the terminal 30. Image processing of the displayed target image is performed in the terminal 30, and the area of the target image is divided into the same number of rows and columns as the area divided in the dedicated light receiving element 24. This divided area is indicated by a broken line on the CCD 22 in a pseudo manner. When the user selects an area in which the illumination device to be the transmission unit 10 is displayed with reference to the target image on the display 35 of the terminal 30 by operating the operation element 36, the position information of the selected area is controlled. The signal is supplied from the terminal 30 to the dedicated light receiving element 24 as a signal. The dedicated light receiving element 24 receives the control signal, and selects and outputs only the output from the light receiving element 24a corresponding to the area at the position designated by the control signal by the selection circuit 24b. Thereby, the IrDA signal and the ID signal transmitted from the transmission unit 10 are input to the LPF 25 and the HPF 27 in the light receiving unit 20 without being affected by the background noise as much as possible.
In addition, by comparing the level of the light receiving signal for each divided area in the CCD 22 and automatically detecting the area of the maximum level, a control signal for selecting the detected area is automatically generated and the dedicated light receiving is performed. You may make it supply to the element 24. FIG.

  The IrDA signal and ID signal transmitted from the transmitter 10 that are input from the dedicated light receiving element 24 to the LPF 25 and HPF 27 are separated from the ID signal by the LPF 25 and input to the ID circuit 26, and the ID signal is demodulated by the ID circuit 26. The The demodulated data is, for example, text data, and this text data is supplied to the terminal 30 via the USB control circuit 29. Then, the text data is displayed on the display 35 of the terminal 30. Further, the IrDA signal is separated by the HPF 27 and input to the IrDA circuit 28, and the IrDA signal is demodulated by the IrDA circuit 28. The demodulated data is data such as images, sounds, and moving images. When a display control signal is applied from the terminal 30 to the IrDA circuit 28, a demodulated signal from the IrDA circuit 28 is supplied to the terminal 30 via the USB control circuit 29. In the terminal 30, when an image or a moving image is displayed on the display 35 and sound is included, the sound is reproduced. As a result, a text message transmitted from the transmission unit 10 is displayed on the terminal 30, and an image, a moving image, or the like selected by the user according to the message can be displayed on the display of the terminal 30. .

  In addition, when a plurality of transmission units 10 are installed at different installation locations and different information is transmitted from each transmission unit 10, different information transmitted from the plurality of transmission units 10 is received by the plurality of terminals 30. It can be considered. That is, when the transmission unit 10 and the terminal 30 are in the n: n or n: 1 situation, the user of the terminal 30 is appropriately notified of the situation of the plurality of transmission units 10 in order to display desired data on the terminal 30. It will be necessary. Therefore, first, the terminal 30 receives the ID signal and obtains text data corresponding to the index transmitted by the ID signal. In this case, each light receiving element 24a of the dedicated light receiving element 24 is scanned to detect which position of the light receiving element 24a has received the ID signal. However, when a plurality of ID signals have arrived, It is detected that the light receiving elements 24a at a plurality of corresponding positions receive different ID signals. Then, it is a divided area in the target image that is captured by the CCD 22 and displayed on the display 35 of the terminal 30, and is received by the area at the position of the light receiving element 24a where the ID signal is detected. The displayed text data is overlaid.

  Next, when the user refers to the displayed text data and clicks a character on one of the images, the clicked area is selected, and a control signal including position information of the area is generated. This control signal is applied to the dedicated light receiving element 24, and the light receiving signal in the light receiving element 24a in the area designated by the control signal is selected and output by the selection circuit 24b. The selected light receiving element 24a also receives the IrDA signal transmitted together with the ID signal from the transmitting unit 10, and this IrDA signal is input to the IrDA circuit 28 and demodulated. When a character on the image is clicked on the terminal 30, the terminal 30 applies a reception control signal to the IrDA circuit 28. As a result, the IrDA circuit 28 is controlled to output a demodulated IrDA signal. . As a result, data such as images, sounds, and moving images obtained by demodulating the IrDA signal is sent to the terminal 30 and displayed or reproduced on the display 35.

  In the dedicated light receiving element 24 of the visible light communication system 1 of the first embodiment described above, a dedicated light receiving element made up of a single light receiving element may be used instead of arranging the light receiving elements 24a on the array. In this case, the light receiving element is a photodiode, and the state of the object is imaged on the light receiving element by a lens optical system placed on the light receiving element. Since the light receiving range is narrowed by the lens optical system, it becomes a directional sharp light receiving system that receives light only in a specific direction, so that background light components can be removed and light signals from a plurality of light emitting signal sources can be easily separated. become. Further, in order to compensate for the sharp directivity, an image sensor such as a CCD or CMOS image sensor and a lens optical system are placed next to the light receiving element, and the state of the object is captured as an image. By displaying the light receivable area of the light receiving element on this image, the user can receive the ID signal by aligning the position of the transmitter 10 as the light emission signal source with this light receiving area, and the ID signal is displayed on the screen. The demodulated text data is displayed. By looking at the contents of the text and operating a click or button on the text, the IrDA signal is received by the light receiving element as described above, so that an image, sound, moving image, or the like can be displayed.

  Next, another configuration example of the transmission unit 10 in the visible light communication system 1 of the first embodiment is shown in FIG. The transmission unit 10 shown in FIG. 3 includes an IrDA transmission circuit 11 and an ID transmission circuit 12, a white LED 13 and an infrared LED 17, a processing unit 14, a ROM 15 and a RAM 16. Since the IrDA transmission circuit 11, the ID transmission circuit 12, the processing unit 14, the ROM 15 and the RAM 16 are as described above, the description thereof is omitted. The infrared LED 17 is supplied with the IrDA signal from the IrDA transmission circuit 11, and the light intensity of the infrared light emitted from the infrared LED 17 is modulated and transmitted by the IrDA signal. The white LED 13 is an LED that constitutes the lighting device, and the light intensity of white visible light emitted by the ID signal from the ID transmission circuit 12 is modulated and transmitted. Note that the processing unit 14 executes a transmission control program to distribute various data read from the ROM 15 or the RAM 16 to the IrDA transmission circuit 11 and the ID transmission circuit 12 for transmission. With such a configuration of the transmission unit 10, it is possible to receive infrared light emitted from the infrared LED 17 of the transmission unit 10 using existing infrared communication means generally provided in mobile phones, The transmitted data can be displayed on the display of the mobile phone. In this case, the position of the transmission unit 10 facing the mobile phone can be specified by looking at the visible light emitted from the white LED 13.

  Furthermore, the further another structural example of the transmission part 10 in the visible light communication system 1 of 1st Example is shown in FIG. The transmission unit 10 shown in FIG. 4 includes an IrDA transmission circuit 11 and an ID transmission circuit 12, a processing unit 14, a ROM 15 and a RAM 16, and an LED 18 composed of a red LED and green and blue LEDs. Since the IrDA transmission circuit 11, the ID transmission circuit 12, the processing unit 14, the ROM 15 and the RAM 16 are as described above, the description thereof is omitted. The IrDA signal from the IrDA transmission circuit 11 is supplied to the LED 18, and the light intensity of the light emitted from the red LED in the LED 16 is modulated and transmitted by the IrDA signal. Further, an ID signal from the ID transmission circuit 12 is supplied to the LED 18, and the light intensity of the light emitted from the green and blue LEDs in the LED 18 is modulated and transmitted by the ID signal. The LED 18 is an LED that constitutes a lighting device, and an ID signal and an IrDA signal that are wavelength-multiplexed are transmitted from the LED 18. Note that the processing unit 14 executes a transmission control program to distribute various data read from the ROM 15 or the RAM 16 to the IrDA transmission circuit 11 and the ID transmission circuit 12 for transmission.

Next, FIG. 5 shows a circuit block diagram showing the configuration of the visible light communication system according to the second embodiment of the present invention. The visible light communication system 2 of the second embodiment shown in FIG. 5 is capable of bidirectional communication.
The visible light communication system 2 according to the second embodiment of the present invention shown in FIG. 5 includes a transmitter 40, a light receiver 50, and a terminal 30. The transmission unit 40 includes an IrDA transmission / reception circuit 41 and an ID transmission circuit 42, a white LED 43, a reception photodiode (PD) 44, a processing unit 45, a ROM 46 and a RAM 47. The processing unit 45 including a CPU executes a management program (OS) and controls the overall operation of the transmission unit 40 on the OS. Operation software such as a transmission / reception control program executed by the processing unit 45 is stored in the nonvolatile ROM 46, and a work area and various data used when the processing unit 45 performs processing are stored in the RAM 47. The processing unit 45 executes a transmission / reception control program so as to distribute and transmit various data read from the ROM 46 or the RAM 47 to the IrDA transmission / reception circuit 41 and the ID transmission circuit 42 based on the received information. The white LED 43 is an LED constituting the illumination device, and the PD 44 is an infrared PD or a visible light PD.

  The IrDA transmission / reception circuit 41 is an IrDA infrared wireless communication standard, and has a data rate of 115 kbps, 1 Mbps, or 4 Mbps. Since the transmission data rate is high, data such as images, sounds, and moving images are processed by the processing unit. Sorted by 45 and transmitted. The ID transmission circuit 42 has a carrier frequency of 28.8 kHz and a data rate of 4.8 kbps. Since the data rate is low, low-capacity data such as text data is distributed and transmitted by the processing unit 45. The IrDA signal from the IrDA transmission / reception circuit 41 and the ID signal from the ID transmission circuit 12 are combined and supplied to the white LED 43, so that the light intensity of visible light emitted from the white LED 43 is the IrDA signal and the ID signal. Modulated by the combined signal. The white LED 43 is any one of a pseudo white LED, a two-wavelength white LED, and a three-wavelength white LED using a phosphor. Further, the optical signal received by the PD 44 is input to the IrDA transmission / reception circuit 41 and demodulated. The processing unit 45 reads information selected based on the signal demodulated from the ROM 46 or the RAM 47 and controls the information to be transmitted from the white LED 43. The same data is repeatedly transmitted from the ID transmission circuit 42.

The schematic configuration of the terminal 30 is as shown in FIG.
The light receiving unit 50 is provided with a USB interface, and is attached to a USB terminal of a USB I / F 34 provided in the terminal 30 so that the light receiving unit 50 integrally operates with the terminal 30. Since the white LED 43 of the transmission unit 40 in the visible light communication system 2 is an illumination device, the light receiving unit 50 attached to the terminal 30 can be easily directed to the transmission unit 40. When the light receiver 50 is directed to the transmitter 40, the target image formed by the lens 51a is received by the CCD 51b. The target image received by the CCD 51b includes the image of the transmission unit 40 and the surrounding image. At the same time, the target image formed by the lens 52a is received by the dedicated light receiving element 52b. The lens 52a is arranged side by side facing substantially the same direction as the lens 51a. From the dedicated light receiving element 52b in which a plurality of light receiving elements are arranged in an array, the output from only the light receiving element to which the signal component of the IrDA signal and ID signal transmitted from the white LED 43 hits is extracted and sent to the LPF 54 and the HPF 56. Entered.

Since the detailed configuration of the dedicated light receiving element 52b is the same as that of the dedicated light receiving element 24 shown in FIG. 8 described above, the description thereof will be omitted. The signal received by the received light receiving element is output from the dedicated light receiving element 52b. In addition, the control method for extracting the output from only the light receiving element to which the signal components of the IrDA signal and the ID signal are applied in the dedicated light receiving element 52b is as described above. When the user selects an area where the illumination device serving as the transmission unit 40 is displayed, position information of the selected area is supplied from the terminal 30 to the dedicated light receiving element 52b as a control signal. The dedicated light receiving element 52b selects and outputs only the output from the light receiving element in the area corresponding to the control signal. Thus, the IrDA signal and the ID signal transmitted from the transmission unit 40 are input to the LPF 54 and the HPF 56 in the light receiving unit 50 without being affected by the background noise as much as possible.
In addition, by comparing the level of the light reception signal for each divided area in the CCD 51b and automatically detecting the area of the maximum level, a control signal used as position information for selecting the detected area is automatically generated. Then, it may be supplied to the dedicated light receiving element 52b.

  The IrDA signal and the ID signal transmitted from the transmitter 40 that are input from the dedicated light receiving element 52b to the LPF 54 and the HPF 56 are separated from the ID signal by the LPF 54 and input to the ID circuit 55, and the ID signal is demodulated by the ID circuit 55. The The demodulated data is, for example, text data, and this text data is supplied to the terminal 30 via the USB control circuit 58. Then, the text data is displayed on the display 35 of the terminal 30. This text data is, for example, a message or an index, and the user selects information to be acquired from the transmission unit 40 by looking at the contents of the displayed text data. Upon receiving this selection, the terminal 30 generates selection information and sends it to the light receiving unit 50, and the light receiving unit 50 transmits the selection information from the LED 53 for transmission via the USB control circuit 58. The LED 53 corresponds to the PD 44, and may be an LED that emits visible light or an LED that emits infrared light.

  The selection information transmitted from the LED 53 is received by the reception PD 44 in the transmission unit 40, received by the IrDA transmission / reception circuit 41, and the selection information is demodulated. The processing unit 45 reads the information instructed by the selection information from the ROM 46 or the RAM 47 and controls the information to be transmitted to the light receiving unit 50 via the IrDA transmission / reception circuit 41 and the white LED 43. The information transmitted from the IrDA transmission / reception circuit 41 is received by the light receiving element in the selected area of the dedicated light receiving element 52b, and the IrDA signal is separated by the HPF 56 and input to the IrDA circuit 57. The input IrDA signal is Demodulated. The obtained data such as images, sounds or moving images is sent to the terminal 30 via the USB control circuit 58. In the terminal 30, when an image or a moving image is displayed on the display 35 and sound is included, the sound is reproduced. As a result, the terminal 30 can display an image, a moving image, or the like requested by the user on the display 35 of the terminal 30.

  When the transmitter 40 and the terminal 50 are n: n or n: 1, the terminal 30 receives the ID signal and acquires text data corresponding to the index transmitted by the ID signal. In this case, each light receiving element of the dedicated light receiving element 52b is scanned to detect which position of the light receiving element has received the ID signal. When a plurality of ID signals have arrived, this corresponds to the arrival direction. It is detected that the light receiving elements 24a at a plurality of positions receive different ID signals. Then, the text data received in the area is a divided area in the target image captured by the CCD 51b and displayed on the display of the terminal 30, in the area of the light receiving element where the ID signal is detected. Are displayed in layers. Next, when the user clicks a character on any image of the displayed text data, the clicked area is selected, and a control signal including position information of the clicked area is generated in the terminal 30. This control signal is applied to the dedicated light receiving element 52b, and the light receiving signal in the light receiving element in the area designated by the control signal is selected and output from the dedicated light receiving element 52b. The selected light receiving element receives the IrDA signal transmitted from the transmitter 40 together with the ID signal, and the IrDA signal is input to the IrDA circuit 57 and demodulated. Data such as an image, sound, and moving image obtained by demodulating the IrDA signal is sent to the terminal 30 and displayed or reproduced on the display 35.

  Even in this case, when the user selects information that the user wants to acquire from the transmission unit 40 by looking at the content of the text displayed on the display of the terminal 30, the selection information is transmitted to the transmission unit 40 via the LED 53, and the selection information is displayed. The received processing unit 45 of the transmitting unit 40 transmits information specified by the selection information from the IrDA transmission / reception circuit 41 to the light receiving unit 50 by the white LED 43. As a result, the IrDA signal is received by the dedicated light receiving element 52 b in the light receiving unit 50, and the IrDA signal is extracted by the HPF 56 and demodulated by the IrDA circuit 57. Data such as images, sounds, or moving images obtained in this way is sent to the terminal 30 for display or reproduction.

  Next, another configuration example of the transmission unit 40 in the visible light communication system 2 of the second embodiment is shown in FIG. The transmission unit 40 illustrated in FIG. 6 includes an IrDA transmission / reception circuit 41 and an ID transmission circuit 42, an infrared LED 48 and a white LED 43, a reception PD 44, a processing unit 45, a ROM 46, and a RAM 47. Since the IrDA transmission / reception circuit 41, the ID transmission circuit 42, the reception PD 44, the processing unit 45, the ROM 46, and the RAM 47 are as described above, description thereof is omitted. The infrared LED 48 is supplied with the IrDA signal from the IrDA transmission / reception circuit 41, and the intensity of the infrared light emitted from the infrared LED 48 is modulated by this IrDA signal and transmitted. The white LED 43 is an LED that constitutes the illumination device, and the light intensity of white visible light emitted by the ID signal from the ID transmission circuit 42 is modulated and transmitted. The processing unit 45 distributes various data selectively read from the ROM 46 or the RAM 47 to the IrDA transmission / reception circuit 41 and the ID transmission circuit 42 based on the received selection information by executing the transmission / reception control program. Processing to send. With such a configuration of the transmission unit 40, it is possible to receive infrared light emitted from the infrared LED 48 of the transmission unit 40 using existing infrared communication means generally provided in mobile phones, The transmitted data can be displayed on the display of the mobile phone. In this case, the position of the transmission unit 40 facing the mobile phone can be specified by looking at the visible light emitted from the white LED 43.

  Furthermore, the further another structural example of the transmission part 40 in the visible light communication system 2 of 2nd Example is shown in FIG. The transmission unit 40 shown in FIG. 7 includes an IrDA transmission / reception circuit 41 and an ID transmission circuit 42, a PD 44 for reception, an LED 49 composed of red LEDs, green and blue LEDs, a processing unit 45, a ROM 46 and a RAM 47. ing. Since the IrDA transmission / reception circuit 41, the ID transmission circuit 42, the reception PD 44, the processing unit 45, the ROM 46, and the RAM 47 are as described above, description thereof is omitted. The LED 49 is supplied with the IrDA signal from the IrDA transmission / reception circuit 41, and the intensity of the light emitted from the red LED in the LED 49 is modulated and transmitted by the IrDA signal. Further, an ID signal from the ID transmission circuit 42 is supplied to the LED 49, and the light intensity of the light emitted from the green and blue LEDs in the LED 49 is modulated and transmitted by the ID signal. The LED 49 is an LED that constitutes the lighting device, and an ID signal and an IrDA signal that are wavelength-multiplexed are transmitted from the LED 49. The processing unit 45 distributes various data selectively read from the ROM 46 or the RAM 47 to the IrDA transmission / reception circuit 41 and the ID transmission circuit 42 based on the received selection information by executing the transmission / reception control program. Processing to send.

  In the visible light communication system 1 of the first embodiment and the visible light communication system 2 of the second embodiment described above, instead of mounting the light receiving unit 20 (50) on the terminal 30 via the USB interface, the terminal 30 Alternatively, the light receiving unit 20 (50) may be built in. In this case, when the terminal 30 is a mobile phone, the existing camera can be used as the CCD 22 (51b). Therefore, the lens for the dedicated light receiving element is arranged on the existing camera lens in the case of the mobile phone. Will be placed. Further, when the IrDA signal is transmitted from the transmitter 10 (40) by infrared light, the IrDA signal can be received by using an IrDA communication function generally provided in a mobile phone.

Next, FIG. 9 shows the configuration of the visible light communication system 3 according to the third embodiment of the present invention.
The visible light communication system 3 of the third embodiment shown in FIG. 9 includes a transmitting device 60 and a mobile phone 71 or a handy type PC 72 as a receiving device 70 that receives visible light and infrared light transmitted from the transmitting device 60. I have. Unidirectional communication is performed between the mobile phone 71 and the PC 72 which are the transmitting device 60 and the receiving device 70. The transmission device 60 includes a processing unit 61, a ROM 62 and a RAM 63, a communication I / F 64, an IrDA transmission circuit 65 and an ID transmission circuit 66, an infrared LED 67, and a white LED 68. The communication I / F 64 is a LAN adapter connected to a local area network (LAN). The other components are the same as those of the IrDA transmission circuit 11 or RAM 16 shown in FIG. An IrDA signal from the IrDA transmission circuit 65 is supplied to the infrared LED 67 built in the lighting device, and the light intensity of the infrared light emitted from the infrared LED 67 is modulated and transmitted by the IrDA signal. . The white LED 68 is an LED that also serves as an illumination device, and the light intensity of the white visible light emitted by the ID signal from the ID transmission circuit 66 is modulated and transmitted. The processing unit 61 performs processing for transmitting various data read from the ROM 62 or the RAM 63 to the IrDA transmission circuit 65 and the ID transmission circuit 66 by executing transmission data processing.

  The cellular phone 71 is provided with an IrDA window 71a for receiving infrared light from the infrared LED 67, and an IrDA signal can be demodulated by a built-in IrDA transmission / reception circuit. Further, the mobile phone 71 is provided with a display 71b and an operator 71c composed of a numeric keypad and buttons. The mobile phone 71 is wirelessly connected to the mobile phone network 7 and can perform calls and mail exchanges between other mobile phones and the like, and can access the Internet 4 to acquire various data on the Internet. it can. The PC 72 includes a USB terminal and a LAN adapter. The USB terminal is provided with a light receiving unit 73 having the same configuration as the light receiving unit 20 shown in FIG. Infrared light and visible light from the white LED 68 are received to demodulate the ID signal and the IrDA signal. The LAN adapter is connected to the LAN 8, and the PC 72 can access the Internet 4 via the LAN 8 and acquire various data on the Internet. In the receiving device 70, the mobile phone 71 and the PC 72 can be directed to the transmitting device 60 by visually recognizing visible light emitted from the white LED 68 that is an illumination device in the transmitting device 60. In addition, ID signals or IrDA signals are not compatible with billing systems, so free information distribution is expected. By using these effectively, billing can be suppressed by shortening the connection time to the mobile phone network or LAN. Become.

  The transmission devices 60 are installed in different places and rooms, and each transmission device 60 reads distribution information suitable for the transmission device 60 from the database (DB) 5 on the LAN 6 and repeatedly transmits the distribution information. . In this case, the transmission device 60 activates transmission data processing stored in the ROM 62 to generate and transmit distribution information. In the portable receiving device 70, profile information (transmitter information, reception time, usage service) held by the receiving device 70 out of the distribution information received from the transmitting device 60 provided as a lighting device in the current location. The information requested by the user is extracted semi-automatically based on the history and displayed on the displays 71b and 72a. In this case, the cellular phone 71 and the PC 72, which are the receiving device 70, select and display the information requested by the user semi-automatically by starting the reception data processing.

  Since the visible light communication system 3 is unidirectional communication, the communicable distance can be increased only by increasing the output of the transmission device 60. Further, since the transmitting device 60 cannot distribute enormous information sequentially due to the bandwidth limitations of visible light communication and infrared light communication, only the necessary information that is variable in ID transmission and IrDA transmission is transmitted. Thus, data set information, which is fixed data such as image parts for final display that hardly change, is acquired through the Internet 4 when the service is used for the first time, and is stored in the mobile phone 71 or the PC 72 serving as the receiving device 70. deep. In addition, if the request information for each access is stored as profile information in the requested mobile phone 71 or PC 72, the data requested by the user can be displayed semi-automatically by referring to the profile information at the next use. As a result, the user activates the received data processing when the same service is used by the same or nearby transmitting device 60 for the second time and thereafter, and reads the stored information, thereby displaying the service intended immediately on the display. It becomes possible.

  In the transmission data processing executed by the transmission device 60, intermediate data of each category is generated by acquiring necessary information for each category through either the Internet 4 or the database 5 or both. Then, transmission data generated by adding transmission device identification information (ID), position information, and generation time for specifying each transmission device 60 to the intermediate data is temporarily stored in the RAM 63. Next, the operation of reading and transmitting the transmission data temporarily stored in the RAM 63 is repeatedly performed. In the reception data processing executed by the reception device 70, the demodulated reception information file is read and stored in an internal storage means designated in advance. Then, the stored reception information file is read, display data is created, and the reception information is displayed on the display.

The transmission data transmitted from the transmission device 60 is a single file having a predetermined format (for example, XML). The data structure of this transmission data is shown in FIG.
As shown in FIG. 11, the transmission data includes “transmission device information” including the transmission device ID of the transmission device 60, position information, and time information of generation time, and externals of each category for interpreting and displaying the received data. "Category 1 data set / URI", "Category 2 data set / URI" consisting of URI (Uniform Resource Identifier) indicating the location on the Internet of data set information consisting of subset, image data, and display format design ... And “category 1 information”, “category 2 information”,... Thus, the data set information that is fixed without being changed is acquired by each receiving device 70 via the Internet 4. In addition, since the data set information acquired in the receiving device 70 is stored in the receiving device 70, the data set information need only be acquired at the first use.

Next, FIG. 10 shows a flowchart of received data processing executed by the mobile phone 71 and the PC 72 that are the receiving device 70. This flowchart will be described below with an example of a service. This service is an example of a service for providing academic information on campus. Note that transmission data having the same data structure shown in FIG. 11 is repeatedly transmitted from the IrDA transmission circuit 65 and the ID transmission circuit 66.
The lighting devices installed in the classrooms and hallways of the university campus are the above-described transmitting device 60, and the received data processing is performed by pointing the mobile phone 71 or the PC 72 serving as the receiving device 70 to one of the transmitting devices 60. In step S10, it is determined whether an ID signal for visible light ID communication or an IrDA signal for infrared light communication is received. If it is determined that the ID signal or IrDA signal is not received, the received data processing ends. If it is determined that the ID signal or IrDA signal is received, the process proceeds to step S11 and the received ID signal or IrDA is received. The signal is demodulated and the information is displayed on the displays 71b and 72a of the receiver 70. The user sees this display and determines whether or not to receive it. If it is determined in step S12 that the user has performed an operation of receiving information, the process proceeds to step S13. If it is determined in step S12 that the user has performed an operation that does not receive information, the received data processing ends.

  In step S13, the position information of the transmission device 60 and the current time information are read from the received ID signal or IrDA signal, and a data set list of received data is acquired. Further, a locally acquired data set list and local profile information stored in the receiving device 70 are read. Next, in step S14, it is determined whether the profile information includes a history of the same transmission device as the transmission device 60 that transmitted the ID signal or IrDA signal received this time, or a nearby transmission device. If it is determined that there is no history, the process branches to step S20, where the data of the service category list is extracted from the received data, the category list is displayed based on the extracted data, and waiting for user input. It is said. FIG. 12 shows an example of a display screen on which a category list of displayed services is displayed. In this display screen, “The following services are available at this location” is displayed, followed by “ A category list consisting of “information”, “classroom guidance” and “classroom currently in lecture” is displayed. If the user gives an instruction to select the category of service he / she wants to receive by viewing the displayed category list, the process proceeds to step S21.

  Here, when the category of “cancellation supplementary lecture information” is selected as the service received by the user, it is determined whether or not it is possible to connect to the Internet in step S21, and if it is determined that the Internet can be connected, step S22. Proceed to In step S22, a data set for the category selected by accessing the Internet is acquired. If it is determined in step S14 that there is a history of the same or a nearby transmitter in the profile information, the process proceeds to step S15, whether there is a match with the category used, and the data set of that category Is determined to be local. Here, since there is no history record in the local storage means serving as the receiving device 70 at the time of the first access, it is determined that there is no data set, the process proceeds to step S21, and the processing of step S21 and step S22 is performed. As described above, the data set is acquired by accessing the Internet 4. If it is determined in step S21 that it is not possible to connect to the Internet, the received data processing ends. Further, when the process of step S22 is completed, or when it is determined that there is an item that matches the category used in step S15 and the data set is local, the process of step S16 is performed.

  In step S16, the display contents to be displayed in the category selected from the received data using the data set and the profile information or the matching category are extracted from the received data. In this case, in order to extract the display contents of the category of “cancellation supplementary lecture information”, information on the subject type and department that the user has taken is required. However, since there is no user attendance information at the first use, data related to a display screen for inputting attendance information is acquired via the Internet 4, and the user attendance information shown in FIG. 13 is input to the displays 71b and 72a of the receiving device 70. The display screen to be displayed is displayed. On this display screen, “Please select the type of lecture” is displayed, followed by “General Liberal Arts”, “Mathematics”, “Physics”, “Chemistry”, “Machine”, “Electricity” as a list of subject types. , "Information", "Other" list is displayed, and as a list by department, lists consisting of "Mechanical engineering", "Electrical engineering", "Applied chemistry", "Measurement engineering", "Management engineering" Is done. In step S17, it is determined whether or not user input is necessary. If it is determined that user input is necessary, the process proceeds to step S23. If it is determined that user input is not necessary, the process proceeds to step S18. Here, it is assumed that the operation elements 71c and 72b of the receiving device 70 are operated by the user in step S23, and, for example, an operation for selecting “physical” as the subject type is performed.

  As a result, a check box list is generated as display data and displayed on the displays 71 b and 72 a of the receiving device 70. FIG. 14 shows a display screen of the check box list in which the user operates the operation elements 71c and 72b to input the course subjects in the check box list. In the display screen shown in FIG. 14, “Magnetic Science”, “Material Mechanics”, “Solid Physics”, and “Physical Chemistry” in the check box list are subjects, and “Hamilton Mechanics”, “Quantum Mechanics”, “Statistics” It is shown that subjects of “Physics”, “Continuous Mechanics”, and “Low Temperature Physics” have not been taken. The information on the subjects and the like input here is stored in the profile information and is referred to from the next time onward. If it is determined in step S17 that no user input is required, and if user input to the check box list is completed, the process proceeds to step S18.

  In step S18, the updated profile information and the provided classroom that is the position of the acquired transmitting device 60 and the data related to “cancellation supplementary lecture information” that is finally displayed that matches the current time are extracted from the received data and extracted. Display data is generated based on the received data and displayed on the displays 71b and 72a of the receiving device 70 in step S19. FIG. 15 shows an example of a display screen for the category “Training Lecture Information” displayed. Referring to Figure 15, “The class“ Distributed Processing ”is currently being held in your 14-202 classroom. You are not attending this lecture. Please register from the bottom link.” Is displayed. Next, based on the user's course information, the message “No lectures are currently taking place at the 3rd time of Wednesday” is displayed, and “Closing Information 10/02 Physical Chemistry 10/09 Physical Chemistry” is displayed. At the same time, “Supplementary Information 01/30 Physical Chemistry Class 12-108” is displayed. Furthermore, “>> change registered lecture” for registering a class of “distributed processing” performed in the classroom where the user is present as a course subject is displayed.

  From the next time on, since the receiving apparatus 70 has the data set and registered subject information for receiving the academic information providing service in the university campus in the profile information, the receiving apparatus 70 is connected to one of the transmitting apparatuses 60 in the classroom. The reception data processing is started by directing the cellular phone 71 or PC 72 set to 70 so that the display screen of the “cancellation supplementary lecture information” that is the final output is displayed on the displays 71 b and 72 a of the receiving device 70. Become. In addition, when a category selection screen is displayed in the process of step S16 and the category “currently being taught” is newly selected in the processes of step S17 and step S23, for example, as described above. By performing the same processing as the processing and using the data set and profile information, the display contents to be displayed in this category are extracted from the received data, so that the class being lectured and the classroom being lectured are displayed. The display data of “currently lectured class” is generated and the display screen is displayed. When the “classroom guidance” category is selected, since the current position is the position of the position information of the transmission device 60, navigation information from the classroom of the transmission device 60 to the destination classroom is displayed. There is this place, and you may make it display the map which displayed the guidance route. After this, let the user choose arbitrarily whether to make “Class supplementary information” default or “Class currently in lecture” or “Classroom guidance”, or define a conditional expression in the data set (Example: priority is given to the one with higher usage frequency) or the condition information may be included in the visible light ID.

In the present invention described above, a mass storage device such as a hard disk may be provided in the transmission unit (transmission device), terminal, or reception device, and various software and various data may be stored in the mass storage device.
In addition, in the visible light communication system 3 of the third embodiment described above, since it is a one-way communication, it cannot accept a request from a user, and an unspecified number of users present on the spot like a bulletin board. Delivery is done. The user who receives the distribution obtains additional information from the Internet as necessary. However, since the transmission device 60 and the reception device 70 can be connected to the Internet in the administrator, a request can be sent from the reception device 70 to the transmission device 60 through the Internet 4. In this case, the transmission device 60 that has received the request transmits the requested data via the IrDA transmission circuit 65 and the infrared LED 67, the reception device 70 receives the transmitted data, and the received data is displayed on the display. It can be displayed.
Furthermore, in the visible light communication system 3 of the third embodiment, transmission data having the same content is transmitted from the IrDA transmission circuit 65 and the ID transmission circuit 66, but data set information including image data and the like is acquired from the Internet. Alternatively, the data may be transmitted from the IrDA transmission circuit 65 having a high data rate, and the text-based data may be transmitted from the ID transmission circuit 66. In this case, it is necessary to provide the mobile phone 71 with a visible light ID communication function.
Furthermore, a visible light ID lens and a dedicated light receiving element may be additionally provided in the mobile phone 71. In this case, the added lenses are preferably arranged side by side so as to face the same direction as the IrDA window 71a. Furthermore, in the visible light communication system of the present invention, the light receiving unit is connected to the terminal by USB. However, the light receiving unit is not limited to USB, but is a terminal (PC) such as IEEE (Institute of Electrical and Electronic Engineers) 1394 or CardBus. The light receiving unit may be connected to the terminal using a known data transmission path connecting the device and the peripheral device.

DESCRIPTION OF SYMBOLS 1 Visible light communication system, 2 Visible light communication system, 3 Visible light communication system, 4 Internet, 5 Database, 6 LAN, 7 Mobile telephone network, 8 LAN, 10 Transmission part, 11 IrDA transmission circuit, 12 ID transmission circuit, 13 White LED, 14 processing section, 15 ROM, 16 RAM, 17 infrared LED, 20 light receiving section, 21 lens, 22 CCD, 23 lens, 24 dedicated light receiving element, 24a light receiving element, 24b selection circuit, 24c removal circuit, 24d I → V conversion circuit, 25 LPF, 26 ID circuit, 27 HPF, 28 IrDA circuit, 29 USB control circuit, 30 terminal, 31 CPU, 32 RAM, 33 ROM, 34 USB I / F, 35 display, 36 operator, 37 bus, 40 transmitter, 41 IrDA transceiver circuit, 42 ID transmission Circuit, 43 White LED, 44 PD, 45 Processing unit, 46 ROM, 47 RAM, 48 Infrared LED, 49 LED, 50 Light receiving unit, 50 Terminal, 51a lens, 51b CCD, 52a lens, 52b Dedicated light receiving element, 53 LED , 54 LPF, 55 ID circuit, 56 HPF, 57 IrDA circuit, 58 USB control circuit, 60 transmission device, 61 processing unit, 62 ROM, 63 RAM, 64 communication IF, 65 IrDA transmission circuit, 66 ID transmission circuit, 67 red Outer LED, 68 White LED, 70 Receiver, 71 Mobile phone, 71a IrDA window, 71b Display, 71c Operator, 72 PC, 72a Display, 72b Operator, 73 Light receiver

Claims (5)

Transmitter for transmitting visible light modulated with communication data, receiver for receiving visible light transmitted from the transmitter and demodulating communication data, and display for displaying communication data demodulated by the receiver A visible light communication system comprising:
The transmitter is
An infrared communication transmission circuit for outputting an infrared communication signal modulated by communication data;
A visible light communication transmission circuit that outputs a visible light communication signal modulated by communication data; and
A light emitting element that also serves as an illumination that emits visible light whose intensity is modulated by a combined signal of the infrared communication signal and the visible light communication signal;
The receiver is
An image receiving means for capturing a target image;
Dedicated light receiving means that is arranged around the image receiving means, and is composed of a plurality of light receiving elements arranged in an array capable of receiving visible light emitted from the light emitting elements,
An infrared communication receiving circuit that receives a light reception signal output from any one of the plurality of light receiving elements in the dedicated light receiving means, demodulates and outputs the infrared communication signal from the light reception signal;
A visible light communication receiving circuit that receives a light reception signal output from any one of the plurality of light receiving elements in the dedicated light receiving means and demodulates and outputs the visible light communication signal from the light reception signal; Prepared,
The display unit
A display unit that displays a target image captured by the image receiving unit and divides the display area into a plurality of areas in association with the light receiving areas of the respective light receiving elements in the dedicated light receiving unit;
Of the divided display areas, an area for receiving visible light emitted from the light emitting element can be designated, and when any of the areas is designated, a light receiving element corresponding to the designated area is provided. Control means for controlling the received light reception signal to be output from the dedicated light receiving element to the infrared communication receiving circuit and the visible light communication receiving circuit;
A visible light communication system.   In the transmission unit, an infrared light emitting element that emits infrared light is provided, and instead of modulating the intensity of visible light emitted from the light emitting element by the infrared light communication signal, the infrared light is emitted. 2. The visible light communication system according to claim 1, wherein the intensity of infrared light emitted from the light emitting element is modulated.   The light emitting element in the transmission unit is composed of a red light emitting element and a green / blue light emitting element, and the visible light emitted from the red light emitting element is intensity-modulated by the infrared light communication signal, and the visible light communication signal 2. The visible light communication system according to claim 1, wherein the visible light emitted from the green / blue light emitting element is intensity-modulated. The receiving unit is provided with a second light emitting element for sending an optical signal modulated by an instruction signal to the transmitting unit,
The transmitting unit is provided with second light receiving means for receiving an optical signal modulated by the instruction signal transmitted from the receiving section, and communication data corresponding to the instruction signal output from the second light receiving means. The visible light communication system according to claim 1, wherein the selected communication data is transmitted from the transmission unit to the reception unit via the infrared communication transmission circuit. Transmitting device that transmits visible light and infrared light modulated by the information to be distributed, and receiving the distributed information by receiving visible light or infrared light transmitted from the transmitting device, and displaying from the received information A visible light communication system comprising a receiving device that extracts and displays information necessary for
The transmitter is
Information for providing a service, comprising transmission means for repeatedly transmitting variable information using visible light and infrared light,
The receiving device is:
Receiving means for receiving variable information transmitted from the transmitting device and acquiring data set information for interpreting and displaying the received information through the Internet at the first use;
Storage means for storing profile information including transmission device information and reception time for each service access and usage service history;
From the information acquired by the receiving means, it extracts data to be displayed based on the profile information read from the storage means, and comprises a control means for displaying the extracted data on the display means,
A visible light communication system.

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