WO2007049404A1 - Procede, systeme et dispositif de communication - Google Patents

Procede, systeme et dispositif de communication Download PDF

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Publication number
WO2007049404A1
WO2007049404A1 PCT/JP2006/318119 JP2006318119W WO2007049404A1 WO 2007049404 A1 WO2007049404 A1 WO 2007049404A1 JP 2006318119 W JP2006318119 W JP 2006318119W WO 2007049404 A1 WO2007049404 A1 WO 2007049404A1
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WO
WIPO (PCT)
Prior art keywords
communication
information
image corresponding
light
display unit
Prior art date
Application number
PCT/JP2006/318119
Other languages
English (en)
Japanese (ja)
Inventor
Yasuyuki Irie
Original Assignee
Kyocera Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyocera Corporation filed Critical Kyocera Corporation
Publication of WO2007049404A1 publication Critical patent/WO2007049404A1/fr

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/34—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators for rolling or scrolling
    • G09G5/343—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators for rolling or scrolling for systems having a character code-mapped display memory
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133626—Illuminating devices providing two modes of illumination, e.g. day-night
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature

Definitions

  • the present invention relates to a communication device, a communication system, and a communication method, and more particularly to a technique for performing communication using visible light.
  • wireless communication using light and radio waves is used in various fields! Since such wireless communication does not require a cable as a data transmission path, for example, mutual communication between devices such as mobile devices, personal computers (PCs), PDAs (Personal Digital Assistants), and PCs. It is used in various communications such as communication with peripheral devices such as printers and displays (see, for example, Patent Documents 1 and 2).
  • optical communication is expected to expand the range of use in the future because it is cheaper than radio communication systems and is not affected by electromagnetic radiation noise.
  • a transmitter generates a pulse signal sequence or the like in which light intensity such as infrared rays is changed, and a receiver analyzes a pulse signal.
  • a modulated signal by such light intensity modulation processing is often used.
  • Patent Document 1 JP-A-10-190584
  • Patent Document 2 JP 2004-72365 A
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a communication device, a communication system, and a communication method capable of optical communication with a high degree of freedom. There is.
  • the present invention relates to a display unit for displaying an image, content information image display control means for displaying an image corresponding to content information on the display unit in a first cycle, and content information to the display unit.
  • Communication information image display control means for causing the display unit to display an image corresponding to the communication information in the second period while the image to be displayed is not displayed.
  • the second period may be equal to or less than the first period.
  • the second period is 360 Hz or less.
  • the display unit includes a plurality of light emitting units corresponding to a plurality of colors, and the communication information image display control unit performs the plurality of the plurality of light emitting units according to the communication information. You can also control the light emission order of the light emitting parts.
  • communication information can be represented by the light emission order of the plurality of light emitting units.
  • the communication information image display control unit corresponds to the communication information on the display unit with the luminance of the image corresponding to the content information displayed on the display unit immediately before. Display the image you want to view.
  • the present invention provides a light receiving unit that receives light of an image corresponding to content information and light of an image corresponding to communication information, and light of an image corresponding to content information received by the light receiving unit.
  • Demodulating means for demodulating the communication information based on the light of the image corresponding to the communication information out of the light of the image corresponding to the communication information.
  • communication information can be obtained from light of an image corresponding to the communication information from the communication device described above.
  • the communication device of the present invention has communication quality deriving means for deriving communication quality based on light corresponding to the communication information, and the demodulation means is regarded as having good communication quality.
  • the communication information may be demodulated.
  • the communication device of the present invention may have a notification means for notifying the communication quality.
  • the user of the communication device can recognize the communication quality.
  • the present invention is a communication system including a communication device that displays an image corresponding to the communication information described above and a communication device that receives light of an image corresponding to the communication information.
  • the present invention is a communication method in a communication apparatus having a display unit for displaying an image, and a content information image display control for displaying an image corresponding to content information on the display unit in a first cycle. And a communication information image display control step of causing the display unit to display an image corresponding to the communication information in a second period while an image corresponding to the content information is not displayed on the display unit.
  • FIG. 1 is a diagram showing a configuration of a liquid crystal display as a transmitter.
  • FIG. 2 is a diagram showing a configuration of a part for controlling an RGB filter in a liquid crystal display.
  • FIG. 3 is a diagram showing two pixels corresponding to an RGB filter of a display unit in a liquid crystal display as a transmitter.
  • FIG. 4 is a diagram showing an example of transition of the light emission state of a pixel corresponding to communication information “0”.
  • FIG. 5 is a diagram showing an example of transition of the light emission state of a pixel corresponding to communication information “1”.
  • FIG. 6 is a diagram showing an example of transition of the light emission state of a pixel corresponding to communication information “00”.
  • FIG. 7 is an example of an image displayed on a display unit in a liquid crystal display.
  • FIG. 8 is a diagram showing an example of transition of the light emission state of a pixel corresponding to communication information “11”.
  • FIG. 9 is a diagram showing an operation during communication of the liquid crystal display.
  • FIG. 10 is a diagram showing an operation of the liquid crystal display during non-communication.
  • FIG. 11 is a diagram showing a configuration of a receiver.
  • FIG. 12 is a flowchart showing an operation at the time of reception by the receiver.
  • FIG. 13 is a flowchart showing the screen transition operation of the display unit in the receiver.
  • FIG. 14 is a diagram showing screen transition of the display unit in the receiver.
  • FIG. 15 is a diagram showing a correspondence relationship between the communication quality of visible light communication, the state of the display unit in the receiver, and the image displayed on the display unit.
  • FIG. 16 is a diagram illustrating an example of communication quality of visible light communication.
  • FIG. 17 is a diagram showing an example of image display on the display unit when the receiver is a mobile terminal.
  • FIG. 1 is a diagram showing a configuration of a liquid crystal display which is a transmitter for visible light communication according to the present embodiment.
  • This liquid crystal display is composed of backlight unit 1, polarizing film 2, TF It comprises a T substrate 3, an RGB filter 4, a content light emission control unit 5, a communication light emission control unit 6, a display communication control unit 7, a communication information storage unit 8, and a content information storage unit 9.
  • a display unit comprising a backlight unit 1, a polarizing film 2, a TFT substrate 3, and an RGB filter 4, a content light emission control unit 5, and a content information storage unit 9 are used for a normal liquid crystal display.
  • Visible light communication can be realized by arranging the communication light emission control unit 6 and the communication information storage unit 8.
  • the part other than the display unit is divided into two parts: an image-related part and a communication-related part.
  • a content information storage unit 9 which is a part related to an image stores content information.
  • the content light emission control unit 5 displays an image corresponding to the content information on the display unit based on the content information input from the content information storage unit 9.
  • the communication information storage unit 8 which is a part related to communication stores communication information.
  • the communication light emission control unit 6 controls the backlight unit 1 based on the communication information input from the communication information storage unit 8 and causes the display unit to display an image corresponding to the communication information.
  • the image corresponding to the communication information and the image corresponding to the content information are alternately displayed in time on the display unit.
  • the luminance of the image corresponding to the content information displayed on the display unit may or may not be reflected in the image corresponding to the communication information.
  • the communication information stored in the communication information storage unit 8 is input to the communication light emission control unit 6 and
  • the content information stored in the content information storage unit 9 is input to the communication light emission control unit 6 via the display communication control unit 7.
  • the communication light emission control unit 6 controls the backlight unit 1 based on the communication information and the content information, and causes the display unit to display an image corresponding to the communication information and the content.
  • the brightness of the image corresponding to the content information displayed on the display unit is an image for communication. If not reflected, only the communication information stored in the communication information storage unit 8 is input to the communication light emission control unit 6, and the communication light emission control unit 6 controls the backlight unit 1 with this communication information. Then, an image corresponding to the communication information is displayed on the display unit.
  • FIG. 2 is a diagram showing a configuration of a portion that controls the RGB filter 4 in the liquid crystal display.
  • the configuration of the control part is as follows: red LED 10, green LED 11, blue LED 12 in RGB filter 4, arithmetic unit 13, control unit 14, timing generator 15, and communication information storage unit 8 in communication light emission control unit 6. It is composed of.
  • the communication light emission control unit 6 inputs the communication information stored in the communication information storage unit 8 into the red LED 10, the green LED 11, and the blue LED 12. Then, the red LED 10, the green LED 11, and the blue LED 12 light up and blink according to the communication information sequence.
  • the RGB filter corresponding to each pixel thereof 4 emits light while maintaining the brightness of the image corresponding to the content information displayed at the previous time only the LED of the image color corresponding to the communication information.
  • FIG. 3 is a diagram showing two pixels corresponding to the RGB filter 4.
  • red (R), green (G), and blue (B) colors emit light with the same brightness, so that it appears white to the human eye.
  • the left pixel 1 is a high luminance pixel
  • the right pixel 2 is a low luminance pixel.
  • FIG. 4 is a diagram illustrating an example of transition of the light emission state of the pixel corresponding to the communication information “0”.
  • FIG. 5 is a diagram illustrating an example of transition of the light emission state of the pixel corresponding to the communication information “1”.
  • the communication light emission control unit 6 expresses “1” by emitting light in the order of red (R) and blue (B), and finally displays green (G). Correct color by emitting light
  • FIG. 6 is a diagram illustrating an example of transition of the light emission state of the pixel corresponding to the communication information “00”.
  • the light emission control unit for communication 6 corresponds to the communication information for the pixel at the odd-numbered timing. Does not emit light. For this reason, the pixel emits light corresponding to the content information. on the other hand
  • the communication light-emission control unit 6 causes the pixel to emit red (R) at the luminance 4 of the image corresponding to the content information at the second timing.
  • the communication light-emission control unit 6 causes the pixel to emit green (G) with the luminance 3 of the image corresponding to the content information.
  • the communication light emission control unit 6 causes the pixel to emit light in blue (B) at the luminance 3 of the image corresponding to the content information at the sixth timing.
  • red (R) emits light at the second timing
  • green (G) emits light at the fourth timing, so that “0” is expressed
  • FIG. 7 is an example of an image displayed on the display unit at timings 1 to 6 in FIG. As shown in FIG. 7, an image corresponding to the content information is displayed at the odd-numbered timing. On the other hand, the red (R) part of the image corresponding to the content information is displayed at the second timing, the green (G) part at the fourth timing, and the blue (B) part at the sixth timing.
  • the red (R) part of the image corresponding to the content information is displayed at the second timing, the green (G) part at the fourth timing, and the blue (B) part at the sixth timing.
  • the communication light emission control unit 6 causes the pixel to emit red (R) with the luminance 2 of the image corresponding to the content information.
  • the communication light emission control unit 6 causes the pixel to emit light in green (G) at the luminance 1 of the image corresponding to the content information at the tenth timing.
  • the communication light emission control unit 6 causes the pixel to emit light in blue (B) at the luminance 1 of the image corresponding to the content information at the 12th timing.
  • red (R) emits light at the 8th timing
  • green (G) emits light at the 10th timing
  • “0” is represented
  • blue (B) at the 12th timing Color correction is realized by emitting light.
  • FIG. 8 is a diagram illustrating an example of transition of the light emission state of the pixel corresponding to the communication information “11”.
  • the communication light-emission control unit 6 does not cause the pixels to emit light corresponding to the communication information at odd-numbered timings. For this reason, the pixel emits light corresponding to the content information.
  • the communication light emission control unit 6 causes the pixel to emit red (R) with the luminance 4 of the image corresponding to the content information.
  • the communication light emission control unit 6 causes the pixel to emit light in blue (B) with the luminance 3 of the image corresponding to the content information.
  • the communication light emission control unit 6 corresponds to the pixel content information at the sixth timing.
  • the communication light emission control unit 6 causes the pixel to emit red (R) at the luminance 2 of the image corresponding to the content information at the eighth timing.
  • the communication light-emission control unit 6 causes the pixel to emit blue (B) at the luminance 1 of the image corresponding to the content information at the tenth timing.
  • the communication light emission control unit 6 causes the pixel to emit green (G) at the luminance 1 of the image corresponding to the content information at the 12th timing.
  • red (R) emits light at the 8th timing
  • blue (B) emits light at the 10th timing, so that “1” is expressed, and green (G) at the 12th timing.
  • FIG. 9 is a diagram showing an operation during communication of a liquid crystal display as a transmitter.
  • the content light emission control unit 5 reads content information from the content information storage unit 9 (S1), and performs signal processing for image display corresponding to the content information (S2). Further, the content light emission control unit 5 displays an image corresponding to the content information on the display unit in accordance with the processed signal (S3).
  • the communication light emission control unit 6 reads the communication information from the communication information storage unit 8 and also reads the content information from the content information storage unit 9 (S4), and performs signal processing for image display corresponding to the communication information. Perform (S5).
  • the brightness of the image corresponding to the communication information is adjusted to be the brightness of the image corresponding to the content information.
  • the communication light emission control unit 6 causes the display unit to display an image corresponding to the communication information based on the processed signal (S6).
  • the VSYNC scanning frequency is preferably 360 [Hz], which is six times the normal frequency. Therefore, the time required for the operations of S1 to S6 described above is 0.0027 [Sec]. During this time, the flicker effect prevents the human eye from feeling flickering in brightness and chromaticity.
  • FIG. 10 is a diagram showing an operation of the liquid crystal display as a transmitter during non-communication.
  • non-communication only operations S101 to S103 corresponding to S1 to S3 in FIG. 9 are performed.
  • the time required for the operation of S101 to S103 is the VSYNC scanning frequency.
  • S60 [Hz], 0.166 [Sec] is preferable.
  • the flicker effect prevents the human eye from feeling any flickering in brightness or chromaticity.
  • FIG. 11 is a diagram showing a configuration of a visible light communication receiver according to the present embodiment.
  • This receiver includes an optical filter 17 that allows red light to pass through, an optical filter 18 that allows green light to pass, and an optical filter that allows blue light to pass, among light from the liquid crystal display as the transmitter described above.
  • An optical sensor 20 such as a CMOS sensor corresponding to these optical filters 17, a synchronization detection circuit 21, a determination unit 22, an SZN measurement unit 24, a calculation unit 25, a communication information storage unit 26, and a display Part 27.
  • FIG. 12 is a flowchart showing the receiving operation of the receiver.
  • Each optical sensor 20 receives light that has passed through the corresponding optical filter 17 and the like, detects the luminance of the light, and outputs a signal (luminance signal) corresponding to the luminance to the determination unit 22 (S21).
  • the synchronization detection circuit 21 is a luminance corresponding to the light of the image corresponding to the communication information.
  • the timing at which the signal reaches the determiner 22 is detected (S22).
  • the determination unit 22 detects a temporal difference in the luminance signal input from each optical sensor 20 at the timing detected by the synchronization detection circuit 21, and at a timing at which the temporal difference is eliminated, The luminance signal is output to the SZN measuring device 24 (S23).
  • the SZN measuring device 24 measures the communication quality (SZ N value) of visible light communication based on the input luminance signal, and outputs the luminance signal and the SZN value to the computing unit 25 (S24 ).
  • the computing unit 25 determines whether or not the input SZN value is greater than or equal to a predetermined value (S25). When the SZN value is equal to or greater than the predetermined value, the calculation unit 25 also demodulates the communication information with the input luminance signal power (S26). The demodulated communication information is stored in the communication information storage unit 26. On the other hand, when the SZN value is less than the predetermined value, the calculation unit 25 does not demodulate the communication information from the input luminance signal (S27).
  • FIG. 13 is a flowchart showing the screen transition operation in the display unit 27 of the receiver.
  • the display unit 27 displays the message “Recognized optical wireless communication signal. Do you want to capture information?” (See Fig. 14 (a)) (S31).
  • the calculation unit 25 determines whether or not the user has performed an information capturing operation (S32).
  • reception processing by the calculation unit 25 is started (S33).
  • the calculation unit 25 determines whether or not the reception sensitivity is poor, in other words, whether or not the input SZN value is less than a predetermined value (S34). If the reception sensitivity is good, the reception processing by the calculation unit 25 is continued (S35), and when the reception processing is completed, the display unit 25 displays “Information has been captured.” (See Fig. 14 (b)) (S36).
  • the display unit 25 determines whether or not an information capturing operation has been performed by the user (S38). If an information capturing operation has been performed, the operations after S31 are repeated.
  • FIG. 15 is a diagram illustrating a correspondence relationship between the communication quality of visible light communication, the state of the display unit 27, and the image displayed on the display unit 27.
  • FIG. 16 is a diagram illustrating an example of communication quality of visible light communication.
  • the display unit 27 When the communication quality of visible light communication based on the SZN value is good, the display unit 27 is always bright and displays a sign indicating that it is good.
  • the communication quality of visible light communication is good when the brightness of red (R), green (G), and blue (B) is stable at a predetermined value or more, as shown in Fig. 16 (a). Indicates. In this case, the receiver can receive communication information stably.
  • the display unit 27 displays a sign indicating that the transition between light and dark becomes intense and unstable. Visible light communication quality is unstable when the ratio of the luminance of red (R), green (G), and blue (B) changes over time as shown in Fig. 16 (b).
  • the receiver may stop receiving communication information on the way.
  • the display unit 27 is always dark and displays a sign indicating that it is defective. Visible light communication quality is poor, as shown in Fig. 16 (c), although the red (R), green (G), and blue (B) brightness is stable. Indicates a case where it is not sufficient. In this case, the receiver may stop receiving communication information on the way.
  • FIG. 17 is a diagram illustrating an example of image display on the display unit 27 when the receiver is a portable terminal.
  • FIG. 17A illustrates a case where the communication quality of visible light communication is good. 17 (b) is visible When the communication quality of optical communication is unstable, Fig. 17 (c) shows the case where the communication quality of visible light communication is poor.
  • the display unit 27 can display not only the communication quality of mobile phone communication but also the communication quality of visible light communication based on the SZN value. Thereby, the user can grasp the communication quality of visible light communication.
  • the image corresponding to the content and the image corresponding to the communication information are alternately displayed on the display unit of the liquid crystal display which is the transmitter, thereby corresponding to the content information.
  • Optical communication with a high degree of freedom without being affected by the image to be transmitted becomes possible.
  • an image corresponding to the communication information is included by the person viewing the image corresponding to the content information. Can be difficult to recognize.
  • the communication device, the communication system, and the communication method according to the present invention are capable of highly flexible communication and are useful as communication devices and the like.

Abstract

La présente invention concerne un procédé, un système et un dispositif de communication rendant possible des communications optiques ayant un niveau élevé de liberté. Un affichage à cristaux liquides agissant à titre de transmetteur se compose comme suit : une section d’affichage composée d’une unité de rétroéclairage (1) permettant d’afficher une image, un film de polarisation (2), un substrat TFT (3) et un filtre RGB (4) ; une section de commande d’émission (5) pour les contenus, en vue de permettre à la section d‘affichage d’afficher une image correspondant à l’information de contenus dans un premier cycle ; et une section de commande d’émission (6) destinée à la communication pour permettre à la section d‘affichage d’afficher une image correspondant à l’information de contenus dans un second cycle, pendant que l’image correspondant à l’information de contenu n’est pas affichée sur la section d’affichage.
PCT/JP2006/318119 2005-10-28 2006-09-13 Procede, systeme et dispositif de communication WO2007049404A1 (fr)

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JP2005-315438 2005-10-28
JP2005315438A JP4739914B2 (ja) 2005-10-28 2005-10-28 通信装置、通信システム及び通信方法

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