KR101999882B1 - Visible light communication method using display adaptive color and pattern types - Google Patents

Visible light communication method using display adaptive color and pattern types Download PDF

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Publication number
KR101999882B1
KR101999882B1 KR1020160002579A KR20160002579A KR101999882B1 KR 101999882 B1 KR101999882 B1 KR 101999882B1 KR 1020160002579 A KR1020160002579 A KR 1020160002579A KR 20160002579 A KR20160002579 A KR 20160002579A KR 101999882 B1 KR101999882 B1 KR 101999882B1
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South Korea
Prior art keywords
visible light
data
display
transmitting device
transmitting
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KR1020160002579A
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Korean (ko)
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KR20170083290A (en
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차재상
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서울과학기술대학교 산학협력단
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Priority to KR1020160002579A priority Critical patent/KR101999882B1/en
Priority to US15/740,327 priority patent/US10218440B2/en
Priority to PCT/KR2016/014391 priority patent/WO2017119619A1/en
Publication of KR20170083290A publication Critical patent/KR20170083290A/en
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Publication of KR101999882B1 publication Critical patent/KR101999882B1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/116—Visible light communication
    • G06K9/20—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

A visible light communication method capable of transmitting a large amount of information in a short period of time. The present invention relates to a communication method for transmitting a signal using a display color and a pattern of a display from a transmitting device having a display to a receiving device having a camera, (Hereinafter referred to as " transmission data ") through the display; And the receiving device receiving the visible light signal through the camera and extracting the transmission data. As such, the transmitting device can transmit a large amount of information in a short period of time by transmitting data using at least one of the color and the pattern of the visible light emitted from the display.

Description

TECHNICAL FIELD [0001] The present invention relates to a visible light communication method using a display color and a pattern of a display,

The present invention relates to a visible light communication method using a display, and more particularly, to a visible light communication method for transmitting visible light signals from a display device to a camera device to perform visible light communication.

Visible Light Communication (VLC), which is one of various wireless communication technologies, is a wireless communication method in which a signal is transmitted in a visible light having a wavelength of 380 to 780 nanometers and is continuously developed due to recent development of light emitting diode technology have. Particularly, such a visible light communication technology is applied to various types of displays such as various signage panels and light pipes that emit visible light in addition to lighting devices. For example, various information can be provided to a user having a visible light communication receiver through a display device included in a TV, a monitor, a smart device, or the like.

In addition, since the visible light communication requires a user to purchase a visible light communication receiver separately, it may be inconvenient for a general user to use.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a visible light communication method capable of transmitting a large amount of information in a short time using at least one of a color and a pattern of visible light emitted from a display .

A visible light communication method according to an embodiment of the present invention is a communication method for transmitting a signal from a transmitting device having a display to a receiving device having a camera, Outputting a visible light signal including data (hereinafter, referred to as 'transmission data') through the display; And the receiving device receiving the visible light signal through the camera and extracting the transmission data.

Wherein the step of outputting the visible light signal includes the steps of the transmitting device changing the transmission data to modulated data using a communication modulation technique; And the transmitting device including the modulated data in the visible light signal using at least one of hue and pattern and outputting the modulated data through the display.

The communication modulation scheme may be one of an SS-CSK (Spread Spectrum Color Shift Keying) scheme, a Scalable Color Amplitude Modulation (SCAM) scheme, and an SS-SCAM (Spread Spectrum Scalable Color Amplitude Modulation) scheme.

Wherein the step of extracting the transmission data comprises the steps of the receiving device receiving the visible light signal through the camera and extracting the modulation data; And the receiving device may change the modulation data to the transmission data using a demodulation method corresponding to the communication modulation technique.

Wherein the step of including the modulated data in the visible light signal and outputting the modulated data through the display comprises: the transmitting device dividing the screen of the display into a plurality of areas; Dividing the modulated data so that the transmitting device corresponds to the areas; And the transmitting device outputting the divided visible light signals including each of the divided data through the areas using at least one of a hue and a pattern.

Wherein the step of the transmitting device dividing the screen of the display into a plurality of areas includes the steps of the transmitting device detecting a separation distance from the receiving device; And dividing the modulation data so that the transmission device corresponds to a number of areas determined according to the separation distance.

In the step of the transmitting device dividing the screen of the display into a plurality of areas, the number and arrangement of the divided areas may be determined according to the size and type of the screen of the display.

Wherein when the transmitting device outputs the visible light signal using the pattern, the modulating data is converted into the visible light by using the color and size of the pattern, Signal and output it through the display. At this time, the pattern may have a shape of a circle, a square, a rectangle, an ellipse, a triangle, or a star.

In the step of including the modulated data in the visible light signal and outputting the visible light signal through the display, the transmitting device may divide the visible light signal into a plurality of frames per second (fps) and output the visible light signal.

The transmitting device includes the modulated data in the visible light signal using a type symbol such as the color and size of the app icon, and outputs the modulated data to the display device through the display, in the step of including the modulated data in the visible light signal and outputting the modulated data through the display. can do.

The transmitting device may be any one of a device having a display such as a smart phone, a smart watch, a tablet PC, a monitor, a TV, a signage, and a display board.

The receiving device may be one of devices connected to a camera device such as a smart phone, a smart watch, and a tablet PC.

As described above, according to the visible light communication method of the present invention, the transmitting device includes the visible light signal using at least one of the hues and patterns of the display and transmits the data to the receiving device, Data can be transmitted more quickly. Particularly, it is possible to use both the color and the size of the pattern, to transmit the visible light signal by dividing the screen of one display into a plurality of regions, to transmit a visible light signal, to a pattern of a plurality of displays formed by collecting a plurality of identical models or different models, , The transmitting device can transmit a larger amount of data quickly.

In addition, when the user has a receiving device having a camera, such as a smart phone, a smart pad, a smart watch, etc., the user can perform visible light communication without using the receiving device, The user can easily use the visible light communication without purchasing the display device.

1 is a conceptual diagram for explaining a visible light communication method according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating an example in which the display-based transmitting device of FIG. 1 divides a visible light signal using a color into a plurality of regions, transmits the divided light, and the receiving device receives the visible light signal.
FIG. 3 is a diagram illustrating a state in which a display screen of the transmitting device of FIG. 1 is divided into a plurality of areas.
4 is a diagram for explaining an example of a process of outputting a visible light signal through display by applying the SS-CSK modulation scheme to data to be transmitted by the transmitting device of FIG.
5 is a diagram for explaining an example of a process in which a transmission device of FIG. 1 applies a SCAM technique to data to be transmitted and outputs a visible light signal through a display.
6 is a diagram for explaining an example of a process of outputting a visible light signal through display by applying the SS-SCAM technique to data to be transmitted by the transmitting device of FIG.
7 is a diagram illustrating an example of a process in which the receiving device of FIG. 1 receives a visible light signal and extracts data.
FIG. 8 is a diagram illustrating an example in which the transmission device of FIG. 1 senses a separation distance from the reception device and changes the number of areas displayed according to the separation distance.
9 is a diagram illustrating an example of transmitting data according to a change in color and a pattern size displayed in the transmitting device of FIG.
Fig. 10 is a diagram showing an example for explaining another pattern of the pattern of Fig. 9. Fig.
FIG. 11 is a diagram showing an example in which patterns are displayed according to the distance between the transmission device and the receiving device along with the size of the pattern of FIG. 9. FIG.
FIG. 12 is a diagram for explaining the arrangement of regions according to the size and shape of the display screen of the transmitting device of FIG. 1;
13 is a diagram showing an example of transmission of a visible light signal at a plurality of frames per second in the transmitting device of FIG.
FIG. 14 is a diagram illustrating an example of transmitting data by a color change of an application icon displayed in the transmitting device of FIG. 1;
FIG. 15 is a view illustrating an embodiment in which the angles and distances of distances according to the position of the camera can be freely determined in a communication process between the display and the camera.
FIG. 16 is a diagram showing an example of performing access authentication by a color / pattern combination displayed on the transmitting device of FIG. 1; FIG.

The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text.

It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprising" or "having ", and the like, are intended to specify the presence of stated features, integers, steps, operations, elements, parts, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, or combinations thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

1 is a conceptual diagram for explaining a visible light communication method according to an embodiment of the present invention.

Referring to FIG. 1, a visible light communication method according to an embodiment of the present invention relates to a communication method of transmitting a visible light signal from a transmitting device 100 having a display to a receiving device 200 having a camera.

Here, the transmitting device 100 may be any one of a smart phone, a smart pad, a smart watch, a tablet PC, a monitor, and a TV. Also, the receiving device 200 may be any of a smart phone, a smart pad, a smart watch, and a tablet PC as a digital device having the camera.

FIG. 2 is a diagram illustrating an example in which the display-based transmitting device of FIG. 1 divides a visible light signal using a color into a plurality of regions, transmits the divided light, and the receiving device receives the visible light signal.

Referring to FIG. 2, in the visible light communication method according to the present embodiment, the transmitting device 100 transmits visible light signals (hereinafter referred to as " transmission data " Can be output through the display. The transmitting device 100 shown in FIG. 2 may be, for example, a smartphone.

Then, the receiving device 200 can receive the visible light signal output from the transmitting device through the camera and extract the transmission data. At this time, the receiving device 200 shown in FIG. 2 may be, for example, a smart phone.

FIG. 3 is a diagram showing a state in which the display screen of the transmitting device of FIG. 1 is divided into a plurality of areas, FIG. 4 is a diagram illustrating a state in which the transmission device of FIG. 1 displays data to be transmitted by applying the SS- FIG. 5 is a diagram illustrating an example of a process of outputting a visible light signal through a display by applying a SCAM technique to data to be transmitted by the transmitting device of FIG. 1 FIG. 6 is a view for explaining an example of a process of outputting a visible light signal through display by applying the SS-SCAM technique to data to be transmitted by the transmitting device of FIG. 1, Receiving a visible light signal and extracting data. Fig.

3 to 7, the transmission device 100 outputs the visible light signal. First, the transmission device 100 can change the transmission data into modulation data using a communication modulation technique And then the transmitting device 100 may include the modulated data in the visible light signal using at least one of hue and pattern, and output the modulated data through the display. The communication modulation scheme may be any one of an SS-CSK (Spread Spectrum Color Shift Keying) scheme, a SCAM (Scalable Color Amplitude Modulation) scheme, and an SS-SCAM (Spread Spectrum Scalable Color Amplitude Modulation) scheme .

On the other hand, SS-CSK (SPREAD SPECTRUM COLOR SHIFT KEY), SCAM (SCALABLE COLOR AMPLITUDE MODULATION) and SS-SCAM (SPREAD SPECTRUM SCALABLE COLOR AMPLITUDE MODULATION) are one of effective modulation schemes for display based VLC systems. It is an asynchronous communication method with high data rate and error-resistant characteristics, and has a characteristic of being strong against color interference as compared with a single color.

CS-CSK (SPREAD SPECTRUM COLOR SHIFT KEY) can be used to increase the data rate by increasing the number of symbols per bit and CS (Spread Spectrum) It can be an asynchronous communication method having a higher data rate and error-resistant characteristics than the conventional method. SCAM (SCALABLE COLOR AMPLITUDE MODULATION) is a CSK-based modulation scheme called variable color amplitude modulation to improve distance and angle with high bit rate, and for display-based VLC systems with improved VLC throughput with increased symbol rate per bit Modulation scheme. SS-SCAM (SPREAD SPECTRUM SCALABLE COLOR AMPLITUDE MODULATION) and CSK (Color Shift Keying) are CSK-based modulation schemes called variable color amplitude modulation to improve distance and angle with high bit rate and improve the symbol rate per bit SS (Spread Spectrum) is a technique for eliminating indirect signal of SS signal. In order to have robustness against interference error, CSK and Spread Spectrum technology called SCAM can be proposed.

The receiving device 200 extracts the modulated data by receiving the visible light signal through the camera. The receiving device 200 then extracts the modulated data, The device 200 may change the modulation data to the transmission data using a demodulation method corresponding to the communication modulation technique. In this case, the demodulation method corresponding to the communication modulation technique may be one of SS-CSK demodulation (Scramble Color Shift Keying Demodulation), SCAM demodulation (Scramble Color Amplitude Demodulation), SS-SCAM demodulation (Spread Spectrum Scalable Color Amplitude Demodulation) It can be either.

In the present exemplary embodiment, the transmitting device 100 includes the modulated data in the visible light signal and outputs the modulated data through the display, so that the transmitting device 100 divides the screen of the display into a plurality of areas . At this time, the areas may be arranged in a matrix form corresponding to the screen of the display. Thereafter, the transmitting device 100 may divide the modulated data so as to correspond to the areas. Then, the transmitting device 100 may output the divided visible light signals including each of the divided data through the areas using at least one of the hue and the pattern.

FIG. 8 is a diagram illustrating an example in which the transmission device of FIG. 1 senses a separation distance from the reception device and changes the number of areas displayed according to the separation distance.

Referring to FIG. 8, the transmitting device 100 may divide the screen of the display into a plurality of areas, and the distance between the transmitting device 100 and the receiving device 200 may be detected . That is, the transmitting device 100 may include a sensing sensor capable of measuring a separation distance from the receiving device 200, and the transmitting device 100 may use a sensor 200) of the vehicle.

Thereafter, the transmitting device 100 may divide the modulated data so as to correspond to the number of areas determined according to the spacing distance. For example, when the separation distance exceeds the first reference distance, the transmission device 100 may transmit data through color change by utilizing the screen of the display as one area. On the other hand, if the separation distance exceeds the first reference distance and is greater than the second reference distance, the transmission device 100 divides the screen of the display into four areas (2 * 2) Data can be transmitted through the network. If the spacing distance is greater than or equal to the second reference distance, the transmitting device 100 divides the screen of the display into 16 areas (4 * 4), and changes the color Data can be transmitted through the network. When the distance exceeds the fourth reference distance, the transmitting device 100 divides the screen of the display into 64 areas (8x8), and changes the color Data can be transmitted through the network. As described above, the transmitting device 100 can transmit data through a color change while dividing the screen of the display into a larger size as the spacing distance decreases. Meanwhile, when the transmitting device 100 transmits data by changing the color using the screen of the display as one area, it is possible to increase the data transmission rate by further adding a change in blinking.

FIG. 9 is a diagram illustrating an example of transmission of data according to a color change and a pattern size displayed in the transmitting device of FIG. 1, and FIG. 10 illustrates an example for explaining another pattern of the pattern of FIG. 9 11 is a view showing an example in which patterns are displayed according to the distance between the transmission device and the receiving device together with the size of the pattern of FIG.

9, 10 and 11, in the process of including the modulated data in the visible light signal and outputting the visible light signal through the display, when the transmitting device 100 outputs the visible light signal using a pattern, The modulated data may be included in the visible light signal using the color and size of the pattern and output through the display. For example, the transmission device 100 may transmit data by changing the color as well as the circular color as shown in FIG. 9, thereby further improving the data transmission speed. At this time, the pattern may have various shapes such as a square, a rectangle, an ellipse, a triangle, and a star in addition to a circle.

On the other hand, the pattern may be displayed within each of the regions divided on the screen of the display. Accordingly, as the distance between the transmission device 100 and the receiving device 200 decreases, the number of areas increases, and accordingly, the number of patterns that can be displayed at one time increases, Can be further increased.

FIG. 12 is a diagram for explaining the arrangement of regions according to the size and shape of the display screen of the transmitting device of FIG. 1;

Referring to FIG. 12, in the process of the transmitting device 100 dividing the screen of the display into a plurality of areas, the number and arrangement of areas divided according to the size and type of the screen of the display can be determined. For example, when the display is a general display, sixteen areas are arranged in four rows and four columns, while when the display is a wide display, twenty four areas may be arranged in four rows and six columns. That is, the number of the areas can be increased as much as the width size is expanded.

13 is a diagram showing an example of transmission of a visible light signal at a plurality of frames per second in the transmitting device of FIG.

13, in the step of including the modulated data in the visible light signal and outputting the visible light signal through the display, the transmitting device 100 divides the visible light signal into a plurality of frames per second (fps) And output it. For example, the transmitting device 100 may divide each area of the display into two and output images at different frames per second. Accordingly, the visible light signal can be selectively received according to the performance of the camera of the receiving device 200.

FIG. 14 is a diagram illustrating an example of transmitting data by a color change of an application icon displayed in the transmitting device of FIG. 1;

14, in the step of including the modulated data in the visible light signal and outputting the modulated data through the display, the transmitting device 100 includes the modulated data in the visible light signal using the color of the app icon, Can be output through the display. That is, when the transmitting device 100 is a smart phone or a tablet PC, it is possible to transmit data to be transmitted by changing the color of the application icon displayed on the display.

FIG. 15 is a view illustrating an embodiment in which the angles and distances of distances according to the position of the camera can be freely determined in a communication process between the display and the camera.

Referring to FIG. 15, it is possible to easily extract the transmission data by receiving the visible light signal emitted from the transmission device 100, regardless of the position at which the reception device 200 performs imaging.

FIG. 16 is a diagram showing an example of performing access authentication by a color / pattern combination displayed on the transmitting device of FIG. 1; FIG.

16, access authentication is performed by a color / pattern combination displayed on a transmitting device (smart phone, smart pad, smart watch, etc.). In this case, unlike the RF myth, it has a strong security aspect because there are no radiated signals around it.

As described above, according to the present embodiment, the transmitting device 100 includes the visible light signal using at least one of hue and pattern, and transmits the data to the receiving device 200, so that the transmitting device 100 ) Can transfer large amounts of data faster. Particularly, when the display screen is divided into a plurality of regions and a visible light signal is transmitted using both the color and the size of the pattern, the transmitting device 100 can transmit a larger amount of data quickly.

In addition, when the user has the receiving device 200 having the camera, for example, a smart phone, a smart pad, a smart watch, etc., the user can perform visible light communication using the same, It is possible to easily use visible light communication without purchasing a visible light communication receiver of the present invention.

While the present invention has been described in connection with what is presently considered to be practical and exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: transmitting device 200: receiving device

Claims (13)

A visible light communication method for transmitting a signal from a transmitting device having a display to a receiving device having a camera,
The transmitting device modifying data for transmission (hereinafter, referred to as 'transmission data') into modulation data using a communication modulation technique;
Detecting a distance between the transmitting device and the receiving device;
The transmitting device dividing a screen of the display into a number of areas determined according to the spacing distance;
Dividing the modulated data so as to correspond to the area and generating the divided data, respectively;
The transmitting device outputting a divided visible light signal including the divided data through each of the regions using at least one of a color and a pattern; And
And the receiving device receiving the divided visible light signals through the camera and extracting the transmission data. delete 2. The method of claim 1,
Wherein the method is one of a spread spectrum color shift keying (SS-CSK) modulation scheme, a scalable color amplitude modulation (SCAM) scheme and a spread spectrum scalable color amplitude modulation (SS-SCAM) scheme. The method of claim 1, wherein extracting the transmission data comprises:
The receiving device receiving the divided visible light signals through the camera and extracting the modulated data; And
And the receiving device modifying the modulated data into the transmission data using a demodulation method corresponding to the communication modulation technique. delete delete delete A visible light communication method for transmitting a signal from a transmitting device having a display to a receiving device having a camera,
The transmitting device modifying data for transmission (hereinafter, referred to as 'transmission data') into modulation data using a communication modulation technique;
The transmitting device including the modulated data in a visible light signal using a pattern having the same shape but different sizes and outputting the modulated data through the display; And
And the receiving device receives the visible light signal through the camera and extracts the transmission data. 9. The method of claim 8,
Wherein each of the plurality of light-receiving portions has a shape of a circle, a square, a rectangle, an ellipse, a triangle, and a star. delete delete 2. The method of claim 1,
A smart phone, a smart watch, a tablet PC, a monitor, a TV, and a display board. 2. The apparatus of claim 1, wherein the receiving device
Wherein the display device is one of a smart phone, a smart watch, a smart pad, and a tablet PC.
KR1020160002579A 2016-01-08 2016-01-08 Visible light communication method using display adaptive color and pattern types KR101999882B1 (en)

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KR1020160002579A KR101999882B1 (en) 2016-01-08 2016-01-08 Visible light communication method using display adaptive color and pattern types
US15/740,327 US10218440B2 (en) 2016-01-08 2016-12-08 Method for visible light communication using display colors and pattern types of display
PCT/KR2016/014391 WO2017119619A1 (en) 2016-01-08 2016-12-08 A method for visible light communication using display colors and pattern types of display

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