KR100551237B1 - A communication system of portable communication terminal using blinking signal of display panel and a method thereof - Google Patents

Abstract

The present invention relates to a communication apparatus and method of a portable communication terminal, and more particularly, to a communication apparatus and method using a flashing interval of the display unit of the portable communication terminal.

Recently, with the rapid development of information and communication technology, payment methods using portable communication terminals are also diversifying. As is well known, a payment technology using a conventional portable communication terminal includes a method of transmitting a message to a payment certificate server, a method of making a call, a method of accessing a wireless Internet, etc., but the user has a portable communication terminal. All of these were inconvenient for the user to operate the keypad of the communication terminal several times, and the method of making a small payment through a wireless signal transmitted by a non-contact method is a separate method for reading a signal such as an RF signal or an infrared ray or a barcode. A device is needed, and because the price is too high such as hundreds of thousands of dollars per one, the cost of building a market infrastructure for a reader or a company is too high. Therefore, the basis of payment using a portable communication terminal is It was not activated.

Accordingly, the present invention provides a communication apparatus and method of a portable communication terminal that can be driven simply by a program without adding a separate device to solve the above problems. In addition, the present invention provides a communication apparatus and method of a portable communication terminal that can ensure reliability against external noise and communication errors.

Portable, Communication Terminal, Display, Backlight, Blinking, Color, Communication, Payment, Optical Noise

Description

Communication apparatus and method using flashing interval of display part of portable communication terminal {A COMMUNICATION SYSTEM OF PORTABLE COMMUNICATION TERMINAL USING BLINKING SIGNAL OF DISPLAY PANEL AND A METHOD THEREOF}

1 is a block diagram of a communication device according to the present invention

2 is a communication example using a blinking interval of the display unit of the portable communication terminal according to the present invention

3 is a detailed configuration diagram of the light receiving unit according to the present invention

4A, 4B, and 4C are experimental waveforms of the light receiving unit according to the present invention.

5 and 6 are flowcharts of execution of the control software according to the present invention.
* Explanation of symbols for the main parts of the drawings
100: portable communication terminal 110: control unit
120: memory unit 130: display unit
200: light receiving unit 210: light receiving sensor
220: optical / electric signal converter 221: optical / electric signal converter
222: amplifier 223: analog filter
224: change rate detector 225: hysteresis comparator
226: A / D converter 227: digital filter
230: control unit 231: microprocessor
232: communication unit

The present invention relates to a communication apparatus and method of a portable communication terminal, and more particularly, to a communication apparatus and method using a flashing interval of the display unit of the portable communication terminal.

As the economy grows rapidly, trading of goods and services becomes very active, and the payment methods are diversified. Recently, various payments using portable communication terminals such as cellular phones, PCS, PDAs, etc. A payment method is proposed.

As is well known, the conventional payment technology using a portable communication terminal has been divided into a method of transmitting a message to a payment authentication server, a call, a method of accessing the wireless Internet, etc. All have been inconvenient, accompanied by the operation of the portable communication terminal by the user until a small payment is made. That is, in the case of the above method, when the user requests a small payment to the payment authentication server through the portable communication terminal, the payment authentication server requests authentication data necessary for the payment to the user's portable communication terminal. Inconvenient to operate the keypad of the portable communication terminal several times.

This led to the development of a system in which a small amount of payment is made through a wireless signal transmitted by a contactless method. In such a system, an RF chip (IC) having authentication data associated with a credit card company as well as a transmission port in a portable communication terminal is developed. Or smart card type) or infrared module.

However, the conventional receiving unit that reads a signal transmitted from an RF chip or an infrared module in the portable communication terminal, that is, a reader (for example, RF, infrared, bar code, etc.) is too expensive such that the price is one hundred thousand won per one. The cost of constructing the market infrastructure was too high, and the basis of payment using a portable communication terminal was not activated.

In addition, in the above case, in order to make a small payment, the user must purchase a built-in portable communication terminal with an RF chip or an infrared module, and in the case of a portable communication terminal that is not an embedded RF chip or an infrared module, the outside of the portable communication terminal is required. There was an inconvenience in operating the RF chip or an infrared module separately, and thus the utilization of the system was determined to be extremely low.

Accordingly, the present invention is to solve the above problems, an object of the present invention is to provide a communication device and method of a portable communication terminal that can be driven simply by a program without adding a separate device.

It is also an object of the present invention to provide a communication apparatus and method for a portable communication terminal having robust characteristics against external noise.

It is also an object of the present invention to provide an apparatus and method for minimizing malfunctions that may occur in performing a function of an apparatus by applying a code having an error correction function to the communication apparatus and method.

Communication apparatus using a flashing interval of the display unit of the portable communication terminal according to the present invention for achieving the above object is a light receiving unit consisting of a control unit, a memory unit, a portable communication terminal having a display unit and a light receiving sensor, a signal conversion unit, a control unit. In the configured communication device, the portable communication terminal flashes the display unit or changes the color, or flashes the backlight of the display unit (hereinafter, referred to as the above three cases, referred to as "flashing of the display unit"). And transmit the information, and the light receiving unit detects the change of the light transmitted from the display unit and receives the information.

A communication method using a flashing interval of a display unit of a portable communication terminal according to the present invention for achieving the above object is a control software for controlling the blinking of the display unit in a communication method using a portable communication terminal having a control unit, a memory unit, and a display unit. A first step of loading the memory into a memory of the portable communication terminal; A second step of processing information to be transmitted by the portable communication terminal when there is a transmission request, and performing a normal basic function when there is no transmission request; And a third step of controlling and blinking the display unit according to the information processed in the second step.

In addition, the communication method using the flashing interval of the display unit of the portable communication terminal according to the present invention for achieving the above object is a portable communication terminal having a control unit, a memory unit, a display unit and a light receiving sensor, a signal conversion unit, a control unit A communication method using a bride, comprising: a first step of loading control software for flashing the display unit into a memory of the portable communication terminal; A second step of processing information to be transmitted by the portable communication terminal when there is a transmission request, and performing a normal basic function when there is no transmission request; A third step of controlling and blinking the display unit according to the information processed in the second step; A fourth step of detecting, by the light receiving sensor, a change in the optical signal of the display unit; A fifth step of converting the optical signal into a digital signal; And a sixth step of decoding information from the digital signal and transmitting the information to the outside.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

Generally, portable communication terminals (hereinafter referred to as "portable communication terminals"), such as mobile phones, cellular phones, PDAs, PCS, CDMA-2000, and IMT-2000, are made of LEDs, LCDs, organic ELs, and plasma displays. The display unit has been mainly used only for passively displaying text or image (still image or moving image) information received through a wireless communication network, and is actively used to transmit information by controlling the display unit. No attempt has been made so far.

Accordingly, an aspect of the present invention is to provide a communication apparatus and method capable of transmitting information by actively controlling a display unit of a portable communication terminal using control software mounted in a mobile phone.

1 is a block diagram showing the configuration of a communication apparatus according to the present invention. As shown in FIG. 1, the communication apparatus according to the present invention includes a portable communication terminal 100 for transmitting an optical signal and an optical receiver 200 for recognizing an optical signal transmitted from the portable communication terminal.
The portable communication terminal 100 may further include a control unit 110 for controlling the terminal, a memory unit 120 for storing programs and data, and a display unit for displaying a character or an image (still image or moving image) by the control unit ( 130).

For reference, Korean Patent Laid-Open Publication No. 2001-79211 ("Authentication and Payment System Using a Cellphone Barcode") downloads application software from a server operated by a corresponding operator such as an additional function of a mobile phone, ie, karaoke function, coloring, or avatar. It is a payment method using a function of receiving and executing. In the above method, when a customer receives a product discount or purchases an item on the Internet and wants to authenticate the payment for the product, a barcode generator for the mobile phone is performed on the mobile phone's WAP Browser Service. Displaying a bar code on the display unit of the mobile phone using the, and reads it to a bar code reader of a company equipped with an offline bar code system to perform payment authentication.

Here, a bar code is an optically readable encoding of letters, numbers, or special symbols by a combination of thick or thin bars (black bars) and spaces (white bars). Enable detoxification. The bar code is a sequence of specific black and white spaces representing letters or numbers, which are converted into bits of binary 0s and 1s, which are combined and used as information, which is defined by the rules defined by the bar code language called symbology. Is made. In other words, a bar code is a language composed of 0 and 1 bits, which are the basics of computer internal logic, and there are various types of code systems depending on the ratio of the thickness of the bar to the width of the space. The printed code causes the barcode recognition device to reproduce the data using the reflection of light and collect and transmit the reproduced data.

However, the present invention is simply performed by flashing the display unit of the portable communication terminal, without displaying the information by the barcode or the device for reading the barcode as in the above example. In other words, the present invention displays information by shortening or lengthening the blinking interval of the display unit. For example, when it is desired to display data "0" of binary numbers, the blinking interval of the display unit is shortened, and data "1" is displayed. When displaying, information can be displayed by making a blinking interval longer than "0". Of course, if necessary, the opposite is also possible.

Figure 2 shows an example of displaying information by using the flashing of the display unit, for example, if you want to display the decimal number 10 as a 4-bit code using the flashing of the display unit, and a short flashing interval is set to "0", the period If the long is " 1 ", this controls the blinking of the display unit in the form of [short (A)-> long (B)-> short (A)-long (B)] as shown in FIG. This way, you can display all the information you want.

On the other hand, the control of the ON / OFF time for the display unit flickering may shorten the on time and lengthen the off time as shown in Figure 2a, as shown in Figure 2b to lengthen the on time and shorten the off time You may.

In the above example, the information is displayed by using the blinking interval of the display unit, but the same applies to the case of displaying by using the blinking color of the display unit or the blinking of the backlight. In the above example, the interval ratio between "A" and "B" may be any ratio depending on the performance of the flashing device, etc., but considering the overall information transmission speed, the ratio of 1: 2 to 1:20 is required. desirable.

Next, the light receiving unit 200 will be described.

As shown in FIG. 1, the light receiving unit 200 includes a light receiving sensor 210, a signal converter 220, and a controller 230. First, the light receiving sensor 210 of the display attached to the portable communication terminal. It detects flickering or color change. The light receiving sensor 210 may be an element capable of detecting an optical signal such as a photo transistor or a CdS, but it is preferable to use an element that is sensitive to an optical signal without being affected by an infrared signal. Do.
The detected optical signal should be converted into an electrical signal that can be applied to an electric circuit. The signal converter 220 serves to finally convert the received optical signal into a digital signal. Next, the digitized electric signal is transmitted to the control unit 230, and the control unit 230 recognizes the signal as one information according to a predetermined rule, passes through a predetermined operation, and transmits the signal to an external device or the Internet. do.

On the other hand, the light receiving unit 200 can receive the light even when the display unit 130 is separated from the light receiving sensor 210 to a certain distance, in order to effectively detect the optical signal according to the flashing of the display unit 130 It is preferable to bring the unit 130 closer to the light receiving unit 200, and the outer portion surrounding the light receiving sensor 210 (not shown) is a light receiving sensor in order to minimize interference caused by other external light noise when approaching. It is desirable to be constructed higher.

However, despite the structure and method described above, the possibility of malfunction due to interference or shadow due to various external lights or the like (hereinafter referred to as "light noise") remains in the light receiving unit 200. Accordingly, in order to prepare for such a case, an apparatus and a method for eliminating a malfunction even when the above-mentioned optical noise occurs will be described.

3 is a block diagram illustrating the configuration of the light receiver 200 in more detail, and FIG. 4 is an experimental waveform in which signals of the light receivers are measured.

First, the operation of the light receiving unit 200 according to the present invention will be described with reference to FIG. 4A in the case where there is no optical noise from the outside. 4A shows an output waveform of the light receiving sensor 210. If there is no noise from the outside, a signal obtained through the light receiving sensor 210 is obtained without a noise mixed. The signal is converted into a signal that can be used in an electric circuit by the optical / electrical signal converter 221 and then passes through the change rate detector 224 through the amplifier 222 and the filter 223. The waveform of FIG. (B) is a waveform of measuring the output signal of the change rate detector 224.

On the other hand, even though the display 130 is blinking in the form as shown in FIG. 2, the reason why the output of the light receiving sensor 210 is obtained as waveform (a) is due to the afterimage effect of the display unit and the response speed of the light receiving unit. Will follow. Therefore, in order to clearly distinguish the waveform whose signal level is not clear as described above, the present invention amplifies the signal using the amplifier 222, and removes the noise component amplified in the amplifier together with the main signal. 223). In addition, since the output of the filter 223 is not only an analog signal but also a signal that is not yet suitable for changing into a digital signal, in the present invention, a change rate composed of a high pass filter circuit or a differential circuit is a method for clearly distinguishing a change in an optical signal. By using the detector 224, as a result, a relatively high level signal such as the waveform (b) of FIG. 4A can be obtained.

The output of the rate-of-change detector 224 passes through a hysteresis comparator 225. The hysteresis comparator 225 compares an input signal with a signal of a predetermined level, and sets a positive value when the input is an analog signal of a predetermined level or more. If it is below the level, a signal having a negative value is output. The analog signal is level shifted using the A / D converter 226 to obtain a digitized signal such as waveform (C).

By the way, the output of the A / D converter 226 is a digital signal that is not suitable for grasping the blinking interval because the noise component is included or the width is not constant, as can be seen from the waveform (c) of FIG. 4C, for example. In order to obtain a digital signal of which noise is removed and the width is constant, such as waveform (d), the digital filter 227 is passed through, and the output of the digital filter 227 is input to the microprocessor 231. That is, the digital filter 227 counts the width of the high and low signals output from the hysteresis comparator 225 to a predetermined counter, but the width (holding time) of the high or low signal is a constant counting value (minimum lighting of the mobile phone display). It is equipped with an error correction algorithm that removes the high or low signal when it is smaller than the reference value corresponding to the time or the minimum unlit time.
Then, the microprocessor 231 analyzes the information using the digital signal, and transmits the result to an external device or the Internet through the communication unit 232. In this case, the communication unit 232 and an external device (for example, a PC, a game machine, etc.) or the Internet may be connected using an interface such as USB, RS-232, IEEE-485, or Ethernet.

Next, FIG. 4B illustrates an operation waveform of the optical receiver 200 according to the present invention when optical noise from the outside occurs. FIG. 4C is an enlarged waveform of a portion of FIG. 4B on the time axis.

As can be seen from the waveform (A) of FIG. 4B, when optical noise from the outside occurs, the optical signal obtained through the light receiving sensor 210 includes a lot of noise, and the signal passed through the optical / electrical signal converter 221. Again, a lot of noise is included (not shown). However, the signal is substantially reduced noise while passing through the analog filter 223 according to the present invention, the result can be confirmed from the signal waveform (b) passed through the rate of change detector 224. The above signal, which still contains some noise, passes through the hysteresis comparator 225 and the A / D converter 226 according to the present invention, and a stable digital waveform such as the waveform (c) of FIG. 4B is obtained.

However, despite the various steps of waveform shaping as described above, in some cases, even the output of the A / D converter 226 may cause unexpected noise signals such as those marked with asterisk (*) in the waveform (C) of FIG. 4C. The signal not exceeding a predetermined width is removed by the digital filter 227 according to the present invention having an error correction function which is regarded as a noise component and ignored. As a result, the waveform of FIG. A robust digital waveform is obtained. Since the subsequent steps are the same as described above, the description is omitted.

On the other hand, the present invention is a data communication through the public wireless network, communication between the display unit and the light receiving unit, data recognition by the light receiving unit, signal transmission between the internal circuits of the optical receiver and data transmission between the optical receiver and external devices, control Errors can occur while data is being sent and received and processed, such as interrupts from firmware while software is running. In the case of general communication such as the Internet, a check sum, a frame check sequence (FCS), or a cyclic redundancy check (CRC) technique is used to check whether there is an error in the data received from the receiver. Most of the ARQ (Automatic Repeat reQuest) method that requests the transmitter to retransmit and receives data without error.
However, in the present invention, only one-way communication from the portable terminal on the sending side to the reader of the present invention on the receiving side is possible, not bidirectional communication, and thus retransmission cannot be requested when there is an error in the data received from the reader. Therefore, in the present invention, if there is an error in the received data, the FEC (Forward Error Correction) method that can correct the error on its own is required without requiring the transmitter to retransmit.

Next, a description will be given of the control software for enabling the display of the portable communication terminal to blink.

In order to make the display unit blink, the display unit must be controlled by an appropriate method. In the present invention, the control of the display unit can be realized simply by controlling software without using any additional hardware or additional devices.

5 and 6 illustrate a process in which the control software is mounted in the memory and executed, the software must first be mounted in the memory 130 of the portable communication terminal (S300, S420) before the control software is executed. Here, there are several ways to mount the software on the portable communication terminal as follows.

First, at the time of manufacturing the portable communication terminal, the manufacturer has previously installed software for controlling the inherent functions of the portable communication terminal, that is, software for controlling the firmware in the portable communication terminal together with the software for the control ( S300). This method has the advantage that the user can eliminate the hassle of downloading the control software through the wireless Internet.

Second, the user can download and use it through a communication network. That is, as shown in FIG. 6, when the user's portable communication terminal is not equipped with software (S430), the portable communication terminal connects to the server where the control software is stored through a communication network or the like, and downloads the control software from the server. How to receive (S420). Here, the server includes a server of a telecommunication company, a server of a general operator, a personal server, or a personal PC. This method is useful when the control software is updated or new software can be downloaded from time to time (S310). Of course, this method can also be used when a new program is to be updated even when the control software is mounted at the time of initial production as shown in FIG.

Thirdly, the user requests the server to send the software or the server asks the user whether to download the software. That is, the user requests transmission of the software to the operator of the server that stores the control software using wired or wireless communication means, or the server asks the user whether to download the software, and if the user wants to download the software, It is a method of forwarding control software to a portable communication terminal.

Fourth, a method in which a user connects a portable communication terminal to a server or a PC using a communication interface such as USB, RS-232, or IEEE-485, and directly downloads software.

When the control software is installed in the above process, the next step is to check whether there is a request for information transmission through the display unit of the portable communication terminal (S320 and S410). The request for transmitting the information may be made by the user using a keypad (not shown) installed in the terminal, using voice, or a preset program. If the result of the check is that there is no request for transmission, the normal basic functions are performed (S350 and S460), and if there is a request, the processing proceeds to the step of processing the information to be transmitted.

The next step is to process the transmission information (S330, S440). The information processing step is a step of combining and converting data into a structure suitable for transmitting information required for transmission by the apparatus and method of the present invention. In this step, for example, when the present invention is applied to payment and authentication, authentication information such as a user ID, a telephone number, a password, etc. (these information may be stored inside the portable communication terminal or input externally). And then convert the code into binary code and convert it into a code that can correct errors so that the receiver can correct the error on its own if there is a communication error.

The next step is to control the portable communication terminal in order to transmit the combined and converted binary data in the above process to flash the display or change the color (S340 and S450). For example, if 16 bits of information such as (0110 0110 0011 1001) are generated in the above process, the controller 110 may export the data from the left bit of the data (from the right side, of course, but from the left side for convenience). Sequentially) " 0 "-" 1 "-" 1 " → "1" will be sent. As described above, the division of "0" and "1" is to transmit information through the display unit by "0" shortening the flashing time and "1" long (or vice versa).

When the above process is completed, in the next step, the light receiving sensor 210 detects a change in the optical signal of the display unit, and the optical signal is converted into an analog electric signal by an optical / electric signal converter. The converted analog signal is amplified by an amplifier and filtered by an analog filter. Since the filtered signal has a low signal level, a change rate is detected using a change rate detector, that is, a differentiator, and the result is compared with a predetermined value by hysteresis. . Since the output of the hysteresis comparator is an analog signal with a value of +/-, this value is converted into a digital signal through an A / D converter.
The digitally converted signal is input to a digital filter, and the digital filter counts the widths of the high and low signals with a predetermined counter, but if the width (holding time) of the high or low signal is smaller than a predetermined counting value, Or remove the low signal to correct the error.
The digital signal passed through the digital filter is input to the microprocessor and the information is analyzed and processed, and the processed information is transmitted to an external device or the Internet through an interface such as USB, RS-232, IEEE-485 or Ethernet. do.
As described above, in the present invention, a predetermined sampling time is set and the light is not simply flickered to represent data "1" and "0". Instead, the data is represented using the flickering interval of light, thereby interrupting the mobile phone. For example, in a situation where priority is given to regular communication with a base station for location recognition, it is possible to overcome a situation in which it is impossible to blink a screen of a mobile phone at a predetermined time interval.
In other words, when the information is transmitted using the blinking of the mobile phone display, interrupts are frequently generated due to the processing of the unique functions of the mobile phone. In this case, even if there is an interrupt, only one bit of error occurs but there is no increase in the number of bits.In this case, the error of one bit is sufficiently solved by an error correction algorithm (digital filter). The advantage is that it can solve the interrupt problem according to the function.
Although only one embodiment of the present invention has been shown above, the above-described light receiving unit of the present invention is manufactured in combination with a module capable of receiving an RF signal or an infrared signal. It can be easily implemented by those skilled in the art without departing from the scope and spirit of the invention.

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The present invention proposes a communication apparatus and method using a flickering or color change of a display unit of a portable communication terminal, and furthermore, a communication apparatus and method having excellent reliability that does not interfere with external optical noise.

In the present invention described above, even when payment or authentication is made using a portable communication terminal, since the control software can be simply downloaded and executed without adding a separate device to an existing mobile phone, the cost for installation or use is hardly required. Not only does it have a very convenient effect.

In addition, the optical receiver proposed by the present invention has a very robust structure against noise such as external optical interference, which is not only excellent in reliability but also a malfunction that may occur in the process of transmitting and receiving data by applying a code having an error correction function. It has excellent performance to minimize it.

Claims (26)

The light receiving unit 200 includes a portable communication terminal 100 including a control unit 110, a memory unit 120, and a display unit 130, and a light receiving sensor 210, a signal conversion unit 220, and a control unit 230. In a communication device consisting of: The control unit 110 of the portable communication terminal 100 controls the flashing interval of the display 130, but expresses the data "1" and "0" according to the flashing interval of the display and transmits to the optical receiver 200 , The light receiving unit 200 detects the blinking interval of the light transmitted from the display unit 130 through the light receiving sensor 210, but the data "1" and the data "0" according to the blinking interval of the light through the control unit 230. Communication device using the display unit blinking interval of the portable communication terminal, characterized in that configured to determine. The apparatus of claim 1, wherein the portable communication terminal 100 is any one of a mobile phone, a cellular phone, a PDA, a PCS, a CDMA-2000, and an IMT-2000. . The communication apparatus of claim 1, wherein the display unit of the portable communication terminal comprises one of an LED, an LCD, an organic EL, and a plasma display. The communication device according to claim 1, wherein the memory unit (120) of the portable communication terminal includes control software for changing the blinking interval of the display unit. The display of claim 1, wherein the blinking interval of the display unit 130 is configured such that data “0” of the binary information is shortly blinked and data “1” is blinked longer than “0”. Communication device using secondary flashing interval. The method of claim 1, wherein the flashing interval of the display unit 130 of the binary information, the data "1" is briefly flashing, the data "0" is configured to flash longer than the data "1" of the portable communication terminal Communication device using the display unit blinking interval. The communication device according to claim 1, wherein the light receiving sensor (210) is one of a photo transistor and a CdS. The communication apparatus according to claim 1, wherein the optical receiver 200 further includes a module capable of sensing any one or more signals of an RF signal or an infrared signal. The method according to claim 1, The signal conversion unit 220 of the light receiving unit 200, An optical / electrical signal converter 221 for converting an optical signal into an electrical signal; An amplifier 222 for amplifying the electric signal converted by the optical / electric signal converter; An analog filter 223 for filtering out the signal of the amplifier to remove noise; A change rate detector (224) for detecting a rate of change of the signal filtered through the analog filter; A hysteresis comparator (225) for comparing the output of the detector with a predetermined value; An A / D converter 226 for converting the output of the comparator into a digital signal; And An error correction algorithm for counting the width of the high and low signals output from the A / D converter with a predetermined counter and removing the high or low signal when the width (holding time) of the high or low signal is smaller than a predetermined counting value is provided. Applied digital filter; the communication device using the display unit blinking interval of the portable communication terminal, characterized in that consisting of. The method according to claim 1, The control unit 230 of the light receiving unit 200, A microprocessor 231 for determining a blinking interval of light from the output of the signal converter 220 to decode binary information, correct an error, and process the received information; And Communication unit (232) for connecting the microprocessor (231) and an external device or a communication network; Communication device using a display unit blinking interval of the portable communication terminal. The method of claim 10, wherein the communication unit 232 is connected to the external device or the Internet through any one of USB, RS-232, IEEE-485, Ethernet means using the display unit flashing interval of the portable communication terminal Communication device. In a communication method using a portable communication terminal having a control unit, a memory unit and a display unit: A first step of mounting control software for changing a blinking interval of the display unit in a memory of the portable communication terminal; A second step of processing, by the controller of the portable communication terminal, the information to be transmitted if there is a data transmission request using the display flashing, and performing a normal basic function if there is no transmission request; And And a third step of transmitting the data expressed according to the blinking interval to the outside by changing the blinking interval of the display unit according to the information processed in the second step. . In a communication method using a portable communication terminal having a control unit, a memory unit and a display unit, and a light receiving unit comprising a light receiving sensor, a signal conversion unit and a control unit: A first step of mounting control software for changing a blinking interval of the display unit in a memory of the portable communication terminal; A second step of processing, by the controller of the portable communication terminal, the information to be transmitted if there is a data transmission request using the display flashing, and performing a normal basic function if there is no transmission request; A third step of transmitting the data expressed according to the blinking interval to the outside by changing the blinking interval of the display unit according to the information processed in the second step; A fourth step of detecting a change in the light blinking interval of the display unit by a light receiving sensor of the light receiving unit; A fifth step of converting the optical signal received through the light receiving sensor into a digital signal through a signal converter; A sixth step of controlling, by the control unit of the optical receiver, the binary information from the converted digital signal and correcting the error if there is an error in the binary information; And And a seventh step of processing the information and transmitting data to an external device or the Internet. The method of claim 12 or 13, wherein the first step, Communication method using the display unit blinking interval of the portable communication terminal, characterized in that for mounting the control software in the memory when manufacturing the portable communication terminal. The method of claim 12 or 13, wherein the first step, Determining whether control software exists in a memory of the portable communication terminal; Moving to the next step if the control software exists in the memory, and if the control software does not exist in the memory, connecting to a server storing the control software through a communication network through a portable communication terminal; And Downloading the control software from the server; Communication method using the display unit blinking interval of the portable communication terminal, characterized in that consisting of. The method of claim 12 or 13, wherein the first step, Determining whether control software exists in a memory of the portable communication terminal; If the control software exists in the memory, moving to the next step; if the control software does not exist in the memory, a portable communication terminal requesting the server to transmit the control software; And And transmitting, by the server, the control software to the portable communication terminal requesting the transmission, using the display unit blinking interval of the portable communication terminal. The method of claim 12 or 13, wherein the first step, The server asking the user whether to download the control software; And If the user does not want to go to the next step, if the user wants the server to transmit the control software to the portable communication terminal; Communication method using the flashing interval of the display portion of the portable communication terminal, characterized in that consisting of. The method of claim 12 or 13, wherein the first step, Storing the control software in a memory when the portable communication terminal is manufactured; Determining whether an update of the software is required; Moving to a next step if the update is not necessary, and connecting to a server storing control software through a communication network through a communication network if an update is required; And Downloading the control software from the server; Communication method using the display unit blinking interval of the portable communication terminal, characterized in that consisting of. The method of claim 12 or 13, wherein the first step Storing the control software in a memory during manufacture of the portable communication terminal; Determining whether an update of the software is required; Moving to the next step if the update is not required, and if the update is required, requesting the server to transmit control software to the server; And And transmitting, by the server, the control software to the portable communication terminal requesting the transmission, using the display unit blinking interval of the portable communication terminal. The method of claim 12 or 13, wherein the first step, Storing the control software in a memory during manufacture of the portable communication terminal; If the software is updated, asking the server whether to download the control software to the user; And If the user does not want to go to the next step, and if desired, the server transmits the control software to the portable communication terminal requesting the transmission; communication method using a flashing interval of the display portion of the portable communication terminal. The method of claim 12 or 13, wherein the first step, A user connecting his portable communication terminal to a PC or a server using a communication interface; And A user directly downloading the control software from the PC or server; Communication method using the display unit blinking interval of the portable communication terminal, characterized in that consisting of. The method according to claim 12 or 13, wherein the second step, Combining information necessary for transmission; Encrypting the combined information; Converting the encrypted information into a binary code; And Transmitting information of the binary code; and a communication method using a display unit blinking interval of the portable communication terminal. The method of claim 22, wherein combining the information required for transmission comprises: Communication method using the display unit blinking interval of the portable communication terminal, characterized in that it comprises an error correction code for removing the communication error. The method according to claim 12 or 13, wherein the third step, The display unit of the portable communication terminal is characterized in that the flashing interval is shortened when the data to be transmitted is "0" in the binary information, and the flashing interval is longer than "0" when the data is "1". Communication method using secondary flashing interval. The method according to claim 12 or 13, wherein the third step, When the data to be transmitted is "1" of binary information, the flashing interval of the display unit is shortened, and when the data is "0", the flashing interval is longer than "1". Communication method using the display unit blinking interval. The method of claim 13, wherein the fifth step, Converting the optical signal into an analog electrical signal; Amplifying the converted analog signal; Filtering the amplified signal with an analog filter to remove noise; Detecting a rate of change of the filtered signal; Comparing the detected rate of change with a predetermined value and hysteresis; Converting the comparison result into an analog signal into a digital signal; And And re-filtering the digital signal to correct an error by removing the corresponding high or low signal when the width of the high or low signal is smaller than a predetermined reference width, using the display unit flashing interval of the portable communication terminal. Communication method.

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