JP2009181406A - Portable information terminal, method of preventing screen of portable information terminal from being illegally viewed, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable information terminal changing visibility of a screen without requiring specific key operation. <P>SOLUTION: The portable information terminal comprises: a Web browser control part which performs communication to acquire Web data; a communication state determination part which refers to a communication protocol in use to determine the confidentiality of the Web data based on the kind of the communication protocol; and a display control part which converts a display image of the Web data, when the Web data is confidential, to display the data with low visibility, and displays the display image of the Web data with general visibility when the Web data is not confidential. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a portable information terminal, and more particularly to a portable information terminal having a screen viewing prevention function.

  Mobile information terminals have been widely used in general, and there are increasing opportunities for users to perform financial transactions such as banks and securities, Web shopping, and the like using mobile information terminals. In such a service, the user needs to input confidential information such as personal information and a password.

  However, since the mobile information terminal is used, the user often inputs secret information such as personal information and a password at a public institution such as a train. For this reason, there is a problem that there is a risk that secret information entered by the user may be leaked when another person looks into the screen of the portable information terminal.

  In order to solve such a problem, a technique relating to prevention of peeping at a portable information terminal screen has been disclosed. These are technologies that make it difficult for others to look into the screen of the portable information terminal by narrowing the viewing angle of the portable information terminal screen. Such technology changes the visibility of the screen by the user performing key input, or changes the visibility of the screen based on a flag previously assigned to the data file. There was a problem of taking time and effort.

  Patent Document 1 discloses a portable information terminal that provides a portable information terminal device that does not require an operation input to narrow the viewing angle for each highly confidential display screen. The portable information terminal of Patent Document 1 includes display restriction information storage means for storing display restriction information indicating whether or not the screen data is secret data associated with user data, and secret data by the display restriction information. Display mode designation information storage means for rewritably storing display mode designation information for designating either the first display mode for not displaying the second display mode or the second display mode for displaying the secret data, and the display mode designation information. Application execution means for selecting user data to be displayed and displaying the user data on the screen, and viewing angle control means for narrowing the viewing angle of the display screen based on the display mode designation information. It is characterized by.

JP 2006-319554 A

  The objective of this invention is providing the portable information terminal which can change the visibility of a screen, without performing specific key operation.

  The portable information terminal of the present invention refers to a web browser control unit that performs communication for acquiring web data and a communication protocol during communication, and determines the confidentiality of the web data based on the type of the communication protocol. If the web data has confidentiality, the display image of the web data is converted and displayed in a low visibility state. If the web data does not have confidentiality, the display image of the web data is A display control unit that displays the image with normal visibility.

  According to the portable information terminal screen peeping prevention method of the present invention, the secrecy of web data is determined based on the type of the communication protocol with reference to the communication protocol for communicating the web data and the communication protocol being communicated. If the Web data has confidentiality, the display image of the Web data is converted and displayed with low visibility. If the Web data does not have confidentiality, the display image of the Web data is usually displayed. And displaying with the visibility.

  The program of the present invention realizes the above-described method of preventing the user from looking into the screen of the mobile phone terminal.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the portable information terminal which can change the visibility of a screen, without performing specific key operation.

  A mobile phone terminal according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[Description of configuration]
First, a system configuration using the mobile phone terminal according to the present embodiment will be described with reference to FIG. The system configuration of FIG. 1 includes a portable information terminal 100, a Web (World Wide Web) server 200, and an Internet network 300.

  First, the Web server 200 will be described. The web server 200 stores web content. Web server 200 transmits Web data in response to a Web data request received from portable information terminal 100 via Internet network 300.

  FIG. 2 shows the configuration of the Web server 200. The Web server 200 includes a server communication unit 201, a server control unit 202, and a server storage unit 203.

  The server communication unit 201 includes a communication port and the like. The server communication unit 201 can communicate with other devices using a communication port. The server communication unit 201 receives a Web request from the portable information terminal 100 via the Internet network 300. The server communication unit 201 outputs the received Web request to the server control unit 202. The server communication unit 201 also inputs Web data output from the server control unit 202. The server communication unit 201 transmits the input Web data to the portable information terminal 100 via the Internet network 300.

  The server control unit 202 includes a CPU (Central Processing Unit) and the like. The server control unit 202 implements the function of the Web server 200 by reading and executing a processing program stored in the server storage unit 203. The server control unit 202 inputs a Web request output from the server communication unit 201. The server control unit 202 acquires the Web data requested by the Web request from the server storage unit 203. The server control unit 202 outputs the Web data acquired from the server storage unit 203 to the server communication unit 201 in order to transmit it to the portable information terminal 100.

  The server storage unit 203 stores a processing program for realizing the function of the Web server 200. The server storage unit 203 stores Web data of Web content. Web data is described in HTML (Hyper Text Markup Language) or the like. In response to a request from the server control unit 202, the server storage unit 203 extracts the requested Web data and outputs it to the server control unit 202.

The data stored in the server storage unit 203 includes Web data with low confidentiality and Web data with high confidentiality.
Data Web data with low secrecy is Web data that does not contain information such as personal information or confidential information on the Web screen output by the Web data. For example, if Web data constituting the homepage of a securities company is described as an example, Web data for displaying a top screen of the homepage, a screen for introducing the securities company, and the like corresponds to this. Even if the user looks into the Web screen displayed by the Web data by another person, no particular problem occurs.
On the other hand, highly confidential Web data is Web data including information such as personal information and confidential information on a Web screen output by the Web data. For example, Web data constituting the homepage of a securities company will be described as an example, which includes a screen for inputting an account opening material and a screen for logging in by inputting an ID or password into a personal account. If a user looks into the web screen displayed by the web data by another person, personal information will be leaked.

Due to such a difference in confidentiality, it is usually specified that the protocol for the mobile information terminal 100 to acquire Web data from the Web server 200 is different between Web data with low confidentiality and Web data with high confidentiality. ing.
In general, when the Web browser of the portable information terminal 100 acquires Web data with low confidentiality, HTTP (Hyper Text Transfer Protocol) that operates on TCP (Transmission Control Protocol) / IP (Internet Protocol) is used. . HTTP is a general protocol for the Web browser of the portable information terminal 100 to acquire Web data. Web data acquired using HTTP is specified by a URL (Uniform Resource Locator) starting from “HTTP: //”.
On the other hand, in order for the portable information terminal 100 to acquire highly confidential Web data, HTTPS (Hyper Text Transfer Protocol Security) that operates on TCP / IP is used. HTTPS is a general protocol for encrypting and transmitting / receiving Web data by operating HTTP on SSL (Secure Socket Layer). Web data acquired using HTTP is specified by a URL starting with “HTTPS: //”.
Since both HTTP and HTTPS are general protocols used when acquiring Web data on the Internet, detailed descriptions of their operations are omitted. Web data stored in the Web server 200 is specified and stored by the Web content producer so as to use the HTTP or HTTPS protocol according to the confidentiality.

Next, the Internet network 300 will be described. The Internet network 300 is a network network that transfers communication between the portable information terminal 100 and the Web server 200. The network network constituting the Internet network 300 is not limited to the Internet. For example, when the mobile information terminal 100 is a mobile phone, the mobile information terminal 100 connects to the Internet via a mobile phone network. The Internet network 300 can be realized by a network other than the Internet as long as the mobile information terminal 100 can transfer data for acquiring Web data from the Web server 200.
In addition, the Internet network 300 includes access means for the portable information terminal 100 to connect to the network. For example, the Internet network 300 includes a wireless LAN access point when the portable information terminal 100 is a wireless LAN (Local Area Network) terminal. As described above, the Internet network 300 includes access means corresponding to the communication method of the portable information terminal 100 without being limited to specific access means.

  Next, the portable information terminal 100 will be described. The portable information terminal 100 acquires Web data from the Web server 200 via the Internet network 300. FIG. 3 shows the configuration of the portable information terminal 100. The portable information terminal 100 includes a communication unit 101, a control unit 102, a storage unit 103, an input unit 104, and an output unit 105.

  The communication unit 101 includes an antenna for wireless communication and a transmission / reception unit for wireless communication, and performs wireless communication with a base station device of the Internet network 300 and the like. The protocol of wireless communication performed by the communication unit 101 with the Internet network 300 depends on the type of the portable information terminal 100 and is not particularly limited.

  The control unit 102 includes a CPU and the like. The control unit 102 implements the function of the portable information terminal 100 by reading and executing the processing program stored in the storage unit 103.

  The storage unit 103 includes a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The storage unit 103 stores a processing program to be executed by the control unit 102. The storage unit 103 stores information necessary for functions provided by the portable information terminal 100, such as a telephone directory.

  The input unit 104 includes keys for input. The input unit 104 receives a key input such as a Web data acquisition command from the user.

  The output unit 105 includes an LCD (Liquid Crystal Display). The output unit 105 displays the acquired Web data as a display image.

  The functions of the portable information terminal 100 are realized by these configurations. Note that the portable information terminal 100 is a portable information terminal equipped with a web browser such as a mobile phone, a smart phone, a PDA (Personal Digital Assistant), a wireless LAN module (or card), or a mobile laptop equipped with a Bluetooth module (card). Including widely.

  Next, the portable information terminal 100 will be described in detail with reference to FIG. FIG. 4 shows a functional block diagram of the portable information terminal 100. The portable information terminal 100 further includes a communication unit control unit 111, a web browser control unit 112, a communication state determination unit 113, a light / dark conversion table generation unit 114, and a display display control unit 115.

  The communication control unit 111 transmits and receives data by communicating with the Web server 200. The communication control unit 111 inputs a page acquisition request output from the Web browser control unit 112 and transmits the page acquisition request to the Web server 200 using a predetermined protocol. Further, the communication control unit 111 outputs Web data from the communication data received from the Web server 200 to the Web browser control unit 112.

  The web browser control unit 112 outputs to the communication control unit 111 a web page acquisition request for a URL that is input by the user to the input unit 104 or specified using the input unit 104. In addition, the web browser control unit 112 receives the web data acquired by the communication control unit 111 from the web server 200 and renders it into a display image that can be displayed on the display unit 105. The web browser control unit 112 outputs the rendered display image to the display display control unit 115.

The communication state determination unit 113 acquires the protocol with which the web browser control unit 112 is communicating, and determines the confidentiality of the web data being communicated. The communication state determination unit 113 determines the confidentiality of the Web data based on the protocol type. In the present embodiment, the communication state determination unit 113 determines confidentiality based on whether the protocol is HTTP or HTTPS.
The communication state determination unit 113 determines the communication protocol based on the port number. The web browser normally identifies data by assigning 80 to the HTTP port number and 443 to the HTTPS port number when transferring data between the transport layer and the session layer. The communication state determination unit 113 determines that HTTP is used if the communication protocol acquired from the web browser control unit 112 uses the port number 80. On the other hand, if the communication protocol acquired from the Web browser control unit 112 uses the port number 443, the communication state determination unit 113 determines that HTTP is being used. The communication state determination unit 113 outputs the determination result of the communication protocol to the grayscale conversion table generation unit 114.
The designation of the port number in the well-known port on TCP / IP is well known and will not be described. Note that the method by which the communication state determination unit 113 determines the communication protocol is not limited to this. Further, when the web browser control unit 112 performs communication by changing the port number, the communication state determination unit 113 may perform the determination corresponding to this.

  The light / dark conversion table generation unit 114 generates a light / dark conversion table for the display display control unit 115 to perform luminance conversion on the display image of the Web data. The density conversion table is a table for the display display control unit 115 to perform luminance conversion on the display image of the Web data output from the Web browser control unit 115. The display display control unit 115 converts the output luminance to the output luminance corresponding to the input luminance by using the density conversion table.

The light / dark conversion table generating unit 114 generates a light / dark conversion table according to the determination result of the communication protocol output from the communication control unit 111. The grayscale conversion table generation unit 114 inputs a communication protocol determination result output from the communication control unit 111.
The light / dark conversion table generation unit 114 generates a normal light / dark conversion table when the determination result of the communication protocol is HTTP. The normal light / dark conversion table is a table in which the luminance of the input display image is the same as the luminance of the display image that is converted and output. When luminance conversion is performed using a normal shading conversion table, the display image is not particularly changed from the state of high visibility output by the Web browser control unit 112.
On the other hand, when the communication protocol determination result is HTTPS, the light / dark conversion table generation unit 114 generates a light / light conversion table that is difficult to view. The shading conversion table that is difficult to visually recognize is a table in which when the input display image is converted and output, the shading of the display image is light (the brightness difference is small). When luminance conversion is performed using a shading conversion table that is difficult to visually recognize, the display image is output as an image in which characters and images are difficult to confirm (low visibility).

The luminance conversion of the display image is a known technique and will not be described in detail. Note that the characteristics of the non-linear curve of the normal density conversion table and the density conversion table that is difficult to visually recognize are not specifically limited. As described above, the normal shading conversion table may be one in which the output luminance is the same as the input luminance of the display image, or may be one in which luminance conversion is performed so that the visibility of the display image is increased.
Further, the shading conversion table that is difficult to visually recognize may be a table that converts the shading of the display image to be light (the luminance difference is small) or may be converted to be thin overall. Alternatively, the shading conversion table that is difficult to visually recognize may convert the display image into a whitish color as a whole, or conversely convert it into a blackish color as a whole. In any case, when a shading conversion table that is difficult to visually recognize is used, if the Web screen displayed on the output unit 105 can be converted into a display image that is difficult to visually perceive (low visibility), that specific The typical value is not limited.
The light / dark conversion table generating unit 114 outputs the generated light / dark conversion table to the display display control unit 115.

The display display control unit 115 performs luminance conversion on the display image of the Web data output by the Web browser control unit 112 using the light / dark conversion table generated by the light / light conversion table generation unit 114 and displays the display image on the LCD of the output unit 105. .
The display display control unit 115 inputs the shading conversion table generated by the shading conversion table generating unit 114. In addition, the display display control unit 115 inputs a display image of Web data output from the Web browser control unit 112. The display display control unit 115 converts the brightness of the display image of the Web data using the shading conversion table. The display display control unit 115 displays the converted display image on the LCD of the output unit 105.

FIG. 5 shows a display image of Web data by the normal grayscale conversion table generated by the grayscale conversion table generation unit 114 when the display protocol of the display control unit 115 is HTTP and the communication protocol used by the Web browser control unit 115 is HTTP. A state after conversion and display on the LCD of the output unit 105 is shown. In this case, since the display image of the Web data is converted by the normal shading conversion table, the luminance does not change, and the display is easy to see as usual (high visibility).
On the other hand, FIG. 6 shows a case where the display display control unit 115 uses the grayscale conversion table generated by the grayscale conversion table generation unit 114 when the communication protocol used by the web browser control unit 115 is HTTPS, and the web data The display image is converted and displayed on the LCD of the output unit 105. In this case, since the display image of the Web data is converted by the shading table which is difficult to visually recognize, the shading is light (the luminance difference is small), and the display is difficult to visually recognize (low visibility).
As a result, in the case of data communication with confidentiality, it is possible to make it difficult to check the displayed information even if another person looks into it. On the other hand, in the case of data communication without confidentiality, the display does not change and the displayed information remains easy to confirm.

The above is the description of the configuration in the present embodiment. Since the data is determined to be confidential when HTTPS is used as the communication protocol, the user of the portable information terminal 100 deteriorates the visibility of the Web page displayed on the output unit 105 without performing a switching operation or the like. be able to. This makes it difficult to check the displayed information even if another person looks into the portable information terminal 100.
In addition, when HTTP is used as the communication protocol, it is determined that the data is not confidential, so that the user of the portable information terminal 100 can view the Web page displayed on the output unit 105 without performing a switchback operation or the like. Can be improved. As a result, normal data can be displayed normally, which is easy to confirm.
Furthermore, since the communication protocol setting for data that is normally confidential or data that is not confidential is performed when the Web content creator registers the Web content in the Web server 200, the user of the portable information terminal 100 There is no need to make extra settings in advance.

[Description of operation method]
Next, an operation method according to this embodiment will be described with reference to FIG. FIG. 7 shows an operation flow in the present embodiment.

(Step 1)
The user designates the URL of the Web page stored in the Web server 200 from the input unit 104 and inputs a Web page acquisition request. The Web browser control unit 112 detects a Web page acquisition request and outputs a page acquisition request addressed to the URL of the Web page to the communication control unit 111.

(Step 2)
The communication control unit 111 inputs a page acquisition request output from the web browser control unit 112. Based on the page acquisition request, the communication control unit 111 creates a communication frame such as TCP / IP including a predetermined protocol of HTTP or HTTPS, and communicates with the server communication unit 201 of the Web server 200. The web browser control unit 112 communicates with the server control unit 202 of the web server 200 using communication between the communication control unit 111 and the server communication unit 201 and acquires web data from the server storage unit 203. The web browser control unit 112 renders the acquired web data on a display image. The web browser control unit 112 outputs the display image to the display display control unit 115. The TCP / IP communication performed by the communication control unit 111 and the server communication unit 201, encryption key setting processing in HTTPS communication, and the like are well-known techniques, and thus description thereof is omitted.

(Step 3)
The communication state determination unit 113 acquires a communication protocol that the Web browser control unit 112 performs with the server control unit 202. The communication state determination unit 113 determines whether the communication protocol of communication performed by the web browser control unit 112 is HTTPS. The communication state determination unit 113 outputs the determination result of the communication protocol to the light / dark conversion table generation unit 114. If the communication protocol is HTTPS, go to Step 4. If the communication protocol is not HTTPS, the process proceeds to step 5.

(Step 4)
The light / dark conversion table generation unit 114 receives the communication protocol determination result from the communication state determination unit 113. When the communication protocol is HTTPS as a result of the determination, the light / dark conversion table generation unit 114 generates a light / light conversion table that is difficult to view.

(Step 5)
The light / dark conversion table generation unit 114 receives the communication protocol determination result from the communication state determination unit 113. If the result of determination is that the communication protocol is not HTTPS, the tone conversion table generation unit 114 generates a normal tone conversion table.

(Step 6)
The display display control unit 115 inputs a display image of Web data output from the Web browser control unit 112. The display display control unit 115 performs brightness conversion of the display image of the Web data using the light / dark conversion table generated by the light / light conversion table generating unit 114. When the protocol during communication is HTTP, the display image remains a display image that is easily visible as usual even after luminance conversion. On the other hand, when the protocol during communication is HTTPS, the brightness of the display image is converted to a display image that is difficult to view. The display display control unit 115 displays the display image after the luminance conversion on the LCD of the output unit 105.

The above is the description of the operation method in the present embodiment. The communication state determination unit 113 acquires the communication protocol used by the web browser control unit 112 for communication, and determines whether it is HTTP or HTTPS.
The communication state determination unit 113 determines that the data is confidential when HTTPS is used as the communication protocol. The light / dark conversion table generation unit 114 generates a light / light conversion table that is difficult to view when the communication protocol is HTTPS. The display display control unit 115 converts the display image of the Web data into a display image that is difficult to visually recognize, using a shading conversion table that is difficult to visually recognize, and outputs the display image to the output unit 105. Therefore, the user of the portable information terminal 100 can deteriorate the visibility of the Web page displayed on the output unit 105 without performing a switching operation or the like. This makes it difficult to check the displayed information even if another person looks into the portable information terminal 100.

On the other hand, the communication state determination unit 113 determines non-confidential data when HTTP is used as a communication protocol. The light / dark conversion table generation unit 114 generates a normal light / light conversion table when the communication protocol is HTTP. The display display control unit 115 converts the display image of the Web data into a display image that is difficult to visually recognize, and outputs the display image to the output unit 105 using a normal density conversion table. Therefore, the user of the portable information terminal 100 can improve the visibility of the Web page displayed on the output unit 105 without performing a switching back operation or the like. As a result, normal data can be displayed normally, which is easy to confirm.
Furthermore, since the communication protocol setting for data that is normally confidential or data that is not confidential is performed when the Web content creator registers the Web content in the Web server 200, the user of the portable information terminal 100 There is no need to make extra settings in advance.

In the present embodiment, the portable information terminal 100 realizes visibility switching by performing luminance conversion of a display image according to a communication protocol. This can also be realized by using a display device having a viewing angle control function. When using the viewing angle control function, when the communication protocol is HTTPS, the viewing angle is controlled to be narrow, and when the communication protocol is HTTP, the viewing angle is controlled to be wide (normal range). Good.
Alternatively, the backlight of the LCD may be dimmed when the communication protocol is HTTPS, and the LCD backlight may be brightly controlled (normal brightness) when the communication protocol is HTTP.
In addition, this embodiment can be realized even when the viewing angle control film is attached to the LCD of the output unit 105 of the portable information terminal 100.
In addition, display image brightness conversion, viewing angle control and LCD backlight control can be combined simultaneously or selectively, and these can also be realized on a display with a viewing angle control film attached. It is.

  As described above, according to the present invention, it is possible to switch between a state where the visibility of the screen of the portable information terminal 100 is high and a state where the visibility is low, and to switch back without any user operation. .

It is a figure which shows the structure of the system using a portable information terminal. It is a figure which shows the structure of a Web server. It is a figure which shows the structure of a portable information terminal. It is a figure which shows the functional block of a portable information terminal. This is a Web page displayed by converting the display image using a normal shading conversion table. This is a Web page that is displayed by converting the display image using a shading conversion table that is difficult to view. It is an operation | movement flow in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Portable information terminal 101 Communication part 102 Control part 103 Storage part 104 Input part 105 Output part 111 Communication control part 112 Web browser control part 113 Communication state determination part 114 Shading conversion table production | generation part 115 Display display control part 200 Web server 201 Server communication Unit 202 Server control unit 203 Server storage unit 300 Internet network

Claims (7)

A web browser control unit for performing communication for obtaining web data;
A communication state determination unit that refers to the communication protocol during communication and determines the confidentiality of the Web data based on the type of the communication protocol;
When the web data has confidentiality, the display image of the web data is converted and displayed with low visibility, and when the web data does not have confidentiality, the display image of the web data is displayed. A portable information terminal comprising: a display display control unit that displays with normal visibility. The portable information terminal according to claim 1,
The communication state determination unit determines that the Web data has confidentiality when the communication protocol is HTTPS, and the Web data has confidentiality when the communication protocol is HTTP. It is determined that there is no portable information terminal. The portable information terminal according to claim 1 or 2, wherein
When the web data has confidentiality, a shade conversion table for converting the display image of the web data to a state with low visibility is generated. When the web data does not have confidentiality, A light / dark conversion table generating unit for generating a light / dark conversion table for converting a display image of Web data with normal visibility;
The said display display control part is a portable information terminal which converts the display image of the said Web data based on the said light / dark conversion table, and displays the display image after conversion. Performing communication for acquiring Web data;
Determining the confidentiality of the Web data based on the type of the communication protocol with reference to the communication protocol during communication;
When the web data has confidentiality, the display image of the web data is converted and displayed with low visibility, and when the web data does not have confidentiality, the display image of the web data is displayed. A method of preventing the user from looking into the screen of the portable information terminal, comprising the step of displaying with normal visibility. 5. The method for preventing screen peeping of a portable information terminal according to claim 4, wherein the step of determining includes:
Determining that the Web data has confidentiality when the communication protocol is HTTPS, and determining that the Web data has no confidentiality when the communication protocol is HTTP. A method for preventing the mobile information terminal from looking into the screen. A method for preventing a user from looking into the screen of the portable information terminal according to claim 4 or 5,
When the web data has confidentiality, a shade conversion table for converting the display image of the web data to a state with low visibility is generated. When the web data does not have confidentiality, The method further includes the step of generating a shading conversion table for converting the display image of the web data while maintaining normal visibility.
The displaying step includes
A method for preventing a user from looking into the screen of the portable information terminal, comprising: converting a display image of the Web data based on the shade conversion table and displaying the converted display image.   The program which implement | achieves the screen look-in prevention method of the mobile telephone terminal in any one of Claim 4 to 6 with a computer.

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