KR20070010552A - Method and apparatus of displaying text message, and portable terminal therewith - Google Patents

Abstract

A method and an apparatus for displaying a text message and a mobile terminal having the same are provided to protect privacy and personal information of a user by allowing the user to check a message without being interfered. Pixel data for a background screen image and character information to be displayed are received(S510). A region to be taken by the characters to be displayed in the background screen image is extracted(S520). A pixel value of the background screen image with respect to the extracted region is extracted(S530). The pixel value is changed by adding/subtracting an offset to the extracted pixel value, or changed by a table previously set according to characteristics of an LCD(S540). The changed pixel data is outputted together with a background screen image so as to be displayed(S550).

Description

Method and apparatus for displaying text messages, and portable terminal having same

1A to 1D are reference diagrams for explaining a text message displaying process in a normal mode;

2A to 2F are reference diagrams for explaining a text message displaying process according to a preferred embodiment of the present invention when the background screen of the display unit is a monochrome screen;

3A to 3F are reference views for explaining a text message displaying process according to an embodiment of the present invention when the background screen of the display unit is a color screen including a plurality of colors;

3G and 3H are reference diagrams for explaining changing pixel values of pixels constituting the character area to match a background screen;

4 is a flowchart of a text message display method according to an embodiment of the present invention;

5 is a flowchart of a method for displaying a text message in a hidden mode according to an embodiment of the present invention;

6A to 6B illustrate a text message display screen displayed according to an embodiment of the present invention;

7 is a block diagram of a text message display apparatus according to an embodiment of the present invention;

8 is a block diagram of a mobile terminal having a text message display apparatus according to an embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a text display in a mobile terminal having a display. More particularly, the present invention relates to a text message display method and apparatus for displaying a text in combination with a background screen of the display.

When writing a text message in a mobile terminal having a display unit such as a mobile communication terminal, a personal digital assistant (PDA), or when displaying a received text message, a black text is generally displayed on a white background screen. On the other hand, the portable terminals are mostly provided with a liquid crystal display as a display unit, the recent liquid crystal display has a wide viewing angle can be viewed not only the user but also the person next to it.

Therefore, if you want to write a message while viewing the display or read a received message on a subway or bus, or in a place where there are a lot of people, the person next to you can easily see the contents. Not only is it inconvenient, there is a risk that personal information such as passwords and telephone numbers will be exposed to others.

In order to solve this problem, a detachable filter may be attached to the liquid crystal display of the mobile communication terminal. However, since the transparency of the filter is low, the screen of the liquid crystal display may not be easily seen by the user. It is inconvenient to carry it separately.

Accordingly, the technical problem to be achieved by the present invention is to change the color of the text or the received text message that the user is writing to a color similar to the color of the display background screen, thereby making it difficult for others to easily recognize the contents of the text message. A display method and an apparatus thereof, and a portable terminal having the same.

According to an aspect of the present invention, an input step of receiving a pixel value of a pixel constituting a background screen and a character to be displayed; An extraction step of extracting pixel values of an area occupied by the character in the background screen; A changing step of changing a pixel value by adding or subtracting a predetermined offset to the pixel value of the extracted region; And a display step of displaying according to the changed pixel value and the pixel value of the background screen.

The changing may include displaying a text area that is lighter than the color of the background screen by adding a predetermined offset that is changed according to the transparency desired by the user to the pixel value of the extracted area, or subtracting a color that is darker than the color of the background screen. It is preferable that the step of displaying the character area.

The changing of the pixel value may be performed by referring to a similar color mapping table in which color data of the same color is collected according to the viewing angle of the display unit.

In addition, the technical problem is an editing screen providing step of providing a text message editing screen; A display step of receiving a character from a user and displaying the input character in a color similar to a background screen color in a hidden mode and in a predetermined color in a normal view mode; And a setting changing step of displaying a character in a hidden view mode or a normal view mode when the display mode is changed during the input of the character.

On the other hand, according to another field of the present invention, the technical problem is a background screen pixel value extraction unit for extracting the pixel value of the pixel constituting the background screen; A text area pixel value extraction unit which receives a text to be displayed and extracts a pixel value of an area occupied by the text in the background screen; A pixel value changing unit for changing a pixel value by adding or subtracting a predetermined offset to the pixel value of the extracted region; A combiner constituting a display screen for synthesizing the changed pixel value and the pixel value of the background screen; And a display unit for displaying the synthesized screen.

In addition, according to another field of the present invention, the technical problem is a keypad for receiving a text input from the user; A text message transmission / reception unit configured to receive a text message from the other party or to transmit a text message to the other party; A text processing unit which extracts an area occupied from a background screen by a character inputted from the keypad or a text message sender and changes the area according to the pixel value of the background screen; And a display unit for displaying a character output from the character processing unit.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1A to 1D are reference diagrams for explaining a text message displaying process in a normal mode.

The normal mode is a mode of displaying a text message or a received message as it is. For example, in the case of displaying the letter 110 of 'ga' as shown in FIG. 1B on the background screen 100 as shown in FIG. 1A, the background screen as shown in FIG. 1C. A pixel of the region 120 occupied by the letter 'A' is extracted within 100, and the pixel value is set to '1' and the rest is set to '0'. When the set area is mapped to the color assigned to the letter 'ga' and displayed, the letter 'ga' 130 is displayed on the background screen 100.

2A to 2F are reference diagrams for describing a text message displaying process according to an exemplary embodiment of the present invention when the background screen of the display unit is a monochrome screen.

In the present invention, when the character is displayed in a color similar to the color of the background screen, the character is displayed in a color similar to the background screen by using the characteristic that it is well visible in front of the user but is not visible when the viewing angle is increased or is viewed from a distance. do. Alternatively, the liquid crystal display has a characteristic that the screen color is different depending on the viewing angle of the screen. These color characteristics are stored in a table and applied in advance in the hidden mode described below.

For example, if there is a solid background screen 200 as shown in FIG. 2A, and the letter 'ga' 210 is to be displayed on the screen as shown in FIG. 2B, first, as shown in FIG. 2C. As described above, the area 220 occupied by the letter 'ga' in the background screen 200 is extracted and set to a value of '1'. As shown in FIG. 2D, the pixel value 230 of the background screen in the character area, that is, the pixel value of the pixel corresponding to the value of '1' is extracted. In the embodiment of FIG. 3D, it is assumed that the RGB values of the pixels of the region 230 occupied by the characters are (178, 220, 242).

Then, as shown in FIG. 2E, the text area pixel value 230 of the extracted background screen is changed by applying a predetermined offset or a pre-stored similar color table to change the color of the text to match the background screen. Make it 240. In the example of FIG. 2E, the RGB value is changed to (198, 230, 255). The changed RGB value is similar to the RGB value of the background screen, and looks good with the background screen. The offset can be arbitrarily set by the user. In other words, it adjusts the degree of blending with the background screen with an offset. Meanwhile, values of the similar color table may also be stored in advance according to the characteristics of the liquid crystal display, and different values may be applied according to user settings.

As shown in FIG. 2F, the text 240 having the color matched with the background screen is output together with the background screen 200.

3A to 3F are reference diagrams for describing a text message displaying process according to an exemplary embodiment of the present invention when the background screen of the display unit is a color screen including a plurality of colors.

For example, when the letter 'ga' 310 is to be displayed on the multicolored color background screen 300 as shown in FIG. 3A as shown in FIG. 3B, the background is shown in FIG. 3C. The area 320 occupied by the letter 'ga' in the screen 300 is extracted and set to a value of '1'. 3D, the pixel value 330 of the background screen in the set area is extracted.

As shown in FIG. 3E, the color is changed by applying an offset of a predetermined value or a pre-stored similar color table to the pixel value 330 of the extracted background screen to form a character 340 having a color matching with the background screen. The character 340 thus produced is output in combination with the background screen 300 as shown in FIG. 3F.

3G and 3H are reference diagrams for explaining changing pixel values of pixels constituting the character area to match the background screen.

For example, as shown in FIG. 3G, the color of the background screen in the area occupied by the letter 'ga' is displayed in areas 1 350, 2 351, 3 352, and 4 353, respectively. The RGB values of the pixels are (255, 51, 0) in area 1 (350), (178, 220, 242) in area 2 (351), and (200, 100, 50) in area 3 (352). In the case of (252, 254, 160) in the area 4 (353), the result of applying the offset to each pixel value is as shown in Fig. 3H.

That is, the RGB value becomes (255, 71, 20) in the region 1 (351), (198, 230, 252) in the region 2 351, and (210, 120, 70) in the region 3 (352). It can be seen that the area 4 (353) becomes (255, 255, 180). In this case, different degrees of offset may be applied to the R, G, and B values.

4 is a flowchart illustrating a text message display method according to an embodiment of the present invention.

When providing a text editing screen to the user through the display unit of the portable terminal, the user is creating a text through the keypad while watching the input is received (S410). Instead of receiving a text input directly from the user inputs a text message received from the other terminal It may be received (S410). It is determined whether the current state of the mobile terminal is set to the hidden mode (S420), and if the mode is set to the hidden mode, the color of the input text is modified and displayed according to the contents of the hidden mode (S430). When the display mode is changed during the input of the text by being set to the hidden mode, that is, when the hidden mode is canceled (S440), the inputted text is displayed according to the general view mode setting (S450). On the other hand, even if the current state of the terminal is not in the hidden mode in step S420 proceeds directly to step S450, and displays the input character. The normal view mode is a display mode as described with reference to FIGS. 1A-1D.

In addition, even during the display in accordance with the normal view mode setting, when resetting to the hidden mode (S460) (S460), the process proceeds to the above-described step S430 to perform the display of the hidden mode. Hereinafter, the character display process in the sneak mode will be described with reference to FIG. 5.

On the other hand, the display according to the sneak mode may be set to apply only to the character being input, or to apply to all the completed characters.

5 is a flowchart illustrating a text message display method in a sneak mode according to an embodiment of the present invention.

When it is determined that the display of the text is displayed in the hidden mode, the pixel data of the background screen and the text information to be displayed are received (S510). In operation S520, an area occupied by the character to be displayed occupies in the background screen. The pixel value of the background screen of the extracted area is extracted (S530). The pixel value is changed by adding or subtracting an offset to the extracted pixel value or the pixel value is changed according to a table preset according to the characteristics of the liquid crystal display (S540). The change of the pixel value is different when the background screen is a monochrome screen or a color screen including a plurality of colors, and the detailed method of changing the pixel value is as described above with reference to FIGS. 2A to 2F and 3A to 3H. The changed pixel data is output along with the background screen and displayed (S550).

6A and 6B illustrate a text message display screen displayed according to an embodiment of the present invention.

In the case where the background screen 610 is a monochromatic screen composed of one color as shown in FIG. 6A, the color of the character 615 is changed to another similar color as shown in FIGS. 2A to 2F. 615 is displayed. In addition, as shown in FIG. 6B, when the background screen 620 is a color screen composed of various colors, the background screen 620 is combined with the color of the background screen 620 as described above with reference to FIGS. 3A through 3F. The characters 625 are displayed by changing colors respectively.

7 is a block diagram of a text message display apparatus according to an embodiment of the present invention.

The text message display apparatus includes a text area pixel value extractor 710, a pixel value changer 720, a background screen pixel value extractor 730, a synthesizer 740, and a display 750.

The background screen pixel value extractor 730 extracts a pixel value of the background screen displayed on the display unit. The text area pixel value extractor 710 receives a text and extracts and outputs a pixel value of an area occupied by the text on a background screen. The pixel value changing unit 720 changes the color of the text by adding or subtracting a predetermined offset to the pixel value for the text area thus output. The offset can be set by the user arbitrarily.The larger the offset value, the greater the color difference with the background screen, so that it is more likely to be exposed to others, and the smaller the offset value, the smaller the color difference with the background screen. Lose. However, if the offset is too small, it becomes difficult for the user to distinguish the characters. On the other hand, if the offset is added, the color of the text becomes lighter than the color of the background screen, and if the offset is subtracted, the color of the text is darker than the color of the background screen.

The synthesizing unit 740 synthesizes the pixel value of the background screen and the pixel value of the text area to create a screen to be displayed and transmits the screen to the display unit 750. The display unit 750 displays this through a liquid crystal screen.

8 is a block diagram of a mobile terminal having a text message display apparatus according to an embodiment of the present invention.

The mobile terminal includes a keypad 810, a text processing unit 700, a display unit 820, a text message transmitting and receiving unit 830, and a communication unit 840. Others may include a controller, a voice / image processor, and the like, which are not directly related to the gist of the present invention, and thus description thereof will be omitted.

The keypad 810 receives a text message input by the user and transmits the received text message to the text processing unit 700. The communication unit 840 performs a voice call and a text message transmission and reception function in the mobile terminal. The message transmitter / receiver 830 receives the text message transmitted from the counterpart and transmits the received text message to the text processor 700. The text processing unit 700 is configured as shown in FIG. 7, and determines the color of the text based on the text input from the keypad 810 or the pixel value of the text input from the text message transmitting / receiving unit 830 and the background screen. The character is created and output to the display unit 820. The portable terminal may be a mobile communication terminal, a PDA, or the like, and may be any kind of device having a display unit.

On the other hand, the above-described text message display method can be created by a computer program. Codes and code segments constituting the program can be easily inferred by a computer programmer in the art. In addition, the program is stored in a computer readable media, and read and executed by a computer to implement a text message display method. The information storage medium includes a magnetic recording medium, an optical recording medium, and a carrier wave medium.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

As described above, according to the present invention, the message can be checked without disturbing others when creating or receiving a text message, thereby protecting privacy and effectively protecting personal information.

Claims (12)

An input step of receiving a pixel value of a pixel constituting a background screen and a character to be displayed; An extraction step of extracting pixel values of an area occupied by the character in the background screen; A changing step of changing a pixel value by adding or subtracting a predetermined offset to the pixel value of the extracted region; And And displaying the changed pixel value and the pixel value of the background screen. The method of claim 1, wherein said changing step The text area is displayed in a lighter color than the background screen by subtracting a predetermined offset that is changed according to the transparency desired by the user to the pixel value of the extracted area, or the text area is displayed in a color darker than the color of the background screen. Character display method characterized in that the step. The method of claim 1, wherein said changing step And changing the pixel value by referring to a pseudo-color mapping table that collects color data of the same color according to the viewing angle of the display unit in the extracted pixel value. An editing screen providing step of providing a text message editing screen; A display step of receiving a character from a user and displaying the input character in a color similar to a background screen color in a hidden mode and in a predetermined color in a normal view mode; And And a setting change step of displaying a character in a hidden view mode or a normal view mode accordingly when a display mode is changed during input of the character. The method of claim 4, wherein In the sneak mode in the display step, An input step of receiving a pixel value of a pixel constituting a background screen and a character to be displayed; An extraction step of extracting pixel values of an area occupied by the character in the background screen; A changing step of changing a pixel value by adding or subtracting a predetermined offset to the pixel value of the extracted region; And And displaying the changed pixel value and the pixel value of the background screen. A background screen pixel value extractor configured to extract pixel values of pixels constituting the background screen; A text area pixel value extraction unit which receives a text to be displayed and extracts a pixel value of an area occupied by the text in the background screen; A pixel value changing unit for changing a pixel value by adding or subtracting a predetermined offset to the pixel value of the extracted region; A combiner constituting a display screen for synthesizing the changed pixel value and the pixel value of the background screen; And Character display device comprising a display unit for displaying the synthesized screen. The method of claim 6, wherein the pixel value changing unit Character display characterized in that a predetermined offset which is changed according to the transparency desired by the user is made lighter than the color of the background screen in addition to the pixel value of the extracted area, or subtracted to make the color darker than the color of the background screen. Device. The method of claim 6, wherein the pixel value changing unit And changing the pixel value by referring to a pseudo-color mapping table that collects color data of the same color according to the viewing angle of the display unit in the extracted pixel value. A keypad for receiving text input from a user; A text message transmission / reception unit configured to receive a text message from the other party or to transmit a text message to the other party; A text processing unit which extracts an area occupied by a text input from the keypad or a text message transmission / reception unit on a background screen and changes the area according to the pixel value of the background screen; And And a display unit for displaying a character output from the character processing unit. The method of claim 9, The mobile terminal further comprises a communication unit for performing data transmission and reception with the other terminal. 10. The method of claim 9, wherein the character processing unit A background screen pixel value extractor configured to extract pixel values of pixels constituting the background screen; A text area pixel value extraction unit which receives a text to be displayed and extracts a pixel value of an area occupied by the text in the background screen; A pixel value changing unit for changing a pixel value by adding or subtracting a predetermined offset to the pixel value of the extracted region; And And a synthesizing unit configured to output a display screen for synthesizing the changed pixel value and the pixel value of the background screen. A computer-readable recording medium having recorded thereon a program for executing the method according to any one of claims 1 to 3.

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