KR0123758B1 - On screen display character processing circuit & method to be completed an association pattern - Google Patents

Abstract

The present invention relates to a combined OSD text processing circuit and method for displaying OSD text on a screen using text ROM.

More specifically, the Hangul fonts stored in the character ROM are combined, and when the character to be displayed is determined by the remote control or key matrix, the position of the character to be displayed and the number of characters are read from the table mapped in the program ROM. Load the number of characters in column 1 in and variable 1, load the number of characters in column 2 in variable 2, address the characters to display in the character ROM, store them in video RAM, and reduce the variable 1 to 1 on the screen. By displaying the corresponding character in one column at the corresponding position in the column and displaying the corresponding character in the second column at the corresponding position in the second column on the screen while reducing the variable 2, the size of the character ROM can be reduced and the cost is reduced. It is possible to express various Hangul characters using the character ROM.

Description

Combination type on screen display character processing circuit and method

1 is a view showing an embodiment in which a conventional Korean font is stored in a character ROM.

2 is a view showing an embodiment in which a combined Hangul font according to the present invention is stored in a character ROM.

3 is a table showing an embodiment in which information for performing the on-screen display character processing method of the combination type according to the present invention is mapped to a program ROM.

4 is a flowchart for carrying out the method for processing on-screen display characters in combination according to the present invention.

* Explanation of symbols for main parts of the drawings

100: character ROM 200: video RAM

CPU: Central Processing Unit

The present invention relates to a television and video cassette recorder (hereinafter referred to as a VCR) having an On Screen Display function (hereinafter referred to as an OSD), and more particularly to a Hangul in combination with a character ROM. The present invention relates to a processing circuit and a method for processing OSD characters in a combination type which saves fonts and displays them on the screen with an OSD function, thereby reducing the overall size of the character ROM and limiting the number of displayed characters.

In conventional TVs and VCRs, when a character is displayed on the screen by the OSD function, the Korean font of the completed type is stored in the character ROM.

FIG. 1 is a diagram showing an embodiment in which such a complete Hangul font is stored in a text ROM, and the ROM 10 stores a Complete Hangul font. At this time, when the video RAM 20 outputs an address to the text ROM 10 under the control of the CPU, the text ROM 10 stores the text font stored at the address. ) The video RAM 20 receives information on the character position to be displayed, the number of characters, etc. from the CPU, and displays the characters read from the character ROM 10 on the CRT.

At this time, since the completed Hangul font stored in the character ROM 10 is a perfect character, all the characters necessary to express the Hangul should be stored in the character ROM 10. Therefore, when the size of the character ROM 10 is small, it is impossible to represent all the desired Hangul. That is, there is a problem in that the number of characters to be displayed is limited according to the size of the character ROM 10.

The present invention is to solve such a problem, the object of the present invention is to combine the form of the Hangul font stored in the character ROM in a combination type to be able to express the desired Hangul freely without large limitation on the size of the character ROM It is to provide a processing circuit of the OSD character.

Another object of the present invention is to provide a method of processing a combination OSD text that allows two columns to display all the combination characters.

In order to achieve the above object, a feature of the present invention is that a character ROM in which a Korean font is displayed to be displayed by an OSD function, a central processing unit outputting a control signal, and a character to be displayed on the screen are read from the character ROM. And a video RAM for displaying on the CRT, wherein the Hangul font is stored in a combination form in the character ROM, and one completed character is represented using two columns. It is in the processing circuit.

Another feature of the present invention is that, when the character to be displayed is determined by the remote controller or key matrix, the position on the screen, the number of characters, etc. of the character to be displayed are read from the table mapped in the program ROM, and the variable 1 character corresponds to the first column. Loading the number of characters, loading the number of characters in column 2 into variable 2, addressing the characters to be displayed in the character ROM, and storing them in the video RAM, and reducing the variable 1 to one row in the corresponding position on the screen. The present invention relates to an OSD character processing method of a combination type consisting of displaying a corresponding character and displaying the corresponding character in two columns at a corresponding position on the screen while decreasing the variable 2.

Hereinafter, with reference to the accompanying drawings an embodiment according to the present invention will be described in detail.

2 is a view showing an embodiment in which a combined Hangul font according to the present invention is stored in a character ROM, a character ROM 100 in which a combined Hangul font is stored, a central processing unit (CPU) for outputting a control signal, and The video ROM 200 is configured to output an address to the text ROM 100, read the characters to be displayed, combine them into a completed Korean form, and display the video on the CRT.

In this case, an address bus and a data bus are connected to the text ROM 100 and the video RAM 200, so that the video RAM 200 receives an address from the text ROM 100. The text ROM 100 outputs text data to be displayed on the CRT to the video RAM 200.

3 is a table showing an embodiment in which information for performing the combined OSD character processing method according to the present invention is mapped to a program ROM, in which one completed character (corresponding to one line) has two columns. Can be expressed using Therefore, in the program ROM, the number of characters to be displayed in the first column and the character address in the character ROM and the number of characters to be displayed in the second column and the character address in the character ROM are mapped to each line.

4 is a flowchart for performing the on-screen display character processing method of the combination type according to the present invention, in which a key is input from a key panel or a remote control attached to a television or a VCR, and displayed on the screen by a central processing unit (CPU). When the OSD character to be displayed on the screen is determined, the step 401 of reading the position and the number of characters to be displayed on the screen from the program ROM, and the variable 1 (Ch-num1) indicate the number of characters to be displayed in the first column. In step 2 402, the number of characters to be displayed in the second column and the characters to be displayed on the screen are stored in the video RAM 200 in the variable ROM (Ch-num2). Step 403, a step 404 of displaying the corresponding character in one column at a corresponding position in the first column on the screen, decrementing variable 1 by one, and determining whether variable 1 (Ch-num1) is 0, and , Variable 1 (Ch-num1) is 0 If it returns to the step 404, and continues to display the characters corresponding to the first column, 0 means that all the characters corresponding to the first column are displayed, so that the corresponding characters of the second column are displayed at the corresponding positions of the second column on the screen and the variable 2 ( Step 406 of decrementing Ch-num2) and determining whether variable 2 (Ch-num2) is 0, and if 0 means that all the characters corresponding to the second column are displayed, to display the next line of characters. Step 407 is performed in order to branch to the program ROM table containing the information of the next line and to return to step 406 if not zero.

According to the present invention configured as described above, the Hangul characters displayed by the OSD function on the screen are stored in the character ROM 100 in a combined form.

At this time, the character font, character position, number of characters, etc. to be displayed on the screen by the OSD function are predetermined, and the character to be displayed is determined according to a key signal input through a key panel or a remote controller attached to the television.

That is, when the user presses the channel number to switch channels, the channel number is displayed on the screen, and when the volume up key is pressed to increase the volume, the volume up state is displayed by the OSD function.

At this time, since the Hangul font stored in the character ROM 100 is in the form of a combination type, it is possible to display all combination characters using two columns.

That is, suppose that the invention report is displayed on the screen using the OSD function.

Row 1: Bar and Poetry

Row 2: ㄹ ㅇ ㄴ ㅗ

At this time, if you want to display characters that can be represented by three columns such as', 'or', ',' ㅇ '+' 'Or' ㄴ '+' Create new fonts and store them in the character ROM 100 and address them if necessary and display them on the screen.

Therefore, when the character to be displayed by the OSD function is determined as the 'invention report', the CPU reads the position, the number of characters, etc. of the 'information report' from the table mapped to the program ROM (401). ).

The variable 1 (Ch-num1) is loaded with the number of characters displayed in one column, and the variable 2 (Ch-num2) is loaded with the number of characters displayed in the second column (402).

That is, 9 is loaded into variable 1 (Ch-num1) and 4 is loaded into variable 2 (Ch-num2).

When the video RAM 200 outputs an address to the text ROM 100, the text ROM 10 outputs the text font stored at the address to the video RAM 200. Accordingly, the following character font is stored in the video RAM 200 (403).

Column 1: 'ㅂ' + 'ㅏ' + 'ㅁ' + 'ㅕ' + 'ㅅ' + 'ㅣ' + 'ㄱ' + 'ㅅ' + 'ㅓ'

Column 2: '' + 'ㄹ' + '' + 'ㅇ' + '' + 'ㄴ' + 'ㅗ' + '' + ''

Then, one corresponding character of the first column is displayed at the corresponding position of the first column on the screen, the variable 1 (Ch-num1) is reduced by one (404), and it is determined whether the variable 1 (Ch-num1) is 0 (405). .

At this time, if the variable 1 (Ch-num1) is not 0, it means that there are remaining characters to be displayed in column 1, and the steps 404 and 405 are repeated. Then, when variable 1 (Ch-num1) becomes 0, it indicates that all the characters corresponding to column 1 (that is, 'ㅓ') are displayed. Therefore, the corresponding character of column 2 is displayed at the corresponding position of column 2 on the screen. Decreases one (Ch-num2) by one (406).

Then, it is determined whether the variable 2 (Ch-num2) is 0 (407). At this time, if the variable 2 (Ch-num2) is not 0, it means that there are more characters to be displayed in the second column, so the steps 406 and 407 are repeated, and when the variable 2 (Ch-num2) is 0, the second column is displayed in the second column. This completes the display of characters for one line, indicating that all the corresponding characters (ie 'ㅗ') are displayed. At this time, if there is a character to be displayed on the next line, the program branches to a program ROM table that contains information on the next line.

As described above, according to the OSD character processing circuit and method according to the present invention, the font of the Korean characters to be displayed by the OSD function is promoted to the character ROM in a combination type, and one completed character is displayed using two columns. By doing so, it is possible to reduce the size of the character ROM, thereby reducing the cost, and it is also possible to express various Hangul characters by using a small character ROM.

Claims (2)

OSD character processing consisting of a character ROM that stores Korean fonts to be displayed by the OSD function, a central processing unit that outputs a control signal, and a video RAM that reads the characters to be displayed on the screen from the character ROM and displays them on the CRT. The circuit according to claim 1, wherein the Hangul font is stored in the text ROM in a combination form, and one completed character is represented using two columns. When the character to be displayed is determined by the remote control or key matrix, the position of the character to be displayed, the number of characters, etc. are read from the table mapped in the program ROM, and the number of characters corresponding to column 1 is loaded in variable 1, and the variable 2 in column 2 is read. Loading the corresponding number of characters, addressing the characters to be displayed in the character ROM and storing them in the video RAM, decreasing the variable 1 and displaying the corresponding character in the first column at the corresponding position in the first column on the screen, A method of processing OSD characters in a combination, comprising reducing the display of the corresponding two columns of characters at the corresponding positions of two columns on the screen while reducing them.