KR960000278B1 - Osd apparatus using teletext - Google Patents

Abstract

a microcomputer for outputting letter data, location data, and read/write command; a register for storing a data value from the microcomputer and separating the location data value from the letter data value; an address decoder for decoding the location data value outputted from the register; a control letter detecter for outputting a control signal by receiving the letter data value and by checking the inputted value; an address counter for outputting an address value by receiving the location data from the address decoder and by counting the address according to the control signal of the control letter detecter; a control letter memory controller for storing output data of the register in a control letter memory during the writing command, and reading the data stored in the control letter memory during the reading command; a normal memory controller for storing the output data from the register in a normal letter memory during the writing command, and outputting the data stored in the normal letter memory controller; and a letter output logic for outputting the outputs of the normal and control letters through the normal and control letter memory controllers with designated colors.

Description

On-screen display device using text broadcasting

1 is a block diagram showing an on-screen display device in a conventional video device.

2 is a block diagram of an on-screen display device using teletext broadcasting according to the present invention.

* Explanation of symbols for main parts of the drawings

11: microcomputer 12: register

13: address decoder 14: address counter

15: control character detector 16: normal character memory controller

17: normal character memory 18: character address decoder and character ROM

20: second latch portion 21: control character memory controller

22: control character memory 23: control character decoder

24: first latch portion 25: output logic

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an On Screen Disply (OSD) device using teletext, and in particular, when specifying a color of a character to be displayed or a background color, a normal color is not changed at a position where color characters are written. The (Normal) character is suitable for displaying.

In general, 8 control characters (color designation character, background designation character, etc.) can be designated during on-screen display using text multicasting, and 24 rows and 40 columns can be displayed on one screen. Various information can be displayed.

At this time, the character specifying the color also occupies a position on the screen and is displayed as a space.

The configuration of the on-screen display device using the conventional text multiplexing is shown in FIG.

That is, the microcomputer 1 for outputting the position to be displayed and the character data, the address decoder 3 for decoding the position data input to the register 2 in which the positional data to be displayed and the character data are recorded, and the register The output of (2) and the memory data to which character data and characters of the address decoder 3 are written are transferred, the memory controller 4 which controls the input / output of normal characters, and the normal characters (normal characters) connected to the memory controller 4. A memory address for storing the data, a character address decoder 6 and a control character decoder 7 receiving character data from the memory controller 4 during a read cycle, and the two decoders 6 ( 7) and multiplexer logic 8 for receiving the character dot and the control character factor signal corresponding to the address and outputting the corresponding color.

Referring to the conventional operation configured as described above, when displaying a character, first, the position data and the character data to be displayed on the microcomputer 1 are input to the register 2.

Thus, the position data input to the register 2 is decoded via the address decoder 3 and transferred to the memory controller 4 at the memory address where the character is to be written.

Character data is also transferred to the memory controller 4.

At this time, the memory controller 4 writes the character data at the designated address at the write cycle, and transfers the character data to the character # decoder 6 and the control character decoder 7 at the read cycle.

Therefore, the character address decoder 6 transfers the character dot corresponding to the address to the multiplexer logic 8.

In addition, according to the signal of the line X, the multiplexer logic 8 outputs a space in the color inputted to the line Y if the control character is used, and outputs the dot inputted to the line Y as the normal character. .

However, in the conventional on-screen display device as described above, since the control character specifying the color must be written before the normal character in order to specify the color, the position where the control character is written is displayed as a space.

Here, writing normal characters where control characters are written changes the color because the color specification is lost.

Therefore, there was a drawback that the normal characters cannot be displayed without changing the color at the position where the color characters are written.

In other words, there is a drawback that a character cannot be displayed at that position because the control character is displayed as a space in the on-screen display using conventional teletext.

The present invention is to solve the above-mentioned shortcomings, the input character is separated and stored according to the control character or normal character, and read the separated and stored data at the same time to change the control of the character and display normal characters, It is an object of the present invention to provide an on-screen display device capable of displaying normal characters without changing the control of the characters unless they are control characters.

In order to achieve the above object, an on-screen display device using text multicasting according to the present invention includes a microcomputer for outputting text data to be displayed, a position data value to be displayed and a read / write command, and a data value output from the microcomputer. A register for storing and outputting a position data value and a character data value separately, an address decoder for decoding the position data value outputted from the register, and receiving a character data value from the register to determine whether a control character or a normal character is obtained. A control character detector for outputting a control signal, an address counter for receiving the decoded position data from the address decoder and counting an address for each character according to the control signal of the control character detector, and outputting an address value; The above instruction Stores the output data of the register in the control character memory at the address counter value when the control character is detected as a control character from the character detector, and when the control character detector is detected as the control character at the write command of the microcomputer. And a control character memory controller that sequentially reads and outputs data stored in the control character memory from the beginning during a read command and, when detected as normal characters from the control character detector during a write command of the microcomputer, the address data value of the address counter. A normal character memory controller which stores data output in the register at a position in a normal character memory and sequentially reads and outputs data stored in the normal character memory from the beginning in a read command; Configured to include the character output through the logic for re controller receives the output of the normal character and control character outputting a character to a given color (R, G, B) has its features.

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

2 is a block diagram of an on-screen display device using the character multicasting of the present invention.

The on-screen display device using the character multicasting of the present invention includes a microcomputer 11 for outputting character data to be displayed, a position data value at which the character is to be displayed, and a read / write command, and an output from the microcomputer 11. A register 12 for storing a data value and separately outputting a position data value and a character data value, an address decoder 13 for decoding the position data value output from the register 12, and the register 12; A control character detector 15 that determines whether a control character or a normal character is received and outputs a control signal, and receives the decoded position data from the address decoder 13 to control the control character detector 15. Normal character memory controller 16 and control character memory controller by counting addresses for each character (control character / normal character) according to the signal An address counter 14 which transmits an address value to 21 and a write character according to the control of the control character detector 15 at the time of a recording command in accordance with a read or write command of the microcomputer 11; The input data from the register 12 is stored in the control character memory 22 at the address data value position of 14), and the data stored in the control character memory 22 is sequentially read from the beginning and outputted at the time of the diary command. The control character memory controller 121, the control character memory 22 for storing the control character data, and the control character detector 15 at the time of the write command in accordance with the read or write command of the microcomputer 11; According to the normal character, the data output from the register 12 is stored in the normal character memory 17 at the address data value position of the address counter 14. A normal character memory controller 16 that sequentially reads and outputs data stored in the database 17 from the beginning, a normal character memory 17 that stores the normal character data, and data in the normal character memory 17. Is inputted through the normal character memory controller 16 and decodes a character address decoder and a character ROM (ROM) 18, and a second latch unit 20 latching the decoding values of the character address decoder and the character ROM 18. And a control character decoder 23 for receiving and decoding the control character data in the control character memory 22 through the control character memory controller 21, and the control character decoded by the control character decoder 23. And a first latch portion 24 for latching, and an output logic 25 for receiving the outputs of the first and second latch portions 24 and 20 and outputting a character to a designated color (R, G, B). .

When the present invention configured as described above is divided into a process of writing character data into a memory or a buffer and a process of reading the written data and outputting the character dots to R, G, and B as follows.

First, referring to the process of writing character data into the normal character memory 17 and the control character memory 22, the character to be displayed on the microcomputer 11 and the position data value at which the character is to be written are transferred to the register 12. do.

At this time, when displaying data continuously, the position data value is transmitted only once, and only after that, the character data value is transmitted.

In the register 12, the position data is transmitted to the address decoder 13, and the character data is transmitted to the control character detector 15, the control character memory controller 21, and the normal character memory controller 16. 13, when data is transmitted from the register 12, the data is decoded and transferred to the address counter 14.

The address counter 14 transmits the input position value to the control character memory controller 21 when the control character is input according to the control signal of the control character detector 15 and increases the control character memory position value.

At this time, the control character memory controller 21 stores the character data input from the register 12 in the control character memory 22 according to the position value designated by the address counter 14.

On the other hand, when the normal character is input from the control character detector 15, the address counter 14 transmits the input position value to the normal character memory controller 16 and transmits the control character memory position value and the normal character memory position value, respectively. Increment by 1

At this time, the normal character memory controller 16 stores the normal character data input from the register 12 in the normal character memory 17 according to the position value designated by the address counter 14.

Repeat the above procedure for as many characters as you want to display.

Hereinafter, a process of outputting character dots by reading the written data will be described.

First, the control character controller 21 reads the data at the first position from the control character memory 22 and outputs it to the control character decoder 23.

Therefore, the control character decoder 23 decodes the input data and outputs color values and the like to the first latch unit 24. At the same time, the normal character memory controller 16 stores data at the first position in the normal character memory 17. Is read and output to the character address decoder and the ROM 18.

The character address decoder and character string 18 decodes the character data address of the character ROM and transfers the dot value at the position to the second latch unit 20.

The data latched and output by the first and second latch units 24 and 20 is input to the output logic 25.

The output logic 25 outputs the character dots input from the second latch portion 20 in R, G, and B colors according to the color designation input from the first latch portion 24, and reads these operations to the memory end position. Repeat every cycle.

The present invention as described above can be displayed without a space while changing the color of the characters at the time of on-screen display using the character multicasting can solve the problem that the conventional control characters can not be a space, accordingly various There is an effect that the on-screen display can be realized.

Claims (2)

A microcomputer for outputting the character data to be displayed, the position data value to be displayed and a read / write command, a register for storing the data value output from the microcomputer and separating and outputting the position data value and the character data value; An address decoder which decodes the position data value outputted from the receiver, a control character detector which receives a character data value from the register and determines whether it is a control character or a normal character and outputs a control signal, and receives the decoded position data from the address decoder An address counter for counting an address for each character according to a control signal of the control character detector and outputting an address value; if the control character is detected from the control character detector during a recording command of the microcomputer, the address data value position of the address counter Above regis A control character memory controller for storing the output data of the control character memory and sequentially reading and outputting the data stored in the control character memory from the beginning in a read command, and from the control character detector to a normal character in a write command of the microcomputer. A normal character memory controller which stores the data output in the register in the normal character memory at the address data value position of the address counter and detects and sequentially reads the data stored in the normal character memory from the beginning when read command; Voice multicasting characterized in that it comprises a character output logic for receiving the output of the normal characters and control characters through the normal character memory controller and the control character memory controller and outputs the characters in a specified color (R, G, B) On-screen display device . The character output logic of claim 1, further comprising: a character address and a character ROM for receiving and decoding normal characters through the normal character memory controller, a second latch unit for latching decoding values of the character address decoder and the character ROM; A control character decoder for receiving and decoding control character data through the control character memory controller 21, a first latch unit for latching a control character decoded by the control character decoder, and outputs of the first and second latch units. And an output logic for receiving a character in a designated color (R, G, B).