KR0117399Y1 - Character display device with common character memory - Google Patents

Abstract

The present invention relates to an apparatus for displaying character data stored in a character memory, and more particularly, to a character display apparatus for enabling a character display by sharing two character controllers with one character memory. Conventionally, character data is lost by storing character data used in the same manner when displaying OSD characters or displaying caption characters in different memories, and then reading and displaying the character data by different controllers. Therefore, the present invention stores the OSD text data and the caption text data stored in different memories in one text memory, and transmits the OSD control signal to the text memory during the OSD text display operation. The caption control signal is transmitted to and connected from the character memory, and is configured to use only one character memory, thus providing an advantage of preventing loss of the character memory.

Description

Character display device using shared character memory

1 is a block diagram showing a conventional character display device.

2 is a block diagram showing a character display apparatus using a shared character memory according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

22: OSD Memory Controller 23: Caption Memory Controller

25 control unit 26 selection unit

27: shared character memory 28: mixed part

29: display unit

The present invention relates to an apparatus for displaying character data stored in a rubbish memory, and more particularly, to a character display apparatus enabling two controllers to share a character memory to display corresponding character data. Video equipment such as a video tape recorder (VTR) or a television (TV: Television) can broadcast captions (hereinafter referred to as captions). As caption broadcasting is broadcasted by superimposing caption data on the scanning line of TV signals, it is also used for language study of the hearing impaired, immigrants and students. As an example of caption broadcasting, when watching a foreign movie on a TV or VTR, the function of displaying a sentence corresponding to the dialogue while the movie is in progress is displayed on the screen. In addition, the VTR has an On Screen Display (OSD) function that displays a function selected on the screen for easy identification by the user.

1 is a block diagram showing a conventional character display apparatus. In the first case, when the user presses the PLAY key or the like, the OSD memory controller 12 receives an OSD address corresponding to the play command. The OSD memory controller 12 outputs a control signal for displaying a corresponding OSD character to the OSD character memory 14 according to an authorized OSD address. The OSD character memory 14 outputs the problem data corresponding to the play stored in the predetermined position to the first mixing unit 16 according to the control signal. The first mixing unit 16 receives a video signal from the outside and mixes the OSD signal with the OSD text data to output the second mixing unit 17. On the other hand, the caption memory coroller 13 receives a caption address. The caption memory controller 13 outputs a control command to the caption character memory 15 to output caption character data by the caption address. The caption character memory 15 outputs the corresponding caption character data to the second mixing unit 17. The second mixing unit 17 outputs the output of the first mixing unit 16 (OSD character data) or the output from the caption character memory 15 (caption character data) to the display unit 19 or two signals, respectively. Mixed and output to the display unit 19.

However, in the conventional character display apparatus as shown in FIG. 1, the OSD character memory is used to display the OSD characters, and the caption character memory is separately used to display the caption characters. For example, when displaying a character using an alphabet, an alphabet is stored in the OSD character memory, and an alphabet is also stored in the caption character memory. Then, when the same alphabetic character is to be displayed on the screen, conventionally, alphabetic character data stored from different memories are output separately from the OSD character memory when displaying OSD characters and separately from the caption character memory when displaying caption characters. As a result, character memory was lost by reading and using the same character from different memories.

Accordingly, an object of the present invention is to selectively display the OSD text display or caption text display using a shared text memory in which text data is stored, which can be used for the same purpose when displaying OSD text or caption text. The present invention provides a device for minimizing the loss of memory by displaying on the screen. A feature of the present invention for achieving the above object is a device for displaying a corresponding character data with an image signal according to the character display signal applied from two or more different character controllers, common to two or more different character display A shared character memory for storing the used character data and outputting the corresponding character data when each character display signal is applied; a controller for applying a control signal to select a desired character display signal; And a selector for selecting a character display signal of the controller and outputting the character display signal to the shared character memory.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. 2 is a block diagram showing a character display device representing the device of the present invention. The present invention includes a shared character memory 27. This shared character memory 27 stores character data that is commonly used, such as alphabet, in OSD character display and caption statement display. The output terminal of the OSD memory controller 22 and the output terminal of the caption memory controller 23 are connected to the selector 26. The selector 26 selectively outputs the OSD control signal a of the OSD memory controller 22 and the caption control signal b of the caption memory controller 23 according to the control signal c of the controller 25. . The shared character memory 27 is set as an OSD character memory or a caption character memory according to a control signal applied from the selector 26 to output the corresponding character data e to the third mixing unit 28. The third mixing unit 28 mixes the video signal f from the outside and the OSD characters or caption characters from the shared character memory 28 and outputs them to the display unit 29.

In FIG. 2, when displaying the OSD text, the controller 25 applies a control signal c to the selector 26 to select the OSD control signal a applied from the OSD memory controller 22. The selector 26 outputs an OSD control signal to the shared character memory 27 according to the control signal c. Therefore, the shared character memory 27 receives the OSD control signal from the selection unit 26 and outputs the corresponding problem data to the third mixing unit 28. The third mixing unit 28 receives a video signal from the outside and mixes the video signal with the OSD text data to output it to the display unit 29. In an embodiment, the OSD text is displayed at the top of the screen. Accordingly, the display unit 29 displays OSD text data on the upper portion of the screen.

On the other hand, when the caption character is displayed, the control unit 25 outputs a control signal c to select the caption control signal b of the caption memory controller 23 to the selection unit 26. The selector 26 transfers the caption control signal b output from the caption memory controller 23 to the shared character memory 27 according to the control signal c. The shared character memory 27 receives the corresponding control signal and outputs the corresponding character data to the third mixing unit 28. The third mixing unit 28 mixes the video signal from the outside and the character data applied from the shared character memory 27 to output to the display unit 29. In an embodiment the caption character is usually present in the center of the bottom of the screen. Therefore, the display unit 29 receives the output of the third mixing unit 28 to display the caption character along with the video signal on the screen.

As described above, the present invention is used for displaying characters, but the common data of OSD character data and caption character data stored in different memories are stored in one shared character memory, and the OSD is displayed during the OSD character display operation. It transmits the control signal to the character memory and connects the caption control signal to the character memory during caption character display operation. Therefore, the shared character memory is set to operate as an OSD memory when a signal is input from the OSD memory controller and as a caption memory when a signal is input from the caption memory controller. Therefore, the present invention provides an advantage of preventing the loss of character memory by using only one molecular memory used for the same purpose when displaying OSD characters or caption characters.

Claims (1)

A device for displaying corresponding character data together with an image signal according to a character display signal applied from two or more different character controllers, storing character data commonly used for displaying two or more different characters, and displaying each character display signal. Shared character memory for outputting the corresponding character data when is applied; A control unit for applying a control signal to select a desired character display signal; And a selector for selecting a character display signal of the different character controller according to the control signal and outputting the character display signal to the shared character memory.