JP2566870Y2 - On-screen display signal generation circuit - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an on-screen display which is used in video equipment such as a color television receiver to display only a border of displayed characters by synthesizing it with a video signal. The present invention relates to a signal generation circuit.

[0002]

2. Description of the Related Art In a conventional on-screen display,
Characters having various colors such as white or red have been inserted at predetermined positions in a video signal. Hereinafter, a conventional on-screen display signal generation circuit will be described with reference to FIG. FIG. 2A is a configuration diagram showing an embodiment of an on-screen display signal generation circuit when a character to be displayed is provided with a border. In the figure, reference numeral 21 denotes a signal for setting a character color and its brightness (hereinafter, referred to as a signal).
A character color / brightness setting signal generating unit (hereinafter referred to as a “character color etc. generating unit”) that generates “character color etc. signal” 31;
Reference numeral 22 denotes a border / brightness setting signal generator (hereinafter, referred to as a "border etc. generating unit") which generates a signal (hereinafter, referred to as a "border etc. signal") 32 for setting a character border and the brightness of the border. Is a switching signal generator for switching between the following first and second switching circuits at a predetermined timing to insert a character signal into a predetermined position of the video signal 33, 24 is a first switching circuit, and 25 is a second switching circuit. The switching circuit 26 is a microcomputer.

An instruction is issued from the microcomputer 26 as to which character of the video signal 33 is to be combined with which character. Based on this command, the character color etc. generating section 21 outputs a character color etc. signal 31 and the border etc. generating section 22 outputs a border etc. signal 32 to the first switching circuit 24, respectively. The signal selected by the first switching circuit 24 is transferred to the second switching circuit 25, where it is switched to the video signal 33. The switching signal generator 23 generates a signal for switching the first switching circuit 24 and the second switching circuit 25 at a predetermined timing (a first switching signal 34 and a second switching signal 35). By this switching, a framed character signal is inserted at a predetermined position of the video signal. The insertion position of the character signal is determined based on the horizontal synchronization signal 36 and the vertical synchronization signal 37. Therefore, the horizontal synchronizing signal 36 and the vertical synchronizing signal 37 and the position designation data 38 from the microcomputer 26 are input to the switching signal generator 23, and the first switching signal 34 and the second switching signal 35 Occurs.

When there is no command for on-screen display, the second switching circuit 25 passes the video signal 33 to the output terminal 39 as it is while maintaining the position a. When there is an instruction for on-screen display, the second switching circuit 25 is at the a-side position except for the position where the character is to be inserted, and passes the video signal 33 to the output terminal 39 as it is. When the designated position is reached, the second switching circuit 25 is switched to the side b by the second switching signal. On the other hand, when there is an on-screen display command, the border etc. generating unit 22 and the character color etc. generating unit 21 output the bordering etc. signal 32 and the character color etc. signal 31 of the designated character, respectively. The first switching signal 34 causes the first switching circuit 24 to execute c → d → c
And switch. This switching produces a portion of bordered and colored characters. This operation is repeated according to the form of the character to complete one character. Then, this character signal is supplied to the output terminal 39 via the terminal b of the second switching circuit 25.
Output in place of the video signal. That is, the character is inserted at a predetermined position in the video signal. FIG. 2B shows “bordering and the like” and “character color and the like” in the above description.

[0005]

In the conventional on-screen display, a video signal component is cut in a character portion as described above. That is, the video signal of the cut portion cannot be seen. When the display character is large, the part that cannot be seen naturally becomes wide. SUMMARY OF THE INVENTION It is an object of the present invention to provide an on-screen display signal generating circuit that displays only a border portion of a character so as to minimize the above-described cut of a video signal even when performing on-screen display. .

[0006]

According to the present invention, there is provided a means for generating a switching signal determined from a horizontal synchronization signal, a vertical synchronization signal, and on-screen display position designation data, and borders on-screen display characters with a predetermined brightness. Another object of the present invention is to provide an on-screen display signal generating circuit comprising means for switching between a character border signal and a video signal in accordance with the switching signal. A switching circuit for switching between a character signal and a video signal having predetermined brightness and color; a first switching signal and a second switching signal determined from a horizontal synchronization signal, a vertical synchronization signal, and on-screen display position designation data. A first switching unit for switching a signal selected by the switching circuit and a character bordering signal for bordering on-screen display characters with a predetermined brightness in accordance with the first switching signal;
The signal selected by the first switching means and the video signal are
And an on-screen display signal generating circuit comprising a second switching means for switching in accordance with the switching signal.

[0007]

Only the border signal and the like described above are inserted into a video signal, and the signal portion such as a character color is converted into a video signal. Then, a video signal and a signal such as a border are switched so as to be like that.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an on-screen display signal generating circuit according to the present invention will be described with reference to the drawings. FIG. 1A is a main block diagram showing an embodiment of an on-screen display signal generation circuit according to the present invention, and FIG. 1B is a main block diagram showing another embodiment of the present invention. In FIG. 1A, the same components as those in FIG. 2A are denoted by the same reference numerals, 1 is a switching signal generator (switching signal generating means of claim 1), and 2 is a switching circuit (switching of claim 1). Means). FIG.
In FIG. 2B, those equivalent to those in FIG. 2A are given the same reference numerals, and 3 is a switching circuit.

First, FIG. 1A will be described. It should be noted that the description of the parts overlapping with FIG. 2A is omitted, and the same terms are used. The switching circuit 2 is a second switching circuit 25 shown in FIG.
, But with a different switching timing. As shown, a video signal 33 and a framing signal 32 from the framing generator 22 are added to the switching circuit 2. The switching signal generator 1 generates the switching signal 11 for switching the switching circuit 2 at a predetermined timing. The reference of the switching timing is the position designation data 38 from the microcomputer 26, the horizontal synchronizing signal 36 and the vertical Sync signal
37 is the same as that in FIG. The difference between the switching operation of the switching circuit 2 in FIG. 1A and the switching operation of the switching circuit 25 in FIG. Is to select the signal. That is, the signal such as the character color in the case of FIG.
A video signal is selected instead of 31. The switching signal 11 is a signal for switching in this manner. By performing the switching as described above, the composite video signal which is a video signal other than the border portion of the character is output to the output terminal 39.

Next, FIG. 1B will be described. FIG.
The embodiment shown in FIG. 1B allows the user to select the function of FIG. 1A and the function of the prior art described with reference to FIG. 2A. In other words, if the switching circuit 3 for the user to perform the switching operation is provided and the switching circuit 3 is set to the side a,
The function is the same as that of FIG. 1A, and the function of FIG. In the case of the a side, the inside of the border portion becomes a signal 31 such as a character color as in FIG. 2A, and on the b side, the inside of the border portion becomes a video signal as in FIG. 1A. Therefore, the first switching signal 34 for the first switching circuit 24 (first switching means of claim 2) for switching between the bordering signal 32 and the character color signal 31 (or the video signal 33) is shown in FIG. )). Further, the second switching signal 35 for switching the second switching circuit 25 (second switching means in claim 2) for inserting a character signal into a video signal is the same as that in the case of FIG.

[0011]

According to the present invention, as described above, the video signal is also projected inside the previously filled on-screen display characters, so that the previously invisible part can be seen. The amount of minute information increases, and the effect is remarkable especially when the character is large.

[Brief description of the drawings]

FIG. 1 is a main block diagram showing one embodiment (A) of an on-screen display signal generation circuit according to the present invention and another embodiment (B).

FIG. 2A is a main block diagram showing an embodiment of a conventional on-screen display signal generation circuit, and FIG. 2B is an explanatory diagram of on-screen display.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 switching signal generator 2 switching circuit 3 third switching circuit 21 character color / brightness setting signal generating section 22 border / brightness setting signal generating section 23 switching signal generating section 24 first switching circuit 25 second switching circuit 26 Microcomputer

Claims (2)

(57) [Scope of request for utility model registration] 1. A means for generating a switching signal determined from a horizontal synchronizing signal, a vertical synchronizing signal, and on-screen display position designation data, and a character bordering signal for bordering on-screen display characters with a predetermined brightness and a video signal. Means for switching in accordance with the switching signal. 2. A switching circuit for switching between a character signal and a video signal having predetermined brightness and color, a first switching signal determined from a horizontal synchronization signal, a vertical synchronization signal, and on-screen display position designation data, and a second switching signal. And a first switching means for switching a signal selected by the switching circuit and a character border signal for bordering on-screen display characters at a predetermined brightness in accordance with the first switching signal. ,
The signal selected by the first switching means and the video signal are
And a second switching means for switching in accordance with the switching signal.