JPH0965294A - Television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain high definition character information without color slurring due to mis-convergence even around a color cathode ray tube by using a color signal single color conversion circuit so as to represent character information obtained by on-screen or teletext broadcast in a single color of any of three primary red, green and blue colors. SOLUTION: A detector 4 and a color signal monochromatic color conversion circuit 3 shown in figure 1 are connected to a post-stage of a character signal decode section 6 consisting of a character generator 2 and a sub microcomputer 1 and to a video signal processing circuit 5. Thus, a character signal 11 decoded by a character signal decode synchronously with in a detection signal 9 is given to the color signal monochromatic color conversion circuit 3, in which the signal 11 is converted to be displayed in any monochromatic color of any of the three primary red, green, blue signals and then the character information is displayed in a monochromatic color.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color CRT display type television receiver having a function of receiving character multiplex broadcasting and displaying character information and an on-screen display function.

[0002]

2. Description of the Related Art In the recent rapid trend of multimedia, a television receiver realizes a role of displaying and transmitting not only video information up to now but also textual information at low cost and with high accuracy. Is required. With the rapid progress of electronic technology and the needs of users, the information to be processed in television receivers has become extremely diverse, and the technology is rapidly increasing, including the introduction of digital signal processing circuits. Continues to progress. In addition, not only conventional color CRTs but also thin and lightweight display devices are being developed and commercialized. However, its mainstream is still occupied by color cathode ray tubes, and the color cathode ray tubes are also becoming larger in screen size, flattened, and lighter in weight. While increasing the screen size and flattening the view angle, the occurrence of misconvergence around the color cathode ray tube tends to increase. Compared to general video information, in the character information, even in the peripheral portion of the color CRT, unless the accuracy is displayed at a very high level, the color shift is conspicuous and the quality is deteriorated.

[0003]

In the conventional television receiver of the color cathode ray tube display system in which the screen size is increased and the flatness is increased, the color information due to misconvergence is added to the character information displayed in the peripheral portion of the color cathode ray tube. There is a problem that occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a television receiver having a simple circuit configuration and eliminating color misregistration due to misconvergence in the peripheral portion of a color CRT when displaying character information.

[0005]

A teletext signal decoding unit for decoding teletext signals multiplexed in a vertical blanking period of a television signal, and a color signal monochromatic conversion circuit are provided,
Character information by teletext signals and on-screen display characters are displayed in one of the three primary colors of red, green, and blue.

[0006]

According to the television receiver of the present invention, character information display and on-screen display by character multiplex broadcasting are
The color signal monochromatic conversion circuit provides high-quality character information that does not cause color blur due to misconvergence even in the peripheral area of the color CRT by displaying any of the three primary colors of red, green, and blue. can do.

[0007]

1 is a block diagram of a television receiver according to an embodiment of the present invention. In FIG. 1, the same parts as those of the conventional example of FIG. 2 are designated by the same reference numerals and detailed description thereof will be omitted. The configuration of FIG. 1 is a configuration in which a color signal monochromatic circuit 3 is added to the conventional example shown in FIG.

Next, the operation of the above embodiment will be described.
The video signal processing circuit 5, the detector 4, and the main microcomputer 7 are
The operation is similar to that of a conventional television receiver, and the operation will be briefly described along the flow of the signal. The input signal 8 is detected by the wave detector 4 and becomes a detected signal 9. The detection signal 9 is input to the video signal processing circuit 5 and the character signal decoding unit 6. In the video signal processing circuit 5, the detected signal 9 to Y
/ C separation, color difference conversion, matrix conversion, and output RGB signal 10. Further, in the character signal decoding unit 6,
Character information is decoded from the on-screen display character control from the main microcomputer 7 and the detection signal 9 from the detector 4 to generate a character signal 11. Main microcomputer 7
Controls the overall function of the television receiver.

According to the present embodiment, the character signal decoding unit 6
Only the color signal of the character signal 11 from the color signal is converted into the single color of the three primary colors, red, green, and blue by the color signal monochromatic conversion circuit 3 by the control signal 12 from the main microcomputer 7. Of these, only the color signal is converted into a single color. The monochromatic converted character signal 11 is sent to the video signal processing circuit 5, and the video signal processing circuit 5 outputs the RGB signal 10. By the series of processes described above, when character information is displayed, color misregistration due to misconvergence disappears.

[0010]

As is apparent from the above embodiment, the present invention can display on-screen characters and character information at the time of receiving character multiplex broadcasting without color shift due to misconvergence even in the peripheral portion of the color CRT. This has the effect of realizing a color CRT display type television receiver.

[Brief description of drawings]

FIG. 1 is a block diagram of a television receiver according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional television receiver.

[Explanation of symbols]

 1 Sub-microcomputer 2 Character generator 3 Color signal monochromatic conversion circuit 4 Wave detector 5 Video signal processing circuit 6 Character signal decoding unit 7 Main microcomputer 8 Input signal 9 Detection signal 10 RGB signal 11 Character signal 12 Control signal

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Claims (1)

[Claims] 1. A character broadcasting signal decoding unit for decoding a character broadcasting signal multiplexed in a vertical blanking period of a television signal, and a color signal monochromatic conversion circuit, and character information characters and on-screen by a character broadcasting signal. Display characters are red,
A television receiver characterized by displaying in one of the three primary colors of green and blue.