JPH06178221A - Television receiver built in teletext broadcast receiver - Google Patents

Abstract

PURPOSE:To display the picture of a teletext onto a liquid crystal display screen while a video image of a television broadcast is displayed on a CRT display screen by providing the liquid crystal display screen in addition to the CRT display screen to the television receiver. CONSTITUTION:The picture of a television broadcast is displayed on a picture tube (CRT) and a teletext signal processing section 7 separates a teletext signal from a video signal of a teletext program selected by a key pad 6 and processed and the picture of the teletext program is displayed on a liquid crystal LCD display processing section and display data are generated in matching with the screen configuration of the LCD and the display data are stored tentatively in a display memory and read in a prescribed display timing and displayed on the LCD via a magnifying lens. For example, when a television broadcast having a title broadcast is selected, a teletext signal processing section 7 detects a teletext signal of a title broadcast and the title is displayed on the LCD via the LCD display processing and the picture of the television broadcast is displayed on a picture tube.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a CRT display screen as well as an L screen.
The present invention relates to a television with a built-in teletext receiver, which has a CD (liquid crystal display) screen and can display teletext on the LCD screen.

[0002]

2. Description of the Related Art In teletext, image information consisting of characters and graphics is transmitted in the form of a digital signal by being multiplexed with a television signal, and the receiving side demodulates this signal and displays it on a television receiver. System. On the receiving side, the character signal is separated from the demodulated video signal, the character signal processing unit performs error correction processing, then the character broadcasting data is decoded, and the pattern data and graphic data read from the character generator are displayed in the display memory. It is written in, converted into a video signal and displayed on a picture tube. There are five display modes for displaying characters and graphics on the display screen: a front fixed display mode, a super fixed display mode, a subtitle display mode, a one-line horizontal scroll display mode, and a full-length vertical scroll display mode. Among the above display modes, those displaying characters and figures with the image of TV broadcast as the background are super fixed display mode, subtitle display mode and 1-line horizontal scroll display mode, and full-length vertical scroll display mode is TV broadcast. The image may be used as the background and the raster may be used as the background. In any of the display modes, there is a problem in that it is difficult to see because the background TV broadcast video is a text broadcast video displayed in an overlapping manner. Further, the front fixed display mode is a display with the raster as the background, and there is a problem that the image of the television broadcast cannot be seen at all. In addition, in order to watch the teletext program in the subtitle display mode, in order to watch the television broadcast, after adjusting the TV channel, switch to the teletext reception mode,
The key operation of "999" and "#" is required, and there is a problem that the operation is difficult to understand.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and by providing an LCD screen in addition to the CRT display screen, the characters of the television broadcast can be displayed on the CRT display screen. It is an object of the present invention to provide a television with a teletext receiver that displays broadcast images on an LCD screen.

[0004]

In order to achieve the above object, a channel selection / IF section for generating and outputting an IF signal after selecting a desired channel from a television broadcast wave, and the IF
A video demodulation unit that demodulates signals, a color demodulation unit that performs color demodulation of demodulated video signals, a switching mixing unit that switches between a TV video signal and a teletext video signal, and an image display that displays TV images, etc. A tube and a keypad for entering commands,
A character signal processing unit that decodes character broadcast data by performing error correction processing after separating a character signal from the video signal demodulated by the video demodulation unit, and a character generator that generates pattern data and graphic data. In a teletext receiver built-in television including a display memory for temporarily storing display image data of teletext and a control unit for controlling each unit, an LCD display processing unit for generating display image data of teletext to be displayed on an LCD. A display memory for temporarily storing image data to be displayed on the LCD, and an LC for displaying the teletext image
And D.

[0005]

With the above construction, the image of the television broadcast is displayed on the picture tube and the image of the teletext is displayed by LC.
The D display processing unit generates a display configuration of a fixed screen according to the LCD screen configuration, for example, display data such as the number of characters displayed in one line and the number of lines in one screen, and stores the display data in a display memory. After being temporarily stored in, the data is read out and displayed at a predetermined display timing. In addition, the LCD display processing unit not only displays a fixed screen, but also generates display data for a scroll display screen, temporarily stores the display data in a display memory, and then reads and displays the display data at a predetermined display timing.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A television with a teletext receiver according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of a television with a teletext receiver according to the present invention.
Reference numeral 1 denotes a channel selection / IF unit that generates and outputs an IF signal after selecting a desired channel from television broadcast waves. Reference numeral 2 is a video demodulation unit that demodulates the IF signal. Reference numeral 3 denotes a color demodulation unit that performs color demodulation on the demodulated video signal. Reference numeral 4 denotes a switching mixing unit for switching between a television video signal and a teletext video signal. Reference numeral 5 is a picture tube (CRT) for displaying television images and the like. 6 is a keypad for inputting commands. A character signal processing unit 7 decodes the character broadcasting data by separating the character signal from the video signal demodulated by the video demodulation unit 2 and then performing error correction processing. Reference numeral 8 is a first display memory for temporarily storing display image data of teletext. An LCD display processing unit 9 generates display image data to be displayed on the LCD. A second display memory 10 temporarily stores image data of teletext displayed on the LCD. Reference numeral 11 is an LCD for displaying a teletext image. 12
Is a character generator that generates pattern data and graphic data. A control unit 13 controls each unit.

FIG. 2 is a table showing a relationship between two types of display screens and modes of the television with a teletext receiver according to the present invention. In mode A, the CRT display displays a teletext and a television broadcast, and displays nothing on the LCD, and operates in the same manner as a conventional television with a built-in teletext receiver. In the mode B, the CRT display displays only a television broadcast, and a new operation of displaying a teletext image on the LCD screen is performed.

The operation of mode B of the television with a teletext receiver according to the present invention will be described. As shown in FIG. 3, while displaying a television broadcast image on a picture tube (CRT) 30, a character broadcast program selected by the keypad 6 is separated by a character signal processing unit 7 from a video signal to generate a signal. The image of the teletext program is processed by the LCD display processing unit,
The display data is generated in accordance with the screen structure of the CD, the display data is temporarily stored in the display memory, and then read out at a predetermined display timing and displayed on the LCD 31 via the magnifying lens. For example, when a television broadcast having a subtitle broadcast is selected, the character signal processing unit 7 detects the teletext signal of the subtitle broadcast, performs the above LCD display processing, displays the subtitle on the LCD 31, and displays the television on the picture tube 30. Display broadcast images. Also, lens, light source, small color LC
D, a screen may be used, and the LCD 11 may be configured by a projection method in which the small color LCD is illuminated from the back with a light source and an image such as a displayed character is displayed on the screen. In the mode A, the same operation as that of the conventional television with a built-in teletext receiver is performed, and the description thereof will be omitted.

[0009]

As described above, according to the present invention, by providing the LCD screen in addition to the CRT display screen, the image of the teletext is displayed on the LCD screen while the image of the television broadcast is displayed on the CRT display screen. Provide a television with built-in teletext receiver. Therefore, it solves the conventional problems that the background TV broadcast image is difficult to see, and that the front fixed display mode is a display with the raster background and the TV broadcast image cannot be viewed at all. In addition, in order to watch the teletext program in the subtitle display mode, simply adjust the TV channel
A receiver that can be easily operated on the D screen can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram of a television with a teletext receiver according to the present invention.

FIG. 2 is a table showing a relationship between two types of display screens and modes of the television with a teletext receiver according to the present invention.

FIG. 3 is an external front view of a television with a teletext receiver according to the present invention.

[Explanation of symbols]

 1 channel selection / IF section 2 video demodulation section 3 color demodulation section 4 switching mixing section 5 picture tube 6 keypad 7 character signal processing section 8 first display memory 9 LCD display processing section 10 second display memory 11 LCD 12 characters Generator 13 Control unit 30 Picture tube (CRT) 31 LCD

Claims (3)

[Claims] 1. A channel selection / IF unit that generates and outputs an IF signal after selecting a desired channel from a television broadcast wave, a video demodulation unit that demodulates the IF signal, and color demodulates the demodulated video signal. A color demodulation section, a switching mixing section for switching between a television video signal and a teletext video signal,
A picture tube for displaying a television image or the like, a keypad for inputting a command, a character signal is separated from the video signal demodulated by the video demodulation section, and error correction processing is performed after decoding the character broadcast data. In a television with a teletext receiver including a text signal processing section, a text generator for generating pattern data and graphic data, a display memory for temporarily storing display image data of teletext, and a control section for controlling each section. An LCD display processing unit that generates teletext display image data to be displayed on the LCD, a display memory that temporarily stores the image data to be displayed on the LCD, and an LCD that displays the teletext image are provided. A television with a teletext receiver, which displays an image based on teletext data on an LCD based on an input command. 2. The television with a teletext receiver according to claim 1, wherein a particular teletext program is detected in a television program display state and the teletext program is displayed on an LCD. 3. The television with a teletext receiver according to claim 1, further comprising a lens for enlarging an image displayed on the LCD.