JPH03224373A - Television receiver - Google Patents

Abstract

PURPOSE:To effectively utilize the entire screen and to prevent partial deterioration of the fluorescent screen due to fatigue or the like by forming a 2nd screen whose aspect ratio is 4:3 onto a 1st pattern at the reception of an NTSC broadcast, dividing a remaining area of the 1st screen into plural 3rd screen whose aspect ratio is 4:3 and displaying the content of a character broadcast onto the 3rd screen. CONSTITUTION:A screen 1 is used for High Vision whose aspect ratio is 16:9. When the screen 2 for normal broadcast of the NTSC system whose aspect ratio is 4:3 is placed in the middle of the pattern 1, non-video image sections 3, 4 are caused at both sides. Then the non-video image sections 3, 4 are divided longitudinally into 6 to form slave screens 5-10, 11-16 whose aspect ratio is 4:3. Then the content of the character broadcast is displayed on the slave screen 5-10 and 11-16. An NTSC system composite video signal inputted to a composite video signal input terminal 21 is demodulated/reproduced at a video reproduction circuit 22 and sent to a CRT 24 via a synthesis circuit 23 as an RGB signal and displayed in the middle screen 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a television receiver capable of receiving high-definition broadcasting, and more particularly to a television receiver capable of receiving both normal broadcasting and high-definition broadcasting of the NTSC system.

[Conventional technology]

A TV receiver that can receive high-definition broadcasting has a screen aspect ratio of 16=9, so if it is made compatible to receive regular NTSC broadcasting with an aspect ratio of 4:3, the side A non-image area is generated in the area.

[Problem to be solved by the invention]

For this reason, the degree of fatigue of the fluorescent surface differs between the non-image area and the image area of the screen during normal broadcasting, resulting in various inconveniences.

An object of the present invention is to effectively utilize the non-video portion of the screen during normal broadcast reception to avoid the above-mentioned problems.

[Means to solve the problem]

To this end, the present invention provides a television receiver having a first screen with an aspect ratio of 16:9, in which a second screen with an aspect ratio of 4:3 is formed on the first screen when receiving NTSC broadcasting, and The remaining area of the second screen is divided into a plurality of third screens with an aspect ratio of 4:3, and the content of the teletext is displayed on the third screens.

〔Example〕

Examples of the present invention will be described below. FIG. 1 is a diagram showing a screen 1 of a television receiver according to one embodiment. This screen 1 is for high vision with an aspect ratio of 16=9. Therefore, if a screen 2 for normal broadcasting of the NTSC system with an aspect ratio of 4:3 is positioned in the center of this screen 1, non-video portions 3.4 are generated on both sides thereof. but,
By dividing this non-video area 3.4 into 6 parts in the vertical direction, the sub-screens 5 to 10 and 11 to 16 with an aspect ratio of 4=3 are created.
can be formed. Therefore, in this embodiment, the contents of the teletext broadcast are displayed on the child screens 5 to 10 and 11 to 16.

FIG. 2 is a block diagram for this teletext display.

The NTSC composite video signal input to the composite video signal input terminal 21 is demodulated/reproduced by the video reproducing circuit 22, and sent as an RGB signal via the combining circuit 23 to the CRT 2.
4, where it is displayed on screen 2 in the center of FIG. Further, the teletext signal in the vertical retrace period inputted to the composite video signal input terminal 21 is reproduced by the video reproducing circuit 22, decoded by the teletext decoder 25, and R
The video signal is converted into a video signal consisting of GB signals and taken into the synthesis circuit 23. Then, on the CRT 24, it is displayed on any of screens 5 to 16 in FIG. 26 is a memory for storing teletext data.

The teletext can be displayed on the screens 5 to 16 by using blanking periods at the beginning and end of horizontal scanning. That is, by synthesizing the character signals from the teletext decoder 25 in the synthesis circuit 23 during this blanking period, the teletext can be displayed on the screens 5 to 16.

In this teletext display, a total of 12 screens can be displayed on screens 5 to 16. Therefore, if there are less than 12 teletext programs on a particular channel, the first page of the program can be displayed separately on the individual screens 5 to 16. Then, move the pointer 17 on screen 2 using the cursor keys on the remote control transmitter (not shown) to select a specific screen from screens 5 to 16, and select the program displayed on the selected screen. The first page can be displayed in a large size on the screen 2, and thereafter, other pages of the program can be sequentially displayed on the screen 2.

If there are more than 12 programs, all the programs can be displayed by displaying the first page of each program on screens 5-16 and scrolling the screens 5-16. In this case as well, a specific program can be designated and displayed on the screen 2 using the pointer 17. Another display method when there are more than 12 programs is to display a total of 12 programs on each screen 5 to 16, and for the programs that could not be displayed, display the already displayed screens 5 to 16 as page turns. Depending on the method, the display can be changed and displayed every predetermined time period.

FIG. 3 is a diagram showing another display mode of the teletext screen.

Here, the screen 2 with an aspect ratio of 4:3 is moved to the left, and three screens 18 to 20 with an aspect ratio of 4=3 are formed on the right side. In this case, since it can be displayed relatively large, it can be used as it is as a teletext screen by combining known scanning line interpolation processing, double speed scanning processing, etc.

Furthermore, if screens 5 to 16 shown in Fig. 1 are combined with the above-mentioned scanning line interpolation processing, double-speed scanning processing, etc., they can be used not just for searching but for regular teletext display. You can also do that.

[Effects of the Invention] As explained above, according to the present invention, a teletext screen is generated in the area that remains when an NTSC screen is displayed on a high-definition screen. Since the remaining area is used and the entire screen can be used in the same way, partial deterioration etc. can be prevented, and
Since the above-mentioned remaining area can be separated with an aspect ratio of 4:3, a plurality of teletext screens can be displayed in that portion, and there is an advantage that it can be used as is or as a guide for selecting teletext programs.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of how the screen of a television receiver according to an embodiment of the present invention is divided, FIG. 2 is a schematic block diagram of a circuit for receiving teletext, and FIG. FIG. 7 is a front view showing another example of how the screen is divided. 1... Screen with an aspect ratio of 16:9, 2... Screen with an aspect ratio of 4:3, 3.4... Screen remaining on the side, 5
~16...Small screen with aspect ratio 4:3, 17...
Pointer, 18-20...Small screen with aspect ratio 4:3, 21...Decoded video signal input terminal, 22...Video playback circuit, 23...Composition circuit, 24...CRT, 2
5... Teletext decoder, 26... Memory.

Claims (2)

[Claims] (1) In a television receiver having a first screen with an aspect ratio of 16:9, a second screen with an aspect ratio of 4:3 is formed on the first screen when receiving NTSC broadcasting, and a second screen with an aspect ratio of 4:3 is formed on the first screen; A television receiver characterized in that the remaining area of the screen is divided into a plurality of third screens with an aspect ratio of 4:3, and the content of teletext is displayed on the third screens. (2) The first pages of different teletext programs are displayed on the plurality of third screens, and the screen of the program selected from among them is enlarged and displayed on the second screen. A television receiver according to claim 1.