JPS63234679A - Television receiver - Google Patents

Abstract

PURPOSE:To attain display on the screen sharply without applying blanking to the background pattern by decreasing the brightness of the background pattern in case of the screen display. CONSTITUTION:As the display in a cathode ray tube 17, for example, a channel number, sound volume, time display and calendar, and a list converting between position number and set reception channel are used. Among the displays, the calendar display and a list of correspondence between the position number and the set reception channel are desired to be displayed with distinction from the background pattern, then the brightness of the background pattern is lowered. The brightness of display characters is kept as it is. Thus, the brightness of the displayed character is increased relatively and even when the list of correspondence between the position number and the set reception channel is displayed superimposingly on the background pattern, the display character 31 is displayed sharply.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a television receiver capable of displaying various information on a screen.

[Summary of the invention]

This invention provides a TV or TV receiver that can display various information on the screen, and by lowering the brightness of the background screen when displaying it on the screen, the background screen can be displayed clearly without blanking. The screen can be displayed on the screen.

[Conventional technology]

In recent years, many television receivers are capable of displaying not only channel numbers and volume, but also various information such as time and calendar displays. In addition, as the number of receiving channels increases, ffl! allows you to display a list of correspondence between position numbers and set receiving channels on the screen. has been done.

In this way, when displaying various information on the screen of a television receiver, depending on the background screen, the screen display may become difficult to read.When displaying channel numbers or volume, , since the display area is a part of the screen and the user focuses on the background screen rather than the screen display.
Even if the display becomes difficult to see, it is not a big problem. However, when displaying a calendar or a list of correspondence between position numbers and set reception channels, the entire screen is used as the display area, and the user focuses on the screen display rather than the background screen, so the display It becomes a big problem that it becomes difficult to see.

Therefore, in conventional television receivers, when displaying a calendar or displaying a list of correspondence between position numbers and set reception channels, etc., the background screen is blanked to ensure that the display is displayed clearly. ing.

[Problem that the invention seeks to solve]

However, if you apply blanking to the background screen,
Only the screen display will be displayed on the screen.

When displaying a calendar or a list of correspondences between position numbers and set reception channels, it goes without saying that the display is clearly displayed, but there is a desire to continue looking at the background screen during this time.

Therefore, an object of the present invention is to provide a television receiver that can clearly display a screen without blanking the background screen, for example, when displaying a calendar or a list showing the correspondence between position numbers and set reception channels. The aim is to provide the opportunity.

[Means for solving problems]

The present invention is a television receiver capable of superimposing various characters and figures on the television screen and displaying them on the screen, and when displaying the characters and figures on the screen, the brightness of the background screen is reduced. This is a television receiver characterized by the following.

[Effect]

If you want to draw more attention to the display than the background screen, such as when displaying a calendar or displaying a list of correspondences between position numbers and set reception channels, the brightness of the background screen can be lowered. On the other hand, the brightness of the displayed characters remains unchanged. As a result, the brightness of the displayed characters is relatively increased, and the displayed characters are displayed clearly.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of a television receiver to which the present invention is applied. In FIG. 1, a received signal from an antenna 1 is supplied to a tuner circuit 2. In FIG. A tuner circuit 2 selects a signal of a desired reception channel, and a mixing circuit of the tuner circuit 2 converts this signal into a video intermediate frequency signal.

This television receiver employs a PLL synthesizer type channel selection circuit. That is, the local oscillation signal from the tuner circuit 2 is supplied to the phase comparator 5 via the prefrequency divider 3 and the frequency divider 4. The phase comparator 5 has
A reference signal from a base/main signal oscillator 6 is supplied. The phase comparator 5 compares the local oscillation output passed through the prefrequency divider 3 and the frequency divider 4 with the reference signal output from the reference signal oscillator 6. This comparison output is supplied to the tuner circuit 2 via the low-pass filter 7, and the local oscillation signal is controlled based on this comparison output. These □, prescaler 3
A PLL 8 is composed of a frequency generator 4, a phase comparator 5, a reference signal oscillator 6, and a low-pass filter 7. The frequency division ratio of the frequency divider 4 is set by the microcomputer 10 based on channel data stored in the memory 9 in advance. By setting the frequency division ratio of this frequency divider 4, a desired reception channel is selected.

The video intermediate frequency signal output from the tuner circuit 2 is supplied to the video detection circuit 12 via the video intermediate frequency amplification circuit 11. The video detection circuit 12 performs video detection on the output of the video intermediate frequency amplification circuit 11, and the video detection circuit 12 outputs a composite color video signal. This composite color video signal is supplied to input source selector 13.

This television receiver has an external video input terminal of 14A.
, 14B. This external video input terminal 14A
, 14B can be connected to video equipment such as a VTR or video disc.

Composite color video signals from video equipment connected to external video input terminals 14A and 14B are supplied to input source selector 13.

The input source selector 13 is switched by the output of the microcomputer 10 based on a command from the commander 21. The input source selector 13 selects the video signal from the video detection circuit 12 and the external video input terminal 1.
A desired video signal is selected from among the video signals from 4A and 14B.

The composite color video signal output from the input source selector 13 is supplied to the video signal processing circuit 15, and
The synchronization signal in this composite color video signal is transmitted to the deflection circuit 16.
is supplied to Horizontal and vertical deflection currents are formed in the deflection circuit 16, and these horizontal and vertical deflection currents are applied to the cathode ray tube 17.
deflection coil. 3 in video signal processing circuit 15
The primary color signals R, G, and B are demodulated, and these three primary color signals R, G
.

B is supplied to the cathode ray tube 17 via adders 18A, 18B, and 18C, respectively.

In this television receiver, various adjustments are made using adjustment data generated from the microcomputer 10. That is, the microcomputer 10 outputs image quality adjustment data such as color tone, color density, brightness, sharpness, etc. This image quality adjustment data is supplied to the D/A converter 25. This image quality adjustment data is converted into an analog control voltage by the D/A converter 25, and this analog control voltage is supplied to the video signal processing circuit 15. Image quality is adjusted using this analog control voltage.

Commands from a commander 21 are supplied to the microcomputer 10 via a light receiving section 22, and commands are also given to the microcomputer 10 from a key switch 23 arranged on an operation panel of the television receiver. Based on commands from the commander 21 or key switch 23, channel settings and volume settings are made, as well as image quality adjustment. Furthermore, various display signals are output from the display generation circuit 24 in response to commands from the commander 21 or the key switch 23. This display signal is superimposed on the three primary color signals R1G and B output from the video signal processing circuit 15 by adders 18A, 18B, and 18C, respectively. Various information is displayed on the cathode ray tube 17 based on the output from the display generating circuit 24.

Displays displayed on the cathode ray tube 17 include, for example, a channel number, volume, and time display, as well as a calendar, a list of correspondences between position numbers and set reception channels, and the like. Among these displays, when it is desired to draw more attention to a display than the background screen, such as a calendar display or a list display of correspondence between position numbers and set reception channels, the brightness of the background screen is lowered. On the other hand, the brightness of the displayed characters remains unchanged. As a result, the brightness of the displayed characters increases relatively, and as shown in Fig. 3, even when a list of correspondence between position numbers and set reception channels is displayed superimposed on the background screen, the displayed characters 31 remain clear. will be displayed on the screen.

That is, as shown in FIG. 2, Brown dI11? When performing a screen display on a screen, it is determined whether the screen display is a display that should attract more attention than the background screen (for example, a calendar display, a list display of correspondence between position numbers and set reception channels) (step ■), If the display is desired to attract more attention than the screen, display data is set (step ■). Then, among the image quality adjustment data given from the microcomputer 10 to the D/A converter 25, the brightness data is changed, and the brightness of the background screen is lowered (
Step ■).

〔Effect of the invention〕

According to this invention, when it is desired to draw more attention to a display than the background screen, such as a calendar display or a list display of correspondence between position numbers and set reception channels, the brightness of the background screen is lowered. On the other hand, the brightness of the displayed characters is
It will be kept as is.

Therefore, the displayed characters are displayed clearly. However, at this time, the background screen is not blanked, so
You can keep looking at the background screen.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a flowchart used to explain the embodiment of the invention, and FIG.
The figure is a route map used to explain one embodiment of the present invention. Explanation of main symbols in the drawings 10: microcomputer, 15: video signal processing circuit, 17: cathode ray tube, 24: display generation circuit,
25: D/A converter.

Claims (1)

[Claims] In a television receiver capable of displaying various characters and figures superimposed on the television screen, the brightness of the background screen is reduced when the characters and figures are displayed on the screen. A television receiver characterized by: