JPS58207779A - Channel display of television receiver - Google Patents

Abstract

PURPOSE:To avoid a displayed character from being an eyesore to a viewer of received picture at usual times, by displaying the displayed character largely at the channel selection and making the channel display with a small character, thereafter. CONSTITUTION:A channel selecting signal A is outputted from a channel selecting circuit 3 at the channel selection, the 1st - the 3rd timers are operated sequentially, a channel information signal outputted from the channel selecting circuit 3 is displayed on a cathode ray tube 10 in three stages. A timer 33 is driven with a power supply detecting signal, and a channel display character of a small character for 10 seconds. When a recall switch 30 is opened and a channel is selected, the display character X is changed as large, medium and small according to the channel data B, and then the small character is displayed continuously. Further, when the recall switch 30 is closed, the channel display of the small character is disappeared.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conventional channel display device for a television receiver, which relates to a device for displaying channel display characters on an image display element such as a cathode ray tube in a television receiver. was one that immediately displayed a light-up display using a light emitting diode as a display means.
The disadvantage was that the display was difficult to see when viewed from a distance. Also, there were devices that displayed channel letters on cathode ray tubes, but in the conventional ones, - was displayed in a large size and then erased.If the letters were always displayed, the content of the received image would be changed to channel letters. If the channel is erased after a certain period of time, it is impossible to determine which channel is currently being received.

Therefore, the present invention solves the following conventional drawbacks, and
To provide a device capable of displaying channel display as characters on the screen in an easy-to-understand manner and not interfering with a received image under normal conditions.

EMBODIMENT OF THE INVENTION Hereinafter, the present invention will be described in detail with reference to the drawings showing one embodiment thereof.

FIG. 1 shows its configuration, and in the figure, 1 indicates a normal J-revision receiver. 2 is the circuit, 3 is a channel selection circuit using a logic circuit, 4 is a VIF circuit, 6 is a video detection circuit, 6 is a video amplification circuit, 7 is a video output circuit, 8 is a synchronization separation circuit, 9 is a horizontal/vertical The deflection circuit 10 is a CRT serving as an image display element for displaying a received image. I cut it,
11 is a SIF circuit, 12 is a circuit for Lr'7' and detection θ,
13 out of 13 audio 9, a filter that separates the main channel signal of the bow, the sub channel signal and the pilot signal, 1
4 is a 'tlJ separate circuit for SDE mode, 16 is an 11 separate circuit for dual mode, 16 is an audio multiplex signal processing circuit that demodulates the sub-channel signal and performs matrix synthesis and switching, 17.18 is an audio amplification circuit, 19 , 20 is an audio output circuit, and 21.22 is a speaker. Since these r1 are normal circuits, detailed explanation thereof will be omitted. 23 is a character generator that generates a display signal (video signal) for displaying the channel letter (for example, "6") of the receiving channel in this device, and 24 is a character generator that generates the display signal in synchronization with the scanning of CRTlo. This is a timing signal generation circuit for controlling. Furthermore, 25 is a display/size switching circuit that switches the displayed characters and their sizes according to the reception channel and the passage of time.

26, 27, and 28 are first to third timers that control the time for switching the display size, 29 is an OR gate that controls timers 26 to 28 when switching channels and recall display, and 3o is a switch for switching recall display. switch, 31
is the differential circuit for its output. 32 is the 4th switch when the power is turned on.
A power-on detection circuit 34 controls a timer 33, and a color switching circuit 34 switches the color of displayed channel letters and mode letters according to the mode.

2 to 4 show how channel letters X are displayed on the screen of CRT10.

The operation will be explained below.

The channel selection circuit 3 outputs a channel switching signal A at the time of channel switching, and triggers the first timer 26 via the OR gate 29 at the time of channel switching. Further, the channel selection circuit 3 outputs a channel information signal B indicating the channel being selected, and information on which channel is being selected is supplied to the switching circuit 26.

The first timer 26 outputs a pulse C for a fixed period of time (for example, about 1 second) after being triggered, and during the period of the pulse C drives the upper case selection circuit 34, and at the trailing edge of the pulse C, a second pulse C is output. Trigger timer 27. The second timer 27 also outputs a pulse D for a certain period of time (for example, about 1 second) after being triggered, and during the period of the pulse D,
In addition to driving the middle character selection circuit 36, the trailing edge of pulse D also triggers the third timer 28.

This third timer 28 is also triggered for a fixed period of time (
For example, the OR gate 36 outputs a pulse E of about 1 second).
The lowercase character selection circuit 3A is driven through the lowercase character selection circuit 3a. The display/size switching circuit 26 sequentially selects and drives the selection circuits 34, 35, and 36 for uppercase, middle, and lowercase letters, respectively, thereby generating the timing signal generation circuit 24 for character generator reading. drive and control.

This timing signal generation circuit 13 for reading the character generator generates uppercase letters, middle letters,
A timing signal F for reading a lowercase character display signal from the character generator 23 is generated.

The display signal G output from the character generator 14 is input to the color switching circuit 34, and the color of the channel display character is changed by the stereo mode discrimination output H and the dual mode discrimination output I. Here, stereo mode discrimination output H
is input to the Noah gate 38 and the AND gate 39, and the dual mode discrimination output l is input to the Noah gate 38 and the AND gate 39.
0, and the output 1 of the NOR gate 3B, that is, the output when the mode is neither duplex mode nor stereo mode (monaural mode), is input to the AND gate 41. Therefore, the output K of these AND gates 40, 39, and 41.

Adding L and M to the video output circuit 7, the output of the AND gate 4o is red, and the output of the AND gate 39 is green.

If the output of the AND gate 41 is used to drive each blue video output circuit, the channel letter When receiving broadcasts in monaural mode, neither mode nor duplex mode, each can be displayed in blue.

In this way, the first to third timers 26, 27.

28 are operated sequentially when switching channels, the size of the letter
Changes to lowercase letters in the figure and 3 steps.

In FIGS. 2 and 3, the size and display position of the character X are changed synchronously, and this is controlled by the read timing signal generation circuit 24 of the character generator 23.

Also, when the power is turned on, the detection output N of the power-on detection circuit 32 is
Accordingly, the fourth timer 33 is activated.

This timer 33 is a timer that generates an output Q for about 10 seconds, and drives a lowercase character selection circuit 37 via an OR gate 36. That is, when the power is turned on, the lowercase channel display character X is displayed for about 10 seconds.

This is a temporary display that takes into account the time it takes for the cathode of the cathode ray tube 10 to heat up (approximately 3 seconds); if it is too short, the channel display characters will disappear by the time the image begins to be projected. This is to prevent this from happening.

The above description is based on the case where the recall switch 30 is closed. However, when the recall switch 3° is open, the lowercase letter selection circuit 37 is connected via the OR gate 36.
is always driven, so the lowercase channel display letter
remains displayed. That is, when a channel is selected, the channel display character X is changed from large to medium to small according to the channel data B, and thereafter the lower case character is continuously displayed. As described above, this display is displayed in different colors depending on each broadcast mode.

When the recall switch 30 is opened, the output P of the differentiating circuit 31 triggers the first timer 26, so the channel letter After that, the lowercase letter display continues, but when the recall switch 30 is further closed, the input to the OR gate 36 disappears, and the lowercase channel display disappears.

As described above, according to the present invention, the configuration is relatively simple, and when switching channels, the channel display characters are displayed in a large size so that they can be clearly seen from a distance, and after that, they can be configured so as not to interfere with the normal received image. You can get a device that can display channels in small letters.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a channel display device of a television receiver according to an embodiment of the present invention, FIG. 2, FIG.
FIG. 4 is a perspective view of the display state. 1... Television receiver, 2... Tuner, 3... Tuning circuit, 7... Video output circuit, 1o... Cathode ray tube. , 23...Character generator, 24...Timing signal generation circuit, 26...Display/size switching circuit,
26, 27. 28... Timer, 34...
. . . Uppercase character selection circuit, 35 . . . Medium character selection circuit, 37 . . . Lowercase character selection circuit. Name of agent Patent attorney Toshi Nakao 11 to 1 Toshi O Toshi

Claims (1)

[Claims] an image receiving circuit that receives a television signal and generates a video signal for image display; an image display element that displays a received image based on the one video word; and a channel selection circuit that switches channels received by the image receiving circuit; Display signal generating means for generating a display signal for displaying the received channel as a channel letter on the screen of the image display element F; and channel switching of the channel letter to be displayed by the channel selection circuit. 1- channel display switching means for controlling the display signal generating means in accordance with channel information from the channel selection circuit; and a size for switching the size of the channel letters to be displayed in a plurality of stages. and a timer means for controlling the size switching means to change the size of the displayed channel letters in a plurality of stages so as to sequentially decrease the size of the displayed channel letters over time when the channel is switched by the channel selection circuit. A channel display device for a television receiver, characterized by: