JPH05103277A - Display controller - Google Patents

Abstract

PURPOSE:To prevent a state in which the video signal of a source selected in a mode in which the kind of the input source is not displayed is not supplied, from being mistaken for the state of a power source OFF. CONSTITUTION:At the time of switching the input source from a laser disk to an 8mm video tape recorder, when the mode in which the kind of the input source is not displayed is set, the video signal from the laser disk is switched to the video signal of the 8mm video tape recorder. Also, when the video signal of the 8mm video tape recorder is not outputted, the character of 'video 1' is displayed on a screen at the time of the lapse of 3 seconds after the switching operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display control apparatus suitable for use in a video system for selecting one of a plurality of sources such as a video tuner, a video tape recorder, a laser disk, etc. and displaying it on one display apparatus. Regarding

[0002]

2. Description of the Related Art In a conventional video system, one of a plurality of sources such as a video tuner, a video tape recorder or a laser disk is selected and displayed on one CRT. And
In order to clarify what the source is currently displayed on the CRT, the source type is displayed on the screen. Figure 5 (a) shows the image reproduced by the 8mm videotape recorder (in this example, the image of Mt. Fuji).
Shows an example in which is displayed. As shown in this figure, in addition to the original image, "8 mm" is displayed at the upper right of the screen as a character indicating the type of source. By viewing this display, the user can easily recognize that the currently selected and output image is from an 8 mm video tape recorder.

The display of the source type can be toggled in the order of video 1, 8 mm video, VHS, beta, laser disk, TV, "no display" as shown in FIG. 6, for example. When "no display" is selected, the source type is not displayed.

[0004]

In the conventional video system, when the mode in which the type of the source is not displayed is selected as described above, when the video signal is not supplied from the source, FIG. Since nothing is displayed on the screen as shown in (b), it is difficult to distinguish it from the power-off state, which is one of the factors that the user forgets to turn off the power.

The present invention has been made in view of such a situation, and is intended to prevent forgetting to turn off the power source and prevent unnecessary power consumption.

[0006]

The display control device of the present invention includes a source selection button 13 (c) as a selection means for selecting a source to be output and displayed on the screen, and a display of the type of the source to be output and displayed on the screen. An on / off button 13a and a source selection button 13c as switching means for switching on or off.
Step S8 as a determination means for determining the presence / absence of the signal of the source selected by, and there is no source signal selected by the source selection button 13c, and the on / off button
If the display of the source type is turned off by 3a,
Steps S12 and S as display means for performing a predetermined display
13 is provided.

[0007]

In the display control device having the above structure, when there is no signal of the source selected by the source selection button 12c and the display of the source type is turned off by the on / off button 13a, for example, "Video 1" Is displayed. Therefore, even when there is no signal from the selected source, it can be distinguished from the state when the power is off.

[0008]

2 is a block diagram showing the construction of an embodiment of a video system to which the display control device of the present invention is applied.
The video tuner 2 demodulates the radio wave received via the antenna 1 and supplies the demodulated video signal and audio signal to the selector 5. The selector 5 is supplied with the video signal and the audio signal output from the 8 mm video tape recorder 3 and the laser disk 4, respectively. The selector 5 is
For example, one of the signals supplied from the tuner 2, the 8 mm video / video tape recorder 3 or the laser disk 4 is selected by the control circuit 10 including a microcomputer, and the selected video signal is supplied to the video processor 6. In addition, the audio signal is sent to the audio processor 7
Output to each. The video processor 6 processes the input video signal, converts it into R, G, B signals and CRs.
Output to T8. The audio processor 7 also processes the input audio signal and outputs it to the speaker 9.

The remote control device 13 turns on a source selection button 13c operated when selecting a source of the tuner 2, the 8 mm video tape recorder 3 or the laser disk 4 and an indication of the type of the selected source. Or an on / off button 13 that is operated when turning off
a, it has various keys including a display switching button 13b which is operated when switching the display of the source type, and when the remote control device 13 is operated, a signal corresponding to the operation is emitted as infrared rays. Light receiving element 1
2 receives this infrared ray, converts it into an electric signal, and outputs it to the control circuit 10. The control circuit 10 controls each part in response to the input instruction. Further, the non-volatile memory 11 stores predetermined data as needed.

Next, the operation will be described. When the source selection button 13c of the remote control device 13 is operated, a selection signal corresponding to the operation is output as infrared rays. This infrared ray is received by the light receiving element 12, converted into an electric signal, and output to the control circuit 10. The control circuit 10 reads this input signal and controls the tuner 2, the 8 mm video tape recorder 3 or the laser disk 4 in accordance with the read result. As a result, the tuner 2, the 8 mm video tape recorder 3 or the laser disk 4 starts operating, and the reproduced video signal and audio signal thereof are output to the selector 5. The control circuit 10 also
At this time, the selector 5 is controlled to switch the selector 5 so as to select the source corresponding to the command from the remote control device 13. The audio signal and the video signal selected by the selector 5 are supplied to the audio processor 7 and the video processor 6, respectively. The audio processor 7 processes the input signal to produce a speaker 9
Output to and emit sound. Also, the video processor 6 processes the input signal and converts it into R, G, B signals, and CR.
Output to T8. In this way, the image and sound of the selected source can be monitored from the CRT 8 and the speaker 9.

Next, referring to the flow chart of FIG.
The operation of displaying the selected source type on the RT8 will be described. When the display switching button 13b of the remote control device 13 is operated, the control circuit 10 sets the display rewriting mode. When the control circuit 10 determines in step S1 that the display rewriting mode is set, the control circuit 10 proceeds to step S2 and displays the input source in the video 1, 8 mm video, VHS in response to the operation of the display switching button 13b. Toggle, beta, laserdisc, TV, no display, video 1 toggle. Display switching button 13b
The setting corresponding to the operation of is stored in the non-volatile memory 11 in step S3.

When it is determined in step S1 that the display rewriting mode is not set, the process proceeds to step S4, and the source selection button 13 of the remote control device 13 is selected.
It is determined whether or not c has been operated. Source selection button 13c
If is operated, the process proceeds to step S5, and the input source is switched. That is, the control circuit 10
Operates either the tuner 2, the 8 mm video tape recorder 3 or the laser disk 4 in response to the input command, and causes the selector 5 to selectively output the corresponding output. Further, the selected source is displayed corresponding to the data stored in the non-volatile memory 11. For example, when the tuner 2 is selected, the characters "TV"
If the 8 mm video tape recorder 3 is selected, "8
When the laser disk 4 is selected, the characters "millimeter" are output from the control circuit 10 to the video processor 6 and displayed on the upper right of the CRT 8.

In step S4, the source selection button 13
When it is determined that c is not operated, the process proceeds to step S6, and it is determined whether 3 seconds have elapsed after the source was switched. If 3 seconds have not yet elapsed after switching the source, the process proceeds to step S7 and a predetermined process is executed. After switching from one source to another,
When 3 seconds have elapsed, the process proceeds from step S6 to step S8, and it is determined whether the video signal (or audio signal) is supplied from the switched source.
If there is a video signal (or audio signal), the process proceeds to step S9, and it is determined whether or not "no display" is currently selected. As described above, if the "no display" mode is selected, the display indicating the type of source is not performed, and the process returns to step S1. For example, as shown in FIG.
When the source is switched to the 8 mm video tape recorder 3 from the state where is selected, the display screen of the CRT 8 changes from the output of the laser disk 4 to the output image of the 8 mm video tape recorder 3 (FIG. 1A) (Example) If the image of Mt. Fuji) is switched to. Then, even when 3 seconds have passed after the switching, the display indicating the type of the input source is not performed as shown in FIG. 1B.

If it is determined in step S9 that the mode is not "non-display" mode, that is, if any input source is displayed (display executed in step S5), the display is erased in step S10. Will be. For example, assume that the laser disk 4 is selected as shown in FIG. 4, its output is displayed, and characters indicating the type of source of “laser disk” are displayed in a superimposed manner. In this state, for example, when the input source is switched to the 8 mm video tape recorder 3, the image output from the 8 mm video tape recorder 3 is displayed on the CRT 8 and the character "8 mm" is displayed on the upper right of the screen. (Fig. 4a). Then, after switching from the laser disk 4 to the 8 mm video tape recorder 3 and 3 seconds have passed, the character "8 mm" is erased (FIG. 4b).

When it is determined in step S8 that the video signal (or audio signal) is not supplied from the input source, the process proceeds to step S11, and it is determined whether or not the "no display" mode is currently set. To be done.
If the "no display" mode is set, step S
12, the character "Video 1" is displayed in the upper right corner of the screen. If it is not the "no display" mode (when the character indicating the type of the input source is displayed), the process proceeds to step S13, and the display of the set mode is continued.

For example, in the state where the "no display" mode is set as shown in FIG.
From 8 to 8 mm video tape recorder 3, when the video signal (or audio signal) is not supplied from 8 mm video tape recorder 3, nothing is displayed on CRT 8 as shown in FIG. 1C. Not done. However, when 3 seconds have elapsed after the switching, as shown in FIG.
It is displayed on the upper right of 8.

Further, as shown in FIG.
When the source is switched to the 8 mm video tape recorder 3 in the state where is selected, if the video signal (or audio signal) is not supplied from the 8 mm video tape recorder 3, as shown in FIG. The image from the video tape recorder 3 is not displayed on the CRT 8. However, the character "8 mm" is displayed.
This state continues as shown in FIG. 4d even after 3 seconds have elapsed after switching. Therefore, when the selected input source is not outputting a video signal (or audio signal), this state is prevented from being erroneously recognized as a power-off state.

[0018]

As described above, according to the display control device of the present invention, even when the display of the source type is turned off, a predetermined signal is supplied when the signal is not supplied from the selected source. Since it is displayed, it is prevented that the power-off mode is mistakenly recognized, and power is not wastefully consumed.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a change in screen when switching an input source in a “no display” mode.

FIG. 2 is a block diagram showing the configuration of an embodiment of a video system to which the display control device of the present invention is applied.

FIG. 3 is a flowchart illustrating the operation of the embodiment of FIG.

FIG. 4 is a diagram for explaining changes in the screen when the input source is switched from the laser disk to the 8 mm video tape recorder.

FIG. 5 is a diagram for explaining display in a conventional video system.

FIG. 6 is a diagram illustrating switching of display of input source types.

[Explanation of symbols]

 2 TV tuner 3 8 mm video tape recorder 4 Laser disk 5 Selector 6 Video processor 7 Audio processor 8 CRT 9 Speaker 10 Control circuit 11 Non-volatile memory 12 Light receiving element 13 Remote control device 13a On / off button 13b Display switching button 13c Source selection Button

Claims (1)

[Claims] 1. A selection means for selecting a source to be output and displayed on a screen, a switching means for switching on or off a display of a type of a source to be output and displayed on a screen, and a signal of the source selected by the selecting means. And a display unit for performing a predetermined display when there is no signal of the source selected by the selection unit and the display of the source type is turned off by the switching unit. A display control device characterized by the above.