JP2596409Y2 - Television receiver - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and more particularly to a television receiver for switching an input mode and an aspect ratio of a screen size.

[0002]

2. Description of the Related Art Generally, in a television receiver, the aspect ratio of the screen size is switched between a standard ratio of 4: 3 and 16: 9 with the advent of a landscape screen. In response to this, information indicating whether the aspect ratio of the screen related to the video being reproduced is 4: 3 or 16: 9 is also transmitted from a reproducing device such as a VTR (Video Tape Recorder) as a control signal. It is supposed to be sent. A control signal from the reproducing device is input to a Y / C (luminance / chroma) signal input terminal in a television receiver compatible with Japan, for example, and a DC (direct current) control signal is applied to the C signal. If the direct current is 0 V, the aspect ratio indicates 4: 3, and if the direct current is 5 V, the aspect ratio indicates 16: 9.

In a European television receiver, a control signal from a playback device is input as a DC voltage via an eighth input / output terminal having 21 audiovisual terminals. If this voltage is 0 V, there is no playback screen, and if this voltage is 5 V, the aspect ratio is 16:
In the case of 9, 12 V, the aspect ratio indicates 4: 3. In this type of television receiver, the aspect ratio of the screen is automatically switched to any of the above-described ratios in accordance with the aspect ratio of the reproduced video by the above-described DC control signal. On the other hand, since there are reproduction devices that do not output the control signal as described above, for this type of source, the user manually switches and controls the aspect ratio of the screen size using means such as a remote control. It has also been done.

[0004]

By the way, in the above-mentioned Japanese television receiver, the information obtained by the control signal is only information on the aspect ratio of 0V and 5V. Further, in a television receiver compatible with Europe, three values are detected by one control signal as described above, whereby two pieces of information, that is, information relating to an aspect ratio of a screen size and information relating to an input switching mode are obtained. In this case, switching is performed automatically, but there is a problem that switching cannot be performed according to the user's preference. The present invention focuses on the above-mentioned problems and has been devised to effectively solve them. SUMMARY OF THE INVENTION An object of the present invention is to provide a television receiver that can switch between an aspect ratio and an input mode by combining automatic switching and switching by a user.

The present invention has been made to solve the above problems.
The television receiver receives the television signal.
Tuners to receive signals and external signals to input video signals from outside
An input terminal, and a video signal obtained by the tuner.
Select the video signal input from the external input terminal
By switching to, the video from the tuner
TV mode and video from the external input terminal
Switch the input mode to and from the external input mode
A mode changeover switch section and the external input terminal
Comparing the supplied control signal with a reference voltage.
The screen size of the video signal from the external input terminal
A comparison unit that obtains information about the aspect ratio of the
Switching between the input aspect ratio and the input mode.
User input to input user control signal
Unit and the user input unit to switch the input mode.
When a user control signal to change
When controlling to switch the mode switch,
Information on the aspect ratio obtained by the comparison unit.
And the cutoff of the aspect ratio input from the user input section.
One of the user control signals for replacement
To switch the aspect ratio of the screen size
A control unit that outputs an aspect ratio control signal of
Based on the aspect ratio control signal from the control unit
To change the screen size aspect ratio
A ratio changing circuit, wherein the control unit controls the external input mode.
The aspect ratio obtained by the comparison section.
The aspect ratio of the screen size according to the information
Aspect ratio control circuit
After switching the aspect ratio by supplying a roll signal,
The aspect ratio of the screen size is determined by the user input unit.
User control signal for switching is input
In this case, the user control signal is given priority and
New aspect ratio control for the spectrum ratio change circuit
Signal from the external input terminal.
Screen size aspect ratio by the control signal
Control when information about the
Based on information about the aspect ratio of the screen size by the signal
A new aspect ratio to the aspect ratio change circuit.
It is configured to supply a control signal .

[0006]

According to the present invention , the aspect ratio is controlled by a control signal from an external input / output terminal.
Output control signal which is information related to, the co <br/> Control signals are input to the control unit. From the user input unit, a user control signal for instructing switching of the aspect ratio and switching of the input mode is input by the user as necessary, and this signal is sent to the control unit. The control unit switches a mode switch for input mode switching based on the control signal and the user control signal obtained by the comparison unit to select a TV (television) mode or an external input mode and to change a screen size. And outputs an aspect ratio control signal to the aspect ratio changing circuit. This aspect ratio changing circuit can actually switch the aspect ratio of the image displayed on the screen based on the aspect ratio control signal, for example, by causing a deflection circuit or a video signal processing section to act as an aspect ratio change. .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the television receiver according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing one embodiment of a television receiver according to the present invention, and FIG. 2 is a circuit diagram showing a comparison unit shown in FIG. In the television receiver 1, a signal received by an antenna 2 is sent to an intermediate frequency unit 4 via a tuner 3, where the frequency is converted into a video band, and
Output as signal A. The TV signal A is input to a mode switching switch unit 5 for switching the input mode between a TV mode and an external input mode, and the output of the switch unit 5 constitutes a part of an aspect ratio changing circuit 6. The video signal is input to the video signal processing unit 7 and is subjected to a predetermined process for changing the aspect ratio. The output of the processing unit 7 is input to, for example, an electron gun (not shown) of the picture tube 8.

On the other hand, this receiver 1 has an external input / output terminal for audiovisual, such as an input / output terminal having 21 terminals, for inputting a reproduction signal from a reproduction device 9 such as a video tape recorder. For example, a video signal B is output from the twentieth terminal 11 to the mode changeover switch unit 5, and a control signal C is output from the eighth terminal 12 to the comparison unit 13. Is output. The control signal C is, for example, 0
V, 5V, have been made to take the three values of 12V, by comparing the signal reference voltage, so as to output the control signal SW2 about the control signal SW1 and the input mode relates to the aspect ratio of the screen size It is configured.

More specifically, the comparing section 13 has two comparators 13A and 13B composed of amplifiers as shown in FIG. 2, and has a negative input terminal of one amplifier 13A and a negative input terminal of the other amplifier 13B. The + input terminals each have an input resistor R1
, A control signal C is input from the 8th pin 12 of the external input / output terminal. In addition, in order to generate a reference voltage for comparison, a series circuit including a series connection of a resistor R2, a resistor R3, and a resistor R4, one end of which is connected to a +12 V DC source and the other end of which is grounded, is formed. R
The connection point between the resistor 2 and the resistor R3 is connected to the + input terminal of one comparator 13A, and the connection point between the resistors R3 and R4 is connected to the minus terminal of the other amplifier 13B.

Each output terminal of each of the comparators 13A and 13B is connected to, for example, a + 5V power supply via resistors R5 and R6, and a control unit 14 such as a microcomputer or the like is connected via output resistors R7 and R8, respectively. Connected to Further, a diode 15 having the output terminal side of the comparator 13B directed forward is connected between the output terminals of the comparators 13A and 13B. In the present embodiment, if the control signal C is 0 V, no reproduced image is shown, and if the control signal C is 5 V, an aspect ratio of 16: 9 is shown.
2V indicates a 4: 3 aspect ratio. Therefore, one comparator 13A outputs a control signal SW1 relating to the aspect ratio of the screen size. This signal indicates low when the aspect ratio is 4: 3, and indicates high when the aspect ratio is 16: 9. The other amplifier 13B outputs a control signal SW2 relating to the input mode, and this signal indicates low if the TV (broadcast) input mode in the TV receiver standard,
High when in external input mode.

On the other hand, the control section 14 has a user input section 18 comprising a remote control 16 and a light receiving section 17.
, And is configured to receive a user control signal D for instructing switching of the screen size aspect ratio and switching of the input mode. The control unit 14 switches the input mode and the screen size aspect ratio based on the control signals obtained by the comparison unit 13, that is, the control signals SW1 and SW2 and the user control signal. A mode control signal E is output to the mode changeover switch section 5 to perform mode changeover based on the control signal SW2 and the most recently input signal among the user control signals. 7 to output the first aspect ratio control signal F
Alternatively, a deflection circuit 19 connected to a deflection coil of the picture tube 8
To output the second aspect ratio control signal G to switch the aspect ratio. Therefore, the video signal processor 7 and the deflection circuit 19 constitute the aspect ratio changing circuit 6.

Next, the operation of the embodiment constructed as described above will be described. First, the user uses the remote control 16 to input input mode switching and screen size aspect ratio switching as necessary, and this signal is input to the control unit 14 as a user control signal D.
On the other hand, a radio wave received by the antenna 2 is input as a TV signal A to the picture tube 8 via the mode switch unit 5 and the video signal processing unit 7. Also, a signal from the playback device 9 is input to an external input / output terminal 10, a video signal is output from the twentieth terminal 11, and this signal is input to the mode changeover switch unit 5; The control signal C is output from the second terminal 12, and this signal is input to the comparison unit 13.

In the comparing section 13, 0V, 5V, 12V
The control signal C, which takes three values of V, is compared with various constant voltages defined proportionally by resistors R2, R3, R4 shown in FIG.
W1 and SW2 are output and input to the control unit 14. The control unit 14 determines the input mode based on the control signal SW2 relating to the input mode and the user control signal, and based on this, determines the mode control signal E2.
, The mode changeover switch section 5 is switched to select the TV signal A or the video signal B. After switching the input, the control unit 14 determines whether to switch the aspect ratio of the screen based on the user control signal D in the TV mode, and switches between the control signal SW1 and the user control signal D in the external input mode. The switching of the aspect ratio is determined based on the first aspect ratio control signal F or the second
As an aspect ratio control signal G to the video signal processing section 7 and the deflection circuit 19, respectively, to actually switch the aspect ratio.

FIG. 3 shows a flowchart of the operation executed in the control unit 14. First, when the TV is turned on in S1, the aspect ratio is automatically reset,
The aspect ratio is set to 4: 3 mode (S2). Next, in S3, it is determined whether or not the input mode is switched based on the user control signal. If NO, that is, if there is no switching, in S4, the control signal SW2 relating to the input mode is high (H). It is determined whether the signal is low (L). If the signal is high (H), the external input mode (FIG. 2)
), The external input mode is set so that the video signal B is selected by the mode changeover switch unit 5 in S5.

At S6, it is further determined whether or not the aspect ratio has been switched based on the user control signal D.
Next, in S7, the control signal S related to the aspect ratio is set.
It is determined whether there is a change in W1. If NO here, that is, if there is no change in the control signal SW1, the EXT flag indicating the external input mode is set to 1 in S8.
Is determined, and if NO, that is, if 1 is not set, the process returns to S3 again. On the other hand, if the result of S7 is YES, that is, if there is a change in the control signal SW1, it is determined in S9 whether the control signal SW1 is high (H) or low (L).

As a result, if the signal is high, that is, if the aspect ratio is 16: 9, the control unit 28 deflects the first and second aspect ratio control signals F or G to the video signal processing unit 7 in S10. The image is output to the circuit 19, the aspect ratio of the screen of the picture tube 8 is set to the value, and the process goes to S8. If it is low in S9, that is, if the aspect ratio indicates 4: 3, in S11, the control unit 14 outputs the first and second aspect ratio control signals F or G corresponding thereto, and the picture tube 8 Is set to that value, and the process goes to S8. On the other hand, if YES in S6, that is, if there is a user control signal regarding the aspect ratio, it is determined in S12 whether the aspect ratio of the user control signal D indicates 4: 3 or 16: 9. As a result, when the aspect ratio is 4: 3,
Proceed to S11, where the aspect ratio is 4: 3 as described above.
When the aspect ratio is set to 16: 9, the process goes to S10, and the aspect ratio is set to 16: 9 as described above.

If the control signal SW2 is low in S4, that is, if the input mode indicates the TV mode, the mode changeover switch 5 is set to the TV mode by a command from the control unit 14 in S13. The TV signal A is input to the video signal processing unit 7. Then, in S14, it is determined whether or not the aspect ratio has been switched based on the user control signal D. If NO, that is, if there is no aspect ratio switching, the process returns to S3. That is, when the aspect ratio is switched, whether the aspect ratio of the user control signal D indicates 4: 3 in S15
It is determined whether the aspect ratio indicates 6: 9. As a result, if the aspect ratio indicates 4: 3, the process proceeds to step S11, where the aspect ratio is set to 4: 3. The process proceeds to S10, where the aspect ratio is set to 16: 9.

On the other hand, in the case of YES in S3,
That is, when there is an input switching instruction from the user, it is determined in S16 whether the user control signal D indicates the TV mode or the external input mode.
If the mode is indicated, the flow goes to S13 to actually set the TV mode. On the other hand, when the external input mode is indicated, the EXT flag indicating the external input mode is set to 1 in S17, and the process goes to S5 to actually set the external input mode. In S8, E
It is determined whether the XT flag is 1 or not, and if YES, the process returns to S16. As described above, in this embodiment, even after the aspect ratio of the screen size is automatically switched by the control signal C of the external input, the aspect ratio can be further switched by the user control signal D. In the above embodiment, a television receiver compatible with Europe has been described as an example. However, the present invention can be applied to any receiver in which the aspect ratio of the screen size is automatically switched by an external input. Of course.

[0019]

As described above, according to the television receiver of the present invention, the following excellent functions and effects can be exhibited. The control unit is in external input mode.
Information based on the aspect ratio obtained by the comparator.
To change the screen size aspect ratio.
Supply the aspect ratio control signal to the object ratio change circuit
Switch the aspect ratio to
To change the screen size aspect ratio
When the control signal is input, the user
Control signal prioritized in the aspect ratio change circuit
To provide a high aspect ratio control signal.
Therefore, even if the screen size is automatically set to a predetermined aspect ratio by a control signal from an external input, the user can switch to another aspect ratio. The control supplied from the external input terminal
Information about the screen size aspect ratio by the
When there is a change, the screen by the control signal
Aspect based on information about size aspect ratio
New aspect ratio control signal
Since the configuration is such that the aspect ratio is supplied at the time of external input, even if the user is confused about the aspect ratio, the original aspect ratio can be restored by the fluctuation of the control signal of the external input.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a television receiver according to the present invention.

FIG. 2 is a circuit diagram showing a comparison unit of the television receiver shown in FIG.

FIG. 3 is a flowchart for explaining the operation of the television receiver of the present invention.

[Explanation of symbols]

1. Television receiver, 5. Mode switch, 6.
Aspect ratio changing circuit, 7: video signal processing unit, 8: picture tube, 10: external input / output terminal, 13: comparison unit, 14 ...
Control unit, 18: user input unit, 19: deflection circuit, C: control signal, D: user control signal, F: first aspect ratio control signal, G: second aspect ratio control signal.

Claims (1)

(57) [Scope of request for utility model registration] 1. A television receiver, comprising: a tuner for receiving a television signal; an external input terminal for inputting a video signal from outside; a video signal obtained by the tuner;
Selectable switching between video signals input from the terminal
And a television which is an image from the tuner.
Mode and external input which is video from the external input terminal
Mode switching mode to switch the input mode between
And a control signal supplied from the external input terminal.
By comparing with the reference voltage,
Information about the aspect ratio of the screen size of these video signals
A comparing portion for obtaining a aspect ratio of the screen size switching and the input mode
User inputting a user control signal for switching
The input mode is switched by a user input unit and the user input unit.
When a user control signal is input,
While controlling to switch the changeover switch section,
Information on the aspect ratio obtained by the comparison section
For changing the aspect ratio input from the user input section
One of the user control signals
To switch the screen size aspect ratio.
A control unit for outputting a aspect ratio control signal, based on the aspect ratio control signal from the control unit
To change the screen size aspect ratio
A ratio changing circuit, wherein the control unit performs the comparison in the external input mode.
Screen with information about the aspect ratio obtained by the
The aspect ratio can be changed to switch the size aspect ratio.
Supply the aspect ratio control signal to the ratio change circuit
After switching the aspect ratio, the
To change the screen size aspect ratio
When the control signal is input, the user
Control signal to the aspect ratio change circuit
When a new aspect ratio control signal is supplied,
The control signal supplied from the external input terminal
Information about the screen size aspect ratio
The size of the screen by the control signal.
The aspect ratio based on information about the aspect ratio
Supply a new aspect ratio control signal to the change circuit
A television receiver.