JPH0879650A - Picture display controller - Google Patents

Abstract

PURPOSE: To set a tube surface display position to be constant and to prevent a V-jitter at the time of a non-standard mode by deciding a tube surface display vertical position corresponding to an updated scroll value when the scroll value is updated. CONSTITUTION: Registers 6A and 6B store data corresponding to a position in the vertical direction and a position in a horizontal direction of the tube surface display position. A register 6C stores the scroll value outputted to a D/A converter 20. When the scroll value stored in the register 6C is updated to a new value, the tube surface display vertical position stored in the register A is updated in accordance with the updated scroll value. A tube surface display signal generation circuit 6D generates a tube surface display signal synchronously with a signal V. Even if the scroll value is changed, the tube surface display position can be set to prescribed height and the occurrence of the V-jitter at the time of the non-standard mode can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display control device suitable for use in, for example, a television receiver.

[0002]

2. Description of the Related Art The screen of a normal NTSC television broadcast has an aspect ratio of 4: 3 as shown in FIG. On the other hand, in a high-definition television system such as a high-definition television, its aspect ratio is set to 16: 9.

When an image having an aspect ratio of 4: 3 as shown in FIG. 9A is displayed as it is on a 16: 9 screen,
As shown in FIG. 9B, there are regions on the left and right of the screen where no image is substantially displayed.

Therefore, in order to eliminate the left and right substantially non-displayed areas, for example, as shown in FIG.
As shown in (c), an image with an aspect ratio of 4: 3 is
A 16: 9 aspect ratio screen is displayed in the left-right direction. However, in this case, a part of the upper and lower images will be projected out of the screen and will not be actually displayed. As a result, for example, subtitles displayed in the lower left part of the screen (represented by numbers 1 to 5 in FIG. 9) run off the screen,
It will not be displayed.

Therefore, it is conceivable to scroll the display image vertically. For example, as shown in FIG. 10, subtitles displayed in the lower left of the screen (in this example,
In the case where "Wide TV" characters are displayed in a half-missed state, scroll the display image upwards to display subtitles completely inside the screen, for example, as shown in FIG. You can On the other hand, when it is desired to display the subtitles outside the screen, the display image may be scrolled downward as shown in FIG.

In order to scroll the display image vertically with respect to the screen, the phase of the vertical synchronizing signal (deflection V) supplied to the deflection yoke (not shown) of the CRT for displaying the image is changed to
The vertical synchronization signal (signal V) one field before included in the video signal may be shifted by an amount corresponding to the scroll amount of the screen.

FIG. 13 shows this principle. That is,
The lowermost display position in the vertical direction of the screen is substantially defined by the generation timing of the deflection V. In other words, the image by the horizontal scanning line that temporally precedes the deflection V by the length corresponding to the vertical direction of the screen becomes the image actually displayed on the screen as the effective screen R.

Therefore, the phase shift between the leading edge of the deflection V and the trailing edge of the signal V that is one field (one screen unit) before is:
The scroll amount corresponds to the vertical shift of the screen.
When this phase shift (scroll amount) is small, the upper part of the image is displayed on the CRT as shown on the right side in FIG. On the other hand, when the scroll amount increases, the lower part of the image is displayed as shown on the left side in FIG. Therefore, by appropriately adjusting the phase of the deflection V with respect to the signal V, the display position of the screen can be scroll-adjusted in the vertical direction.

Further, in the case of displaying a character such as a receiving channel on the screen for such a video signal (for example, in the example of FIG. 13, the video signal of the 12th channel is received and displayed). Therefore, the number 12 is displayed on the upper right of the screen.) The microcomputer built into the television receiver generates a screen display signal (OSD signal) for displaying this character and superimposes it on the video signal. I am trying to display it.

This tube surface display signal is generated with reference to the deflection V. For example, the display corresponding to the tube surface display signal is performed from the position of a predetermined number (for example, m-th) horizontal scanning line (mH) from the trailing edge of the deflection V. This screen display is
Since the deflection V is used as a reference, even if the scroll amount is adjusted, the display position of the image by the display signal on the tube surface does not change and is always displayed at a constant height position on the screen.

However, when a VTR is set to a pause mode (pause mode) and a still image is reproduced and displayed with respect to a television receiver having such a scroll function, the display position of the screen display is changed. So-called V jitter, which is a shake in the vertical direction, occurs.

That is, as shown in FIG. 14, in the video signal in the non-standard mode such as the case in the pause mode, the number of horizontal scanning lines in the odd (ODD) field and the number in the even (EVEN) field are increased. The number of horizontal scan lines does not match. That is, the odd fields and even fields have different lengths (intervals of the signals V).

Since the deflection V is generated in phase synchronization with the signal V, if the interval of the signal V is different between the odd field and the even field, the interval of the deflection V is also different between the odd field and the even field. It will be different. In other words, the generation timing of the deflection V corresponds to the generation timing of the signal V.

Therefore, as shown in FIG. 14, when a tube surface display signal is generated so as to display a tube surface at the position of the mth horizontal scanning line from the trailing edge of the deflection V, for example,
The display position in the vertical direction is different between the odd field and the even field. That is, the effective screen R
Is substantially defined by the r horizontal scanning lines preceding the deflection V from the leading edge of the deflection V, the vertical relative position of the tube surface display signal in the effective screen is an odd number. The positions are different in the field and the even field. Therefore, V jitter is generated.

Therefore, for example, as shown in FIG. 15, the generation timing of the tube surface display signal is set to the signal V, not the deflection V.
Can be considered as a standard.

[0016]

However, when the tube surface display signal is simply generated with reference to the signal V as described above, as shown in FIG. 15, the position of the tube surface display is changed by the scroll amount. There was a problem that it changed to a different position each time.

The present invention has been made in view of such a situation. Even when the scroll amount is changed, the display position of the tube surface can be made constant, and at the same time, in the non-standard mode. This is to prevent the occurrence of V jitter.

[0018]

The image display control apparatus of the present invention comprises an output means for outputting a video signal (for example, A in FIG. 1).
V switch 3) and a generating means for generating a screen display signal in synchronization with the signal V which is a signal in phase with the vertical synchronizing signal included in the video signal (for example, the screen display signal generating circuit 6 in FIG. 1).
D), the video signal output from the output unit, and the tube surface display signal generated by the generation unit, and supplies the combined signal to the display unit (eg, CRT 15 in FIG. 1) (eg, signal processing in FIG. 1). A circuit 24), a scroll value storage means (for example, register 6C in FIG. 1) for storing a scroll value corresponding to a vertical scroll position of an image displayed on the display unit, and a signal V which is synchronized with the signal V. On the other hand, a generation unit that generates a deflection V that is a signal in phase with a vertical synchronization signal that serves as a reference for vertical display on the display unit and that has a phase shift corresponding to the scroll value stored in the scroll value storage unit. (For example, the V-scroll circuit 12 and the oscillation circuit 25 in FIG. 1) and a tube surface display vertical position storage unit (for example, a tube surface display vertical position storage unit that stores a tube surface display vertical position which is a vertical display position of the tube surface display signal). When the scroll value of the register 6A) of FIG. 1 and the scroll value storage means is updated, the scroll value is updated corresponding to the updated scroll value so that the vertical display position of the display unit of the display signal is not changed. And a determination means (for example, the table 6E in FIG. 1) for determining the vertical display position on the tube surface.

The vertical screen display vertical position stored in the vertical screen display vertical position storage means corresponds to the scroll value stored in the scroll value storage means in units of one screen (for example, 1
It can be updated with a delay of (field).

Further, the scroll value and the vertical display position on the screen can be defined by the number of horizontal scanning lines of the image displayed on the display section.

[0021]

In the image display control device having the above structure, when the scroll value stored in the register 6C is updated to a new value, the vertical screen display position stored in the register 6A is also updated. Updated according to the value. The screen display signal generating circuit 6D generates a screen display signal in synchronization with the signal V. Therefore, even when the scroll value is changed, the display position of the tube surface can be set to a constant height and the occurrence of V jitter in the non-standard mode can be prevented.

[0022]

1 shows an example of the configuration of a television receiver to which an image display control device of the present invention is applied. The U / V tuner 2 uses the RF signal input from the antenna 1 to
The UHF band signal or the VHF band signal of a predetermined channel is received and demodulated, and the demodulated output is output to the AV switch 3
Output to. Further, the BS tuner 5 receives and demodulates a BS broadcast of a predetermined channel from the signal input from the antenna 4, and outputs the demodulated output to the AV switch 3. The VTR 22 also plays on this AV switch 3,
The output signal is also supplied.

The AV switch 3 includes U / V tuners 2 and B.
One of the video signals input from the S tuner 5 or the VTR 22 is selected, and the selected video signal is output to the sampling circuit 23. The sampling circuit 23 is A
The vertical synchronizing signal (V) and the horizontal synchronizing signal (H) included therein are separated from the video signal input from the V switch 3, and the separated vertical synchronizing signal is used as a signal V, and the V scroll circuit 12 and the switch 21 are provided. It is output to the contact b. The V scroll circuit 12 generates a vertical synchronizing signal having a phase shift (delay time) corresponding to the scroll amount designated by the main microcomputer 6 via the D / A converter 20 with respect to the signal V. To the oscillation circuit 25 of the video processor 13.

The oscillator circuit 25 synchronizes with the phase-shifted vertical synchronizing signals inputted from the V-scrolling circuit 12,
Deflection yoke (DY) for deflecting the electron beam of the CRT 15
A vertical synchronization signal (deflection V) to be supplied to 14 is generated. The deflection V is supplied to the deflection yoke 14 and also to the contact a of the switch 21. Oscillator circuit 25
Also generates a horizontal synchronization signal (deflection H) to be supplied to the deflection yoke 14 in synchronization with the horizontal synchronization signal supplied from the sampling circuit 23.

The signal processing circuit 24 of the video processor 13
For the video signal supplied from the sampling circuit 23,
In addition to controlling picture and brightness, processing such as image distortion correction is performed, and the RGB signal is converted and output to the CRT 15.

The AV switch 3 receives the input signal from
The audio signals of the left and right channels (L and R channels) are separated and output to the audio processor 16. The audio processor 16 adjusts the volume, balance, sound quality, and the like of the input audio signal, and then outputs it to the speaker 18 via the amplifier 17.

The main microcomputer 6 has a BS microcomputer 8, a memory 9, an AV switch 3, a video processor 13, an audio processor 16 and a D / A via an I ² C bus 7.
It is connected to the converters 19 and 20 and adapted to control them. The memory 9 stores various data necessary for the main microcomputer 6 to perform various processes. The BS microcomputer 8 is controlled by the main microcomputer 6 and controls the BS tuner 5. D / A converter 19
Is controlled by the main microcomputer 6 to generate a frame signal for preventing glare at the top and bottom of the screen.
Is output to the signal processing circuit 24.

A predetermined command can be input to the main microcomputer 6 by operating the key 10 or the remote controller 11.

The tube surface display signal generation circuit 6D of the main microcomputer 6 generates a tube surface display (OSD) signal based on the signal supplied from the switch 21 and outputs it to the signal processing circuit 24 of the video processor 13. ing. Registers 6A and 6B of the main microcomputer 6 store the numbers of horizontal scanning lines and pixels that define the vertical and horizontal positions of the screen display, respectively.

That is, the registers 6A and 6B are, for example, as shown in FIG.
As shown in, the vertical position (coordinates) of the screen display position
Data corresponding to Y and the horizontal position (coordinate) X is stored. The register 6C stores the scroll value output to the D / A converter 20.

Further, the main microcomputer 6 stores a table for displaying the vertical surface of the screen corresponding to the scroll value so that the screen display position can be kept constant even when the scroll value is changed. It has 6E.

Next, the operation will be described with reference to the timing chart of FIG. When the key 10 or the remote controller 11 is operated to instruct the main microcomputer 6 to receive, for example, a predetermined channel of broadcasting of a predetermined VHF band, the main microcomputer 6 controls the U / V tuner 2 and responds to the command. A predetermined channel in the VHF band to be received is received. The U / V tuner 2 receives the broadcast of the channel corresponding to the command, and outputs the demodulated output to the AV switch 3.

The AV switch 3 is controlled by the main microcomputer 6 via the I ² C bus 7, selects the output of the U / V tuner 2, outputs the video signal to the sampling circuit 23, and outputs the audio signal. Output to the audio processor 16.

The extracting circuit 23 extracts the vertical synchronizing signal contained in the input video signal (FIG. 3A) and outputs it as the signal V (FIG. 3C) to the V scroll circuit 12. The V scroll circuit 12 outputs the signal V to a predetermined number (n
This signal is delayed by the horizontal scanning line (stored in the register 6C) and is output to the oscillation circuit 25 as a vertical synchronizing signal whose phase is shifted. The oscillation circuit 25 receives the vertical synchronization signal supplied from the V scroll circuit 12 and the sampling circuit 23.
In synchronism with the horizontal sync signal supplied from
(B)) and the deflection H are generated and supplied to the deflection yoke 14.

On the other hand, the signal processing circuit 24 includes a sampling circuit 23.
The supplied signal is processed according to the command from the main microcomputer 6, and is output to the CRT 15 as an RGB signal. As a result, the video image of the channel received by the U / V tuner 2 is displayed on the CRT 15.

On the other hand, the audio processor 16 uses the AV
The audio signal supplied from the switch 3 is subjected to processing such as volume, balance, and sound quality in response to a command from the main microcomputer 6, and is output from the speaker 18 via the amplifier 17.

Further, when the key 10 or the remote controller 11 is operated to instruct the scrolling of the image upward or downward, the scroll value (the number of horizontal scanning lines n) corresponding to the scroll amount is registered in the register of the main microcomputer 6. 6C
Memorized in. The main microcomputer 6 uses this register 6C
The scroll value stored in the D / A converter 2 is read out.
Supply 0. The D / A converter 20 converts this data into an analog signal and outputs it to the V scroll circuit 12.
The V scroll circuit 12 sets the delay amount of the vertical synchronization signal output to the oscillation circuit 25 in accordance with the signal input from the D / A converter 20.

In this way, as described above with reference to FIG. 13, the image displayed on the CRT 15 can be scrolled upward or downward.

On the other hand, the main microcomputer 6 switches the switch 21 to the contact b side when the AV switch 3 selects any video signal and supplies it to the sampling circuit 23 (when the video signal exists). Therefore, the sampling circuit 2
The signal V generated in 3 is supplied to the tube surface display signal generation circuit 6D of the main microcomputer 6 as the tube surface display V that serves as a reference for generating the tube surface display signal.

The tube surface display signal generation circuit 6D of the main microcomputer 6 uses the tube surface display V as a reference, and outputs the number (m) of horizontal scanning lines stored in the register 6A from the tube surface display V. At the timing of counting, and at the timing of counting the number of pixels stored in the register 6B in the horizontal scanning line, the R for tube surface display is displayed.
The GB signal is generated and output to the signal processing circuit 24 of the video processor 13.

The signal processing circuit 24 synthesizes the RGB signal for tube surface display input from the tube surface display signal generating circuit 6D with the RGB signal of the video signal input from the AV switch 3 through the sampling circuit 23, Output to CRT15. As a result, an image (for example, the number “12” representing the receiving channel shown in FIG. 13) corresponding to the screen display signal generated by the main microcomputer 6 is displayed on the CRT 15 while being superimposed on the video image.

AV switch 3 is BS tuner 5 or V
The same operation is performed when the video signal from TR22 is selected and output.

By the way, for example, when the VTR 22 is in the temporary stop mode state and the still image is reproduced and output from the mounted magnetic tape, the main microcomputer 6 is
The switch 21 is switched to the contact b side, and the signal V as the V for the screen display is supplied to the screen display signal generating circuit 6D.
At this time, as described above, the V scroll circuit 1
The interval of the signal V input to 2 is different between the odd field and the even field.

As shown in FIG. 4, the tube surface display signal generating circuit 6D uses the signal V supplied from the switch 21 as a reference, and the tube surface at the position of the mth horizontal scanning line from the trailing edge of this signal V. Generates a display signal. However, in both the odd field and the even field, the width from the trailing edge of the signal V to the leading edge of the deflection V is constant at nH, and the tube surface display signal is superimposed on the head m-th horizontal scanning line. , Of the n horizontal scanning lines form the effective screen R by the latter half of the horizontal scanning lines, the vertical position of the screen display signal in the effective screen is constant. Therefore, V jitter of the display signal on the screen does not occur in the non-standard operation mode.

The above principle is applied when the AV switch 3 outputs a normal (standard mode) video signal.
That is, the same applies when the number of horizontal scanning lines in the odd field and the even field is equal. Therefore,
Even in this case, the vertical position of the screen display is constant.

On the other hand, when the AV switch 3 is not outputting a video signal, the main microcomputer 6 switches the switch 21 to the contact a side. As a result, the deflection V output by the oscillation circuit 25 is supplied to the tube surface display signal generation circuit 6D as the tube surface display V.

That is, the V scroll circuit 12 cannot detect the vertical synchronizing signal included in the video signal when the video signal is not input from the AV switch 3. In this case, the oscillation circuit 25 outputs the signal generated by the built-in PLL circuit in the free-run state as the deflection V. The cycle of the deflection V is set to 56 Hz, which is slightly lower than the cycle of the vertical synchronizing signal in the standard operation state (when there is a normal video signal), for example, 60 Hz.

In this case, the tube surface display signal generating circuit 6D
Although the screen display signal is generated with the deflection V as a reference, the period is constant and no video signal exists, so that the signal V does not exist, and the CRT of the screen display signal is generated.
The vertical display position of 15 is constant.

However, when the screen display signal is generated with the signal V as a reference in the presence of the video signal in this way, if the scroll value is constant, the screen display vertical position is constant, but the scroll is performed. When the value is changed, the vertical display position on the screen changes as described with reference to FIG. Therefore, in this embodiment, when the scroll value is changed, the vertical display surface position corresponding to the scroll value (a value for keeping the vertical display surface position constant) is set in the register 6A. Has been done.

That is, as shown in FIG. 5, the table 6E stores the vertical display surface position corresponding to the scroll value. When the vertical display surface position is set in accordance with the scroll value stored in the table 6E, the vertical display surface position is preliminarily calculated to be constant regardless of the scroll value.

That is, the scroll value and the vertical display position on the screen have a relation expressed by the following equation. Vertical screen display position = Vertical screen display vertical position for scroll 0-
Scroll Value In this embodiment, the vertical display position of the scroll 0 is set to 10.

Therefore, for example, as shown in FIG. 6, when the scroll value is +5, the vertical position of the screen display is 5 (= 1.
0-5). That is, as shown on the right side of FIG. 6, when the scroll value is set to +5, the vertical display position on the screen is +5.

On the other hand, for example, the scroll value is -5.
When set to, the vertical position of the screen display is 15 (= 10-(-
5)). That is, as shown on the left side of FIG. 6, when the scroll value is set to -5, the vertical position of the screen display is +1.
It is set to 5.

In the example shown in FIGS. 13 and 15, the interval between the leading edge of the deflection V and the trailing edge of the signal V one field before is defined as the scroll amount. In the example, this scroll amount is defined as a value in the positive direction and a value in the negative direction with reference to a predetermined reference position (the position where the vertical display surface position is 10). However,
This scroll value corresponds to the scroll amount, and there is no essential difference between the two.

When a new scroll value (scroll amount) is stored in the register 6A by operating the key 10 or the remote controller 11, the main microcomputer 6 refers to the table 6E and displays the scroll value corresponding to the scroll value. The plane display vertical position is read out and stored in the register 6A. Then, at the timing stored in the register 6A, the screen display signal generation circuit 6D generates a screen display signal. Therefore, as shown in FIG. 6, even if the scroll value is changed, the vertical display position on the screen is always constant.

In this embodiment, the table 6E is used.
The scroll value and the vertical screen display position are stored in the table. However, each time a new scroll value is input, the corresponding vertical screen display position may be calculated and determined according to the above formula. It is possible.

Next, the timing for updating the scroll value stored in the register 6C and the timing for updating the vertical screen display position stored in the register 6A will be described.

As shown in FIG. 7, the scroll value stored in the register 6C and the vertical display surface position stored in the register 6A are updated in synchronization with the deflection V. In this example, the value of the vertical display surface position in the register 6A from m to g is updated at the same time as the scroll value in the register 6C is updated from n to f.

The main microcomputer 6 is operated by the user by pressing the key 1
When 0 or the remote controller 11 is operated to instruct to change the scroll value, the value of the register 6C is updated from n to f in synchronization with the deflection V. Then, the data corresponding to the new scroll value f is output to the D / A converter 20,
An analog signal corresponding to the scroll value f is output from the D / A converter 20 to the V scroll circuit 12.

[0060] At time t _1, thus, the scroll value of the register 6C is updated from n to f, V scroll circuit 12 deflected from the signal V at time t ₂ to be supplied immediately after the time t ₁ The count number of horizontal scanning lines for generating V is changed from n up to that time to f. Therefore, the V scroll circuit 12 generated the deflection V at the timing of time t _{3 when} n horizontal scanning lines were counted from the time t ₂ in the immediately preceding field, but in this field, Since the scroll value is updated from n to f, at time t ₄ at the timing of counting f horizontal scanning lines from time t ₂ ,
Deflection V is generated.

However, the display timing of the field starting from the signal V at the time t ₂ on the CRT 15 is already defined in relation to the deflection V generated at the timing at the time t ₁ (the image in this field is The scanning has already started from time t _{1 at} the time when the deflection V is generated at time t ₃ .

That is, in FIG. 7, CR is displayed so that the image of the effective screen R ₁ corresponding to the deflection V at time t ₃ is displayed.
The scanning at T15 starts from time t ₁ . However, actually, in this field, the deflection V does not occur at time t ₃ but the deflection V occurs at time t ₄ , so the horizontal scanning itself does not occur until the deflection V actually occurs at time t ₄ . , Is further executed below the effective screen R ₁ . However, the image corresponding to the horizontal scanning line in the range from the time t ₃ to the time t ₄ is an area outside the effective screen R ₁ and thus is not actually displayed.

Thus, in this field,
At time t ₄ , the deflection V is generated.
The image of the effective screen R ₂ defined on the basis of is not displayed.

On the other hand, the data of the vertical display surface position stored in the register 6A is also at time t ₁ .
Since the value is updated from m to g, the tube surface display signal generation circuit 6D generates a tube surface display signal at the timing of counting g horizontal scanning lines from the signal V at time t ₂ . As described above, the screen display vertical position data g is a value adjusted so that the screen display vertical position is constant when the scroll value is f.

Therefore, if the image of the effective screen R ₂ is displayed in this field, the number L ₁ of horizontal scanning lines from the upper end to the vertical position on the tube surface display is
It is equal to the number of scan lines L ₁ in the immediately preceding field. However, as described above, in this field, the image of the effective screen R ₁ is displayed instead of the image of the effective screen R ₂ . As a result, the number of horizontal scanning lines from the top of the effective screen to the vertical position on the screen is L ₂ , and L _{1 is} L _1.
Will be a different value from. That is, V jitter is generated.

Therefore, in the present embodiment, as shown in FIG. 8, the updating of the data of the vertical position on the screen 6A of the register 6A is performed by 1 for the scroll value of the register 6C.
It is delayed by the field (one screen unit).

That is, when the scroll value of the register 6C is updated from n to f in synchronism with the deflection V generated at the timing of time t ₁ , the value of the vertical position on the screen display of the register 6A is changed to the time t _1. The value is updated from m to g in synchronization with the deflection V that occurs one field later at time t ₄ .

In this way, at the timing of time t ₂ , the vertical display surface position stored in the register 6A is still m, so that m vertical lines from the trailing edge of the signal V at time t ₂ . The tube surface display signal generation circuit 6D generates a tube surface display signal at the timing when the number of horizontal scanning lines is counted. Therefore, in this case, the number of horizontal scanning lines from the upper end of the effective screen R ₁ to the horizontal scanning line at the vertical display position on the screen is L ₁ , which is the same as the vertical display screen position on the field immediately before.

[0069] Then, at time t ₄ when counting the number of f the horizontal scanning lines from the time t _2, the the deflection V is generated, the deflection V is the signal V which will be generated at time t ₅ In the relationship, the effective screen corresponding to the scroll value f is displayed. Then, in this field, the data of the vertical display surface of the register 6A is updated from m to g. As a result, when the number of horizontal scanning lines g is counted from the trailing edge of the signal V at time t ₅ , and the tube surface display signal generation circuit 6D generates a tube surface display signal, the upper end of the screen at the display position is displayed. The number of horizontal scanning lines from the section is L ₁ , which is the same as the number in the fields so far. That is, V jitter does not occur.

When the vertical synchronizing signal is generated in frame units, one screen unit is one frame.

The case where the present invention is applied to a television receiver has been described above as an example, but the present invention can also be applied to the case where other devices display a screen image by superimposing it on a video image. Is.

[0072]

As described above, according to the image display control apparatus of the present invention, when the scroll value is updated, the vertical position of the screen display corresponding to the updated scroll value is determined. It is possible to prevent V jitter of the display surface of the screen, and at the same time, it is possible to keep the vertical display position of the display constant even when the scroll value is changed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of a television receiver to which an image display control device of the present invention is applied.

FIG. 2 is a diagram illustrating a display surface position on a tube.

FIG. 3 is a timing chart explaining the operation of the embodiment of FIG.

FIG. 4 is a timing chart for explaining the operation of the embodiment of FIG. 1 in the non-standard operation mode.

5 is a diagram for explaining the stored contents of a table 6E in FIG.

FIG. 6 is a diagram illustrating a relationship between a screen display position and a scroll value when data is corrected.

FIG. 7 is a diagram illustrating a relationship between a scroll value, an update timing of a vertical surface display position, and a vertical display position.

FIG. 8 is a diagram illustrating another relationship between the scroll value, the update timing of the vertical display position on the screen and the display position on the screen.

FIG. 9 is a diagram illustrating a display example of screens having different aspect ratios.

FIG. 10 is a diagram showing an example of a screen in which half the subtitles are missing.

FIG. 11 is a diagram showing a state in which an image displayed on the screen is scrolled upward.

FIG. 12 is a diagram showing a state in which an image displayed on the screen is scrolled downward.

FIG. 13 is a diagram illustrating the principle of scrolling.

FIG. 14 is a diagram illustrating the occurrence of V-jitter on the screen display in the pause mode operating state.

FIG. 15 is a diagram illustrating a change in the display surface position on the screen corresponding to the scroll amount.

[Explanation of symbols]

 2 U / V tuner 3 AV switch 5 BS tuner 6 Main microcomputer 6A, 6B, 6C Register 6D Tube surface display signal generation circuit 6E Table 12 V scroll circuit 13 Video processor 14 Deflection yoke 15 CRT 16 Audio processor 18 Speaker 19, 20 D / A converter 21 Switch 22 VTR 23 Extraction circuit 24 Signal processing circuit 25 Oscillation circuit

Claims (3)

[Claims] 1. Output means for outputting a video signal; generating means for generating a screen display signal in synchronism with a signal V which is a signal in phase with a vertical synchronizing signal included in the video signal; and the output means. Synthesizing the output video signal and the tube surface display signal generated by the generating means,
A synthesizing means for supplying to the display section, a scroll value storage means for storing a scroll value corresponding to a vertical scroll position of an image displayed on the display section, and a signal for synchronizing with the signal V and for the signal V. On the other hand, the deflection V, which is a signal in phase with the vertical synchronization signal serving as a reference for vertical display on the display unit, having a phase shift corresponding to the scroll value stored in the scroll value storage means is generated. Generating means, a tube surface display vertical position storage means for storing a tube surface display vertical position which is a display position in the vertical direction of the tube surface display signal, and when the scroll value of the scroll value storage means is updated, In order not to change the vertical display position of the display unit due to the screen display signal, the screen display vertical position updated corresponding to the updated scroll value is set. An image display control device, comprising: a determining unit for determining. 2. The pipe surface display vertical position stored in the pipe surface display vertical position storage means is 1 with respect to the scroll value stored in the scroll value storage means.
The image display control device according to claim 1, wherein the image display control device is updated with a delay of a screen unit period. 3. The image according to claim 1, wherein the scroll value and the vertical display position on the tube surface are defined by the number of horizontal scanning lines of the image displayed on the display unit. Display controller.