JPH08314421A - Display device and display panel driving method - Google Patents

Abstract

PURPOSE: To reproduce and display a video signal on a central part of a display screen without distortion by providing a display control means making the video signal supplied from a signal supply means display on the central part of the screen of an aspect ratio 3:4 at the aspect ratio 9:16 and making areas of prescribed colors display on the upper part and the lower part of the central part. CONSTITUTION: When a wide display is performed on a liquid crystal display panel 19, for displaying the image of the aspect ratio 9:16, black is displayed on upper/lower respective 30 pieces of scanning lines, and the video is displayed on central 174 pieces of the lines. This video is formed so that one piece of four pieces among 232 scanning lines of 26-th to 257-th scanning lines among 262 pieces of scanning lines per one field is thinned. Then, black belts (masks) are displayed on the upper/lower 30 scanning lines. However, a non-display period of a TV signal is nearly 30 horizontal scanning period, and no black is displayed on non-display period 60 scanning lines in a simple driving method. Then, only the black belts are written in plural scanning lines simultaneously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device and a display panel driving method capable of displaying video signals having different aspect ratios in a central portion of a screen without distortion and masking the periphery thereof.

[0002]

2. Description of the Related Art Recently, a so-called wide television having a screen (aspect ratio of 9:16) which is horizontally longer than a normal NTSC system television image (aspect ratio of 3: 4) has been developed, and is also used for practical broadcasting. Has been started.

In response to such a background, a video camera having a shooting mode for wide television has been developed as a video camera.

In this type of video camera, the data of an image pickup device having a size of 9:16 screen is recorded on a video tape or the like in the same manner as a ratio of 3: 4, and at the time of reproduction, it is output to a wide television and is as it is. By displaying (that is, displaying the data for the aspect ratio of 3: 4 on the screen of the aspect ratio of 9:16), the image is displayed with the aspect ratio of 9:16.

[0005]

Therefore, when an image recorded in this mode is output to a television having a screen having a normal aspect ratio of 3: 4, the image becomes a horizontally compressed image. Will end up.

Similarly, since the aspect ratio of the screen of the liquid crystal display panel used for the monitor of the video camera is 3: 4, when it is displayed as it is, a distorted image is compressed in the horizontal direction.

The present invention has been made in view of the above circumstances, and a display device and a display panel capable of displaying a video signal having an aspect ratio in the central portion of the screen without distortion and masking the periphery thereof. It is an object of the present invention to provide a driving method of the.

[0008]

In order to achieve the above object, a display device according to a first aspect of the present invention comprises a display panel having a screen with an aspect ratio of substantially 3: 4.
A signal supplying means for supplying a video signal having an aspect ratio of a display image of 9:16, and a video signal supplied from the signal supplying means, which is connected to the display panel and the signal supplying means, is substantially provided in a central portion of the screen. And a display control means for displaying an area of a predetermined color on the upper and lower parts of the central part.

In order to achieve the above object, the second aspect of the present invention
A display device according to the above aspect has a display panel having a screen with an aspect ratio of substantially 3: 4, and a first video signal having a display image aspect ratio of 3: 4 and a display image aspect ratio of 9:16. Signal supply means for supplying the second video signal, the display panel and the signal supply means, and the first video signal according to the signal supplied from the signal supply means to the display panel. Is displayed substantially in front of the screen, the second video signal is displayed in the center of the screen with an aspect ratio of substantially 9:16, and a predetermined color area is provided above and below the center. And a display control means for displaying.

In order to achieve the above object, the third aspect of the present invention
According to another aspect of the present invention, there is provided a display device, a display unit, a supply unit that supplies a video signal having an aspect ratio of a display image of I: J, and the display panel and the supply unit. The video signal is thinned out in units of scanning lines at a predetermined rate so that the image is displayed in the center portion of the screen of the display panel with an aspect ratio of I: J, and a plurality of scanning lines above and below the central portion are simultaneously displayed. It is characterized by comprising display control means for displaying a predetermined color on the upper part and the lower part of the central part by writing the predetermined color.

In order to achieve the above object, the fourth aspect of the present invention
In the display device according to the above aspect, a display panel, a video supply unit that supplies a video signal with an aspect ratio of the display image of I: J, and a character signal corresponding to the video signal with an aspect ratio of the display image of I: J. It is connected to the character supplying means for supplying, the display panel, the image supplying means and the character supplying means, and according to the image signal, the image signal is thinned out in scanning line units at a predetermined ratio, and The image is displayed substantially in the aspect ratio of I: J at the center of the screen, and the character signal is displayed at a position where the scanning lines are not thinned according to the character signal, and the upper and lower parts of the center are displayed. And a display control means for displaying a predetermined color on the upper part and the lower part of the central part by simultaneously writing the predetermined color on the plurality of scanning lines. To.

In order to achieve the above object, the fifth aspect of the present invention
In the display device according to the above aspect, a display panel, a video supply unit that supplies a video signal with an aspect ratio of the display image of I: J, and a character display range are set for the video signal with an aspect ratio of the display image of I: J. Connected to the display panel, the video supply means, and the character supply means for supplying the character signal, and thinning out the video signal at a predetermined rate in units of scanning lines according to the video signal, A character is displayed substantially in the aspect ratio of I: J at the center of the screen of the display panel, and the character is displayed in the character display range set by the character signal without thinning out the scanning line according to the character signal. Is displayed, and a predetermined color is simultaneously written on a plurality of scanning lines above and below the central portion, so that the upper and lower portions of the central portion are displayed. Display control means for displaying the Teiiro,
It is characterized by being configured.

In order to achieve the above object, the sixth aspect of the present invention
In the display panel driving method according to the above aspect, a video signal having an aspect ratio of a display image of 9:16 is received, and the video signal is thinned out in scanning line units at a predetermined ratio according to the video signal. Is displayed at an aspect ratio of 9:16 substantially in the center of the screen, and areas of a predetermined color are displayed at the upper and lower portions of the center, and writing of the area of the predetermined color is simultaneously performed by a plurality of scanning lines. It is characterized by:

In order to achieve the above object, the seventh aspect of the present invention
In the display panel driving method according to the above aspect, a video signal having an aspect ratio of a display image of I: J is received, and the video signal is thinned out in scan line units at a predetermined ratio in accordance with the video signal. Of the screen of K: L size is displayed in the center of the screen with an aspect ratio of I: J, and regions of a predetermined color are displayed on the upper and lower parts of the center, and the writing of the region of the predetermined color is performed a plurality of times. The scanning lines are simultaneously executed.

A normal display panel has a screen size of 3: 4 in height and width according to the standard of NTSC system. According to the present invention, an image having an aspect ratio of 9:16 is thinned out, reduced and displayed in the central portion of the display panel, and the periphery thereof is masked, so that the image is displayed without distortion and in an easily viewable state. You can According to the invention, 9:16
It is possible to display an image with a distorted and easy-to-see state when displaying a character on the 9:16 image by thinning out and reducing the image having the aspect ratio of 3 to display it in the center of the display panel. it can.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a driving method for a display device and a display panel according to the present invention will be described with a liquid crystal television as an example.

(First Embodiment) FIG. 1 shows a configuration of a liquid crystal television 11 according to a first embodiment of the present invention. In FIG. 1, the television signal is the antenna 12
Received by. The tuner 13 tunes the target signal (signal of the reception frequency) into an IF (intermediate frequency) signal according to a control signal VT from a controller 16 described later, and supplies the IF signal to the IF circuit 14.

The IF circuit 14 is an IF from the tuner 13.
The Y / C signal, the audio signal, and the composite sync signal CSY are separated from the signal.

The chroma circuit 15 converts the Y / C signal supplied from the IF circuit 14 into a luminance signal of each color of RGB and outputs it. Further, the chroma or color 15 is an R for displaying black in accordance with the black display instruction signal BK from the controller 16.
It outputs a GB brightness signal.

The controller 16 supplies the tuner 13 with a tuning control signal VT for adjusting the tuning frequency of the tuner 13 in accordance with the channel signal supplied from the switch section 21.

The controller 16 also includes an IF circuit 14
According to the composite synchronization signal CSY supplied from the switch unit 21 and the mode signal supplied from the switch unit 21, the chroma circuit 15, the scan electrode driving circuit 17, and the signal electrode driving circuit 1
8 to supply a control signal.

The control signal supplied to the chroma circuit 15 is
A black display instruction signal BK for instructing to output the RGB luminance signal for instructing black is included.

The control signals supplied to the scan electrode drive circuit 17 include a scan side start signal GSRT, a gate pulse clock signal GPCK, and a gate reset signal GRES.

The control signals supplied to the signal electrode drive circuit 18 include a polarity inversion signal FRP, a signal side start signal and a data shift clock signal.

The TFT type liquid crystal display panel (liquid crystal display element) 19 has 234 scanning electrodes (address electrodes) X1.
To X234 and 280 signal electrodes (data electrodes) Y1
˜Y280, a TFT (not shown) arranged at each intersection of the scanning electrode and the signal electrode, and a liquid crystal capacitance (pixel capacitance) CLC connected to the TFT.

The drive voltage generation circuit 20 supplies the voltage applied to the scan electrodes X1 to X234 of the liquid crystal display panel 19 to the scan electrode drive circuit 17, and the plurality of gradation voltages applied to the signal electrodes Y1 to Y280. It is supplied to the drive circuit 18.

The scan electrode drive circuit 17 is the controller 1
In accordance with the control signal from 6, the voltage supplied from the drive voltage generation circuit 20 is sequentially supplied to the scan electrodes X1 to X234 of the liquid crystal display panel 19 as a gate pulse.

The signal electrode drive circuit 18 is the controller 1
The RGB luminance signal supplied from the chroma circuit 15 is sequentially sampled according to the control signal from the control circuit 6, and the grayscale signal corresponding to the sampled signal is output in parallel to the signal electrodes Y1 to Y280 during the next horizontal scanning period. .

The signal electrode drive circuit 18 includes signal electrodes Y1 to Y.
The polarity of the signal output in parallel to 280 is inverted for each horizontal scanning line (scanning line) and each field according to the polarity inversion signal FRP in order to prevent deterioration of the liquid crystal.

FIG. 2 shows a screen configuration when a wide display is performed on the liquid crystal display panel 19, and black is displayed on each of the upper and lower 30 scanning lines in order to display an image having an aspect ratio of 9:16. Images are displayed on the 174 central lines. This image shows the second of 262 scanning lines per field.
One out of four out of 232 scanning lines from the sixth to the 257th scanning line is thinned out.

Then, a black band (mask) is displayed on the upper and lower 30 scanning lines. However, the non-display period of the television signal is approximately 30 horizontal scanning periods, and black cannot be displayed on the 60 scanning lines of the non-display period in a simple driving direction.
Therefore, in this embodiment, only the black band is simultaneously written to a plurality of scanning lines.

Further, as the scan electrode drive circuit 17, 24
It is assumed that the output terminal for 0 output is used, and as shown in FIG. 2, first to third and 23rd to 240th output terminals O1 to O
3 and 0238 to O240 are not connected (open), and the fourth to 237th output terminals O4 to O237 are connected to the scan electrodes X1 to X237.

The scan electrode drive circuit 17 has a shift register and a driver circuit for outputting a predetermined voltage supplied from the drive voltage generation circuit 20 in accordance with an output signal of the shift register. This shift register, as shown in FIG.
The scanning-side start signal GSRT is taken in at the falling edge of the gate pulse clock signal GPCK, shifted at the rising edge of the gate pulse clock signal GPCK, and output during the high level period of the gate reset signal GRES. Therefore,
For example, output terminals O1 to O4 of the scan electrode drive circuit 17
Output is as shown in FIG.

Next, the operation of the liquid crystal television 11 having the above structure will be described with reference to FIGS. 4 shows mainly odd-field signals, FIG. 5 mainly shows even-field signals, and FIG. 6 shows the period TA portion of FIG. 4 expanded on the time axis. CSY is a composite sync signal, BK is a black display instruction signal, FRP is a polarity inversion signal instructing to invert the polarity of the voltage applied to the liquid crystal in field units and scanning line units, GRST is a scan side start signal, and GPCK is Indicates a gate pulse clock signal for shifting the scan side start signal, and GRES indicates a gate reset signal.

When receiving a normal NTSC television signal, the user operates the switch section 21 to set the reception mode to the normal mode and specify the reception channel. The tuner 13 tunes the indicated channel, and the controller 16 uses the commonly known NTSC
The scan electrode drive circuit 17 and the signal electrode drive circuit 18 are controlled at the timing for the liquid crystal television of the system. Further, the black display instruction signal BK is not output.

On the other hand, when receiving a video in a mode called panorama or wide, the user has to switch
1 is operated to set the reception mode to the wide mode and to specify the reception channel.

The controller 16 controls the tuning signal V
Adjust the tuning frequency with T. The tuned signal is supplied to the IF circuit 14, where the audio signal, Y /
It is separated into the C signal and the composite sync signal CSY shown in FIGS.

The controller 16 operates in accordance with the composite video signal CSY, as shown in FIGS. 4B and 5B, from the 257th horizontal scanning period of the even field to the 25th horizontal scanning period of the odd field and the 25th horizontal scanning period of the odd field. The black display instruction signal BK is output from the 258 horizontal scanning period to the 25th horizontal scanning period of the even field to set the display color to black.

Further, the controller 16 operates in accordance with the composite video signal CSY, as shown in FIGS. 4 (D) and 6 (C).
As shown in, the scanning side start signal GSRT is output during the 255th horizontal scanning period of the even field, and further the gate pulse clock signal GPCK is output. Further, the polarity inversion signal FRP is output to the signal electrode drive circuit 18.

The scan electrode drive circuit 17 sequentially outputs the gate pulse while shifting it according to the gate pulse clock signal GPCK, as shown in FIG. 4 (F).

First output terminal O1 of scan electrode drive circuit 17
Since the output terminal O1 is not connected, the gate pulse output to the circuit does not affect the circuit operation. Further, at this timing, the scan electrode drive circuit 17 is operated in the odd field immediately before.
The scan side start signal GSRT fetched by the
It is output to the output terminal O206.

Therefore, a gate pulse is applied to the scan electrode X203 connected to the output terminal O206, and the video signal of the 255th horizontal scan period sampled by the signal electrode drive circuit 18 in the immediately previous horizontal scan period is written. FIG.
As shown in (B), the black display instruction signal BK is at a high level in the 257th horizontal scanning period. Therefore, the 205th
Written to scan line.

Then, the scan electrode X is connected from the fourth output terminal O4.
1, a gate pulse is applied to the scan electrode X20.
A gate pulse is also applied to 6. Therefore, the black video signal is written to the first scan line and the 206th scan line.

Subsequently, a gate pulse is output to the scan electrodes X2 and X207, and a black video signal is written to the second scan line and the 207th scan line.

Thus, as shown in FIG. 2, black is simultaneously written in the upper and lower black bands.

When the processing advances and the 25th horizontal scanning period ends, the controller 16 sets the black display instruction signal BK to the low level, and the chroma circuit 15 sets the RG corresponding to the Y / C signal.
The B luminance signal is output.

Then, when a gate pulse is output to the 33rd output terminal O33 and the 238th output terminal O238 of the signal electrode drive circuit 18, since the scan electrode is not connected to the 238th output terminal O238, the 33rd output is output. A gate pulse is applied to the 30th scan electrode X30 connected to the terminal O33 to write black on the 30th scan line.

When the writing to the 30th scanning line is completed,
Since the controller 16 thins out the video signals for one scanning line for every four scanning lines and sequentially writes them, the polarity inversion signal FRP and the gate pulse clock signal GPCK are intermittently output as shown in FIG. That is, the scan electrode driving circuit 17 is controlled so that the gate pulse is not output in the second horizontal scanning period of each of the four horizontal scanning periods.

Therefore, the video signal in the 26th horizontal scanning period is written in the 31st scanning line, the video signal in the 27th horizontal scanning period is thinned, and the video signal in the 28th horizontal scanning period is written in the 32nd scanning line. The video signal written and the video signal in the 29th horizontal scanning period is written in the 33rd scanning line. After that, the same operation is sequentially repeated.

When the scanning advances and the 255th horizontal scanning period of the odd field is reached, the controller 16 outputs the scanning side start signal GSRT as shown in FIG. 5 (D).
However, the first to third output terminals O of the scan electrode driving circuit 17
Since 1 to O3 are in the open state, the video signal in the 256th horizontal scanning period is written only in the 203rd scanning line, and the video signal in the 257th horizontal scanning period is written only in the 204th scanning line. This completes the writing of the odd-numbered field television image.

Subsequently, the black display instruction signal BK becomes high level during the 258th horizontal scanning period, and the video signal during the 258th horizontal scanning period becomes a signal for displaying black. This signal is written to the 205th scan line.

Then, a gate pulse is applied to the scan electrodes X1 and X206, and black is written in the first scan line and the 205th scan line.

Thereafter, similarly, the second scanning line and the 207th scanning line
Black is sequentially written to the scan line, the third scan line, the 208th scan line, ....

When black is written to the 29th and 233rd scanning lines, writing of the lower black band is completed, and subsequently, black is written to the 30th scanning line and writing of the upper black band. Ends.

After that, the video signal is written to each scanning line while the video signals of the fourth horizontal scanning period among the video signals of the four horizontal scanning periods are sequentially thinned. When the video signal in the 256th horizontal scanning period is written to the 204th scan line, the writing of the video signal is finished and the writing of the lower black band is started. Further, as described above, the scanning side start signal GSRT is output and the writing of the upper black band of the odd field is also started.

As described above, according to this embodiment, in the odd field, the 26th horizontal scanning period to the 2nd horizontal scanning period.
The video signals of 57 horizontal scanning periods are displayed while thinning out the signals of 1 horizontal scanning period in 4 horizontal scanning periods. In the even field, the video signals of 26th horizontal scanning period to 256th horizontal scanning period are displayed in 4 horizontal scanning periods. The display is performed while thinning out the signal for one horizontal scanning period. Therefore, an image with an aspect ratio of 9:16 can be displayed without distortion.

Further, since the black areas are written substantially above and below the image area substantially at the same time to provide the mask areas, the visual recognizability is improved.

In the above first embodiment,
Output terminals O1 to O3 and O238 of the scan electrode drive circuit 17
Since ~ 0240 is in the open state, the above timing is adopted. However, for example, 6 on the start side
It is also possible to set the one output terminal O1 to O6 to the open state. In this case, the scan side start signal GSRT
May be output earlier than the embodiment by 3 horizontal scanning periods. In addition, the six output terminals O235 to O2 on the end side
It is also possible to set 40 to the open state. In this case, the scanning-side start signal GSRT is output later than that in the embodiment by 3 horizontal scanning periods.

If the number of output terminals of the scan electrode driving circuit 17 is 240 and the number of opens on the start side and the end side is 6, another connection may be adopted.

(Second Embodiment) In the first embodiment, the writing of the upper black band and the writing of the lower black band are performed at substantially the same timing. A writing method may be adopted.

For example, two continuous scanning lines may be simultaneously selected to write black.

A method of driving the liquid crystal display panel 19 in this case will be described with reference to FIGS. The reference numerals and reference numbers are the same as those in FIGS. 4 to 6.

In the second embodiment, the controller 16 controls the scanning side start signal GSR during the tenth horizontal scanning period of the odd and even fields as shown in FIGS.
Transferred according to T, the gate reset signal GRES appears at the corresponding output terminal during the high level period.

As shown in FIGS. 7D and 8D, the gate pulse clock signal GPCK is applied to the even field from the 259th horizontal scanning period to the odd field to the 27th horizontal scanning period and the odd field. In the 260th horizontal scanning period to the 27th horizontal scanning period of the even field, 2 pulses are continuously output in each horizontal scanning period, and 1 pulse is output in the other periods.

FIG. 9 shows a waveform diagram in which the period TB portion of FIG. 7 is expanded on the time axis.

Therefore, as shown in FIG. 10, the first output terminal O1 is at the active level during the tenth horizontal scanning period, and the second and third output terminals O2 and O3 are active during the eleventh horizontal scanning period. And the fourth and fifth output terminals O4 and O5 are at the active level during the twelfth horizontal scanning period.

Further, for the output terminal O34 and thereafter,
The gate pulse is output to the two output terminals at the same time, and the gate pulse is output to each output terminal every two horizontal scanning periods.

The gate pulse in the latter half is a signal for writing the original image.

Next, the operation of the liquid crystal television 11 of the second embodiment will be described. In the odd field, the controller 16 outputs the scan-side start signal GSRT during the tenth horizontal scanning period, as shown in FIG. As enlarged in FIG. 9, in this period, the gate pulse clock signal GPCK has two pulses, and when the gate reset signal GRES becomes high level, the scan electrode driving circuit 1
The first output terminal O1 of 7 becomes high level. But,
Since this pin is open, it does not affect the circuit operation.

In the next eleventh horizontal scanning period, the output terminal O
2, O3 becomes high level. However, this terminal is also in the open state and does not affect the circuit operation.

In the next twelfth horizontal scanning period, the output terminal O
4 and O5 become high level, and the gate pulse is simultaneously applied to the scan electrodes X1 and X2. At this point, the 11th
A video signal in the horizontal scanning period, that is, a video signal for displaying black is sampled by the signal electrode drive circuit 18 and applied to the signal electrodes Y1 to Y280. Therefore, black is written in the first and second scanning lines of the liquid crystal display panel 19.

Thereafter, similarly, the third and fourth scanning lines,
Black is sequentially written to the fifth and sixth scanning lines.

In the 26th horizontal scanning period, the output terminal O3
2, O33 becomes high level, and scan electrodes X29, X3
At the same time, a gate pulse is applied to 0, a video signal for displaying black is applied to the signal electrodes Y1 to Y280, and the writing to the upper black band is completed.

In the 27th horizontal scanning period, the output terminal O3
4, O35 becomes high level, and scan electrodes X31, X3
2 is simultaneously applied with a gate pulse, and a video signal is applied to the signal electrodes Y1 to Y280.
The display image is written in the two scanning lines.

In the 28th horizontal scanning period, the gate reset signal GRES becomes low level, the output of the gate pulse clock signal GPCK is stopped, and the scan electrode driving circuit 1
The output of the signal from 7 is also stopped. Therefore, the video signal in the 27th horizontal scanning period is not written in the scanning line but is thinned out.

In the 29th horizontal scanning period, the output terminal O3
5, O36 becomes high level, and scan electrodes X32, X3
3 is simultaneously applied with a gate pulse and a video signal is applied to the signal electrodes Y1 to Y280.
The display image is written in the three scanning lines. In this way,
Each scanning line is selected twice, the image data is once written in the first selection, and then the image required for display is written in the second selection.

As shown in FIG. 8, in the 258th horizontal scanning period, the output terminal O207 becomes high level, the gate pulse is applied to the scanning electrode X204, and the video signal in the 257th horizontal scanning period is changed to the signal electrodes Y1 to Y280. And the writing of the display image is completed.

After that, two scanning lines are selected, and black is sequentially written in each scanning line until the tenth horizontal scanning period of the even field. When black is sequentially written to the 233rd and 234th horizontal scanning lines in the tenth horizontal scanning period of the even-numbered field, the writing of the lower black band is completed.

At the same time, as shown in FIG. 8C, the controller 16 outputs the scanning side start signal GSRT. After that, black is written in the 1st to 30th scanning lines in units of two continuous horizontal scanning lines, as in the odd field. After that, the video signals in the 26th to 256th horizontal scanning periods are written and displayed in the 31st to 204th scanning lines while being subtracted for one horizontal scanning period every four horizontal scanning periods.

Then, black is written in the 205th to 234th scanning lines, and the lower black band is written.

In this way, according to the second embodiment as well, an image with an aspect ratio of 9:16 is displayed in the center of a 3: 4 size screen without distortion, and the top and bottom of the image are masked with black. be able to.

(Third Embodiment) In the first embodiment, the upper black band and the lower black band are written at substantially the same timing, and in the second embodiment, they are continuously written. Although black is written in two horizontal scanning lines, for example, the upper black band and the lower black band may be written at substantially the same timing, and black may be written in two continuous horizontal scanning lines.

A driving method in this case will be described with reference to FIGS. 11 and 12. The meanings of the reference numerals and the numbers are the same as those in FIGS. The signal waveform in the period TC in FIG. 11 is the same as that in FIG.

In the third embodiment, FIG. 11 and FIG.
As shown in 2, the scanning side start signal GSRT is output during the tenth horizontal scanning period of the odd and even fields. The scan-side start signal GSRT is transferred in the scan electrode drive circuit 17 according to the gate pulse clock signal GPCK,
While the gate reset signal GRES is at the high level, it appears at the corresponding output terminal.

As shown in FIGS. 11 and 12, the gate pulse clock signal GPCK continuously outputs 2 pulses in each horizontal scanning period in the 10th to 27th horizontal scanning periods of each field. Second of odd field
In the 8th horizontal scanning period to the 260th horizontal scanning period and the 28th horizontal scanning period to the 259th horizontal scanning period of the even field, 3 pulses are output in the 4th horizontal scanning period, and the 261st horizontal scanning period of the odd field to the even number field is output. It is paused during the ninth horizontal scanning period of the field and the 260th horizontal scanning period of the even field to the ninth horizontal scanning period of the odd field.

According to this structure, for example, in the twelfth horizontal scanning period of the even field, the fourth and fifth output terminals O4 and O5 are at the high level, and the gate pulse is applied to the scanning electrodes X1 and X2 at the same time. A video signal for displaying black is applied to the signal electrodes Y1 to Y280. Therefore, black is written in the first and second scanning lines of the liquid crystal display panel 19. At the same time, the scanning-side start signal GSRT of the previous field causes the output terminal O215 of the 215th and the output terminal O216 of the 216th to be at a high level, and a gate pulse is applied to the scanning electrodes X212 and X213 at the same time.

That is, the writing of the black band is performed simultaneously on the upper two scanning lines and the lower two scanning lines. On the other hand, writing of the video signal is performed by thinning out one horizontal scanning period out of four horizontal scanning periods, as in the first and second embodiments.

According to the third embodiment, 4 at a time.
Since black is written on the scanning lines of the book, there is a margin in writing time. Therefore, in the margin time, the gate reset signal GRES and the gate pulse clock signal GPCK are both set to the low level to temporarily stop the shift of the gate pulse.

According to this structure, the power supply voltage VD is stabilized by the field inversion signal FRP even if the power supply voltage VD is switched immediately after the field is switched and the power supply voltage becomes unstable. After that, black can be written and uneven display can be prevented.

(Fourth Embodiment) In the first embodiment, the upper black band and the lower black band are written at substantially the same timing, and in the second embodiment, they are continuously written. Black is written on two horizontal scanning lines. In the third embodiment, writing of the upper black band and the lower black band is performed at substantially the same timing, and black is written on two continuous horizontal scanning lines. However, for example, the upper black band and the lower black band may be written at the same timing, and black may be written to a plurality of horizontal scanning lines that are not adjacent to each other.

A driving method in this case will be described with reference to FIGS. 13 and 14. The meanings of the reference numerals and the numbers are the same as those in FIGS.

In the fourth embodiment, FIG. 13 and FIG.
As shown in 4, the scanning side start signal GSRT is output during the tenth horizontal scanning period of the odd and even fields. The scan-side start signal GSRT is transferred in the scan electrode drive circuit 17 according to the gate pulse clock signal GPCK,
While the gate reset signal GRES is at the high level, it appears at the corresponding output terminal.

As shown in FIGS. 13 and 14, the gate pulse clock signal GPCK continuously outputs three pulses in each horizontal scanning period in the 10th to 25th horizontal scanning periods of each field. After that, it is output in a pattern in which two pulses are skipped and one pulse is output. In the 26th horizontal scanning period to the 257th horizontal scanning period of the odd field and the 26th horizontal scanning period to the 256th horizontal scanning period of the even field, 4 pulses are output at a rate of 3 pulses in the horizontal scanning period, and in the 258th horizontal scanning period of the odd field to the 9th horizontal scanning period of the even field and the 257th horizontal scanning period of the even field to the 9th horizontal scanning period of the odd field. , Paused.

According to this structure, for example, in the tenth horizontal scanning period of the odd number field, the fourth and sixth output terminals O4 and O6 become high level, and the gate pulse is applied to the scanning electrodes X1 and X3 at the same time. A video signal for displaying black is applied to the signal electrodes Y1 to Y280. Therefore, black is written in the first and third scanning lines of the liquid crystal display panel 19. At the same time, the scanning side start signal GSRT of the previous field causes the 217th output terminal O217 and the 219th output terminal O219 to go to a high level, and a gate pulse is applied to the scanning electrodes X214 and X216 at the same time.

Then, in the next eleventh horizontal scanning period, the seventh and ninth output terminals O7 and O9 are at a high level, the gate pulse is applied to the scanning electrodes X4 and X6 at the same time, and a video signal for displaying black is displayed. Is applied to the signal electrodes Y1 to Y280. Therefore, the fourth and sixth liquid crystal display panels 19 are
Black is written on the scan line. At the same time, the 220th output terminal O220 and the 222nd output terminal O222 become high level by the scanning side start signal GSRT of the previous field, and the gate pulse is simultaneously applied to the scanning electrodes X217 and X219.

That is, when writing the black band, the upper two scanning lines and the lower two scanning lines are simultaneously scanned for four scanning lines, and the gate pulse clock signal GPCK is output for three pulses and the two pulses are skipped. As a result, the next scanning line is placed so that the scanning lines for writing black at the same time are not adjacent to each other.

The black in the 25th horizontal scanning period is the 33rd
The video signal is written after writing to the scanning electrode X30 at the timing when the output terminal O33 of the above becomes high level. The writing of the video signal is performed for four horizontal scanning periods as in the first and second embodiments. One horizontal scanning period is thinned out.

In this video writing, after the video signal in the 257th horizontal scanning period is written in the scan electrode X204 at the timing when the 207th output terminal O207 becomes high level, the black in the 258th horizontal scanning period is the 208th and the 208th horizontal scanning period. 21
Data is simultaneously written to the scan electrodes X205 and X207 at the timing when the output terminals O208 and O210 of 0 become high level.

Subsequently, black in the 259th horizontal scanning period is the second
09 and 211th output terminals O209 and O211 are simultaneously written to the scan electrodes X206 and X208 at the timing when they become high level, and then the gate pulse clock signal GP
By stopping the CK and setting its output to the low level, even if the power supply voltage VD is switched immediately after the field switching due to the field inversion signal FRP and the power supply voltage becomes unstable, Black can be written after the voltage VD is stabilized, and display unevenness can be prevented.

Subsequently, the video signal and the black band are written by the same operation for the even field of FIG.

According to the fourth embodiment, 4 at a time.
Since black is written on the scanning lines of the book, there is a margin in writing time. Therefore, in the margin time, the gate reset signal GRES and the gate pulse clock signal GPCK are both set to the low level to temporarily stop the shift of the gate pulse.

Also, in the case of simultaneous shifting of two scanning lines, by opening one scanning line interval instead of adjacent scanning lines, the line inversion operation also operates smoothly, the power supply voltage VD switches, and the power supply voltage becomes unstable. Even in such a case, black can be written after the power supply voltage VD is stabilized, and uneven display can be prevented.

In the fourth embodiment, the 2-line simultaneous shift is controlled so as to open one scanning line. However, even in the case of 3-line simultaneous shift, the ON timing of the gate pulse clock signal GPCK is slightly different. It can be handled by changing it.

(Fifth Embodiment) In the first to fourth embodiments, since an image having an aspect ratio of 9:16 is displayed in the center of a 3: 4 size screen of the liquid crystal display panel 19, The image signals of one horizontal scanning period are displayed while being thinned out in four horizontal scanning periods. Therefore, when a character is superimposed and displayed on this video screen, if the character itself is thinned out at a rate of 1/4, the character originally has data of several tens of lines, which may be difficult to see. . In such a case, a character corresponding to a video with an aspect ratio of 9:16 may be generated and displayed.

In the fifth embodiment, an example of a liquid crystal television for generating and displaying a character corresponding to a 9:16 image will be described with reference to FIG.

In the liquid crystal television 40 shown in FIG. 15, the TFT video signal processing circuit 41 receives the composite video signal and generates a polarity inversion RGB signal in accordance with the polarity inversion signal FRP input from the LCD controller 42. The LCD controller 4 outputs the composite sync signal which is output to the TFT module 44 and separated from the composite video signal.
Output to 2.

In addition, the TFT video signal processing circuit 41
Includes an RGB signal inputting unit for character display, and RGB for character display input from the character generating unit 43.
Signals are input from the LCD controller 42 horizontally /
The character is displayed at the designated position of the TFT module 44 in synchronization with the vertical synchronizing signal.

Furthermore, the TFT video signal processing circuit 41
Then, the RGB signal for character display input from the character generation unit 43 is used for black band display above and below the display screen of the TFT module 44 by the wide display signal input from the LCD controller 42.

The LCD controller 42 operates in accordance with the composite sync signal supplied from the TFT video signal processing circuit 41 and the normal / wide display mode switching signal input from an external display mode switching switch (not shown). The polarity inversion signal FRP and the horizontal synchronization signal are supplied to 41, the field discrimination signal, the vertical synchronization signal, and the horizontal synchronization signal are supplied to the character generator 43, and TF
A drive control signal is supplied to the T module 44.

The character generation section 43 is composed of, for example, a dedicated on-screen display IC, and the I
C is a PLL circuit that generates a master clock from horizontal / vertical synchronization signals input from the LCD controller 42;
It is composed of a controller operating with this master clock, a video RAM, a character generator ROM, and the like. The character generator 43 generates a character display RGB signal for aspect ratio 3: 4 or an aspect ratio 9:16 according to the input normal / wide display mode switching signal, field discrimination signal and horizontal / vertical sync signal. Wide display character display RG
The B signal is generated and supplied to the TFT video signal processing circuit 41 via the OR circuit 45.

The TFT module 44 is composed of a TFT type liquid crystal display panel having a screen with an aspect ratio of 3: 4, and has a drive control signal input from the LCD controller 42 and a polarity input from the TFT video signal processing circuit 41. Inverted RGB signals display a video signal with an aspect ratio of 3: 4 on the entire screen on a screen with an aspect ratio of 3: 4, and a video signal with an aspect ratio of 9:16, for example, black on the upper and lower 30 scanning lines. Display and display the image in the center.

Next, the operation of the liquid crystal television 40 having the above-described structure in the wide display mode will be described with reference to the timing charts shown in FIGS.

FIG. 16 shows a timing chart of the first field, and FIG. 17 shows a timing chart of the second field. In each of these figures, (A) is a composite synchronizing signal,
(B) shows a field discrimination signal and (C) shows a character display signal.

In the liquid crystal television 40 having the above structure, a wide image having an aspect ratio of 9:16 is displayed in the center of a screen having an aspect ratio of 3: 4 size of the liquid crystal display module 44, so that one horizontal period is set in four horizontal scanning periods. The video signals in the scanning period are displayed while being thinned out. The positions at which the video signals of one horizontal scanning period are thinned out in these four horizontal scanning periods are indicated by a cross mark of the composite synchronizing signal in FIGS. 16 and 17.
The thinning positions are changed between the first field and the second field.

Further, in FIGS. 16 and 17, as the character display signal, the data of the character determined for each horizontal scanning period is simplified and shown as “Irohanihohe”.

In the normal display mode, the character display data is displayed in the 25th horizontal scanning period to the 30th horizontal scanning period in both the first and second fields as shown in FIGS.

In the wide display mode, the character display data is displayed in the first field shown in FIG.
16 and 17 so as not to be decimated in the decimated 28th horizontal scanning period and to be decimated in the 26th and 30th horizontal scanning periods in the second field shown in FIG. It is output at each timing.

That is, in the liquid crystal television 40 of FIG. 15, the character generation section 43 compares the character display data generated in the normal display mode with the first field character data and the second field character data in the wide display mode.
The field character data is prepared in advance in the character generator ROM, and in accordance with the normal / wide display mode switching signal input from an external display mode switching switch (not shown) and the field discrimination signal input from the LCD controller 42, the character data shown in FIG. Character data for the first field and character data for the second field are generated at the horizontal scanning timing excluding the thinning-out horizontal scanning period shown in the first field and the second field in FIG. 17, and the character data for the first field and the character data for the first field are generated. RGB for character display for the first field via the OR circuit 45 by character data for the second field
The signal and the RGB signal for character display for the second field are supplied to the TFT video signal processing circuit 41.

According to the fifth embodiment, in the wide display mode, the character generating section 43 generates character display data corresponding to the horizontal scanning timing for thinning out the video signal of one horizontal scanning period in four horizontal scanning periods. By supplying the RGB signal for character display based on the character display data to the video signal processing circuit 41 for TFT, even in wide display with an aspect ratio of 9:16, the same as in normal display with an aspect ratio of 3: 4. Character display can be realized, and the character display in wide display can be easily seen.

(Sixth Embodiment) Further, in the liquid crystal television 40 of the fifth embodiment, the character display data is generated for the wide display mode, but in the other wide display modes. As the character display method, for example, a method of setting a range in which the character is displayed in advance can be considered.

An example of setting the character display range will be described with reference to the timing chart shown in FIG. 18 for the operation of the liquid crystal television 40 having the above-described configuration in the wide display mode.

In FIG. 18, the mark X in the composite sync signal (A) indicates the thinning position of the 1/4 horizontal scanning period during wide display. Further, in FIG. 18, only the timing chart of the first field is shown, but in the second field, only the thinning-out position changes, and the execution content is the same as the timing chart of the first field.

In FIG. 18, the range in which the character is displayed is the gate line number. It shall be set to Y31 to Y42. In the case of the normal wide display mode,
As shown in FIG. 8, in the horizontal scanning period for displaying a wide image, the video signals of one horizontal scanning period are thinned out in four horizontal scanning periods to display a 9:16 wide image in the center of the 3: 4 screen. During the horizontal scanning period other than the video display period, the LCD
The controller 42 outputs the wide display signal SW shown in the figure as a high level to display black bands for each of the upper and lower 30 horizontal scanning periods of the image.

In the wide display mode of character display, as shown in FIG. 18, the gate line No. set in the character display range is set. The horizontal scanning period corresponding to Y31 to Y42 is not thinned out, and the display RGB signals are supplied from the character generation unit 43 to the TFT video signal processing circuit 41, so that the aspect ratio is 9:16 even in wide display. A character display similar to that in normal display with a ratio of 3: 4 is realized. However, the gate line No. set to this character display range. Gate line No. other than Y31 to Y42. In the horizontal scanning period corresponding to Y43 to Y204, the video signals of one horizontal scanning period are thinned out in four horizontal scanning periods to display a 9:16 wide image in the center of the 3: 4 screen. Then, during the horizontal scanning period other than the video display period, the LCD controller 42 outputs the wide display signal SW shown in the figure as a high level to display the upper and lower 30 horizontal scanning periods of the video image in black bands.

In the case of this character display method, in the normal wide display mode and the character display wide display mode,
In both cases, the upper and lower 30 horizontal scanning periods other than the video display portion are displayed in black. However, as shown in FIG. 18, the wide display signal output from the LCD controller 42 is displayed during normal wide display and character wide display. Since the SW period is different, the display start position for the input video signal is controlled to be different (gate line No. Y3
The horizontal scanning period number of the video signal displayed in 1 is different).

The switching between the normal wide display and the wide display during character display is performed by the character generation unit 43.
The character generation identification signal from the LCD controller 42
Automatically by switching the high level period of the wide display signal SW output from the LCD controller 42.

According to the sixth embodiment, the aspect ratio of 9: 1 is achieved by stopping the thinning out of the video signals during the character display wide display and displaying the character.
Even in the wide display of 6, it is possible to realize the same character display as in the normal display of the aspect ratio of 3: 4,
It is possible to make the character display in wide display easier to see.

In the first to sixth embodiments, the case where the broadcast radio wave is received and displayed has been described as an example. But,
The present invention is not limited to the first to sixth embodiments, and FIG.
As shown in FIG. 9, the same can be applied to the case where an image of 9:16 size obtained by the image pickup device 31 such as CCD is displayed on the monitor.

That is, in the configuration shown in FIG. 19, the output of the image pickup device 31 such as a CCD arranged in the video camera is processed by the read signal so that the input portion 32 outputs the image with an aspect ratio of 3: 4 or 9:16. It is possible to switch to either.

The RGB luminance signal output from the input section 32 is supplied to the signal electrode drive circuit 18 via the amplifier circuit 33.

The controller 16 controls the amplification factor of the amplification circuit 33 according to the mode of the supplied RGB luminance signal, and makes the amplification factor sufficiently small when displaying black, for example.

Further, the controller 16 controls the operation timings of the scan electrode drive circuit 17 and the signal electrode drive circuit 18 as in the first to fifth embodiments, so that the video signal of each mode can be appropriately supplied to the liquid crystal display panel. 19 is displayed.

The liquid crystal display panel 19 is composed of TFTs.
The type is not limited to the type, and may be an active matrix type using MIM or any passive matrix type color panel.

In the first to sixth embodiments, the liquid crystal display panel 19 having a screen having a size ratio of 3: 4 has 9:
Although the present invention has been described by taking the case of displaying an image having an aspect ratio of 16 as an example, the present invention is applicable to the case of displaying an image of an arbitrary size ratio on a liquid crystal panel having another arbitrary size ratio.
That is, a video signal having an aspect ratio of the display image of I: J is received, and the video signal is thinned out in units of scanning lines at a predetermined ratio, so that it is substantially centered on the screen of K: L size of the liquid crystal display panel. The present invention is widely applicable to the case of displaying with an aspect ratio of I: J, arranging regions for predetermined masks in the upper and lower parts of the central portion, and writing in the predetermined regions simultaneously with a plurality of scanning lines. Note that I, J, K, and L are positive real numbers.

The present invention is not limited to NTSC video signals, but PAL video signals (31 fields per field).
The present invention can also be applied to the 2.5 horizontal scanning period and the number of effective display signal lines 287.5). In case of normal PAL system video signal,
For example, a video signal for one scanning period is thinned out from a video signal for six horizontal scanning periods to form a video signal for five horizontal scanning periods,
In the case of a wide mode PAL video signal, display is performed as a video signal for two horizontal scanning periods by thinning out a video signal for one scanning period from a video signal for three horizontal scanning periods. Note that other decimation rates may be adopted.

Further, in the above-mentioned first to sixth embodiments, the present invention has been described by exemplifying the case of using the liquid crystal display panel (liquid crystal display element) as the display panel. It is similarly applicable to the type of display panel. That is, the present invention can be widely applied to a matrix type display panel having a plurality of scanning electrodes and a plurality of signal electrodes and writing an image while sequentially scanning the scanning electrodes.
The display panel may be an active matrix type or a passive matrix type. As this type of display element, for example, a plasma display panel (PDP), a field emission display panel (FED), an LED display panel, an electroluminescence (EL) display panel or the like can be used.

[0137]

As described above, according to the present invention, an image having an aspect ratio of 9:16 can be reproduced / displayed without distortion at the center of a display screen having a size of 3: 4.

Further, according to the present invention, the character displayed on the 9:16 image can be reproduced and displayed without distortion.

[Brief description of drawings]

FIG. 1 is a block diagram showing a structure of a liquid crystal television according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a connection relationship between a signal electrode drive circuit and a liquid crystal display panel.

FIG. 3 is a timing chart for explaining the operation of the first embodiment of the liquid crystal television shown in FIG.

FIG. 4 is a timing chart for explaining the operation of the liquid crystal television shown in FIG. 1 according to the first embodiment.

5 is a timing chart for explaining the operation of the first embodiment of the liquid crystal television shown in FIG.

FIG. 6 is a timing chart for explaining the operation of the liquid crystal television shown in FIG. 1 according to the first embodiment.

7 is a timing chart for explaining the operation of the second embodiment of the liquid crystal television shown in FIG.

8 is a timing chart for explaining the operation of the second embodiment of the liquid crystal television shown in FIG.

9 is a timing chart for explaining the operation of the second embodiment of the liquid crystal television shown in FIG.

10 is a timing chart for explaining the operation of the second embodiment of the liquid crystal television shown in FIG.

FIG. 11 is a timing chart for explaining the operation of the third embodiment of the liquid crystal television shown in FIG.

FIG. 12 is a timing chart for explaining the operation of the third embodiment of the liquid crystal television shown in FIG.

FIG. 13 is a timing chart for explaining the operation of the liquid crystal television shown in FIG. 1 according to the fourth embodiment.

FIG. 14 is a timing chart for explaining the operation of the fourth embodiment of the liquid crystal television shown in FIG.

FIG. 15 is a block diagram showing a structure of a liquid crystal television according to a fifth embodiment of the present invention.

16 is a timing chart for explaining the operation of the fifth embodiment of the liquid crystal television shown in FIG.

FIG. 17 is a timing chart for explaining the operation of the fifth embodiment of the liquid crystal television shown in FIG.

FIG. 18 is a timing chart for explaining the operation of the sixth embodiment of the liquid crystal television shown in FIG.

FIG. 19 is a block diagram showing an embodiment of a monitor device of the present invention.

[Explanation of symbols]

 11 Liquid crystal television 12 Antenna 13 Tuner 14 IF circuit 15 Chroma circuit 16 Controller 17 Scan electrode drive circuit 18 Signal electrode drive circuit 19 Liquid crystal display panel 20 Drive voltage generation circuit 21 Switch part 31 Imaging device 32 Input part 33 Amplification circuit 41 For TFT Video signal processing circuit 42 LCD controller 43 Character generation unit 44 TFT module 45 OR circuit

Claims (12)

[Claims] 1. A display panel having a screen having an aspect ratio of substantially 3: 4, a signal supplying means for supplying a video signal having a display image aspect ratio of 9:16, the display panel and the signal supplying means. A display for displaying a video signal supplied from the signal supply means in the center of the screen with an aspect ratio of substantially 9:16 and displaying regions of a predetermined color above and below the center. A display device comprising: a control unit. 2. The display control means comprises means for thinning out and displaying a signal for one horizontal scanning period every four horizontal scanning periods of the video signal and writing black on the remaining scanning lines. The display device according to claim 1. 3. The display device according to claim 1, wherein the display control means includes means for writing an upper predetermined color area and a lower predetermined color area substantially simultaneously. . 4. The display control means comprises means for writing a predetermined color to a plurality of adjacent scanning lines in the predetermined color region substantially at the same time. Display device. 5. The display control means comprises means for writing a predetermined color substantially simultaneously on a plurality of adjacent scanning lines in an upper predetermined color area and a lower predetermined color area. The display device according to claim 1 or 2. 6. The display control means comprises means for writing the predetermined color substantially simultaneously on a plurality of non-adjacent scanning lines in the upper predetermined color area and the lower predetermined color area. The display device according to claim 1 or 2. 7. A display panel having a screen having an aspect ratio of substantially 3: 4, a first video signal having an aspect ratio of a display image of 3: 4 and a second image signal having an aspect ratio of the display image of 9:16. Signal supply means for supplying the first video signal to the screen of the display panel according to a signal supplied from the signal supply means and connected to the display panel and the signal supply means. Is displayed substantially in front of the second video signal, the second video signal is displayed in the center of the screen with an aspect ratio of substantially 9:16, and regions of a predetermined color are displayed above and below the center. A display device comprising display control means. 8. A display panel, supply means for supplying a video signal having an aspect ratio of a display image of I: J, connected to the display panel and the supply means, and supplying the video signal according to the video signal. Thinning is performed in units of scanning lines at a predetermined ratio so that the screen is displayed in the center of the screen of the display panel with an aspect ratio of I: J, and a predetermined color is simultaneously applied to a plurality of scanning lines above and below the center. A display device, comprising: display control means for displaying a predetermined color on the upper part and the lower part of the central part by writing. 9. A display panel, a video supply means for supplying a video signal with an aspect ratio of the display image of I: J, and a character for supplying a character signal corresponding to the video signal with an aspect ratio of the display image of I: J. Supply means, connected to the display panel, the image supply means, and the character supply means, thinning out the video signal at a predetermined ratio in scanning line units according to the video signal, and centering the screen of the display panel. Part is displayed with an aspect ratio of I: J, and the character signal is displayed at a position where the scanning lines are not thinned according to the character signal, and a plurality of characters are displayed in the upper part and the lower part of the central part. A display device characterized by comprising display control means for displaying a predetermined color on the upper part and the lower part of the central part by simultaneously writing the predetermined color on the scanning lines. Place. 10. A display panel, a video supply means for supplying a video signal having an aspect ratio of the display image of I: J, and a character signal for setting a character display range to the video signal having an aspect ratio of the display image of I: J. Connected to the display panel, the video supply means, and the character supply means, the video signal is thinned out in scanning line units at a predetermined ratio in accordance with the video signal, and the display panel Is displayed substantially in the aspect ratio of I: J at the center of the screen, and in accordance with the character signal, the character is displayed in the character display range set by the character signal without thinning out the scanning lines. , A predetermined color is simultaneously written on a plurality of scanning lines above and below the central portion to display the predetermined color on the upper and lower portions of the central portion. And display control means for the display device, characterized in that it further configuration. 11. A video signal having an aspect ratio of a display image of 9:16 is received, and the video signal is thinned out in scan line units at a predetermined ratio in accordance with the video signal, and the video signal is displayed in the central portion of the screen of the display panel. The display is performed with an aspect ratio of substantially 9:16, regions of a predetermined color are displayed on the upper part and the lower part of the central part, and writing of the region of the predetermined color is simultaneously executed by a plurality of scanning lines. Driving method of display panel. 12. A K: L size display panel which receives a video signal having an aspect ratio of I: J of a display image, thins out the video signal at a predetermined ratio in units of scanning lines according to the video signal. Is displayed in the center part of the screen with an aspect ratio of I: J,
A method of driving a display panel, comprising: displaying an area of a predetermined color above and below the central portion, and writing the area of the predetermined color simultaneously with a plurality of scanning lines.