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JP2004364024

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2004364024
To provide left and right audio from left and right speakers, respectively, provided with three or
more speakers and capable of horizontal display and vertical display, and switching to setting of
horizontal display or vertical display by rotating by 90 degrees Providing display devices that
can A display device capable of displaying at rotational positions different by 90 degrees,
switching a video displayed by a display unit to horizontal display or vertical display, and
outputting left and right audio respectively. Switching means 25 for switching to output any of
left and right audio from the speakers a to d according to the positions of the three or more
speakers a to d and the speakers a to d arranged so as to surround the display unit 13 , 35, and
so on. [Selected figure] Figure 2
Display device
The present invention is capable of displaying at different rotational positions by 90 degrees, and
switches the video displayed by the display unit to landscape display or portrait display, and
outputs left and right audio respectively. The present invention relates to a display device. [0002]
Displays such as LCD (Liquid Crystal Display), PDP (Plasma Display Panel), CRT (Cathode Ray
Tube), ELD (ElectroLuminescent Display), etc. which are connected to a computer and display
video signals from the computer. The device is lightweight and can be set in a relatively flexible
manner, so it has both a landscape view (horizontal view) long and a portrait view (long view)
long at a different rotational position by 90 degrees. There is something that can be done. In this
case, since the scanning direction of the display device changes by 90 degrees, the scanning
direction at the time of displaying the video signal is also converted by 90 degrees (vertical /
horizontal conversion) without changing the vertical and horizontal relationship of the video.
[Patent Document 1] Japanese Patent Application Laid-Open No. 10-240140 Patent Document 2
Japanese Patent Application Laid-Open No. 07-030834 [Patent Document 3] Japanese Patent
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Application Laid-Open No. 2002-078073 [Patent Document 4] Japanese Patent Application LaidOpen No. 05-073011 [0004] In the display device capable of conventional landscape display and
portrait display, for example, as shown in FIG. 3 (a), landscape display is performed and the
display device is disposed at four corners. When the setting is switched to portrait display by
rotating 90 degrees from the setting that outputs left and right voices by speakers a, b, c, d, the
left and right voices are respectively positioned at speakers a, b, c, d There is a problem that it
will be output from. As a technique related to such a problem, in claim 1 of Patent Document 1,
the screen center of the display surface in the vertically long screen state is different from the
screen center of the display surface in the horizontally long screen state. In the thin display
device, the center of rotation of the display unit is set, and speakers are disposed at the three
corners of the front of the display. In Patent Document 2, a frame member mounted around the
flat display, a corner portion connector for connecting the frame members at four corners of the
flat display, and the corner portion connector are housed in the inside of the corner portion
connector. A flat display device is described which comprises a loudspeaker. In Patent Document
3, left and right speaker boxes are provided on left and right sides of the main body so as to be
rotatable in the front and rear direction, and when both of the left and right speaker boxes are
rotated backward by 90 ° or more, the left and right channels are interchanged. An all-in-one
audio set is described.
Patent Document 4 detects the vertically long state and the horizontally long state of the display
unit based on the resistance value of the variable resistor interlocked with the rotation of the
display unit, and displays the vertically long or horizontally long display screen according to the
detected state. An information processing apparatus to be displayed is described. The present
invention has been made in view of the above-described circumstances, and is provided with
three or more speakers, is capable of landscape display and portrait display, and is rotated 90
degrees for landscape display or portrait display. An object of the present invention is to provide
a display device capable of outputting left and right sounds from left and right speakers even
when switching to setting. The display device according to the first aspect of the present
invention can be displayed at different rotational positions by 90 degrees, and switches the
image displayed by the display unit to horizontal display or vertical display, The display device
outputs each of the three or more speakers arranged so as to surround the display unit, and
either the left or right sound is output from the speaker according to the position of the speaker.
And switching means for switching. In this display device, it is possible to display at rotational
positions different by 90 degrees, switch the video displayed by the display unit to horizontal
display or vertical display, and output left and right audio respectively. Three or more speakers
are arranged so as to surround the display unit, and the switching means switches so as to output
either the left or right sound from the speakers according to each position of the speakers.
Thereby, three or more speakers are provided, and horizontal display and vertical display are
possible. Even when the display is rotated by 90 degrees and switched to horizontal display or
vertical display setting, the left and right voices are respectively output from the left and right
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speakers. It is possible to realize a display device that can The display device according to the
second aspect of the present invention can display images at different rotational positions by 90
degrees, and the image displayed by the display unit according to the angle detected by the
means for detecting the rotation angle of the display unit. A display device which switches to
horizontal display or vertical display and outputs left and right voices, and interlocks with
switching of three or more speakers arranged to surround the screen and switching between the
horizontal display or the vertical display, And switching means for switching any one of the left
and right sounds from the speaker according to each position of the speaker. In this display
device, it is possible to display at different rotational positions by 90 degrees, and according to
the angle detected by the means for detecting the rotational angle of the display unit, the
horizontal display or the vertical display of the image displayed by the display Switch to and
output the left and right voices respectively.
Three or more speakers are arranged so as to surround the screen, and the switching means is
interlocked with the switching of the landscape display or the portrait display and outputs either
the left or right audio from the speakers according to the position of the speakers. Switch. As a
result, three or more speakers are provided, and horizontal display and vertical display can be
performed, and even when the display is rotated by 90 degrees and switched to horizontal
display or vertical display setting, the user does not need to operate the left and right. A display
device capable of outputting sound from the left and right speakers can be realized. The display
device according to the third invention is characterized in that the speakers are four speakers
respectively disposed at four corners of the screen. In this display device, since the speakers are
four speakers respectively disposed at the four corners of the screen, the speakers are provided
with four speakers, and can be displayed in landscape and portrait views, and they are rotated 90
degrees to be landscape Even when switching to the setting of display or portrait display, it is
possible to realize a display device capable of outputting left and right sounds from the left and
right speakers, respectively. The display device according to the fourth aspect of the present
invention further comprises a first reference table defining an output for each of the speakers to
be switched by the switching means in each of the horizontal display and the vertical display. (1)
It is characterized in that switching is performed based on a reference table. In this display
device, the switching means further includes a first reference table defining the output for each
speaker to be switched in each of the horizontal display and the vertical display, and the
switching means switches based on the first reference table. Even when 3 or more speakers are
provided, horizontal display and vertical display are possible, and the display is switched to
horizontal display or vertical display setting by rotating 90 degrees, the left and right voices can
be displayed without requiring user operation. A display device capable of outputting from left
and right speakers can be realized. A display device according to a fifth aspect of the invention is
characterized in that the switching means is configured to turn off the speaker when no other
speaker is present at a position symmetrical with the speaker. In this display device, the
switching means turns off the speaker when there is no other speaker at a symmetrical position
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with respect to the speaker, so that three or more including the ones disposed at other than the
four corners of the screen A display device that is capable of outputting left and right audio from
left and right speakers even when it is equipped with speakers and can be displayed in landscape
or portrait and rotated to 90 ° and switched to landscape or portrait display settings It can be
realized.
In the display device according to the sixth aspect of the present invention, the switching means
has a filter unit for combining the left and right voices and passing only the low-pitched portion
of the combined voice, and The speaker is characterized in that the speaker is switched to output
the bass part which has passed through the filter section when the speaker of the above is not
present. In this display device, when the filter unit synthesizes the left and right voices and
passes only the low-pitched portion of the synthesized voice, the switching unit passes only the
low-pitched portion of the synthesized voice, and there is no other speaker at a symmetrical
position with the speakers. The speaker switches so as to output the bass part that has passed
through the filter unit. Thereby, three or more speakers including those disposed at other than
the four corners of the screen are provided, horizontal display and vertical display are possible,
and even when the display is rotated by 90 degrees and switched to horizontal display or vertical
display setting, It is possible to realize a display device capable of outputting left and right voices
from left and right speakers, respectively, and capable of reinforcing a bass portion which is
small in directivity of the left and right voice and which is small in a small speaker. A display
device according to a seventh aspect of the present invention is to provide a resolution detection
means for detecting the resolution of the video, an audio delay circuit for delaying the audio, and
delay for each resolution in each of the horizontal display and the vertical display. The audio
delay circuit further includes a second reference table defining the delay time of the audio, and
the audio delay circuit switches the horizontal display or the vertical display, the resolution
detected by the resolution detection unit, and the second reference table. It is characterized in
that the speech is delayed. In this display device, the resolution detection means detects the
resolution of the video, and the second reference table defines the delay time of the audio to be
delayed for each resolution in each of the horizontal display and the vertical display. The audio
delay circuit delays the audio based on switching between horizontal display or vertical display,
the resolution detected by the resolution detection means, and the second reference table.
Thereby, three or more speakers are provided, and horizontal display and vertical display are
possible. Even when the display is rotated by 90 degrees and switched to horizontal display or
vertical display setting, the left and right voices are respectively output from the left and right
speakers. It is possible to realize a display device capable of eliminating the phenomenon that the
video lags behind the audio due to the processing time of the video signal. The display device
according to the eighth aspect of the present invention further comprises a terminal for
outputting the left and right voice signals to the outside, wherein the signal is taken out from the
front stage of the switching means and is not switched by the switching means. It is characterized
by
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The display device further includes a terminal for outputting the left and right audio signals to
the outside, and the left and right audio signals to be output to the outside are extracted from the
front stage of the switching means and are not switched by the switching means. Thereby, three
or more speakers are provided, and horizontal display and vertical display are possible. Even
when the display is rotated by 90 degrees and switched to horizontal display or vertical display
setting, the left and right voices are respectively output from the left and right speakers. Thus, it
is possible to realize a display device in which the sound of headphones and external speakers
not related to the switching between the landscape display and the portrait display does not
change. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the
present invention will be described based on the drawings showing it. Embodiment 1 FIG. 1 is a
block diagram showing a configuration of a first embodiment of a display device according to the
present invention. This display device is provided with a video size detection unit 11 (resolution
detection means) for detecting the size (resolution) of the input video signal, and a video signal
through the video size detection unit 11, and is given according to the setting. A verticalhorizontal conversion circuit 12 that converts the scanning direction when displaying a video
signal by 90 degrees (vertical-horizontal conversion) without changing the vertical or horizontal
relationship of the video, and an LCD 13 that displays the video signal output by the verticalhorizontal conversion circuit 12 (Liquid And a Crystal Display). The display device also displays a
landscape display (horizontal display) and a portrait display according to the display unit angle
detection unit 15 that detects the rotation angle of the LCD 13 and the rotation angle detected by
the display unit angle detection unit 15. The vertical / horizontal display setting unit 14 which
sets the signal to any of (vertical display) and gives the setting signal to the vertical / horizontal
conversion circuit 12 and the audio to be delayed for each resolution of the video signal in each
of landscape display and portrait display. Based on the delay time table 18 (second reference
table) defining the delay time, the resolution detected by the video size detection unit 11, the
setting signal from the vertical and horizontal display setting unit 14, and the delay time table
18, input left and right audio And an audio delay circuit 17 for delaying the signal and outputting
the delayed left and right audio signals. The delay time table 18 is an image as shown in FIG. 4
and is a time Ta, Tb, etc. for delaying the audio in the input video signals VGA, SVGA, XGA, SXGA
in the case of landscape display (horizontal display). Tc, Td, and times Te, Tf, Tg, Th for delaying
the audio in the input image VGA, SVGA, XGA, SXGA in the case of the portrait display are
written.
As the resolution (number of pixels) is larger and portrait display takes more time to process the
video signal, Ta <Tb <Tc <Td, Te <Tf <Tg <Th, Ta <Te, Tb < Tf, Tc <Tg, Td <Th. In the case of
landscape display, since the delay time is short, Ta to Td may be 0. This display device also
determines the sound to be output by the speakers a, b, c and d arranged at the four corners of
the LCD 13 in each of the horizontal display and the vertical display, respectively, as shown in
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FIG. From the audio delay circuit 17 based on the switching table 19 (first reference table) of the
image as shown in FIG. 1, the rotation angle detected by the display unit angle detection unit 15,
the setting signal from the vertical and horizontal display setting unit 14 and the switching table
19. An output switching circuit 16 for switching and outputting given left and right audio signals
to the speakers a, b, c, d, and an audio external output terminal for outputting the left and right
audio signals output from the audio delay circuit 17 to the outside It has 20 and. FIG. 2 is a block
diagram showing a configuration example of the output switching circuit 16. The output
switching circuit 16 includes an amplifier 21 for amplifying the input left audio, an amplifier 22
for amplifying the input right audio, and a headphone jack 23 for outputting the audio signal
output from each of the amplifiers 21 and 22 to the outside. When the headphone plug is
inserted into the headphone jack 23, the speakers a and b are switched by the contact 24 for
blocking the audio signal to the speakers a, b, c and d, and the switching signal from the
switching control unit 35 described later. , C, d, each of the switching unit 25 based on the
switching unit 25 for switching left and right audio signals, the rotation angle signal from the
display unit angle detection unit 15, the setting signal from the vertical and horizontal display
setting unit 14 and the switching table 19. And a switching control unit 35 that switches and
controls the contacts. The switching unit 25 is disposed at the upper left of the LCD 13 for
landscape display, and a contact 26 for connecting the speaker a and the amplifier 22 disposed
at the upper right of the LCD 13 for portrait display, the speaker a and the amplifier 21 and a
contact 28 disposed at the lower right of the LCD 13 for landscape display and a speaker 28
disposed at the lower left of the LCD 13 for portrait display and the speaker 21; And a contact 29
connecting the amplifier 22 and the amplifier 22. The speaker b disposed at the lower left of the
LCD 13 in the case of landscape display and disposed at the upper left of the LCD 13 in the
portrait display is connected to the amplifier 21 without passing through the contacts in the
switching unit 25.
The speaker c arranged at the upper right of the LCD 13 in the case of landscape display and
arranged at the lower right of the LCD 13 in the case of portrait display is connected to the
amplifier 22 without passing through the contacts in the switching unit 25. Hereinafter, an
example of the operation of the display device having such a configuration will be described. In
this display device, for example, when the user rotates the LCD 13 clockwise 90 degrees and
switches from landscape display to portrait display as shown in FIG. 3A, the display unit angle
detection unit 15 outputs the rotation angle Are detected, and the rotation angle signal is applied
to the vertical and horizontal display setting unit 14 and the output switching circuit 16. The
vertical / horizontal display setting unit 14 switches the setting of landscape display to the
setting of portrait display based on the supplied rotation angle signal, and sets the setting signal
of portrait display to the vertical / horizontal conversion circuit 12, the audio delay circuit 17
and the output switching circuit 15. Give to. The vertical / horizontal conversion circuit 12 is
supplied with a setting signal for portrait display, vertically / horizontally converts the video
signal into a video signal for portrait display, and outputs the video signal to the LCD 13. The
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audio delay circuit 17 reads the delay time in the case of portrait display of the resolution
detected by the video size detection unit 11 with reference to the delay time table 18, and delays
the input audio signal based on the read delay time. Let me output it. In the output switching
circuit 16, the switching control unit 35 refers to the switching table 19 based on the rotation
angle signal from the display unit angle detection unit 15 and the setting signal from the vertical
and horizontal display setting unit 14, and is based on the switching table 19. The switching
signal is supplied to the switching unit 25. The switching unit 25 turns on the contact 26
connecting the speaker a and the amplifier 22 (right sound) by the given switching signal, and
turns off the contact 27 connecting the speaker a and the amplifier 21 (left sound). . Further, the
contact 28 connecting the speaker d and the amplifier 21 (left audio) is turned on, and the
contact 29 connecting the speaker d and the amplifier 22 (right audio) is turned off. As a result,
from the state where the left audio is output from the speakers a and b and the right audio is
output from the speakers c and d in the landscape display, the left audio from the speakers b and
d in the portrait display is displayed. However, it switches to the state where the right audio |
voice is each output from the speakers a and c. As a result, the left and right audios are
respectively output from the left and right as before switching to the portrait display, and no
delay from the audio of the video occurs. However, the left and right of the audio signal from the
headphone jack 23 and the audio external output terminal 20, which are terminals for outputting
the left and right audio signals to the outside, are not switched.
In the first embodiment described above, the display unit angle detection unit 15 detects the
rotation angle of the LCD 13, automatically switches between landscape display and portrait
display, and automatically switches left and right audio output. Although it is configured as
described above, an OSD (On Screen Display) control unit is provided instead of the display unit
angle detection unit 15, and the user manually operates landscape display and portrait display by
operating on the screen of the LCD 13. The output switching of the left and right audio may be
interlocked with that, or the left and right audio output may be manually switched by the OSD
operation. Second Embodiment FIG. 5 (a) is an explanatory view showing an example of the
operation of the second embodiment of the display device according to the present invention. In
this display device, speakers e, f, g and h are arranged at the center of each side of LCD 13, and
in the case of landscape display and portrait display, speakers e, f, g and h respectively output
The switching table 19 (first reference table) (FIG. 1) defining the voices to be generated has an
image as shown in FIG. 5 (b). The other configuration example of this display device is the same
as the configuration (FIG. 1) of the display device of the first embodiment except the
configuration of the output switching circuit 16a described later, and therefore the description
other than the output switching circuit 16a is omitted. . FIG. 6 is a block diagram showing a
configuration example of the output switching circuit 16 a of the display device. The output
switching circuit 16a includes an amplifier 21 for amplifying the input left audio, an amplifier 22
for amplifying the input right audio, and a headphone jack 23 for outputting the audio signal
output from each of the amplifiers 21 and 22 to the outside. When a headphone plug is inserted
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into the headphone jack 23, a contact 24 for blocking audio signals to the speakers e, f, g, h is
provided. The output switching circuit 16a is also provided with the respective outputs of the
amplifiers 21 and 22 from the LCD 13 side of the contact 24, and after combining the given
outputs, the filter unit 30 passes only the bass portion and outputs it. (Low-pass filter; LPF) and a
switching unit 25 a that switches left and right audio signals to the speakers e, f, g, h by a
switching signal from the switching control unit 35 described later, and rotation from the display
unit angle detection unit 15 A switching control unit 35 switches and controls each contact of
the switching unit 25 a based on the angle signal, the setting signal from the vertical and
horizontal display setting unit 14, and the switching table 19. The switching unit 25 a is disposed
at the center of the left side of the LCD 13 for landscape display, and switches the speaker g
disposed at the center of the upper side of the LCD 13 to the amplifier 21 or the filter unit 30 for
portrait display. Switching contact 31 and a speaker f arranged at the center of the lower side of
the LCD 13 in landscape display, and a speaker f arranged at the center of the left side of the
LCD 13 in portrait display to the amplifier 21 or the filter unit 30 And a contact 32.
The switching unit 25 a is disposed at the center of the right side of the LCD 13 in landscape
display, and at the center of the lower side of the LCD 13 in portrait display, to the amplifier 22
or the filter unit 30. The switching contact 33 to be switched and connected, the speaker e
disposed at the center of the upper side of the LCD 13 in landscape display, and the speaker e
disposed at the center of the right side of the LCD 13 in portrait display is switched to the
amplifier 22 or the filter unit 30 And a switching contact 34. Hereinafter, the operation of the
display device having such a configuration will be described. In this display device, the output
switching circuit 16 a refers to the switching table 19 by the switching control unit 35 according
to the rotation angle signal from the display unit angle detection unit 15 and the setting signal
from the vertical and horizontal display setting unit 14. The switching unit 25a is supplied with a
switching signal based on The switching unit 25 switches the connection destination of the
speaker g from the amplifier 21 (left audio) to the filter unit 30 (bass portion) by the switching
contact 31 based on the given switching signal, and the speaker 32 by the switching contact 32
The connection destination of f is switched from the filter unit 30 (bass portion) to the amplifier
21 (left voice). Further, the connection point of the speaker h is switched from the amplifier 22
(right voice) to the filter unit 30 (bass portion) by the switching contact 33, and the connection
point of the speaker e is amplified from the filter unit 30 (bass portion) by the switching contact
34 Switch to 22 (right audio). As a result, from the state where the left sound from the speaker g,
the right sound from the speaker h, and the low frequency part from the speakers e and f are
output in the landscape display, the speaker f in the portrait display is obtained. From left to
right, from the speaker e, and from the speakers g and h to the low-pitched part. As a result, the
left and right voices are respectively output from the left and right as before switching to the
portrait display, and the bass portion of the voice is also reinforced and output. The other
operations are the same as the operations of the display device described in Embodiment 1, and
thus the description thereof is omitted. In the embodiment described above, instead of
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connecting the speakers e, f, g, h to the filter unit 30 by the switching contacts 31, 32, 33, 34,
the switching contacts 31, 32, 33, 34 are turned off. You may In each of the above-described
embodiments, the case where the display device includes four speakers has been described.
However, the present invention can be applied to the case where three speakers are provided.
For example, FIG. 7A shows a case where speakers q, r, and p are disposed at the upper right
corner, the lower right corner, and the lower left corner of the LCD 13 in the case of landscape
display, respectively. In each case of the landscape display and the portrait display, the switching
table in which the voices to be output by the speakers q, r and p are defined is an image as
shown in FIG. 7B. With such a display device, with the configuration similar to the first and
second embodiments, in the case of landscape display, the left sound is output from the speaker
p and the right sound is output from the speaker r, and the speaker q is off. From a certain state,
in the case of portrait display, the left sound is output from the speaker r and the right sound is
output from the speaker q, and the speaker p is switched to the off state. As a result, the left and
right voices are respectively output from the left and right as before switching to the portrait
display, and no voice unbalance occurs. FIG. 8A shows a case where speakers j, k, and m are
disposed at the upper left corner, the lower left corner, and the lower right corner of the LCD 13
in the case of landscape display, respectively. In each case of the landscape display and the
portrait display, the switching table in which the voices to be output by the speakers j, k and m
are defined is an image as shown in FIG. With such a display device, with the configuration
similar to the first and second embodiments, in the case of landscape display, the left sound is
output from the speaker k and the right sound is output from the speaker m, and the speaker j is
off. From a certain state, in the case of portrait display, the left sound is output from the speaker
k and the right sound is output from the speaker j, and the speaker m is switched to the off state.
As a result, the left and right voices are respectively output from the left and right as before
switching to the portrait display, and no voice unbalance occurs. According to the display device
of the first aspect of the present invention, the display device according to the first aspect of the
present invention has three or more speakers, and can display in landscape and portrait views,
and can be rotated 90 degrees to set landscape or portrait display. Even when switched, it is
possible to realize a display device capable of outputting left and right audio from the left and
right speakers, respectively. According to the display device of the second aspect of the present
invention, the display device according to the second aspect of the invention has three or more
speakers, and can display horizontally and vertically, even when it is rotated 90 degrees and
switched to horizontal display or vertical display. It is possible to realize a display device capable
of outputting left and right voices from left and right speakers, respectively, without requiring
user's operation.
According to the display device of the third aspect of the present invention, the display device
according to the third aspect of the present invention has four speakers, and can display
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horizontally and vertically, and even when it is rotated by 90 degrees and switched to horizontal
display or vertical display. Thus, it is possible to realize a display device capable of outputting the
sound of each from the left and right speakers. According to the display device of the fourth
aspect of the present invention, the display device according to the fourth aspect of the present
invention has three or more speakers, can be horizontally long display and vertical long display,
and rotates 90 degrees to switch to horizontal long display or vertical long display setting. It is
possible to realize a display device capable of outputting left and right voices from left and right
speakers, respectively, without requiring user's operation. According to the display device of the
fifth aspect of the present invention, the display device according to the fifth aspect of the
present invention is provided with three or more speakers including those disposed at other than
the four corners of the screen, and can display horizontally long and vertically long. Alternatively,
even when switching to the setting of the vertically long display, it is possible to realize a display
device capable of outputting the left and right sounds from the left and right speakers,
respectively. According to the display device of the sixth aspect of the present invention, the
display device according to the sixth aspect includes three or more speakers including those
disposed at other than the four corners of the screen, and can perform landscape display and
portrait display by rotating 90 degrees for landscape display. Alternatively, even when the
display is switched to the vertical display setting, the left and right voices can be respectively
output from the left and right speakers, and the directivity of the left and right voices is small,
and the small speaker can reinforce the bass portion which is likely to be insufficient. A display
device can be realized. According to the display device of the seventh aspect of the present
invention, the display device according to the seventh invention has three or more speakers, and
can display in landscape and portrait views, and it is rotated by 90 degrees to switch to the
setting of landscape display or portrait display. It is possible to realize a display device capable of
outputting left and right audio from the left and right speakers, respectively, and capable of
eliminating the phenomenon that the video lags behind the audio due to the processing time of
the video signal. According to the display device of the eighth aspect of the present invention, the
display device according to the eighth aspect has three or more speakers, and can display
horizontally and vertically, even when it is rotated 90 degrees and switched to the setting of
horizontally displayed or vertically displayed. It is possible to output left and right audio from the
left and right speakers respectively, and to realize a display device in which the audio of
headphones and external speakers not related to switching between horizontal display and
vertical display is not changed. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block
diagram showing a configuration of an embodiment of a display device according to the present
invention.
FIG. 2 is a block diagram showing a configuration example of an output switching circuit of a
display device according to the present invention. FIG. 3 is an explanatory view showing an
operation example of a display device according to the present invention. FIG. 4 is an explanatory
view showing an image of a delay time table of the display device according to the present
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invention; FIG. 5 is an explanatory view showing an operation example of a display device
according to the present invention. FIG. 6 is a block diagram showing a configuration example of
an output switching circuit of a display device according to the present invention. FIG. 7 is an
explanatory view showing an operation example of a display device according to the present
invention. FIG. 8 is an explanatory view showing an operation example of a display device
according to the present invention. Description of symbols 11 image size detection unit
(resolution detection means) 12 vertical / horizontal conversion circuit 13 LCD (Liquid Crystal
Display) (display unit) 14 vertical / horizontal display setting unit 15 display unit angle detection
unit (means for detecting rotation angle) 16 , 16a Output switching circuit (switching means) 17
Audio delay circuit 18 Delay time table (second reference table) 19 Switching table (first
reference table) 20 Audio external output terminal (terminal for outputting left and right audio
signals to the outside) 21 and 22 amplifiers 23 headphone jacks (terminals for outputting left
and right audio signals to the outside) 25 and 25a switching unit (switching means) 26 to 29
contacts 30 filter unit (low pass filter; LPF) 31 to 34 switching contacts 35 switching control Part
a to h, j, k, m, p, q, r Speaker
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