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JP2002290877

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2002290877
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
technique for outputting sound from a stereo speaker built in a projector.
[0002]
2. Description of the Related Art A projector for projecting an image on a screen or the like can
be used rapidly in home theaters and the like, and has been rapidly spread in recent years.
[0003]
Projectors are usually used on a desktop.
Here, the desk rest is a form in which the projector is placed on a desk or the like and an image is
projected and used from the front of the screen. Therefore, when the projector is used on a desk,
the right and left sides of the projector are respectively set to the right and the left side toward
the screen. Generally, the viewer views the image displayed on the screen in front of the screen.
Therefore, since the projector and the viewer both face in the same direction, from the viewpoint
of the viewer, the left and right of the projector match those of the viewer. Therefore, even if the
projector projects the image as it is on the screen, the viewer can view the correct image as the
image displayed on the screen.
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1
[0004]
On the other hand, as a use form of the projector, in addition to the above-described desktop
placement, two are known: ceiling and rear projection. Among these, the ceiling is a form in
which the projector is hung upside down from a ceiling or the like and an image is projected and
used from the front of the screen, and in the rear projection, the projector is placed behind the
screen and the image is viewed from the back of the screen It is a form which projects and uses.
[0005]
When the projector is used in a sunshade, the projector is placed upside down, so that the
projector is upside down and opposite to each other as viewed from the viewer. Therefore, if the
projector projects the image on the screen as it is, an image with the top and bottom and the left
and right reversed as viewed from the viewer will be displayed. In addition, when the projector is
used in rear projection, the projector is disposed behind the screen, so that the projector is
turned to the left or right as viewed from the viewer in front of the screen. Therefore, in this case,
if the projector directly projects the image on the screen, an image in which the left and right
sides are reversed as viewed from the viewer will be displayed.
[0006]
Therefore, in the case of ceiling use, the projector projects an image with the top and bottom and
the right and left inverted with respect to the original image, and in the case of rear projection,
the left and right with respect to the original image. The image is projected with only the image
inverted. In this way, even when the projector is used for skylight or rear projection, the viewer
can see the original correct image as the image displayed on the screen.
[0007]
In the case of a ceiling, the reason why the projector is not suspended vertically up and down but
is suspended upside down is as follows. That is, since the projector is normally designed to be
inclined (designed to project an image above the bottom of the projector when the projector is
used on a desk), the projector is suspended vertically If the bottom surface of the projector and
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2
the ceiling surface are not so far apart, a part of the projected image is blocked by the ceiling
surface and a normal image is not projected on the screen.
[0008]
By the way, the projector is capable of outputting not only the image but also the sound and, for
that purpose, the speaker is incorporated. In recent years, stereo speakers have come to be often
used as the speakers to provide more realism. Such stereo speakers are attached to the inside or
outside of the projector housing such that the right channel speaker is on the right side of the
projector and the left channel speaker is on the left side.
[0009]
Therefore, when the projector is used on a desk, as described above, the right and left side of the
projector matches that of the viewer as viewed from the viewer, so the right channel speaker is
arranged on the right as viewed from the viewer , Left channel speaker will be placed on the left
side. Therefore, for the viewer, the sound to be heard from the right (the sound of the right
channel) is heard from the speaker arranged on the right, and the sound to be heard from the left
(the sound of the left channel) It will be heard from the speaker located on the left side, there is
no problem at all.
[0010]
However, when the projector is used for ceiling or rear projection, as described above, the
projector is at least the right and the left opposite from the viewer, so the right channel speaker
is used. Is placed on the left side as viewed from the viewer, and the left channel speaker is
placed on the right side. Therefore, for the viewer, with respect to the image being viewed, the
sound that should normally be heard from the right (the sound of the right channel) is heard
from the speaker disposed on the left, and the sound that should normally be heard from the left
(the sound of the left channel ) Can be heard from the speaker disposed on the right side, and the
sound is reversed to the left and right with respect to the image, so that there is a problem that
the user may feel a sense of discomfort.
[0011]
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Therefore, the object of the present invention is to solve the above-mentioned problems of the
prior art, and even when used in ceiling or rear projection, the sound of the right channel can be
heard from the speaker disposed on the right as viewed from the viewer. The audio of the
channel is to provide a projector that can be heard from the speaker disposed on the left side as
viewed from the viewer.
[0012]
SUMMARY OF THE INVENTION In order to achieve at least a part of the above object, the
projector according to the present invention is a projector capable of projecting an image, which
is an inner side of the projector. Or stereo speaker with right channel speaker and left channel
speaker, and the right channel audio signal and left channel audio signal obtained from stereo
audio signal source, and selectively output destination of these audio signals In the first
switching state, the right channel audio signal is output to the right channel speaker, and the left
channel audio signal is output to the left channel speaker. In the second switching state, the right
channel audio signal is output. To the left channel speaker, the left channel audio signal to the
right channel In N'nerusupika, to the audio signal switching unit that outputs, in that it comprises
the gist.
[0013]
As described above, in the projector according to the present invention, the audio signal
switching unit selectively switches the output destinations of the right channel audio signal and
the left channel audio signal, and in the first switching state, the right channel audio signal is
output to the right channel speaker The left channel audio signal is output to the left channel
speaker, and in the second switching state, the right channel audio signal is output to the left
channel speaker, and the left channel audio signal is output to the right channel speaker. .
[0014]
Therefore, according to the projector of the present invention, when the projector is used for
ceiling or rear projection, the right channel audio signal is transmitted to the left channel speaker
by setting the audio signal switching unit to the second switching state. The left channel audio
signal is supplied to the right channel speaker, so that the projector is at least right to left as
viewed from the viewer, the right channel speaker is disposed on the left as viewed from the
viewer, and the left channel speaker is Even if it is arranged on the right side, for the viewer, the
sound of the right channel is heard from the left channel speaker arranged on the right side and
the sound of the left channel is arranged on the left side. Sound can be heard without any
problem without the sound being reversed with respect to the image. That.
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[0015]
In the projector according to the present invention, an image processing system capable of
selectively switching a normal image and a reversed image in which the vertical image and the
left and right of the normal image are respectively switched as the image and controlling the
audio signal switching unit When the image processing system projects the normal image, the
audio signal switching unit is set to the first switching state, and when the image processing
system projects the reverse image, the audio signal switching is performed. It is preferable to
further include a control unit that brings a unit into the second switching state.
[0016]
With such a configuration, it is possible to project a reverse image in which the top and bottom
and left and right are reversed, for example, even if the projector is used as a ceiling and it is
upside down and left and right viewed from the viewer Therefore, a normal image can be
displayed as viewed from the viewer.
Also, when such a reverse image is projected, the audio signal switching unit is switched to the
second switching state, so that the audio is also reversed horizontally in accordance with the
reverse image, and the audio is reversed to the left and right with respect to the image. There is
no sense of discomfort to the viewer because it does not happen.
[0017]
In the projector according to the present invention, an image processing system capable of
selectively switching and projecting a normal image and a reversed image obtained by inverting
the left and right of the normal image as the image, and controlling the audio signal switching
unit, When the image processing system projects the normal image, the audio signal switching
unit is set to the first switching state, and when the image processing system projects the reverse
image, the audio signal switching unit is switched It is preferable to further include a control unit
that brings the second switching state.
[0018]
By this configuration, even if the projector is used in rear projection and the viewer sees from the
left and right, it is possible to project a reverse image with the left and the right reversed, so that
the viewer sees from the viewer , Can display a normal image.
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Further, when the reverse image is projected, since the audio signal switching unit is in the
second switching state, the audio is also reversed left and right, and the audio is not reversed to
the image with respect to the image. There is no sense of discomfort.
[0019]
In the projector according to the present invention, an image processing system capable of
selectively switching between a normal image and a reversed image obtained by inverting the
upper and lower sides of the normal image as the image, and controlling the audio signal
switching unit, When the image processing system projects the normal image, the audio signal
switching unit is set to the first switching state, and the audio signal switching unit is also
switched when the image processing system projects the reverse image. It is preferable to further
include a control unit that brings the first switching state.
[0020]
For example, if the projector is used for skylighting and rear projection, the projector is upside
down as viewed from the viewer but not upside down.
Therefore, in this case, it is not necessary to project an image with only the top and bottom
reversed, and to reverse the sound left and right.
Therefore, by adopting the above-described configuration, it is possible to display a normal
image as viewed from the viewer even when the projector is used in ceiling and rear projection,
and the audio signal switching unit Since the audio is switched to the left and right, the right and
left of the image and the audio coincide with each other, and the viewer does not feel
uncomfortable.
[0021]
The projector according to the present invention further comprises a right channel audio output
terminal and a left channel audio output terminal, wherein the right channel audio signal
obtained from the stereo audio signal source is regardless of the switching state of the audio
signal switching unit. Preferably, the left channel audio signal is led to the right channel audio
output terminal, and the left channel audio signal is led to the left channel audio output terminal.
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[0022]
Usually, external stereo speakers are connected to the right channel and left channel audio
output terminals.
The external stereo speakers are separate from the projector and can be arranged independently
of the arrangement of the projector.
Thus, even if the projector is used in a skylight or rear projection, and the projector is at least left
to right as viewed from the viewer, the external stereo speakers are such that their left and right
match the left and right of the viewer, ie The right channel speaker can be disposed on the right
side as viewed from the viewer, and the external left channel speaker can be disposed on the left
side as viewed from the viewer.
[0023]
Therefore, as described above, the external stereo speaker can be provided regardless of the
arrangement state of the projector, by guiding the right channel audio signal to the right channel
audio output terminal and the left channel audio signal to the left channel audio output terminal.
Correct audio to the viewer by listening to the right channel audio from the external right
channel speaker located on the right and the left channel audio from the external left channel
speaker located on the left Can be provided.
[0024]
The audio output method of the present invention is an audio output method for outputting
audio from a stereo speaker attached to the inside or the outside of a projector, wherein the
projector is used upside down, or When the image is projected from the back of the screen, the
audio output from the stereo speaker is horizontally inverted and output.
[0025]
By executing such a method, among the stereo speakers built into the projector, the sound of the
right channel can be heard from the speaker disposed on the right as viewed from the viewer,
and the sound of the left channel can be viewed as left from the viewer As a result, the user can
hear from the speakers disposed at the side, and the sound is not reversed to the left and right
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with respect to the image, and the viewer does not feel discomfort.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below based on examples.
This explanation will be made in the order of the items listed below.
A.
Projector configuration: B.
Projector Operation: B-1.
Operation on desk: B-2. Operation with a balance: B-3. Operation in rear projection: B-4.
Operation in the sky climbing rear projection: C-1. Modification 1: C-2. Modification 2: C-3.
Modification 3: C-4. Modification 4: C-5. Modification 5:
[0027]
A. Configuration of Projector: FIG. 1 is a block diagram showing the configuration of a
projector as an embodiment of the present invention.
[0028]
As shown in FIG. 1, the projector 100 according to the present embodiment is roughly divided
into an audio processing system, an image processing system, and an operation / control system.
Among these, the audio processing system is externally provided. Audio input terminals Rin and
Lin for inputting an audio signal, analog switches 102 and 104 for switching the output
destination of the audio signal, which are characteristic parts of the present invention, an
amplifier 106 for amplifying the audio signal, 108, 110, 112, stereo speakers RSP, LSP as built-in
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speakers, and audio output terminals Rout, Lout for outputting an audio signal to the outside.
[0029]
Although the stereo speakers RSP and LSP, which are built-in speakers, are attached to the inside
of the casing of the projector 100, they may be attached to the outside of the casing.
[0030]
The image processing system also includes an illumination optical system 132 for outputting
illumination light, a liquid crystal light valve 134 for forming image light, a projection optical
system 136 for projecting the image light, and an image signal from the outside. And an image
processing unit 140 for processing an image signal, and a liquid crystal drive circuit 142 for
driving a liquid crystal light valve 134 based on the processed image signal. There is.
[0031]
The operation and control system includes a microcomputer unit (hereinafter referred to as an
MCU) 130 for controlling the analog switches 102 and 104, the liquid crystal light valve 134 and
the like, and a remote controller (hereinafter referred to as an MCU) for operating the projector
from the outside. The remote control signal processing unit 128 processes the signal from the
remote control 126 and transmits the signal to the MCU 130.
[0032]
B.
Operation of Projector: As described above, since the projector has three usage forms, that is,
desktop placement, ceiling attachment, and rear projection, regarding the operation of the
projector 100 of this embodiment in each usage form, It will be described below.
[0033]
B−1.
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9
Operation on a Desktop: FIG. 2 is an explanatory diagram for explaining how to output sound
when the projector 100 of FIG. 1 is used on a desktop.
[0034]
When using it on a desk, first, the installer places the projector 100 on a desk (not shown) as
shown in FIG. 2 and externally connects, for example, the DVD player 200 as an image / sound
signal source Do.
Then, when the operator operates the remote controller 126 to instruct the "place on desk"
mode, the instruction is transmitted from the remote controller 126 to the remote control signal
processing unit 128 as a remote control signal.
The remote control signal processing unit 128 analyzes the transmitted remote control signal
and outputs the content of the instruction to the MCU 130. When the MCU 130 recognizes from
the input instruction contents that the "place on desktop" is selected, it instructs the liquid crystal
drive circuit 142 to "normal display", and both the analog switches 102 and 104 are on the a
side. Control to switch to
[0035]
Thereafter, when reproduction by the DVD player 200 is started, an image signal is input from
the DVD player 200 to the image input terminal Vin of the projector 100, and a right channel
audio signal is input to the audio input terminal Rin of the right channel. Is input, and the left
channel audio signal is input to the audio input terminal Lin of the left channel.
[0036]
The input image signal is subjected to predetermined processing by the image processing unit
140 and then input to the liquid crystal drive circuit 142.
The liquid crystal drive circuit 142 drives the liquid crystal light valve 134 based on the input
image signal. At this time, the liquid crystal drive circuit 142 drives the liquid crystal light valve
134 so that a normal image is projected in accordance with the above-mentioned "normal
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display" instruction from the MCU 130.
[0037]
Since the liquid crystal light valve 134 is illuminated substantially uniformly by the illumination
optical system 132, when driven as described above, the image light is formed by the driving,
and the formed image light is projected by the projection optical system 136. The image is
projected on a screen, and a normal image is displayed on the screen as shown in FIG.
[0038]
On the other hand, since the analog switches 102 and 104 are both switched to the a side under
the control of the MCU 130 described above, the right channel audio signal input from the audio
input terminal Rin passes through the analog switch 102 and the amplifier 106. Through the
right channel speaker RSP.
The left channel audio signal input from the audio input terminal Lin passes through the analog
switch 104 and is input to the left channel speaker LSP via the amplifier 108. Therefore, as
shown in FIG. 2, the right channel speaker RSP outputs the right channel sound, and the left
channel speaker LSP outputs the left channel sound.
[0039]
Also, although nothing is connected to the audio output terminals Rout and Lout in FIG. 2, the
external right channel speaker is connected to the audio output terminal Rout of the right
channel and the audio output terminal Lout of the left channel as external stereo speakers. If the
external left channel speakers are connected to each other, the right channel audio signal input
from the audio input terminal Rin is output from the audio output terminal Rout of the right
channel via the amplifier 110, and the external right The left channel audio signal input to the
channel speaker and input from the audio input terminal Lin is output from the audio output
terminal Lout of the left channel via the amplifier 112 and input to the external left channel
speaker. As a result, the sound of the right channel is output from the external right channel
speaker, and the sound of the left channel is output from the external left channel speaker.
[0040]
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B−2. Operation on a ceiling: FIG. 3 is an explanatory diagram for explaining how to output
sound when the projector 100 of FIG. 1 is used on a ceiling.
[0041]
In the case of using in the ceiling, first, the installer sets the projector 100 upside down and
hangs it from a ceiling (not shown) or the like as shown in FIG. For example, a DVD player 200 is
connected as a signal source. Then, when the operator operates the remote control 126 to
instruct the “ceiling mode”, the instruction is transmitted to the remote control signal
processing unit 128 as a remote control signal, and the remote control signal processing unit
128 The remote control signal is analyzed, and the instruction content is output to the MCU 130.
When the MCU 130 recognizes from the input instruction content that the “tempering mode”
is selected, the MCU 130 instructs the liquid crystal drive circuit 142 to “vertically reverse /
horizontally reverse display” and to the analog switches 102 and 104, It controls so that all
switch to b side.
[0042]
Then, when reproduction by the DVD player 200 is started, an image signal is input from the
DVD player 200 to the image input terminal Vin of the projector 100 as in the case of the
“place on desktop” mode. The right channel audio signal is input to the audio input terminal
Rin, and the left channel audio signal is input to the audio input terminal Lin of the left channel.
[0043]
The input image signal is input to the liquid crystal drive circuit 142 via the image processing
unit 140, and the liquid crystal drive circuit 142 drives the liquid crystal light valve 134 based
on the image signal.
At this time, the liquid crystal drive circuit 142 is a liquid crystal light so that an image in which
the vertical and horizontal inversions are reversed with respect to the normal image is projected
in accordance with the instruction of “vertical inversion and horizontal inversion display”
described above input from the MCU 130 The valve 134 is driven.
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[0044]
As a result, when the image light formed by the liquid crystal light valve 134 is projected on the
screen, as viewed from the projector 100 which is hung upside down from the ceiling as shown
in FIG. However, when viewed from the viewer, a normal image is displayed on the screen.
[0045]
On the other hand, since the analog switches 102 and 104 are both switched to the b side
opposite to the case of the "place on desktop" under the control of the MCU 130 described above,
the right channel audio input from the audio input terminal Rin is The signal, in turn, passes
through the analog switch 104 and is input to the left channel speaker LSP via the amplifier 108.
The left channel audio signal input from the audio input terminal Lin passes through the analog
switch 102 and is input to the right channel speaker RSP via the amplifier 106. Therefore, in the
case of the "temping mode", as shown in FIG. 3, the sound of the left channel is output from the
right channel speaker RSP, and the sound of the right channel is output from the left channel
speaker LSP.
[0046]
At this time, as described above, since the projector 100 is suspended upside down from the
ceiling, from the viewer's point of view, the top and bottom are opposite and the right and left are
also opposite, and the right channel speaker RSP is viewed from the viewer. And the left channel
speaker LSP is disposed on the right side. Therefore, for the viewer, for the image being viewed,
the sound to be heard from the right (sound on the right channel) is heard from the speaker LSP
disposed on the right, and sound to be heard from the left (sound on the left channel) Will be
heard from the speaker RSP disposed on the left side. Therefore, since the sound does not
reverse to the left and right with respect to the image, the viewer can listen to the sound without
discomfort.
[0047]
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Also in FIG. 3, although nothing is connected to the audio output terminals Rout and Lout,
temporarily, as an external stereo speaker, an external right channel speaker is output to the
audio output terminal Rout of the right channel and an audio output of the left channel Even if
the external left channel speaker is connected to the terminal Lout, the right channel audio signal
input from the audio input terminal Rin is also transmitted to the right through the amplifier
110, as in the case of the "place on desktop" mode. The left channel audio signal output from the
audio output terminal Rout of the channel and input to the external right channel speaker and
input from the audio input terminal Lin is output from the audio output terminal Lout of the left
channel via the amplifier 112 , Are input to the external left channel speaker. As a result, the
sound of the right channel is output from the external right channel speaker, and the sound of
the left channel is output from the external left channel speaker.
[0048]
Since the external stereo speakers are separate from the projector 100, they can be arranged
irrespective of the arrangement of the projector. Therefore, even if the projector 100 is hung
upside down from the ceiling and the top and bottom and left and right are reversed, the external
stereo speaker has its right and left aligned with the left and right of the viewer, ie, the external
right channel The speakers can be arranged on the right as viewed from the viewer and the
external left channel speakers can be arranged on the left as viewed from the viewer.
[0049]
Therefore, even when such an external stereo speaker is installed, for the viewer, the sound of
the right channel is from the external right channel speaker disposed on the right side, and the
sound of the left channel is on the left side. The viewer can hear the audio without any problem
without the left and right inversion with respect to the image and the audio from the built-in
stereo speaker, respectively.
[0050]
B−3.
Operation in Rear Projection: FIG. 4 is an explanatory diagram for explaining how to output
sound when the projector 100 of FIG. 1 is used in rear projection.
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[0051]
In the case of rear projection, first, the installer places the projector 100 behind the transmissive
screen 300 as shown in FIG. 4 and outside the projector 100 as an image / sound signal source,
for example, a DVD player Connect 200. Then, when the operator operates remote control 126 to
instruct "rear projection mode", the instruction is transmitted to remote control signal processing
unit 128, and remote control signal processing unit 128 transmits the instruction content to
MCU 130. . When the MCU 130 recognizes that the “rear projection mode” is selected from
the contents of the instruction, the MCU 130 instructs the liquid crystal drive circuit 142 to
“reverse horizontal display”, and the analog switches 102 and 104 “ceiling mode”. As in the
case of, control is performed so as to switch to the b side.
[0052]
When reproduction by the DVD player 200 is started, the image signal is input to the image
input terminal Vin of the projector 100, the right channel audio signal to the audio input
terminal Rin of the right channel, and the audio input terminal Lin to the left channel. The left
channel audio signals are respectively input.
[0053]
The input image signal is input to the liquid crystal drive circuit 142 via the image processing
unit 140, and the liquid crystal drive circuit 142 drives the liquid crystal light valve 134 based
on the image signal.
At this time, the liquid crystal drive circuit 142 drives the liquid crystal light valve 134 so that an
image obtained by inverting only the left and right with respect to the normal image is projected
in accordance with the instruction of “reverse horizontal display” input from the MCU 130.
[0054]
As a result, when the image light formed by the liquid crystal light valve 134 is projected onto
the transmissive screen 300, it is an image in which the left and right are reversed, as viewed
from the projector 100 disposed behind the transmissive screen 300. When viewed from the
viewer in front of the mold screen 300, a normal image is displayed on the transmission screen
300, as shown in FIG.
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[0055]
On the other hand, since the analog switches 102 and 104 are both switched to the b side under
the control of the MCU 130 described above, the right channel audio signal input from the audio
input terminal Rin is the same as in the case of "ceiling mode". Are input from the analog switch
104 via the amplifier 108 to the left channel speaker LSP.
The left channel audio signal input from the audio input terminal Lin is input from the analog
switch 102 via the amplifier 106 to the right channel speaker RSP. Therefore, also in the case of
the "rear projection mode", as shown in FIG. 4, the sound of the left channel is outputted from the
right channel speaker RSP, and the sound from the left channel speaker LSP is outputted. , The
sound of the right channel is output.
[0056]
As described above, since the projector 100 is behind the transmissive screen 300, when viewed
from the viewer in front of the transmissive screen 300, the right and left are opposite, so the
right channel speaker RSP is viewed from the viewer The left channel speaker LSP is disposed on
the right side. Therefore, by the audio being output as described above, for the viewer, for the
image being viewed, the audio to be heard from the right (the audio of the right channel) can be
heard from the speaker LSP disposed on the right The audio to be heard from the left side (audio
of the left channel) will be heard from the speaker RSP disposed on the left side. Therefore, in
this case as well, the audio is not reversed left and right with respect to the image, and the viewer
can hear the audio without feeling discomfort.
[0057]
Also in FIG. 4, although nothing is connected to the audio output terminals Rout and Lout,
temporarily, the external right channel speaker is externally connected to the audio output
terminal Lout of the right channel, and the external right channel speaker is externally connected
to the audio output terminal Lout of the left channel. Even if the left channel speakers are
respectively connected, the right channel audio signal input from the audio input terminal Rin is
transmitted through the amplifier 110 as in the case of the "place on desktop" mode and the
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"ceiling mode". The left channel audio signal output from the right channel audio output terminal
Rout and input to the external right channel speaker and input from the audio input terminal Lin
is output from the left channel audio output terminal Lout via the amplifier 112 Are input to the
external left channel speaker. As a result, the sound of the right channel is output from the
external right channel speaker, and the sound of the left channel is output from the external left
channel speaker.
[0058]
Also in the "rear projection mode", the external stereo speakers are separate from the projector
100, and therefore can be arranged regardless of the arrangement of the projectors. Therefore,
even if the projector 100 is placed behind the transmissive screen 300 so that the left and right
sides are opposite to the viewer, the external stereo speakers are such that the left and right
match the left and right of the viewer, That is, the external right channel speaker can be disposed
on the right side as viewed from the viewer, and the external left channel speaker can be
disposed on the left side as viewed from the viewer.
[0059]
Therefore, for the viewer, the sound of the right channel can be heard from the external right
channel speaker disposed on the right side, and the sound of the left channel can be heard from
the external left channel speaker disposed on the left side. As a result, the viewer can listen to the
audio without any problem without inverting the image or the audio from the built-in stereo
speaker.
[0060]
B−4.
Operation in the ceiling rear projection: Well, as described above, there are three types of usage
of the projector, such as desktop positioning, ceiling ceiling, and rear projection, as described
above. It is conceivable to use it in the sky and rear projection.
[0061]
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In the case of using in the ceiling and rear projection, first, the installer turns the projector 100
upside down from a ceiling (not shown) or the like, and places the projector 100 behind the
transmissive screen 300, As an image / sound signal source, for example, a DVD player 200 is
connected to the outside of the projector 100. Then, when the operator operates the remote
control 126 to designate the "temporary rear projection mode", the instruction is transmitted to
the remote control signal processing unit 128 as a remote control signal, and the remote control
signal processing unit 128 The remote control signal is analyzed, and the instruction content is
output to the MCU 130. When the MCU 130 recognizes from the input instruction contents that
the "temporary rear projection mode" is selected, the MCU 130 instructs the liquid crystal drive
circuit 142 to "upside down display", and to the analog switches 102 and 104, It controls so that
all switch to a side.
[0062]
Then, when reproduction by the DVD player 200 is started, an image signal is input from the
DVD player 200 to the image input terminal Vin of the projector 100, and a right channel audio
signal is input to the audio input terminal Rin of the right channel. Is input, and the left channel
audio signal is input to the audio input terminal Lin of the left channel.
[0063]
The input image signal is input to the liquid crystal drive circuit 142 via the image processing
unit 140, and the liquid crystal drive circuit 142 drives the liquid crystal light valve 134 based
on the image signal.
At this time, the liquid crystal drive circuit 142 drives the liquid crystal light valve 134 so that an
image obtained by reversing only the upper and lower sides with respect to the normal image is
projected according to the instruction of the above-described “vertical inversion display” input
from the MCU 130. .
[0064]
At this time, as described above, since the projector 100 is hung upside down from the ceiling
and is disposed behind the transmissive screen 300, only the upper and lower sides are reversed
from the viewpoint of the viewer. Therefore, when the image light formed by the liquid crystal
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light valve 134 driven as described above is projected on the screen, the image is the image
inverted upside down from the viewpoint of the projector 100, but normal from the viewpoint of
the viewer The image is displayed on the screen.
[0065]
On the other hand, since the analog switches 102 and 104 are both switched to the same side a
as in the case of the "place on desktop" under the control of the MCU 130 described above, the
right channel audio signal input from the audio input terminal Rin Are input to the right channel
speaker RSP via the amplifier 106 through the analog switch 102. The left channel audio signal
input from the audio input terminal Lin passes through the analog switch 104 and is input to the
left channel speaker LSP via the amplifier 108. Therefore, the right channel speaker RSP outputs
the right channel sound, and the left channel speaker LSP outputs the left channel sound.
[0066]
As described above, since the projector 100 is only the upper side and the lower side as viewed
from the viewer, the right channel speaker RSP is disposed on the right side as viewed from the
viewer, as in the case of the “place on desk” mode. The left channel speaker LSP is disposed on
the left side. Therefore, for the viewer, for the image being viewed, the sound to be heard from
the right (sound on the right channel) is heard from the speaker RSP disposed on the right, and
the sound to be heard from the left (sound on the left channel) It will hear from the speaker LSP
arrange | positioned on the left side.
[0067]
If the external right channel speaker is connected to the audio output terminal Rout of the right
channel, the external left channel speaker is connected to the audio output terminal Lout of the
left channel, and the external left channel speaker is connected as an external stereo speaker,
The input right channel audio signal is output from the audio output terminal Rout of the right
channel via the amplifier 110 and input to the external right channel speaker, and the left
channel audio signal input from the audio input terminal Lin is an amplifier The signal is output
from the audio output terminal Lout of the left channel through 112 and input to the external
left channel speaker. As a result, the sound of the right channel is output from the external right
channel speaker, and the sound of the left channel is output from the external left channel
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speaker.
[0068]
C. Modifications: The present invention is not limited to the above-described embodiments and
embodiments, and can be implemented in various modes without departing from the scope of the
invention.
[0069]
C−1. Modification Example 1: In the above-described embodiment, the MCU 130 switches
the output destination of the audio signal by controlling the analog switches 102 and 104 in
accordance with the mode instruction from the operator, but the present invention is limited to
this. Instead, the operator may directly switch the analog switches 102 and 104 by operating a
button, a knob or the like provided on the projector 100.
[0070]
C−2. Modified Example 2 In the above-described embodiment, in the case of the “temple
mode”, the MCU 130 recognizes that the “temple mode” is selected by the operator
instructing the “temple mode”. However, the present invention is not limited to this, and, for
example, a gravity sensor, a posture sensor, etc. are provided in the projector 100, and when the
projector 100 is arranged upside down by the installer, the sensor By detecting that and
transmitting it to the MCU 130, the MCU 130 may recognize that the "ceiling mode" is selected.
[0071]
C−3. Modification 3: In the above-described embodiment, the analog switch is used as the
audio signal switching unit, but a digital switch may be used. Alternatively, not only the
electronic switch but also a mechanical switch may be used.
[0072]
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C−4. Modification 4: In the above embodiment, the stereo audio signal and the image signal
are input from the outside, but the projector 100 itself may have a stereo audio signal source and
an image signal source.
[0073]
C−5. Modification 5: In the above-described embodiment, by changing the driving method by
the liquid crystal drive circuit 142, the image which is vertically inverted or horizontally inverted
is generated Alternatively, such an image may be optically formed in the projection optical
system 136 or the like.
[0074]
C−6. Modification 6 In the embodiment described above, the liquid crystal light valve 134 is
used as the electro-optical device in the above-described embodiment, but instead, a micro mirror
light modulator, a CRT, or the like may be provided. As the micro mirror light modulation device,
for example, DMD (digital micro mirror device) (trademark of TI Corporation) can be used.
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