JP5407176B2 - Projection system - Google Patents

Description

The present invention relates to a preferred projection system in a data projector apparatus or the like for a battery as a power source especially.

  In recent years, with the spread of personal computers, there are increasing cases of giving presentations by connecting a personal computer to a data projector apparatus. In such a case, there are many notebook-type personal computers that are battery-driven and have a continuous operation time exceeding 10 hours. On the other hand, a battery-driven data projector device consumes a lot of power for light emission driving and cooling of a light source such as a high-pressure mercury lamp, and therefore, continuous operation time equivalent to that of a notebook personal computer. As a result, it has become a factor that impairs the mobility of the system.

In this type of battery-powered projector, in order to be able to suppress power consumption without impairing convenience, it is determined whether or not an image signal is input, a cable for transmitting the image signal is pulled out, or an image supply device When the reproduction stop operation is performed on the side, and the input of the image signal is interrupted, an instruction to turn off the light source and the sampling of the RGB signal by the A / D converter are considered. (For example, Patent Document 1)
JP 2006-330224 A

  However, the technique described in Patent Document 1 is designed to suppress wasteful power consumption by judging a state in which no image signal is input and projection is not performed. Therefore, it is not considered at all to suppress further unnecessary power consumption in a state where projection is performed.

The present invention has been made in view of the circumstances described above, and an object, in the course of performing the projection operation in accordance with the images signals, efficient use of power by minimizing the consumption of power It is to provide a projected shadow system that can be.

Invention of claim 1, wherein, a projection system, an image output means to output an analog image signal, determining hands stage determines the presence or absence of change of content of the image signal output by the image output means, the determination judgment result output control means to control the output of the RGB image data and synchronization signals sac Chi said synchronization signal included in the analog image signal at the image output means in accordance with the image output apparatus having an on means Image input means for inputting analog image signals, A / D conversion means for converting analog image signals input from the image input means into digital image data,
Image storage means for storing digital image data obtained by the A / D conversion means, projection means for projecting a light image based on the image data stored by the image storage means, and analog image input by the image input means Judgment means for judging the presence or absence of a synchronization signal controlled by the output control means, and A / D conversion control means for stopping the operation of the A / D conversion means according to the judgment result of the judgment means. And a projection device provided .
According to a second aspect of the present invention, in the first aspect of the invention, when the output control means determines that there is no change in the content of the image signal output by the image output means, the image output and controls so as to stop the output of the RGB image data contained in the analog image signal and a synchronization signal sac Chi said synchronization signal in means.

According to a third aspect of the present invention, in the above claim 1, wherein, when there is no input of the RGB image data and synchronization signals sac Chi said synchronizing signal contained in the image signals above SL analogue, said determining means determines that there is no change in the analog image signals input from the image input unit, the a / D conversion control means is characterized by stopping the operation of the a / D converter.

According to a fourth aspect of the invention, in the invention according to any one of the first to third aspects of the invention, when the operation of the A / D conversion means is stopped by the A / D conversion control means, the projection means Of the image data stored in the storage means, the image data before the operation of the A / D conversion means is read out and projected.
According to a fifth aspect of the present invention, in the invention of the fourth aspect , when the operation of the A / D conversion means is stopped by the A / D conversion control means, the image data stored in the image storage means The image data before the stop of the operation of the A / D conversion means is read out and projected n times (n is an integer of 2 or more) .
According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the A / D conversion is performed when the determination unit determines that there is the synchronization signal controlled by the output control unit. The control means reads out and projects the image data stored in the image storage means by the projection means without stopping the operation of the A / D conversion means, and then the determination means determines whether or not the synchronization signal is present. Is judged again.

According to a seventh aspect of the present invention, there is provided a power supply means for selecting one of a plurality of systems including a battery and supplying operating power to each means included in the device according to any of the first to sixth aspects of the invention. Further, the A / D conversion control means stops the operation of the A / D conversion means according to the determination result of the determination means while the battery is selected by the power supply means. .

  According to the present invention, it is possible to efficiently use a power source while suppressing power consumption as much as possible in the process of performing a projection operation according to an input image signal.

(First embodiment)
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment when a projection system according to the present invention is applied to a projection system using a personal computer and a DLP (Digital Light Processing) (registered trademark) data projector apparatus will be described below with reference to the drawings. .

  FIG. 1 shows the appearance and connection configuration of the entire system. The personal computer 1 and the data projector apparatus 2 are wired by a cable 3 having VGA terminals at both ends. An image signal of a presentation program reproduced by the personal computer 1 is appropriately sent to the data projector device 2 via the cable 3 and projected onto a whiteboard used as the screen SC by the data projector device 2.

  The data projector apparatus 2 forms a light image corresponding to image data using a micromirror element based on an image signal sent from the personal computer 1 and projects it from a projection lens unit arranged on the front surface of the housing. Various images are projected and displayed within the projection range PA on the whiteboard used as the target screen SC.

  Next, the configuration of the personal computer 1 will be described with reference to FIG. FIG. 2 shows a hardware configuration of the personal computer 1, and a north bridge 12 is connected to the CPU 11 that controls various processes and a front side bus FSB.

  The north bridge 12 is further connected to the main memory 13 via the memory bus MB and to the graphic controller 14 and the graphic memory 15 via the graphics interface AGP, and is also connected to the south bridge 16 mainly between them. Execute I / O control.

  The south bridge 16 is connected to a PCI bus 17, a keyboard / mouse 18, a video encoder 19, a wireless LAN interface 20, a multi-disk drive 21, and a hard disk device (HDD) 22, and mainly between these peripheral circuits and the north bridge 12. Performs input / output control.

  It should be noted that the individual elements constituting the personal computer 1 are very general well-known techniques, and therefore description thereof is omitted.

  The video encoder 19 generates and outputs a VGA video signal, which is an analog image signal, from a given digital image signal, and is a display constituted by a color TFT (thin film transistor) liquid crystal display panel (not shown). While the display unit is driven for display, the VGA video signal is output to an external device, for example, the data projector device 2 in FIG.

Next, the circuit configuration of the data projector device 2 will be described with reference to FIG.
FIG. 3 is a block diagram showing a functional configuration of an electronic circuit provided in the data projector device 2.
In the figure, 31 is an input / output connector portion provided on the back side of the main body casing of the data projector device 2, for example, a pin jack (RCA) type video input terminal, an analog RGB component signal input DE-15, It consists of a HD 15, a VGA terminal also called mini D-Sub 5, and a USB terminal.

  Image signals of various standards input from the input / output connector unit 31 are stored in the input buffer 33 via the input / output interface (I / F) 32 and the system bus SB. The input / output interface 32 includes an A / D converter 32a. When the input image signal is analog, the input / output interface 32 samples and digitizes the input image signal, and holds the digitized image data in the input buffer 33.

  After the image data held in the input buffer 33 is unified into image data of a predetermined format suitable for projection including the number of resolutions, the number of gradations, etc. The data is sent to the processing unit 35.

  At this time, a character image for OSD (On Screen Display) and symbols such as a pointer are also sent to the projection image processing unit 35 in a state of being superimposed on the image data as necessary.

  The projection image processing unit 35 is a spatial light modulation element (SOM) corresponding to the storage contents of the video RAM 36 after the image data sent from the image conversion unit 34 is developed and stored in the video RAM 36. The micromirror element 37 is driven.

  That is, the projection image processing unit 35 is held in the video RAM 36 by a faster time-division drive that multiplies a predetermined frame rate, for example, 60 [frames / second], the number of color component divisions, and the number of display gradations. The micromirror element 37 is driven based on the image data.

  This micromirror element 37 is controlled by the reflected light by controlling each inclination angle of a plurality of micromirrors arranged in an array, for example, XGA (horizontal 1024 × vertical 768 dots) individually at a high speed. A light image is formed.

  On the other hand, a light source lamp 39 using an ultra-high pressure mercury lamp disposed in the reflector 38 emits white light with high luminance. The white light emitted from the light source lamp 39 is colored in primary colors in a time-division manner through the color wheel 40, and is converted into a luminous flux having a uniform luminance distribution by the integrator 41, and then totally reflected by the mirror 42 to the micromirror element 37. Irradiated.

  Then, an optical image is formed by the reflected light from the micromirror element 37, and the formed optical image is projected and displayed on the screen SC of FIG.

  The projection lens unit 43 can arbitrarily change the in-focus position and the zoom position (projection angle of view). That is, among a plurality of optical lenses constituting the projection lens unit 43, a focus lens and a zoom lens (not shown) are moved back and forth along the optical axis direction, respectively, and the focus position and the zoom position are controlled. The lens moves as the stepping motor (M) 44 rotates.

  The projection light processing unit 46 controls the lighting of the light source lamp 39, the rotation of the motor (M) 45 for the color wheel 40, and the rotation of the stepping motor 44.

  The CPU 47 controls all the operations of the above circuits. The CPU 47 executes a control operation in the data projector device 2 using a main memory 48 composed of DRAM and a program memory 49 which is an electrically rewritable nonvolatile memory storing an operation program and various fixed data. To do.

  The CPU 47 executes various projection operations in accordance with key operation signals from the operation unit 50. The operation unit 50 includes a key operation unit provided in the main body of the data projector device 2 and a laser light receiving unit that receives infrared light from a remote controller (not shown) dedicated to the data projector device 2. A key operation signal based on the key operated via the controller is directly output to the CPU 47.

  The CPU 47 is further connected to the indicator unit 51, the audio processing unit 52, and the power supply processing unit 53 via the system bus SB.

  The indicator unit 51 is disposed on the upper surface of the housing of the data projector device 2, and the operation state of the data projector device 2, for example, the power on / off state, the temperature abnormality of the light source lamp 39, and the automatic alignment by the projection lens unit 43. The focus / trapezoid correction operation etc. are displayed by lighting / flashing with various LED lamps.

  The sound processing unit 52 includes a sound source circuit such as a PCM sound source, converts the sound data given during the projection operation into an analog signal, drives the speaker unit 54 and emits a loud sound, and generates a beep sound or the like if necessary.

  The power source processing unit 53 manages the battery 55 and the AC power source 56 that are the power source of the data projector device 2. When the AC power source 56 is connected, the power from the AC power source 56 is appropriately set to a necessary voltage. In addition to being supplied to each of the above circuits, the battery 55 is charged at the request of the CPU 47. The battery 55 includes a secondary battery, for example, a lithium ion battery and a drive circuit thereof.

  In addition, when the AC power supply 56 is not connected, the power supply processing unit 53 supplies necessary power to the above circuits using the power charged in the battery 55 instead of the AC power supply 56.

Next, the operation of the above embodiment will be described.
4 and 5 show a case where the personal computer 1 outputs an analog image signal, the data projector apparatus 2 inputs the image signal via the cable 3, and performs projection according to the input image signal. The basic processing contents for the image signals of both the computer 1 and the data projector apparatus 2 are shown.

  FIG. 4 shows the content of image signal transmission processing executed by the personal computer (PC) 1 on the transmission side for each output image signal for one frame in comparison with the image signal of the immediately preceding frame. is there.

  This process is executed under the control of the CPU 11 when the video encoder 19 creates an analog image signal and outputs it to the cable 3. That is, as a result of comparing the image signal of the frame with the same signal of the immediately preceding frame, it is determined whether or not the content of the image signal has changed (step S101).

  If it is determined that the content of the image signal has changed, the signal for each of the RGB color components constituting the image signal is sent to the cable 3 together with the horizontal and vertical synchronization signals in accordance with the standard of the original analog RGB component signal. After outputting (step S102), the process returns to step S101 so as to correspond to the image signal of the next frame.

  On the other hand, if it is determined in step S101 that the content of the image signal has not changed, it deviates from the original analog RGB component signal standard, and each of the RGB colors constituting the image signal without the horizontal and vertical synchronization signals. After outputting only the signal for each component to the cable 3 (step S103), the process returns to step S101 so as to correspond to the image signal of the next frame.

  Note that the method of determining whether or not the image signal has changed in step S101 is not limited to the method of comparing the above-described image signal between the previous and subsequent frames, and for example, an image projected by an operator operating the personal computer 1. It may be determined based on whether or not a predetermined operation for switching is input. In any case, it is important to determine whether there is a change in the image signal, and the method is not particularly limited.

  When the personal computer 1 outputs an image signal based on a presentation program often used in this type of system, unlike general moving image data, an image signal whose content does not change is on the order of several seconds to several minutes. Will continue to be output.

  Therefore, in FIG. 4, it is assumed that the determination in step S101 is performed in units of frames. However, if the time lag that does not make the user feel uncomfortable is, for example, about 0.5 seconds and the frame rate is 30 [frames / second]. Alternatively, the determination in step S101 may be performed at a frequency of about once every 15 frames of the image signal, and the processing in step S102 or step S103 may be performed according to the determination result.

  On the other hand, on the side of the data projector apparatus 2 that performs the projection operation by inputting the image signal output from the personal computer 1, the input / output interface 32 receives the image signal input from the input / output connector unit 31 via the cable 3.

FIG. 5 shows the processing contents from reception of an image signal to projection performed every time the data projector device (PJ) 2 on the receiving side inputs one frame of the image signal.
This process is executed under the control of the CPU 47 for the image signal input by the input / output interface 32 via the input / output connector unit 31.

  Initially, it is determined whether or not a synchronization signal is input together with signals for each of the RGB color components constituting the image signal when the image signal is input (step R101).

  Here, when it is determined that the synchronization signal is also input, it is as the original analog RGB component signal standard, and the personal computer 1 outputs an image signal having a content different from the image signal output immediately before, The input image signal is digitized by the A / D converter 32a (step R102).

  Then, the obtained digital value image data is held in the input buffer 33 (step R103).

  The image data held in the input buffer 33 is read out and converted into a format suitable for projection by the image conversion unit 34, and a corresponding optical image is formed by the micromirror element 37 by the projection image processing unit 35. More projection is performed on the screen SC to be projected (step R104). Thereafter, the processing returns to step R101 so as to correspond to the image signal of the next frame.

  If it is determined in step R101 that the sync signal is not input with only the signals for each of the RGB color components constituting the image signal when the image signal is input, the standard of the analog RGB component signal is out of the standard. Therefore, assuming that the personal computer 1 has output at least an image signal having the same content as the image signal output immediately before, the A / D conversion unit 32a is temporarily stopped, and power consumption in the A / D conversion unit 32a is performed. Is suppressed (step R105).

  In this case, assuming that the image to be projected is the same as the previous frame, the image data already stored in the input buffer 33 is read again, and the image conversion unit 34 converts the image data into a format suitable for projection. The processing unit 35 forms a corresponding optical image with the micromirror element 37 and projects it onto the screen SC to be projected from the projection lens unit 43 (step R104). Thereafter, the processing returns to step R101 so as to correspond to the image signal of the next frame.

  As described above, even when there is no change in the image signal, the data projector device 2 receives only the image signal by setting the configuration in which only the synchronization signal is stopped and the image signal is output. Thus, it can be determined that there is an image signal to be displayed, but the image signal is not changed. In this case, the A / D converter 32a is temporarily stopped as described above. Consumption is suppressed, and the image data held in the input buffer 33 is read again and projected.

  In the present embodiment, the personal computer 1 is configured to stop outputting the synchronization signal in step S103 when there is no change in the image signal in step S101. The output of the image signal may be stopped without stopping the output of the signal.

In this case, the data projector device 2 determines whether or not there is an input of an image signal in step R101, and if there is no input of an image signal and only an input of a synchronization signal, the data projector device 2 displays not a no-signal state. It can be determined that there is an image signal to be processed but the image signal has not changed, and the A / D converter 32a is temporarily stopped, and the image data held in the input buffer 33 is read again. To project.
In any case, when there is no change in the image signal, it is sufficient that the A / D conversion of the data projector device 2 can be stopped.

  In the data projector device 2 side, the determination in step R101 is performed in units of frames as described on the personal computer 1 side. However, the time lag that the user does not feel uncomfortable is 0, for example. If the frame rate is set to about 5 seconds and the frame rate is set to 30 [frames / second], the determination of step R101 is performed at a frequency of about once every 15 frames of the image signal, and depending on the determination result, steps R102 to R104 or The process of step R104 may be performed.

  As described above, according to the present embodiment, in the process of performing the projection operation according to the image signal input on the data projector apparatus 2 side, the operation of the A / D conversion unit 32a is executed only when necessary, and is unnecessary. When it was determined that the condition was, it was temporarily stopped.

As a result, in this type of general data projector apparatus, it is assumed that the power consumption of the lamp serving as the light source is 30 to 50 [W] and the power consumption of the control system is about 3 [W]. It is expected that the power consumption of about 1 [W] or more will be reduced by setting the surroundings to a temporary stop state at an appropriate frequency. Therefore, it is possible to extend the continuous projection time when the battery 55 is used as a power source by about 2 to 3 [%].
In this way, it becomes possible to efficiently use the power supply while suppressing the consumption of power as much as possible.

  4 and FIG. 5 may be executed only when the AC power source 56 is not connected and the battery 55 having a limited capacity is used as the power source. As a result, as described above, the continuous projection time when the battery 55 is used as a power source can be reliably extended slightly, but the power source of the data projector device 2 is exhausted, for example, immediately before the end of the presentation. It is possible to increase the possibility of avoiding the situation such as.

(Second Embodiment)
A second embodiment in which the projection system according to the present invention is applied to a projection system using a personal computer and a DLP (registered trademark) data projector will be described below with reference to the drawings.

  The appearance and connection configuration of the entire system are basically the same as in FIG. 1, the configuration of the personal computer is the same as in FIG. 2, and the functional configuration of the electronic circuit included in the data projector apparatus is basically the same as in FIG. The same parts are denoted by the same reference numerals, and illustration and description thereof will be omitted.

  In this embodiment, it is assumed that the input buffer 33 can hold image data for at least two frames. That is, it has a first area for storing image data used for the projection operation and a second area for holding the latest input image data.

Next, the operation of the above embodiment will be described.
FIG. 6 shows a data projector apparatus in the case where the personal computer 1 outputs an analog image signal and the data projector apparatus 2 inputs the image signal via the cable 3 and performs projection according to the input image signal. The basic processing contents for the image signal on the side are shown.

  This process is executed under the control of the CPU 47 for the image signal input by the input / output interface 32 via the input / output connector unit 31.

  Initially, one frame of the image signal from the personal computer 1 is input via the cable 3 (step R201), and the input image signal is digitized by the A / D converter 32a (step R202).

  Then, the obtained digital image data is held in the second area of the input buffer 33 (step R203).

  The image data held in the second area of the input buffer 33 and the projected image data already held in the first area of the input buffer 33 are read and compared (step R204).

  From the comparison result, it is determined whether there is a change between the two image data, that is, whether there is a change in the input image data itself (step R205).

If it is determined that there is a change between the two image data, the image data held in the second area is transferred to the first area again, and the transferred image data is converted into an image conversion unit. The image is converted into a format suitable for projection at 34, and a corresponding light image is formed by the micromirror element 37 by the projection image processing unit 35, and is projected onto the screen SC to be projected from the projection lens unit 43 (step R206). Thereafter, the processing returns to step R201 so as to correspond to the image signal of the next frame.

  When it is determined in step R205 that there is no change between the two image data held in the first area and the second area of the input buffer 33, the image signal from the personal computer 1 is at least immediately before. The A / D converter 32a is temporarily stopped and the power consumption in the A / D converter 32a is suppressed (step R207).

  In this case, the value of a counter (referred to as “cnt” in the figure) that counts the number of projections of the same image data is set to n (n is an integer of 2 or more) (step R208), and the input buffer 33 The image data held in one area is read again, the image conversion unit 34 converts the image data into a format suitable for projection, the projection image processing unit 35 forms a corresponding optical image with the micromirror element 37, and the projection lens unit. Projection is performed on the screen SC to be projected from 43 (step R209).

  Thereafter, after updating the counter value by “−1” (step R210), it is determined whether the updated counter value has become “0 (zero)” (step R211).

  If it is determined that the counter value is not “0 (zero)”, the process returns to step R209 again, and projection using the image data held in the first area of the input buffer 33 is performed even in the next frame. Let it run.

  In this way, the processing of steps R209 to R211 is repeatedly performed n times, and the projection operation with the same image data is performed while the A / D conversion unit 32a is stopped, and then the value of the counter is “0 (zero)”. If it is determined, the process returns to step R201 so as to correspond to the input of the image signal of the next frame again.

The number n of frames in which similar image data projection is repeated by the counter may be an integer of 2 or more as described above, and can be arbitrarily set by the user.
For example, if the time lag that does not make the user feel uncomfortable is about 0.5 seconds and the frame rate is 30 [frames / second], setting the number of frames n to “15” will change the contents. When no image signal is input, the operation of the A / D converter 32a can be temporarily stopped in units of at least 15 frames.

  In addition, especially when the personal computer 1 outputs an image signal based on a presentation program frequently used in this type of system, unlike general moving image data, an image signal whose content does not change is several seconds. It seems that it will continue to be output on the order of several minutes.

  Therefore, for example, when an image signal having no change in content is input by setting “60” to the number of frames n so as to correspond to 2 seconds in time, an A / D conversion unit in units of at least 15 frames The operation of 32a can be temporarily stopped.

  Thus, by setting the value of the number of frames n large, the degree to which the A / D conversion unit 32a is temporarily stopped is increased, the power consumption is suppressed as much as possible, and the power supply is efficiently utilized. Is possible.

As described above, according to the present embodiment, the output of the image signal on the personal computer 1 side is not subjected to any control, and the data projector device 2 on the input side independently determines whether the image signal has changed. Thus, the operation of the A / D converter 32a is executed only when necessary, and when it is determined that it is unnecessary, it is temporarily stopped.
Thereby, it is possible to efficiently use the power supply by suppressing the power consumption as much as possible on the projection apparatus side without restricting the apparatus side that outputs the image.

  In the second embodiment, after the A / D conversion is temporarily stopped in step R207 in accordance with the change of the input image signal, it is determined again whether or not the image signal has changed. The period until the counter value N as the number of frames from which the image data stored in the input buffer 33 is read becomes 0. However, the present invention is not limited to this. When the D conversion is stopped, it may be determined whether there is a change in the image signal every predetermined time.

  In the first and second embodiments, a personal computer has been described as an example of an apparatus that outputs image data. However, the present invention is not limited to this, and an analog image signal is output. As long as it is an apparatus, it can be similarly realized with a digital camera, a movie camera, a mobile phone terminal or the like having a video output function.

  In the first and second embodiments, the case where a DLP data projector apparatus is used as the projection apparatus has been described. However, the present invention does not limit elements or the like that form a light image in the projection apparatus. In addition, a liquid crystal projector using a transmissive color liquid crystal panel instead of the micromirror element 16, and each LED group of RGB serving as a light source emits light in a time-sharing manner according to color components, so that color light is emitted from a monochrome liquid crystal panel. The present invention can be similarly applied to other projection apparatuses such as a field sequential projector apparatus that forms and projects an image.

  In addition, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention in the implementation stage. In addition, the functions executed in the above-described embodiments may be implemented in appropriate combination as much as possible. The above-described embodiment includes various stages, and various inventions can be extracted by an appropriate combination according to a plurality of disclosed structural requirements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the effect is obtained, a configuration from which the constituent requirements are deleted can be extracted as an invention.

The figure which shows the connection structure of the projection system which concerns on the 1st Embodiment of this invention. FIG. 2 is an exemplary block diagram showing a configuration of an electronic circuit of the personal computer according to the embodiment. 2 is an exemplary block diagram showing a functional configuration of an electronic circuit of the data projector apparatus according to the embodiment. FIG. 7 is a flowchart showing the processing contents when outputting an image signal on the personal computer side according to the embodiment. 7 is a flowchart showing the processing contents during a projection operation on the data projector apparatus side according to the embodiment. 10 is a flowchart showing processing contents during a projection operation on the data projector apparatus side according to the second embodiment of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Personal computer, 2 ... Data projector apparatus, 3 ... Cable, 11 ... CPU, 12 ... North bridge, 13 ... Main memory, 14 ... Graphic controller, 15 ... Graphic memory, 16 ... South bridge, 17 ... PCI bus, 18 ... Keyboard / mouse, 19 ... Video encoder, 20 ... Wireless LAN interface (I / F), 21 ... Multi-disk drive, 22 ... Hard disk device (HDD), 23 ... Wireless LAN antenna, 31 ... Input / output connector, 32 ... Input / output interface (I / F), 33 ... input buffer, 34 ... image conversion unit, 35 ... projection image processing unit, 36 ... video RAM, 37 ... micromirror element (SOM), 38 ... reflector, 39 ... light source lamp, 40 ... color wheel, 41 ... integrator, DESCRIPTION OF SYMBOLS 2 ... Mirror, 43 ... Projection lens unit, 44 ... Stepping motor (M), 45 ... Motor (M), 46 ... Projection light processing part, 47 ... CPU, 48 ... Main memory, 49 ... Program memory, 50 ... Operation part , 51 ... Indicator section, 52 ... Audio processing section, 53 ... Power supply processing section, 54 ... Speaker section, 55 ... Battery, 56 ... AC power supply, AGP ... Graphics interface, FSB ... Front side bus, MB ... Memory bus, PA ... Projection range, SB ... system bus, SC ... screen.

Claims (7)

Image output means to output an analog image signal,
Determination hand stage determines the presence or absence of change of content of the image signal output by the image output means,
Output control means to control the output of the RGB image data and synchronization signals sac Chi said synchronization signal included in the analog image signal by the image output means according to the determination result in the determination means,
An image output device comprising:
Image input means for inputting an analog image signal;
A / D conversion means for converting an analog image signal input from the image input means into digital image data;
Image storage means for storing digital image data obtained by the A / D conversion means;
Projection means for projecting a light image based on the image data stored in the image storage means;
Judgment means for judging the presence or absence of a synchronization signal controlled by the output control means among the analog image signals inputted by the image input means; and
A / D conversion control means for stopping the operation of the A / D conversion means according to the judgment result of the judgment means
A projection device with
A projection system characterized by comprising: The output control means, when the determination means determines that there is no change in the content of the image signal output by the image output means, the RGB image data and the synchronization signal included in the analog image signal at the image output means. the projection system of claim 1, wherein the controller controls so as to stop the output of the Hare Chi said synchronization signal. If there is no input of the RGB image data and synchronization signals sac Chi said synchronizing signal contained in the image signals above SL analogue, said determination means, when there is no change of the analog image signals input from the image input unit determination, and the a / D conversion control means, the projection system of claim 1 or 2, wherein the stopping the operation of the a / D converter. When the operation of the A / D conversion means is stopped by the A / D conversion control means, the projection means is the image data stored in the image storage means before the operation of the A / D conversion means is stopped. 4. The projection system according to claim 1, wherein the image data is read and projected. When the operation of the A / D conversion means is stopped by the A / D conversion control means, the projection means is the image data stored in the image storage means before the operation of the A / D conversion means is stopped. 5. The projection system according to claim 4, wherein image data is read and projected n times (n is an integer of 2 or more). When the determination means determines that there is the synchronization signal controlled by the output control means, the A / D conversion control means does not stop the operation of the A / D conversion means, and the projection means Accordingly, since by projecting the image data stored in said image storage means is read, the determination means, the projection system according to any one of claims 1 to 5, characterized in that to determine the presence or absence of the synchronizing signal again. A power supply unit that selects one of a plurality of systems including a battery and supplies operating power to each unit included in the apparatus;
The A / D conversion control means, according to claim 1, characterized in that stops the operation of the A / D converting means in accordance with the determination result in the determination means in a state that selects the cell with the power source means 7. The projection system according to any one of 6 to 6 .

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