JP4066327B2 - Projection display apparatus and method, recording medium, and program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a projection display device and method, a recording medium, and a program, and in particular, can prevent an afterimage of an image displayed by the projection display device, further reduce power consumption, and reduce the size and weight. The present invention relates to a projection display apparatus and method, a recording medium, and a program.
[0002]
[Prior art]
An image projection projector (projection display device) that projects an image uses, as a light source, an Xe (hereinafter referred to as xenon) lamp, a metal halide lamp, a UHP (high pressure mercury lamp), a halogen light bulb, or the like. Since the light source is continuously turned on by alternating current or direct current, power of about 50 W to 300 W is consumed depending on the required light output.
[0003]
[Problems to be solved by the invention]
For this reason, the light source driving circuit (inverter) for driving the light source becomes very large, resulting in a problem that the entire apparatus is enlarged.
[0004]
In addition, in a projection type video projector using a field holding device such as a liquid crystal, there is a problem that an afterimage is generated when a moving image is reproduced by switching display images.
[0005]
The present invention has been made in view of such a situation, and prevents an afterimage of a displayed image, further reduces power consumption, and enables reduction in size and weight.
[0006]
[Means for Solving the Problems]
The projection display device of the present invention emits light for projecting to a field holding type display means for displaying an image and the display means. Consists of xenon flash lamps The light emission means and a timing control means for controlling the timing of light emission by the light emission means. The timing control means controls the light emission means in synchronization with the display of a predetermined unit by the display means, and flashes light emission. The light emitting means is detachable from the projection display device. It is characterized by that.
[0007]
The timing control means synchronizes the timing of light emission by the light emitting means in units of a field of the video signal, and when the display means finishes displaying the video of one field, before the video of the next field is displayed. The light emitting means can be controlled to emit light.
[0010]
A plurality of light emitting means are provided, and the timing control means can control the timing of the plurality of light emitting means.
[0011]
The timing control means can control the light emission timings of the plurality of light emission means to the same timing.
[0012]
The timing control means can control the timing of light emission by the plurality of light emitting means to different timings.
[0013]
The projection display method of the present invention includes a timing control step of controlling the light emission timing of the light emitting unit so that the light emitting unit blinks in synchronization with display of a predetermined unit on the display unit. .
[0014]
The program recorded on the recording medium of the present invention includes a timing control step for controlling the light emission timing of the light emitting unit so that the light emitting unit blinks in synchronization with display of a predetermined unit on the display unit. It is characterized by.
[0015]
The program of the present invention causes a computer to execute a process including a timing control step for controlling the light emission timing of the light emitting unit so that the light emitting unit blinks and emits light in synchronization with display of a predetermined unit on the display unit. Features.
[0016]
In the projection display apparatus and method, the recording medium, and the program of the present invention, the light emission timing is controlled so as to flash and emit light in synchronization with a predetermined unit of display.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, a xenon flash lamp is used as a light source of a projection system (projection display device).
[0018]
Empirically, the xenon flash lamp is caused to emit light to obtain, for example, a light amount equivalent to a 100 W halogen bulb (a halogen bulb is normally used as a projector (projection system) having a power of about 100 W). For this purpose, energy consumption of about 1 J (joule) is required. The power consumption of strobe light emission is defined by the energy (J) consumed by one lighting (Flash), and the unit is J / F (Joule / Flash).
[0019]
For this reason, when a 0.02 (J / F) strobe is used as the xenon flash lamp, the amount of light corresponding to a halogen light bulb of about 2 W can be obtained by lighting the xenon flash lamp once (per 1J). Since it is 100 W, 0.02J is 2 W). Therefore, in order to obtain a light amount corresponding to a halogen lamp of 100 W with a 0.02 (J / F) xenon flash lamp, it is necessary to blink about 50 times per second.
[0020]
On the other hand, in order to blink a 0.02 (J / F) xenon flash lamp about 60 times per second, generally, 12 to 24 W of electric power is required. That is, the xenon flash lamp can obtain a light amount equivalent to the halogen bulb 100W with power consumption of 12 to 24W. Assuming that the power consumption of the xenon flash lamp is 20 W, it is possible to emit the same amount of light as the halogen light bulb with the power consumption of 1/5 of the halogen light bulb (20 W / 100 W = 1/5). Means that. Hereinafter, a projection system using a xenon flash lamp will be described.
[0021]
FIG. 1 is a diagram showing a principle configuration example of a projection system (projection display device) 1 to which the present invention is applied.
[0022]
The projection system 1 is provided with a high brightness illumination unit 2, a display panel element 3, a projection lens 5, and a signal processing block 7.
[0023]
The high-intensity illumination unit 2 uses a xenon (Xe) flash lamp as a light source (a light source 87 in FIG. 5 described later) and emits light.
[0024]
When the video signal is input to the signal processing block 7, the signal processing block 7 generates a panel drive signal from the video signal and supplies it to the display panel element 3. The high-intensity illumination unit 2 emits illumination light at a predetermined timing, and irradiates the display panel element 3 with illumination light.
[0025]
The display panel element 3 projects the display image 4 displayed on the display panel element 3 onto the screen 21 as the projection image 30 via the projection lens 5 at the timing when the illumination light is irradiated.
[0026]
When the distance from the projection lens 5 to the display panel element 3 is a, the distance from the projection lens 5 to the projection image 30 (screen 21) is b, and the focal length of the projection lens 5 is f, Expression (1) is established. To do.
(1 / a) + (1 / b) = (1 / f) (1)
[0027]
Next, a specific configuration example of the projection system 1 will be described with reference to FIG.
[0028]
In addition to the configuration of FIG. 1 described above, the projection system 1 further includes a power source / light source drive block 40, an input unit 41, a battery 42, and a recording unit 43.
[0029]
The input unit 41 receives a command from the user and transfers the command to the inside of the projection system 1 (the signal processing block 7 and the power source / light source driving block 40). The battery 42 supplies necessary power to the power source / light source driving block 40. The recording unit 43 records data such as a video signal corresponding to the video to be projected, reads the video signal based on a command from the input unit 41, and supplies the video signal to the signal processing block 7. The signal processing block 7 supplies various signals to the power source / light source driving block 40 and also supplies panel driving signals to the display panel element 3.
[0030]
The power source / light source drive block 40 controls the operation of the high brightness illumination unit 2 based on a signal from the signal processing block 7 (a signal such as a vertical timing pulse described later). The high-intensity illumination unit 2 emits illumination light at a predetermined timing, enters the display panel element 3, and displays an image displayed thereon on the screen 21 as a projection image 30 via the projection lens 5. .
[0031]
FIG. 3 is a flowchart for explaining video projection processing in the projection system 1 of FIG. This process is started when the user inputs a command to project an image to the input unit 41.
[0032]
In step S <b> 1, the signal processing block 7 acquires a video signal recorded in the recording unit 41 based on a command input to the input unit 41 by the user.
[0033]
In step S <b> 2, the signal processing block 7 generates a panel drive signal based on the input video signal and supplies it to the display panel element 3. The display panel element 3 displays an image based on the transmitted panel drive signal. At this time, the signal processing block 7 generates a vertical timing pulse (vertical synchronization pulse) synchronized with the vertical blanking interval of each field from the video signal and supplies it to the power source / light source drive block 40.
[0034]
In step S3, the power source / light source drive block 40 synchronizes with the video signal based on the vertical timing pulse supplied from the signal processing block 7, and discharges at a predetermined timing synchronized with each field (or frame). The high-intensity lighting unit 2 emits light.
[0035]
In step S <b> 4, the projection system 1 displays the image displayed on the display panel element 3 as the projection image 30 through the projection lens 5 at the timing when the high luminance illumination unit 2 emits light in the process of step S <b> 3. Projection display.
[0036]
3, the power source / light source drive block 40 synchronizes with the vertical synchronization pulse included in the video signal and causes the high-intensity illumination unit 2 to emit light. ), The projected image 30 is displayed.
[0037]
Next, with reference to FIG. 4, the structure of the detachable part of the projection system 1 in FIG. 2 will be described.
[0038]
The high-intensity illumination unit 2 of the projection system 1 is detachable from the main body 31, as shown in FIG. When mounted on the main body 31, the high-intensity lighting unit 2 is electrically connected to the power source / light source driving block 40 via the contact 51. A signal connection 50 for supplying a panel drive signal from the signal processing block 7 to the display panel element 3 is arranged so as to avoid the concave portion 31A of the main body 31 to which the high luminance illumination unit 2 is mounted. Thereby, the high-intensity lighting unit 2 can be attached and detached in the directions indicated by the arrows 61 and 62.
[0039]
FIG. 5 is a block diagram showing a detailed configuration of the signal processing block 7 and the power / light source driving block 40 of the projection system 1 of FIG.
[0040]
The signal processing block 7 includes a synchronization separation unit 121, a vertical drive timing generation unit 122, a timing circuit 123, a video signal processing unit 124, and a panel drive controller 125.
[0041]
The sync separator 121 receives the video signal from the recording unit 43 and separates the sync signals (vertical sync signal and horizontal sync signal) included therein. The separated synchronization signal is supplied to the vertical drive timing generation unit 122. Further, the synchronization separation unit 121 supplies the video signal to the video signal processing unit 124. The vertical drive timing generation unit 122 generates a vertical timing pulse in synchronization with the input synchronization signal and supplies the vertical timing pulse to the timing circuit 123. When the processing signal is an NTSC video signal, the vertical timing pulse has a 1/60 second period (field period), for example.
[0042]
The timing circuit 123 supplies a control pulse to the charging switch 101 of the power / light source driving block 40 at a predetermined timing in synchronization with the vertical timing pulse, and also supplies a predetermined pulse to the trigger switch 103 of the power / light source driving block 40. Control pulses are supplied at the timing. Further, the video signal processing unit 124 executes video signal processing for each field in synchronization with the vertical timing pulse, and supplies the processed video signal to the panel drive controller 125 together with the synchronization pulse.
[0043]
The panel drive controller 125 generates a panel drive signal based on the input field unit video signal and supplies the panel drive signal to the display panel element 3 through the flexible cable 141. At this time, horizontal and vertical addressing is performed in synchronization with the vertical timing pulse, and the display contents are rewritten at a period of 1/60 seconds. The flexible cable 141 plays the same role as the signal connection 50 shown in FIG.
[0044]
The power source / light source driving block 40 includes a DC-DC converter 100, a charging switch 101, and a strobe driving circuit 102. The DC-DC converter 100 converts the DC voltage supplied from the battery 42 into a higher DC voltage and outputs it. In this example, the DC-DC converter 100 outputs a DC voltage, but a DC high voltage may be output by an AC-DC converter (not shown).
[0045]
The charging switch 101 is switched on or off based on the control pulse supplied from the timing circuit 123 of the signal processing block 7. When the charging switch 101 is turned on, the charging switch 101 receives the DC high voltage supplied from the DC-DC converter 100. This is supplied to the strobe driving circuit 102 and charged in a built-in capacitor (a capacitor 163 in FIG. 9 described later).
[0046]
The strobe driving circuit 102 supplies the discharge current from the built-in capacitor (capacitor 163) to the light source 87 via the contact 88 of the high-intensity lighting unit 2. The trigger switch 103 built in the strobe driving circuit 102 is turned on or off based on the pulse supplied from the timing circuit 123, and outputs a trigger signal to the light source 87 via the contact 88.
[0047]
Based on the trigger signal from the trigger switch 103, the light source 87 emits light with a discharge current from the capacitor 163 built in the strobe driving circuit 102.
[0048]
This discharge light emission is performed in synchronization with the vertical timing pulse when an image for one field is displayed on the display panel element 3 (when scanning from the first line to the last line of one field is completed). It is. The light emission ends until the next field image is displayed (scanning of the first line of the next field is started).
[0049]
Next, timing control between the signal processing block 7 and the power / light source driving block 40 will be described with reference to the flowcharts of FIGS. 6 and 7.
[0050]
First, the signal processing in the signal processing block 7 of FIG. 5 will be described with reference to FIG. This process is started when the user instructs the input unit 41 to display an image.
[0051]
In step S21, the signal processing block 7 receives an input corresponding to a command input to the input unit 41 by the user. For example, when the user operates the input unit 41 to instruct playback of a predetermined video file recorded in the recording unit 43, this is accepted.
[0052]
In step S22, the signal processing block 7 reads out the video file instructed by the user (the video file instructed by the user in the process of step S21) from the recording unit 43, and acquires the video signal.
[0053]
In step S23, the synchronization separation unit 121 separates the synchronization signal from the video signal acquired by the process in step S22. The synchronization separation unit 121 supplies the separated synchronization signal to the vertical drive timing generation unit 122. Further, the synchronization separation unit 121 supplies the video signal to the video signal processing unit 124.
[0054]
In step S24, the vertical drive timing generation unit 122 generates a vertical timing pulse in synchronization with the synchronization signal (vertical synchronization signal and horizontal synchronization signal) separated in the process of step S23. For example, if the acquired video signal (the video signal acquired by the processing in step S22) is composed of 60 fields per second, a pulse synchronized with the vertical synchronization signal is generated at a 1/60 second period. .
[0055]
In step S <b> 25, the vertical drive timing generation unit 122 supplies the generated vertical timing pulse to the timing circuit 123 and the video signal processing unit 124.
[0056]
In step S <b> 26, the timing circuit 123 generates a control pulse at a predetermined timing in synchronization with the input vertical timing pulse, and outputs the control pulse to the power source / light source driving block 40. Specifically, the timing circuit 123 outputs a control pulse for controlling the charging switch 101 of the power / light source driving block 40 and a control pulse for controlling the trigger switch 103 of the power / light source driving block 40. These control pulses will be described later with reference to FIG.
[0057]
In step S27, the video signal processing unit 124 processes the input video signal so as to be suitable for display on the display panel element 3, and supplies the processed video signal and the vertical timing pulse to the panel drive controller 125. . The panel drive controller 125 converts the video signal into a panel drive signal in synchronization with the vertical timing pulse, and supplies the panel drive signal to the display panel element 3 via the flexible cable 141. In this example, the display contents of each field are rewritten at a 1/60 second period.
[0058]
Next, the light emission processing in the power source / light source drive block 40 will be described with reference to FIGS. 7 is started when the user instructs the input unit 41 to display an image.
[0059]
In step S <b> 41, the DC-DC converter 100 converts the DC voltage supplied from the battery 42 into a DC voltage Vb (FIG. 8A) that is high enough to cause the light source 87 to emit light, and outputs it to the charging switch 101.
[0060]
In step S42, the charging switch 101 is turned on / off in synchronization with the control pulse (FIG. 8B) transmitted from the timing circuit 123 of the signal processing block 7 by the process of step S25 of FIG. 6, and the process of step S41 is performed. The DC voltage Vb (FIG. 8A) output by is output as shown in FIG. 8C. 8A to 8D and 8F, the vertical axis represents voltage V, and the horizontal axis represents time t. In FIG. 8E, the vertical axis represents current I, and the horizontal axis represents time t.
[0061]
Specifically, during a time T41 from time t1 to time t4 in FIG. 8B, the signal is turned off when a high level control pulse is input, and other times, for example, low times indicated from time t4 to time t5. On for the duration of the level. As a result, as shown in FIG. 8C, the voltage Vb (FIG. 8A) output from the DC-DC converter 100 is supplied to the strobe drive circuit 102 and charges the built-in capacitor (capacitor 163 in FIG. 9). As a result, the charging voltage of the capacitor 163 rises as shown in FIG. 8C, and the charging voltage of the capacitor 164 rises as shown in FIG. 8F.
[0062]
The time T41 has a length of about 3H (63.55 (μ seconds) × 3), for example, and the time T42 has a field period (a period of a vertical timing pulse (for example, 1/60 second)).
[0063]
The voltage (FIG. 8A) supplied from the timing circuit 123 to the charging switch 101 is supplied to the strobe driving circuit 102 as power necessary for discharge light emission during a charging time (for example, a time from time t4 to time t5). The At time t5, the charging switch 101 is turned off, but the charging voltage is stored in the capacitor 163. Therefore, even if the switch is turned off and no power is supplied from the DC-DC converter 100, the voltage is At T43, the voltage Vb remains unchanged.
[0064]
Returning to FIG. 7, in step S43, the timing circuit 123 determines that the positive polarity is high from time t6 to time t7 when a very short time T43 (for example, 60 μsec) from time t5 to time t6 has elapsed. A trigger pulse (FIG. 8D) of level (about TTL level) is output.
[0065]
The trigger switch 103 is turned on (when it is at a high level in FIG. 8D) or off (when it is at a low level in FIG. 8) based on a trigger pulse (FIG. 8D). The power charged in the capacitor (capacitor 163) (power charged during the period from time t4 to time t5 as shown in FIG. 8C) is supplied to the light source 87 when the trigger switch 103 is turned on at time t6. Is done. FIG. 8E shows a current waveform that flows as a discharge current in the light source 87, which causes the light source 87 to emit light.
[0066]
6 and FIG. 7, the timing circuit 123 of the signal processing block 7 supplies the control pulse in synchronization with the vertical timing pulse synchronized with the synchronizing signal of the video signal, and the power source / light source driving block 40. However, by emitting discharge light based on the control pulse, the light source flashes in synchronization with the field period. For this reason, it is possible to prevent the images of different fields from being displayed as afterimages as the same image as in the case of continuous light emission.
[0067]
9 is a diagram illustrating a specific configuration example of the power source / light source driving block 40, and FIG. 10 is a diagram illustrating a correspondence relationship between the configuration example of FIG. 9 and the configuration of FIG.
[0068]
9 and 10, the power source / light source drive block 40 includes the DC-DC converter 100, the switch 101, the capacitor 163, the capacitor 164, the trigger switch 165, the resistor 166, and the trigger transformer 167. The DC-DC converter 100 is connected to the battery 42, and the strobe driving circuit 102 is connected to a discharge tube (xenon flash lamp) 168 as a light source 87.
[0069]
The capacitor 163 accumulates (charges) the electrical energy for discharge supplied from the DC-DC converter 100 at a high speed when the charging switch 101 is turned on. A series circuit of the resistor 166 and the capacitor 164 is connected in parallel with the capacitor 163. The capacitor 164 is a capacitor for storing the electrical energy for generating the trigger signal supplied from the DC-DC converter 100, and the resistor 166 is an excessive voltage to the capacitor for storing the electrical energy for generating the trigger signal. The resistor 166 × capacitor 164 constitutes a time constant circuit.
[0070]
The trigger transformer 167 is an autotransformer having a large winding ratio between the primary winding 167a and the secondary winding 167b. One end of the primary winding 167a is connected to a connection point between the resistor 166 and the capacitor 164, and the other end is connected to one contact of the trigger switch 103 together with one end of the secondary winding 167b. The other contact of the trigger switch 103 is grounded. The other end of the secondary winding 167b is connected to the control electrode 168C of the discharge tube 168.
[0071]
The terminal voltage of the capacitor 164 is charged based on the time corresponding to the time constant with the resistor 166. The time constant is set so that the value becomes a potential sufficient to obtain the voltage necessary for the trigger within time T45 (the optimum time (time constant) varies depending on the turn ratio and the light source used). ). When the trigger switch 103 is turned on based on an external trigger signal (FIG. 8D) (turned on for a time T44), the discharge current of the capacitor 164 shown in FIG. It flows through the primary coil 167a and the trigger switch 103. At this time, the terminal voltage of the capacitor 164 is applied to the primary winding 167a, and a high voltage pulse generated by the counter electromotive force is generated in the secondary winding 167b of the trigger transformer and applied to the control electrode 168C.
[0072]
When a high voltage is applied to the control electrode 168C, the discharge tube 168 ionizes the xenon gas present therein, thereby causing dielectric breakdown. For this reason, the electric power charged in the capacitor 163 flows through the discharge tube as the discharge current IL (with the same waveform as in FIG. 8E) and emits flashing light (time t2, time t6, or time t10 in FIG. 8). Since the electrical energy stored in the capacitor 163 is consumed instantaneously, the terminal voltage of the capacitor 163 immediately becomes 0 (FIG. 8F). Thereafter, charging switch 162 is turned on again (turned on at time t4 in FIG. 8B), and capacitor 163 is charged. By repeating such a cycle, the discharge tube blinks in the field period.
[0073]
Next, the high-intensity illumination unit 2 will be described with reference to FIGS. 11 and 12.
[0074]
FIG. 11 is a front view (FIG. 11A) and a side view (FIG. 11B) of the high-intensity lighting unit 2. The light source 87 is a xenon flash lamp, and the light emitted from the light source 87 is collected by the condenser mirror 281, diffused by the diffusion plate 280, and irradiated to the display panel element 3.
[0075]
FIG. 12 is a perspective view of the high-intensity lighting unit 2. In the figure, portions corresponding to those in FIG. 11 are denoted by the same reference numerals, and the description thereof will be omitted because it will be repeated.
[0076]
A contact 51 is provided on the upper part of the high-intensity illumination unit 2 and is electrically connected to the power source / light source drive block 40 via the contact 51 as shown in FIG. As described above, the high-intensity lighting unit 2 can be attached to and detached from the main body 31.
[0077]
As described above, by using the xenon flash lamp as a light source, power consumption can be reduced, and further, by replacing the xenon flash lamp with a detachable structure, the light source can be easily replaced.
[0078]
Next, another example of the projection system 1 to which the present invention is applied will be described with reference to FIG. FIG. 13 is a diagram for explaining an example of the color separation prism portion of the imaging unit of a three-plate CCD (Charge Coupled Device) camera.
[0079]
In FIG. 13, the white light emitted from the high-intensity lighting units 2R, 2G, and 2B is extracted by the red filter 373, the green filter 393, or the blue filter 413, and red, green, or blue components are extracted, respectively. The panel elements (transmission type panel display elements (physical display elements that are not physically attached with exactly the same color filter, for example, liquid crystal panels)) 3R, 3G, 3B are irradiated. The display panel elements 3R, 3G, and 3B emit respective incident red, green, or blue light components. The red, green, and blue component light that has passed through the display panel element 3 passes through the red color separation prism 372, the green color separation prism 392, and the blue color separation prism 412, respectively. These are combined (here, these prisms function to synthesize light of each color), become white light rays, and enter the projection lens 1. By synchronizing the light emission timings of these three high-intensity lighting units 2 (for example, as shown in FIG. 14, the light emission is flashed simultaneously at a period of 1/60 seconds), the light amount can be increased three times. And a brighter projected image 30 can be obtained.
[0080]
That is, in the example of FIG. 14, the light emission timing of white light (FIG. 14A) is the same time as the light emission timing of the red component (FIG. 14B), the green component (FIG. 14C), and the blue component (FIG. 14D). . All the three high-intensity lighting units 2 are blinking at the same timing (for example, 1/60 second period (field period)).
[0081]
Thus, by providing the three high-luminance illumination units 2R, 2G, and 2B, the luminance can be increased three times. In this example, three high-intensity lighting units 2R, 2G, and 2B are provided. However, the number of high-intensity lighting units 2 is not limited to three, and a plurality of high-intensity lighting units 2 are provided. The light emission timing may be synchronized.
[0082]
Next, another example of the projection system 1 to which the present invention is applied will be described with reference to FIG.
[0083]
In the example of FIG. 15, the display panel element (single plate display element with a color filter) 460, the prism 470, the high brightness illumination unit 471, the prism 480, the high brightness illumination unit 481, the prism 490, and the high brightness illumination unit 491 Is provided. Further, a projection lens 1 is further provided.
[0084]
In this example, as shown in FIG. 16, the high-intensity illumination unit 471 emits light at the timing shown in FIG. 16B, the high-intensity illumination unit 481 emits light at the timing shown in FIG. 16C, and the high-intensity illumination unit 491 16D emits light at a period corresponding to FIG. 16D, and the projection lens 5 (display panel element 460) emits light at the timing shown in FIG. 16A.
[0085]
The high-intensity lighting unit 471 (FIG. 16B), the high-intensity lighting unit 481 (FIG. 16C), and the high-intensity lighting unit 491 (FIG. 16D) shown in FIG. By emitting light sequentially shifted by a period, one high-intensity lighting unit (for example, high-intensity lighting unit 471) can emit light of a normal high-intensity lighting unit as a 1/60 second period (field period). Light may be emitted in a cycle of 60 seconds (field cycle) (actually, the light projected on the projection lens 5 is shown in FIG. 16A). As a result, the life of the light source 87 can be approximately tripled.
[0086]
In this example, three high-intensity illumination units (high-intensity illumination unit 471, high-intensity illumination unit 481, and high-intensity illumination unit 491) are provided. A high-intensity lighting unit may be provided.
[0087]
It is also possible to photograph a subject using the projection system 1 shown in FIG.
[0088]
FIG. 17 is a diagram illustrating a configuration when the projection system 1 of FIG. 1 is used as a camera.
[0089]
In the camera 522 of FIG. 17, an image sensor 521 is provided instead of the high-intensity lighting unit 2, whereby an image of the subject 501 is captured via the photographing lens 511 and captured as an image 520 on the image sensor 521. The image sensor 521 converts the image 520 into an electric signal and supplies the electric signal to the signal processing block 523. The signal processing block 523 processes the electrical signal and outputs it as an image signal (for example, output to a recording unit (not shown) for recording).
[0090]
17, the imaging lens 511 and the signal processing block 523 are also used as the projection lens 5 and the signal processing block 7 in FIG. 1, respectively, and the camera 522 is switched by switching between the imaging element 521 and the high-intensity illumination unit 2 in FIG. And the projection system 1 can be used, and a simple and inexpensive system can be constructed.
[0091]
Also, in the structure shown in FIG. 13 and FIG. 15, as shown in FIG. 18, a red image sensor (CCD) 371, a green image sensor 391, and a blue image sensor 411 are provided, and red color separation is performed. By combining the prism 372, the green color separation prism 392, and the blue color separation prism 412 with the color separation prism of the projection system 1 shown in FIG. 13, an image sensor (red image sensor (CCD) 371) is obtained. The camera 522 and the projection system 1 can be used together simply by switching between the green image sensor 391 and the blue image sensor 411) and the display panel element 3 (display panel elements 3R, 3G, 3B).
[0092]
When switching between the camera 522 and the projection system 1, for example, by providing a rotation switching mechanism 550 as shown in FIG. 19, the projection system 1 and the imaging system 552 can be easily switched.
[0093]
As described above, power consumption can be reduced by using a xenon flash lamp as a light source and synchronizing the frequency of the display field of the video signal and the timing of light emission (flashing) of the xenon flash lamp.
[0094]
Further, by suppressing power consumption, the battery can be driven, and the projection system 1 can be portable.
[0095]
Further, it can be used in combination with a camera, the system configuration can be simplified, and it can be realized at low cost.
[0096]
Further, the light source can be easily replaced by making the light source (xenon flash lamp) detachable.
[0097]
Furthermore, the luminance can be increased by providing a plurality of xenon flash lamps and synchronizing the timing of light emission.
[0098]
In addition, by providing a plurality of xenon flash lamps, shifting the phase of light emission, and reducing the number of flashes per unit time, it is possible to extend the life compared to the case of providing one xenon flash lamp.
[0099]
Furthermore, power consumption can be reduced, and the projection system can be made smaller.
[0100]
Further, even when a field holding type display device (for example, a liquid crystal device) is used for the display panel element 3, it is possible to suppress the occurrence of an afterimage.
[0101]
It should be noted that the electrode mounting position and wiring do not have to be in that position, and are not limited to the present embodiment.
[0102]
In the present specification, the step of describing a computer program includes not only processing performed in time series according to the described order but also processing executed in parallel or individually even if not necessarily processed in time series. Is also included.
[0103]
【The invention's effect】
As described above, according to the present invention, an image can be projected. In particular, it is possible to suppress the occurrence of an afterimage of the displayed image. In addition, power consumption can be reduced.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of the basic configuration of a projection system according to the present invention.
FIG. 2 is a diagram showing a specific configuration example of the projection system of FIG.
FIG. 3 is a flowchart for explaining video projection processing in the projection system of FIG. 2;
4 is a diagram showing a configuration of a detachable portion of the projection system of FIG.
5 is a block diagram showing a detailed configuration of a signal processing block and a power / light source driving block of the projection system of FIG.
6 is a flowchart illustrating signal processing in the signal processing block of FIG. 5;
7 is a flowchart illustrating light emission processing in the power / light source drive block 40 of FIG.
FIG. 8 is a timing chart illustrating timings in the light emission processing of FIG.
9 is a circuit diagram showing a configuration example of a power source / light source driving block in FIG. 5;
10 is a diagram for explaining the correspondence between FIG. 5 and FIG. 9;
FIG. 11 is a diagram illustrating a configuration example of the high-intensity illumination unit of FIG.
12 is a diagram illustrating a configuration example of the high-intensity illumination unit in FIG. 1. FIG.
FIG. 13 is a diagram showing another example of a projection system to which the present invention is applied.
14 is a timing chart for explaining the light emission timing of the high-intensity illumination unit of FIG.
FIG. 15 is a diagram showing another example of a projection system to which the present invention is applied.
16 is a timing chart for explaining light emission timing of the high-intensity illumination unit of FIG.
FIG. 17 is a diagram showing a configuration when the projection system of FIG. 1 is used as a camera.
FIG. 18 is a diagram showing a configuration when the projection system of FIGS. 13 and 15 is used as a camera.
19 is a diagram for explaining switching between the projection system of FIG. 1 and the camera of FIG. 17;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Projection system, 2 High brightness illumination unit, 3 Display panel element, 5 Projection lens, 7 Signal processing block, 40 Power supply / light source drive block

Claims (8)

In a projection display device that displays an image based on an image signal,
Field holding type display means for displaying the video;
A light emitting means constituted by a xenon flash lamp for emitting light for projection onto the display means;
Timing control means for controlling the timing of light emission by the light emitting means,
The timing control means controls the light emitting means in synchronization with the display of a predetermined unit by the display means to flash and emit light ,
The projection display device, wherein the light emitting means is detachable from the projection display device. The timing control means synchronizes the timing of light emission by the light emitting means with the field of the video signal as the unit, and when the display means finishes displaying the video of one field, the video of the next field is displayed. The projection display apparatus according to claim 1, wherein the light emitting unit is controlled to emit light before being displayed. A plurality of the light emitting means are provided,
The projection display device according to claim 1, wherein the timing control unit controls timings of the plurality of light emitting units. The projection display device according to claim 3 , wherein the timing control unit controls the timing of light emission by the plurality of light emitting units to be the same timing. The projection display device according to claim 3 , wherein the timing control unit controls the timing of light emission by the plurality of light emitting units to be different timings. Projection of a projection display device that includes a display unit that displays an image and a detachable light emitting unit that includes a xenon flash lamp that emits light projected onto the display unit and displays an image based on an image signal In the mold display method,
A projection type display method comprising: a timing control step of controlling a light emission timing of the light emitting unit so that the light emitting unit emits blinking in synchronization with display of a predetermined unit by the display unit. Controls a projection display device that has a display unit for displaying images and a detachable light emitting unit composed of a xenon flash lamp that emits light projected on the display unit and displays images based on video signals A program to
A computer-readable program comprising: a timing control step for controlling a light emission timing of the light emitting unit so that the light emitting unit flashes and emits in synchronization with display of a predetermined unit by the display unit. Recording medium on which is recorded. Controls a projection display device that has a display unit for displaying images and a detachable light emitting unit composed of a xenon flash lamp that emits light projected on the display unit and displays images based on video signals To the computer
A program for executing a process including a timing control step of controlling a light emission timing of the light emitting unit so that the light emitting unit blinks and emits light in synchronization with display of a predetermined unit by the display unit.

Images