JP2685653B2 - Image projection device for projection display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image projection apparatus and an image projection method for a projection display apparatus, and more particularly to an image projection apparatus for a projection display apparatus capable of projecting a large color image by a single monochromatic projection tube. it relates to the location.

[0002]

The direct-view Display Lee device used generally, such as the Related Art CRT are being increasingly enlarged, the volume and weight increasing rapidly in the fabrication of large-sized cathode ray tube over the current 45 inches with this size Is almost impossible.

[0003] Accordingly, a projection type display device has been developed which projects an image displayed on a CRT or the like on a large screen so that the image can be viewed from a distant place.

[0004] The simplest projection type display device has a configuration in which an image displayed on a color picture tube is projected on a screen through an optical system. Not suitable for the formation of

[0005]

In such a situation, as shown in FIG. 7, what is mainly used in the conventional projection type display device is red (R), green (G), Blue (B) three monochromatic picture tube or projection tube 35
Red, green, and blue single-color images are displayed by 2, 353, and 354, respectively, and a color image is formed by projecting the images on the screen 351 through the focusing lens 357.

However, this conventional example has a problem in that three independent projection tubes must be provided, the size and cost of the projection apparatus are increased, and it is difficult to adjust the convergence.

Further, as another example of the projection type display device, as shown in FIG. 8, three liquid crystal display devices LCD of red, green and blue for displaying monochromatic images of red, green and blue, respectively.
A liquid crystal light valve type image projection device using 1, LCD 2 and LCD 3 has also been proposed. In this device,
The white light generated from the light source LAMP is used for the mirrors M1 and M2.
And red through the spectroscopic mirrors DM1, DM2, DM3,
Liquid crystal display device L for each of the green and blue monochromatic light
Scanning the CD1, LCD2, and LCD3 with driving light to form respective monochromatic images, and projecting these monochromatic images on the screen through the mirror M3 and the spectroscopic mirrors DM3 and DM4 and the lens LE forms a color image. I have to. In the figure, reference numeral F
IL is a filter, and C1, C2, and C3 are focusing lenses of the drive tube.

In such a structure, since the projected image is formed by each liquid crystal display device, its resolution depends on the number of pixels of the liquid crystal display device. However, at present, there is a limit in increasing the number of pixels of the liquid crystal display device, so that this device is still unsuitable for high resolution.

[0009] The present invention has been made in view of these points, using only one single color projection tube, a video projection equipment of a projection display apparatus capable of displaying a large color images economically high resolution The purpose is to provide.

[0010]

In order to achieve the above-mentioned object, the image projection apparatus of the projection type display apparatus according to the present invention according to the first aspect of the present invention includes red, which is sequentially arranged in time series.
A conversion means for converting the green and blue video signals into an optical signal having a wavelength of light corresponding to each of the red, green and blue video signals for one horizontal scanning line through a monochromatic image tube, A double speed part for converting the red, green and blue video signals to n times speed according to a write / read control clock signal, a sampling frequency signal and a control signal, and a red, green and blue video signal at the double speed part. Write used for conversion /
A phase-locked loop unit that supplies a read control clock signal, a sampling frequency signal, and a control signal, and a synchronization that separately generates a synchronization signal for vertical and horizontal deflection from the red, green, and blue video signals converted by the double speed unit. Conversion means having a separation / deflection section and a display section for displaying the output of the double speed section with optical signals corresponding to red, green, and blue in accordance with the synchronization signal of the synchronous separation / deflection section; Separating means for separating the red, green, and blue monochromatic component light signals from the light signal, respectively , wherein the output of the converting means is the wavelength of the light.
Is divided into red, green, and blue component optical signals by
Optical component and component light output from the spectroscopic mirror
Separation means formed by a mirror that reflects the signal ,
Focusing means for focusing the separated red, green and blue component optical signals, wherein the separated red, green and blue monochromatic component optical signals
The opening and closing means for selectively passing through the numbers and this opening and closing means
An open / close drive unit that outputs a drive signal for driving
The red, green, and blue component optical signals that have passed through the opening and closing means are reflected and reflected.
And a converging portion that is transparent and converging
And a focusing means .

[0011]

The apparatus of the present invention according to claim 2 is the device according to claim 1.
In the double speed section, three A / D converters for inputting the red, green and blue video signals and converting them into digital signals in accordance with a predetermined sampling frequency signal, and the respective red, green and blue digital signals , A counter for receiving and counting the control signal output from the phase-locked loop unit, a counter for receiving the control signal as a clock signal and latching the output of the counter, and A D flip-flop provided as a clear signal, a switch for controlling the reading of data stored in the memory by switching according to the output state of the counter, and red, green, and blue digital signals read from the memory Of three D's for converting each of the red, green, and blue analog signals with a predetermined sampling frequency signal
It has a / A converter.

The device of the present invention according to claim 3 is the device according to claim 2
In the above, in the write / read control clock signal and the sampling frequency signal supplied from the synchronization loop section to the double speed section, the red, green and blue video signals are A / D
A write control clock signal and a sampling frequency signal for conversion in a converter and writing in the memory, and read control of the digital signal written in the memory, D
A / A converter has a read control clock signal and a sampling frequency signal for converting into an analog signal. At this time, the read control clock and the sampling frequency are set to be three times the write control clock and the sampling frequency. It is characterized by being formed.

[0014]

[0015]

The device of the present invention according to claim 4 is the device according to claim 1.
In the above, the opening / closing means is formed by a liquid crystal shutter having a single pixel.

The device of the present invention according to claim 5 is the device according to claim 1.
In the above, the open / close drive unit receives a switching signal for outputting red, green, and blue component light from the counter of the double speed unit, and outputs a drive signal for driving the open / close unit according to a logical combination value thereof. It is characterized by being formed by a logic element.

[0018]

[0019]

[0020]

[0021]

According to the image projection device of the projection type display device of the present invention described in claims 1 to 5 , it is possible to display a large color image of high resolution by using one monochromatic projection tube.

[0022]

BRIEF DESCRIPTION Exemplary embodiments of the image projection equipment of a projection display device according to the present invention for FIGS. 1-6 in detail.

FIG. 1 is a diagram showing the construction of a video projection apparatus according to the present invention.

In FIG. 1, the triple speed circuit 100 has R,
A serial connection in which the R, G, B video signals input to the G, B input terminals R, G, B are tripled in speed and sequentially arranged in time series.
To output in Thailand. The PLL circuit 200 receives a horizontal sync signal at the horizontal sync end Hsync output from a sync detection circuit (not shown) and receives a PLL (Phase Locked L).
The write / read control clock signal and the sampling frequency signal for triple-speeding the R, G, B signals of the triple speed circuit 100 are generated according to the (Oop) method. The image tube 300 receives the R, G, B analog signals output from the triple speed circuit 100 and tripled in speed, and scans at triple speed to display a monochrome image. The sync separation and deflection circuit 400 separates the sync signal from the output of the R, G, and B video signals that have been subjected to the triple speed including the composite sync signal in the triple speed circuit 100, and outputs the video signal to the picture tube 300 at the triple speed. A vertical / horizontal synchronizing signal for vertical / horizontal deflection for scanning is generated.

First to third electronic liquid crystal shutters 80, 90, 1
Reference numeral 10 is for selectively passing the component optical signals of R, G, and B single colors by an electrical control signal. The shutter driving circuit 500 decodes the switching signals for outputting the R, G, and B video signals of the triple speed circuit 100 to generate the first to third electronic liquid crystal shutters 80, 90, and 1.
A drive signal for sequentially passing the R, G, and B component optical signals in 10 is generated.

The first spectral mirror 40 has the above-mentioned image tube 30.
According to the wavelength of the light, the red component light is totally reflected at 90 ° and the blue and green component light is transmitted from the image that is monochromatically displayed on the screen of 0, and the second spectral mirror 50 is the first spectral mirror. Of the blue and green component light transmitted through 40, the green component light is totally reflected at 90 ° depending on the wavelength of the light,
The blue component light is transmitted.

The first and second mirrors 10 and 20 have the first and second mirrors, respectively.
The red and green component lights totally reflected by the two spectral mirrors 40 and 50 are respectively totally reflected at 90 ° horizontally, and the third mirror 30
Reflects the red component light reflected by the first mirror 10 output through the first electronic liquid crystal shutter 80 by the output of the shutter drive circuit 500 at 90 °.

The third spectroscopic mirror 60 totally reflects at 90 ° the green component light totally reflected by the second mirror 20 output through the second electronic liquid crystal shutter 90 according to the output of the shutter drive circuit 500 and the wavelength of the light. , The third mirror 30
The red component light totally reflected by is transmitted.

The fourth spectral mirror 70 transmits the blue component light of the second spectral mirror 50 output through the third electronic liquid crystal shutter 110 according to the output of the shutter drive circuit 500 and the wavelength of light, and transmits the red and green component light. Totally reflect at 90 °.

The lens 600 focuses the output of the fourth spectral mirror 70 and projects it on a large color screen by adjusting the magnification.

The image projection method of the present invention having such a configuration is as follows.

In the present invention, first, the R, G, B video signals including the sync signal are converted from the horizontal sync signal to a triple speed by a predetermined control signal generated by the PLL system by the configuration shown in FIG. , And sequentially arranged in chronological order
A triple speed conversion step of outputting in a serial state is performed.

A sync separation step of separating the vertical and horizontal sync signals by the 3x speed R, G, and B video signals output from the 3x speed conversion step is performed, and the R and G speeds increased by 3 times from the 3x speed conversion step. , B video signals are input in series, and are deflected by the vertical / horizontal synchronization signals output in this synchronization separation stage to display in a single color.

Next, a separating / reflecting step of selectively separating and reflecting the R, G, and B monochromatic component optical signals from the monochromatic optical signal displayed in this display step according to the wavelength of light is performed, and a triple speed is performed. R that was tripled in the conversion stage,
A selection step of sequentially passing the R, G, B component optical signals separated from the separation / reflection step by a switch signal for outputting the G, B video signals to select the R, G, B component optical signals. Is performed.

Finally, R, G, passed from the selection stage
Focusing and projecting steps are performed in which the B component optical signals are combined and projected on the screen by adjusting the focusing magnification.

FIG. 2 is a detailed circuit diagram of the triple speed circuit 100 and the shutter drive circuit 500 of FIG.
Is formed as follows.

The first to third A / D converters 121 to 123 are
The analog R, G, B video signals input through the R, G, B input terminals R, G, B are output from the PLL circuit 200 and input to the write control clock and sampling frequency terminal 202 of 8 MHz. Converted to digital data by sampling signal.

The first to third memories 141 to 143 include the first to third memories 141 to 143.
The digital data output from the 3A / D converters 121 to 123 are sequentially written by the write control clock that receives the signal output from the PLL circuit 200 and the address signal that is counted according to the input clock signal of the sampling frequency end 202. , The write control clock output from the PLL circuit 200 and a signal that is three times the sampling frequency end 202 are input from the read control clock and sampling frequency end 203, and the written data is read by the address signal counted.

The counter 144 receives and counts the control signal of the control signal terminal 201 which receives the signal output from the PLL circuit 200, and the D flip-flop 145 receives the input of the control signal terminal 201 as a clock signal, and the counter 1
The output of 44 is latched to provide a clear signal to this counter 144.

The switch 150 is switched depending on the states of the output terminals Qa and Qb of the counter 144, and the read control clock and sampling frequency terminal 203.
24 MHz clock signal of the first to third memories 141 to
It is supplied to the read clock terminal RD CK of 143 to control the outputs of these first to third memories 141 to 143.

The D / A converter 160 converts the outputs of the first to third memories 141 to 143 into analog signals according to the read control clock and the sampling signal at the sampling frequency end 203.

The output terminals Qa and Qb of the counter 144 are also provided.
Are AND gates 50 of the shutter drive circuit 500, respectively.
1, 502 and the input end of NOR gate 503, the output end 504 of one AND gate 501 is connected to the first electronic liquid crystal shutter 80 for passing red light, and the output end 505 of the other AND gate 502 passes green light. Connected to the second electronic liquid crystal shutter 90 for transmission, and the output end 506 of the NOR gate 503 is the third electronic liquid crystal shutter 110 for passing blue light.
It is connected to the.

FIG. 3 is an operation waveform diagram of the triple speed conversion of the triple speed circuit 100 of FIGS. 1 and 2 according to the present invention. FIGS. 3A to 3C show a write control clock and an 8 MHz input to the sampling frequency end 202. Data waveforms stored in the first to third memories 141 to 143 after the R, G, and B analog signals input to the first to third A / D converters 121 to 123 in FIG. 2 are converted into digital data by the sampling signal. FIG. 14D is a diagram showing a read control clock and 24M input to the sampling frequency end 203.
The first to third memories 141 shown in FIG.
4 is a data waveform diagram read from FIG.

FIG. 4 shows the PLL circuit 20 of FIG. 1 according to the present invention.
It is a detailed block diagram of 0.

In the figure, a phase comparator 204 compares the phases of the horizontal synchronizing signal at the horizontal synchronizing signal end (Hsync) and the signal fed back through the first frequency divider 207 and outputs a difference.
The low pass filter (LPF) 205 includes the phase comparator 20.
4 output is low-pass filtered and D at DC voltage level
Convert to C. The voltage controlled oscillator (VCO) 206 generates an oscillation frequency of 24 MHz according to the output level of the low pass filter 205.

The first frequency divider 207 is a voltage controlled oscillator 20.
6 output (24 MHz) to a predetermined value (24 MHz / fh)
Frequency division, [24MHz ÷ (24MHz / f
h)], a pulse width, that is, a phase, is different from the horizontal synchronizing signal Hsync, and a signal fh having the same frequency and cycle as the horizontal synchronizing signal is generated and output to the phase comparator 204.

The AND gate 208 reads the output of the voltage controlled oscillator 206, which is generated by a signal having a stable 24 MHz frequency when the voltage applied to the power source terminal Vcc connected to one terminal of the resistor R is "high". The control clock and sampling frequency terminal 203 are supplied.

The second frequency divider 209 has an AND gate 208.
Divides the 24 MHz signal output from the write control clock and the sampling frequency terminal 202 by 8 MHz.
Supply the z signal. The third frequency divider 210 is the second frequency divider 2
The 8 MHz output of 09 is divided by a predetermined value (8 MHz / 3 fh) [8 MHz ÷ (8 MHz / 3 fh)], and the frequency 3 fh, which is three times the horizontal frequency, is tripled.
Is input to the control signal terminal 201.

FIG. 5 is a control operation waveform diagram of the shutter drive circuit 500 driven by the output of the third frequency divider 210 according to the input of the horizontal synchronizing terminal Hsync of FIG.
6B is an input waveform diagram of the horizontal synchronizing end Hsync, FIG. 7B is an output waveform diagram of the third frequency divider 210, and FIGS.
Is the counter 1 according to the same clock signal as that in FIG.
Input the value counted in 44 and AND gates 501, 5
02 and NOR gate 503 output logical values from the first to third electronic liquid crystal shutters 80, 90, 110 of FIG.
It is a waveform diagram of a drive signal for driving the.

FIG. 6 is an operation diagram exemplifying the 3 × speed scanning in the picture tube 300 according to the present invention. The existing R, G, B video signals as shown in FIGS. This is an example of scanning as shown in FIG.

The specific operation of the device of the present invention will be described in detail with reference to FIGS.

Red through R, G, B input terminals R, G, B,
The green and blue analog video signals are input to the triple speed circuit 100, and the horizontal sync signal output from the sync separation circuit (not shown) has a waveform as shown in a of FIG. 5 at the horizontal sync end Hsync of the PLL circuit 200 of FIG. It is input with a signal that has.

PLL circuit 200 configured as shown in FIG.
The phase comparator 204 compares the phase of the frequency fh signal having the same frequency as the horizontal synchronizing signal frequency fed back from the first frequency divider 207 with the input signal at the horizontal synchronizing signal end Hsync. The comparison difference value generated from the phase comparator 204 is low-pass filtered by the low-pass filter 205 to be converted into DC.

D output from the low-pass filter 205
The oscillating frequency of the voltage controlled oscillator 206 is determined by the C voltage level, and locking is performed so that the voltage controlled oscillator 206 oscillates at a frequency of 24 MHz. The first frequency divider 207 divides the output of the voltage controlled oscillator 206 by a predetermined value (24 MHz / fh) [24 MHz ÷ (24 MHz / fh)] to generate a signal fh having a frequency corresponding to the horizontal frequency. As described above, this signal is compared by the phase comparator 204 to detect the phase difference value. This phase difference value is continuously fed back and locked so that the desired stable frequency of 24 MHz is always output.

The 24 MHz output number of the voltage controlled oscillator 206 is input to one end of the AND gate 208, and the applied voltage of the voltage terminal Vcc through the resistor R connected to the other end of the AND gate 208 is in the "high" state. In the case of, a 24 MHz signal is output from the output end of the AND gate 208.
This 24 MHz signal is input to the read control clock and sampling frequency end 203 of the triple speed circuit 100.

On the other hand, the 24 MHz signal is supplied to the second frequency divider 2
If the frequency is divided by three at 09, the signal becomes an 8 MHz signal and is input to the write control clock and sampling frequency terminal 202 of the triple speed circuit 100. This 8 MHz signal is divided by the third frequency divider 210 at a predetermined value (8 MHz / 3 fh) [8
MHz ÷ (8MHz / 3fh)], horizontal frequency (fh)
A signal 3fh having a frequency three times higher than that is generated as shown in b of FIG. 5 and input to the control clock terminal 201 of the triple speed circuit 100.

Therefore, the first to third A / th of the triple speed circuit 100
The analog video signals of red, green, and blue are written in the write control clock and sampling frequency end 2 according to the procedure of inputting to the R, G, B color ends R, G, B of the D converters 121 to 123.
02 input sampling frequency, ie 8M
The Hz signal is converted into the digital signals shown in a to c of FIG. In the first to third memories 141 to 143, the output signals of the write control clock and the sampling frequency end 202 are the write clock end WR CK.
When it is input to, the address signal is generated by counting inside the memory. This address signal causes the first to third memories 14 to
The digital signals output from the first to third A / D converters 121 to 123 are sequentially written in the writing areas 1 to 143.

Then, the counter 144 counts the signal 3fh, which is input to the control clock terminal 201 and corresponds to three times the frequency of the horizontal synchronizing signal shown in FIG.
Output to Qb. On the other hand, when the output states are generated in three states and the switch 150 is sequentially switched, the frequency of 24 MHz input to the read control clock and the sampling frequency end 203 is read from the first to third memories 141 to 143. It is input to the clock terminal RD CK and is counted inside the memory to generate a read address signal. Data corresponding to the read memory area is read by this address signal. When reading, the frequency is 24M, which is three times faster than the 8MHz signal when writing.
Since it is read out at Hz, it is possible to output a signal as shown in FIG.

The R, G, B digital data as shown in FIG. 3D which has passed through the switch 150 is converted into an analog signal by the D / A converter 160 by the read control clock and the frequency of 24 MHz at the sampling frequency end 203. It is output after being converted.

3 input from the D / A converter 160
Double-speed R, G, B analog signals are monochromatic picture tube 300
Input to the electron gun. Then, the R, G, B video signals including the composite sync signal output from the D / A converter 160 are separated into vertical and horizontal sync signals by the sync separation / deflection circuit 400, and the single color picture tube 300 is obtained. When the vertical / horizontal deflection during scanning is controlled at a triple speed, the color image signal as shown in d of FIG. 3 has a high luminance or a low luminance, for example, a black or white state as shown in d of FIG. Is displayed.

On the other hand, the state of the counter output terminal Qb of the triple speed circuit 100 is latched by the D flip-flop 145 and the counter 144 is alternately cleared every time it is "low",
The outputs from the output terminals Qa and Qb of the counter 144 are input to the AND gates 501 and 502 and the NOR gate 503 of the shutter drive circuit 500.

When the states of the output terminals Qa and Qb of the counter 144 are all "low", the output of the NOR gate 503 is "high", and the states of the output terminals Qa and Qb of the counter 144 are "high" and "low", respectively. In the case of "", the output of the AND gate 501 is "high", and when the output terminals Qa and Qb of the counter 144 are "low" and "high", the output of the AND gate 502 is "high". That is, when the output of the AND gate 501 is "high", the first electronic liquid crystal shutter 80 shown in FIG.
When the output of the AND gate 502 is "high", the second electronic liquid crystal shutter 90 is turned on by the signal shown in FIG. 5D, and when the output of the NOR gate 503 is "high", The third electronic liquid crystal shutter 110 is turned on and sequentially driven by a signal as shown at 5e. At this time, the signals c to e of FIG. 5 generated by the counting of the counter 144 input with the signal shown in FIG.
The waveform shown in R, G, a Film image signal synchronized with the signal of the B.

[0063] The R, G, when scanning the movies image signal B by compressing by H / 3 as in d of FIG. 6, the height luminance video signal to the image tube 300, is displayed, for example, black and white video signal However, since light has a unique wavelength depending on the color,
Depending on the wavelength, only the red component light is reflected by the first spectral mirror 40, and the blue and green component lights are transmitted. This is a basic characteristic of the spectral mirror. Then, the first spectral mirrors 40 to 9
The red component light incident at 0 ° is 90 ° at the first mirror 10.
Is reflected by On the other hand, the blue and green component light transmitted by the first spectral mirror 40 is converted into the second spectral mirror 5 by the wavelength of the light.
At 0, the green component light is reflected at 90 °, the blue component light is transmitted, and the green component light is again 90 ° at the second mirror 20.
Is totally reflected by.

At this time, the output of the AND gate 501 of the shutter drive circuit 500 drives the first electronic liquid crystal shutter 80 to pass the red component reflected from the first mirror 10, and the output of the AND gate 502 outputs the second electron. The liquid crystal shutter 90 is driven to pass the green component light reflected from the second mirror 20. The output of the NOR gate 503 drives the third electronic liquid crystal shutter 110 to drive the second spectral mirror 5
The blue component light that has passed 0 is passed.

The red component light passing through the first electronic liquid crystal shutter 80 is totally reflected at 90 ° by the third mirror 30, passes through the third spectral mirror 60, and the green component light passes through the second electronic liquid crystal shutter 90. The light is reflected by the third spectral mirror 60 at 90 ° and is incident on the fourth spectral mirror 70. And the fourth
The blue component light that has passed through the third electronic liquid crystal shutter 110 is passed through the spectral mirror 70, and the red component light that is reflected and passed through the third spectral mirror 60 is reflected according to the wavelength of the light. Then, the lens 600 focuses the component lights of R, G, and B colors to project a color image on the screen. At this time, the fourth spectral mirror 7 depends on the magnification of the lens 600.
A color image that has passed 0 can be enlarged to a desired magnification.

It should be noted that the present invention is not limited to the above embodiment, but can be modified as necessary.

[0067]

[Effect of the Invention] Since the image projection equipment of a projection display device according to the present invention in this way is to act configured, economically large screen high-precision color image using a single monochrome picture tube There is an effect that it can be projected on.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a configuration of a video projection device according to the present invention.

FIG. 2 is a detailed circuit diagram of a triple speed circuit 100 and a shutter drive circuit 500 of FIG.

FIG. 3 is an operation waveform diagram of the triple speed circuit 100 of FIGS. 1 and 2.

FIG. 4 is a detailed configuration block diagram of a PLL circuit 200 of FIG.

5 is an operation waveform diagram of the shutter drive circuit 500 of FIG.

6 is an operation diagram illustrating a 3 × speed scan in the image tube 300 of FIG. 1. FIG.

FIG. 7 is a schematic configuration diagram of a conventional image projection device using R, G, and B image tubes.

FIG. 8 is a schematic configuration diagram of a conventional image projection device using a liquid crystal display device.

[Explanation of symbols]

 10, 20, 30 1st to 3rd mirrors 40, 50, 60, 70 1st to 4th spectral mirrors 80, 90, 110 1st to 3rd electronic liquid crystal shutters 100 3 × speed circuit 200 PLL circuit 300 Image tube 400 Sync separation and deflection Circuit 500 Shutter drive circuit 600 Lens

Claims (5)

(57) [Claims] 1. An image projection device of a projection display device, wherein red, green, and blue image signals sequentially arranged in time series are supplied to the red, green, and blue signals for one horizontal scanning line through a monochromatic image tube.
A conversion means for converting an optical signal having a light wavelength corresponding to each of green and blue video signals, wherein the red, green and blue video signals are a write / read control clock signal, a sampling frequency signal and a control signal. A double speed part for converting to n times speed according to a signal, and a phase locked loop for supplying a write / read control clock signal, a sampling frequency signal and a control signal used for converting the red, green and blue video signals in the double speed part. Section, a sync separation and deflection section that separates and generates a synchronization signal for vertical and horizontal deflection from the red, green, and blue video signals converted by the double speed section, and the output of the double speed section is synchronized and separated. Red, green and blue monochromatic component light from the converted light signal, and a conversion means having a display portion for displaying optical signals corresponding to red, green and blue in accordance with the sync signal The a separating means for separating each item, the converted manual
The red, green, and blue components of the stage output depend on the wavelength of light.
From a spectroscopic mirror that disperses into an optical signal and the spectroscopic mirror
Formed by a mirror that reflects the output component optical signal
Separating means and focusing means for focusing the separated red, green and blue component optical signals, wherein the separated red, green and blue monochromatic component optical signals
The opening and closing means for selectively passing through the numbers and this opening and closing means
An open / close drive unit that outputs a drive signal for driving
The red, green, and blue component optical signals that have passed through the opening and closing means are reflected and reflected.
And a converging portion that is transparent and converging
An image projection apparatus for a projection display apparatus, comprising: a focusing unit . 2. The three-speed converter inputs three red, green and blue video signals and converts them into digital signals according to a predetermined sampling frequency signal, and each of the red, green and blue converters. Three memories for writing / reading the digital signal of, a counter for receiving and counting the control signal output from the phase locked loop unit, and receiving the control signal as a clock signal for latching the output of the counter. A D flip-flop provided as a clear signal for the counter, a switch for controlling reading of data stored in the memory by switching depending on an output state of the counter, red, green, and blue read from the memory D / A converters for converting the digital signals of the above into the respective red, green and blue analog signals by the predetermined sampling frequency signals Video projector of the projection type display device according to claim 1, characterized in that it comprises a. 3. The write / read control clock signal and sampling frequency signal supplied from the lock loop section to the double speed section are converted into the memory by converting the red, green and blue video signals by an A / D converter. A write control clock signal and a sampling frequency signal for writing, and a read control clock signal and a sampling frequency signal for reading control of the digital signal written in the memory and converting it into an analog signal by a D / A converter. The image projection apparatus of the projection display apparatus according to claim 2, wherein the read control clock and the sampling frequency are formed to be three times the write control clock and the sampling frequency. 4. The liquid crystal having a single pixel as the opening / closing means.
The image projection device of the projection display device according to claim 1, wherein the image projection device is formed of a shutter . 5. The opening / closing drive section is a counter of the double speed section.
Switching signal for red, green, and blue component light output from
No. is received, and the switch is opened and closed according to its logical combination value.
Depending on the logic element that outputs the drive signal to drive the stage
The image projection apparatus of the projection type display apparatus according to claim 1, wherein the image projection apparatus is formed as follows .