JPS5896480A - Color picture reproducing device - Google Patents

Abstract

PURPOSE:To reproduce color picture with high resolution, by using one black- and-white cathode-ray tube and reproducing red, blue and green pictures with prescribed period sequentially. CONSTITUTION:In applying primary color signals, red, blue and green ER, EB and EG to a black-and-white cathode-ray tube 1, the image light from the picture obtained on a fluorescent screen 1a is applied to an electronic chroma filter 3 via a lens 2, the red, blue and green lights are selectively brought in and finally, the red, blue and green light lR, lB and lG out of image light are applied to a screen 4. Red, blue and green images SR, SB and SG magnified with the lens 2 are formed on the screen 4. Since the primary color signals ER, EB and EG are switchingly applied to the cathode-ray tube 1 at each horizontal period, then the pictures SR, SB and SG are formed on the screen 4 at one horizontal period and the observer 5 can watch the magnified color picture SC on the screen 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color video playback device suitable for use in, for example, a video projector, and particularly to a color video playback device that is simple in construction, has only a simple configuration, and is capable of producing color video with high resolution. This is what I did.

Conventional color video playback devices proposed include a shadow mask color video playback device using a shadow mask type color cathode ray tube, and a beam index type color video playback device using a beam index type color cathode leg tube. has been done.

In the shadow mask type color imaging device using a shadow mask type color cathode capillary, three electron beams modulated by MIF using the three primary color signals of red, green and blue are arranged on each fluorescent surface. It is necessary to correctly strike the corresponding color light bodies among the light bodies with different color values, so that there is no color shift. Therefore, this contract circuit,
For example, consequence circuits are required, and not only the circuit configuration becomes complicated, but also its p+ integrity is far away.

On the other hand, the beam index type color gorge reproduction device has a single electron beam as a picture tube, and has a fluorescent surface with red, green, and blue colored light stripes arranged in sequence in the horizontal direction. Index phosphor stripes are arranged horizontally on the inner surface of the phosphor, and switching is performed based on signals obtained by scanning the index phosphor stripes with an electron beam. ,1
When the child beam scans the red color phosphor stripe, it uses the red primary color signal, when it scans the green color phosphor stripe, it uses the green primary color signal, and when it scans the blue color phosphor stripe, it uses the red primary color signal. Each of the blue primary color signals is densely signaled one flin. Therefore, this also allows for the density-changed electron beam of each primary color signal to accurately hit the corresponding color phosphor stripe in order to avoid variations in the interval between the index phosphor stripes and the time delay of the detection signal. It is extremely difficult to do so. Additionally, an additional circuit or the like is required to correct t, which may result in a voltage problem that results in a complicated circuit configuration.

Further, in color video reproduction apparatuses using these shadow mask type or beam index type color cathode ray tubes, the fineness of the color phosphors arranged on the fluorescent surface is limited. Therefore, especially when miniaturized, the pixels are coarse,
The disadvantage is that the deterioration of the degree of disintegration is severe.

In view of these points, the present invention is designed to eliminate the drawbacks of the conventional color image reproduction system described above.

Hereinafter, an embodiment of the color image reproduction device according to the present invention will be explained with reference to the drawings. In this example, the present invention is applied to a video projector.

As shown in FIG.
a black and white cathode ray tube (1) which is supplied with primary switching for each H);
A lens (2) disposed in front of the monochrome cathode ray tube (1) magnifies and forms an image on a screen (4) of the image obtained on the fluorescent surface (1a) of the monochrome cathode ray tube (1); Primary color signals E of red, blue and green are transmitted near the screen (4) side of the lens (2) and supplied to the monochrome cathode ray tube (1).
The 4I! color filter (3) is switched to correspond to R, EB, and EG, and its groove lines are switched to reversely transport red, blue, and green light, respectively. ! It is something that will be accomplished.

Then, as shown in the principle diagram in Fig. 2, a black and white cathode ray tube (1
The image obtained on the fluorescent surface (la) of No. 1 is the red primary color signal E.
When the image light is generated by an electron beam modulated in R, as shown in FIG. 2A, the image light from this image is passed through a lens (2) and an electronic color filter (3),
Of this image light, only red light IIR is supplied to the screen (4). Therefore, the red color P#88 magnified by the lens (2) is imaged on this screen (4). In addition, the black and white image projected on the fluorescent surface (la) of the black and white shadow film IM tube fil is displayed by the positive and green primary color signals EB and EG.
Similarly, when the image light is generated by a modulated electron beam, only blue and green light of the image light is supplied to the screen (4), as shown in Fig. 2B and C. Then, Fufuzen and Midori Eirin SB and SG are imaged. In this way, the black-and-white shadow ff-ray tube illuminating Mizuko period (I
h) red, blue and green, primary color signals ER, EB and EG
is switched and supplied, so 1 is displayed on this screen (4).
Red, blue and green images SR, SB and 8 are sequentially displayed in each horizontal period.
G is imaged and the observer (51) - (4)
All you can do is look at the color image SC enlarged above.

In this example, red, blue, and green primary color signals ER; EB and EG are sequentially switched and supplied to the monochrome cathode ray tube 111 every horizontal period. In other words, color v! The primary color signals ER, EB, and EQ obtained from the j-circuit (not shown) are each connected to a gate circuit (6K).
(6B) and (6G). These gate circuits (1), (6B), and (6G) are shown in FIG.
Puls No. 746 PR, PB and PQ as shown in D and E are provided as gate No. 16. Then, the primary color signals ER, EB and EG are sequentially extracted during the period when the pulse signals PR, PB and PG are at the cylinder level "'1". The primary color signals extracted by the gate circuits (614), (6B), and (6G) are sequentially supplied to the monochrome cathode ray tube (1).

Pulse signals pR, p as shown in FIG. 3 C, D and E
B and PG are, for example, cedar barked at a ring counter (7). That is, this ring counter (7) has three J- and flip-flops (7) (L) (7B) as shown in FIG.
and (7G). A horizontal synchronizing signal PH as shown in FIG. The set terminal Sr, the reset terminal) Lb and the reset terminal) tg of the
A frame signal PF of z is supplied. Therefore, these three
two flip-flops (71 () (7B) and (7G)
When the frame signal PF is supplied to the output terminals QR, QB, and QGK, signals of '111, @0'' and 10'' appear, and thereafter, each time the horizontal synchronizing signal PH is supplied, the output terminals QR, QB and QGK sequentially change to '0'. ″, “1” and o″→″0”, ’0″
and 1″-+”l”,’0” and”On→・・・・・・
In other words, the respective output terminals QR, QB and QG are supplied with signals PR, PB and PQ as shown in FIG. 3C, D and E. This is the gate circuit (61-t) (61-t) mentioned above.
13) and (6G) as a gate signal.

Further, the lens (2) is arranged in front of the fluorescent surface (1a) (on the screen (4) side). In this case, the image obtained on the fluorescent surface (1a) is inverted and magnified by this lens (2) and then imaged on the screen (4). Therefore, in order to ensure that the image formed on the screen (4) has the correct positional relationship, an inverted image is obtained on the fluorescent surface (1a) of the monochrome cathode ray tube il+.

Further, the electronic color filter (3) is arranged as shown in an enlarged view in Fig. 5, and the screen of the lens (2) (
It is located near 41ft11. That is, this electronic color filter (3) has five different planes of polarization,
Polarizer (8a) consisting of one thin polarizing plate arranged on both sides
and an analyzer (8b), an optical phase plate (9) of an optical bias adding piece arranged between the polarizer (8a) and the analyzer (8b), and an electro-optical element, in this example, P LZ T
(8rBaNb306) (10a) and an optical phase difference control device QO1. In Fig. 5, the phase plate (9) is located on the polarizer (8a) side, and the optical phase difference control device &01 is located on the analyzer (8b) side, but these positions are reversed. It may be.

The optical phase plate (9) utilizes the birefringence of crystal or optically anisotropic plastic, and has a fixed optical phase difference of approximately 900 nm in this example. It is designed to be given as a phase difference.

In addition, the optical phase difference control device 0 [as shown in FIG. 6]
'For example, nickel (Ni) is applied to the surface of LZT (10a).
Linear control electrodes (IOL) made of an alloy of chromium (Cr) and chromium (Cr) plated with gold (Au) are arranged at intervals of Lo, and this fb control electrode (10L)
A similar linear control electrode (lOH
). Here, these control m* poles (10L) and (10H) are PLZT (10a
), but in this example, as shown in FIG. 7, they are arranged in exactly the same way on the other side.

Each of the control electrodes (1 nL) are commonly connected and grounded. The 11 control poles (IOH) are each connected to a terminal at+ via a resistor Ro for preventing excessive W flow.

By the way, as shown in FIG.
Electrodes (12a) and (12
b) are arranged, and these electrodes (12a) and (12b)
When a potential difference V is applied between them, the refractive index turns purple due to the Kerr effect, etc., and the light L passing through this PLZT (loa)
It is known that a predetermined optical phase difference "PLZT" corresponding to the potential difference (2) is given to the optical waveguide 1. The optical phase difference control device mao+ of this example utilizes this fact.

Optical phase difference control device QO! shown in FIG. A drive circuit (13) as shown in FIG. 9 is connected to the terminal 0υ of the drive circuit (13), and a primary color signal ER is supplied to the monochrome cathode ray tube +11.

According to EB and EG - ('control electrode (lOL) and h (lOH) arranged on PLZT (10a)
As shown in FIG. F, potential differences are applied to VR, VB, and VG, respectively. In other words, the control electrode (IOL
) and (lOH) and PLZT (10
A capacitor Co (hereinafter referred to as equivalent capacitor CO) is isometrically formed with a), and this capacitor C
The charging pressure vO of O is set to be VR, VB, and VG, respectively.

In this case, when the potential differences between the control electrodes (1OL) and (1OH) are vRIVB and VQ, respectively, the optical phase difference control device αα gives an optical phase difference “PLZT” corresponding to these potential differences, as described above. However, the optical phase difference given in each case is rPLzT(R)-F
When PLzT(B) and "PLZT(G)" -r6
+7'PLZT(R)=920-950 nm
-----(11FO+rPLzT(B)21075
~11250m・Song・(2) rO” rPLZT(G)
"1305~l 355 nm ・------(
The VR, VB, and VGO values are set so that the value becomes 31. In this example, since the optical phase difference rO given by the optical phase plate (9) is 900 nm, for example ■R=2
80V, VB=33 nV k U VG=480V
(!: Sare, rPLZT(R)” 20~50n
m, r PLZT(B) = 175-225 nm
and 7'PLZT(G) = 405 to 455 dishes.

Now, let us consider the drive circuit o3 shown in FIG. In the figure, terminal 0 indicates a power supply terminal to which a positive DC voltage 1B1, for example, 500V is supplied, and this power supply terminal Q4) includes a smoothing capacitor o9, a flexible resistor o61, and a resistor (1
It is grounded through a series circuit with a 7+ series circuit, and is also connected to the collector of an npn transistor a8.

A voltage VG (48
0V) is obtained, and this is supplied to the transistor α (-). Also, the emitter of this transistor is np
n-type transistor [alpha]]. Also,
Pulse signals PR and FB as shown in FIG. 3C and D are supplied to the npn transistors Q4 and (c) through terminals - and (211), respectively.

The emitters of each of the transistors (2 and (c) are grounded, and the collectors of each are connected through a series circuit of semi-fixed resistors C!~ and C~, and the connection of these semi-fixed resistors and Q9 The midpoint P is connected to the emitter of the transistor H via a resistor (to).In this case, when transistors (2) and (2) are on, the connection midpoint PKt voltage Va
The semi-fixed resistor 241 and the resistor are set so that the voltage VB (280V) and the voltage VB (330V) are applied. This connection midpoint P is connected to the base of an npn transistor (2), the collector of this transistor (support) is connected to the emitter of a transistor QFj, and the emitter of this transistor is connected to the transistor Q via a resistor
9 and the base of the PNP type transistor. The collector of the transistor (to) is grounded, and the transistor α! The emitters of l and (c) are connected to each other, and the connection point of these emitters is the above-mentioned terminal tll.
lK & continued.

Here, one horizontal period in which the green primary color signal EQ is supplied to the monochrome cathode ray tube +11, that is, a period in which the pulse signal PG as shown in FIG.
O's light! When the voltage vQ = vQ (480V) has elapsed and the red primary color signal ER is supplied to the monochrome cathode ray tube (1), the pulse signals PR and PB are at high level 11, respectively, as shown in FIG. 3C and D. '' and low level 10'', transistor Q is turned on and transistor (c) is turned off, and a heavy voltage VB (28 (IV)) is obtained at the connection midpoint P. Therefore, at this time, the transistor The equivalent capacitor CO is discharged, and its charging voltage v□ is V
R (280V) is turned on until it is turned on, and this charging voltage v□ is immediately set to VR (280V).Then,
This charging voltage VQ=VR (280V) is a black and white cathode ray tube (
1), its value is held for one horizontal period when the red primary color signal ER is supplied. Next, one horizontal period in which the red primary color signal ER is supplied to this monochrome cathode ray tube (1), that is, FIG.
The period when the signal pH is at one level 11'' as shown in
o = VR (280V)), black and white cathode ray tube (1
) is supplied with the blue primary color signal EB, as shown in FIG. 3C and D, the pulse signals PR and PBFi have a low level of 10'' and a high level of ``'1'', respectively, so the transistor c! The transistor is turned on, and a voltage VB (33 flV) is obtained at the connection midpoint P. Therefore, at this time, the transistor (19) emits light to the equivalent capacitor Co, and its charging voltage o becomes VB (330 V). ), and this charging 11w pressure v□ immediately becomes V
B (330■) and this charged W pressure vO=
VB (330V) is maintained at its level for one horizontal period when the evening primary color signal E1 is supplied to the monochrome cathode ray tube (1). Next, a horizontal period in which the blue primary color signal BB is supplied to this black and white cathode # tube (11), that is, a period in which the signal PB is at a high level ``'' as shown in Figure 3 (the low-value capacitor c
.

When the charging voltage V□ = VB (33 ('IV)) has elapsed and the green primary color signal EQ is supplied to the monochrome cathode ray tube (1), the pulse signal PR as shown in FIG.
and PR are both low and become "bell", transistors (24 and (c) are both turned off, and voltage VG (480V) is obtained at the connection midpoint P. Therefore, at this time, transistor a9 is The equivalent capacitor CO is charged and kept on until the optical object voltage v□ reaches VG (480V), and this charging voltage o immediately becomes VQ (480V).
). Then, this charging pressure VO”VG (4
80V) is maintained at that level for one horizontal period when the green primary color signal EG is supplied to the monochrome cathode thin tube flll. As a result, the primary color signals BR, EB and EG supplied to the monochrome cathode tube fl)
The charging 11rt pressure of the equivalent capacitor CO according to ■o is ■R
2VB and 'Vc. That is, PLZT(1(la
), the potential differences between the poles (IOL) and (1nH) are VR, VB and vG, respectively, as shown in Figure 3F.
It is said that

The electronic color filter (3) is configured as described above, and the optical phase plate (9) and the optical phase difference control device 001 provide an optical phase difference r = r 6 + r PLZT. In this case, as mentioned above, in each period when the red, blue and green primary color signals ER, EBEt and BG are supplied to the monochrome cathode ray tube (1), r=92n to 950nm.
.

1075 to 125 nm and 1305 to 1355 nm.

By the way, it can be expressed as a function of the electronic color ray F configured as described above, as shown in the following equation.

In this equation (4), λ is the wavelength of light.

It is expressed as shown in Fig. 1 by curved AR, and the wavelength λ is 62
It reaches its maximum at 0 nm (wavelength of red light). As mentioned above, during the period when the red primary color signal ER is supplied to the monochrome cathode ray tube (11), the optical phase difference F is 920 to 950.
nm, so during this period, red light in particular among the light that enters the Ichiko color filter (3) is passed through and output. Moreover, when the optical phase difference F is 1075 to 1125 nm, it becomes maximum at the light plate length of the electronic color filter (3). As mentioned above, during the period when blue primary color (G EB) is supplied to the monochrome cathode ray tube (1), the optical phase difference F is 1075.
Since the wavelength is set to 1125 nm, particularly blue light among the light input to the electronic color filter (3) is concentrated and output during this period.

Moreover, when the optical phase difference F is 1305 to 1355 nm, the light transmission characteristic exhibited by the Tomiko color filter (3) becomes large. As mentioned above, during the period when the green offshore signal EG is supplied to the monochrome cathode ray tube (1), the optical phase difference F is set to 1305 to 1355 nm, so during this period, the electronic color Of the light input to the filter (31), the green light in particular is passed through and output.

From the above, in this example, when the primary color signals ER, EB, and EG of red, blue, and green are supplied to the monochrome cathode tube +11, the image produced on the fluorescent surface (la) is After passing through the lens (2), the image light is supplied to an electronic color filter (3), where the red, evening and green lights are selectively passed through. yt, Rn
, 'IB and ρG are supplied to the screen (4). Therefore, red, blue and green images SR, 8B and SQ magnified by the lens (2) are formed on the screen (4).

Since red, blue, and green primary color signals ER, EB, and EG are switched and supplied to the black-and-white cathode ray tube +11 every horizontal period, the signals are sequentially displayed on this screen (4) every horizontal period. Red, blue, and green images SR, SB, and 8Q are formed, and the observer (5) can see an enlarged color image 8C on this screen (4).

As is clear from the embodiments described above, according to the color image reproducing apparatus according to the present invention, one black and white cathode capillary is used to sequentially display red, blue and green images SR, 8B and 8Q at predetermined positions at a predetermined period. Since it reliably obtains and reproduces color images Sc, there is no color fading compared to conventional color image reproduction devices that use shadow mask type or beam index type color cathode tubes, and moreover, it can reproduce high-resolution color images. can be played. Furthermore, since there is no color shift, there is no need for any correction circuitry.
- The road configuration is also simplified.

Next, FIG. 11 shows a middle embodiment of the present invention. In FIG. 11, parts corresponding to those in FIG. m1 are designated by the same reference numerals. In this Fig. 11, the lens (
2') is disposed in front of the fluorescent surface (1a) of the black and white cathode tube fl'l, similar to the lens (2) in the example of FIG.

However, in this case, the focus of this lens (2') is set behind this fluorescent surface (1a), and the observer (5) uses this lens (2') to focus on the fluorescent surface (1a). It is possible to view an enlarged version of the resulting image. In other words, this lens (2') is designed to function as a magnifying glass lens. Furthermore, this 11th
In the ψ position in the example shown, there is no inversion of the image by the lens (2'), and therefore, unlike the example in Figure 1, images are obtained in the correct positional relationship on the fluorescent surface (1a) of the monochrome cathode ray tube (11). The relationship between them is as shown in the example in Fig. 1 (-1).

Also in this example in FIG. 11, the electronic color filter (31 is
The black-and-white cathode ray tube (11) is configured to selectively pass red, blue, and green light, respectively, in accordance with red, blue, and green primary color signals ER, EB, and EG supplied to the cathode ray tube (11).

Therefore, as shown in the principle diagrams of FIGS. 12A, B, and C, this example in FIG. The image light from the image obtained on the fluorescent surface (la) is passed through the lens (2
') are supplied to the VK deaf color filter (3) to selectively pass the red, positive and green lights, respectively, and finally the red, real and green lights QR1QB and tG of the image light are transmitted to the observer. (5). Therefore, the observer (5) sees the fluorescent surface (l
The red, W, and green virtual images SR, 8B, 1JI, and 8G magnified by the lens (2') K can be seen in the garden at a predetermined position behind a). And a black and white cathode ray tube (11
Red, positive and green primary color signals ER, EB and B for each horizontal period
Since Q is switched and supplied, the observer (61 is at a predetermined position fkl
The red, evening, and green images SR, 8B, and 8Q are sequentially viewed in each K1 horizontal period, and therefore the observer (5) can view the color image 8C enlarged at this predetermined position &tK. Even in the example shown in FIG. 11, it is possible to obtain a beautiful color image 8C using one monochrome cathode 1M tube, so that the same effects as in the example shown in FIG. 1 can be obtained.

In the wJ11 diagram example, the lens (2') is not a single magnifying glass lens, but the front (
It is also possible to form a real image on the black-and-white cathode ray tube (1) (on the opposite side) and view it using an eyepiece (not shown) by the observer (5). In this case, the lens (2'
) causes image reversal, so black and white shadows! In this case, it is necessary to invert and obtain an image on the fluorescent surface (1a) of the thin tube (1).

In addition, in the above embodiment, the fluorescent rk+ (ta) → lens (2) (2') → deuteron color filter (3) are arranged in this order, or the lens (2) (2') and the electronic color filter The arrangement relationship with filter (3) may be the opposite.

In addition, in the above-mentioned actual plane example, the black and white cathode ray tube (1) is
Red, green, and red primary color signals ER, EB, and E are transmitted every horizontal period.
Q was supplied to form the color bar*Sc, but the horizontal scanning frequency was tripled to the normal one, and at this time, the red, evening and green additive color signals ER, EB for one horizontal scanning
It is easily possible to obtain the red, blue, and green images SR, SB, and 8G at predetermined positions for each iH by using the line memory and EQ. In this case, a color image with even higher definition can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an embodiment of a color video reproducing device according to the present invention, Fig. 2 is a diagram explaining the principle of the example shown in Fig. 1,
Fig. 3 is a diagram showing the operation of the example in Fig. 1, Fig. 4 is a configuration diagram showing a specific example of the ring counter, and Fig. 5 is a diagram showing the configuration of the Ichiko color filter. The figure is a front view showing an example of an optical phase difference control device, and Figure 7 is a figure 6A-A.
'A cross-sectional view along the line, No. 8 and 1 is an electro-optical element (PLZT)
9 is a connection diagram showing a specific example of a drive circuit, FIG. 12 is a line diagram showing the principle of the example in FIG. 11 between stations. ill is a black and white cathode ray tube, (2) is a lens, (3) is an electronic color filter, and (4) is a diagram showing the principle of the example in FIG. screen, (5) is the observer, E
R, EB and EG are red, blue and green primary color signals, respectively. Figure 2 Figure 3 Fuma

Claims (1)

[Claims] It consists of a black and white cathode ray tube to which primary color signals of red, blue and green are sequentially switched and supplied at a predetermined period, a lens placed in front of the black and white cathode ray tube, and an electronic color filter placed near the lens, The electronic color filter has a pass band cut so as to pass red, blue and green light, respectively, in response to the upper red, blue and green primary color signals supplied to the monochrome cathode ray tube. A color video playback system* featuring