JPH0430237B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a television receiver suitable for application to a television receiver constituting a large-area video signal display device such as a projector.

BACKGROUND ART AND PROBLEMS The resolution of large-area video signal display devices such as projectors has increased significantly in recent years due to improvements in television receivers (cathode ray tubes, electric circuits) and lenses that constitute them. However, with this increase in resolution, scanning lines, which were not so noticeable in the past, become visible, which impedes improvement in image quality.

In other words, the screen display using the interlaced method is
When there are 525 scanning lines, 262.5 lines constitute one field, and by sending this at 60Hz, surface flicker is suppressed. Further, in order to obtain vertical resolution, as shown in FIG. 1, the next field after a certain field is scanned with a shift of 1/2 scanning line interval. In FIG. 1, lo and le indicate the scanning lines of the odd and even fields, respectively, and Bmo and Bme indicate the electron beams of the odd and corner fields, respectively.

However, in this case, even though macroscopically the number of images is 60 per second, microscopically one scanning line lights up every 1/30 seconds, and the display cycle is 1/30 seconds. It is. Focusing on point P in FIG. 1, the brightness of this point P increases every 1/30 second as shown in FIG. 2. Therefore, the light emission of one scanning line is visually perceived as flicker.

As an effective means to eliminate this frizz,
Conventionally, as shown in Figure 3, the electron beam Bmo
(Bme) for example, the original odd field scanning line
It has been proposed to make it vertically long so that it spans both lo and scanning lines le of even fields. In this figure 3, the point P is the same as in figure 1.
, the brightness of this point P increases every 1/60 second as shown in FIG. Therefore, by making the shape of the electron beam Bmo (Bme) vertically elongated in this way, each scanning line lo and le will emit light every 1/60 seconds, and flicker will not be felt.

However, in this way the electron beam Bmo
It is impossible to scan the entire screen with the shape of (Bme) vertically elongated, and the four corners in particular are twisted and become diagonally long, as shown in Figure 5, and the signals overlap in the horizontal direction. This results in a decrease in horizontal resolution. Also, electron beam
If the shape of Bmo (Bme) is vertically elongated, the slope TR of this luminance cross section will no longer be steep, as shown by the broken line in Figure 6, and for example, this will affect not only the N-th scanning line of the same field but also the N+1-th scanning line. This causes a decrease in vertical resolution. What is shown by a solid line in FIG. 6 is a brightness section of an electron beam having a normal shape.

Therefore, the present applicant first proposed a television receiver that does not cause a decrease in resolution and does not cause the flickering of scanning lines as described above.

FIG. 7 shows an example in which this is applied to a television receiver constituting a projector, and this will be explained first.

In the same figure, 1R, 1G and 1B are respectively red,
This is a projection type cathode ray tube for generating green and blue color images S _R , S _G and S _B . Although not shown, the red, green, and blue color images S _R ,
The image lights from S _G and S _B are supplied via a projection lens onto a screen in an overlapping manner, and a color image is displayed on this screen.

The cathode ray tubes 1R, 1G and 1B are each of a two-beam type. That is, the first and second cathodes related to the first and second electron beams Bm ₁ and Bm ₂
K ₁ and K ₂ are provided side by side, and the first and second
The first and second electron beams Bm ₁ and Bm ₂ from cathodes K ₁ and K ₂ are scanned simultaneously on the screen in the vertical direction with an interval of 1/2 of the scanning line interval. For example, as shown in Figure 8,
In the even field, as shown by solid circles in the same figure, the first and second electron beams Bm ₁ and Bm ₂
are the original even and odd field scan lines le, respectively.
and lo, and in odd fields, the first and second electron beams Bm ₁ and Bm ₂ scan the scanning lines lo and le, respectively, as indicated by the dotted circles in the figure. . For example, as shown in FIG. 9, in an even field, the first and second electron beams Bm ₁ and Bm ₂ scan the scanning lines lo and le, respectively, as indicated by solid circles in the figure. , in the odd field, the first and second electron beams are
Bm ₁ and Bm ₂ are arranged to scan scan lines le and lo, respectively.

The cathode ray tubes 1R, 1G and 1B are configured as a Trinitron (registered trademark) type as shown in FIG. 10, or as a two-electron gun type as shown in FIG. It has first and second cathodes K ₁ and K ₂ for two electron beams Bm ₁ and Bm ₂ . 1st
In Figure 0, _G1 to _G5 are grids, CONV is a convergence electrode (electrostatic deflection plate), and DY is a deflection yoke. In addition, in FIG. 11, G ₁ ~
G ₄ is the grid and DY is the deflection yoke. Further, in FIGS. 10 and 11, 3 is a fluorescent surface.

In order to space the first and second electron beams Bm ₁ and Bm ₂ on the screen, that is, on the fluorescent surface 3, in the vertical direction by an interval of approximately 1/2 of the scanning line interval,
For example, the first and second electron beams Bm ₁ and Bm ₂
A predetermined magnetic field is applied from the outside to the passage.

Consider the case where the first and second cathodes K ₁ and K ₂ are arranged horizontally side by side. In this case,
On the cathode side of the deflection yoke DY, where the first and second electron beams Bm ₁ and Bm ₂ are separated (therefore, the center of grid G ₄ in Fig. 10 is not possible), in a plane, for example the 12th
As shown in the figure, a horizontal convergence yoke 4 is provided, and as shown in FIG. 13, a vertical convergence yoke 5 is provided. In FIGS. 12 and 13, 6 is a net, x is a horizontal direction, and y is a vertical direction. 1st
The horizontal convergence yoke 4 shown in FIG. 2 includes, for example, a core 4a disposed in the horizontal direction
and 4b, a coil 4c is wound in a predetermined direction, a direct current _SDH of a predetermined magnitude is passed through the coil 4c, and a predetermined magnetic pole is generated on the protruding pieces of the cores 4a and 4b. It is. If the magnetic poles generated on the protruding pieces of the cores 4a and 4b are as shown in the figure, a magnetic field as shown by the broken line will be generated, and the first and second electron beams Bm ₁ and Bm ₂ will be directed toward the paper surface. (), these first
Forces F _1H and F _2H which are opposite to each other in the horizontal direction are applied to the second electron beams Bm ₁ and Bm ₂ .
In this case, by controlling the magnitude of the magnetic field, that is, by controlling the magnitude of the direct current S _DH , the force F _1H
and F _2H vary. Note that if the magnetic poles generated on the protruding pieces of the cores 4a and 4b are opposite to those shown in the drawing, the directions of the forces F _1H and F _2H will be opposite to those shown in the drawing. Therefore, by changing the direct current S _DH , for example, the first and second electron beams Bm ₁ and Bm ₂ can be placed at the same position in the horizontal direction, for example at the center of the fluorescent surface 3.

Further, the vertical convergence yoke 5 shown in FIG. 13 has cores 5a, 5b, 5c and 5d arranged around the net 6 at an angular interval of 90 degrees between the horizontal direction x and the vertical direction y. coil 5
A coil 5e is wound in a predetermined direction, and a DC current _SDV of a predetermined magnitude is passed through the coil 5e, and the cores 5a and 5
Predetermined magnetic poles are generated on the projecting pieces b, 5c, and 5d. Cores 5a, 5b, 5c and 5
If the magnetic poles generated at d are as shown in the figure, a magnetic field as shown by the broken line will be generated, and if the first and second electron beams Bm ₁ and Bm ₂ are directed toward the paper (), then these Forces F _1V and F _2V directed in opposite directions are applied to the first and second electron beams Bm ₁ and Bm ₂ in the vertical direction y. In this case, by controlling the magnitude of the magnetic field, that is, direct current
The forces F _1V and F _2V change by controlling the magnitude of S _DV . Note that if the magnetic poles generated on the protrusions of the cores 5a, 5b, 5c, and 5d are opposite to those shown in the drawings, the directions of the forces F _1V and F _2V will be opposite to those shown in the drawings. Therefore, by changing the direct current S _DV , for example, the first and second electron beams Bm ₁ and Bm ₂ are set at approximately 1/2 of the scanning line spacing in the vertical direction at the center of the fluorescent surface 3, for example. They can be separated by an interval.

In addition, when the first and second cathodes _K1 and _K2 are arranged in parallel in the vertical direction, the convergence yoke 4 shown in FIG. 12 is rotated by 90 degrees and used for vertical use. The convergence yoke 5 shown may be used as is for horizontal purposes.

In addition, as shown in Fig. 14, a twist coil 7 is wound around the neck (not shown), and a DC current is applied to it.
By flowing S _D , a magnetic field in the tube axis direction can be generated. Therefore, as shown in FIG. 15, if the direction of the magnetic field from this coil 7 is A, the first electron beam Bm ₁ is given a (○·) force F ₁₁ directed from the plane of the paper, and the second The electron beam Bm ₂ is given a force F ₁₂ ( ) toward the paper surface. Therefore, this coil 7 has first and second cathodes.
In place of the vertical convergence yoke in the case where K ₁ and K ₂ are paralleled in the horizontal direction, and in place of the horizontal convergence yoke in the case where the first and second cathodes K ₁ and K ₂ are arranged in parallel in the vertical direction Can be used.

Note that due to the assembly precision of the deflection yoke DY and the electron gun, unique misconvergence usually occurs in each cathode ray tube. Therefore, in this example, as shown by broken lines in FIGS. 12 and 13, correction signals S _CH and S _CV are passed through the coils 4c and 5e together with the DC currents S _DH and S _DV , and the fluorescent surface 3
Throughout the above, the first and second electron beams
Bm ₁ and Bm ₂ are at the same position in the horizontal direction x, and approximately 1/2 the scanning line interval in the vertical direction y.
are corrected so that they are separated by an interval of .

The correction signals S _CH and S _CV are made to differ depending on the mode of misconvergence.

For example, when a horizontal misconvergence as shown in FIG. 16A occurs, a sawtooth wave current having a period of 1 V for one vertical period as shown in FIG. 17A is supplied as the correction signal S _CH . In FIG. 16, the "X" mark and the "O" mark indicate the first and second electron beams Bm ₁ and Bm ₂ , respectively. As described above, the first and second electron beams
Bm ₁ and Bm ₂ are placed at the same position on the fluorescent surface 3 in the horizontal direction x, and are spaced apart from each other by approximately half the scanning line interval in the vertical direction y. However, in FIG. 16, for convenience, the first and second electron beams Bm ₁ and Bm ₂ are shown at the same position both in the horizontal and vertical directions. Furthermore, when horizontal misconvergence as shown in FIG. 16B occurs, a parabolic wave current having a period of 1V as shown in FIG. 17B is supplied as the correction signal S _CH . Also, the first
When horizontal misconvergence as shown in FIG. 6C occurs, a sawtooth wave current having a period of one horizontal period 1H as shown in FIG. 17C is supplied as the correction signal S _CH . Furthermore, if horizontal misconvergence occurs as shown in Figure 16D,
A parabolic wave current having a period of 1H as shown in FIG. 17D is supplied as the correction signal S _CH . In addition, when horizontal misconvergence as shown in Fig. 16E occurs, the correction signal S _CH is
A current having a waveform obtained by integrating a sawtooth wave with a period of 1V and a sawtooth wave with a period of 1H as shown in FIG. 7E is supplied. Further, when horizontal misconvergence as shown in FIG. 16F occurs, a current having a waveform integrated with that shown in FIG. 17E is supplied as shown in FIG. 17F. Note that these are typical, and in reality, the current waveforms in each of the above cases are combined to form the correction signal S _CH .

Although the above has been described regarding the correction signal S _CH , the correction signal S _CV can also be considered in the same way.

Further, as shown in FIG. 18, for example, the correction signals S _{CH and} S _CV for each part of the fluorescent surface are written in the memory in advance, and the first and second electron beams Bm ₁ and _Bm It is also possible to sequentially read and supply data corresponding to _{the second} scanning position.

In Figure 18, 8 is nf _H (n is, for example, 5 to 50
, where f _H is an integer of horizontal frequency), and the signal from this signal with a frequency of nf _H is supplied to a counter 9 which forms a read address signal. Further, 10 indicates a signal generator that generates a frequency signal of _fH , and the signal of frequency _fH from this is supplied to a counter 11 which reads and writes and forms an address signal, and is also supplied to a counter 9 as a reset signal. be done. Further, a vertical synchronization signal Vsync is supplied from the terminal 12 to the counter 11 as a reset signal. From counters 9 and 11,
Read address signals corresponding to the scanning positions of the first and second electron beams Bm ₁ and Bm ₂ are obtained,
This is supplied to memory 13. Correction signals S _CH and S _CV corresponding to the scanning positions of the first and second electron beams Bm ₁ and Bm ₂ are written in advance in the memory 13, and are sequentially read out based on the address signal. The read correction signals S _CH and S _CV are latched by the latch circuit 14, and then D-
It is converted into an analog signal by an A converter 15, and further passed through a low pass filter 16H, 16V and an amplifier 17.
For example, it is supplied to the horizontal convergence yoke 4 and the vertical convergence yoke 5 through H, 17V.

Furthermore, due to the design of the cathode ray tube, the above-mentioned direct current
S _DV and S _DH may not be necessary. For example, the first
and second cathodes K ₁ and K ₂ are arranged in parallel in the horizontal direction so that the first and second electron beams Bm ₁ and Bm ₂ are at the same position in the horizontal direction, for example at the center of the fluorescent surface 3. If it were, the direct current S _DH would not be necessary. Further, for example, the first and second cathodes K ₁ and K ₂ are arranged in parallel in the vertical direction, and the first and second electron beams Bm ₁ and Bm ₂ are the same in the horizontal direction at, for example, the center of the fluorescent surface 3. position,
If the spacing in the vertical direction is approximately 1/2 of the scanning line spacing, the direct currents S _DH and S _DV are unnecessary.

Moreover, the above is the first and second electron beam Bm ₁
Although the magnetic vertical convergence yoke 5, the horizontal convergence yoke 4, or the twist coil 7 are used to control the scanning position of Bm 2 and Bm ₂ , the present invention is not limited thereto. The scanning positions of the first and second electron beams Bm ₁ and Bm ₂ may be electrostatically controlled by providing correction plates orthogonal to each other and applying a control voltage to these plates.

The cathode ray tubes 1R, 1G, and 1B are configured as described above, and the first and second electron beams Bm ₁ and Bm ₂ from the first and second cathodes K ₁ and K ₂ scan the screen in the vertical direction. They are scanned simultaneously with a spacing of 1/2 the line spacing.

In the example in FIG. 7, these cathode ray tubes 1R, 1
the first and second cathodes K ₁ of G and 1B, respectively;
The same red primary color signal R, green primary color signal G, and blue primary color signal B are respectively supplied to K ₂ and driven.

That is, in FIG. 7, 18 is an antenna, 19 is a tuner, 20 is an intermediate frequency amplifier, and 21 is a video detection circuit. The video signal S _V obtained from this video detection circuit 21 is sent to the luminance signal/chrominance signal separation circuit 22.
supplied to The luminance signal Y obtained from this separation circuit 22 is supplied to a matrix circuit 23. Furthermore, the color signal C obtained from the separation circuit 22
is supplied to the color demodulation circuit 24. For example, a red difference signal RY and a blue difference signal B-Y are obtained from the color demodulation circuit 24 and supplied to the matrix circuit 23, respectively. The matrix circuit 23 outputs a red primary color signal R, a green primary color signal G, and a blue primary color signal B.

The red primary color signal R is supplied to an adder _26R1 through a gain adjustment circuit _25R1 , a predetermined voltage E _R1 is applied to this adder _25R1 , and this is added, and is supplied to the first cathode _K1 of the cathode ray tube 1R. Ru. Further, _the red primary color signal R is supplied to the adder 26R ₂ through the gain adjustment circuit 25R ₂ .
A predetermined voltage E _R2 is applied to and supplied to the second cathode K ₂ of the cathode ray tube 1R.
In this case, by adjusting the gain with the gain adjustment circuits 25R ₁ and 25R ₂ and adjusting the cut-off by changing the values of the voltages E _R1 and E _R2 , the output from the first and second cathodes K ₁ and K ₂ is adjusted. The intensities of the first and second beams Bm ₁ and Bm ₂ are made to be the same.

Similarly, the green primary color signal G is transmitted through the gain adjustment circuit 25G ₁
A predetermined voltage E _G1 is applied to the adder 26G ₁ to be added thereto, and is then supplied to _the first cathode K ₁ of the cathode ray tube 1G. Further, the green primary color signal G is transmitted to the gain adjustment circuit 25.
It is supplied to an adder 26G ₂ through G ₂ , a predetermined voltage E _{G 2} is applied to this adder 26G ₂ , and the added voltage is supplied to the second cathode K ₂ of the cathode ray tube 1G. Also in this case, the gain adjustment circuit 25G ₁ , 2
By adjusting the gain with _5G2 and adjusting the cutoff by changing the values of voltages E _G1 and E _G2 , the first
and the first emitted from the second cathodes K ₁ and K ₂
and the second beams Bm ₁ and Bm ₂ have the same intensity.

Similarly, the blue primary color signal B is transmitted to the gain adjustment circuit 25.
The voltage is supplied to the adder 26B ₁ through B ₁ , and a predetermined voltage E _B1 is applied to the adder 26B ₁ , which is then added to the adder 26B 1 and supplied to the first cathode K ₁ of the cathode ray tube 1B. Moreover, the blue primary color signal B is transmitted to the gain adjustment circuit 25.
It is supplied to an adder 26B ₂ through B ₂ , a predetermined voltage E _B2 is applied to this adder 26B ₂ , and the added voltage is supplied to the second cathode K ₂ of the cathode ray tube 1B. Also in this case, the gain adjustment circuits 25B ₁ , 2
By adjusting the gain with _5B2 and adjusting the cutoff by changing the values of voltages E _B1 and B _B2 , the first and second electron beams Bm emitted from the first and second cathodes _K1 and _K2 are ₁ and Bm ₂ are made to have the same intensity.

In addition, in FIG. 7, the video detection circuit 21
The video signal S _V obtained from this is supplied to the synchronization separation circuit 27. The vertical synchronization signal Vsync and horizontal synchronization signal Hsync obtained from this separation circuit 27 are supplied to a vertical deflection circuit 28V and a horizontal deflection circuit 28H, respectively. And these deflection circuits 28V and 28V
Deflection signals S _VD and S _HD from H are cathode ray tubes 1R and 1G.
and 1B to the respective deflection coils 29.

In addition, the synchronization signal obtained from the separation circuit 27
Vsync and Hsync are supplied to a convergence circuit 30. In this convergence circuit 30, for example, as described above, a DC current _SDV and a correction signal _SCV are formed which are supplied to the coil 4c of the vertical convergence yoke 4, and a DC current which is supplied to the coil 5e of the horizontal convergence yoke 5 is generated. Currents S _DH and S _CH are formed. Different ones are formed corresponding to each of the cathode ray tubes 1R, 1G and 1B. These signals are transmitted to cathode ray tubes 1R, 1
G and 1B, for example, are supplied to coils 4c and 5e forming convergence yokes 4 and 5, respectively.

The example in FIG. 7 is constructed as described above, and has a cathode ray tube 1
The first and second cathodes K ₁ and K ₂ of R are supplied with the same red primary color signal R and driven, and
The first and second electron beams Bm ₁ and Bm ₂ from these first and second cathodes K ₁ and K ₂ are scanned simultaneously on the screen in the vertical direction with an interval of 1/2 of the scanning line interval. Ru. Therefore, the scan line is 525
In the case of a book, in the case of a 1-beam system, only 262.5 scanning lines are emitted within one field, but in the case of the example in Figure 7, the remaining scanning lines, which would otherwise be emitted in the next field, emit light in one field.
262.5 scanning lines also emit light, 525 in one field
The scanning line of the book emits light, which causes the red image S _R to be displayed on the screen as described above.

Furthermore, green image S _G and blue image S _B are similarly displayed on the screens of cathode ray tubes 1G and 1B.

According to the example in FIG. 7, cathode ray tubes 1R, 1G and 1
The red image S _R , the green image S _G and the blue image S _B displayed in B are displayed by emitting light from all the scanning lines within one field, so the display period of each scanning line is, for example, 1. /60 seconds, and each of these images S _R ,
You will no longer feel the flicker of the scanning lines in S _G and S _B. Furthermore, since a vertically elongated beam is not used as in the conventional method, there is no possibility of deterioration in vertical resolution. Therefore, according to the example shown in FIG. 7, a good color image can be obtained on a screen (not shown).

However, in the case where the cathode ray tubes 1R, 1G, and 1B are driven by supplying the same signal to the first and second cathodes _K1 and _K2 as in the example in FIG. 7, when there is movement in the image, The disadvantage is that the shaded areas have noticeable step-like distortions, or so-called "jags," which impair visibility.

The reason why this "jar" is noticeable can be explained as follows.

First, consider a screen 100 on which an image having a hatched portion lob as shown in FIG. 19 is displayed. If there is movement in this image, the first field is displayed as shown by the solid line, and the second field is displayed as shown by the broken line. below,
Explanation will be given using an enlarged view of part d of the shaded area lob of this image. First, when there is no movement in the image during normal interlacing, the image becomes as shown in FIG. 20A. In Figure 21, “〇”
The mark indicates the boundary between white and black scanning lines in the first field, and the "x" mark indicates the boundary between white and black scanning lines in the second field. In this case,
The boundary between white and black in an image is perceived as shown by the solid line _l1 . Furthermore, when there is movement in the image during normal interlacing, the image becomes as shown in FIG. In this case, the change from the first field to the second field is perceived, for example, by an arrow. In this case, since the lengths of the arrows, , and , are the same, "jags" are not perceived.

Similarly, in a two-beam system like the example in Figure 7, the first and second beams
First and second cathodes K ₁ according to Bm ₁ and Bm ₂
It is assumed that the same signal is supplied to and K ₂ to drive them.

If there is no movement in the image, it will look as shown in FIG. 20C. In the figure, for example, the upper side of the "O" marks and the "x" marks arranged in the vertical direction are the ones caused by the first electron beam Bm ₁ , and the lower ones are the ones caused by the second electron beam Bm ₂ . In this case,
The boundary between white and black in an image is perceived as shown by the solid line _l2 . Furthermore, when there is movement in the image, the image becomes as shown in FIG. In this case, the change from the first field to the second field is indicated by, for example, an arrow,
, , is perceived. And in this case, arrow, , becomes shorter than arrow,
Since the changes in each scan line are no longer uniform, "jags" are perceived at this time.

Purpose of the Invention The present invention has been made in view of the above points, and is an object of the present invention to alleviate the step-like distortion, so-called "jaggies", that can be felt in the diagonally lined portions of moving images in the two-beam system. be.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention aims to separate electron beams from two cathodes by an interval approximately half the scanning line interval in the vertical direction on a fluorescent surface by means of a correction magnetic field or a correction electric field. In a television receiver configured to be scanned simultaneously while maintaining a fixed position, one of the cathodes is supplied with one scanning line signal, and the other cathode is supplied with the one scanning line signal and its scanning line signal. This is characterized in that the signal obtained by adding and averaging the previous or next scanning line signal is supplied.

The present invention is configured in this way, and the other cathode is supplied with the averaged signal of one scanning line signal and the scanning line signals before or after it. The change from field to field to the second field is felt to be less different in each scan line, and therefore the "jaggies" are alleviated.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to FIG. 21. In FIG. 21, parts corresponding to those in FIG. 7 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In FIG. 21, the red primary color signal R obtained from the matrix circuit 23 is supplied to the adder 32R through a delay line 31R having a delay amount of 1H for one horizontal period, and is also supplied to the first cathode K1 of the cathode ray tube _1R . Supplied. Further, the red primary color signal R is supplied to the adder 32R. And this adder 32
The addition signal from R is set to 1/2 level by a level adjuster 33R and is supplied to the second cathode _K2 of the rear cathode ray tube 1R. In this case, cathode ray tube 1R
The signal supplied to the first cathode K ₁ of is the red primary color signal R of one scan line (scan line before the current scan line), and the signal supplied to the second cathode K ₂ is the red primary color signal R of one scan line (scan line before the current scan line). The average of the red primary color signal R and the red primary color signal R of the subsequent scanning line (current scanning line) is supplied.

In addition, cathodes K ₁ of cathode ray tubes 1G and 1B,
Similarly, K ₂ also has a green primary color signal G and a blue primary color signal B,
Supplied. In Figure 21, 31G and 31
Delay lines B each have a delay amount of 1H, adders 32G and 32B, and level adjusters 33G and 33B each reduce the level to 1/2.

The rest of the structure is the same as the example shown in FIG.

This example is configured as described above, and the first cathode _K1 of the cathode ray tube 1R is supplied with the red primary color signal R of one scanning line, and the second cathode _K2 is supplied with the red primary color signal R of this one scanning line. An average of the primary color signal R and the red primary color signal R of the subsequent scanning line is supplied and driven. And these first and second cathodes
First and second electron beams Bm ₁ from K ₁ and K ₂
and Bm ₂ , all the scanning lines are emitted within one field as in the example of FIG. 7, and thereby a red image S _R ' is displayed on the screen.

Further, the green image S _G ′ and the blue image S _B ′ are similarly displayed on the screens of the cathode ray tubes 1G and 1B.

Here, let's consider the "jags" in this example.

That is, in the case of this example, when there is no movement of the image, the result will be as shown in FIG. 20E. In the figure, the "△" mark indicates, for example, the second electron beam Bm ₂
It has a luminance between white and black, that is, gray. The shaded area _l3 is an area that feels gray. In this case, the boundary between white and black in the image is perceived as this gray area _l3 . Furthermore, when there is movement in the image, it becomes as shown in FIG. In this case, the change from the first field to the second field is, for example, indicated by the arrows ′, ′, ′, ′,
′, arrows ′, ′, ′ are arrows ′,
'Shorter than '. However, considering the gray areas l ₃ ′, l ₃ ″ indicated by diagonal lines, the arrows ′, ′,
' is an arrow ' in figure D (example in figure 7);
, it feels longer and the arrow ′,
' is the arrow in D in the same figure, but it feels shorter. Therefore, changes in each scanning line can be felt without much difference, and "jaggies" can be alleviated.

In this way, according to this example, the cathode ray tubes 1R, 1G
The primary color signal of one scanning line is supplied to the first cathode _K1 of 1B, and the primary color signal of one scanning line and the primary color signal of the subsequent scanning line are added and averaged to the second cathode _K2 . Since the image data is supplied and driven, the change from the first field to the second field will be felt without much difference in each scanning line, and the "jaggedness" will be alleviated.

In this example, the primary color signal of one scanning line is supplied to the first cathode _K1 of the cathode ray tubes 1R, 1G, and 1B, and the primary color signal of one scanning line is supplied to the second cathode _K2 . The signal obtained by adding and averaging the primary color signals of the following scanning lines is supplied _.
The primary color signal of one scanning line (current scanning line) is supplied to the first cathode _K1 , and the primary color signal of one scanning line and that of the previous scanning line (scanning line before the current scanning line) are supplied to the first cathode K1. The signal obtained by adding and averaging the primary color signal may be supplied. In any case, it is necessary to apply the primary color signal with more time-delayed components to the first cathode K ₁ (related to the first electron beam Bm ₁ scanning the upper of the two electron beams). . Although only the cathode ray tube 1R is shown in FIG. 22, the cathode ray tubes 1G and 1B are similarly constructed.

Next, FIG. 23 shows another embodiment of the present invention. In FIG. 23, parts corresponding to those in FIG. 21 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

This example in Figure 23 shows cathode ray tubes 1R, 1G and 1B.
The sum of the luminance signal component and the color difference signal component of one scanning line signal (signal of the current scanning line) is supplied to the second cathode _K2 of the first scanning line signal K2.
The cathode K ₁ contains the averaged sum of the luminance signal component of one scanning line signal and the luminance signal component of the previous scanning line signal (signal of the scanning line before the current scanning line), and The sum of the color difference signal components of the scanning line signal is supplied.

In the figure, a luminance signal/chrominance signal separation circuit 22
The luminance signal Y separated by is supplied to the adder 34, and is also supplied to the adder 34 via a delay line 35 having a delay amount of 1H. The addition signal from the adder 34 is reduced to 1/2 level by the level adjuster 36 and then supplied to adders 37R ₁ , 37G ₁ and 37B ₁ . Further, the luminance signal Y separated by the separation circuit 22 is sent to adders 37R ₂ and 37G ₂
and 37B ₂ .

Further, the color signal C separated by the separation circuit 22 is supplied to a color demodulation circuit 38. From this color demodulation circuit 38, a red difference signal R-Y and a green difference signal G are output.
-Y and a blue color difference signal B-Y are obtained. The red difference signal RY is supplied to adders _37R1 and _37R2 . The addition signals from these adders 37R ₁ and 37R ₂ are applied to the first and second channels of the cathode ray tube 1R, respectively.
cathodes K ₁ and K ₂ . Further, the green difference signal G-Y from the color demodulation circuit 38 is sent to an adder 37.
Supplied to G ₁ and 37G ₂ . The addition signals from these adders 37G ₁ and 37G ₂ are applied to the first and second cathodes K 1 and K ₂ of the cathode ray tube 1G, _respectively .
supplied to Furthermore, the blue difference signal B-Y from the color demodulation circuit 38 is supplied to adders 37B ₁ and 37B ₂ . And these adders 37B ₁ and 3
The summation signals from 7B ₂ are respectively applied to the first cathode ray tube 1B.
and supplied to the second cathodes K ₁ and K ₂ .

The rest of the structure is the same as the example in FIG. 21.

The example in FIG. 23 is constructed as described above, and as described above, the luminance signal component and color difference signal component of one scanning line signal are added to the second cathode _K2 of the cathode ray tubes 1R, 1G, and 1B. At the same time, the first cathode _K1 is supplied with the sum of the luminance signal component of one scanning line signal and the luminance signal component of the previous scanning line signal, and the one scanning line signal. The sum of the color difference signal components is supplied.

According to the example in FIG. 23, the luminance signal component is the same as the example in FIG. 21, but the same color signal component is provided to the first and second cathodes K ₁ and K ₂ . However, the color signal component originally has a narrow band and does not affect the occurrence of "jaggies". Therefore, the above-mentioned 21st
The same style effect as in the illustrated example can be obtained. Furthermore, according to the example in FIG. 23, there is one delay line (three
5), which has the advantage of significantly simplifying the circuit configuration.

In this example in FIG. 23, the color difference signal components supplied to the first and second cathodes K ₁ and K ₂ are those of one scanning line signal, but they may be those of the previous scanning line signal. .

In addition, apart from the example in FIG. 23, as shown in _FIG . At the same time, the second cathode _K2 receives the sum of the luminance signal components of one scanning line and the luminance signal components of the subsequent scanning line signal (signal of the current scanning line). It may also be possible to supply the Also in the example of FIG. 24, the color difference signal components supplied to the first and second cathodes K ₁ and K ₂ are those of one scanning line signal or those of the subsequent scanning line signal.

Effects of the Invention According to the present invention described above, the average of one scanning line signal and the preceding or following scanning line signal is supplied to the other cathode, so that in the diagonally shaded portion of a moving image, , the change from the first field to the second field is perceived as less different in each scan line, and therefore the "jaggies" are alleviated.

[Brief explanation of drawings]

Figures 1 to 18 are diagrams for explaining the conventional example, Figures 19 and 20 are diagrams for explaining the "serrations", and Figure 21 is a configuration showing an embodiment of the present invention. 22 to 24 are configuration diagrams showing other embodiments of the present invention. 1R, 1G and 1B are cathode ray tubes, 23 is a matrix circuit, 31R, 31G and 31B are each
1H delay line, 32R, 32G and 32B are adders, respectively, and K ₁ and K ₂ are first and second cathodes, respectively.

Claims (1)

[Claims] 1. Electron beams from two cathodes are maintained at positions on the fluorescent surface vertically apart from each other by an interval of approximately 1/2 of the scanning line interval by a correction magnetic field or a correction electric field. In a television receiver configured to be scanned simultaneously, one of the cathodes is supplied with one scanning line signal, and the other cathode is supplied with the one scanning line signal and the preceding or following scanning signal. A television receiver characterized in that a signal obtained by adding and averaging a line signal is supplied. 2 One of the cathodes is supplied with the luminance signal component of one scanning line signal regarding the luminance signal component, and with respect to the angle difference signal component, the color difference signal component of the aforementioned one scanning line signal or the scanning line signal before or after it. is supplied to the other cathode, and the luminance signal component obtained by adding and averaging the luminance signal component of the one scanning line signal and the luminance signal component of the scanning line signal before or after it is supplied to the other cathode. 2. The television receiver according to claim 1, wherein the color difference signal component is supplied with the color difference signal component of the one scanning line signal or the preceding or succeeding scanning line signal.