JPS59201583A - Television receiver - Google Patents

Abstract

PURPOSE:To obtain a picture with high quality by forming the 1st and the 2nd signals from a non-interlace signal having a double horizontal frequency and driving two cathodes by means of these signals so as to make line flicker unremarkable. CONSTITUTION:Red, green and blue primary color signals R, G, B, of the interlace system are outputted from a matrix circuit 23 and converted into the 1st and the 2nd non-interlace signals having a double horizontal frequency by double speed two beam converting circuits 25R..., 2-beam converting circuits 26R... and changeover switches 27R..., 28R.... These signals are applied to the 1st and the 2nd cathodes K1, K2 of a cathode ray tube. Simultaneously, a correcting signal is applied to coils 4c, 5e from a convergence circuit 65 and the interval between the 1st and the 2nd electron beams Bm1, Bm2 is kept to a prescribed interval.

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.

That is, when displaying a screen using the interlaced method, when there are 525 scanning lines, one field is composed of 2625 lines, and by transmitting this at 60 Hz, υ-plane flicker is suppressed. In order to obtain vertical resolution, one field is scanned with the next field shifted by the distance between the two scan lines.

However, in this case, even though macroscopically the number of images is 60 per second, microscopically one scanning line lights up every 11 nanoseconds, and the display period is in surface seconds. be. Therefore, the light emission of one scanning line is visually perceived as flicker.

Non-interlaced display is known as a means of eliminating this flicker and obtaining high-quality images. Two methods are known for performing this non-interlaced display.

One method is to convert an interlaced video signal into a non-interlaced video signal with double the horizontal frequency, supply this to a cathode ray tube, double the horizontal scanning speed in this cathode ray tube, and use non-interlaced video signals. It's a display item.

The other method is to simultaneously scan two electron beams from two electron guns on a fluorescent surface in the vertical direction with an interval equal to the scanning line interval, thereby producing a non-interlaced display. .

However, in the case of these methods, 9525 lines are displayed non-interlaced per field (the scanning line locus of the first field and the scanning line locus of the second field match), and 1
The number of lines on the screen in a frame does not increase.

Furthermore, when obtaining a globjector with a large screen, the total number of scanning lines of 525 is insufficient, and the scanning line structure becomes visible, which impedes improvement in image quality compared to the width.

In particular, when using high-resolution cathode ray tubes and lenses, as well as high-quality program sources, in commercial mini-theaters, etc., it is necessary to make the scanning line structure more fine-grained.

OBJECTS OF THE INVENTION In view of the above, the present invention is designed to make it possible to obtain high-quality images with fine lines and fine lines without noticeable line flickers.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention doubles the speed of an input interlaced signal to obtain a non-interlaced signal with twice the horizontal frequency, forms first and second signals from this non-interlaced signal, and Electron beams from two cathodes driven by first and second signals are simultaneously scanned by a correction magnetic field or a correction electric field while maintaining positions separated by a predetermined distance in the vertical direction on the fluorescent surface. It was designed to do so.

The present invention is configured in this way, and the scanning line locus of the first field and the scanning line locus of the second field are made to match, so line flicker is not noticeable. It's a size.
Since the number of scanning lines in the first and second fields is twice that of the conventional one, a finely detailed image can be obtained.

Embodiment Hereinafter, an example in which the present invention is applied to a television receiver constituting a projector will be explained with reference to FIG.

In the figure, (IR), (IG), and (IB) are projection type cathode ray tubes that generate red, green, and blue color images SR, S, and SR, respectively. Although not shown, red, green, and blue color images S8°S generated on the respective screens
The image lights from o and SR are supplied via a projection lens onto a screen in an overlapping manner, and a color image is displayed on this screen.

Cathode ray tube (IR), (IG) and (IB) are each 2
It is of the beam type. That is, the first and second electron beams B and the first and second cathodes Kl related to 8 m2
and are arranged side by side, and the first and second electron beams from the first and second cathodes are directed vertically on the screen.

The images are scanned simultaneously at predetermined intervals (described in detail later).

These cathode ray tubes (IR), (IG) and (IB) are
It is configured as a Trinitron (registered trademark) type as shown in Fig. 2, or as a two-electron gun type as shown in Fig. 3, but in any case, the first and second electron beams are 1 and 2 for the first and second cathodes
It is assumed that the In FIG. 2, G1 to GS are grids, C0Nv is a convergence electrode (electrostatic deflection plate), and DY is a deflection yoke. Also, in Figure 3,
G1-G4 are grids, and DY is a deflection yoke.

In Figures 2 and 3, (3) is a fluorescent surface.

In order to space the first and second electron beams Bm1 and 8m2 apart from each other in the vertical direction on the screen, that is, on the fluorescent surface (3), for example, the first and second electron beams Bm1 and 8m2 A magnetic field of a predetermined magnitude is applied from the outside to the 8 m2 passage.

Consider a case where the first and second cathodes Kl and 2 are arranged in parallel in the horizontal direction. In this case, the deflection yoke D
On the cathode side of Y, the first and second electron beams Bm
4 and 8 m2 apart (therefore, the center of grid G4 in Figure 2 is not possible), a horizontal convergence yoke (4) is arranged in a plane perpendicular to the tube axis, as shown in Figure 4, for example. At the same time, a vertical convergence yoke (5) is provided as shown in FIG. In FIGS. 4 and 5, (6) indicates the neck, x indicates the horizontal direction, and y indicates the vertical direction. The horizontal convergence yoke (4) shown in Fig. 4 includes, for example, cores (4a) and (4b) arranged in the horizontal direction
A coil (4c) is wound in a predetermined direction, a direct current SDH of a predetermined magnitude is passed through the coil (4C), and predetermined magnetic poles are formed on the protruding pieces of the cores (4a) and (4b). It was caused to occur. Core (4a) and (4b)
If the magnetic pole generated on the protrusion is as shown in the figure,
Assuming that a magnetic field as shown by the broken line is generated and the first and second electron beams Bm1 and 8m2 are directed toward the paper (■), these first and second electron beams Bm1 and 8m2
Forces F1H and F2H which are opposite to each other in the horizontal direction are applied to . In this case, by controlling the magnitude of the magnetic field, that is, by controlling the magnitude of the DC current SDH, the force F
1H and F2□ change. In addition, core (4a) and (4
If the magnetic poles generated in the protrusion in b) are opposite to those shown in the figure, the directions of the forces FIH and F2H will be opposite to those shown in the figure. Therefore, by changing the direct current SDH, for example, the first and second electron beams Brn1 and 8m2 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. 5 includes, for example, cores (
A coil (5e) is wound in a predetermined direction around 5a), (5b), (5c) and (5d).
), a DC current SDv of a predetermined magnitude is passed through the core (5
a).

Predetermined magnetic poles are generated on the projecting pieces (5b), (5c), and (5d). , core (5a),
If the magnetic poles generated at (5b), (5c), and (5d) 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 Bml and 8m2 will be directed toward the paper surface. (■), forces F1v and F2v in opposite directions are applied to the first and second electron beams B and 8m2 in the vertical direction y. in this case,
By controlling the magnitude of the magnetic field, that is, the direct current SDv
The forces F1v and F2v change by controlling the magnitude of . In addition, cores (5a), (5b), (5c)
If the magnetic poles generated on the protruding pieces in (5d) are opposite to those shown in the figure, the directions of the forces F1v and F2v will be opposite to those shown in the figure. Therefore, by changing the DC current SDv, for example, the first and second electron beams Bml and Bm! can be spaced apart by a predetermined distance in the vertical direction, for example at the center of the fluorescent surface (3).

In addition, when the first and second cathodes Kl and 2 are arranged in parallel in the vertical direction, the convergence yoke (4) shown in FIG. 4 is rotated by 90 degrees and used for vertical use.
The convergence yoke (5) shown in FIG. It can be used horizontally.

Further, as shown in FIG. 6, by winding a twist coil (7) around the neck (not shown) and passing a direct current SD through it, a magnetic field in the tube axis direction can be generated. Therefore, as shown in FIG. 7, if the direction of the magnetic field from this coil (7) is A, the first electron beam Bml is given a force F11 (■) directed from the paper surface, and the second electron beam A (■) force F12 directed toward the paper surface is applied to Bm2. Therefore, this coil (7) is used instead of a vertical convergence yoke in the case where the coils 1 and 2 are horizontally paralleled to the first and second cathodes. In the case where two convergence yokes are arranged in parallel in the vertical direction, it can be used instead of a horizontal convergence yoke.

Note that, depending on the assembly accuracy of the deflection yoke DY and the electron gun, unique misconvergence usually occurs in each cathode ray tube. Therefore, in this example, FIGS.
As shown by the broken line in the figure, the correction signal S is generated together with the DC currents SD□ and SDv. 0. and Scv are passed through the coils (4C) and (5e), and the first and second electron beams Bm and 8m2 are directed in the horizontal direction X over the entire surface of the fluorescent surface (3).
are corrected so that they are at approximately the same position and separated by a predetermined distance in the vertical direction y.

The correction signal 5C1 (and Scv are made to differ depending on the mode of miscomparison).

For example, if a horizontal misconception as shown in FIG. 8A occurs, the correction signal Scm is a sawtooth wave current having a period of one vertical period (1■) as shown in FIG. 9A. is supplied. In FIG. 8, the "x" and "○" marks indicate the first and second electron beams Bm1 and Bm8, respectively.
This shows m2. As described above, the first and second electron beams Bm and 8m2 are located at approximately the same position on the fluorescent surface (3) in the horizontal direction X, and at a predetermined interval in the vertical direction y. However, in FIG. 8, for convenience, the first and second electron beams Bm and Bm2 are shown as being at the same position both in the horizontal and vertical directions. In addition, when a horizontal misconvergence as shown in FIG. 8B occurs, a nocella boola wave current having a period of 1 V as shown in FIG. 9B is not supplied as the correction signal ScH. When horizontal misconvergence as shown in FIG. 9C occurs, one horizontal period (I) as shown in FIG.
A sawtooth current having a period of H) is supplied. Also,
When horizontal misconvergence as shown in Figure 8 occurs, the correction signal S is used. As R, a laboratory wave current having an IH period as shown in Figure 9 is supplied. In addition, when horizontal misconvergence as shown in FIG. 8E occurs, the correction signal ScH is a waveform obtained by integrating a sawtooth wave with a period of 1V and a sawtooth wave with a period of IH as shown in FIG. 9E. current is supplied. When horizontal misconvergence as shown in FIG. 8F occurs, a current having a waveform integrated with that shown in FIG. 9E is supplied as shown in FIG. 9F. Note that these are typical, and in reality, the current waveforms in each of the above cases are combined to form the correction signal ScH.

The above is the correction signal S. As mentioned above, the correction signal S. The same can be said of V.

In addition, the correction signal S. H and Scv are the correction signals Sc at each part of the fluorescent surface stored in the memory, as shown in FIG.
H and S. It is also possible to write V in advance and sequentially read and supply it corresponding to the scanning positions of the first and second electron beams Bml and 8m2. In FIG. 10, (8) is nfH (n is 5 to 5, for example
A signal generator is shown which generates a frequency signal with an integer of 0 (the horizontal frequency), from which a signal with a frequency of nfH is supplied to a counter (9) forming a read address signal. In addition, (IO indicates a signal generator that generates a frequency signal of f□, and a signal of a frequency of fH other than this is supplied to a counter α which forms a read address signal, and a reset signal is sent to a counter (9). Supplied as.

Also, the vertical synchronization signal Vs is connected to the terminal (lriyoshi counter Q)
ync is supplied as a reset signal. Counter (9)
) and 0η, the electron beam Bm4 in Figs. 1 and 2
A read address signal corresponding to the scanning position of 8 m2 is obtained, and this is supplied to memory 0:3. memory 0
3, a correction signal S corresponding to the scanning position of the first and second electron beams Bml and 8 m2; H and Scv are written in advance 9, and these are sequentially read out based on the address signal.

This read correction signal S. After being latched by the H and Scv latch circuit (14), it is converted into an analog signal by the D-A converter αq, and further passed through the low noise filter (16).
H), (16'V) and 77no (17H), (
17V) are supplied to the horizontal convergence yoke (4) and vertical convergence yoke (5).

Incidentally, depending on the design of the cathode ray tube, the above-mentioned direct currents SDV and SDH may not be necessary. For example, the first and second
Candos Kl and 2 are arranged in parallel in the horizontal direction, and the first and second electron beams Bml and 8m2 are arranged at approximately the same position in the horizontal direction, for example at the center of the fluorescent surface (3). In this case, the current SDH is not required.

Further, for example, the first and second cathodes 1 and 1 are arranged in parallel in the vertical direction, and the first and second electron beams Bml and 13m2 are emitted approximately in the horizontal direction at the center of the fluorescent surface (3), for example. If they are placed at the same position and at a predetermined interval in the vertical direction, the direct currents SDH and SDv are unnecessary.

Moreover, the above describes the first and second electron beams Bml and Bm.
Although the magnetic vertical convergence yoke (5), horizontal convergence yoke (4), or twist coil (7) are used to control the scanning position of the Horizontal and vertical correction plates are provided perpendicularly to each other, and a control voltage is applied to these to correct the first and second electron beams Bm1 and Bm.
The electrostatic cathode ray tubes (IR), (IG) and (IB) are configured as described above, and the first and second scanning positions are respectively
cathode K.

and 2 are supplied with red, green and blue signals for non-interlaced display.

That is, in FIG. 1, ``a'' is an antenna, ``r19'' is a tuner, ``A'' is an intermediate frequency amplifier, and ``Q]'' is a video detection circuit. Video detection circuit I2)
The M number Sv is supplied to a luminance signal/chrominance signal separation circuit v4. Then, the divine degree signal Y obtained from this separation circuit (a)
is supplied to the matrix circuit @. Further, the color signal C obtained from the separation circuit (c) is supplied to the color 1v tone circuit (c). From this color demodulation circuit (c), for example, a red difference signal R-
The Y and blue difference signals B-Y are obtained and supplied to the matrix circuitry, respectively. A red primary color signal R1, a green primary color signal G, and a backstroke color signal B are outputted from the matrix circuit ◆.

The red primary color signal R is supplied to a double-speed two-beam conversion circuit (25R) and a two-beam conversion circuit (26R). From the output side of the conversion circuit (25R), the first and second double-speed 2-beam converted red signals R1 and R2 are obtained, and are supplied to the fixed terminals on the S side of the changeover switches (27R) and (28R), respectively. Ru. In addition, first and second two-beam conversion signals R4 and Saki are obtained from the output side of the conversion circuit (26R), and are supplied to the H side fixed terminals of the changeover switches (27R) and (28R), respectively. . These changeover switches (27R) and (28R)
), the video signal Sv is a normal video signal (for example, if the scanning line is 5
25 interlaced video signals), it is switched to the S side, and these selector switches (27R)
and (2 Nagigo), signals R1 and R2 are obtained, respectively.

On the other hand, these changeover switches (27R) and (28R) switch the video signal Sv to a high-quality video signal (for example, if the scanning line is 11
25 interlaced video signals), the switch is switched to the H side, and signals R1 and R'2 are obtained from these changeover switches (27R) and (28R), respectively.

The signals obtained from the changeover switches (27R) and (28R) are applied to the first and second cathodes of the cathode ray tube (IR) through amplifiers (29R) and (30R), respectively.
supplied to

The conversion circuit (25R) (which normally operates effectively when receiving a video signal) is configured as shown in FIG. 11, for example.

In the same figure, the red primary color signal R (shown in FIG. 12A, is of an interlaced type with 525 scanning lines,
The attached number is an erosion line number) is supplied to the input terminal, and this red primary color signal R is supplied to the double speed conversion circuit 02.

The double speed conversion circuit 0 is configured as shown in FIG. 13, for example. In the same figure, c33 indicates an input terminal,
A red primary color signal R is supplied to this input terminal C3→. In addition, (b) and 09 are line memories, respectively, and the write clocks CLKw and m[
The output clock CLKR is set by the changeover switch c37) and Q.
Supplied through l+gold. In this case, the clock CLKR
is set to twice CLKw, so that the read speed is twice as high as the one write speed.

In addition, 0 Buddha and 01 are respective changeover switches, and IH (
The state is switched every (one horizontal period). When the changeover switch 0 is switched to the memory (b) side, the changeover switch θO is switched to the memory 0 side. In this case, the changeover switches (371 and G8 are respectively switched to the states shown in the figure), and the memory (b) is supplied with the write clock CLKw, and the memory 09 is supplied with the read clock cLKR.

On the other hand, the selector switch (b) is set to memory c! When it is switched to the 19 side, it is switched to the selector switch (40 is the memo 1) (GJ) side.

In this case, the selector switches C37) and (C35vc) are switched to the opposite states from those shown in the figure, and the memory 0 is set to the read clock CLKR, and the memory C35vc is set to the write clock CLKR.
LKW is supplied.

In the double speed conversion circuit GZ, the Tochihara color I No. 8 R supplied to the input terminal c31 is alternately applied to the memory (to) and ζ sand, and this memory
and c3→, the IH portion of the red primary color signal 1 written in the IH of the other BiJ is read out twice in succession. Therefore, in this case, from the changeover switch (4υ), the video signal of each short line of the red primary color signal R is 1! A double-speed conversion IH rl (shown in FIG. 12B) in which the horizontal frequency is doubled is obtained, which is repeated twice with a period of -H,
This is supplied to output terminal 1]).

In the conversion circuit (25R) shown in FIG.
Signal r2 (first
(Illustrated in Figure 2C) is obtained.

This signal r2 is adjusted to 7 levels by the level adjuster 0J and then supplied to the adder (2). Further, the U: signal rl is supplied to this adder H1 after being converted into a level by a level adjuster Rira. The additive 6 signal from this adder (G) is iI/・
For example, a delay line consisting of a 2-line memory and having a delay time of THX2 (via 46I, and the output terminal has a delay time of THX2)
A first double-speed 2-beam converted red signal 4ft□ as shown in FIG. 2E is obtained.

Further, the signals r1 and r2 are supplied to an adder, and the added signal is set to two levels by a level adjuster 11, and a signal r3 as shown in Fig. 12 is outputted. This other issue r3
is fed to the adder after being passed through a delay line having a delay time of HHX2. Further, the added signal from this adder (signal r2 is supplied to 5D, this adder 45) is set to a raw level by a level adjuster, and is output to the output terminal 6 as shown in FIG. 12F. The second double-speed 2-beam conversion red light number R2 is obtained.

Further, the conversion circuit (26R) (which operates effectively when receiving a high-quality image signal) is configured as shown in FIG. 14, for example.

In the figure, ■ is the red primary color signal R (shown in Figure 15A,
This terminal is an interlaced type with 1125 running lines, and the numbers assigned are the running line signals. The red primary color signal R supplied to this terminal is passed through a delay line having a delay time of 91 H (one horizontal period), for example from a line memory, and is supplied to the output terminal □□□ as shown in FIG. 15B. A first two-beam conversion signal Rf like this is obtained. The decimated red primary color signal R and the signal set are supplied to an adder φ, and the second two-beam converted signal R6 as shown in FIG.

In FIG. 1, the green primary color signal G is supplied to the double-speed 2-beam conversion circuit (25G) and the 2-beam conversion circuit (26G), and the blue primary color signal B is supplied to the double-speed 2-beam conversion circuit (25G).
B) and the 2-beam conversion circuit (26B). Conversion circuits (25G) and (25B) fl"j are configured similarly to the conversion circuit (25R) described above. Conversion circuit (25
1st and 20th double beam conversion green signals G1 and G2 are obtained from the output side of
G) and (28G) are supplied to the S side fixed terminals.

In addition, first and second double-speed 2-beam converted blue signals Bl and B2 are obtained from the output side of the conversion circuit (25B), and are supplied to the fixed terminals on the S side of the changeover switches (27B) and (28B), respectively. I can do it.

Further, the conversion circuits (26G) and (26B) are configured similarly to the conversion circuit (26R) described above. Conversion circuit (26
The first and second 2-beam conversion green signals G1 and G6 are obtained from the output side of G), and the respective changeover switches (27G)
and (28G) are supplied to the H side fixed terminal. Also,
The first and second 2-beam converted blue signals B1 and B/ are obtained from the output side of the conversion circuit (26B), and are supplied to the H side fixed terminals of the changeover switches (27B) and (28B), respectively. be done.

The changeover switches (27G), (27B), (28G), and (28B) are each switched to the S side when receiving a normal video signal, and are switched to the H side when receiving a high-quality video signal.

The signals obtained from the changeover switches (27G) and (28G) are sent to the cathode ili! through amplifiers (29G) and (30G), respectively. 1 and 2 are supplied to the first and second cathodes of the IL tube (IG). In addition, a changeover switch (27B
) and (28B) are respectively input to the amplifier (
29B) and (30B), the first and second cathodes of the cathode ray tube (IB). In FIG.

This separation circuit - horizontal synchronization signal HB'lnC obtained by
is supplied to the H-side fixed terminal of the selector switch 6p, and the horizontal synchronizing signal H3ync is supplied to the multiplier.
A signal H8yn'c which is multiplied by 2 from the multiplier O is obtained and is supplied to the fixed terminal on the S side of the changeover switch I◇. This changeover switch is switched to the S side when receiving a normal video, and switched to the H side when receiving a high quality video signal. The synchronization signal obtained from this switch circuit (6]) is supplied to the horizontal deflection circuit (63H). In addition, the separation circuit
The vertical synchronization signal ■5ync that can be obtained is the vertical deflection circuit (
63V). Deflection signals SHD and SvD from these deflection circuits (63H) and (63V) are applied to the deflection coils of cathode ray tubes (IR), (IG) and (IB), respectively.
supplied to

Also, the vertical synchronization signal V, ync obtained by the separation circuit
The synchronizing signal obtained from the switching mechanism and the switching circuit is supplied to a convergence circuit. In this convergence circuit, as mentioned above, the DC current SD that is supplied to the coil (5e) of the vertical convergence yoke (5) is
'/ and correction signal Scv are formed, and at the same time, DC current SDR and correction signal SCH supplied to the coil (4c) of the horizontal convergence yoke (4) are formed. Different ones are formed corresponding to each of the cathode ray tubes (1tt), (IG), and (IB). These signals are sent to the coils (4c) of the cathode ray tube (IR), (IG) and (IB).
) and (5e), respectively. In this case, when receiving a normal video signal, for example, the first and second cathodes K may be adjusted by adjusting the signals SDv+Scv and SDH+SCB.
The first and second electron beams BmI and Bm2 from 1 and 2 are scanned vertically on the fluorescent surface at an interval of 7, which is the scanning line interval in an interlaced system (normal video signal). be done.

On the other hand, when receiving high-quality video signals, these first and second
The electron beams Bml and Bm2 are scanned in the vertical direction on the fluorescent surface with an interval of 1 equal to the ground scanning line interval in an interlaced system (high-quality video signal).

In addition, the vertical synchronization signal ■8yn0 obtained from the separation circuit
The synchronizing signal obtained from the switch circuit O and the switch circuit O is supplied to the vertical deflection shift circuit. This shift circuit normally operates only when receiving a video signal. The vertical deflection circuit (63V) is controlled by the output of this shift circuit (2), and the vertical scanning positions of the first and second electron beams Bml and Bm2 on the fluorescent surface are adjusted to 7H as shown in FIG.
It is alternately shifted upward or downward every period. The shift amount d is set to an interval of 1 scanning line interval in the interlace method. Also, this shift starts from the top in the first field, and from the bottom in the second field.

The present example is configured as described above, and when normally receiving a video signal, the changeover switches (27R) and (28R) are respectively switched to the S side, and the first and second cathodes Kl and Cathode of the cathode ray tube (IR) are connected to each other. First and second double-speed two-beam converted red signals R1 and R2 are respectively supplied to the two-beam conversion red signals R1 and R2.

At this time, the changeover switch θ is switched to the S side,
A synchronizing signal H1lyn:L is supplied to the horizontal deflection circuit (63H) by the changeover switch 0I), and horizontal deflection scanning is performed at double speed. Furthermore, at this time, the first and second cathodes K
First and second electron beams Brr+4 from l and 2
and Bm2 are set to an interval of 1 of the scanning line interval of the interlaced system (in a normal video signal) on the fluorescent surface, and the shift circuit operates.

Therefore, scanning lines are formed on the fluorescent surface of the cathode ray tube (IR) in the first and second fields as shown in FIG. 17. In the figure, what is shown by a solid line is due to the first electron beam Bn·l, what is shown by a broken line is what is due to the second electron beam Bm2, and what is shown by the broken line is due to the first electron beam Bn·l.
The scanning line trajectories of the field and the second field match.

The same applies to cathode ray tubes (IG) and (IB).

Figure 18 shows the scanning lines formed on the fluorescent surface in the conventional interlaced method, and Figure 19 shows the fluorescent light when the conventional horizontal scanning speed is doubled and non-interlaced display is performed. It shows scanning lines formed on a surface.

As is clear from the above, in this example, the scanning line trajectories in the first field and the second field match, so line flicker is not noticeable. Since the number of scanning lines in one frame is approximately twice that in the examples shown in FIGS. 18 and 19, it is possible to obtain an image with a fine-grained scanning line structure.

Therefore, in this example, a high quality image can be obtained.

Further, in this example, when receiving a high-quality video signal, the changeover switches (27R) and (28R) are respectively switched to the H side, and the first and second cathodes of the cathode ray tube (IR) are connected to the first and second cathodes, respectively. 1 and 2nd 2-beam conversion red mark RI
' and R2 are supplied. At this time, the changeover switch (61) is switched to the H side, and the horizontal deflection circuit (63H)
A switch circuit (6) is supplied with a synchronizing signal H9ynC to perform horizontal deflection scanning.Furthermore, at this time, the first
The first and second electron beams Bml and Bm2 from the second cathode and the second cathode and the first and second electron beams Bml and Bm2 are arranged on the fluorescent surface at an interval of Σ, which is the scanning line interval of the interlace method (in high-quality video signals). Note that the shift circuit does not operate.

Therefore, scanning lines are formed on the fluorescent surface of the cathode ray tube (IR) in the first and second fields as shown in FIG. In the same figure, what is shown by the solid line is due to the first electron beam Bm1, and what is shown by the broken line is due to the second electron beam Bm2, and the scanning line trajectories of the first field and the second field are the same. Become something.

The same applies to cathode ray tubes (IG) and (IB).

FIG. 21 shows scanning lines formed on a fluorescent surface in the conventional interlace method.

As is clear from the above, in this example, the scanning line trajectories in the first field and the second field match, so line flicker is not noticeable.

In the above embodiment, the double-speed 2-beam conversion circuit (25
R), (25G) and (25B) are configured as shown in the example in Fig. 11, but
Instead of this, a configuration as shown in FIGS. 22 to 24 can also be used. Conversion circuit (25R).

Since (25G) and (25B) have the same configuration, only the conversion circuit (25R) will be described below.

In FIG. 22, @no is an input terminal to which the red primary color signal R (shown in FIG. 25A) is supplied, and this red primary color signal R
is, for example, 1 vertical period (1v
), a signal r4 (shown in FIG. 25B) delayed by 1v is obtained. Further, the red primary color signal R and the signal r4 are supplied to the double speed conversion circuit (A) and C7*, respectively. These double speed conversion circuits and 70 are the double speed conversion circuits (321 (13th
(see figure). Therefore, double speed conversion circuit O
Double speed conversion signals r5 (shown in FIG. 25C) and r6 (shown in FIG. 25) are obtained from Q@ and Q@, respectively. These signals r and r6 are applied to the adders υ) and ), respectively.
It is also supplied to one and the other fixed terminals of the changeover switch 173. This changeover switch (c) is -! -H, and the first of consecutive signals is extracted from each of signals r and r6. Therefore,
A signal T7 as shown in FIG. 25E is obtained from this changeover switch f3, and is supplied to adder ) and 172. The addition signal from the adder (c) is sent to the level adjuster (7).
4), the output terminal (7) is connected to the first double-speed 2-bit signal as shown in FIG. One-mum conversion red signal R8 is obtained.Ushida, adder (7])
A second double-speed 2-beam converted red signal R3 as shown in the 8-level diagram G is obtained from the addition signal from .

Even when using the conversion circuit (25R) in the example shown in Fig. 22, when receiving a normal video signal, the first and second candos
and the first and second electron beams BmI and 8 from 2 and 8
m2 is scanned in the vertical direction on the fluorescent surface while maintaining an interval of 7, which is the scanning line interval in the interlaced system (normal video signal).

Still, the shift circuit wheel is also activated and the vertical scan position is as shown in FIG.

When using the conversion circuit (25R) in the example shown in Fig. 22,
During normal signal reception, scanning lines are formed on the fluorescent surfaces of the cathode ray tubes (1-R), (IG) and (1B) as shown in FIG. In the figure, what is shown by a solid line is due to the first electron beam BmI, and what is shown by a broken line is due to the second electron beam Bm2,
The scanning line trajectories t of the first field and the second field coincide.

In Figure 23, (7 [present] is the red primary color signal R (
This red primary color signal R is supplied to the double speed conversion circuit (2).

This double speed conversion circuit ■ is the double speed conversion circuit 0;! J(
(see FIG. 13), and a double speed conversion signal rB (shown in FIG. 28B) is obtained from its output side. This signal r8 is passed through a delay line 6] which has a delay time of TH, such as that of a line memory, and this delay line 6])
An error signal r9 (shown in FIG. 28C) is obtained.

This signal r is supplied to six adders and (g). Still, this signal rg is 1H from the line memory, for example.
is passed through a delay line having a delay time of , and a signal rho (shown in Figure 28) is obtained through this delay line.
This is supplied to the controller. Adder (a)
The addition signal from the left is set to a high level by the level adjustment 6 (c), and the output terminal ■ has the first double speed 2 as shown in FIG.
A beam converted red signal R1 is obtained. Further, the signal r8 is supplied to the adder a2. The addition signal from this adder (c) is set to the Σ level by the level adjuster (c), and the signal r
11 (shown in FIG. 28E) is obtained, which is supplied to the adder. The addition signal of this adder (to) is set to Σ level by the level adjuster (to), and the output terminal (a) is connected to the 28th signal.
Second double-speed 2-beam conversion red signal R1 as shown in Figure G
is obtained.

When using the conversion circuit (25R) of this example in Fig. 23,
For example, the signal sDH1s between the convergence circuits.

H2SDv10S. By adjusting V, when receiving a normal image signal, the first and second beams Brr+4 and 8m2 maintain a spacing of - of the scanning line spacing in the interlaced method (normal video signal) in the vertical direction on the fluorescent surface. made to scan. And in this case the operation of the shift circuit branch is stopped and the first and second electron beams Bml and Bml
The vertical scanning position of is as shown in FIG.

When the conversion circuit (25R) i in the example shown in Fig. 23 is used, when receiving a normal video signal, the cathode ray tube (IR), (],
Scanning lines are formed on each of the fluorescent surfaces of G) and (IB) as shown in FIG. In the figure, what is shown by a solid line is due to the first electron beam BmI, and what is shown by a broken line is due to the second electron beam Bm2.

Then, the scanning line trajectories of the first field and the second field match.

Still, in Fig. 24, 0υ is the red primary color signal R (31st
This red primary color signal R is supplied to the double-speed conversion circuit Oa, and is also supplied to the double-speed conversion circuit Oa through a delay line 0 having a delay time of, for example, IV, as compared to the field memory. Supplied to the conversion circuit (goods). The double-speed conversion circuits Oe and 0Φ are each configured similarly to the above-mentioned double-speed conversion circuit (32i (see FIG. 13). Therefore, the double-speed conversion circuits @ and 0Φ output the double-speed conversion signals r
1□ (shown in FIG. 31B) and r13 (shown in FIG. 31C) are obtained. These signals rl□ and r13 are supplied to one and the other fixed terminals of the changeover switch OQ.

This selector switch O [present] is switched for each TH, so that the second consecutive signal is extracted from each of the signals r12 and r13. Therefore, this selector switch (G)
From this, a signal as shown in Figure 31 is obtained, and this is obtained as the first double-speed 2-beam converted red signal R1 at the power terminal (G).

Further, the signals r12 and r, 13 are each supplied to an adder (a). Then, the added signal is converted to a level by a level adjuster), and a second double-speed 2-beam converted red signal R2 is obtained at the output terminal (A) as shown in FIG. 31E.

Even when using the conversion circuit (25R) in the example shown in Fig. 24, the convergence circuit (Shingetsu 5ton + 5oH1S from 6G) is similar to the case in which the example shown in Fig. 23 is used.
By adjusting Dv+Sov, when receiving a normal video signal, the first
The second electron beams Bm1 and Brr+4 are caused to scan the fluorescent surface in the vertical direction at an interval of 7, which is the scanning line interval in the interlaced system (normal video signal). In this case as well, the operation of the shift circuit is stopped, and the vertical scanning positions of the first and second electron beams BmI and Bm2 are set as shown in FIG.

When using the conversion circuit (25R) of this example in Fig. 24,
When receiving normal video signals, a cathode ray tube (IR) is used.

Scanning lines are formed on the fluorescent surfaces of (1 and (IB)) as shown in FIG. What is shown is due to the second electron beam Bm2.

Then, the scanning line trajectories of the first field and the second field match.

As described above, the conversion circuits (25
Even if R) is used, the scanning line trajectories in the first and second fields match and the number of scanning lines is approximately twice that of the conventional one, so the conversion circuit (25R) shown in the example in Figure 11 is used. In addition, in the above embodiment, a 2-beam conversion circuit (26R
), (26G) and (26B) are configured as shown in the example in Figure 14, but instead of this, a configuration as shown in Figure 34 may be used. . Since the conversion circuits (26R), (26G) and (26B) are configured in the same way, only the conversion circuit (26R) will be described below.

In the figure, (100) is the red primary color signal R (Fig. 35A
(shown in the figure) is the input terminal to which the input terminal is supplied. This terminal (10
The red primary color signal R supplied to the red primary color signal R is, for example, passed through a delay line (101) having a delay time of IH, which is similar to that of a line memory, and the red primary color signal R supplied to the output terminal (102) has a first A two-beam converted red signal R/l is obtained. It's sweet.
The red primary color signal R is, for example, from a field memory and has a voltage of 1V.
(1 vertical period), and a second 2-beam converted red signal R,/ as shown in FIG. 35C is obtained at the output terminal (104). .

Even when the conversion circuit (2'6R) i in the example shown in Fig. 34 is used, the first and second electron beams Bm1 and Bm2 are vertically interlaced (high-definition) on the fluorescent surface when receiving high-definition video signals. Scanning is performed while maintaining an interval of 1 of the scanning line interval in the video signal).

When using the conversion circuit (A) of the example in Fig. 34, when receiving a high-quality video signal, the cathode ray tube (IR) '+ (I
Scanning lines are formed on each of the fluorescent surfaces of G) and (IB) as shown in FIG. In the figure, what is shown by a solid line is due to the first electron beam Bml, what is shown by a broken line is due to the second electron beam Bm2,
The scanning line trajectories of the first field and the second field match. Therefore, the conversion circuit of the example in FIG. 34 (
26R), the conversion circuit shown in the example in Figure 14 (
26R) can be obtained.

Effects of the Invention According to the present invention described above, the scanning line locus of the first field and the scanning line locus of the second field are made to match, so line flicker is not noticeable. Furthermore, since the number of scanning fields in the first and second fields is approximately twice that of the conventional one, it is possible to obtain fine-grained images.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram showing one embodiment of the present invention, Figures 2 to 10
Figures 1 and 11 are diagrams for explaining the cathode ray tube of the example shown in Figure 1 and 11, respectively.
The figure is a block diagram showing an example of a double-speed 2-beam conversion circuit.
13 is a block diagram showing an example of a double speed conversion circuit, FIG. 14 is a block diagram showing an example of a 2-beam conversion circuit, and 15 (2) is for explanation. Figure 1
Figure 6 shows the electron beam Bml and Sm2 when using the example in Figure 11.
17 is a diagram showing the scanning lines formed when using the example of FIG. 11, FIGS. 18 and 19 are diagrams showing the scanning lines formed in the conventional example, and FIG.
The figure shows scanning lines formed when using the example shown in Fig. 14, Fig. 21 shows scanning lines formed in the conventional example, and Figs. 25, 28, and 31 are diagrams for explaining the examples in FIGS. 22, 23, and 24, respectively, and FIGS. 26, 29, and Figure 32 shows the electron beam Bml when using the example in Figure 22, the example in Figure 23, and the example in Figure 24, respectively.
and Figures 27 and 30 showing the vertical scanning position of 8m2.
Figures 22 and 33 are examples of Figures 22, 23, and 2, respectively.
4 is a diagram showing scanning lines formed when the example is used, FIG. 34 is a configuration diagram showing another example of the 2-beam conversion circuit, FIG. 35 is a diagram for explaining the same, and FIG. FIG. 6 is a diagram illustrating scan lines formed when using the illustrated example. (IR) (IG) and (IB) are cathode ray tubes, (A) is a matrix circuit, (25R) (25G) and (2
5B) are double-speed two-beam conversion circuits, (B) are convergence circuits, K1 and 2 are first and second candos, respectively, and Bml and Brn2 are first and second electron beams, respectively. Agent Sada Ito ■Copy. Same Hidemori Matsukuma'-1
1: Figure 2 Figure 3 810 Figure 4 Figure 5 Calculation Figure 6 Figure 7 Figure 8 Figure 9 Figure 20 Figure 21

Claims (1)

[Claims] 1. Double-speed converting the input interlaced signal to obtain a non-interlaced signal with twice the horizontal frequency, form first and second signals from this non-interlaced signal, and form first and second signals from the non-interlaced signal. The electron beams from the two cathodes driven by the signal are simultaneously scanned on the fluorescent surface while maintaining positions vertically separated by a predetermined distance by a correction magnetic field or a correction electric field. television receiver. 2. The television receiver according to claim 1, wherein the predetermined interval is equal to the interval between scanning lines of adjacent horizontal period signals of the input interlaced signal. 3. The television receiver according to claim 1, wherein the predetermined interval is a false interval between scanning lines of adjacent horizontal period signals of the input interlaced signal.