JPS58223992A - Color television receiver - Google Patents

Abstract

PURPOSE:To obtain a bright video by the scanning with fluorescent lines having different colors provided at both sides of two index lines and two electron beams. CONSTITUTION:The index line for an odd number field continuous along the horizontal scanning direction and the index line for an even number field are arranged alternately toward the vertical scanning direction and the color fluorescent lines having different colors are arranged along both sides of the index lines to constitute a screen. This screen is scanned with two electron beams and the two electron beams are landed on each fluorescent line at both sides of the index lines for each field based on the index signal obtained from the index line and the color is switched at each index line, allowing to perform interlace scanning of the two electron beams.

Description

DETAILED DESCRIPTION OF THE INVENTION With regard to a color television receiver, in particular, a color of a novel configuration in which two electron beams are scanned to reproduce a line-sequential color image by simultaneous emission of two colors. Regarding television receivers.

Generally, in a color television receiver, a color image is reproduced by scanning a screen coated with a color-containing phosphor that emits the three primary colors of red, green, and blue using one or three electronic beams. Various configurations have been proposed.

Incidentally, an index line is provided on the screen that provides an Intex signal indicating the scanning position of the electron beam, and each color band light body is scanned point by point with one electron beam, and the color switching of the electron beam is controlled by the Intex signal. In color television receivers using so-called heme index tubes, which are based on
Since it is necessary to perform color switching at a high frequency of about 0 MHz and pulse drive the electronic beam, unnecessary radiation interference is large and it is difficult to sufficiently increase the brightness of the image. In addition, in an Anthromeda tube that uses three electron beams to simultaneously scan each color band triblet, it is extremely difficult to accurately land the three electron beams on each color band triblet. In other words, in the 3-beam type Anthromeda tube, in order to compensate for the landing of the central beam among the three electron beams, it is necessary to make the spacing between the three electron beams symmetrical. Moreover, if the above-mentioned interval is too wide, there is a drawback that the central beam causes other colors to be emitted.

In view of the above-mentioned problems, the present invention alternately arranges index lines for odd-numbered fields and index lines for even-numbered fields that are continuous along the horizontal scanning direction in the vertical scanning direction. A screen with different colored light strip lines arranged along both sides of the screen is scanned by two electron beams, and the two electron beams are It lands on each color band line on both sides of the index line for each field, and the color is switched for each index line, and a line-sequential color image is created by two-color circumferential emission using interlace scanning of two electronic beams. The present invention provides a color television receiver with a novel configuration that performs reproduction.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1 showing an embodiment of a color television receiver according to the present invention, first to third signal input terminals 1, 2
．． 3 shows the color signal B It IF of the color television signal demodulated by a tuner circuit (not shown); (3
1EB is supplied.

The above color signals EH, EG, EB are sent to the first color switching circuit 4.
and the second color switching circuit 5, and each color switching circuit 4,
5, the signal is converted into two color signal sequences. Here, each color switching circuit 4, 5 receives each color signal ERH every horizontal period IH by a switching pulse from the color switching pulse generator 11.
Ea and EB are selected sequentially, and the first color switching circuit 4 repeatedly selects and outputs each color signal ER, EB, and Ea in the order of red signal ER, blue color value B, and green signal EO, and then The color switching circuit 5 repeatedly selects and outputs each color signal Ea, ER, and En in the order of green signal EG1, red signal ER1, and evening color signal En. That is, each switching circuit 4.5 has a red signal En, a green signal EG, a blue signal En and a red signal E++,
It outputs two simultaneous color signal trains in the order of green signal EG and blue signal EB.

The color signal train (hereinafter referred to as first video signal V1) obtained via the first color switching circuit 4 is supplied to the first video output circuit 7 via the first flanking circuit 6. be done. Further, the color signal train (hereinafter referred to as second video signal 2) obtained through the second color switching circuit 5 is sent to the second video output circuit 9 through the second flanking circuit 8. supplied to

Each of the flanking circuits 6 and 8 is provided with a flanking pulse B as shown in FIG.
The blanking pulse BLK causes each video signal V, , V2 to have 1
Blanking processing is performed every 1-1.

The name of the first video output circuit to which the first video signal is supplied via the first blanking circuit 〒 is the second The first line white pulse LMP+ as shown in FIG.
A carrier wave f of MHz is supplied, and the first line white pulse LWP I is superimposed on the first video signal l during the blanking period TBLK, and the carrier wave -f is supplied with a small constant level. Apply brightness modulation. Further, the second video output circuit 9 has a second video output circuit 9 as shown in FIG.
A line white pulse LWP2 is supplied from the control pulse forming circuit 12, and a carrier wave f having a delayed phase of -60° is supplied from the carrier wave oscillator 13, and a blanking signal is added to the second video signal (2). During the period 'rBLK, the second line white pulse LWP2 is superimposed, and the carrier wave f is used to perform slight brightness modulation at a constant level.

The first video signal V1 is then supplied to the first electron gun 21 of the color cathode ray tube 20 via the first video output circuit 7. Further, the second video signal V2 is supplied from the second video output circuit 9 to the second electron gun 22 of the color Fraun tube 20.

The color fluorine tube 20 in this embodiment includes a screen 23 having a structure as schematically shown in FIGS. 3 and 4. In other words, the screen 23 of the color fluoro tube 20 has a red R band formed horizontally on the back of the front glass.
Each color band stripe 31, 32.33 coated with 1 green G1 blue B color phosphor is separated between these color band stripes 31, 32, 33, and -1 to band 3.
4 and 1 inch for each field coated with phosphor on the back of every other vertical line of the guard band 34.
350.35g of Sox phosphor stripe.

Index phosphor stripe 3 for each field above
50.35E emits light with different wavelengths when an electron beam collides with it. and the index fluorescent stripe stripe 35o.

35E is 2 of each color stripe strip 31, 32, and 33.
One line is provided for each line, and an intex signal indicating the scanning position of the two electron beams is given to each line of each field.

The index phosphor stripes 350, 35E are provided with a different number of marker portions 36 for each color in order to distinguish the color of each phosphor stripe 31, 32, 33. In this embodiment, the red phosphor stripe 31 is designated by the number of marker parts "0", the green phosphor stripe 32 is designated by one marker part 36, and the blue phosphor stripe 32 is designated by one marker part 36. The live 33 is designated by two marker sections 36 and 36.

The index phosphor stripe 3 is attached to the color fluoro tube 20 equipped with the screen 23 having the structure described above.
50.35B with each electron gun 21.22 f
two photodetectors 2 that detect light emitted by the electron beam from f as an index signal;
40.24g is provided, and the photodetectors 240, 24E
The index signal ID as shown in FIG. 2E obtained in
is supplied to the color switching pulse generator 11 and the control pulse forming circuit 12 via the index signal selection circuit 30.

Here, the red phosphor stripe 31 and the green phosphor stripe 32 on both sides of the INTEX phosphor stripe 35o for the odd field in FIG.

Old, below, second line l. 2. Third line l. 3
As, each line e. + , 102 , electron beam I from the above two electron guns 21.22 for lO3
＋.

■The first line lol that scans each heem position I-S, , S2 by 2 as shown in Figure 5A.
By scanning, an intex signal 11) which does not show the green phosphor stripe 32 and has one rising pulse given by the marker section 36 and two rising pulses is obtained, and furthermore, the third line 103 Then, 餘－〇－
An Intex signal LD with two rising pulses indicating the blue phosphor stripe 33 is obtained. Each rising pulse added to the above index signal D (is given at a predetermined timing by each marker section 36 provided on the index phosphor stripe 35o).

Therefore, in the color switching pulse generation circuit 11 to which the index signal is supplied, the first line white pulse LWP
The color of the color band light stripe being scanned by the electron heat 1 from the first electron gun 21 is determined by the number of rising pulses obtained by categorizing the Intex signal 11) at Also, the second line white pulse LWP2 l? 1, the color of the color band light stripe scanned by the electron beam 2 from the second electron gun 22 is determined based on the number of rising pulses obtained by categorizing the INTEX signal ID. And a switching pulse can be supplied to the second color switching circuits 4 and 5.

Furthermore, the color cathode ray tube 20 in this embodiment is as follows:
Based on the Intex signal ID, two e-bees 1. z
I3. The color ranking control of I2 is performed as follows.

First, this color cathode ray tube 20 deflects two electron beams from each of the electron guns 21, 22 in the vertical direction between the two electron guns 21, 22 and a main deflection yoke (not shown). Each beam spot Sl + S by the sub-vertical deflection yoke 25 and the two electron beams l, , 12
2. A converse sense sulcoverse sense yaw 26 is provided.

The two electron beams L and I2 from the two electron guns 21 and 22 are connected to each video output circuit 7 as described above.
, 9, a small constant level of brightness modulation is applied in advance by l QMf (high frequency carrier f of about z).Here, the modulation of each of the above-mentioned electronic beams I, , I2 is shown in the Hector diagram of Fig. 6. As shown in , based on 7. Kao.

・9o1□l 0)ii-7-e” b I r kami +
60 degrees, so that the second electron beam has a phase relationship of 160 degrees.

Each electron beam I, , I is subjected to the brightness modulation as described above.
The inch-nox word ■D given by the inch-nox phosphor stripe 35 scanned at 2 is determined by ± in the vector diagram of FIG.
A solid circle in the Y direction is given, and a round circle in the X direction is given by performing phase detection of the button.

Therefore, by applying vertical deflection in the vertical direction given by the magnitude relationship between the hector in the +Y direction and the vector in the -Y direction to each of the electron beams L and I2 by the sub-vertical deflection yoke 25, each of the electron beams is (1) and (2) eventually come to rest at a position where the vectors in the ±Y direction are balanced. That is, for example, as shown by the broken line in FIG. 7, the downwardly grazing valley beam spot Sl, 82 is caused by the vertical deflection, as shown by the solid line in FIG.
Landed on the stripe.

In addition, the X direction θ in the above figure 60)
Compact the size of the vector to a predetermined constant value.
When the sense yoke 26 is excited, each electron beam 11,1
2 beam spot S1. The interval of S2 can be converged to a constant value.

That is, when the index signal is smaller than a predetermined value, the vector in the X direction is increased to bring the beam spots S+ and Sz closer together as shown in FIG. 8A, and
In the opposite case, as shown in FIG. 8B, each beam spot S1. A predetermined convergence is performed with a distance of S2.

In this way, the vector in the ±Y direction and the vector in the
By performing two types of control for each field, color randomization is performed in odd fields as shown in FIG. 5A, and color randy ink is performed in even fields as shown in FIG. 5B. You can do the same thing.

That is, in FIG. 1, the sub vertical deflection yoke 25 and the convergence yoke 26 provided on the color cathode ray tube 20
The sub vertical deflection output circuit 50 and the comparator output circuit 60 that drive the auxiliary vertical deflection output circuit 50 and the comparator output circuit 60 are subjected to the following feedback control based on the index signal ID.

A photodetector 24o provided on the color cathode ray tube 20.

The index signal iD obtained at 24F is alternately selected for each field by the signal selection circuit 30 and passed through a bandpass filter 40 with a center frequency of /'o to the first to third multiplication circuits 41.42°. 43. A carrier wave with an advanced phase of +90° is supplied from the carrier wave oscillator 12 to the first multiplication circuit 4.1, and by multiplying this carrier wave by the index signal D, the vector shown in FIG. A multiplication output ID+y corresponding to the back 1 degree component in the +Y direction in the figure is obtained. Further, the second multiplication circuit 42 similarly outputs a multiplication output of the carrier wave with a delayed phase of 190° and the index signal ID, that is, an output I 1 corresponding to the vector component in the -Y direction described above.
)-Y is obtained. Furthermore, the third multiplication circuit 43 similarly obtains the multiplication output of the carrier wave of the reference phase C and the above-mentioned index signal, that is, the output 11) x corresponding to the vector component in the above-mentioned X direction.

The sub-vertical deflection output circuit 50 that drives the sub-vertical deflection yoke 25 provided on the J-Rawn tube 20 outputs each multiplication output ID+y, ID obtained from the first and second multiplier circuits 41 and 42. -y is the integrator circuit 4
4.45, and performs vertical deflection control of the two electron beams 11° I2 using the difference output between the multiplication outputs I D+y and I D−y as control variables. The convergence output circuit 60 that drives the convergence output circuit 26 includes an operational amplifier 61 to which the multiplication output IDx obtained by the third multiplication circuit 43 is supplied via the integration circuit 46, and each electron beam L
, I2 performs conover sense control between each heam spot 's+ and Sz using the difference output between the reference voltage VREF that defines a predetermined conver sense state between the beam spots 81 and 82 and the multiplication output as a control amount.
cormorant.

In the convergence output circuit 60, the multiplication output 11)x from the third multiplication circuit 43 is based on the index signal ID given by the index phosphor stripe 350.35E provided for each field, that is, Since the convergence state of each beam spot 81 and 82 indicated by the vector in the X direction in the vector diagram is compared with the predetermined convergence state given by the reference voltage VREF, each color band stripe 3
Taking the interval between 1°32.33 as 1 sector, each field is divided from +6 sectors to -l as shown in Figure 9.
Each beam spot sl within the tolerance range of the segment,
82 can be pulled into a predetermined compliance state. That is, each beam spot S1. If S2 is located with an interval even slightly smaller than the limit value of +6 sectors shown by the broken line in FIG. 9, the multiplication output I indicating the vector component in the X direction given by the index signal
Since the signal 1/bel of Dx, ie, the index amount, is lower than the reference voltage VREF, each beam spot S+.

Convergence control is performed to bring S2 closer to each other, and a predetermined convergence state can be achieved as shown by the solid line in FIG. Also, each beam spot s
+, S2 are too close to each other, the index amount is larger than the reference voltage Vnp:r, and each beam is Spot S+.

As the conover sense control is performed so as to release S2, it is possible to draw into a predetermined compulsence state as indicated by the solid line in FIG.

Here, in order to stably perform color landing control as described above, it is necessary to obtain the index signal ID without being affected by changes in the electron beam current IK, which increases or decreases depending on the image signals V, , V2. be. In this example,
A small carrier wave J'o of 10 MHz is superimposed on the video signal and subjected to brightness modulation, and this 10 MHz component is detected as the index signal ID. However, since cathode ray tubes generally have a γ characteristic, the γ characteristic is Due to this influence, the amplitude of the index signal Dout changes as shown in FIG. 1O. Therefore, in this embodiment, each of the video output circuits 7 and 9 is configured as shown in FIG. 11.

That is, in FIG. 11, the first signal adder 71 adds the line white pulse LWP1. from the control pulse forming circuit 12 to the video signal supplied via the blanking circuit.
Superimpose LWP2. The output of this first signal adder 71 is supplied to second and third signal adders 72,73. The second signal adder 72 superimposes the carrier wave f from the carrier wave oscillator 13 onto the video signals V+ and V2. This second
The output of the signal adder 72 is supplied from an inverse γ correction circuit 74 to the third signal adder 73 via a bandpass filter 75. As shown in FIG. 12, the inverse γ correction circuit 74 applies an inverse γ characteristic complementary to the γ characteristic of the cathode ray tube shown in FIG. 10 above to the video signal. The 10 MI-Iz carrier wave, that is, the index signal superimposed on the video signal subjected to the inverse γ correction in the inverse γ correction circuit 74 is detected with a constant amplitude by the light emitter 24 provided in the color cathode ray tube 20. Become so.

Additionally, in general, the scanning of electron beams in a cathode ray tube is accompanied by vertical deflection distortion, so in this embodiment, in order to properly land and ink each electron beam onto each line, the vertical deflection distortion is corrected as follows. Is going.

That is, in this embodiment, as shown in FIG.
1.82 is provided.

The sample and hold circuits 81 and 82 sample and hold the output voltages of the output circuits 50 and 60 necessary to draw the electron beam into each line, thereby obtaining beam position correction voltages.

The sample and hold operation of each of the sample and hold circuits 81 and 82 is performed in accordance with the sup link pulse SP shown in FIG.
(This is done every time.Then, the beam position correction voltage E obtained in the sample hold circuit 81 and 82 mentioned above is
,! ,. At the start point of horizontal scanning of the next line, each output circuit is activated via each switch circuit 83, 84 operated by a beam position correction pulse IPC as shown in FIG. 2G formed by the control pulse forming circuit 12. 50.Superimposed on the output from 60.

That is, as shown in FIG. 13, a beam position correction voltage E△0 corresponding to the amount of deviation of the beam position due to vertical deflection distortion is obtained during beam scanning before line ①, and the beam position correction voltage E△0 is used to By sequentially correcting the beam position of the lines, each line can be properly landinked. Here, the beam spot 1'Sn indicated by a broken line in FIG. 13 indicates the initial position of the beam that has caused an error due to vertical deflection distortion, and the beam spot Sn indicated by a solid line is indicated by the beam position correction voltage "An". -1 shows the initial position of the beam corrected.

In the embodiment with the above-described configuration, two electron beams are accurately directed to the color-banded phosphor stripes of each field based on the index signal ID given by the index phosphor stripes provided for each field. By performing color landing and interlaced scanning, line-sequential color images can be reproduced by simultaneous two-color emission. Moreover, since it reproduces a line-sequential color image by scanning two electron beams and simultaneously emitting two colors, it is different from the Intex-type color cathode ray tube, which reproduces a dot-sequential color image by scanning a single electron beam. In comparison, the brightness can be increased approximately four times. That is, in a color cathode ray tube that reproduces color images dot-sequentially, as shown by the solid line in FIG. When reproducing a line-sequential color image as in this embodiment, the first
As shown by the broken line in FIG. 5, the drain current flows continuously. The area ratio of each of the above 1-life current waveforms is approximately 6, and since the number of horizontal scanning lines per single color in this embodiment is 2-1, the color frame shown in FIG. Because the tube has a ridge, it becomes 6 × + "4, or 4 times as bright.

In addition, in the case of ■beam point sequential method, it is necessary to perform color switching operation at a color switching frequency of about 30MHz;
When the 2-bit line sequential method is adopted as in this embodiment, 1.
Since the color switching frequency is 5.75 KHz, not only unnecessary radiation interference is reduced, but also power consumption can be reduced.

Furthermore, when a line-sequential color image is reproduced by controlling each electron beam as in the above-described embodiment, the index phosphor line 35 applied continuously on a horizontal line can be
It is possible to obtain an index signal with a good /N ratio, and since the beam spot S enters the index phosphor line 35 when the image is black as shown in FIG. The black level is lowered and a high conotrast is obtained. In FIG. 15, the beam spot S for a bright image is shown by a broken line, and the beam spot S for a dark image is shown by a solid line.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a color television receiver according to the present invention. FIG. 2 is an evening chart 1 for explaining the operation of the above embodiment. 3 and 4 are drawings schematically showing the structure of the screen of the color fluoro tube used in this example. FIG. 3 is a plan view of the main part of the screen, and FIG. It is a U-II' sectional view. 5A and 5B are plan views of main parts of the screen IJ for explaining the scanning state of the electron beam in the above embodiment, FIG. 5A shows an odd field, and FIG. 5B
indicates an even field. 6 to 9 are drawings for explaining the operation of color land ink control in this embodiment, and FIG.
A vector diagram of the index signal obtained by scanning the book with the electron beam. Figure 7 is a plan view of the main part of the screen showing the operation of the sub-vertical deflection yoke. Figures 8A and 8B are the operations of convergence-3. Indicates, l, 9 IJ-7
FIG. 9 is a plan view of the main part of the screen showing the range in which each beam spot is pulled in by the convergence yoke. FIG. 1O is a characteristic diagram showing the γ characteristics of a cathode ray tube. FIG. 11 is a block diagram showing a specific example of the configuration of each video output circuit in the above embodiment. FIG. 12 is a characteristic diagram showing the characteristics of the inverse γ correction circuit provided in the video output circuit. FIG. 13 is a plan view of a main part showing each example of scanning of a screen by an electron beam in the above embodiment. FIG. 14 is an explanatory diagram for explaining the brightness of an image when a color image is reproduced one beam at a time. FIG. 15 is a plan view of the main part of the screen for explaining the image contrast in this embodiment. 1.2.3... Signal input terminal, 4, 5... Color switching circuit, 7, 9... Video output port, path, 11... Color switching pulse generator, 12... Control pulse Formation circuit, 13...
-Carrier wave oscillator, 20...color cathode ray tube, 21.
22...electron gun, 23...screen, 24o
, 24g, -1 photodetector, 25... Sub-vertical deflection yoke, 26... Convergence yoke, 30... Index signal switching circuit, 31, 32, 3.3... Color belt stripe, 34... Buhud Basid, 35o
, 35B...index phosphor stripe,
36... Marker section, 41°42.43... Multiplication circuit, 50... Sub-vertical deflection output circuit, 60... Convergence output circuit, I,, I2... Electron beam, S+,
Sz, 8...beam spot. Patent Applicant Sony Corporation Agent Patent Attorney Kodo Koike 1) Sakae Mura - Figure 5A Figure 5B Figure 10 Figure 11 Figure 12

Claims (1)

[Claims] In this method, index lines for odd-numbered fields and index lines for even-numbered fields that are continuous along the horizontal scanning direction are arranged alternately in the vertical scanning direction, and light of different colors is applied along both sides of each index line. A screen with arrayed body lines is scanned with two electron beams, and based on the index signal obtained from the index line, the two electron beams are applied to each color band light body on both sides of the index line for each field. A color television receiver characterized in that a color image is reproduced line-sequentially by two-color circumferential emission by landing on a line and switching colors for each index line.