JPS6110836A - Flat type color cathode-ray tube and its driving method - Google Patents

Abstract

PURPOSE:To secure a fine beam spot in a horizontal direction as well as to make a landing position in the horizontal direction of a beam incident to a phosphor screen adjustable, by setting up a horizontal landing position adjusting electrode and a main horizontal deflecting electrode either. CONSTITUTION:A fine horizontal deflection is added to each electron beam run past through open holes of electrodes 43-46 of G1-G4 and simultaneously an electrode (FH)47 performing horizontal focusing of these beams and a main deflecting electrode (DH)48 deflecting these beams in the horizontal direction both are set up there. Doing like this, a fine beam spot is secured in the horizontal direction, while landing position adjustment in the horizontal direction of these beams being incident onto a phosphor screen 51 is easily performable.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flat color cathode ray tube used in a terminal display of a color tenvision receiver 9, an autopsy machine, and a method for driving the same.

Conventional Structure and Problems There is a prior art planar cathode ray tube created by the present applicant with a structure shown in FIG. In reality, each electrode is housed in a vacuum envelope (glass container), but
In the figure, the vacuum envelope is omitted to make the internal electrodes clear. In addition, in order to clarify the horizontal and vertical directions of the screen on which all images, characters, etc. are displayed, the horizontal direction (H) and vertical direction (V) are shown on the face plate.

A plurality of vertically long linear cathodes 10 each having an oxide cathode formed on the surface of an uncut tungsten wire are independently arranged at equal intervals in the horizontal direction. The number of linear cathodes 1o and the spacing between them are design matters. For example, if the display screen size is 10 inches, the horizontal spacing between the 20 linear cathodes 1o is approximately 1 mm, and the 20 linear cathodes are arranged vertically. It is arranged with a length of about 160 mm in the direction. On the opposite side of the face plate portion 9 across the linear cathode 10, there are arranged adjacent to the linear cathode 10 on the insulating support 11 at equal pitches in the vertical direction, and electrically divided and elongated in the horizontal direction. Vertical scanning electrodes 12 are arranged. These vertical scanning electrodes 12
For example, if two normal television images are to be displayed, they are formed as independent electrodes in the vertical direction equivalent to the number of horizontal scanning lines (approximately 480 in the NTSC system). Next, between the linear cathode 1o and the face plate 9, a planar first grid electrode 13 is formed in which openings are formed in the portions corresponding to the linear cups and electrodes 10 in order from the linear cathode 10 side. are arranged, and then second grid electrodes 14 for beam modulation, which are electrically isolated from each other and have an electron beam passage hole, are arranged corresponding to the individual linear cathodes 10;
A third grid electrode 15 having a similar shape to the grid electrode 13 is arranged. Next, a horizontal deflection electrode 16 is arranged to apply a horizontal deflection to the electron beam passing through the aperture provided in each electrode. A light emitting layer 17 consisting of a phosphor and a metal back electrode is arranged on the inner surface of the face plate 9. One layer of phosphor is sufficient for black and white image display, but for color display, horizontal VCIlli
ii) Formed as red (R), green (G), and blue (B) stripes or dots.

Next, FIG. 2 shows the operation of the flat plate cathode ray tube.

This will be explained using FIG. FIG. 2 shows a horizontal cross-sectional structure of the flat cathode ray tube shown in FIG.

The electrons generated by heating the linear cathode 10 apply a voltage to the vertical scanning electrode 12 that is almost the same potential as the linear cathode 10, and a voltage that is higher than the potential of the linear cathode 10 to the first grid electrode 13. By applying a voltage, it advances toward the opening of the first grid electrode 13. In FIG. 2, the electron beam trajectory is indicated by 18. The 71L beam passed through the aperture of the first grid electrode 13 by 11.
It is modulated by the second grid electrode 14. In the case of color image display, R-G, , B-si R→G-→B→
The electron beam that passes through the point 11 (which is modulated by the wide-mouthed image 1.1 and the second grid electrode 14) is transmitted by the third grid electrode 15 onto the phosphor light-emitting layer 17. The beam is focused into a small beam spot.

Next, a sawtooth wave or step-like horizontal deflection voltage is applied through the water deflector 16 and the wiring 16, and the 'fin TI'-beam 18 is applied with a predetermined width in the horizontal direction. It is deflected and stimulates the light emitting layer 17 on the face plate 9 to obtain a -C light emission image. To display a color image,
As described above, when each electron beam horizontally scans the light emitting layer 17, a modulation signal of a color corresponding to the color band member on which the electron beam is incident is applied to the second grid electrode 14.

Next, vertical scanning will be explained using FIG. 3.

Close to the back of the linear cathode 1o, there is a vertical line that is long in the horizontal direction and divided vertically into the number of horizontal scanning lines necessary to form an effective screen, for example, about 480 lines in the case of the NTSC system. Scanning electrodes 12 are arranged, and a vertical scanning signal is applied to each of these electrodes. As described above, by fully controlling the voltage of the vertical scanning electrode 12 so that the potential of the space surrounding the linear cathode 10 is more positive or negative than the potential of the linear force sheet 1o,
Generation of electrons from the linear cathode 1o is controlled. At this time, if the distance between the linear cathode 1o and the vertical scanning electrode 12 is small, the control voltage may be small. For example, if the distance is set to about 0.3 mm, the generation of electrons can be controlled with a voltage of about cs Vpp. I can do it. In the case of a television image using an interlaced method, the vertical scanning electrode 12 is
From A, the beam is generated (hereinafter ON) signal for only one horizontal scanning period (hereinafter referred to as 1H), from 12CVC, the beam is ON only for the next 1H, and then sequentially for every other vertical scanning electrode only for 1H. A signal is applied to turn on the beam,
When 12X at the bottom of the screen is completed, vertical scanning of the first field is completed.

In the next second field, a signal is applied from 12B that turns on the beam only for 1H, and finally 12Y-
By scanning at 4, one frame of vertical scanning is completed 1'.

In a flat cathode ray tube that forms a full color screen through vertical scanning, beam modulation, and horizontal constant H as described above, the beams from multiple vertically long cathodes arranged at equal intervals in the horizontal direction are , when the horizontal deflection voltage is O, the horizontal positional relationship of the light incident on the phosphor surface must also be at equal intervals. If this relationship breaks down, each beam will be incident on a different color band light body, resulting in a color image with a different hue for each block. In a cathode ray tube, when attempting to correct f'L, this is done using the horizontal deflection electrode, but since a high voltage with the same potential as the fluorescent surface is applied to the horizontal deflection electrode, it is not necessary to apply it to the plate electrodes on both sides. Even if you want to adjust the voltage that is present, a high correction voltage is required.

Furthermore, it is necessary to switch the color signal applied to the second grid electrode in accordance with the R, G, and B color bands that each beam is incident on, but since the cathode ray tube does not have this function, the amplitude of the horizontal deflection is If the color changes, the hue will be distorted and faithful color image display will no longer be possible.

Purpose of the Invention The present invention has an electrode structure that allows a horizontally narrow beam spot to be obtained, the horizontal landing position of the beam incident on the phosphor surface to be easily adjusted, and the beam position to be detected outside the effective screen display area. By doing this, it is possible to establish a correspondence between the color signal for beam modulation and the color band light body on which the beam is incident, and to solve the above-mentioned problems.

Structure of the Invention The present invention &j: :il'i- An effective display screen is a fluorescent surface in which vertically long three primary color emitting phosphors of R, G, and B are sequentially and repeatedly provided in the horizontal direction via a black stripe. year,
a phosphor surface provided with an index phosphor stripe for beam position detection on the horizontal outside of the effective display screen; a plurality of electron beam generation sources arranged horizontally on the phosphor surface;
A flat color cathode ray tube comprising a horizontal deflection electrode disposed between the fluorescent surface and the electron beam generation source, and an electrode for horizontal focusing and beam horizontal land ink position adjustment on the /7 node side of the horizontal deflection electrode. be.

In such a flat color cathode ray tube, the horizontal landing position of each beam is adjusted by adjusting the voltage of the horizontal landing position adjustment electrode, and the light is received by the photoacoustic photoelectric conversion element from the index phosphor. This is a driving method that performs color double-image display by switching the timing of the color signal applied to the 01 electrode based on this signal.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 4 is a perspective view of one embodiment of the present invention, and FIG. 5 is a horizontal sectional view thereof. In each figure, as in FIG. 1, a plurality of vertically long linear cathodes 40 are arranged at equal intervals in the horizontal direction, and one cathode is arranged outside both sides of the effective display, and the cathodes 40 are placed on the opposite side of the face plate 52. , at equal pitches in the vertical direction on the insulating support 41 in close proximity to the cathode 4o,
Further, horizontally elongated vertical scanning electrodes 42 are arranged which are electrically isolated from each other. If this vertical scanning electrode 42 is to display a single screen image on a normal television, all the electrodes are formed in the vertical direction in the number of horizontal scanning lines (approximately 480 in the NTSC system). Next, the linear cathode 40 and the face plate 52
During the VC, sequentially from the linear cathode 4Q side, planar electrodes having openings in the portions corresponding to the linear cathodes 40 are divided between adjacent electrodes, and a video signal is applied to each electrode. A first grid (G1) electrode 43 for beam modulation is arranged, and a second grid (G2) electrode 43, which has the same aperture as the G1 electrode 43 and is not electrically divided in the horizontal direction, is arranged.
) electrode 44 and third grid (G3) electrode 45 are arranged. Next, the fourth grid (G4) electrode 46 has an opening wider in the horizontal direction than the opening of the G2 electrode 44° and the opening of the G3 electrode 45.
Further, an electrode (FH) 47 is placed to apply a slight horizontal deflection to the electron beam passing through the apertures of the Cr1 to G4 electrodes, and at the same time horizontally focus the beam. Main deflection electrode (DH) 4 that deflects to
Place 8. A light emitting layer consisting of a phosphor 61 and a metal back electrode 60 is arranged on the inner surface of the face plate 62. As shown in FIG. 6, the fluorescent surface 51 has an effective display screen area (area A) in which R2G and B color band phosphors 6o are arranged repeatedly through a plaque stripe 61, and each block is arranged in the same way. is formed. - Outside the area of the effective display screen in the horizontal direction (area B), a block having the same electrode configuration dimensions as one horizontal block of the effective display screen is provided, and instead of the R, 'G, and B color bands 60, An indexing phosphor 62 is formed on the periphery.

This index phosphor 62 includes a near-ultraviolet phosphor,
Alternatively, one of R, G, and B phosphors may be used.A filter 63 is provided on the outside of the face plate 62 corresponding to the index phosphor 62 to allow light from the index phosphor 62 to pass through. A photoelectric conversion element 64 is further provided to receive the light that has passed through the filter 63.

Next, the operation of the color cathode ray tube will be explained. heating the linear cathode 40 by passing an electric current through it;
G1 electrode 43. A voltage equivalent to the potential of the cathode 40 is applied to the vertical scanning electrode 42 . At this time, G1. The beam advances from the cathode 4o toward the G2 electrode 43, 44, and a voltage (100 to 300 V) higher than the potential of the cathode 40 is applied to the G2 electrode 4 so that the beam passes through each electrode aperture.
4. Here the beam is G1. G2 electrode 43.4
To control the amount passing through each aperture of G1 electrode 43
This is done by changing the voltage.

The beam passing through the aperture of the G2 electrode 44, the G3 electrode 45-
Proceed to G4 electrode 46-4F and electrode 47. By applying a predetermined voltage to these electrodes, a focusing action is performed so that the beam spot on the fluorescent surface 61 becomes small. F)
! The electron beam that has passed through the electrode 47 scans the fluorescence enhancement 61 by applying a sawtooth wave or staircase wave deflection voltage with a horizontal scanning period to the electrode 48 . At this time G1
The timing control of the color signal applied to the electrode 43 will be described later, but the vertical scanning is the same as the conventional example, so the explanation will be omitted.

A generally well-known method for a signal processing system for driving a cathode ray tube having a large number of horizontal beam sources as in the present invention will be explained with reference to FIG.

Timing pulse generator 7 by TV synchronization signal 72
4, a timing pulse is generated to drive a circuit block to be described later. First, one of the timing pulses is used to demodulate the three primary color signals of R, G, and B (ER'+
EGp EB ) 71 is converted into a digital signal by an A/D converter J-73, and the signal for one horizontal scanning period (hereinafter referred to as 1H) is input to the first line memory circuit 76. When all 1H signals are input, the signals are simultaneously transferred to the second line memory circuit 76, and the next 1H signal is also input to the first line memory circuit 76. The signal transferred to the second line memory circuit 76 is 1
During the H period, the memory is retained and the D/A converter (
Alternatively, the signal is sent to the modulation electrode (G1) 43 of the cathode ray tube, where it is converted to the original analog signal (or pulse width modulation signal) and amplified.
to be applied. The line memory circuits 75 and 76 are used for time axis conversion, and will be specifically explained using FIG. 8.

The number of beams used to scan the effective screen area (
In other words, if the area horizontally scanned by each beam is 2 triplets (one triplet is one set of R, G, and B phosphor stripes), then the R
, G, B each primary color signal 81 video signal insertion time T is T/n
The time axis of the video signal of each period is multiplied by 1 and T
The arrangement of phosphor stripes on the phosphor surface is R-7G-
B, each primary color signal whose time has been extended by a factor of T is gated with a gate pulse having a time width of T/e, ]i: R
The signal is converted into a time series signal 82 of -+'ff, , -EB, and is input to a predetermined modulation electrode ulr1) 43. In this way, a 1H image is formed, which is combined with vertical scanning to form the entire image.

Here, it is necessary to set the timing between the time-series color signal applied to the modulation electrode (Cr1) 43 and the fluorescent surface scanning position of the electron beam. That is, the electron beam modulated by the H signal must enter onto the R phosphor stripes U and I. Therefore, in FIG. 6, the beam arrival position signal, that is, the index signal is detected by receiving the light emitted from the index phosphor 62 by the photoelectric conversion element 64 by the electron beam of the electrode block provided outside the EJ-effect surface. ,
This signal ensures accurate timing between the electron beam position on the fluorescent surface and the color signal applied to the modulation electrode (G1) 43. This will be explained in detail using FIGS. 9a and 9b.

The beam that scans the index phosphor is always ON except during predetermined horizontal and vertical blanking periods.

The index signal 91 from the photoelectric conversion element is waveform-shaped by a band amplifier and limiter 93 to obtain a signal as shown in FIG. The frequency of signal 97 is determined by the horizontal scanning speed of the electron beam and the pitch of the index phosphors. On the other hand, TV synchronization signal 9
2, the timing pulse generator 94 uses 1/3
A reset pulse 98 for the frequency divider 95 is generated, and after this pulse is turned ON, IA frequency division of the incoming signal 97 is started to obtain a three-phase pulse signal 99. Furthermore, the index signal 97 and the reset signal 9B are sent to a pulse counter circuit 100, and in FIG. Clear.

D/
Each primary color signal output from the A converter is gated by a gate circuit 96 to obtain time-series signals of ER-E and -EB. Alternatively, the above time-series signal can be obtained by using the three-phase pulse 99 as a timing pulse for reading from the second line memory 76 in FIG. By amplifying this signal with an amplifier 90 and applying it to each modulating electrode, a faithful color image can be displayed.

Note that there is a time delay between detecting the index signal, processing the video signal based on the index signal, and applying the signal to the modulation electrode. If this delay time is very small, the embodiments shown in FIGS. 6 and 9 may be used, but this delay time may become a problem depending on the circuit film. In this case, as in the second embodiment shown in FIG. 10, the index phosphor 62 and black stripe 61 of the first embodiment (FIG. 6) may be replaced. It should be noted that the same parts in FIG. 10 as in FIG. 6 are designated by the same reference numerals and their explanations will be omitted. The index signal processing at this time may be the same as that shown in FIG. 9, as shown in FIG. This is accomplished by providing a delay circuit in the amplifier/limiter circuit 93. Further, the pulse counter 100 is configured to count seven pulses at the leading edge of the index signal, and the pseudo branch unit is cleared with this count output. Note that the gate pulse 119 at this time can also have a pulse width from the leading edge (rising edge) of the index signal 117 to the next leading edge, as shown in FIG.

If you do the above, index signal processing [! Even if a time delay occurs in the circuit, it can be compensated for.

Figures 12 and 13 show the third embodiment, and the index phosphor 62 in the second embodiment shown in Figure 10.
, with every other one removed. In this way, the frequency of the index signal becomes a bar and becomes 3/2 of the fundamental frequency of the primary color signal applied to each modulation electrode, so even if the signal from the effective screen area mixes into the photoelectric conversion element, the bandpass filter can prevent it. can be separated. The index signal processing system at this time will be explained with reference to FIGS. 13a and 13b.

The index signal 130 from the photoelectric conversion element is passed through a bandpass filter and limiter 131 to extract a desired signal component and shape the waveform thereof. This output 131' is doubled by the frequency doubling circuit 132, triplex,
- Obtain a signal 132' with three times the frequency. On the other hand, based on the TV synchronization signal 133, the timing pulse generator 134 generates a reset pulse for the false divider 136 and pulse counter 135, and after this pulse is turned ON, the index signal 132' is frequency-divided. A three-phase pulse 136' is obtained. On the other hand, the index signal 132'
i, l: are also input to the pulse counter 135, and generate a clear pulse for the A frequency divider 136 by the same operation as in the second embodiment. Pulse 13 from 14 divider 136
6' is the gate circuit 13 as in the first and second embodiments.
7 or the readout circuit of the second line memory circuit 76. In order to establish a correspondence between the deflected modulation signal and the beam position on the phosphor surface, a delay circuit (not shown) is inserted into the doubler circuit 132 or its output side, if necessary.

Like buried soil, each primary color signal applied to the modulating electrode (rl) 4s can correspond to the beam position on the fluorescent surface. It also happens that the difference is different.For this reason,
F□ electrodes 47 formed separately on both sides of the insulating plate 49
When a large number of blocks are arranged in parallel as shown in FIG. 14, the FH electrode 47a on one side of each block is commonly connected to the focus power source 141. FH electrode 4 on other side
A and b are each independently connected to a variable resistor 144. This variable resistor 144 is connected to a power supply 142 which is added to the focus power supply 141. It is connected to the θ power supply 143. By doing this, the horizontal focus of the beam is achieved by varying the voltage of the power supply 141, and the horizontal position of the beam incident on each horizontal deflection area is individually adjusted by the variable resistor 144, and the phosphor is positioned at a predetermined position. The beam can be accurately incident on the Since the voltage supplied to the FH electrode can be designed to be approximately lower than the phosphor surface potential, if the horizontal landing position of the beam is adjusted using this 2M electrode 47,
This adjustment voltage may also be low, and there is little danger in handling.

The DH electrodes 48 are also formed by metal vaporization or plating on both sides of the same insulating plate 49, and are connected to common one-way wires 48-a, 48-, and b, respectively. As described above, a sawtooth wave or staircase wave signal for horizontally deflecting the beam is applied to this common bus line. In order to reduce the capacitance between the horizontal deflection electrode plates, the D□ upper electrodes formed on both sides of each insulating plate 49 are electrically connected, and every other electrode is connected to the common bus bar, or only the DH electrodes are connected. It can also be easily thought of as a metal block. At this time, one of the horizontal scanning directions of the adjacent beams is R-(.

-B, the other becomes B-bG-R, so it goes without saying that the order of the primary color signals input to the modulation electrodes is changed accordingly.

Effects of the Invention As described above, according to the present invention, a horizontal landing position adjustment electrode for the beam on the fluorescent surface is provided separately from the main horizontal deflection electrode, and the horizontal landing position of each beam can be adjusted using a low voltage. This makes it possible to reduce power consumption compared to conventional methods.

In addition, one block having the same electrode configuration as the plurality of beam generating blocks in the effective screen area is provided outside the effective screen area in the horizontal direction, and the fluorescent surface is used as an index phosphor instead of RlG and B. By always obtaining the index signal, a faithful color image can be displayed without degrading the quality of the image within the effective screen.

A perspective view, a horizontal cross-sectional view, and an explanatory diagram of vertical scanning operation of a plate-type cathode ray tube, FIG. 6 is a horizontal sectional view showing the relationship between the electrodes and the fluorescent surface structure of the flat color cathode ray tube according to the present invention, and FIG. 7 is a video signal processing diagram of the flat color cathode ray tube according to the present invention. System diagram, Figure 8 is a waveform diagram explaining its operation, Figure 9a
.

b is a waveform diagram and a block diagram showing the index signal processing system of the flat color cathode ray tube of the present invention, FIG. 10 is a horizontal sectional view of another embodiment of the flat color cathode ray tube of the present invention, and FIG. FIG. 12 is a waveform diagram illustrating index signal processing in the embodiment of FIG. FIG. 12 is a waveform diagram and block diagram showing the index signal processing system in the embodiment, and FIG. 14 is a wiring diagram of the horizontal focus and horizontal deflection electrodes of the flat color cathode ray tube according to the present invention.

10, 40... Linear cathode, 12.42...
...Vertical scanning electrode, 13, 43...First grid electrode, 14.4.4...Second grid electrode, 16.
46...Third crit electrode, 46...Fourth grid electrode, 47...Water size-focus electrode, 16.
48...Horizontal deflection electrode, 17, 51...
- Fluorescent surface, 90...R9G, Bql, body stripe, 61...Black stripe, 62...
-... Index fluorescent stripe, 63... Color filter, 64... Photoelectric conversion element, 71...
...3 primary color signals, 72...TV synchronization signal, 7
3...A/D converter, 74...Timing pulse generator, 75.76...Line memory, 77...D/A converter, 91,130
Index signal input, 92.133...TV synchronization signal, 93.132...Limiter -194°134...Timing pulse generator, 95,1
36... 1/3 frequency divider, 137... Gate circuit, 100.

135... Hepulse counter, 141...
...Focus power supply, 142, 143...DC power supply, 144...Variable resistor.

Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure f2s-JL
--B2f) -----wL-m- f2× f2y
:4-~ Taste Fig. 5 Fig. 11 rTrTTIr Measure GERQB Fig. 13 Fig. 14

Claims (5)

[Claims] (1) The three primary color phosphors of red, green, and blue are formed repeatedly and sequentially in the horizontal direction through the black area, and furthermore, outside the effective image display area in the horizontal direction, the three primary color phosphors are formed in a predetermined manner with respect to the arrangement of the three primary color phosphors. a fluorescent surface on which a group of index phosphors are formed, occupying a relative position of , and emit an index signal when excited by electron beam scanning, and a plurality of electron beam generating sources are arranged in the horizontal direction of the fluorescent surface. In addition, a flat plate structure is provided with an independent horizontal landing position adjustment electrode that slightly deflects each electron beam in the horizontal direction along the beam traveling direction, and a main horizontal deflection electrode that horizontally deflects each electron beam. Color cathode ray tube. (2) The number of the three primary color phosphors in the predetermined horizontal deflection area scanned by the electron beam from the electron beam source, and the same pitch as the adjacent pitch of the three primary color phosphors, and 2. A flat color cathode ray tube according to claim 1, which has index phosphors provided identically to the central axis. (3) one more than the number of three primary color phosphors within a predetermined horizontal deflection area scanned by the electron beam from the electron beam source;
and index phosphors provided at the same pitch as the adjacent pitches of the three primary color phosphors and shifted by 1/2 pitch in the horizontal direction with respect to the central axis of the electron source. Flat color cathode ray tube. (4) Claim 1 having index phosphors provided at a pitch twice the adjacent pitch of the three primary color phosphors within a predetermined horizontal deflection area scanned by the electron beam from the electron beam generation source. The flat color cathode ray tube described in . (5) The three primary color phosphors of red, green, and blue are repeatedly and sequentially formed in the horizontal direction through the plaque area, and furthermore, a predetermined area is formed outside the effective image display area in the horizontal direction for the arrangement of the three primary color phosphors. It has a fluorescent surface in which a group of index phosphors occupying relative positions and are excited by electron beam scanning to emit an index signal is formed, and a plurality of electron beam generation sources arranged in the horizontal direction of the fluorescent surface. A beam is passed through a flat color cathode ray tube at all times except for the horizontal and vertical retrace periods to obtain an index signal of three times the triplet frequency, which is then converted into a 1/3 minute index signal by a reset pulse generated based on the TV synchronization signal. In addition to creating a three-phase pulse train signal with a frequency generator,
A method for driving a flat color cathode ray tube that counts the necessary number of pulses and clears the 1/3 frequency divider.