JPH0145939B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a flat cathode ray tube used in color image display devices such as color television receivers and computer terminal displays.

Structures of conventional examples and their problems Many types of flat cathode ray tubes for television reception have been announced in the past, examples of which are those announced by Zenith Corporation and Arizona State University are shown in Figures 1 and 2, respectively. Shown below. The cathode shown in FIG.
The electron beam emitted from the electron beam 1 is made incident on an electron multiplier 12 in order to be multiplied. This electron multiplier 12
The emitted electron beam is in the form of a long strip in the horizontal direction, which is modulated by a video signal at the modulation electrode 14, and the amount of the electron beam passing through the modulation electrode 14 is controlled to create a controlled electron beam. is accelerated by a high anode voltage applied to the screen 16 on which a fluorescent surface is formed, causing the fluorescent material to emit light. Electrode 1
3 and 15 are inserted to focus the electron beam. Further, the modulation electrode 14 is horizontally divided into the same number of picture elements, and a different video signal is applied to each modulation electrode 14, so that a horizontal video is displayed on the screen 16. On the other hand, the vertical direction is scanned by controlling the cathode potential or the potential of the electron multiplier 12, and a television image is displayed on the screen 16.

In the conventional example shown in FIG. 2, the cathode 1 shown in FIG.
1. The electron multiplier 12 is modified, and a large number of linear cathodes 22 are vertically arranged between the back electrode 21 and the mesh electrodes 23 and 24, so that the incident angle of the electron beam entering the electrode 25 is vertical. is configured to be. Since the other electrode configurations are the same as those in FIG. 1, the same reference numerals are given and explanations are omitted.

The major problem with the above configuration is the modulation electrode.
To display a color image, red (R) 31R, green (G) 31G, and blue (B) 31B are formed on the inner surface of the transparent glass face plate 35 as shown in FIG.
A divided modulation electrode 32 must be used corresponding to each phosphor stripe.

In addition, in FIG. 3, the fluorescent surface screen is connected to R,
G and B color phosphor stripes 31 are sequentially formed, and a metal back electrode 34 made of a vapor-deposited film of Al or the like is formed thereon.

However, since one pixel is formed by one set of R, G, and B, the width of the phosphor stripe must be made very narrow in order to obtain a high-resolution image. For example, if you try to display an image with 340 horizontal pixels on a 10-inch screen, the horizontal width of one pixel will be approximately 600 μm. This is R, G, B3
When trying to display primary colors, the width of each phosphor is
It becomes 200μm. Therefore, the modulation electrodes must be individually divided at a pitch of 200 μm, which is very difficult to manufacture, and the number of individually divided modulation electrodes is about 1000, which requires a circuit to drive each modulation electrode. The same number of electrodes are also required, making it extremely difficult to connect the modulation electrodes to the circuit.

OBJECTS OF THE INVENTION The present invention aims to solve the above-mentioned problems by reducing the number of divisions of modulation electrodes without impairing resolution.

Structure of the invention The present invention has 3n pieces in the horizontal direction (an integer where n≧2).
a first electrode group in which a plurality of vertically elongated electrodes each having n holes in the horizontal direction are separated from each other and arranged side by side in the horizontal direction; A plurality of n groups of second to (n+1) electrodes connected by a common bus bar and arranged side by side in the horizontal direction are installed at predetermined intervals in the electrode plate thickness direction with the pitches shifted by 1/n from each other. This is a flat cathode ray tube having a modulation electrode configured as shown in FIG.

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 the modulation electrode section in the first embodiment of the flat cathode ray tube according to the present invention, and FIG. 5 is a horizontal sectional view thereof. Other parts are first
Since it is the same as FIG. 2 and FIG. 2, illustration is omitted.

A first electrode group 41 in which vertically long striped electrodes each having six round, rectangular, or slit-shaped openings are separated and arranged horizontally is used as a modulation electrode. Next, the striped electrodes having the same structure as the striped electrodes constituting the first electrode group are horizontally divided into three, and vertically long striped electrodes each having two horizontal holes are separated. Common bus bars 42a, 42b, 42c, 43a, 43 are arranged horizontally and every two
Second and third electrode groups 42 and 43 connected to electrodes b and 43c are installed at a certain interval in the beam straight direction. Note that the second and third electrode groups are shifted in position by 1/2 pitch in the horizontal direction.

A fluorescent surface 45 consisting of R, G, and B color phosphor stripes is connected to a transparent surface via black stripes corresponding to the openings of the first, second, and third electrode groups configured as described above. It is formed on the inner surface of glass 48, and metal back electrode 47 is formed thereon.
At this time, the third electrode group 43 and the metal back electrode 47
As in the conventional example, a mesh-like electrode or an electrode 44 which has the same opening as each electrode group and is not divided in the horizontal direction is installed between the two electrodes.

Next, the operation will be explained. First, before explaining the operation of the embodiment, a general operation of a television display device using a flat cathode ray tube according to the present invention will be explained with reference to FIG.

In response to the television synchronization signal 52, a timing pulse generator 54 generates timing pulses for driving circuit blocks to be described later. First, the signal demodulated into R, G, B3 primary color signals 51 by one of the timing pulses is sent to the A/D converter 53.
The R, G, and B signals of one horizontal scanning period are input into the first line memory circuit 55. 1 horizontal scanning period (hereinafter
When all the signals (abbreviated as 1H) are input, they are transferred to the second line memory circuit 56, and the next 1H signal is input to the first line memory circuit 55. The signal transferred to the second line memory circuit 56 is stored and held for 1H, and is also sent to the D/A converter 57, where it is converted into the original analog signal. The signals converted to analog signals are guided to each modulation electrode of the flat cathode ray tube.
Control the beam amount. Here, there are the same number of D/A converter outputs as the modulation electrodes of the flat cathode ray tube, and a signal is continuously applied to each modulation electrode for 1H.

However, in a modulation electrode configuration in which several apertures are grouped together as in the embodiment of the present invention, a certain one
When looking at two electrodes, it is not possible to display a color image if the same signal is applied continuously for 1 hour. Therefore, first, Example 1 shown in FIGS. 4 and 5
The driving method for this will be explained.

FIG. 7 shows the driving method. Consider one of the modulation electrodes 41 in FIG.

Now, the R1 signal (Fig. 7 61-) is applied to the modulation electrode 41.
When R1sig) is applied, the beam modulated by the R1 signal passes through the apertures of the second and third electrode groups 42 and 43 and enters the R1 phosphor stripe on the phosphor surface 45. In order to
It is sufficient to apply the beam-on voltage 63c to 3c as well. However, at this time, it is necessary to prevent the beam from entering the phosphor stripes G1, B1, R2, G2, B2 other than the phosphor stripe position of R1, and for this reason, the other busbars 42b, 42c of the second electrode group And the voltages 62b, 62c, 63a, 63 for blocking the beam are applied to the other busbars 43a, 43b of the third electrode group.
b (hereinafter referred to as beam cutoff voltage) is applied.

Under the above operating conditions, the modulation electrode 41
When the signal 61-R1sig of R1 is applied, the beam modulated by this signal is incident only on the phosphor of R1.

Next, when the G1 signal 61-G1sig is applied to the modulation electrode 41, and the beam is to be incident only on the G1 phosphor, each bus bar of the second electrode group 42 operates in the same manner as in the operation of R1. A voltage is applied to the bus bar 43a of the third electrode group 43 to generate a beam-on voltage 63a,
Beam cutoff voltages 63b and 63c may be applied to the other busbars 43b and 43c.

Next, when the B1 signal 61-B1sig is applied to the modulation electrode 41, in order to make the beam incident only on the B1 phosphor, the beam-on voltage 62b is applied to the busbar 42b of the second electrode group 42, and the other busbars 42a, 42c are Beam cut-off voltages 62a and 62c are applied to , and the same operating voltage as in the operation of G1 is applied to each bus bar of the third electrode group 43.

Next, when the R2 signal 61-R2sig is applied to the modulation electrode 41, in order to make the beam incident only on the R2 phosphor, each generatrix of the second electrode group 42 is connected to the B1
Applying the same operating voltage as when operating the third electrode group 4
The beam-on voltage 63b may be applied to the bus bar 43b of No. 3, and the beam cut-off voltage may be applied to the other bus bars 43a and 43c.

Next, the G2 signal 61-G2sig is applied to the modulation electrode 41.
In order to make the beam incident only on the phosphor of D2 when applying
Beam-on voltage 62c to c, other busbars 42a, 4
Beam cutoff voltages 62a and 62b may be applied to the electrodes 2b, and the same operating voltages as in the operation of R2 may be applied to each bus bar of the third electrode 43.

Finally, the B2 signal 61-B2sig is applied to the modulation electrode 41.
In order to make the beam incident only on the phosphor of B2 when applying the voltage, apply the same operating voltage to each bus bar of the second electrode group 42 as in the G2 operation, and apply the same operating voltage to each bus bar of the third electrode group 43. The same voltage as when operating R1 may be applied to the bus bar.

By performing the above operation within 1H of each of the modulation electrodes 41 arranged in large numbers in parallel in the horizontal direction, an image for 1H of the transmitted television signal is displayed. By doing the same, one screen of a television can be constructed and displayed.

That is, when looking at the voltage waveform within 1H of the above operation, it becomes as shown in Fig. 7. The modulation electrode 41 has H/6
A time-series color signal 61 of R1-G1-B1-R2-G2-B2 is applied to each bus line 4 of the second and third electrode groups with a period of
2a, 42b, 42c, 43a, 43b, 43c
Beam control voltages 62a, 62b, 62c, 63a, 63b, 6 with a period of 1H and a duty of 1/3 are used.
Apply 3c. Note that the time phase difference between the beam control voltage signals applied to each bus line of each electrode group is H/3, and the time phase difference between the electrode groups is H/6.

FIG. 8 shows a second embodiment of the present invention, in which vertically long striped electrodes each having nine circular, rectangular, or slit-like openings are horizontally separated from each other and arranged side by side. The electrode group 71 is used as a modulation electrode. Next, a striped electrode having the same structure as this modulation electrode 71 is horizontally divided into three, and striped electrodes each having three openings are horizontally arranged side by side, and every two striped electrodes are separated by common bus lines 72a, 72b, 72.
c, 73a, 73b, 73c, 74a, 74b,
74c, the second, third, and fourth electrode groups 72,
73 and 74 are installed at a certain interval in the beam straight direction. At this time, the second, third, and fourth electrode groups are shifted from each other by 1/3 pitch in the horizontal direction.
75 is a mesh electrode, 76 is a fluorescent surface, 77 is a metal back electrode, and 78 is a face glass.

The above first to fourth electrode groups have a modulation electrode configuration,
The driving method is shown in FIG.

As in FIG. 5, consider one modulation electrode of the first electrode group 71. Now the R1 signal 8 is applied to the modulation electrode 71.
When 1-R1sig is applied, the beam modulated by the R1 signal is applied to the second, third, and fourth electrode groups 7.
2, 73, 74 and the fluorescent surface 76.
In order to make the beam incident only on the R1 phosphor stripe, a beam-on voltage 82a is applied to the bus bar 72a of the second electrode group, and a beam-on voltage 82a is applied to the bus bar 72a of the third and fourth electrode group.
Beam-on voltage 83c, 84c also for 3c, 74c
Just apply. However, at this time, the phosphors G1, B1, R2, G2, B2, R3, other than the phosphor position of R1,
It is necessary to prevent the beam from entering G3, B3, and for this reason, the other busbars 72b, 72c, 73a, 73b, 74a of the second, third, and fourth electrode groups,
A beam cutoff voltage is applied to 74b. Under the above operating conditions, the electron beam modulated by the R1 signal 81-R1sig applied to the modulation electrode 71 is incident only on the R1 phosphor.

Next, when the G1 signal 81-G1sig is applied to the modulation electrode 71, in order to make the beam incident only on the G1 phosphor, the operating conditions for the second and fourth electrode groups are the same as those for R1. and the bus bar 7 of the third electrode group
3a to the other busbars 73b, 73.
A beam cutoff voltage may be applied to c.

In the same way, the operating conditions for making the light incident only on the B1, B2, ..., B3 phosphors are determined, and from these R1
If the operations up to B3 are performed within 1H, the signal waveform will be as shown in FIG. 9.

The modulating electrode 71 has R1 → G1 → in sequence with a period of H/9.
A color signal 81 of B1→R2→G2→B2→R3→G3→B3 is applied, and a beam control signal voltage with a period of 1H and a duty of H/3 is applied to each bus of the second, third, and fourth electrode groups. is applied. At this time, the beam control signal voltages applied to the three busbars in each electrode group have a time phase difference of H/3, and H/9 between each electrode group.

The above explanation of the operation is for one modulating electrode 71, but by operating the multiple modulating electrodes arranged horizontally in the same way and at the same time, an image for 1H of the transmitted television signal is displayed. be able to.

Above, we have described the case of a vertically long striped electrode with 6 or 9 circular holes horizontally provided, but in the present invention, the number of holes is generally 3n (where n≧2). (integer). At this time, a first electrode group in which a large number of vertically long striped electrodes each having 3n openings horizontally separated and arranged in parallel in the horizontal direction is used as a modulation electrode, and 1/3 of the N sets of vertically long striped electrodes with openings connected to a common bus bar in the horizontal direction are arranged in parallel, and these n
A modulation electrode configuration is obtained by arranging the sets of electrode groups so as to be shifted from each other by 1/n pitch.

In this modulation electrode configuration, R, G, and B color signals are applied in time series to the modulation electrodes that are the first electrode group at a period of H/3n, and the beams modulated by each color signal emit the corresponding color fluorescence. The time phase difference between the second to (n+1)th electrodes is (1/3n)H, the period of the three busbars in each electrode group is 1H, the duty is H/3, so as to be incident on the body. Apply beam control signal voltages with a phase shift of 120°.

Note that the positions of the first to (n+1)th electrode groups are as follows:
The modulation electrode group does not necessarily need to be placed on the beam incidence side as in the embodiments of the present invention, but may be placed at any position. It goes without saying that the second to (n+1)th electrode groups may also be placed at any position.

Effects of the Invention As described above, the present invention provides 3n (n
A first electrode group in which a plurality of vertically elongated electrodes having round, rectangular, slit-shaped, etc. openings (integer ≥ 2) are separated from each other and arranged in parallel in the horizontal direction; An electrode plate is formed by forming n sets of second to (n+1) electrode groups having holes and vertically elongated electrodes connected to each other by a common bus bar and arranged horizontally with their pitches shifted by 1/n. This is a flat cathode ray tube that has modulation electrodes arranged at predetermined intervals in the thickness direction, whereas in the past, modulation electrodes were arranged for each pixel (each color phosphor stripe) in the horizontal direction. In the modulation electrode configuration in which 3n holes are provided in the horizontal direction as in the present invention, the number of modulation electrodes is reduced to 1/1.
3n becomes possible. Therefore, the difficulty in manufacturing the modulation electrodes can be solved, and the circuit for driving each modulation electrode can also be configured, thereby reducing power consumption.

[Brief explanation of drawings]

1 and 2 are an exploded perspective view and a plan sectional view showing an example of the configuration of a conventional flat panel television cathode ray tube, respectively, and FIG. 3 is a modulation electrode and fluorescent surface of a conventional flat panel television cathode ray tube. FIGS. 4 and 5 are perspective views of essential parts of an embodiment of the flat cathode ray tube according to the present invention and a cross-sectional plan view thereof, and FIG. 6 is a general operating circuit system diagram of a flat TV. , FIG. 7 is a waveform diagram illustrating the operation of the flat cathode ray tube having the configuration shown in FIGS. 4 and 5, and FIG. 8 is a plan cross-sectional view of essential parts of another embodiment of the flat cathode ray tube according to the present invention. FIG. 9 is a waveform diagram illustrating the operation of the configuration shown in FIG. 41, 42, 43...electrode group, 42a, 42
b, 42c, 43a, 43b, 43c... bus bar,
44...mesh electrode, 45...fluorescent surface, 47...
...Metal back electrode, 48...Face glass,
53...AD converter, 54...timing pulse generator, 55, 56...line memory circuit, 57...DA converter, 71, 72, 7
3, 74...electrode group, 72a, 72b, 72c,
73a, 73b, 73c, 74a, 74b, 74
c... Bus bar, 75... Mesh electrode, 76... Fluorescent surface, 77... Metal back electrode, 78... Face glass.

Claims (1)

[Claims] 1. A first electrode group in which a plurality of vertically long electrodes having 3n (an integer where n≧2) openings in the horizontal direction are separated from each other and arranged in parallel in the horizontal direction; 2 vertically long electrodes with n holes in the
N sets of 2nd to (n+1) electrode groups, which are connected by a common bus bar every other book and arranged in parallel in the horizontal direction, are installed at predetermined intervals in the direction of the electrode plate thickness with the pitch shifted by 1/n from each other. A flat cathode ray tube with modulating electrodes. 2 A video signal is applied to the first electrode group in time series with a period of H/3n, and to the other electrode groups, the duty is 1/3, the period is 1H (1 horizontal scanning time), and the phases are 2π/ 2. The flat cathode ray tube according to claim 1, wherein a beam control signal is applied having a phase difference of 3n and a phase difference of 2π/3 between the three common busbars in each electrode group.