JPS61242489A - Image display device - Google Patents

Abstract

PURPOSE:To prevent a drop of a contrast by cutting an unnecessary scattered beam, by providing an electrode having slits of the horizontal direction by the same number as the number of vertical deflecting stages, on the front of a line cathode. CONSTITUTION:In an effective vertical scanning period, an electron is emitted in a 16H period each successively toward the lower line cathode 520 from the upper line cathode 52a. The emitted electron can pass through only a slit whose upper and lower electrodes have both a high potential, of the slits made by a beam cut electrode, and cannot pass through other slit. The electron beam passes through 120 pieces of slits which have been arranged in the vertical direction as a whole by eight pieces of beam cut electrodes 53a-53h, in a 2H period each successively toward the lower part from the upper part. The beam which has passed through the beam cut electrode 53 is modulated in accordance with a video signal by a beam flow control electrode 54, also deflected to six stages in the horizontal direction, and two stages in the vertical direction, and an image is displayed as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image display device having a plurality of linear cathodes as electron sources.

Conventional technology Traditionally, cathode ray tubes have been mainly used as display elements for displaying color television images, but conventional cathode ray tubes have a very long depth compared to the screen size, making it difficult to use in thin television receivers. It was impossible to create. In addition, although EL display elements, plasma display devices, liquid crystal display elements, etc. have recently been developed as flat display elements, all of them are insufficient in terms of performance such as brightness, contrast, and color display, and have not been put into practical use. It has not yet been reached.

Therefore, the present applicant proposed a new display device in Japanese Patent Application No. 56-20618 (Japanese Unexamined Patent Publication No. 57-135590) to achieve a flat display device using electron beams.

This method generates an electron beam for each section when the screen is vertically divided into multiple sections, and displays multiple lines by deflecting each electron beam vertically for each section. However, it displays a television image as a whole.

First, a basic configuration of the image display element used here will be explained with reference to FIG. 4. This display element consists of, in order from the back to the front, a back electrode (1), a line cathode (2) as a beam source, vertical focusing electrodes (3) (3'), a vertical deflection electrode (4), and a beam current control electrode. (5), horizontal focusing electrode (
6) It consists of a horizontal deflection electrode (7), a beam acceleration electrode (8), and a screen (9), which are housed inside a flat glass bulb (not shown) that is evacuated. ing. Line cathode as beam source (2)
is stretched horizontally so as to generate an electron beam distributed linearly in the horizontal direction, and a plurality of such linear cathodes (2) are arranged vertically at appropriate intervals ((2a) to (2) in the figure).
2d) only four are shown). In this example, it is assumed that 15 are provided. them (2a
) to (2o), these wire cathodes (2) are constructed by coating the surface of a tungsten wire with a diameter of 10 to 20 μΦ with an oxide cathode material for thermionic emission. These line cathodes (2a) to (20) are heated so as to generate a thermionic beam by passing an electric current through them, and as described later, the line cathodes (2a) to (20) are heated sequentially for a certain period of time. It is controlled to emit an electron beam at a time.

The back electrode (1) suppresses generation of electron beams from line cathodes other than the line cathode controlled to emit electron beams for a certain period of time, and directs the generated electron beams only in the forward direction. It has the effect of pushing out. This back electrode (1)
may be formed by a coating of conductive material applied to the inner surface of the rear wall of the glass bulb. Moreover, a planar electron beam emitting cathode may be used instead of the back electrode (1) and the linear cathode (2).

The vertical focusing electrode (3) is a conductive plate (11) having a horizontally long slit (10) facing each of the line cathodes (2a) to (2o), and collects the electron beam emitted from the line cathode (2). taken out through the slit (10),
and vertically focused. 1 horizontal line (3
60 pixels worth of electron beams are taken out at the same time. In the diagram,
Of these, only one section in the horizontal direction is shown.

The slit (10) may be provided with crosspieces at appropriate intervals in the middle, or one through hole may be provided with multiple polarized waves at small intervals in the horizontal direction (intervals that are almost touching). The rows may be configured substantially as slits. The vertical focusing electrode (3') is also similar.

A plurality of vertical deflection electrodes (4) are arranged horizontally at intermediate positions between the slits (10),
Conductors (
13) (13') is provided. Then, a vertical deflection voltage is applied between the opposing conductors (13) (13') to deflect the electron beam in the vertical direction. In this example, a pair of electrical conductors (13)
(13') deflects the electron beam from one line cathode (2) vertically to a position corresponding to 16 lines. The 16 vertical deflection electrodes (4) constitute 15 conductor pairs corresponding to each of the 15 line cathodes (2), so that 240 horizontal lines are drawn on the screen (9). Deflect the electron beam to

Next, the control electrodes (5) are composed of conductive plates (15) each having a long slit (14) in the vertical direction, and a plurality of control electrodes (5) are arranged in parallel in the horizontal direction at a predetermined interval.

In this example, 180 control electrode conductive plates (15-1)
~(15-n) are provided. (Only nine electrodes are shown in the figure.) Each of these control electrodes (5) divides the electron beam into two picture elements in the horizontal direction and extracts it, and displays the amount of electron beam passing through each picture element. control according to the video signal. Therefore, the conductive plate for the control electrode (5) (
If 18080 pixels 15-1) to (15-n) are provided, 360 pixels can be displayed per horizontal line. Also,
In order to display images in color, each picture element is displayed using phosphors of three colors, R, G, and B, and each control electrode (5) has R and G for two picture elements.

Each video signal of B is added sequentially. In addition, 180 pairs of video signals for one line (2 pixels per pair) are simultaneously applied to each of the 180 conductive plates (15-1) to (15-n) for control electrodes (5). One line of video is displayed at one time.

The horizontal focusing electrode (6) is connected to the slit (14) of the control electrode (5).
) is composed of a conductive plate (17) having a plurality of vertically long slits (16) facing each other, and the electron beam for each pixel divided horizontally is transmitted horizontally. Focus into a narrow beam of electrons.

The horizontal deflection electrode (7) is composed of a plurality of conductive plates (1g) (18') arranged vertically on both sides of the slit (16), and each electrode (1g) ( 18') is applied with six levels of horizontal deflection voltage to deflect the electron beam of each picture element in the horizontal direction, so that two sets of R and G are displayed on the screen (9).

Each phosphor of B is sequentially irradiated to emit light. In this embodiment, the deflection range is two picture elements wide for each electron beam.

The accelerating electrode (8) is composed of a plurality of conductive plates (19) installed horizontally in the same position as the vertical deflection electrode (4), and it directs the electron beam to the screen (9) with sufficient energy. Accelerate to cause a collision.

The screen (9) is constructed by applying a phosphor (20) that emits light when irradiated with an electron beam to the back surface of a glass plate (21), and adding a metal back layer (not shown). Two phosphors (20) of three colors RlG and B are used for one slit (14) of the control electrode (5), that is, for each one electron beam divided in the horizontal direction. They are provided in pairs and are applied in vertical stripes. In FIG. 4, the broken lines drawn on the screen (9) indicate vertical divisions displayed corresponding to the plurality of line cathodes (2), and the two-dot chain lines indicate the divisions in the vertical direction that are displayed corresponding to the plurality of line cathodes (2). ) shows the horizontal divisions displayed corresponding to each of them. As shown in the enlarged view in Figure 5, one section partitioned by these two has R, G, and B phosphors (20) for two picture elements in the horizontal direction, and 16 lines in the vertical direction. It has a width of 30 minutes. For example, the size of one section is 1++a+ in the horizontal direction.

The vertical direction is 9m.

Note that in FIG. 4, the length in the horizontal direction is drawn much larger than the length in the vertical direction for clarity.

In addition, in this example, two R, G, and B phosphors (20) are used for one control electrode (5), that is, one electron beam.
Although only one pair of picture elements is provided, of course, one picture element or three or more picture elements may be provided, and in that case, the control electrode (5) has one picture element or three or more picture elements. Therefore, R, G, and B video signals are sequentially applied, and horizontal deflection is performed in synchronization with the R, G, and B video signals.

Next, the basic configuration and waveforms of each part of a drive circuit for displaying television images on this display element will be explained with reference to FIG. First, a driving portion for irradiating the screen (9) with an electron beam to emit raster light will be described. - The power supply circuit (22) is a circuit for applying a predetermined bias voltage (operating voltage) to each electrode of the display element.
3) (3') has V,,V,', horizontal focusing electrode (6
), a DC voltage of V is applied to the accelerating electrode (8), and V is applied to the screen (9).

Next, a composite video signal of a television signal is applied to the input terminal (23), and a vertical synchronization signal V and a horizontal synchronization signal H are separated and extracted in a synchronization separation circuit (24).

The vertical deflection drive circuit (40) includes a vertical deflection counter (2
5), a memory for vertical deflection signal storage (27), and a digital-to-analog converter (39) (hereinafter referred to as a DA converter). As input pulses to the vertical deflection drive circuit (40), a vertical synchronizing signal V and a horizontal synchronizing signal H shown in FIG. 7 are used. Vertical deflection counter (25)
(8 bits) is reset by the vertical synchronizing signal V and counts the horizontal synchronizing signal H.

This vertical deflection counter (25) counts the effective scanning period (in this case, a period of 240H) excluding the vertical blanking period of the vertical period, and this count output is supplied to the address of the memory (27). be done. The memory (27) outputs vertical deflection signal data (here, 8 bits) corresponding to each address, and the D-A converter (39) outputs the data of the vertical deflection signal corresponding to each address.
It is converted into vertical deflection signals of υ and υ' as shown in the figure (Fig. 6(b) D > By storing regular data in the memory, 16 levels of vertical deflection signals can be obtained.

On the other hand, the line cathode drive circuit (26) uses the vertical synchronization signal V and the output of the vertical deflection counter (25) to create line cathode drive pulses a-o. FIG. 8(,) shows the vertical synchronization signal V,
The relationship between the horizontal synchronizing signal H and the lower 5 bits of the vertical deflection counter (25) is shown. FIG. 8(b) shows a method of creating line cathode drive pulses a' to 0' every 16H using these signals. In FIG. 8, LSB indicates the lowest bit, and (LSB+1) means the bit one higher than the LSB.

The first line cathode drive pulse a' can be created with an R-S flip-flop using the vertical synchronization signal ■ and the output (LSB+4) of the vertical deflection counter (25), and the line cathode drive pulses b' to Q ′ uses a shift register,
This can be obtained by transferring the line cathode drive pulse a' using the inverted version of the output (LSB+3) of the vertical deflection counter (25) as a clock. This drive pulse a'
~0' is inverted and converted into a line cathode driving pulse a~0 which is set to a low potential only during each pulse period and set to a high potential of about 20 volts during other periods (Fig. 6(b) E). ,
It is added to each line cathode (2a) to (2o).

Each IIA cathode (2a) to (2o) has its driving pulse a-
During the high potential period o, the current is elongated to heat the device, and the heated state is maintained so that electrons can be emitted during the low potential period from drive pulse a to 0. This brings the number to 15.

Electrons are emitted from the line cathodes (2a) to (20) only during the 16H period when low potential drive pulses a to 0 are applied to each of them. During periods when a high potential is applied, the line cathode (2a )~(20) becomes positive, so the line cathode (2a)~
No electrons are emitted from (2o). Thus, in the line cathode (2), during the effective vertical scanning period, one
Electrons are emitted every 6H period. The emitted electrons are pushed forward by the back electrode (1), pass through the opposing slits (10) of the vertical focusing electrode (3), and are focused in the vertical direction to form a flat electron beam. .

Next, the line cathode drive pulse a - o and the vertical deflection signals υ, υ
The relationship with ' is explained using FIG. 9. FIG. 9(a) is a waveform diagram of a line cathode drive pulse, FIG. 9(b) is a waveform diagram of a vertical deflection signal, and FIG. 9(C) is a waveform diagram of a horizontal deflection signal.

Vertical deflection signal υ in FIG. 9(b).

υ' is 16 of each line cathode pulse a''o in Fig. 9(a).
During the H period, the IH value changes in 16 steps.

Both vertical deflection signals υ and υ' have a center voltage of v4, and υ increases sequentially and υ' decreases sequentially.
They are designed to change in opposite directions. These vertical deflection signals υ and υ' are applied to electrodes (I3) and (13') of the vertical deflection electrode (4), respectively, resulting in electron beams generated from the respective line cathodes (2a) to (2o). is vertically deflected in 16 steps, and as mentioned earlier, on the screen (9), one electron beam is deflected so that a raster of 16 lines is drawn sequentially one line at a time from the top.

As a result of the above, electron beams are emitted sequentially from the top of the 15 line cathodes (2a) to (2o) for a period of 16H, and each electron beam is sequentially emitted in one line from top to bottom within 15 sections in the vertical direction. On the screen (9), from the first line at the top to the 24th line at the bottom.
The electron beam is vertically deflected one line at a time up to the 0th line, and a total of 240 raster lines are drawn.

The vertically deflected electron beam is sent to the control electrode (5).
It is divided into 180 sections in the horizontal direction by a horizontal focusing electrode (6) and taken out. In Figure 4, one of them
The classification is shown. The amount of this electron beam passing through each section is controlled by a control electrode (5), and is focused horizontally by a horizontal focusing electrode (6) into a single narrow electron beam. The light is deflected in six steps in the direction and sequentially illuminates the RlG and B capacitive light bodies (20) for two picture elements on the screen (9). FIG. 5 shows the vertical and horizontal divisions. The phosphors corresponding to each of (15-1) to (15-n) of the control electrode (5) are R, G, and B for two picture elements, but for convenience of explanation, one picture element is R, G, and G□. , B1 and the other one is R2, G2 .
Let's call it B2.

Next, the horizontal deflection drive circuit (41) is composed of a horizontal deflection counter (28) (11 bits), a memory (29) that stores horizontal deflection signals, and a DA converter (38). . The input pulses of the horizontal deflection drive circuit (41) are a vertical synchronizing signal V and a horizontal synchronizing signal H, as shown in FIG.
A pulse 6H with a repetition frequency six times that of the horizontal synchronizing signal H is used. The horizontal deflection counter (28) is reset by the vertical synchronizing signal V and receives the horizontal six times the pulse 6.
Count H. This horizontal deflection counter (28) is applied 6 times during IH and 240Hx 6/H= during 1V.
It counts 1440 times, and this count output is stored in the memory (2
9) is supplied to the address.

The memory (29) outputs horizontal deflection signal data (here, 8 bits) according to the address, and the D-A converter (38) converts it to the data shown in Figure 10 (Figure 6 (b) C). , h'. This circuit has memory addresses for storing horizontal deflection signals corresponding to each of 6 x 240 lines, and by storing 6 pieces of regular data for each line in the memory, 6-step horizontal waves are generated during the IH period. A deflection signal can be obtained.

This horizontal deflection signal is a pair of horizontal deflection signals ri and h' that change in six steps as shown in FIG.

In both cases, the center voltage is v7, h gradually decreases, and h′
change in opposite directions so that they increase sequentially.

In these horizontal deflection signals, h' is the horizontal deflection electrode (
7) is added to the electrodes (18) and (18'). As a result, each horizontally segmented electron beam is applied to the R, G of the screen (9) during each horizontal period.

B, R, G, B (R1, G engineering, B1.Rz, Gx-8
The light is horizontally deflected so that the phosphor of 2) is sequentially irradiated for H/6 periods. Thus, in the raster of each line, the electron beam is divided into R, , G for each of the 180 sections in the horizontal direction.
, , Bt, Rx=Gx, Bz are sequentially irradiated onto each phosphor (20).

Therefore, the electron beams are R□, G for each horizontal section of each line.
□,B,,R,,G2. By modulating with the B2 video signal, a color television image can be displayed on the screen (9).

Next, the modulation control portion of the electron beam will be explained. First, the composite video signal applied to the television signal input terminal (23) is applied to the color demodulation circuit (30), where the R-Y and B-Y color difference signals are demodulated and the G-Y color difference signal is demodulated. The signals are matrix-synthesized.

Furthermore, they are combined with the luminance signal Y, R2O,B
The respective primary color signals (hereinafter referred to as R, G, and B video signals) are output. These R, G, and B video signals are applied to 180 sets of sample and hold circuits (31-1) to (31-n). Each sample hold circuit (31-1) to (31
-n) are for R, G1, B4, R2, G
, and B2. These sample and hold outputs are respectively applied to holding memories (32-1) to (32-n).

On the other hand, the reference clock oscillator (33) is composed of a PLL (phase-locked loop) circuit, etc., and in this example, the reference clock 6fsc is six times the color subcarrier fsc.
and a double reference clock 2fsc is generated. The reference clock is controlled to always have a constant phase with respect to the horizontal synchronizing signal H.

The reference clock 2fsc is a deflection pulse generation circuit (42)
signals 6H and H/6, which are six times the horizontal synchronization signal H.
Signal switching pulse r1p g>* b1+ rz+
g2. A pulse of b2 (FIG. 6(b) B) is obtained. On the other hand, the reference clock 6fsc is applied to the sampling pulse generation circuit (34), where it is delayed by one clock period by a shift register, so that the horizontal period (
The effective horizontal scanning period (approximately 50
1080 sampling pulses R1 during μ5ec)
1, G1□, B11. R-work 2. G-engineer 2. BL2tR
411G21°B21. R2□, G22. Bz2～
Rn,, Gnl, Bnl, Rn,.

Gn2. Bnz (FIG. 6(b) A) are sequentially generated, and then one transfer pulse t is generated. This sampling pulse R, ~Bn, corresponds to each picture element when one line of the video to be displayed is divided into 360 picture elements in the horizontal direction, and its position is always constant with respect to the horizontal synchronizing signal H. controlled so that

These 1080 sampling pulses R, ~Bn2 are each 180 sets of sample hold circuits (31-1)
~(31-n), and as a result, each sample-and-hold circuit (31-1) to (31-n) has R of 2 pixels each when one line is divided into 180 pieces. ,, G□, B1. R2, G2. Each video signal of B is individually sampled and held. The sample-held 180 pairs of R, G, B,
R2°G2. The video signal of B is stored in 180 sets of memories (32-1) to (3
2-n), they are transferred all at once by a transfer pulse t, and are held here for the next horizontal period. This retained R1
゜G4. B,,R,,G2. The signal B is applied to switching circuits (35-1) to (35-n). Each of the switching circuits (35-1) to (35-n) is R
1, G□, B1°R, , G, , B2, and a common output terminal for sequentially switching and outputting these input terminals.

The output of each switching circuit (35-1) to (35-n) is 180 sets of pulse width modulation (PWM) circuit (37-1)
~(37-n), where the sample-held R1. G□, B engineering R21a, t B2 The reference pulse signal is pulse width modulated according to the magnitude of the video signal and output. The repetition period of the reference pulse signal is the above signal switching pulse r1w g engineering t bll rztg
It is desirable that the pulse width is sufficiently smaller than the pulse width of ze bz, and for example, a pulse width of about 1:10 to 1:100 is used.

The outputs of the pulse width modulation circuits (37-1) to (37-n) are used as control signals for modulating the electron beam to the 180 conductive plates (15-1) to the control electrodes (5) of the display element.
(15-n) respectively. The switching circuits (35-1) to (35-n) are simultaneously controlled by switching pulses r1+gty bze rzy g2+ bz applied from the switching pulse generating circuit (36). The switching pulse generation circuit (36) generates a signal switching pulse from the deflection pulse generation circuit (42) described above.
gzv bz, each horizontal period is divided into 6 and the switching circuit (35-1) is divided into H/6.
~(35-n), R work, G1. B Eng., R., G.
2. A switching signal rap gzs bt is provided so that each video signal of B2 is time-divisionally outputted sequentially and supplied to the pulse width modulation circuits (37-1) to (37-n).

Generate rap g2t bz.

What should be noted here is that the switching circuit (35-
R1, G1 in 1) to (35-n). B1.
Supply and switching of video signals of R2°G, , B, and electron beams R1, Go, B by the horizontal deflection drive circuit (41)
1. R.

The horizontal deflection for switching the irradiation onto the phosphors G, , B is synchronously controlled so that they completely match both in timing and order. As a result, when the electron beam is irradiating the R8 phosphor, the irradiation amount of the electron beam is controlled by the R8 video signal.
Similarly, R□, G, , B□ of each picture element are controlled in the same way for R, , G, , B.

R-, G z , B z The light emission of the capacitive light body is the R of that picture element.
Each pixel is controlled by the video signals of G, G1, B, R2, G, and B2, and each picture element is displayed by emitting light according to the input video signal. Such control is performed simultaneously for 180 sets of 1 line (2 picture elements each) to display an image of 360 picture elements for 1 line, and then sequentially performed for 240 H of lines starting from the upper line to display the screen (9 ), one image will be displayed on top.

The above operations are performed on one input television signal.
This is repeated for each field, and as a result, a moving television image is displayed on the screen (9) in the same way as a normal television receiver.

Problems to be Solved by the Invention In the image display device configured as described above, the vertical deflection of each vertical section depends only on the deflection voltage of the vertical deflection electrode, and the scattered beam due to the edge of the vertical focusing electrode, etc. When this occurs, it is impossible to control this scattered beam with the vertical deflection electrode, and this uncontrollable scattered beam spreads all the way within the vertical section, causing contrast degradation.

The present invention is intended to solve these problems.

It is an object of the present invention to provide an image display device that can prevent electrons from passing through slits other than those through which the electron beam passes during vertical deflection.

Means for Solving the Problems In order to solve the above problems, the present invention divides the screen on the screen into a plurality of sections in the vertical direction, and provides a line for generating an electron beam in each vertical section. An electrode having a cathode and having horizontal slits in the same number as the number of vertical deflection stages is provided in front of the line cathode as a means for vertically deflecting the electron beam generated by the line cathode in multiple steps in each vertical section. , during multiple stages of vertical deflection within each vertical section, a low potential is applied to the electrodes on both sides of the slit through which the beam should not pass, and a high potential is applied to both sides of the slit through which the beam should pass. , the structure is such that such a slit-shaped beam cut electrode is added.

Effect: With this configuration, unnecessary scattered beams can be cut, thereby preventing a decrease in contrast.

EXAMPLE An example of the present invention will be described below based on the drawings. This embodiment differs greatly from the conventional example in that the beam cut electrode also serves as a vertical deflection electrode, and the vertical focusing electrode used in the conventional example is omitted. Further, due to limitations in electrode processing of the beam cut electrode, the vertical deflection is performed in two steps.

In FIG. 1, this display element consists of a back electrode (51), a line cathode (52) arranged vertically as a beam source (in the figure, (52a) to (5)) in order from the back to the front.
2d)), a beam cut electrode (53) which also serves as a vertical deflection electrode, a beam flow control electrode (54), a separation electrode (55), a vertical deflection electrode (56), a horizontal deflection electrode (
57), and a screen (58) are arranged and configured, and these are housed in the evacuated interior of a flat glass bulb (not shown).

As shown in FIG. 2, in this embodiment, each vertical section has eight slits, and each of the eight beam cut electrodes is separated by a slit, and the corresponding beam cut electrodes (53a) to (53h) are connected to deflect the electron beam generated by the line cathode (52) in multiple stages in the vertical direction within each vertical section.

Next, a method for driving this display element will be explained.

As shown in FIG. 3, the driving method for each line cathode is exactly the same as in the conventional example, and therefore, in the line cathode (52), the line cathode (52) is driven from the upper line cathode (52a) to the lower line cathode (52o) during the effective vertical scanning period. ), electrons are emitted sequentially for each 16H period. The emitted electrons can only pass through the slit formed by the beam cut electrode (53) in which the upper and lower electrodes are both at a high potential, and cannot pass through other slits.

The eight beam cut electrodes (53a) to (53h) include
Since the voltage shown in FIG. 3 is applied, the electron beam sequentially passes through the 120 slits arranged in the vertical direction from top to bottom for each 2H period. The beam that has passed through the beam cut electrode (53) is modulated by the beam flow control electrode (54) according to the video signal.
Further, in this embodiment, the image is deflected six steps in the horizontal direction and two steps in the vertical direction, and the image is displayed as a whole.

Effects of the Invention According to the present invention, electrons are prevented from passing through the slits other than the slits of the beam cut electrode through which the beam sequentially passes, so that unnecessary scattered beams can be completely cut off, and a decrease in contrast can be prevented.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing one embodiment of an image display element used in the image display device of the present invention, FIG. 2 is a diagram showing the electrode configuration of the image display device, and FIG. 3 is an explanation of the operation of the device. Figure 4 is an exploded perspective view of an example of an image display element used in a conventional image display device, Figure 5 is an enlarged view of the fluorescent screen of the image display element, and Figure 6 is an example of the same image display. A block diagram showing the basic configuration of the device drive circuit and waveform diagrams of each part,
FIG. 7 is a waveform diagram for explaining the operation of the vertical deflection drive circuit.
FIG. 8 is a waveform diagram for explaining the operation of the line cathode drive circuit, FIG. 9 is a waveform diagram for each drive signal, and FIG. 1O is a waveform diagram for explaining the operation of the horizontal deflection drive circuit. (52)... Line cathode, (53)... Beam cut electrode, (54)... Beam flow control electrode, (55)...
Separation electrode, (56)... Vertical deflection electrode, (57)...
・Horizontal deflection electrode, (58)...screen, (20)
...phosphor, (24) ... synchronous separation circuit, (26)
... line cathode drive circuit, (30) ... color demodulation circuit, (
40) Vertical deflection drive circuit, (41) Horizontal deflection drive circuit, (42) Deflection panel generation circuit, Agent Yoshihiro Morimoto Figure 2 S3 Figure 5, Figure 2 Cb) Cθ Fig. 7 Fig. 1 d) e゛ Fig. 1 θ

Claims (1)

[Claims] 1. The screen on the screen is vertically divided into a plurality of sections, and each vertical section has a line cathode for generating an electron beam, and the electron beam generated by the line cathode is transmitted within each vertical section. As a means for deflecting the electron beam in multiple stages in the vertical direction, an electrode having horizontal slits in the same number as the number of vertical deflection stages is provided in front of the line cathode, and only the electrodes on both sides of the slit through which the electron beam should pass are sequentially set at a high potential. The other image display devices are configured to have a low potential.