JPS60153677A - image display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention is capable of: ・Duplicating the screen on the screen in the vertical direction.

When divided into a number of sections, each section generates an electron beam, and for each section, the electron beam is deflected vertically to display multiple lines, and the entire television image is divided into two. It relates to a display device.

(Structure of conventional example and its problems) Conventionally, a cathode ray tube has been mainly used as a display element for displaying color television images.
With a cathode ray tube, the length of the tube was extremely long compared to the screen size, making it impossible to create a thin television imager. In addition, recently E
L display elements, plasma display devices, liquid crystal display elements, etc. have been developed, but all of them have a brightness of 1. It is insufficient in terms of performance such as contrast and color display, and has not yet been put into practical use.

Therefore, we need to create a flat display device using electron beams! For the purpose, when the screen is vertically divided into nine sections, an electronic vinyl is generated for each section, and each section has its own! A system was invented in which the daughter beams were deflected vertically to display a plurality of lines, resulting in a television image as a whole. ,.

First, a basic configuration example of the image display element used here will be explained with reference to FIG.

This display element includes, in order from the back to the front, a back electrode 1, a line cathode 2' as a beam source, and a vertical focusing electrode 3.
', a vertical deflection electrode 4, a beam flow control electrode 5, a horizontal focusing electrode 6, a horizontal deflection electrode 7, a beam acceleration electrode 8, and a screen 9 are arranged, and these are arranged in a flat glass bulb (as shown in the figure).

It is housed in a vacuum chamber.

The line cathode 2 as a beam source is stretched horizontally so as to generate an electron beam distributed linearly in the horizontal direction. In the figure, only four wires 2-2 are shown). In this example, it is assumed that 15 are provided.

Let's call them 2i~2yo. These wire cathodes 2 are constructed by coating the surface of a tungsten wire with a diameter of 10 to 2 .mu..phi. with an oxide cathode material for thermionic emission. These wire cathodes 2i to 2yo are heated so as to generate a thermal electron beam when a current is passed through them.
As will be described later, the line cathodes 2 and 2 are controlled to emit electron beams at regular intervals in order. Back electrode 1
suppresses the generation of electron beams from line cathodes 2 other than the line cathode 2 that is 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 toward the target. The back electrode 1 may be formed by a coating of a conductive material applied to the inner surface of the rear wall of the glass bulb. Further, a planar electron beam emitting cathode may be used to connect the back electrode 1 and the line cathode 2.

The vertical focusing electrode 3 is a conductive plate 11 having horizontally long slits 1'o facing each of the line cathodes 2i to 2yo, and allows the electron beam emitted from the line cathodes 2 to pass through the slits 1 to 10. Take out and focus vertically. Electron beams for one horizontal line (360 pixels) are taken out at the same time.

In the figure, only one section in the horizontal direction is shown. The slits 10 may be provided with crosspieces at appropriate intervals in the middle, or may be a row of through holes arranged horizontally at small intervals (or almost touching). It may also be designed substantially as a slit. The vertical focusing electrode 3' is also similar.

A plurality of vertical deflection electrodes 4 are arranged horizontally in the middle of each of the slits 10, and conductors 13, 13 are provided on the upper and lower surfaces of the insulating substrate 12, respectively.
' is provided. Then, a vertical deflection voltage is applied between the opposing conductors 13 and 13' to deflect the electron beam in the vertical direction. In this embodiment, a pair of conductors 13 and 13' deflect the electron beam from one line cathode 2 to positions corresponding to 16 lines in the vertical direction.

The 16 vertical deflection electrodes 4 constitute 15 pairs of conductors corresponding to each of the 15 line cathodes 2, and in the end, the electron beam is directed so as to draw 240 horizontal lines on the screen 9. deflect.

Next, the control electrodes 5 are composed of conductive plates 15 each having a vertically long slit 14, and a plurality of control electrodes 5 are arranged in parallel in the horizontal direction at predetermined intervals. In this embodiment, 180 conductive plates 15a to 15n for control electrodes are provided (only nine are shown in the figure). Each of the control electrodes 5 separates the electron beam into two picture elements in the horizontal direction and extracts it, and controls the amount of electron beam passing therethrough in accordance with a video signal for displaying each picture element. Therefore, if 18,080 conductive plates 15a to 15n for the control electrodes 5 are provided, 60 picture elements of 1 horizontal 1"-in fraction j'3" can be displayed. ), in order to display the image in color,
The picture elements are displayed using phosphors of three colors R, G, and H, and each control electrode 5 has R and G for two picture elements.

Each of the i video signals is sequentially added. In addition, 180 pairs of video signals for one line (2 pixels per pair) are simultaneously applied to each of the 180 conductive plates 15a to 1-5n for the control electrode 5, so that the video for one line is generated. □ The horizontal focusing electrode 6 is composed of a conductive plate 17 having a plurality of vertically long slits 16 (180 slits) facing the slits 14 of the control electrode 5, and each picture element divided into zero horizontal force. A plurality of thin electron beam horizontal deflection electrodes 7 are arranged vertically on both sides of the slit 16 on each conductive plate 1 to focus each electron beam in the horizontal direction.
8. Consisting of 1'8', each electrode 1'8'
, 18' are applied with six levels of horizontal deflection voltage to horizontally deflect the electron beam for each picture element, and sequentially illuminate two sets of R, G, and B phosphors on the screen 9. Illuminate it to make it emit light. In this example, the deflection range is two picture elements wide for each electron beam.

The acceleration electrode 8 is composed of a plurality of conductive plates 19 provided horizontally at the same position as the vertical deflection electrode 4.
The electron beam is accelerated to collide with the screen 9 with sufficient energy.

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).

The phosphors 20 are provided with two pairs of phosphors of three colors, R2G and B, for each slit 14 of the control electrode 5, that is, for each horizontally divided electron beam. It is coated vertically in stripes.

In FIG. 1, the broken lines drawn on the screen 9 indicate divisions in the vertical direction that are displayed corresponding to each of the plurality of line cathodes 2, and the two-dot chain lines correspond to each of the plurality of control electrodes 5. Indicates the horizontal division displayed. As shown in an enlarged view in FIG. 2, one section partitioned by these two has R, G, and H phosphors 20 for two picture elements in the horizontal direction.
It has a width of 16 lines in the vertical direction.

The size of one section is, for example, 1 m in the horizontal direction and 10 m in the vertical direction.

Note that in FIG. 1, the length in the horizontal direction is greatly expanded relative to the length in the vertical direction to make it easier to read.

Furthermore, in this example, R, G, and B phosphors are scarce for one control electrode 5, that is, for one electron beam.

is provided for only one pair for two picture elements, but of course, one
A picture element or three or more picture elements may be provided. In that case, R, G, and B video signals for one picture element or three or more picture elements are sequentially applied to the control electrode 5, and horizontal A deflection is made.

Next, the basic configuration 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) Apply a DC voltage of v6 to the horizontal focusing electrode 6, v8 to the accelerating electrode 8, and v9 to the screen 9.

Next, a composite video signal of a television signal is applied to the input terminal 23, and a synchronization separation circuit 24 separates and extracts a vertical synchronization signal V° and a horizontal synchronization signal H.

The vertical deflection drive circuit 40 includes a vertical deflection counter 25.
Memory 27 for vertical deflection signal storage. It is constituted by 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. 4 are used. The 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 is counted during an effective scanning period (here, 2
40H), and this count output is supplied to the address of the memory 27. The memory 27 outputs vertical deflection signal data (here, 8 bits) corresponding to each address, and the DA converter 39 outputs the data of the vertical deflection signal as shown in FIG.

V' is converted into a vertical deflection signal. In this circuit 240
There is a memory address for storing the vertical deflection signal corresponding to each line of H minutes, and by storing regular data in the memory every 16H minutes, it is possible to obtain a 16-step vertical deflection signal. .

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 generate a line cathode drive Noculus [
I~Yo]. Figure 5 (,) 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. 5(b) shows the line cathode drive nolls [A' to Y'] every 16H using these signals.
We will show you how to make one. In FIG. 5, 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 using an R-S flip-flop or the like using the vertical synchronization signal V and the output (LSB+4) of the vertical deflection counter 25.
The line cathode drive/gurus [mouth' to 'yo'] is transferred using a shift register using the inverted output (LSB+3) of the manual deflection counter 25 as the clock. You can get help by doing it. This driving pulse (line cathode drive in which the potential is inverted and set to a low potential only during each pulse period, and the potential is set to a high potential of about 20 delts during other periods) 9 pulses [I to Yo] converted to
A current is applied to each of the line cathodes 2I to 2Y during the high potential of the drive pulse [I to YO], and the current is applied to each line cathode 2I to 2Y to heat the drive pulse.
The heated state is maintained so that electrons can be emitted during the low potential period (I to Y). As a result, the position drive/e Lus [I ~
Electrons are emitted only during the 16H period when y] is added.

During the period when a high potential is applied, the potential at the position of the linear cathode 2 determined by the bias voltage applied to the back electrode 1 and the vertical focusing electrode 3 is also
Since the high potential applied to 2yo becomes positive, no electrons are emitted from the wire cathodes 2i to 2yo. Thus, in the line cathode 2, during the effective vertical scanning period, 16
Electrons are emitted every H 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 A'rus [I to Y] and the vertical deflection signal y
, y/ will be explained using FIG. 6(a) is a waveform diagram of a line cathode pulse, (b) is a waveform diagram of a vertical deflection signal, and (c) is a waveform diagram of a horizontal deflection signal. FIG. 6(b) Vertical deflection signals v and v' are shown in FIG.
a) I during the 16H period of each line cathode/gurus [I~Yo]
It changes in 16 steps by changing by H minutes. Vertical deflection signal V
and V' both have a center voltage of v4, and are configured to change in opposite directions so that (2) increases sequentially and V' decreases sequentially. These vertical deflection signals V and V' are applied to the electrodes 13 and 13' of the vertical deflection electrode 4, respectively, and as a result, the electron beams generated from the respective line cathodes 2I to 2Y are deflected in 16 steps in the vertical direction. is,
As mentioned above, on the screen 9, one electron beam is deflected so as to sequentially draw 16 lines of raster lines one line at a time from the top to the square.

As a result of the above, electron beams are emitted for each period of 16)I in order from the one above the 15-line cathodes 2A to 2Y, and each electron beam is emitted from above to below within 15 sections in the vertical direction. By being sequentially deflected one line at a time, the electron beam is vertically deflected one line at a time on the screen 9 from the first line at the top end to the 240th line at the F end, and a total of 240 raster lines are drawn.

The electron beam thus vertically deflected is horizontally divided into 180 sections by the control electrode 5 and the horizontal focusing electrode 6 and extracted. Figure 1 shows one of these categories. The amount of 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 thin electron beam.
The light is deflected horizontally in six steps by the horizontal deflection means described below, and is sequentially irradiated onto each of the R, G, and B phosphors 20 corresponding to two picture elements on the screen 9. FIG. 2 shows the vertical and horizontal divisions. Control electrodes 5 15a to 15, respectively
The phosphors corresponding to n are R, G, and B for two picture elements, but for convenience of explanation, one picture element is assumed to be R1+G 1 + B 1 and the other is assumed to be R2* 02 r B 2.

The horizontal deflection drive circuit 41 includes a horizontal deflection counter (11
(bit), a memory 29 storing horizontal deflection signals, and a DA converter 38. The input pulses of the horizontal deflection drive circuit 41 are synchronized with the vertical synchronizing signal V and the horizontal synchronizing signal H as shown in FIG.
Pulse 6H with twice the repetition frequency is used.

The horizontal deflection counter 28 is reset by the vertical synchronizing signal V and counts the horizontal six-fold pulse 6H. This horizontal deflection counter 28 counts 6 times during IH and 240H×6/H=1440 times during 1V, and this count output is supplied to the address of the memory 29. From the memory 29, horizontal deflection signal data (
Here, 8 bits) are output, and 'D-A converter 38
Then, it is converted into horizontal deflection signals such as h and h' shown in FIG.

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, it is possible to A deflection signal can be obtained.

As shown in Fig. 7, this horizontal deflection signal is a pair of horizontal deflection signals ri and h' that change in 6 steps, both of which have a center voltage of v7, where h decreases sequentially and h' increases sequentially. They change in opposite directions as they move forward. These horizontal deflection signals h' are electrodes 18 and 1 of the horizontal deflection electrode 7, respectively.
8' is added. As a result, each horizontally divided electron beam is transmitted to the R, G of the screen 9 during each horizontal period.
,B.R.

It is horizontally deflected so that the phosphors of G and B (R11Gs, B11R2, G2.B2) are sequentially irradiated with H/6. Thus, in each line raster, the electron beams are R,, Gl, Bl, for each of the 180 sections in the horizontal direction.
R2゜G 2. , B2 are sequentially irradiated.

Therefore, the electron beam is R1r for each horizontal section of each line.
An image modulated by the video signal of G 1 + B 1 + R2 + G 21 B 2 can be displayed.

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 -Y color difference signal is demodulated, the G-Y color difference signal is combined with IJ, and further,
These are combined with the luminance signal Y to output R, G, and H primary color signals (hereinafter referred to as R, G, and B video signals).

These R, G, and B6 video signals are sent to 180 sets of sample and hold circuits 31a to 31a. Each sample hold time introduction 3ta to 31n is for B0 and G
It has six sample and hold circuits for I, Bl, R2+G2, and B2.

These sample and hold outputs are respectively applied to holding memory sets 32a'' 32n.

On the other hand, the reference clock oscillator 33 is composed of a PLL (phase-locked loop) circuit, etc., and in this example, a reference clock 6/sc that is six times the color subcarrier fsc and a reference clock 27s'c that is twice the color subcarrier fsc are used. Occur. The reference clock is controlled to always have a constant phase with respect to the horizontal synchronizing signal H.

The reference clock 2fsc is added to the deflection pulse generating circuit 42, and a signal 6H which is six times the horizontal synchronizing signal H and a signal switching pulse r4+glJ1+r2+g2+)1 every 624 are added.
I am getting 2 pulses. On the other hand, standard riro, Tsuku 6 fs
c is sampling/? 1,080 samples are added to the pulse generating circuit 34, and are delayed by one clock period by a shift register, etc., during an effective horizontal scanning period (approximately 50 μsec) of the horizontal period (635 μsec). A' pulses Ral-Bi2 are generated in sequence, followed by one transfer pulse t. This sampling signal Ral~Bn2 corresponds to each picture element in the image to be displayed, and its position is controlled so that it is always constant with respect to the horizontal synchronization signal H.
Each of the Sangling No. 4 Rus Ral~Bn2 is 1
Six pieces are added to each of the 80 sample and hold circuit groups 31a to 31n, and thereby the hold circuit groups 31a to 31n
When one line is divided into 180 parts, each video signal of R1+G1+B11R2+G2+B2 corresponding to two picture elements is individually sampled and held. The sample-held 180 pairs R,, G1. B11
R,,G2. The video signal of B2 is stored in 180 sets of memories lj 32 a to 32 n after the sample hold for one line is completed.
The signals are transferred all at once by the transfer pulse L and held here for the next horizontal period. This retained R1. G...
B,,R2,G2. The signal of B2 is sent to the switching circuit 35
Added to a~35n. Switching circuit 35a
~35 n is Rlh G in B lh
It is constructed of a tri-state or analog dart having individual input terminals of R2+G2+B2 and a common output terminal that sequentially switches and outputs them.

The output of each switching circuit 35'a to 35n is applied to 180 pairs of pulse width modulation (PWM) circuits 37a to 37n, where the sampled and held R 1 +
G 1 * B 1 , R2r G 2 , B 2
The reference Noyals signal is /F pulse width modulated according to the magnitude of the video signal and output. The repeating period of the reference/yellow signal is the above signal switching pulse r 1 + g 1
It is desirable that the nosolus width is sufficiently smaller than the nosolus width of + b 1 * r 2 * g 2 + R2, and for example, one of about 1:1'O to 1:100 is used.

The outputs of the narrow pulse width modulation circuits 37a-37n are individually applied to the control electrodes 50180 conductive plates 15a-15n of the display element as control signals for modulating the electron beam. The switching circuits 35a to 35n are simultaneously controlled by switching pulses r1+gl and b1+r2+g2+t12 applied from the switching pulse generating circuit 36. The switching pulse generation circuit 36 receives signal switching pulses rl+gl, b1+r2+g2 . Each horizontal period is divided into 6 and the switching circuits 35a to 35n are switched by H/6.
lh B 1 r Each video signal of R2, 02B2 is time-divided and output sequentially, and e pulse width modulation circuits 37a to j7
Switching signals r1, gs, bl, r2,
What should be noted here is that R 1 + in the switching circuits 35 a to 35 n
G 1 r B 1 r R2r G 2 + B
2 video signal supply switching and the electron beam R,,Gll Bll R21G21 by the horizontal deflection drive circuit 41
The horizontal deflection for switching the irradiation to the phosphor B2 is synchronously controlled so that it completely matches both the timing and the order. Due to this, the electron beam is R
When the electron beam is irradiated onto the Gll 81 phosphor, the irradiation amount of the electron beam is controlled by the R1 video signal.
, R2+ 02+ B 2 is similarly controlled, and R1+ G1 + B lh R21G21 of each picture element
B2 The light emission of each party light is caused by the R1, G1 . Bll
They are each controlled by the video signals of R2+"2rB2, and each picture element is displayed by emitting light according to the input video signal.

This control is 180. N, (2 pixels each) is performed simultaneously to display an image of 360 pixels in one line, and then sequentially from the upper line to the 240 minute line to display one image on the screen 9. That will happen.

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.

By the way, in the conventional example described above, as shown in FIG. 8(a), each of the line cathodes 2A to 2Y has a single-acting nosolus applied to one end a, and the other end is grounded via a diode D. The direction in which the driving force is applied to each line cathode is the same. Naturally, the wire cathode has electrical resistance, so when the drive line is at a high potential, the heating current flowing from the a side to the b side causes the potential at the a side to be higher than the b side, and the drive line is at a low potential. In this case, the electric current caused by the electrons emitted from the line cathode 2 flows from the b end to the a end, so that the potential at the b end is higher than that at the a end. This potential gradient does not pose a problem during a period when the drive pulse is at a high potential, but becomes a problem during a period when the drive pulse is at a low potential and electrons are emitted from the line cathode 2. That is, during this period, the potential difference between the line cathode 2 and the vertical focusing electrode 3 (see Figure 1) is normally
It is set so that the potential of the vertical focusing electrode 31'' is higher than 1;Ey fc, so that it is smaller on the b-end side than on the a-end side.Therefore, the velocity of the electron beam emitted from the line cathode 2 is smaller on the a-end side than on the a-end side. The side width also becomes smaller on the b side, and the result appears as a difference in the vertical polarization, and as shown in Fig. 8(b), the vertical direction of the electron beam received by each line cathode 2A to 2Y is The irradiation range Kl''KI5 of one section becomes gradually narrower from the b-end force 1 to the a-end.

As a result, uneven gaps (hereinafter referred to as horizontal lines Y) are created in the irradiation range K of the electron beams of adjacent line cathodes (hereinafter referred to as horizontal lines Y), which causes a serious visual problem.

(Object of the Invention) The present invention eliminates such conventional drawbacks, and aims to provide an image display device in which horizontal lines do not pose a visual problem without adding any circuits.

(Structure of the Invention) The present invention is characterized in that a pulse for driving each line cathode is applied from different directions to adjacent line cathodes, thereby eliminating the need for adding any circuit. It is possible to make horizontal lines so that they do not become a visual problem.

(Description of Embodiment) An embodiment of the present invention will be described below with reference to the drawings. In FIG. 9(a), it is assumed that 15 line cathodes 2 are provided. The drive signal from the line cathode drive circuit 26 is applied to the a terminal of the line cathode 2A, and the b terminal is grounded via the diode D. On the other hand, in the adjacent line cathode 20, the drive nozzle is applied to the b end, and the a end is grounded via the diode D. Hereinafter, drive pulses are applied alternately to the a and b ends of adjacent line cathodes.

First, in the line cathode 2a, during the period when the drive/gurus is at a low potential and the stain is emitted, the potential at the h end is higher than the potential at the a end as in the conventional example, so the line cathode The potential difference between the two ends is smaller at end b than at end a. (vertical focusing electrodes usually have a lower potential than the line cathode) is small. Therefore, the amount of deflection that the electron beam receives when passing through the vertical deflection electrode is larger on the b-end side than on the a-end side. It also becomes narrower on the a-end side. On the other hand, in the line cathode 20, the drive pulse is applied to the b end, so the range 2 that the electron beam irradiates in the vertical direction on the screen is the line cathode 20.
By irradiating □ in the vertical direction of 2A and 20, which is opposite to A, the gap between the areas 9 and 9 can be made almost uniform as shown in FIG. 9(b). In the same way, the horizontal line Y of the adjacent and contacting line cathodes below is almost uniform, and it is possible to obtain an image without any visual problems at 6°2τ:τ
２lE＊'□jQ. 11. . , 4'/L, 7 i 11
By applying voltage from different directions to line cathodes having i=li, it is possible to make the horizontal lines on the screen almost uniform in tl, and it is possible to provide a good image display device with no visual problems. can.

[Brief explanation of the drawing]

Fig. 1 is an enlarged view of the fluorescent surface of one display element used in the image display device of the present invention, Fig. 3 is a block diagram showing the basic configuration of the drive circuit of the image display element, and Fig. 4 is a vertical deflection drive. Figure 5 is a waveform diagram to explain the operation of the circuit. Figure 5 is a waveform diagram to explain the operation of the line cathode drive circuit. Figure 6 is a waveform diagram of each drive signal. Figure 7 is the operation of the horizontal deflection drive circuit. FIG. 8(a) is a waveform diagram for explaining the conventional method of applying drive/voltage to the line-pole. FIG. Figure 9 (
FIG. 9A is a diagram showing the configuration of essential parts of an all-image display device in an embodiment of the present invention, and FIG. 9B is a diagram showing the state of horizontal lines on the screen in the present invention. 2.2 I~2 Y... Line cathode, 4. Vertical deflection electrode, 5.
...Beam flow control - pole, 7...Horizontal deflection electrode, 9...
Screen, 10... Female Lit, 20... Fluorescent body,
・23...Input terminal, 24...Synchronization separation circuit, 25
...Vertical deflection counter, 26... Line cathode drive circuit, 27... Memory, 28... Horizontal deflection counter, 29... Memory, 30... Color demodulation circuit, 31a~
31n...sample hold circuit, 32a to 32n.
...Memory, 33...Reference clock oscillator, 34...
・Sansoling pulse generation circuit, 35a to 35n...
Switching circuit, 36... Switching pulse generation circuit, 37 IL to 37 n-PWM circuit, 38-D/A
converter, 39...D/A converter, 40...vertical deflection drive circuit, 41...horizontal deflection drive circuit, 42...deflection pulse generation circuit. Fig. 2 0 Water jfL25 1 division Fig. 4 Fig. 5 (a) (b)

Claims (1)

[Claims] a screen having a plurality of line cathode electron beam generation sources, a phosphor that emits multiple lights when irradiated with the electron beam, and a focusing electrode that focuses the fine electron beam generated by the electron beam generation source; An electrostatic flat electrode that deflects the electron beam until it reaches the screen. Control to control the amount of electron beam irradiation to the screen and control the emission intensity! An image display device comprising a display element having a pole, etc., in which the wire cathode is driven by a wire, and the wire cathode is driven by a wire cathode. 1. An image display device characterized in that a pulse is applied from different directions to adjacent line cathodes.