JPH0257075A - Picture display device - Google Patents

Abstract

PURPOSE:To use one and same printed circuit board for driving an electrode for controlling beam radiated on or beneath a picture display element by devising the device such that the sequence of the connection of each terminal of the beam control electrode to each output of a beam control signal generating circuit is reversed in terms of the electric circuit. CONSTITUTION:With a switch 5 thrown to the position of a switch 7, a pulse is sent to a shift register 4 in the presence of the pulse to the switch 7. Thus, whether or not a data head sent sequentially for one horizontal period is to be stored is decided by controlling the switch 5. Moreover, switches 6, 7 are thrown interlockingly to replace input/output terminals LPI, LPO. Thus, the direction of flow of a data latch pulse is controlled from the right to the left and from the left to the right. Moreover, a signal latched from the right to the left and outputted from the right to the left is latched from the left to the right and outputted from the left to the right by revising the sequence of the signals at the output by using a changeover circuit 9. Thus, one and same printed circuit board is used to drive the electrode for controlling a beam radiated on or beneath the picture display element.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is to generate an electron beam for each division when a screen is divided into a plurality of divisions in the vertical direction. The present invention relates to a device that displays a plurality of lines by vertically deflecting each electron beam to display a television image as a whole.

(Prior art) Conventionally, 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, and are It was impossible to create a television receiver for In addition, as flat display elements, EL display elements, plasma display devices, liquid crystal display elements, etc. have recently been developed, but all of them have a brightness of 1 to 1. It is insufficient in terms of performance such as color display, and has not yet been put into practical use.

Therefore, the present applicant proposed a new display device in Japanese Patent Application No. 5620618 (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 may display the television image as a whole.

First, a basic configuration of the image display element used here will be explained with reference to FIG. This display element is arranged in order from the back to the front: a back electrode 11°; a line cathode as a beam source; 2. Vertical focusing electrode 13°13', vertical deflection electrode】4. Beam current control electrode] 5° horizontal focusing electrode 16. Horizontal deflection electrode 17. A beam accelerating electrode 18J) and a snail 19 are arranged, and these are housed in the evacuated interior of a flat glass bulb (not shown). Line cathode 2 as a beam source] The line cathode 2 is stretched horizontally so as to generate an electric beam distributed linearly in the horizontal direction. There are books (only four books numbered 12-1 to 12-2 are shown in the figure). In this example, it is assumed that 15 are provided. Let them be] 2 I to 12 Y.

These green shades (→212) are made by coating the surface of a tungsten wire with a diameter of 10 to 20 μΦ with a thermoelectric preform of 11° and a oxide cathode material. The cathodes 12a to 12a are heated so as to generate a thermionic electron beam when an electric current is passed through them, and as described later, the cathodes 12a and 2o emit electron beams sequentially for a fixed period of time. The back electrode 11 is controlled to
It acts to suppress the generation of electron beams Ax from other line cathodes other than the line cathode controlled to emit the electron beam for a certain period of time, and to push out the generated electron beam only in the forward direction. . This back electrode 11 is a conductive material attached to the inner surface of the rear wall of the glass bulb.
It may be formed by one coat of Ii material. Further, a planar electron beam emitting cathode may be used instead of the back electrode 11 and the line cathode 12.

The vertical focusing electrode 13 is a conductive plate 2 having horizontally long lines 1 to 20 facing the line cathodes 12a to 12y, respectively, and directs the electron beam emitted from the line cathode 12 to the lines 1 to 20. and vertically focused. [Horizontal direction] Electron beams for a line (360 picture elements) are simultaneously extracted. In the figure, only one section in the horizontal direction is shown. The slits 20 may be provided with crosspieces at appropriate intervals in the middle, or at small intervals in the horizontal direction (the intervals are such that they almost touch each other).
It may be substantially constituted by a row of through holes provided in parallel. The vertical focusing electrode 13' is also similar.

A plurality of vertical deflection electrodes 4 are arranged horizontally in the middle of each sulin h20, and each has a conductor 23°2;3' on one side and the bottom side of the insulating substrate 22
It consists of a set of Then, a vertical deflection voltage is applied between the opposing conductors 2:3.23' to deflect the electron beam in the vertical direction.

In this embodiment, a pair of conductors 23, 23'
The electron beam from the line cathode J2 is vertically deflected to a position corresponding to 16 lines. Then, each of the 15 line cathodes 12 is provided with a s.j.
5 corresponding pairs of conductors are constructed, which ultimately deflect the electron beam to draw 240 horizontal lines on the screen 190.

Next, the control electrodes 15 are constituted by conductive plates 25 each having vertically long slots 71 to 24, and a plurality of control electrodes 25 are arranged in parallel in the horizontal direction at predetermined intervals. In this example, 180 control electrode conductive plates 25a to 25n are provided (only nine are shown in the figure). Each of the control electrodes 15 separates and extracts the electron beam by two picture elements in the horizontal direction, and controls its 31η excess in accordance with a negative video signal that displays each picture element. Therefore, the conductive plates 25a to 25n for the control electrode 15 are 1.
If 80 lines are provided, 360 picture elements can be displayed per horizontal line. In addition, in order to display images in color, each picture element is R and G.

The image is displayed using a phosphor of B color, and R, G, and B video signals for two picture elements are sequentially applied to each control electrode 15. In addition, 180 conductive plates 25a to 25 for control electrodes 15
180 sets of video signals for one line (two picture elements per set) are simultaneously applied to each of n, and the video for one line is displayed at one time.

The horizontal focusing electrode 16 includes a plurality of vertically long slits (180 slits) facing the slits 24 of the control electrode 5.
It is composed of a conductive plate 27 having 26 tr, and horizontally focuses the electron beams for each picture element into a narrow electron beam.

The horizontal deflection electrodes 17 include a plurality of conductive plates 2 arranged vertically on both sides of each of the sulins 1 to 26.
8.28', each electrode 28.2
Six levels of horizontal deflection voltage are applied to 8' to horizontally deflect the electron beam for each picture element, and sequentially irradiate two sets of R, G, and B phosphors on the screen 19. to make it emit light. In this embodiment, the deflection range is two picture elements wide for each electron beam.

The accelerating electrode 18 is composed of a plurality of conductive plates 29 provided horizontally at the same position as the vertical deflection electrode 14, and is configured to direct the electron beam to the screen 19 with sufficient energy.
Accelerate so that it collides with.

The screen 19 has a phosphor 30 applied to the back surface of a glass plate 31 that emits light when irradiated with an electron beam, and
A metal back layer (not shown) is added. The phosphor 30 is one of the phosphors 1 to 2 of the control electrode 15.
4, that is, for each horizontally divided electron beam, two pairs of three-color phosphors, R, G, and B, are provided, and are coated in stripes in the vertical direction. ing. The broken line drawn on screen 19 in Figure 3 is
The divisions in the vertical direction displayed corresponding to each of the plurality of line cathodes 12 are shown, and the two-dot chain line indicates the plurality of control electrodes 1.
5 shows the horizontal divisions displayed corresponding to each of 5. As shown in the enlarged view in Fig. 4, one section partitioned by these two has two picture elements of R, G and G pixels in the horizontal direction.
, B, and has a width of 16 lines in the vertical direction. The size of one section is 1, for example, IIwI in the horizontal direction and 9 books in the vertical direction.

Note that in FIG. 4, the length in the horizontal direction is greatly expanded relative to the length in the vertical direction for clarity.

Further, in this example, only one pair of R, G, and B phosphors 30 for two picture elements is provided for one control electrode 15, that is, for one electron beam, but of course, for one picture element or Three or more picture elements may be provided, and in that case, the control electrode 15 has R, G for one picture element or three or more picture elements.
, B video signals are sequentially applied, and horizontal deflection is performed in synchronization with them.

Next, the basic configuration of a drive circuit for displaying television images on this display element will be described with reference to FIG. 5. First, a description will be given of the drive section 8 for irradiating the screen 19 with an electron beam to emit raster light.

The power supply circuit 32 is a circuit for applying a predetermined bias voltage (operating voltage) to each electrode of the display element.
v3.1 for vertical focusing electrode 13.13'. v
, ', v6 for the horizontal focusing electrode 16, v for the accelerating electrode 18
I+, and the DC voltage of ■9 is applied to the screen 19.

Next, a composite video signal of a television signal is applied to the input terminal 33, and a synchronization separation circuit 34 separates and extracts a vertical/fourth period signal V and a horizontal synchronization signal H.

The vertical deflection drive circuit 35 includes a vertical deflection counter 36,
Memory 37 for vertical deflection signal storage. It is constituted by a digital-to-analog converter (hereinafter referred to as a D/A converter) 38. The input pulse of the vertical deflection drive circuit 35 is as follows:
The vertical synchronization signal V and horizontal synchronization signal -5) H shown in FIG. 6 are used. The vertical deflection counter 36 (8 bits) is reset by the vertical synchronizing signal V and then outputs the horizontal synchronizing signal H.
count. This vertical deflection counter 36 calculates an effective scanning period (here, a period of 240 H minutes) excluding the vertical retrace period of the vertical period, and outputs from this calculation line 1 to 1 are stored at the address of the memory 37. supplied to The memory 37 outputs vertical deflection signal data (here, 10 bits) corresponding to each address, and is converted by the D/A converter 38 into vertical deflection signals v and v' shown in FIG. In this circuit, there is a memory address for storing vertical deflection signals corresponding to each line of 240H, and by storing regular data in the memory every 16H, 66 stages of vertical deflection signals are obtained. be able to.

On the other hand, the line cathode lψ driving circuit 39 uses the vertical synchronizing signal V and the output of the vertical deflection counter 36 to create line cathode lψ driving pulses I to Y. FIG. 7(a) shows the relationship among the vertical synchronizing signal V, the horizontal synchronizing signal II, and the lower five pins of the vertical deflection counter 36. Figure 7(b) shows
A method of creating line cathode drive pulses [A' to Y'] every 1.6 I-I using these signals will be described. In Figure 7, L
, SB indicates the lowest bit, and (Ding, S R+ 1 ) is Ding, one more than S T3! - means Pinot 1~.

The first line cathode drive pulse [A'] can be created using an R-S flip-flop or the like using the vertical synchronization signal ■ and the output (LSB+4) of the vertical deflection counter 36.
The line cathode 114 motion pulses [A' to Y'] are the inverted version of the line cathode drive pulse [A'] and the output (L, S B + 3) of the vertical deflection counter 36 using a register to shift I. It can be obtained by transferring taro cards. These 11 drive pulses I' to YO'] are inverted and converted into line cathode drive pulses [I to YOJ, which are inverted and set to a low potential only during each pulse period, and set to a high potential of about 20 ports during other periods. , are added to each line cathode 12i to ]2yo.

Each line cathode 12A to 12Y is heated by a current flowing through it during the high potential of one drive pulse [I to YO], and emits electrons during the low potential period of the drive pulse [I to YO]. The heated state is maintained as if it were wet. As a result, one low-potential driving pulse [I to YO] was applied to each of the 15 line cathodes 12I to 2Y], and electrons are emitted only during the 6 T-I period. During the period in which a high potential is applied, the line cathode 12 i~ than the potential at the position of the cathode 12 is 1
Since the high potential applied to 2yo becomes positive, no electrons are emitted from the line cathodes 2i to 12yo. Thus, in the line cathode 12, during the effective vertical scanning period, electrons are emitted from the upper line cathode 12 to the lower line cathode 12, sequentially for each period.

The emitted electrons are pushed forward by the back electrode] 1, and the emitted electrons are pushed forward by the back electrode 1;
20 and is vertically focused into a flat electron beam.

Next, the line cathode drive pulses [I to Y] and the vertical deflection signal v,
The relationship with v' will be explained using FIG. The vertical deflection signals v, v' are 16 of each line cathode pulse [I to Y].
During the H period, it changes in steps of 1H and changes in 16 steps. 15', the center voltage of both the direct deflection signal ■ and V' is ■
4, they are designed to change in opposite directions to each other such that ■ increases sequentially and V' decreases sequentially.

These vertical deflection signals V and v' are applied to the vertical deflection electrodes 1 and 1, respectively. /I electrodes 23]2 and 23', so that the respective line cathodes 12
The electron beam generated from 2 yo is vertically 1
Deflected in 6 stages, as mentioned earlier, screen 19
In the above example, a raster of 16 lines is deflected with one electron beam so as to sequentially draw one line at a time starting from -.

As a result of the above, electron beams are emitted from the 15-tree line cathode 12 I ~ ] 2 Yo - 1 for a period of 1.6 H in order, and each electron beam is within a division of ] 5 in the vertical direction. By sequentially deflecting the electron beam downward from one side by 1-line, the electron beam is vertically deflected from the 1st line 1 at one end to the 240th line [1] at the C end in the screen +91 knee. A total of 240 lines of raster are drawn.

The electron beam vertically deflected in this way is connected to the control electrode]5
The image is divided into 180 sections in the horizontal direction by the horizontal focusing electrode 16 and taken out. In Figure 3, one of them
The classification is shown. The passing amount of this electron beam is controlled by a control electrode 15 for each section, and is focused horizontally by a horizontal focusing electrode 6 into a single narrow electron beam. The light is deflected in stages and sequentially irradiates each of the R2O and B phosphors 30 for two picture elements on the screen 19. FIG. 4 shows the vertical and horizontal divisions. The phosphor corresponding to each of 25a to 25n of the control electrode 15 has R for two picture elements.
,G,B, but for convenience of explanation, one picture element is represented by R, , ,G
and B1, and the other one is R2, G2. Let's call it B2.

Next, the horizontal deflection drive circuit 40 is composed of a horizontal deflection counter (11 bits), a memory 41 storing horizontal deflection signals, and a D/A converter 42. As shown in FIG. 5, the input pulse to the horizontal deflection drive circuit 40 uses a pulse 5H which is synchronized with the vertical synchronizing signal V and the horizontal synchronizing signal H, and has a repetition frequency six times that of the horizontal synchronizing signal H.

The horizontal deflection counter 43 is reset from 1 to 1 by the vertical synchronizing signal (2) and counts horizontal six times pulses 6H. This horizontal deflection counter 43 is set six times during 1H.
240H x 6 / H = 1440440 during 1■
The output of the first call 1~ is supplied to the address of the memory 41. The memory 41 outputs horizontal deflection signal data (here, 8 bits) according to the address, and the D
/A converter 42 as shown in FIG.

It is converted into a horizontal deflection signal such as h'. In this circuit, there are 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 stages are set during the IH period. The horizontal deflection signal of the wave 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. 9, both of which have a center voltage of They change in opposite directions as they increase. These horizontal deflection signals h' are the electrodes 2 of the horizontal deflection electrodes 17, respectively.
8.28'. As a result, each horizontally segmented electron beam passes through the screen 19 during each horizontal period.
R, G, B.

It is horizontally deflected so that R, G, B (R1, G, , B, , R2, G2.B,) phosphors are sequentially irradiated with I-I/6. Thus, in each line raster, the electron beam is R□ for each of the 180 horizontal sections.

G,, B1. R2, G2. Each phosphor 30 of B2 is sequentially irradiated with light.

Therefore, the electron beam is Rlg for each horizontal section of each line.
G1.1 B4. A color television image can be displayed on one screen 19 by modulating the video signals of R21G, , ) 32.

Next, the modulation control portion of the electron beam will be explained.

First, the composite video signal applied to the television signal input terminal 33 is applied to the color demodulation circuit 44, where the R-Y
The G-Y color difference signals are demodulated, the G-Y color difference signals are matrix-synthesized, and these are further combined with the luminance signal Y to form the R2O and B primary color signals (hereinafter referred to as R, G, B image signals). signal) is output. These R, G, and B video signals are processed by 180 sample and hold circuit sets 45a to 45a.
45n. Each sample and hold circuit set 45a
~4.5n are for R3, G0, B1, and R2, respectively.
For G2.

It has six sample and hold circuits for B2. These sample and hold outputs are respectively applied to holding memory sets 4'6a to 46n.

On the other hand, the reference clock oscillator 47 is composed of a p-r=T (phase-locked loop) circuit, etc., and in this embodiment, the reference clock 6 times the color subcarrier f8°.
f8° and twice the reference clock 2f. occurs. The reference clock is controlled to always have a constant phase with respect to the horizontal synchronization signal H.

The reference clock 2fso is added to the deflection pulse generation circuit 48, and the signals 6H and H/6, which are six times the horizontal synchronization signal/signal H, are added to the deflection pulse generation circuit 48.
Signal switching pulse T”□+ g1+ 1) 1+ r2
A pulse of +g2rbz is obtained. On the other hand, the reference clock 6f8c is applied to the sampling pulse generation circuit 49, where it is delayed by one clock period by the shift 1 register, etc., so that the effective horizontal scanning period (approximately 108 during 50μ5ec)
Zero sampling pulses R01 to Bn are generated in sequence, and then one transfer pulse t is generated.

These sampling pulses RII□~Bn2 correspond to each picture element when one line of the video to be displayed is divided into 360 picture elements in the horizontal direction, and their positions are always relative to the horizontal synchronizing signal J-( Controlled to remain constant.

These 1080 sampling pulses...~Bo2
180 sample and hold circuit sets 45a~
45n, and as a result, each sample and hold circuit set 45a to 45n has one line of 180
R3゜G for each two picture elements when divided into
r31. Each video signal of R2, G, , B is individually sampled and made into a hole. The sample held 180 pairs of R1,l Gl l B 1.
The video signal of R2102113 is stored in 180 memory sets 46a to 4 after completing the sample hold for one line.
6n, they are transferred all at once by a transfer pulse t, and are held here for the next horizontal period. This retained R1.
The signals +G11B, , R2, G, , B are applied to the switching circuits 50a to 50n. The switching circuits 50a-5On each have R11GI
It is composed of a 1-Rice state or analog game 1- having individual input terminals of N B l J R2 j c, , IB, and a common output terminal for sequentially switching and outputting them.

The output of each switching circuit 50a to 50r) is 180
A set of pulse width modulation (1-) WM) cycles 51a to 51.
nL was obtained from JJII, and sample holes 1 to 1 were obtained from lj,,G,.

13 +, , R2, G 2. The reference pulse signal is pulse width modulated according to the magnitude of the B2 video signal and output.

The repetition period of the reference pulse signal is -I- signal switching pulse r++ g1+ b,,y 1-2+ g2
+ B7. '7) It is desirable that the width is sufficiently smaller than the pulse width, for example, 1:10 to 1. : ], 00
A certain degree is used.

The outputs of the pulse width modulation circuits 51a to 51n are individually applied to the 180 conductive plates 25a to 25n of the control electrode 15 of the display element as control signals for modulating the electron beam. Each switching circuit 5 (la~5
0n is a switching pulse number h, +g□, b, which is generated from the switching pulse generation circuit 52.

r', +Iζ711)7.

The switching pulse generation circuit 52 receives the signal switching pulse rt+Iζ from the deflection pulse generation circuit 48 described above.

b i, + '21 gxr bv to control h
``'C*; Divide each horizontal period into 6 and divide it into I-1/6.
Switching the switching circuits 50a to 50n respectively, R,
,G,,B,,R,.

G2. Each video signal of T32 is time-divided and sequentially output, and a switching signal r□+gxr bsr rz+g2r by is generated to be supplied to the pulse width modulation circuits 51a to 51n.

What should be noted here is that the switching circuit 50a-5
R at 0n 1. l G1. I 811 R2
T 021B, video signal supply switching and horizontal deflection 1
Electron beam 'R1, G, , J, by the drive circuit 40
, R2, G2°B2 and the horizontal deflection for switching the irradiation to the phosphor are synchronously controlled so that they completely match both in timing and order. As a result, when the electron beam is irradiating the R4 phosphor, the irradiation amount of the electron beam is controlled by the R1 video signal, and G,, B,, R7, G,, B2 are similarly controlled, and each Picture element RI T 011B...
R,, G,, B2 The light emission of each phosphor corresponds to the R,,,, of the picture element.
G,, B,, R,, G2. l-3, no l fire statue i1
(Each picture element is controlled by the - symbol, and each picture element is displayed by emitting light according to the input video signal. Such control is performed simultaneously for 180 sets (2 picture elements each) for one line. An image of 360 picture elements per line is displayed, and further 240-minute lines are sequentially performed from the upper line, so that one image is displayed on the screen 19.

The following operations are repeated for each field of the input television signal, and as a result, a moving television image is displayed on the screen 19 in the same manner as in a normal television receiver.

(Problem to be Solved by the Invention) However, in the above configuration, the printed board on which the beam flow control electrode drive circuit for driving the beam flow control electrode exposed at the bottom of the image display element is formed. 4-bottom 2
It had the disadvantage that different types had to be manufactured.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a double-image display device that eliminates the disadvantages of the display and allows the same printer 1 and substrate to be connected to the downstream beam flow control electrode.

(Means for Solving the Problems) The image display device of the present invention sets the order in which each terminal of the beam flow control electrode and each output of the beam flow control signal generation circuit is
' I to the control terminal of the beam flow control signal generation circuit.
The configuration is such that the electric circuit can be reversed by applying -I' or L'.

(Function) With the above-described configuration, the present invention allows the connection between each output terminal of the printer 1 to the substrate and each beam flow control electrode to be reversed in terms of the electric circuit, and the same printer 1 to the substrate can be connected to either the upper or lower side. It can be used.

(Example) Hereinafter, an image display device according to an example of the present invention will be described with reference to the drawings. 1 and 2 show a beam flow control electrode drive signal generation circuit in one embodiment of the present invention.

In FIG. 1, 1. ．． 2.3 is a beam flow control electrode drive signal generating IC, which has n outputs, and by connecting a plurality of these ICs, all the beam flow control electrodes of this image display element can be driven. 4 is a shift register, and pulses 1. P
Simultaneously with the CK input, a clock is generated to sequentially send the input pulses from the switch 5 through the shift register 4, and the final shift register output is output to the switch 6. The output of each bit of the shift register 4 becomes a latch pulse for the memory, which latches the video data sent at the corresponding timing. The switch 5 is a switch for switching between the input from the switch 7 and T and PCK and inputting the same to the shift register 4. Switch 6.7 is an interlocking switch and is used to switch input/output terminals LPI and L1).

In FIG. 2, 8 is 1. A switching circuit for switching between the m-th output and the Tl-m-th output of the number n of IC outputs, 9 is shown within the chain line, and is a circuit for timing the signal output with a clock.

The operation of the image display device configured as described above will be explained below with reference to FIGS. 1 and 2.

Shift 1-register 4 generates a clock for sequentially sending pulses from switch 5 into shift register 4 when pulse LPCK is input. At this time, switch 5 is
, P CK side, the shift register input pulse is always present simultaneously with the clock generation, and when switch 5 is on the switch 7 side, a pulse is sent to the shift register 4 only when switch 7 has a pulse. Therefore, by controlling the switch 5, it can be determined whether or not to store the data sequentially sent during one horizontal period from the beginning. moreover,
Switches 6 and 7 move in conjunction with each other, and input/output terminals LPI and L
POs can be replaced. As a result, the direction in which the data latch pulse flows can be controlled from right to left and from left to right. Furthermore, by reversing the order of the output signals by the switching circuit 9 shown in Fig. 2, the signals that were output from right to left are latched, and the signals that were output from right to left are latched from left to right, and output from left to right. can do.

As shown in 2 below, according to this embodiment, LPI and LP○ are exchanged, and input pulses to the shift register are changed to T and P.
, CK and the pulses from the switch and by changing the order of the output terminals, the same printed circuit board can be used to drive the beam flow control electrodes provided below the image display element.

(Effects of the Invention) According to the present invention, the order of connection between the beam flow control electrode and the beam flow control electrode drive signal can be reversed, and the same printed circuit board can be connected to the beam output above and below the image display element. It can be connected to a flow control electrode, lowering the cost, and has great practical effects.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a beam flow control circuit of an image display device according to an embodiment of the present invention, Fig. 2 is a circuit diagram of the output signal switching portion of the circuit 1-H, and Fig. 3 is a conventional image display example. FIG. 4 is an enlarged front view of the image display element used in the device, FIG. 5 is a block diagram showing the basic configuration of the drive circuit for the image display element, and FIG. 6 is a vertical deflection diagram. Figure 7 is a waveform diagram to explain the operation of the drive, Figure 7 is a waveform diagram to explain the operation of the line cathode drive circuit, Figure 8 is a waveform diagram of each drive signal, and Figure 9 is the horizontal deflection lψ dynamic open circuit operation. It is a waveform diagram for explanation. 1.2.3. Beam flow control electrode drive signal generation circuit,
4. Shift I~Register, 5.6゜7. Switch,
8. Switching circuit, 9. Circuit for timing signal output with tarokku. Patent applicant Matsushita Electric Sando Co., Ltd.

Claims (1)

[Claims] a screen coated with a phosphor that emits light when irradiated with an electron beam; a line cathode that generates an electron beam in each vertical section of the screen divided into a plurality of vertical sections; Separating means for separating the generated electron beam into each horizontal section and irradiating the screen onto the screen, and deflecting the electron beam in a plurality of steps in the vertical and horizontal directions up to the screen. a beam flow control electrode that controls the amount of light emitted from each pixel on the screen by controlling the amount of electron beams separated for each horizontal section irradiated onto the screen, and each pixel of the screen. It has a focusing electrode that controls the size of light emitted by the electron beam on the phosphor surface, and a back electrode that controls the amount of electron beam from the line cathode, and stores sampled video signals in memory over one horizontal period. After that, in a circuit that converts each data into a beam flow control signal and outputs each signal to a beam flow control electrode that corresponds to the correct horizontal position on the screen, the beam flow control electrode and each signal are An image display device characterized by having a function of reversing the order of output connections.