JPS61242490A - Image display device - Google Patents

Abstract

PURPOSE:To make the change of a line cathode driving circuit and a circuit of a vertical deflecting use counter, etc. unnecessary in case an image display element whose number of line cathodes is different, by using an n-ary counter which can change a natural number, as the vertical deflecting use counter. CONSTITUTION:A vertical deflecting use n-ary counter 51 counts a horizontal synchronizing signal H, outputs an address at every one pulse, reads out a vertical deflection data from a memory 52, and a deflecting signal of 10 stages is generated by a D/A converter. At the same time, a carry pulse from this n-ary counter 51 is inputted to a binary counter 53 of 5 bits, and its information if decoded by a 5 bit decoder 54. This output becomes line cathode driving signals K0-K24. By replacing a natural number (n) of the vertical deflecting use n-ary counter 51, a picture display element having the maximum 32 pieces of line cathodes can be used. As for the vertical deflecting use data in the memory 52, it is necessary to change it in advance in accordance with the number of line cathodes, but it is unnecessary to change the circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention generates an electron beam for each division when a screen on a screen is vertically divided into a plurality of divisions, and generates an electron beam for each division. The present invention relates to an apparatus for displaying a plurality of lines by vertically deflecting a beam to display a television image as a whole.

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. 2. 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), horizontal deflection electrode (7), beam acceleration/speeding electrode (8)
and a screen (9) are arranged,
These are housed within the evacuated interior of a flat glass bulb (not shown). Line cathode as beam source (
2) is stretched horizontally so as to generate an electron beam distributed linearly in the horizontal direction;
are arranged vertically at appropriate intervals ((2a in the figure)).
~(2d) only four are shown). In this example, it is assumed that 15 are provided. Those(
These wire cathodes (2), denoted 2a) to (20), 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 (2o) 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 (2o) 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 the generation of electron beams from other line cathodes other than the line cathode 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. This back electrode (1) may be formed by a coating of electrically 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 may be a row of through holes provided at small intervals in the horizontal direction (intervals that are almost touching each other) for multiple polarized waves. may be configured substantially as a slit. 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") to vertically deflect the electron beam from one line cathode (2) to a position corresponding to 16 lines.Then, 16 vertical deflection electrodes (4) deflect the electron beam from one line cathode (2) to a position corresponding to 16 lines.
Fifteen conductor pairs corresponding to each of 2) are constructed, and the electron beam is ultimately deflected to draw 240 horizontal lines on the screen (9).

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 180 lines of 15-1) to (15-n) are provided, 360 picture elements 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 sets (2 pixels per set) of video signals for 1 line 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 (18) (18') arranged vertically on both sides of the slit (16), and each electrode (18) ( 18') is marked with six levels of horizontal deflection voltage.

The electron beams for each picture element are respectively deflected in the horizontal direction, and 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). The phosphor (20) has two phosphors of three colors R2O and B 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 Figure 2, the broken lines drawn on the screen (9) indicate the pairs of lines for each of the multiple wire cathodes (2).
The two points am indicate the horizontal divisions displayed corresponding to the plurality of control electrodes (5). 1 divided by these two
As shown in the enlarged view in Figure 3, one section has R, G, and B phosphors (20) for two picture elements in the horizontal direction, and has a width for 16 lines in the vertical direction. There is. The size of one section is, for example, 1 m in the horizontal direction and 9 m in the vertical direction.
It is 1.

Note that in FIG. 2, the length in the horizontal direction is greatly expanded relative to the length in the vertical direction for clarity.

In this example, two R, G, and H 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. R, G, and B video signals are sequentially applied for the purpose, 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 explained.

The power supply circuit (22) is a circuit for applying a predetermined bias voltage (operating voltage) to each electrode of the display element.
1) has -V and vertical focusing electrode (3) (3') has V
A DC voltage of 3 t V 3 ' is applied to the horizontal focusing electrode (6), V to the accelerating electrode (8), and V 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. 5 are used. Vertical deflection counter (25) (
8 bits) are reset by the vertical synchronizing signal V and counting 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' shown in the figure (FIG. 4(b) D). This circuit has memory addresses for storing vertical deflection signals corresponding to each line for 240H, and by storing regular data in the memory every 16H, it is possible to obtain 16 levels of vertical deflection signals. can.

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 to 0. FIG. 6(a) 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. 6(b) shows a method of creating line cathode drive pulses a' to 0' every 16H using these signals. In FIG. 6, 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 by an R-S flip-flop using the vertical synchronization signal V and the output (LSB+4) of the vertical deflection counter (25), and the line cathode drive pulse b'~0 ′ 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 drive pulse a-o 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. 4(b)E). , are added to each line cathode (2a) to (2o).

Each line cathode (2a) to (20) is heated by a prolonged current during the high potential period of the driving pulses a to 0, and is heated so that it can emit electrons during the low potential period of the driving pulse a-O. State is preserved. As a result, 15 wire cathodes (2a)
From ~(20), a low potential drive pulse a'
= Electrons are emitted only during the 16H period when o is added. During periods when a high potential is applied, the line cathode (2a ) to (2o) is more positive, so no electrons are emitted from the line cathodes (2a) to (2o). Thus, at the line cathode (2), during the effective vertical scanning period, the upper line cathode (2a
) toward the line cathode (2o) below, electrons are sequentially emitted every 16H period. The emitted electrons are transferred to the back electrode (1)
The electron beam is pushed forward by the electron beam, passes through the opposing slit (lO) of the vertical focusing electrode (3), and is focused in the vertical direction to form a flat electron beam.

Next, the line cathode drive pulse a'=o and the vertical deflection signal υ
The relationship between . 7(b) is a waveform diagram of the vertical deflection signal υ of FIG. 7(b).

υ' changes by IH in 16 steps during the 16H period of each line cathode pulse a''-'o in FIG. 7(a).

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 (13) 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 2, 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 R2O, B capacitive light body (20) for two picture elements on the screen (9). FIG. 3 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 R1, G, and B1. and the other one is R,,G2. B
.

shall be.

Next, the horizontal deflection drive circuit (41) is composed of a horizontal deflection counter (2g) (11 bits), a memory (29) that stores horizontal deflection signals, and a DA converter (38). . As shown in FIG. 8, the input pulses of the horizontal deflection drive circuit (41) are synchronized with the vertical synchronizing signal V and the horizontal synchronizing signal H, and a pulse 6H having 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 6H.
count. This horizontal deflection counter (28) is
6 times during H, 240H x 6/H = 1440 during 1■
The count output is supplied to the address of the memory (29).

The memory (29) outputs the horizontal deflection signal data (8 bits in this case) according to the address, and the D-A converter (38) outputs the data as shown in Fig. 8 (Fig. 4 (b) C). ,h
' is converted into a horizontal deflection signal such as '. In this circuit, 6
There are memory addresses for storing horizontal deflection signals corresponding to each of x 240 lines.

By storing six pieces of regular data in the memory for each line, a six-step wave horizontal deflection signal can be obtained during the IH period.

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 R7, 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) to 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 (R,, GW, 13z* R,, a,
, Bt) is horizontally deflected so that the phosphors are sequentially irradiated for H/6 periods. Thus, in each line raster, the electron beam is R for each of the 180 sections in the horizontal direction.
1, G1. Bit R2, a, Bz each phosphor (2
0) are sequentially irradiated.

Therefore, the electron beam is set to R1, G for each horizontal section of each line.
1. By modulating with the B, , R, , G, , B video signals, a color television image can be displayed on the screen (9).

Next, the modulation control part of the electron beam will be explained.6 First, the composite video signal applied to the television signal input terminal (23) is applied to the color demodulation circuit (30), where R-Y and B -Y color difference signal is demodulated, G-Y color difference signal is matrix-synthesized, and further, these are combined with luminance signal Y, each primary color signal R2O, B (hereinafter R,
G, B video signals) are output. Those R,G
, B. Each video signal is processed by 180 sample and hold circuits (3
1-1) to (31-n). Each sample-and-hold circuit (31-1) to (31-n) has six sample-and-hold circuits for R0, G1, B1, R2, G2, and B2. These sample and hold outputs are stored in the holding memories (32-1) to (32-1), respectively.
- added to (b).

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 ri1gtt b1* rz+g
The pulse shown in Fig. 4(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, etc., so that the effective horizontal scanning period (approximately 5
1080 sampling pulses R during 0μ5ec)
,,,G□0. B.1. R1,, G1□+BZ□,
R,1,G,.

B, 4. R,,,G,2. B,,-Rn1. Gn
l, Bn,, Rn2゜On2. Bn, (Fig. 4 (
b) A) are generated in sequence, followed by one transfer pulse t. This sampling pulse R2□~B
n2 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 controlled to always be constant with respect to the horizontal synchronizing signal H.

These 1080 sampling pulses R11 to Bn each form 180 sets of sample hold circuits (31-1).
~(31-n') are added 6 times each, thereby each sample hold circuit (31-1) ~(31-n)
When one line is divided into 180 parts, each 2
R1, G1 for picture elements. Each video signal of Bt=Rz-Gz-Bt is individually sampled and held. The 180 sample-held pairs of R1, G, and B□
, R2°G2. The video signal of B is stored in 180 sets of memories (32-1) to (
32-n), they are transferred all at once by a transfer pulse t, and are held here for the next horizontal period. This retained R
1.

G□, B,, R,, G2. The signal B is applied to switching circuits (35-1) to (35-n). The switching circuits (35-1) to (35-n) each consist of a tri-state or analog gate having individual input terminals of R11GxtBt+R, , G, , B, and a common output terminal that sequentially switches and outputs them. It is something that

The output of each switching circuit (35-1) to (35-n) is 180 sets of pulse width modulation (PWM) circuit (37-1)
(37-n), and here, the reference pulse signal is pulse width modulated according to the magnitude of the sampled and held Rx, G-B-Rz-GK-82 video signal and is output. The repetition period of the reference pulse signal is the signal switching pulse r□9g, bl, r, as described above.

It is desirable that the pulse width be sufficiently smaller than the pulse width of gze 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 rz*gttb and *rawg2+bz applied from the switching pulse generating circuit (36). The switching pulse generation circuit (36) is a signal switching pulse rly gtt b, e ri2 from the aforementioned deflection pulse generation circuit (42).
gzt bz, each horizontal period is divided into 6, and the switching circuits (35-1) to H/6 are controlled.
Switch (35-n).

R1, G8. B1. R,,G2. Each video signal of
1) to (37-n).
Generate gls bx*r'zt gtt bz.

What should be noted here is that the switching circuit (35-
R in 1) to (35-n), G1. B1.
R.

Switching the supply of video signals G, , B, and electron beams R1, G, , B□, R2°G2 . by the horizontal deflection drive circuit (41). The horizontal deflection for switching the irradiation onto the phosphor B2 is synchronously controlled so that it completely matches both the timing and the order. As a result, when the electron beam is irradiating the R1 phosphor, the irradiation amount of the electron beam is controlled by the R□ video signal, and the G1. B
, , R, , G, , B are controlled in the same way, and the R1, G, B1°R2, G2 . B, the emission of each phosphor is R1, G1°B 1 = R2 = G
Each picture element is controlled by the video signal of 2 t B 2, and each picture element is displayed by emitting light according to the input video signal. This control is performed simultaneously for 180 sets (2 picture elements each) for 1 line, resulting in 3 pixels per line.
A 60-pixel image is displayed, and the screen (
9) One image will be displayed above.

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 As described above, in the image display device, it is necessary to change the number of line cathodes depending on the number of inches. because.

Increasing the number of inches while keeping the number of line cathodes constant will increase the deflection width of the vertical deflection, which can be achieved by increasing the distance between the vertical deflection electrode and the screen or by increasing the voltage applied to the vertical deflection electrode. etc. is necessary. However, the former is contrary to the purpose of making the image display element thinner, and the latter increases aberrations and the like and deteriorates image quality. Therefore, it becomes necessary to change the number of line cathodes. Further, with such a change in the number of line cathodes, it is also necessary to change the drive circuit. When this image display element is developed from a low inch to a high inch, it is expected that a drive circuit that is not affected by the number of inches will be required, and for this purpose, a drive circuit that is not affected by changes in the number of line cathodes is required.

Even if image display elements with different numbers of line cathodes are used,
It is an object of the present invention to provide an image display device that does not require circuit changes such as a line cathode drive circuit and a vertical deflection counter.

Means for Solving the Problem Line cathode drive circuit of conventional image display device ((2 in Fig. 4)
6)), the vertical deflection counter ((25) in Figure 4)
) and the vertical synchronization signal V to create a line cathode drive pulse. In the example of Fig. 4, the vertical deflection counter (25
) consists of a hexadecimal counter and corresponds to 15 line cathodes. Since the number of scanning lines is constant, the number of line cathodes and the number of vertical deflection steps are inversely proportional.

Therefore, the present invention solves the above problem by replacing the vertical deflection counter with an n-ary counter in which the natural number n can be freely varied.

Effect: With this configuration, the number of vertical deflection steps can be changed in accordance with changes in the number of line cathodes. Therefore, it is not necessary to change circuits such as the line cathode drive circuit and the vertical deflection counter in accordance with changes in the number of m cathodes. It disappears.

Example Embodiments of the present invention will be described below based on the drawings.

Figure 1 shows the vertical deflection n-ary counter (51) set to 1, for example, n
The case where =10 is shown. At this time, the number of line cathodes is 24. The vertical deflection n, advance counter (51) counts the horizontal synchronizing signal H, outputs an address for each pulse, reads the vertical deflection data from the memory (52), and
A 10-step deflection signal is generated by an A converter (not shown, but corresponds to (39) in FIG. 4). At the same time, a carry pulse from this n-ary counter (51) is input to a 5-bit binary counter (53), and the information is decoded by a 5-bit decoder (54). This output becomes the line cathode drive signal KO- of 24. This embodiment can be used for an image display element having a maximum of 32 line cathodes by changing the natural number n of the n-ary vertical deflection counter (51). The vertical deflection data in the memory (52) needs to be changed in advance according to the number of line cathodes, but there is no need to change one circuit.

Effects of the Invention As described above, according to the present invention, by using an n-ary counter in which the natural number n can be changed as the vertical deflection counter, line cathode driving is possible even when image display elements with different numbers of line cathodes are used. There is no need to change the circuit or the vertical deflection counter.

[Brief explanation of the drawing]

Figure 1 shows that the natural number n can be changed to the vertical deflection counter.
A block diagram showing an embodiment of the present invention using a counter, FIG. 2 is a diagram showing the internal configuration of the image display section, FIG. 3 is an enlarged view of the image display section, and FIG. 4 is the basic configuration of the drive circuit. A block diagram and a waveform diagram of each part, Figure 5 is a principle and timing diagram of vertical deflection waveform generation, Figure 6 is a principle diagram and timing diagram of line cathode drive waveform generation, Figure 7 is a line cathode drive pulse, vertical FIG. 8 is a waveform diagram showing the relationship between the deflection signal and the horizontal deflection signal. FIG. 8 is a principle diagram and a timing diagram of horizontal deflection waveform generation. (2) (2a) to (2o)... line cathode, (4)...
Vertical deflection electrode, (5)...Beam flow control electrode, (7)
...Horizontal deflection electrode, (9) ...Screen, (20
)...phosphor, (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, (
40) Vertical deflection drive circuit, (41) Horizontal deflection drive circuit, (42) Deflection pulse, (51)
... N-ary counter for vertical deflection, (53) ... Binary counter, (5j) ... 5-bit decoder agent Yoshihiro Morimoto Figure 1 Figure 4 (a) Cρ Figure 5 T

Claims (1)

[Claims] 1. The screen on the screen is vertically divided into a plurality of sections, an electron beam generation source that generates an electron beam is provided for each vertical section, and the electron beam is sequentially deflected in the vertical direction for each vertical section. An electrode for displaying a plurality of lines in each vertical section is provided, and an electron beam passage hole divided into a plurality of sections in the horizontal direction is provided in the middle of the electron beam circuit from the electron beam generation source to the screen. Alternatively, an electrode having a slit and configured to control the emission intensity by controlling the amount of the electron beam irradiated onto the screen according to the video signal is provided, and the electron beam is deflected in the horizontal direction for each horizontal section. An image display device that enables color reproduction by horizontal deflection by coating different phosphors or other light-emitting substances on the screen depending on the horizontal deflection position, and the number of rasters and line cathode An n-ary counter whose natural number n can be changed is used for the vertical deflection counter that creates a vertical deflection signal in relation to the number, and a vertical deflection signal and a line cathode are generated according to the change in the number of line cathodes by an external preset. An image display device configured so that drive pulses can be changed.