JPH0636585B2 - Image display device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to generate an electron beam for each section when a screen on a screen is divided into a plurality of sections in the vertical direction, and to generate an electron beam for each section. The present invention relates to a device for deflecting a beam in a vertical direction to display a plurality of lines and displaying a television image as a whole.

2. Description of the Related Art Conventionally, a cathode ray tube has been mainly used as a display element for displaying a color television image, but the conventional cathode ray tube has a very long depth compared to the size of the screen, and a thin television receiver. Was impossible to create. In addition, although EL display elements, plasma display devices, liquid crystal display elements, etc. have been recently developed as flat plate display elements, none of them are sufficient in terms of performance such as brightness, contrast and color display, and are put to practical use. Has not reached the end.

To achieve a flat panel display device using an electron beam, the present applicant has filed Japanese Patent Application No. 56-20618 (Japanese Patent Laid-Open No. 57-1618).
No. 35590) proposed a new display device.

This is because when the screen on the screen is divided into a plurality of sections in the vertical direction, an electron beam is generated for each section, and each electron beam is deflected in the vertical direction to display a plurality of lines. However, the television image is displayed as a whole.

First, a basic configuration of the image display device used here will be described with reference to FIG. This display device comprises a back electrode (1), a line cathode (2) as a beam source, a vertical focusing electrode (3) (3 '), a vertical deflection electrode (4), and
Beam current control electrode (5), horizontal focusing electrode (6), horizontal deflection electrode (7), beam accelerating electrode (8) and screen (9) are arranged and configured, and these are flat glass bulbs (Fig. It is housed inside a vacuumed chamber (not shown).
The line cathode (2) as a beam source is stretched horizontally so as to generate an electron beam that is linearly distributed in the horizontal direction, and a plurality of such line cathodes (2) are vertically arranged at appropriate intervals. Books (only four (2a) to (2d) are shown in the figure) are provided. In this example, 15 are provided. Let them be (2a) to (2o). These wire cathodes (2) are formed by coating a surface of a tungsten wire of 10 to 20 μφ with an oxide cathode material for emitting thermoelectrons. These line cathodes (2a) to (2o) are heated so that a thermoelectron beam can be generated by passing an electric current therethrough, and as described later, the line cathodes (2a) are sequentially heated for a certain period of time. The electron beam is controlled to be emitted one by one. The back electrode (1) suppresses the generation of the electron beam from other line cathodes other than the line cathode that is controlled to emit the electron beam for a certain period of time, and directs the generated electron beam only in the forward direction. And push it out. This back electrode (1) may be formed by a coating film of a conductive material attached to the inner surface of the rear wall of the glass bulb. Further, a plane electron beam emitting cathode may be used instead of the back electrode (1) and the line cathode (2).

The vertical focusing electrode (3) is a conductive plate (11) having a long slit (10) in the horizontal direction facing each of the line cathodes (2a) to (2o).
The electron beam emitted from the line cathode (2) is taken out through the slit (10) and focused in the vertical direction. An electron beam for one horizontal line (360 picture elements) is simultaneously extracted. In the figure, only one horizontal section 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 side by side at a small horizontal interval (an interval at which they are almost in contact with each other). May be configured as. The vertical focusing electrode (3 ') is also the same.

A plurality of vertical deflection electrodes (4) are arranged horizontally in the middle of each of the slits (10), and conductors (13) and (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 conductors (13) and (13 ') facing each other to deflect the electron beam in the vertical direction. In this embodiment, one wire cathode (2) is formed by a pair of conductors (13) (13 ').
The electron beam from is vertically deflected to the position of 16 lines. The 16 vertical deflection electrodes (4) form 15 pairs of conductors corresponding to each of the 15 line cathodes (2), and eventually 240 horizontal lines are drawn on the screen (9). Deflect the electron beam to.

Next, the control electrode (5) is composed of a conductive plate (15) each having a slit (14) which is long in the vertical direction, and a plurality of the control electrodes (5) are arranged side by side in the horizontal direction at a predetermined interval. In this example
180 conductive plates (15-1) to (15-n) for control electrodes are provided. (Only 9 are shown in the figure). This control electrode
In (5), each electron beam is divided into two picture elements in the horizontal direction and taken out, and the passing amount thereof is controlled according to a video signal for displaying each picture element. Therefore,
If 180 conductive plates (15-1) to (15-n) for the control electrode (5) are provided, 360 picture elements can be displayed per horizontal line. Also, in order to display the image in color, each picture element has R, G,
Display with three color phosphors of B, and each control electrode (5)
, R, G, and B video signals corresponding to two picture elements are sequentially added to. In addition, 180 conductive plates (15-1) to (15-) for control electrodes (5)
180 sets of video signals for one line (two picture elements per set) are simultaneously added to each of n), and the video for one line is displayed at one time.

The horizontal focusing electrode (6) is composed of a conductive plate (17) having a plurality of vertically long (180) slits (16) opposed to the slits (14) of the control electrode (5). The divided electron beams of each picture element are focused in the horizontal direction to form a narrow electron beam.

The horizontal deflection electrodes (7) are a plurality of conductive plates (18) arranged vertically on both sides of the slit (16).
(18 '), each electrode (18) (18')
6 levels of horizontal deflection voltage are applied to horizontally deflect the electron beam for each picture element, and the screen (9)
The above two sets of R, G, and B phosphors are sequentially irradiated to emit light. The deflection range is the width of two picture elements for each electron beam in this embodiment.

The accelerating electrode (8) is composed of a plurality of conductive plates (19) horizontally provided at the same position as the vertical deflection electrode (4), and the electron beam is applied to the screen (9) with sufficient energy. Accelerate to make it collide.

The screen (9) is constructed by coating the back surface of the glass plate (21) with a phosphor (20) that emits light when irradiated with an electron beam, and adding a metal back layer (not shown). The phosphor (20) is a phosphor of three colors of R, G, B for one slit (14) of the control electrode (5), that is, for each electron beam divided in the horizontal direction. Are provided in pairs of two, and are applied in stripes in the vertical direction. In Fig. 2, the broken lines on the screen (9) indicate the vertical divisions of the plurality of line cathodes (2) corresponding to each other, and the two-dot chain line indicates the plurality of control electrodes (5). The horizontal divisions displayed corresponding to each of the above. As shown in the enlarged view of FIG. 3, there are R, G, and B phosphors (20) for two picture elements in the horizontal direction, and 16 lines in the vertical direction. It has a width of minutes. The size of one section is, for example, 1 in the horizontal direction.
mm, vertical direction is 9 mm.

It should be noted that in FIG. 2, the length in the horizontal direction is drawn to be much larger than that in the vertical direction for the sake of clarity.

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

Next, the basic structure of the drive circuit for displaying a television image on this display element and the waveforms of the respective parts will be described with reference to FIG. First, the drive part for irradiating the screen (9) with an electron beam to cause the raster to emit 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. The back electrode (1) is -V ₁ , and the vertical focusing electrodes (3) (3 ') are. the V _3, V ₃ ', the horizontal focusing electrode (6) V _6, V ₈ in accelerating electrode (8), the screen (9) applies a DC voltage of V _9.

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

The vertical deflection drive circuit (40) includes a vertical deflection counter (25), a vertical deflection signal storage memory (27), and a digital-analog converter (39) (hereinafter referred to as DA converter). As the input pulse of the vertical deflection drive circuit (40), the vertical synchronizing signal V and the horizontal synchronizing signal H shown in FIG. 5 are used.
The vertical deflection counter (25) (8 bits) is reset by the vertical synchronizing signal V and counts the horizontal synchronizing signal H. The vertical deflection counter (25) counts an effective scanning period (here, a period of 240 H) excluding the vertical blanking period of the vertical cycle, and this count output is stored in the memory (2
It is supplied to the address of 7). Vertical deflection signal data (8 bits here) corresponding to each address from the memory (27)
Is output and the D-A converter (39) outputs the signal shown in FIG. 5 (FIG. 4 (b)).
It is converted into vertical deflection signals of ν and ν'shown in D). In this circuit, there is a memory address that stores the vertical deflection signal 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.

On the other hand, the line cathode drive circuit (26) uses the vertical synchronizing signal V and the output of the vertical deflection counter (25) to drive the line cathode drive pulses a to o.
To create. FIG. 6 (a) shows the relationship between the vertical synchronizing signal V, the horizontal synchronizing signal H, and the lower 5 bits of the vertical deflection counter (25). FIG. 6 (b) shows a method for producing the line cathode drive pulses a'to o'for each 16H by using these signals. In FIG. 6, LSB indicates the lowest bit, and (LSB + 1) means a bit one higher than the LSB.

The first line cathode drive pulse a'is RS by using the vertical synchronizing signal V and the output (LSB + 4) of the vertical deflection counter (25).
It can be created by a flip-flop or the like, and the line cathode drive pulses b ′ to o ′ are output from the vertical deflection counter (25) (LS) by using a shift register to output the line cathode drive pulse a ′.
It can be obtained by transferring the inverted version of B + 3) as a clock. The drive pulses a'to o'are inverted and set to the power failure position only during each pulse period, and the line cathode drive pulse a which is set to a high potential of about 20 V in the other periods.
~ O (Fig. 4 (b) E) and each wire cathode (2a) ~ (2o)
Added to.

Each of the line cathodes (2a) to (2o) is heated by the current being lengthened during the high potential of the driving pulse a to o, and the driving pulse a to o is increased.
The heating state is maintained so that electrons can be emitted during the low potential period of. As a result, electrons are emitted from the 15 line cathodes (2a) to (2o) only during the 16H period in which the low-potential drive pulses a to o are applied. During the period when a high potential is applied, the potential of the line cathode (2a) is higher than the potential at the position of the line cathode (2) defined by the bias voltage applied to the back electrode (1) and the vertical focusing electrode (3). No electrons are emitted from the line cathodes (2a) to (2o) because the high potential applied to () to (2o) becomes more positive. Thus, in the line cathode (2), during the effective vertical scanning period, electrons are sequentially emitted from the upper line cathode (2a) toward the lower line cathode (2o) for 16H periods. 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 vertically focused into a flat electron beam. .

Next, the linear cathode drive pulses a to o and the vertical deflection signals ν and ν '
The relationship with and will be described with reference to FIG. Fig. 7
(a) is a waveform diagram of a linear cathode drive pulse, (b) is a waveform diagram of a vertical deflection signal, and (c) is a waveform diagram of a horizontal deflection signal. Fig. 7
The vertical deflection signals .nu. and .nu. 'in (b) change in 1H increments in 16 steps during the 16H period of each cathode pulse a to o in FIG. Both of the vertical deflection signals ν and ν ′ have a center voltage of V ₄ , and ν gradually increases and ν ′ gradually decreases so that they change in opposite directions. These vertical deflection signals ν and ν ′ 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 (2a) to (2o) Is vertically deflected in 16 steps, and as described above, one electron beam is deflected so that a raster of 16 lines is sequentially drawn one line at a time from the top.

As a result of the above, electron beams are emitted for 16H periods in order from the one above the 15 line cathodes (2a) to (2o), and each electron beam is one line from the top to the bottom in 15 vertical sections. By deflecting each minute, the electron beam is vertically deflected one line at a time from the first line at the upper end to the 240th line at the lower end on the screen (9), and a raster of 240 lines in total is drawn.

The electron beam vertically deflected in this way is divided into 180 sections in the horizontal direction by the control electrode (5) and the horizontal focusing electrode (6) and is extracted. FIG. 2 shows one of them. The passing amount of this electron beam is controlled by the control electrode (5) for each section, and the horizontal focusing electrode (6)
Is focused in the horizontal direction into a single thin electron beam, which is horizontally deflected in six steps by the horizontal deflection means described below to produce R, G, and R for two picture elements on the screen (9).
B Each phosphor (20) is sequentially irradiated. FIG. 3 shows vertical and horizontal divisions. Each of the control electrodes (5) (1
The phosphors corresponding to 5-1) to (15-n) are R, G, and B for two picture elements.
However, for convenience of explanation, one picture element is R ₁ , G ₁ , B ₁ and the other is R ₂ , G ₂ , B ₂ .

Next, the horizontal deflection drive circuit (41) is a horizontal deflection counter.
(28) (11 bits), memory that stores the horizontal deflection signal
(29) and a DA converter (38). The input pulse of the horizontal deflection drive circuit (41) is synchronized with the vertical synchronizing signal V and the horizontal synchronizing signal H as shown in FIG. 8, and a pulse 6H having a repetition frequency of 6 times the horizontal synchronizing signal H is used. The horizontal deflection counter (28) is reset by the vertical synchronizing signal V and counts horizontal 6 times pulse 6H. This horizontal deflection counter (28) has 6 times during 1H and 240H × 6 during 1V.
/ H = 1440 times is counted, and this count output is stored in memory (2
Supplied to address 9). The memory (29) outputs horizontal deflection signal data (8 bits in this case) according to the address, and the DA converter (38) outputs the data (FIG. 4 (b)).
It is converted into horizontal deflection signals such as h and h'shown in C). This circuit has a memory address for storing the horizontal deflection signal corresponding to each of 6 × 240 lines, and by storing 6 pieces of regular data for each line in the memory, a 6-step wave is generated in 1H period. Can be obtained.

The horizontal deflection signal is 'a, both of central voltage is V _7, h is sequentially decreased, h' a pair of horizontal deflection signals h and h that varies six stages as shown in FIG. 8 is sequentially increased As they do, they change in opposite directions. These horizontal deflection signals h and h'are respectively supplied to the electrodes (18) of the horizontal deflection electrode (7).
Added to (18 '). As a result, the electron beams divided in the horizontal direction are R, G, B, R, G, B (R ₁ , G ₁ , B ₁ , R ₂ , G ₂ of the screen 9 during each horizontal period. ，
The phosphor of B ₂ ) is horizontally deflected so as to be sequentially irradiated for H / 6 periods. Thus, in the raster of each line, the electron beam is R ₁ , G for every 180 horizontal sections.
_The phosphors (20) of ₁ , B ₁ , R ₂ , G ₂ , and B ₂ are sequentially irradiated.

Therefore, an electron beam R ₁ ,
A color television image can be displayed on the screen (9) by modulating with the video signals of G ₁ , B ₁ , R ₂ , G ₂ , and B ₂ .

Next, the modulation control part of the electron beam will be described. 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 BY color difference signals are demodulated, G-Y color difference signals are matrix-synthesized, and further, they are combined with the luminance signal Y to obtain R, G, B primary color signals (hereinafter R, G). , B video signal) is output. The R, G, B video signals are 180 sets of sample hold circuits (31-1) to (31-n).
Added to. Sample hold circuit (31-1) to (31-
n) are for R ₁ , G ₁ , B ₁ , R ₂ , G ₂ and B _{2 respectively.}
It has six sample and hold circuits for The sample and hold outputs are stored in the holding memory (32-1) ~
Added to (32-n).

On the other hand, the reference clock oscillator (33) is composed of a PLL (phase locked loop) circuit or the like, and in this example, generates a reference clock 6sc which is 6 times the color subcarrier sc and a reference clock 2sc which is 2 times the color subcarrier sc. The reference clock is controlled so as to always have a constant phase with respect to the water synchronizing signal H. The reference clock 2sc is a pulse generation circuit for deflection.
Signals 6H and H which are added to (42) and are 6 times the horizontal synchronizing signal H.
Signal switching pulse r ₁ , g ₁ , b ₁ , r ₂ , g ₂ ,
The pulse of b ₂ (FIG. 4 (b) B) is obtained. On the other hand, the reference clock 6sc is applied to the sampling pulse generation circuit (34), where it is delayed by one clock cycle by the shift register, etc., so that the effective horizontal scanning period (about 50 μsec) of the horizontal period (63.5 μsec). 1080 sampling pulses R ₁₁ , G ₁₁ , B ₁₁ , R ₁₂ , G ₁₂ , B ₁₂ ,
R ₂₁ , G ₂₁ , B ₂₁ , R ₂₂ , G ₂₂ , B _{22 to} Rn ₁ , Gn ₁ ,
Bn ₁ , Rn ₂ , Gn ₂ and Bn ₂ (FIG. 4 (b) A) are sequentially generated, and then one transfer pulse t is generated. The sampling pulses R _{11 to} Bn ₂ correspond to respective picture elements when one line of the image to be displayed is divided into 360 picture elements in the horizontal direction, and their positions are always constant with respect to the horizontal synchronizing signal H. Controlled to be.

These 1080 sampling pulses R _{11 to} Bn ₂ are
Six samples are added to each of 180 sets of sample-hold circuits (31-1) to (31-n).
In 1) to (31-n), the video signals of R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , and B ₂ of each two picture elements when one line is divided into 180 are individually Is sampled and held at. The 180 sets of sample-held R ₁ , G ₁ , B ₁ , R ₂ , G
The video signals of ₂ and B ₂ are simultaneously transferred by the transfer pulse t to 180 sets of memories (32-1) to (32-n) after the sample and hold for one line is completed, and here during the next one horizontal period. Retained. The held signals of R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , and B ₂ are applied to the switching circuits (35-1) to (35-n).
The switching circuits (35-1) to (35-n) each have R ₁ ,
It is configured by a tri-state or analog gate having individual input terminals of G ₁ , B ₁ , R ₂ , G ₂ , B ₂ and a common output terminal for sequentially switching and outputting them.

The outputs of the switching circuits (35-1) to (35-n) are applied to 180 sets of pulse width modulation (PWM) circuits (37-1) to (37-n), where the sample-held R ₁ , G ₁ , B ₁ ,
The reference pulse signal is pulse-width modulated and output according to the magnitudes of the R ₂ , G ₂ , and B ₂ video signals. The repetition cycle of the reference pulse signal is the above-mentioned signal switching pulse r ₁ , g ₁ , b
It is desirable that the pulse width is sufficiently smaller than the pulse width of ₁ , r ₂ , g ₂ and b ₂ , 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, and 180 conductive plates (15-1) to ( 15-n) are added individually. The switching circuits (35-1) to (35-n) are simultaneously switched and controlled by the switching pulses r ₁ , g ₁ , b ₁ , r ₂ , g ₂ , b ₂ applied from the switching pulse generation circuit (36). . The switching pulse generation circuit (36) is controlled by the signal switching pulses r ₁ , g ₁ , b ₁ , r ₂ , g ₂ , b ₂ from the deflection pulse generation circuit (42) described above, and each horizontal period is Dividing into 6 and switching the switching circuits (35-1) to (35-n) by H / 6, R ₁ , G ₁ , B ₁ , R ₂ , G ₂ ,
The switching signals r ₁ and B ₂ are supplied so that each of the video signals of B ₂ is time-divided and sequentially output to be supplied to the pulse width modulation circuits (37-1) to (37-n).
g ₁ , b ₁ , r ₂ , g ₂ , b ₂ are generated.

Note that the switching circuits (35-1) to (3
5-n) switching of supply of video signals of R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B ₂ and electron beams R ₁ , G ₁ , B ₁ , R by the horizontal deflection drive circuit (41). _It means that the horizontal switching of the switching of irradiation of ₂ , G ₂ and B _{2 to} the phosphors is synchronously controlled so as to be completely matched in both timing and order.
As a result, when the R ₁ phosphor is irradiated with the electron beam, the irradiation amount of the electron beam is controlled by the R ₁ image signal, and the G ₁ , B ₁ , R ₂ , G ₂ , and B ₂ are similarly controlled. Then, the emission of each phosphor of R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B _{2 of} each picture element is changed to R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B of that picture element. would be respectively controlled by the _second video signal is the respective picture element is a light emitting display according to the video signal input.
This control is simultaneously performed for 180 pairs of one line (two pixel elements each), 360-pixel image of one line is displayed, and further 240H line is sequentially performed from the upper line, and the screen (9) One image will be displayed on top.

Then, the various operations as described above are performed by the input television signal 1
This is repeated for each field, and as a result, a moving image of television image is displayed on the screen (9) like a normal television receiver.

Problems to be Solved by the Invention In the image display device as described above, it is necessary to change the number of linear cathodes depending on the number of inches. This is because when the number of linear cathodes is kept constant and the number of inches is increased, the deflection width of vertical deflection becomes wider, and therefore the distance between the vertical deflection electrode and the screen is increased, or the applied voltage of the vertical deflection electrode is increased. It is necessary to raise it. However, the former goes against the purpose of thinning the image display element, and the latter increases aberrations and the like to deteriorate the image quality. Therefore, it becomes necessary to change the number of linear cathodes. Further, it is necessary to change the drive circuit according to such a change in the number of line cathodes. When this image display device is developed from low inches to high inches, it is expected that a drive circuit that is not affected by the number of inches will be required, and for that purpose, a drive circuit that is not affected by the change in the number of line cathodes is required.

Even if the present invention uses image display elements having different numbers of line cathodes,
An object of the present invention is 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 Problems The line cathode drive circuit of the conventional image display device ((2 in FIG.
6)), a line cathode drive pulse is created from the output of the vertical deflection counter ((25) in FIG. 4) and the vertical synchronizing signal V. In the example of FIG. 4, the vertical deflection counter (25) is composed of a hexadecimal counter and corresponds to 15 line cathodes. Since the number of scanning lines is constant, the number of linear cathodes and the number of steps of vertical deflection 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 changed.

With this configuration, the number of steps of vertical deflection can be changed according to the change in the number of line cathodes, and therefore it is not necessary to change the circuits such as the line cathode drive circuit and the vertical deflection counter according to the change in the number of line cathodes. .

Embodiments Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a case where the n-ary counter for vertical deflection (51) is set to n = 10, for example. At this time, the number of linear cathodes is 24. The vertical deflection n-ary counter (51) counts the horizontal synchronizing signal H,
An address is output for each pulse, vertical deflection data is read from the memory (52), and a DA converter (not shown,
Equivalent to (39) in FIG. 4), a deflection signal of 10 steps is created. At the same time, the carry pulse (carry pulse) from the 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 signals K0 to K24. In this embodiment, by changing the natural number n of the vertical deflection n-ary counter (51), it can be used in an image display device having a maximum of 32 line cathodes. The vertical deflection data in the memory (52) needs to be changed in advance according to the number of line cathodes, but the circuit need not be changed.

As described above, according to the present invention, by using the n-ary counter capable of changing the natural number n as the vertical deflection counter, even when the image display elements having different numbers of linear cathodes are used, the linear cathode driving is performed. There is no need for circuit deflection such as circuits and counters for vertical deflection.

[Brief description of drawings]

FIG. 1 shows that the natural number n can be changed to the vertical deflection counter n.
FIG. 2 is a block diagram showing an embodiment of the present invention using a binary counter, FIG. 2 is a diagram showing an internal configuration of an image display unit, FIG. 3 is an enlarged view of the image display unit, and FIG. 4 is a basic configuration of a drive circuit. FIG. 5 is a block diagram showing waveforms of various parts, FIG. 5 is a principle and timing diagram of vertical deflection waveform generation, FIG. 6 is a principle diagram and timing diagram of generation of a linear cathode drive waveform, FIG. 7 is a linear cathode drive pulse, vertical FIG. 8 is a waveform diagram showing the relationship between the deflection signal and the horizontal deflection signal, and FIG. 8 is a principle diagram and a timing diagram for generating the horizontal deflection waveform. (2) (2a) to (2o) …… line cathode, (4) …… vertical deflection electrode, (5)
...... Beam flow control electrode, (7) ...... Horizontal deflection electrode, (9) ......
Screen, (20) …… Phosphor, (24) …… Synchronous separation circuit,
(25) …… Vertical deflection counter, (26) …… Line cathode drive circuit, (27) …… Memory, (28) …… Horizontal deflection counter, (2
9) Memory, (30) Color demodulation circuit, (40) Vertical deflection drive circuit, (41) Horizontal deflection drive circuit, (42) Deflection pulse, (51) Vertical Deflection n-ary counter, (53) …… binary counter, (54) …… 5-bit decoder

Claims (1)

[Claims] 1. A screen on a screen is vertically divided into a plurality of sections, and a line cathode is provided as an electron beam generation source for generating an electron beam for each vertical section, and an electron beam is provided for each vertical section. A vertical deflection electrode for sequentially deflecting in the vertical direction to display a plurality of lines for each vertical section, and for each vertical section, an electron beam passage hole divided into a plurality of sections in the horizontal direction or An electron beam control electrode having a slit is provided to control the emission intensity of the screen by controlling the amount of irradiation of the screen by the electron beam according to a video signal. An image in which a horizontal deflection electrode for deflecting the light is provided, and different phosphors or other luminescent substances are applied on the screen in accordance with the horizontal deflection position to enable color reproduction by horizontal deflection. The vertical deflection drive circuit for applying a voltage to the vertical deflection electrode is an n-ary counter that can be preset externally, and a vertical deflection signal storage for inputting a counter output from the n-ary counter to an address terminal. A memory and a D / A converter for D / A converting the data output of the vertical deflection signal storage memory, and the output of the D / A converter is applied to the vertical deflection electrode;
An image display device comprising a drive circuit for the line cathode using a decoder for decoding the output of the n-ary counter.