JPS6059888A - Picture display device - Google Patents

Abstract

PURPOSE:To attain ease of manufacture of a driving IC and to improve the mounting efficiency on a display device by dividing the driving IC into two and utilizing two kinds of pulses and a DC voltage to modulate a clock. CONSTITUTION:The driving IC is divided into two segments 44A, 44B, they are arranged along a back plate, and the IC44A supplies a control signal to control electrodes 15a, 15c, 15e-15m and the IC44B supplies a control signal to control electrodes 15b, 15d-15n; thus, the control signal is applied separately to an odd number order of electrodes and an even number of electrodes. Thus, the control signal corresponding to the signal electrodes of the control electrodes 15a, 15c, 15d-15m is outputted from the IC44A and the control signal corresponding to the control electrodes 15b, 15d-15n is outputted from the IC44B.

Description

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

Conventional configurations and their problems Traditionally, cathode ray tubes have been mainly used as display elements for displaying color television images, but conventional cathode ray tubes are extremely long and thin compared to the screen size. It was impossible to create a shaped television receiver. 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, in order to achieve a flat display device using electron beams, the present applicant filed Japanese Patent Application No. 56-20618 (
A novel display device was proposed in Japanese Patent Application Laid-Open No. 58-135590.

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 example of the image display element used here will be explained with reference to FIG.

This display element includes, in order from the back to the front, a back electrode 1, a line cathode 2 as a beam source, vertical focusing electrodes 3, 3,
Vertical deflection electrode 4, beam flow control electrode 6, horizontal focusing electrode 6
, a horizontal deflection electrode 7, a beam acceleration electrode 8, and a screen plate 9 are arranged, and these are housed inside a flat glass bulb (not shown) which is made into a vacuum.

A line cathode 2 serving as a beam source is stretched horizontally so as to generate an electron beam distributed linearly in the horizontal direction, and a plurality of line cathodes 2 (here, (Only four wires, 2i to 22 are shown) are provided. In this embodiment, it is assumed that 15 pieces are provided. Let's call them 2i~2yo. These wire cathodes 2 are constructed by coating the surface of a tungsten wire with a diameter of 10 to 2 .mu..phi. with an oxide cathode material for thermionic emission.

These line cathodes 2A to 2Y are heated so as to generate a thermionic electron beam by passing an electric current through them, and as will be described later, the electron beams are generated sequentially for a certain period of time starting from the line cathode 2I. controlled to emit. The back electrode 1 suppresses generation of electron beams from line cathodes 2 other than the line cathode 2 that is controlled to emit electron beams for a certain period of time, and directs the generated electron beams only in the forward direction. It has the effect of pushing out. This back electrode 1 may be formed by a coating film of a conductive material adhered to the inner surface of the rear wall of the glass pulp. Instead of the twisted back electrode 1 and linear cathode 2, a planar electron beam emitting cathode may be used.

The vertical focusing electrode 3 is a conductive plate 11 having a horizontally long slit 10 facing each of the line cathodes 2i to 2yo, and extracts the electron beam emitted from the line cathode 2 through the slit 1o, and vertically An electron beam for one line (36o picture elements) in the source plane direction is simultaneously taken out.

In the figure, only one section in the horizontal direction is shown. The slit 1o may be provided with crosspieces at appropriate intervals in the middle, or it may be a row of through holes arranged horizontally at small intervals (nearly touching each other). It may also be configured as a slit. The vertical focusing electrode 3' is also similar.

A plurality of vertical deflection electrodes 4 are arranged horizontally at intermediate positions of the slits 1o, and conductors 13, 13' are provided on the upper and lower surfaces of the insulating substrate 12, respectively.
It is coupled with the one provided. Then, a vertical deflection voltage is applied between the opposing conductors 13 and 13' to deflect the electron beam in the vertical direction. In this embodiment, one wire cathode 2 is formed by a pair of conductors 13 and 13'.
The electron beam is deflected vertically to a position corresponding to 16 lines.

The 16 vertical deflection electrodes 4 constitute 15 pairs of conductors corresponding to each of the 15 line cathodes 2, and the electron beams are deflected to draw 240 horizontal lines on the screen 9. do.

Next, the control electrodes 5 are composed of conductive plates 15 each having a vertically long slit 14, and a plurality of control electrodes 15 are arranged in parallel in the horizontal direction at predetermined intervals. In this embodiment, 180 conductive plates 15a to 15n for control electrodes are provided (only nine plates are shown in the figure). Each of the control electrodes 5 extracts the electron beam horizontally by dividing it into two picture elements each, and controls the amount of electron beam passing therethrough according to the video signal for displaying each picture element.

Therefore, if 180 conductive plates 15a to 15n for the control electrodes 5 are provided, 360 pixels can be displayed per horizontal line. In order to display images in color, each picture element is displayed with phosphors of three colors R, G, and B, and each control electrode 5 has two picture elements of R, G, and H. Each video signal is added sequentially.

In addition, 180 sets of video signals for one line (2 pixels per set) are simultaneously applied to each of the 180 conductive plates 15a to 15n for the control electrode 5, and the video for one line is displayed at one time. Ru.

The horizontal focusing electrode 6 is composed of a conductive plate 17 having a plurality of vertically long slits 16 (180 slits) facing the slits 14 of the control electrode 5, and collects electrons for each pixel divided in the horizontal direction. Each beam is focused horizontally into a narrow electron beam.

A plurality of horizontal deflection electrodes 7 are electrically conductive plates 18 arranged vertically on both sides of the slit 16,
18', each electrode 18, 18
A six-step horizontal deflection voltage is applied to the screen 9 to deflect the electron beam of each picture element in the horizontal direction.
Above, the two sets of R, G, and B phosphors are sequentially irradiated to emit light.

In this embodiment, the deflection range is two picture elements wide for each electron beam.

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

The screen 9 is constructed by coating the back surface of a glass plate 21 with a phosphor 20 that emits light when irradiated with an electron beam, and additionally, a metal bank layer (not shown) is added thereto.

The phosphors 2o are provided with two pairs of phosphors of three colors, R2G and B, for each slit 14 of the control electrode 5, that is, for each horizontally divided electron beam. It is applied in vertical stripes.

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

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

Please note that in FIG. 1, the horizontal length is greatly expanded relative to the vertical direction for clarity.

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

Next, the basic configuration of a drive circuit for displaying television images on this display element will be explained with reference to FIG. First, one 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. ■6 for horizontal focusing electrode 6, ■8 for accelerating electrode 8, screen 9
A DC voltage of v9 is applied to.

Next, a composite video signal of a television signal is applied to the input terminal 23, and a synchronization separation circuit 24 separates and extracts a vertical synchronization signal (2) and a horizontal synchronization signal (H).

The vertical deflection drive circuit 40 includes a vertical deflection counter 26.
Memory 27 for vertical deflection signal storage. It is constituted by a DigiClue analog converter 39 (hereinafter referred to as a DA converter). The input pulse of the vertical deflection drive circuit 40 is as follows:
A vertical synchronizing signal (2) and a horizontal synchronizing signal (H) shown in FIG. 4 are used. The vertical deflection counter 25 (8 bits) is reset by the vertical synchronizing signal V and counts the horizontal synchronizing signal H. This vertical deflection counter 25 is counted during an effective scanning period (here, 2
This count output is supplied to the address of the memory 27. The memory 27 outputs vertical deflection signal data (here, 8 bits) corresponding to each address, and the DA converter 39 outputs the vertical deflection signal data (not shown in FIG. 4).

V' is converted into a vertical deflection signal. In this circuit, 24O
There is a memory address for storing the vertical deflection signal corresponding to each line of H minutes, and by storing regular data in the memory every 16 H minutes, a 16-step vertical deflection signal can be obtained. .

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

The first line cathode drive pulse [A'] can be created using an R-S flip-flop or the like using the vertical synchronization signal V and the output (LSB+4) of the vertical deflection counter 25.
The line cathode 7 drive pulses [A' to 'Y'] are obtained by using a shift register and transferring the line cathode drive pulse [A'] using the inverted version of the output (LSB+2) of the vertical deflection counter 26 as a clock. I can do it. This drive pulse [A' to Yo'] is inverted and made low potential only during each pulse period, and converted into a line cathode drive pulse [I to Yo] at a high potential of about 20 volts during other periods. , are added to each line cathode 2i to 2yo.

A current is passed between the high potential of each line cathode 2 to 3 to generate the driving pulse, and the driving pulse is heated.
The heated state is maintained so that electrons can be emitted during the low potential period (I to Y). As a result, 15 line cathodes 2-2
From Y to Y, electrons are emitted only during the 16H period when a low potential drive pulse [I to Y] is applied to each of them. During the period when a high potential is applied, the back electrode 1 and the vertical focusing electrode 3
Since the high potential applied to the line cathodes 2A to 2Y is more positive than the potential at the line cathode 2, which is determined by the bias voltage applied to the line cathodes 2A to 2Y, No electrons are emitted from yo. Thus, in the line cathode 2, electrons are sequentially emitted from the upper line cathode 2a toward the lower line cathode 2y every 16H period during the effective vertical scanning period.

The emitted electrons are pushed forward by the back electrode 1, pass through the opposing slits 10 of the vertical focusing electrode 3, and are vertically focused to form a flat electron beam.

Next, the line cathode drive pulses [I to Y] and the vertical deflection signal v
, v' will be explained using FIG.

The vertical deflection signals v and v' are each line cathode pulse [I to Y]
During the 16H period, it changes by 1H and changes to 16 steps. The center voltage of both vertical deflection signals V and V' is v4.
They are designed to change in opposite directions, such that {circle around (2)} increases sequentially and V' decreases sequentially. These vertical deflection signals V,! : v' is 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 are vertically deflected in 16 steps, as described above. As shown above, on the screen 9-H, one electron beam is deflected so as to draw 16 lines of laskus one line at a time from the top.

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

The electron beam thus vertically deflected is horizontally divided into 180 sections and extracted by the control unit wL5 and the horizontal focusing electrode 6. Figure 1 shows one of these categories. The amount of electron beam passing through each section is controlled by a control electrode 5, and horizontally focused by a horizontal focusing electrode 6 into a single narrow electron beam. The light is deflected in six steps in the direction, and is sequentially irradiated onto each of the R, G, and B phosphors 20 corresponding to two picture elements on the screen 9. FIG. 2 shows the vertical and horizontal divisions. Each of the control electrodes 5 15a~
The phosphors corresponding to 15n are R, G, and B for two picture elements, but for convenience of explanation, one picture element is R1G1. B1 and the other one is R2, G2. Let it be B2.

Next, the horizontal deflection drive circuit 41 is composed of a horizontal deflection counter (11 bits), a memory 29 storing horizontal deflection signals, and a DA converter 38. Input pulse (d) of the horizontal deflection drive circuit 41: As shown in FIG. 7, a pulse 6H is used which is synchronized with the vertical synchronization signal (2) and the horizontal synchronization signal H, and has a repetition frequency six times that of the horizontal synchronization signal H.

The horizontal deflection counter 28 is reset by the vertical synchronizing signal (2) and counts the horizontal six times pulse 6H. This horizontal deflection counter 28 counts 6 times during 1H and 240H×6/H=1440 times during IV, and this count output is supplied to the memory 29 at l/s. The memory 29 outputs horizontal deflection signal data (in this case, 8 pins 1-) according to the address, and the data is sent to the D-A converter 3.
8, it is converted into horizontal deflection signals such as h and h' shown in FIG.

This circuit has a memory at 1/s that stores horizontal deflection signals corresponding to each of 6 x 2.40 lines, and by storing 6 pieces of regular data for each line in the memory, it can be used for 1H period. A six-step wave horizontal deflection signal can be obtained.

As shown in Fig. 7, this horizontal deflection signal is a pair of horizontal deflection signals ri and h' that change in 6 steps, both of which have a center voltage of v7, where h decreases sequentially and h' increases sequentially. They change in opposite directions as they move forward. These horizontal deflection signals h are electrodes 18 and 18 of the water deflection electrode 7, respectively.
′ is added to

As a result, each horizontally segmented electron beam is applied to the R, G', B, R of the screen 9 during each horizontal period.

It is horizontally deflected so that the phosphors of G and B (horse, G1.B1.R2, G2.B2) are sequentially irradiated with H/6. Thus, in each line raster, the horizontal direction 180
The electron beam is transmitted to each section of R1, G1 . B1゜R2
, G2. Each phosphor 20 of B2 is sequentially irradiated with light.

Therefore, each horizontal section of each line has an electron beam of R1, G.
1. B1. R2, G2. By modulating with the B2 video signal, a color television image can be displayed on the screen 9.

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

Immediately, the composite video signal applied to the television signal input terminal 23 is applied to the color demodulation circuit 30, where R-Y
The G-Y color difference signals are demodulated, the G-Y color difference signals are matrix-synthesized, and they are further combined with the luminance signal Y to generate R, G, and B primary color signals (hereinafter R, G, and B). (referred to as a video signal) is output. These R, G, and B video signals are processed by 180 sample and hold circuit sets 31a to 3.
Added to 1n. Each sample and hold circuit group s 1a
~31n are for R1, G1, B1, R2, respectively.
It has six sample hold circuits for G2 and B2.

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

On the other hand, the reference clock oscillator 33 is configured as a PLL (phase-locked loop) circuit or the like, and in this embodiment, the reference clock "f" is six times as large as the color subcarrier fSC.
Generates a reference clock 2fSC that is twice as large as SC. The reference clock is controlled to always have a constant phase with respect to the horizontal synchronizing signal H. The reference clock 2fsc is added to the deflection pulse generation circuit 42, and the horizontal synchronization signal H
6 times the signal 6H and the signal switching pulse r1 for every i. q,
,b,r2. A pulse of g2°B2 is obtained. On the other hand, the reference clock 6f is the sampling pulse generation cycle 3.
4 and then delayed by one clock period by a shift register, etc., to generate 1000 sampling pulses Ra1 during an effective horizontal scanning period (approximately 60μ5ec) of the horizontal period (63.5μ passing). -Rn2 are generated sequentially, and then one transfer pulse t is generated. These sampling pulses Ra1 to Rn2 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 constant with respect to the horizontal synchronization signal H. controlled by.

These 1080 sampling pulses Ra1 to Rn2 correspond to 180 sample and hold circuit sets 31a to 3, respectively.
1n, and as a result, each sample-and-hold circuit set 31a to 31n has R1, G1 . B1
．． R2, G2. Each B2 video signal is individually sampled and held. That sample was held 18
0 pairs of R1, G1. B1°R2, G2. After completing the sample hold for one line, the B2 video signal is simultaneously transferred to 180 sets of memories 32a to 32n by a transfer pulse t, where it is held for the next horizontal period. This retained R1. G1. B1. R2, G2. The B2 signal is applied to switching circuits 35a-35n. The switching circuits 35a-35n each have R1, G1 .
B1. It is constituted by a tri-state or analog gate having individual input terminals for R2, G2 and B2 and a common output terminal which sequentially switches and outputs them.

The output of each switching circuit 35a-35n is applied to 180 sets of pulse width modulation (PWM) circuits 37a-37n, where the output is sampled and held R1, G1 . horse, R
2, G2. The reference pulse signal is pulse width modulated according to the magnitude of the B2 video signal and output. The repeating cycle of the reference pulse signal is the signal switching pulse r1. q1.
b1. r2. G2. It is desirable that the pulse width is sufficiently smaller than the pulse width of B2, for example, 1:1o to 1:1.
A value of about 00 is used.

The outputs of the pulse width modulation circuits 37a-37n are individually applied to the 180 conductive plates 15a-15n of the control electrode 5 of the display element as control signals for modulating the electron beam. Each of the switching circuits 358 to 35n receives switching pulses r1゜ql, bl, B2 . G2. Switching is controlled simultaneously by B2. The switching pulse generation circuit 36 receives the signal switching signal r1+q1. from the deflection pulse generation circuit 42 described above. b1. B2. G2. It is controlled by H/6 by dividing each horizontal period into 6.
By switching the switching circuits 35a-35n,
1. B1. R2, G2. A switching signal r1 + 91 + "1y"2 is used to time-divide and sequentially output each video signal of B2 and supply it to the Nockles width modulation circuits 37a to 37n.
1 B2 + 'J2 is generated.

What should be noted here is that the switching circuit 35a-3
R1 in 5n. G1. B1. R2, G2. B2 video signal supply switching and electron beam R1, G1 . B1. R2, G2. 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 R1.
G1. B1. R2, G2.
B2 is controlled in the same way, and the R and G of each picture element are controlled in the same way.
, B1. R2, G2. B2 The light emission of each phosphor is caused by the R1, G1 . B1. Each picture element is controlled by the R2, G, and B2 video signals, and each picture element is displayed by emitting light according to the input video signal. Such control is performed simultaneously for 180 sets of one line (2 picture elements each) to display an image of 360 picture elements for one line, and then sequentially for 240 minutes of lines starting from the upper line. One image will be displayed.

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.

As can be seen from the conventional example, the pulses Ra1Ra2° output from the sampling pulse circuit 34 in FIG.
,,Rn2. Ga1-Gn2. Ba1~Bn2 are・
The data stored in the sample hold circuit 31 is stored in time sequence in each of the sample and hold circuits 31a to 31n.

Therefore, the outputs 15a to 15n from the PWM circuit 3 are as follows.
It is time sequential.

As shown in FIG. 1, when viewed from the screen 9, the beam flow control electrodes 5 are arranged vertically and alternately as shown in FIG.

Moreover, it is difficult to implement the entire PWM circuits 3γa to 37n in one IC due to the large number of elements, problems with chip size, and power loss, so it is inevitable that they be divided.

OBJECTS OF THE INVENTION In view of the above, the present invention provides a device that can easily create an integrated circuit element for driving a display element such as a PWM circuit, and can improve mounting efficiency in a display device. The purpose is to

Structure of the Invention In the present invention, a circuit that samples and holds a video signal includes a launch circuit that stores the video signal from a predetermined time, and a shift register circuit that generates the launch pulse. By modulating the clock using two types of pulses and one DC voltage, the above-mentioned latch pulses are generated in succession, and the video signal is stored using these pulses. .

DESCRIPTION OF EMBODIMENTS An image display device according to an embodiment of the present invention will be described below with reference to drawings showing essential parts thereof.

First, FIG. 8 shows an example in which a driving integrated circuit element (IC) is divided into two parts. In this example, the IC is arranged along the back electrode 1 in FIG. 1. 44A and 44B are their driving ICs.

In the case of , the control electrode 15a is from the IC44A.

16c, 16e---16m, and from IC44B to 15b, 1esd, .

FIG. 9 shows a block diagram of a specific circuit of the present device, FIG. 1o shows a specific circuit diagram thereof, and FIG. 11 shows a waveform diagram of each part. 45 is a clock modulation circuit which modulates the clock pulse CK with two pulses Pz, P2 and a DC voltage CNTR, and applies this modulated clock to a shift register 46 for creating a lasochinoculus in the next stage.

Pulse P2 is a latch start pulse that determines which time, and this pulse is sequentially shifted by the modulation clock from the clock modulation circuit 45, and each of these pulses is applied to the launch circuit 47 to generate a video signal. latches the digital data.

I (A) in FIG. 12 and NB) in FIG. 13 show the latch timing. If the DC voltage CNTR is at a low level, it will be as shown in FIG. 12, and if it is at a high level, it will be as shown in FIG. 13. In this example, a latch is shown for the H output of the color demodulation circuit, but it can be created in the same way for G and B, just by delaying the phase by 1200 degrees.

By doing this, the IC44A in FIG. 8 outputs control signals corresponding to the signal electrodes of the control electrodes 15a, 15c, 15e, . Since a control signal corresponding to H-t5n is output, the wiring on the mounting surface becomes very simple, and it is possible to improve the mounting density and reduce the number of multilayer printed circuit boards, which also helps to lower the price.

Effects of the Invention As described above, according to the present invention, it is possible to easily manufacture a driving IC for driving an image display element having a large number of control electrodes, and to obtain an apparatus that can facilitate its mounting. It is something that can be done.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of an image display element used in an image display device invented prior to the present invention, Figure 2 is an enlarged view of the fluorescent surface of the image display element, and Figure 3 is the same image display element. Block diagrams of the drive circuit for driving the , Figures 4 and 5,
6 and 7 are waveform diagrams of various parts for explaining the operation of the drive circuit, FIG. 8 is a block diagram of an image display device according to an embodiment of the present invention, and FIG. 9 is a diagram of the drive circuit. Detailed block diagram, Figure 1o is its specific circuit diagram, Figure 11
12 and 13 are waveform diagrams for explaining the operation of the device. 2.2 I~2 Y... Line cathode, 4... Vertical deflection electrode, 5... Beam flow control electrode, 7...
...Horizontal deflection electrode, 9...Screen plate,
10...Slit, 14...Slit,
15.15a-15n... Conductive plate, 18, 1
8'... Conductive plate, 20... Fluorescent material, 23...
...Input terminal, 24...Synchronization separation circuit, 25
...Vertical deflection counter, 26...
Line cathode drive circuit, 27...memory, 28...
・Horizontal deflection counter, 29... Memory, 3
o...Color demodulation circuit, 31a to 31n...
・Sample hold circuit, 32a to 32n...
Memory, 33...Reference clock oscillator, 34.
...Sampling pulse generation circuit, 35a to 35n
...Switching circuit, 36...Switching pulse generation circuit, 37a to 37n...P
WM circuit, 38...D/A conversion circuit, 39...
...D/A conversion circuit, 4o...Vertical deflection drive circuit, 41...Horizontal deflection drive circuit, 42...
...Deflection pulse generation circuit, 43...Deflection pulse generation circuit, 44A. 44B...Drive IC, 46...Clock modulation circuit, 46...Shift register circuit, 47...Latch circuit. Name of agent Patent attorney Toshio Nakao and 1 other person −°=゛.

Claims (1)

[Claims] The screen is divided vertically into multiple sections, and an electron beam is generated for each vertical section. "The above screen"
Divide the second screen horizontally into a plurality of sections.1~ In each horizontal section, phosphors of multiple colors such as red, green, and obscene are arranged horizontally, and the electron beam is directed into the horizontal direction. Divide into sections and divide each horizontal section into step-wave water iF.
The phosphors of the plurality of colors are sequentially irradiated and emitted in each horizontal section by being deflected horizontally in counting stages for a certain period of time by a deflection voltage, and each horizontal section is determined from the received color television signal. By sampling and holding the image signal for each image, and by horizontal deflection of the electron beam for each horizontal segment, in synchronization with the irradiation of phosphors of multiple colors,
The electron beam for each horizontal section is sequentially modulated for each color using the retained video signal, and the electron beam is transmitted for a period shorter than a certain period per step in each step of the step-wave horizontal deflection voltage. The circuit for irradiating the beam onto the screen and for sampling and holding the video signal includes a latch circuit for storing the video signal from a predetermined time, and a further register circuit for generating the launch pulse. By modulating the clock applied to this using two types of pulses and one DC voltage, the latch pulses listed in -1- are generated two times in succession, and the video signal is stored using these pulses. An image display device that has the following key characteristics: