JPS58106974A - Picture display - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a screen on a screen is vertically divided into a plurality of sections, a '[Lr- beam is generated in each section, and each electron beam is divided into a plurality of sections in the vertical direction. This relates to a device for displaying a television image as a whole by displaying a plurality of lines by deflecting the image into the vertical direction, and performing accurate vertical deflection so that each line can be correctly displayed in a predetermined position on one screen. The purpose is to provide a device that can do this.

Conventionally, cathode ray tubes have been mainly used as display elements for displaying color television images, but conventional cathode ray tubes have a very long depth compared to the screen size, making it difficult to create thin television receivers. It was impossible to do so. In addition, RL optical display elements have recently been used as flat display elements. Lasma display devices, liquid cage display elements, etc. have been developed.

All of them are insufficient in terms of performance such as brightness, contrast, and color reproducibility of color display, and have not yet been put into practical use.

Therefore, we aimed to achieve a device that can display color television images on a flat display device using electron beams, and we divided the screen on the screen vertically into multiple sections. For each section, each electron beam is deflected in the vertical direction to display a plurality of lines, and further divided into a plurality of sections horizontally, and each section is divided into R, G, A television image is displayed as a whole by causing the B, etc. phosphors to emit light sequentially, and by controlling the amount of electron beam irradiation to the R, G, B, etc. phosphors using a color video signal. something was invented.

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

This display element is arranged in order from the rear (from the rear) to the front.

A back electrode 1, a line cathode as an electron beam source 2. Vertical focusing electrode 3.3', vertical deflection electrode 4. Electron beam flow control electrode5. It consists of a horizontal focusing electrode 6, a horizontal deflection electrode 7, an electron beam accelerating electrode 8, and a screen plate 9, which are housed in a vacuum inside a flat glass bulb (not shown). . A line cathode 2 serving as an electron beam source is stretched horizontally so as to generate an electron beam distributed linearly in the horizontal direction.P9. Such a line cathode 2
are vertically spaced at appropriate intervals (here, 2 to 2)
(Only 4 pieces of 22 are shown). In this embodiment, it is assumed that 16 pieces are provided. Let's say 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. Then, as will be described later, the electron beams are controlled to be emitted sequentially from the upper line cathode 2a for a fixed period of time. The back electrode 1 creates a potential gradient with a vertical focusing electrode 3, which will be described later, and prevents the generation of electron beams from other line cathodes 2 other than the line cathode 2 which is controlled to emit electron beams for a certain period of time. It acts to suppress and push out the generated electron beam only in the forward direction. 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. Further, instead of the back electrode 1 and the line cathode 2, a one-plane electron beam emitting cathode may be used.

The vertical focusing electrode 3 is a conductive plate 11 having a horizontally long slit 1o facing each of the line cathodes 2a to 2yo, and extracts the electron beam emitted from the line cathode 2 through the slit 1o, and Focus vertically.

The slits 1o may be provided with crosspieces fJi at appropriate intervals in the middle, or may be a row of through holes provided in a large number at small intervals in the horizontal direction (so that they almost touch each other). Alternatively, it may 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 consists of a set of 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 configuration example, one wire cathode 2 is formed by a pair of conductors 13 and 13'.
The electric r-beam is deflected vertically to a position corresponding to 16 lines.

The 16 vertical deflection electrodes 4 constitute 16 pairs of conductors corresponding to each of the 16 line cathodes 2, and the electron beam is deflected to draw 240 horizontal lines on the screen 9. Have a child.

Next, the control electrodes 6 are composed of conductive plates 16 each having a vertically long slit 14, and a plurality of control electrodes 6 are arranged horizontally in parallel at predetermined intervals. In this configuration example, 32.0 control electrode conductive plates 15a to 15n are provided (only 10 are shown in the figure). Each of the control electrodes 5 divides the electron beam horizontally into one picture element and extracts it, and controls the amount of the electron beam passing therethrough in accordance with a video signal for displaying each picture element.

Therefore, if 320 control electrodes 6 are provided, 320 picture elements can be displayed per horizontal line.

In addition, in order to display images in color, each picture element is R, G.
, H will be displayed using phosphors in three colors.

The R, G, and H video signals are sequentially applied to each control electrode 6. In addition, 320 sets of video signals for one line are simultaneously applied to the 320 control electrodes 6, and the video for one line is displayed at one time.

The horizontal focusing electrode 6 has a plurality of vertically long (320) lines facing the slit 14 of the control electrode 6.
It is composed of a conductive plate 17 having a conductive plate 16, and focuses electron beams for each picture element divided horizontally into a narrow electron beam.

The horizontal deflection electrode 7 is a plurality of conductive plates 1 arranged vertically at intermediate positions between the above-mentioned strips 16.
8, a horizontal deflection voltage is applied between each of them to deflect the electron beam of each picture element in the horizontal direction, and each of the R, G, and B phosphors on the screen 9. are sequentially irradiated to emit light. The deflection range is
In this embodiment, each electron beam has a width of one picture element.

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 so as to collide with the screen 9 with sufficient force.

The screen 9 is constructed by applying a phosphor 2o 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).

For each slit 14 of the control electrode 601'-), that is, for each horizontally divided electron beam, one pair of phosphors 20 is provided for each of the three colors RlG and B. 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 6. Indicates the horizontal division displayed. As shown in the enlarged view in Fig. 2, one section partitioned by these two has R, G, and B phosphors 20 for one pixel in the horizontal direction, and 16 lines in the vertical direction. It has a width of For example, the size of one section is 1M in the horizontal direction.
M, the vertical direction is 16MM.

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

Further, in this embodiment, only one pair of R, G, and B phosphors 20 for one picture element is provided for one control electrode 6, that is, one electron beam, but for two or more picture elements. Of course, two or more pairs of picture elements may be provided, and in that case, R, (r, B video signals for two or more picture elements are sequentially applied to the control electrode 5.

Horizontal deflection is performed in synchronization with this.

Next, the basic configuration of a drive circuit for displaying television images on this display element will be explained with reference to FIG. First, a driving section for irradiating the screen 9 with an electron beam to cause the phosphor to emit light and generate a raster 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.

-V+ on back electrode 1, Vs on vertical focusing electrode 3.3'
, Vs', a DC voltage of 0 Va is applied to the horizontal focusing electrode 6, a DC voltage of 0 Va is applied to the V-shima accelerating electrode 8, and a DC voltage of V9 is applied to the screen 9.

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

The vertical drive pulse generation circuit 26 is configured with a counter etc. that is reset by the vertical retrace pulse and counts the horizontal pulses, and is used for an effective vertical scanning period (in this case, 240H) excluding one vertical retrace period of the vertical period. 16 drive pulses [a], [mouth], . This driving pulse is applied to the wire cathode drive circuit 26, and is inverted here to be at a low potential only during each pulse period, and at a voltage of approximately 20 volts during the other periods. Linear cathode drive pulses made to high potential (A'), (-'
:]......[Yo'], each line cathode, 2i, 20. ......I lost my strength to 0 after 2yo. Each line cathode 2
stomach.

・・・・・・2yo is the driving pulse [A′] ~ [Yo′]
A current is flowing between the high potentials of
The heated state is maintained so that electrons can be emitted even during the low potential period from ] to [yo']. With this, 16 wire cathodes 2
Low potential drive pulses from A to 2 Yo respectively [A']
Electrons are emitted only during the 16H period when ~[Y'] is added. During periods when high potentials are applied.

This is because the high potential applied to the line cathodes 2i to 2yo is more positive than the potential at the position of the line cathode 2 determined by the bias voltage applied to the back electrode 1 and the vertical focusing electrode 3. In addition, no electrons are emitted from the line cathodes 2i to 2yo. Thus.

At the line cathode 2, during the effective vertical scanning period.

1 in order from the upper line cathode 2A to the lower line cathode 2Y.
Electrons are emitted every 6H period. The emitted electrons are pushed forward by the back electrode 1.

passing through opposing slits 10 of the vertical focusing electrode 3;
The beam is vertically focused into a flat electron beam.

Next, as will be described later, the vertical deflection drive circuit 27 includes a counter that is reset 7) by the vertical synchronization signal and counts the horizontal synchronization signal, a digital memory addressed by the count output, and a digital memory read from the digital memory. A pair of step-like waveform vertical deflection signals v, v' that change in 16 steps by 1H during the 16H period of each vertical drive pulse [A] to [Y].
occurs.

The vertical deflection signals V and V' both have a center voltage of v4, so that m increases sequentially and v/ decreases sequentially.
They are designed to change in opposite directions. These vertical deflection signals V and V' are applied to the electrode 1 of the vertical deflection electrode 4, respectively.
3 and 13' and the result.

The electron beams generated from each of the line cathodes 2a to 2o are vertically deflected in 16 steps, and as mentioned earlier, on the screen 9, one electron beam sequentially scans 16 lines of raster lines from the top. It is deflected to draw one line at a time.

As a result of the above, electron beams are emitted for 16H periods in order from above the 160-line cathodes 2A to 2Y, and each electron beam is deflected by 1 line from above to below within 16 sections in the vertical direction. Screen 9
At the top, the electron beam is vertically deflected sequentially from the first line at the top end to the 240th line at the bottom end by 1347 minutes to draw a raster of 240 lines in total.

The electron beam thus vertically deflected is horizontally divided into 320 sections by the control electrode 6 and the horizontal focusing electrode 6 and extracted. Figure 1 shows one of these categories. The amount of electron beam passing through each section is controlled by a control electrode 6, and is focused in the horizontal direction by a horizontal focusing electrode 6 to become one thin electron beam.
The light is deflected horizontally in three stages by the horizontal deflection means described below, and is sequentially irradiated onto each of the R, G, and H phosphors 20 on the screen 9.

That is, the horizontal drive pulse generation circuit 28 is composed of three monostable multivibrators connected in cascade, etc.
Triggered by a horizontal synchronization signal, three horizontal drive pulses r, g, and b of equal pulse width are generated within one horizontal period. here.

- By way of example, each pulse width is exposed to approximately 17μ,
Three pulses r during the effective horizontal scanning period of 60μ
+ g + b is generated. These horizontal drive pulses r, g, and b are applied to the horizontal deflection drive circuit 29. This horizontal deflection drive circuit 29 is switched by the horizontal drive pulses r1g and b.
A pair of step-varying horizontal deflection signals 1 and h' are generated. Both horizontal deflection signals h and h' have a center voltage of v7, and h increases sequentially.

h' change in opposite directions so as to decrease sequentially. These horizontal deflection signals h 1 and h' are applied to electrodes 18 and 18' of the horizontal deflection electrode 7, respectively.

As a result, each horizontally segmented electron beam sequentially hits the phosphors of screens 90R, G, and B during each horizontal period.
It is horizontally deflected so that 7μ is irradiated. however,
In the display element of FIG. 1, one conductor 18 or 18' in the horizontal deflection electrode.

are used to deflect the electron beams of two adjacent sections, and are designed to produce deflection effects in mutually opposite directions on the adjacent electron beams, so 3.
Of the 20 sections of electron beams, the odd-numbered sections are R-
If the beams are deflected in the order of G-B, the even-numbered sections are deflected in the reverse order of B-G-R16, and so on, so that every other section is deflected in the opposite direction.

Thus, in each line raster, the horizontal 3
The electron beams are R and G for each of the 20 sections.

Each phosphor 2o of B is sequentially irradiated with light.

Therefore, for each horizontal section of each line, the R and G electron beams are
, B, a color television image can be displayed on the screen 9.

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

First, the composite video signal applied to the television signal input terminal 23 is applied to the color demodulation circuit 30.

Here, the R-Y and B-Y color difference signals are demodulated and zeroed.

G-Y color difference signals are matrix-synthesized, and further.

These are combined with the luminance signal Y, and R, G, and H primary color signals (hereinafter referred to as R, G, and B video signals) are output. These R, (r, and B video signals are applied to 320 sample and hold circuit sets 311L to 31n. Each sample and hold circuit set 311L JP-A-58-10697
4 (5) to 31n each have three sample and hold circuits for R, G, and B. The sample and hold outputs of these sample and hold circuit sets 313 to 31n are applied to holding memory sets 32a to 32n, respectively.

On the other hand, the sampling reference clock oscillator 33 is a PI,
It is composed of an L (phase locked loop) circuit and the like, and in this embodiment, it generates reference clocks for approximately 6.4 clocks. The reference clock is controlled to always have a constant phase with respect to the horizontal synchronizing signal H. This reference clock is applied to the sampling pulse generation circuit 34, where it is delayed by one clock period by a shift register.

As a result, 320 sampling pulses a-n are generated during the effective horizontal scanning period (approximately 60μ) out of the horizontal period (ea, 6μ5eC), and then one transfer pulse is generated. Ru. This sampling pulse a-n corresponds to each picture element when one line of the video to be displayed is divided horizontally into 320 picture elements, and its position is always constant at 7% relative to the horizontal synchronizing signal H. controlled so that

These 320 sampling pulses a-n are connected to the 320 sample-and-hold circuit sets $1a to 3In, respectively.
is added to each sample-and-hold circuit set 3.
In 1a to 32n, R, G, and B video signals of each picture element when one line is divided into 320 picture elements are individually sampled and held. The sampled and held 320 sets of R, G, and B video signals are stored in the memory 320 after completing the sample and hold for one line.
~32H, they are transferred all at once by a transfer pulse t, and are held here for the next one horizontal scanning period.

One line of R, G stored in the memories 32a to 32n
, B video signals each have 320 switching circuits 3.
51L to 35n. Switching circuit 36&
~35n are each R, (,.

Each switching circuit 35f has individual input terminals of B and a common output terminal that sequentially switches and outputs them.
The output of L~36n is used as a control signal to modulate the electron beam B to the control electrode 6032 of the display element.
It is individually applied to each of the 0 conductive plates 16a to 15n. The switching circuits 315a to 35n are simultaneously controlled by switching pulses applied from the switching pulse generating circuit 36. The switching pulse generation circuit 36 receives pulses r and g from the horizontal drive pulse generation circuit 28 described above.

The effective horizontal scanning period of about 60μ of each horizontal period is divided into three, and the switching circuits 351L to 36n are switched for about 17μ each, and each video signal of R1 (1, , B is time-divided). control electrode 1.
Switching signals r, g, and b are generated to be supplied to 51L to 15n. However, switching circuits 362L to 35H
In, the odd-numbered switching circuits 351L, 3
50... are switched in the order of RG-, B,
Even-numbered switching circuits 35b, 35d...
-36n is configured to be switched in the reverse order of B-+G-+R.

What should be noted here is that the switching circuits 351L~
19 supply switching of the R, G, and B video signals at 35n and the horizontal deflection of the electron beam irradiation switching to the R, G, and B phosphors by the horizontal deflection drive circuit 29 are completely performed in both timing and order. It is synchronously controlled to match. As a result, when the electron beam is irradiating the R phosphor, the irradiation amount of the electron beam is controlled by the R video signal, and the G and H are similarly controlled, so that the R, G, and B of each picture element are controlled in the same way. The emission of each phosphor is controlled by the R, G, and B video signals of that picture element, and each picture element is displayed by emitting light according to the input video signal. Such control is performed simultaneously for 320 picture elements for one line to display one line of video, and then sequentially performed for 240 minutes from the upper line to display one video on screen 9. That will happen.

and one or more such operations are performed on one or more of the input television signals.
The result is repeated for each field.

A moving television image is displayed on the screen 9 in the same way as a normal television receiver.

JP-A-58-106974 (6) As described above, television images are displayed on this display device.

Note that the terms "horizontal direction" and "vertical direction" used in the above explanations refer to the direction in which line units are displayed when displaying an image is the horizontal direction, and the direction in which the lines are stacked is the vertical direction. Although it is used in this sense, it is not directly related to the vertical and horizontal directions on the actual screen.

As described above, television images are projected on this display device, but due to assembly errors of each electrode during manufacturing of display elements, the vertical deflection is not uniform, and as a result, the screen The spacing between lines on the screen has become uneven, and the edges of each line have shifted vertically.

The scanning lines of each line may overlap or there may be gaps.

Therefore, one object of the present invention is to provide a device that can correctly display each raster line on a screen at a predetermined position at a predetermined constant interval when using the above-mentioned image display element. The purpose is to

First, a conventional vertical deflection drive circuit will be explained. Fourth
The figure shows the basic configuration of the vertical deflection drive circuit 27. The ring counter 37 is reset at the leading edge of each of the vertical drive pulses [A] to [Y] from the vertical drive pulse generation circuit 26, and then counts the horizontal synchronization signal H, sequentially outputting one horizontal signal from the 16 output terminals. A switching pulse ˜π is generated every period.

- The variable resistor 38 is provided with 16 output terminals, from which 16 levels of output voltage for vertical deflection are taken out, and the analog switches 391L to 39π
is retrieved via. Each analog switch 39a to 39
π is sequentially switched to be conductive for one period at a time by switching pulses a to π, respectively, and an output of a stepped waveform is obtained which is divided into 16 stages between the lowest terminal and the highest terminal and whose level increases successively. The output voltage is extracted through a transistor 40 connected as an emitter follower, its amplitude is adjusted by a variable resistor 41, and further amplified by a class B amplifier circuit 46 composed of transistors 42, 43, and 44. A vertical deflection signal V is produced from the output terminal 46. On the other hand, the vertical deflection signal V' is also created by a completely similar circuit, but the only difference from the above case is that the analog switches 392L' to 39π' are switched in the reverse order by the switching pulses a to π; A step-like output V' whose level gradually decreases is created by this, and is output from the output terminal 4e/.

The vertical deflection signals V and V' thus created are applied to the conductive plates 13 and 13' of the vertical deflection electrode 4, so that the electron beam is deflected in 16 steps within each section in the vertical direction. A raster of 16 lines is drawn with one electron beam.

However, in one display element, the vertical deflection electrode 4 is
Conductive plate 13 due to errors in mounting dimensions of each electrode plate.
If there are variations in the distance between and 13' and the position in the front-rear direction, each raster line will not be drawn at the specified position on the screen 9, but will shift upward or downward. Although it is not possible to correctly display each line at a predetermined position at a predetermined constant interval, it is difficult to correct or set the deflection position correctly using the conventional circuit as described above.

Therefore, a vertical deflection drive circuit according to an embodiment of the present invention that can solve the above problems will be described with reference to FIG. In FIG. 6, reference numeral 50 denotes a digital memory 6 that stores the voltage of the vertical deflection signal as a digital signal for each of 240 lines in the vertical direction.
1 is an address counter that controls the read address during display.

62 is a D that converts the digital signal read out from the digital memory 60 into an analog signal to produce a vertical deflection signal.
53 is a data setting circuit for inputting arbitrary data when setting and writing the vertical deflection signal of each line in the digital memory 60; 64 is a data setting circuit for inputting arbitrary data when setting and writing the vertical deflection signal of each line in the digital memory 60; The address setting circuit to be set, switch 66, switches the digital memory 60 between the write state (G) and the read state (6). connects the address signal from the address setting circuit 64 to the gaintal memory 60 in the write state.

This is a switch circuit for connecting the address signal from the address counter 61 to the digital memory 60 in the read state.

With this configuration, deflection data for correctly vertically deflecting each of the 240 lines is stored in advance in the digital memory 50 for each line using the digital memory 60, and the deflection data for each line is stored in advance in the digital memory 50. Digital data is read from the digital memory 5o for each line, and the D-person converter 52 converts the digital signal into an analog signal to obtain a step-like vertical deflection waveform.

In this way, a digital signal is written in the digital memory 50 for each line in advance so that an arbitrary predetermined deflection voltage can be obtained for each line. However, the deflection position can be set correctly for each line to match it.

6 To write the digital signal of the deflection voltage for each line to the digital memo IJ-50, first turn the switch 66 to W.
The switch circuit 66 is switched to the address setting circuit 64 side to connect the digital memory 60 to the writing state. Then, the address setting circuit 5 sets the address corresponding to the line for which the deflection position is to be set.
4 to select the address of the digital memory 60.

Deflection data for the line at that time is set by the data setting circuit 53 and input into the digital memory 60. At this time, it is possible to manually input correct deflection data by adjusting in advance an address corresponding to the deflection position of each line to correctly display that line.

On the other hand, at the time of deflection for actual image display, the switch 66
is set to the R side to put the digital memory 60 in a read state, and the switch circuit 66f is switched to the near address counter 61 side for connection. The address counter 61 is reset by the vertical synchronizing signal V, and then counts the horizontal synchronizing signal 6H. That is, address data corresponding to each line is output from the address counter 61 and addresses the digital memory 60. Digital memory 6
Since 0 is in the read state, a digital signal is output from the line corresponding to the address data from the address counter 61, and is converted into an analog signal by the D-person converter 62.

A deflection signal is obtained.

In this manner, a desired deflection waveform can be obtained by storing the digital signal data of the vertical deflection signal for each line in the digital memory 50 and reading it out for each line during one display.

Each raster line can be correctly displayed at a predetermined position on the screen 9 at a predetermined constant interval.

The output of the D-me converter 62 is preferably outputted as a deflection output waveform V through a class B amplifier circuit 46 composed of transistors 42 to 44 in addition to the emitter follower transistor 40 of the circuit shown in FIG. On the other hand, the deflection output waveform V' can also be obtained by the same circuit as shown in FIG. 627.

In this embodiment, a memo IJ (RAM) that can be written and read is used as the digital memory 50, but a read-only memory (ΣP-ROM) can also have the same effect by being adjusted in advance at the factory and stored in the settings. can be obtained.

Thus, this device allows accurate position adjustment of each of the 240 lines with a simple circuit configuration, and is also effective in terms of small number of parts and small size.

As described above, according to the present invention, the screen on the screen is vertically divided into a plurality of sections, an electron beam is generated in each section, and each electron beam is deflected in the vertical direction for each section. In a device that displays a plurality of lines and displays nine television images as a whole, a vertical deflection signal for correctly displaying each line in a predetermined position is stored in advance in a digital memory as a digital signal. When displayed, the digital memo IJ +
Read out the data, convert it to D-m, and convert it to vertical 1st bar B of the stepped waveform.
? 358-106974 (8) Since it is added to the image display element as a deflection signal, even if an error occurs in the display position of each line due to assembly errors of various parts of the display element, the error can be corrected in advance. By adjusting and setting digital signals that can display each line in the correct position and storing them in digital memory,
With an extremely simple circuit configuration, it is possible to obtain an excellent display device that can be vertically deflected so that each line can be displayed at a predetermined correct position.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the basic configuration of an example image display element used in the image display device of the present invention. Fig. 2 is an enlarged view of the screen, Fig. 3 is a block diagram showing the basic configuration of the drive circuit of the device, Fig. 4 is a specific circuit diagram of the vertical deflection drive circuit, and Fig. 6 is an embodiment of the present invention. FIG. 2 is a block diagram of main parts of a vertical deflection drive circuit used in an example image display device. 2... Line cathode as an electron beam source, 3.3'
...Vertical focusing electrode, 4...Vertical deflection electrode, 6... Electron 9 Beam flow control electrode, 6... Horizontal focusing electrode, 7
...Horizontal deflection electrode, 8...Electron beam acceleration electrode, 9...Screen, 20...
・Fluorescent material, 23... Input terminal, 24...
・Synchronization separation circuit, 26... Vertical drive pulse generation circuit, 26... Line cathode drive circuit, 27...
...Vertical deflection drive circuit, 28...Horizontal drive pulse generation circuit, 29...Horizontal deflection drive circuit, 30
...Color demodulation circuit, 311-31n...
Sample and hold circuit group, 321L to 32n...
・Memory group, 34...Sampling pulse generation circuit, 351L to 36n...Switching circuit %36...Switching pulse generation circuit, 5
0...Digital memory. 61...Address counter, 62...
・D-me converter, 63... Data setting path, 64... Address setting circuit, 66...
...Switch, 66...Switch circuit. Name of agent: Patent attorney Toshio Nakao
Figure 1 Penalty Serr = 9T- Figure 3〉 2 Ward ■)

Claims (1)

[Claims] A screen surface is vertically divided into a plurality of sections, an electron beam is generated in each section, and each electron beam is deflected in the vertical direction for each section, so that a plurality of electron beams are generated on the screen. A display element for displaying lines is provided, and a stepwise waveform vertical deflection signal is applied to vertical deflection means for vertically deflecting the electron beam for each section to create the vertical deflection signal. As a means to do this, we use a counter that counts horizontal synchronization signals. Addressing means supplies the output of the counter as an address signal to a digital memory that stores the value of the vertical deflection signal for each line as a digital signal, and reads out the digital signal of the line corresponding to the address from the digital memory. and a D-me converter for converting the read digital signal into an analog signal to produce a stepwise waveform vertical deflection signal, and the vertical deflection position for each line is set using the digital signal. An image display device characterized by: