JPS6238085A - image display device - Google Patents

Abstract

PURPOSE:To prevent the necessity of the memory, to do without the special deflection and further to eliminate the necessity of the complicated control pulse by compensating the vertical landing position of the electronic beam for the real time of the video display time. CONSTITUTION:When the electronic beam is irradiated on triangular holes 61 and 62 or resistors 71 and 72, the electric current output in accordance with the position where the electronic beam is irradiated can be obtained from the sensor arranged for one vertical cathode division. Namely, the more the electronic beam is irradiated in the upper direction at the resistors 71 and 72, the more a detecting electric current I1 is increased, and I2 is decreased. In the same manner, the electric current I2 to flow into the triangular hole 62 is increased, and the electric current I2 to flow into the triangular hole 62 is decreased. Next, since the sensitivity is raised and the noise is decreased, I1-I2 calculation is executed, and further, to eliminate the detecting error due to the emission quantity change, the result of the above-mentioned difference is divided by (I1+I2). The suitable function f(x) is multiplied to the signal, and the quantity of the off-set, the gain, etc., is adjusted.

Description

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

Conventional technology Traditionally, cathode ray tubes have been mainly used as display elements for displaying color television images, but conventional cathode ray tubes have a very long depth compared to the screen size, making it difficult to use in thin television receivers. It was impossible to create. In addition, although EL display elements, plasma display devices, liquid crystal display elements, etc. have recently been developed as flat display elements, all of them are insufficient in terms of performance such as brightness, contrast, and color display, and have not been put into practical use. It has not yet been reached.

Therefore, we aimed to achieve a flat display device using electron beams, and when the screen on the screen is vertically divided into multiple sections, an electron beam is generated for each section. Some devices display multiple lines by vertically deflecting each electron beam to display a television image as a whole.

First, a basic configuration of the image display element used here will be explained with reference to FIG. 6. This display element consists of, in order from the back to the front, a back electrode (1), a line cathode (2) as a beam source, vertical focusing electrodes (3) (3'), a vertical deflection electrode (4), and a beam flow control Electrode (5), horizontal focusing electrode (
6) It consists of a horizontal deflection electrode (7), a beam acceleration electrode (8), and a screen (9), which are housed inside a flat glass bulb (not shown) that is evacuated. ing. Line cathode as beam source (2)
is stretched in the horizontal direction so as to generate an electron beam distributed linearly in the horizontal direction, and a plurality of such linear cathodes (2) are arranged vertically at appropriate intervals ((2a) to (2)
d) only four are shown). In this example, it is assumed that 15 are provided. them (2a)
~(2o). These line cathodes (2) are for example 1
An oxide cathode material for thermionic emission is coated on the surface of a tungsten wire having a diameter of 0 to 2 μΦ. and,
These line cathodes (2a) to (2o) are heated so as to generate a thermionic electron beam by passing an electric current through them, and as described later, electrons are emitted from the IIX cathode (2a) for a certain period of time. controlled to emit a beam. The back electrode (1) suppresses the generation of electron beams from other line cathodes other than the line cathode that is controlled to emit electron beams for a certain period of time, and directs the generated electron beams only in the forward direction. It has the effect of pushing out. This back electrode (1
) may be formed by a coating of conductive material applied to the inner surface of the rear wall of the glass bulb. Moreover, a planar electron beam emitting cathode may be used instead of the back electrode (1) and the linear cathode (2).

The vertical focusing electrode (3) is a conductive plate (11) having a horizontally long slit (10) facing each of the line cathodes (2a) to (2o), and collects the electron beam emitted from the line cathode (2). Take out through the slit (1o),
and vertically focused. 1 horizontal line (3
60 pixels worth of electron beams are taken out at the same time. In the diagram,
Of these, only one section in the horizontal direction is shown.

The slit (1o) may be provided with crosspieces at appropriate intervals in the middle, or may be a row of through holes provided in large numbers at small intervals in the horizontal direction (the intervals are such that they almost touch each other). It may be configured substantially as a slit. The vertical focusing electrode (3') is also similar.

A plurality of vertical deflection electrodes (4) are arranged horizontally at intermediate positions between the slits (1o),
Conductors (
13) (13') is provided. Then, a vertical deflection voltage is applied between the opposing conductors (13) (13') to deflect the electron beam in the vertical direction. In this example, a pair of conductors (13) (1
3') deflects the electron beam from one line cathode (2) vertically to positions corresponding to 16 lines.

The 16 vertical deflection electrodes (4) constitute 15 conductor pairs corresponding to each of the 15 line cathodes (2), so that 240 horizontal lines are drawn on the screen (9). Deflect the electron beam to

Next, the control electrodes (5) are composed of conductive plates (15) each having a long slit (14) in the vertical direction, and a plurality of control electrodes (5) are arranged in parallel in the horizontal direction at a predetermined interval.

This example 'S has 180 conductive plates for control electrodes (15-1
) to (15-n) are provided. (Only nine electrodes are shown in the figure.) Each of these control electrodes (5) divides the electron beam into two picture elements in the horizontal direction and extracts it, and displays the amount of electron beam passing through each picture element. control according to the video signal. Therefore, if 18080 conductive plates (15-1) to (15-n) for control electrodes (5) are installed, one horizontal
360 picture elements can be displayed per line. In addition, in order to display images in color, each picture element is R, G, B
Each control electrode (5)
has two picture elements of R and G.

Each video signal of B is added sequentially. In addition, 180 pairs of video signals for one line (2 pixels per pair) are simultaneously applied to each of the 180 conductive plates (tS-t) to (15-n) for control electrodes (5). One line of video is displayed at one time.

The horizontal focusing electrode (6) is connected to the slit (14) of the control electrode (5).
) is composed of a conductive plate (17) having a plurality of vertically long slits (16) facing each other, and the electron beam for each pixel divided horizontally is transmitted horizontally. Focus into a narrow beam of electrons.

The horizontal deflection electrode (7) is composed of a plurality of conductive plates (18) (18') arranged vertically on both sides of the slit (16), and each electrode (18) ( 18') is applied with six levels of horizontal deflection voltage to deflect the electron beam of each picture element in the horizontal direction, so that two sets of R and G are displayed on the screen (9).

Each phosphor of B is sequentially irradiated to emit light. In this embodiment, the deflection range is two picture elements wide for each electron beam.

The accelerating electrode (8) is composed of a plurality of conductive plates (]9) installed horizontally in the same position as the vertical deflection electrode (4), and is designed to direct the electron beam to the screen (9) with sufficient energy. Accelerate so that it collides with.

The screen (9) is constructed by applying a phosphor (20) that emits light when irradiated with an electron beam to the back surface of a glass plate (21), and adding a metal back layer (not shown). The phosphor (20) has two phosphors of three colors R2O and B for one slit (14) of the control electrode (5), that is, for each one electron beam divided in the horizontal direction. They are provided in pairs and are applied in vertical stripes. The broken lines drawn on the screen (9) in FIG. ) shows the horizontal divisions displayed corresponding to each of them. As shown in the enlarged view in Figure 7, one section partitioned by these two has 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 30 minutes. The size of one section is, for example, 1 m in the horizontal direction and 10 m in the vertical direction.
It is IIIl.

Note that in FIG. 6, the length in the horizontal direction is drawn much thicker than in the vertical direction for clarity.

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

Next, the basic configuration and waveforms of each part of a drive circuit for displaying television images on this display element will be explained with reference to FIG. First, a driving portion for irradiating the screen (9) with an electron beam to emit raster light will be described.

The power supply circuit (22) is a circuit for applying a predetermined bias voltage (operating voltage) to each electrode of the display element.
-v1 for 1), V for vertical focusing electrode (3) (3'), v, y, v6 for horizontal focusing electrode (6), ■8 for accelerating electrode (8), screen (9) A DC voltage of V is applied to.

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

The vertical deflection drive circuit (40) includes a vertical deflection counter (2
5), a memory for storing vertical deflection signals (27), and a digital-to-analog converter (39) (hereinafter referred to as a DA converter). Vertical deflection drive circuit (40
) is the vertical synchronizing signal V shown in FIG.
and horizontal synchronization signal H. 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) counts the effective scanning period (in this case, a period of 240H) excluding the vertical blanking period of the vertical period, and this count output is supplied to the address of the memory (27). be done. The memory (27) outputs vertical deflection signal data (here, 8 bits) corresponding to each address, and the D-A converter (39) outputs the data of the 9th deflection signal.
It is converted into vertical deflection signals of υ and υ'' shown in the figure (Fig. 8 (b) D). In this circuit, there is a memory address for storing vertical deflection signals corresponding to each line of 240H, and 16H of vertical deflection signals are stored. By storing regular data in the memory, 16 levels of vertical deflection signals 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 a line cathode drive pulse a'=o. FIG. 10(a) shows the vertical synchronizing signal V, the horizontal synchronizing signal H, and the vertical deflection counter (2).
5) shows the relationship between the lower 5 bits. FIG. 10(b) shows a line cathode drive pulse a' every 16H using these signals.
We will show you how to make ~O゛. In FIG. 10, 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 with an R-S flip-flop using the vertical synchronization signal ■ and the output (LSB+4) of the vertical deflection counter (25), and the line cathode drive pulses b' to Q ' is shifted and using the l raster, the line cathode driving pulse a' is applied to the vertical deflection counter (25).
It can be obtained by transferring the inverted version of the output (LSB+3) as a tarok. This drive pulse a
′~Ω′ are inverted and made low potential only during each pulse period,
During other periods, the pulses are converted into linear cathode drive pulses a to 0 with a high potential of about 20 volts (FIG. 8(b)E), and are applied to each of the linear cathodes (2a) to (2o).

Each line cathode (2a) to (2o) is heated by passing a current during the high potential period of the drive pulse a-o, and is heated so that it can emit electrons during the low potential period of the drive pulse a''o. state is maintained.This allows 15 line cathodes (2
From a) to (2o), a low potential drive pulse a is applied to each of a) to (2o).
Electrons are emitted only during the 16H period when -o is added.

During periods when a high potential is applied, the line cathode ( Since the high potential applied to 2a) to (2o) is positive, no electrons are emitted from the linear cathodes (2a) to (20). Thus, at the line cathode (2), during the effective vertical scanning period, the upper line cathode (2a
) toward the line cathode (20) below, electrons are sequentially emitted every 16H period. The emitted electrons are transferred to the back electrode (1)
The electron beam is pushed forward by the electron beam, passes through the opposing slit (10) of the vertical focusing electrode (3), and is focused in the vertical direction to form a flat electron beam.

Next, the line cathode drive pulse a-o and the vertical deflection signals υ, υ′
The relationship will be explained using FIG. 11. 11th
Figure (a) is a waveform diagram of a line cathode drive pulse, (b) is a waveform diagram of a vertical deflection signal, and (c) is a waveform diagram of a horizontal deflection signal. Vertical deflection signal υ in FIG. 11(b).

υ' is 1 of each line cathode pulse a''o in Fig. 11(a).
6I (changes by IH during the period and changes in 16 steps.

Both vertical deflection signals υ and υ' have a center voltage of v4, and υ increases sequentially and υ' decreases sequentially.
They are designed to change in opposite directions. These vertical deflection signals υ and υ' are respectively applied to the electrodes (13) and (13') of the vertical deflection electrode (4), resulting in the electron beams generated from the respective line cathodes (2a) to (20). is vertically deflected in 16 steps, and as mentioned earlier, on the screen (9), one electron beam is deflected so that a raster of 16 lines is drawn sequentially one line at a time from the top.

As a result of the above, electron beams are emitted for 16H periods in order from the one above the 15 line cathodes (2a) to (20).

Each electron beam is deflected one line at a time from top to bottom within 15 sections in the vertical direction, so that on the screen (9), from the first line at the top to the second line at the bottom.
The electron beam is vertically deflected one line at a time until the 40th line, and a total of 240 lines are drawn.

The vertically deflected electron beam is sent to the control electrode (5).
It is divided into 180 sections in the horizontal direction by a horizontal focusing electrode (6) and taken out. In Figure 7, one of them
The classification is shown. The amount of this electron beam passing through each section is controlled by a control electrode (5), and is focused horizontally by a horizontal focusing electrode (6) into a single narrow electron beam. The light is deflected in six steps in the direction and sequentially irradiates each of the R2O and B phosphors (20) for two picture elements on the screen (9). FIG. 7 shows the vertical and horizontal divisions. The phosphors corresponding to each of (15-1) to (15-n) of the control electrode (5) are R, G, and B for two picture elements, but for convenience of explanation, one picture element is R□, G1. B type and the other side is R2, G2.
Let's call it B2.

Next, the horizontal deflection drive circuit (41) is composed of a horizontal deflection counter (28) (o bit), a memory (29) that stores horizontal deflection signals, 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. 12, and uses a pulse 6H having a repetition frequency six times that of the horizontal synchronizing signal H. The horizontal deflection counter (28) is reset by the vertical synchronization signal ■ and receives the horizontal six times the pulse 6H.
count. This horizontal deflection counter (28) is
6 times during H, 240H during 1v 6/H = 1
It counts 440 times, and this count output is stored in the memory (29
) is supplied to the address.

The memory (29) outputs horizontal deflection signal data (in this case 8 bits) according to the address, and the D-A converter (38) converts it as shown in Figure 12 (Figure 8 (b) c). , h'. This circuit has memory addresses for storing horizontal deflection signals corresponding to each of 6 x 240 lines, and by storing 6 pieces of regular data for each line in the memory, 6 A step-wave horizontal deflection signal can be obtained.

As shown in Fig. 12, 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 V, where h decreases sequentially and h' increases sequentially. As they progress, they change in opposite directions. These horizontal deflection signals, h' are the electrodes (
18) and (18'). As a result, each horizontally segmented electron beam is applied to the R, G of the screen (9) during each horizontal period.

B, R, G, B (R1, G,, B1.R2, G2.B
The light is horizontally deflected so that the phosphor of 2) is sequentially irradiated for H/6 periods. Thus, in the raster of each line, the electron beam is applied to each of the 180 sections in the horizontal direction.
Gx+ Blp R2? (Each phosphor of 3z + Bz (
20) are sequentially irradiated.

Therefore, the electron beams are set to R, , G for each horizontal section of each line.
1. A color television image can be displayed on the screen (9) by modulating the video signals of B□, R2, G, .

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), where the R-Y and B-Y color difference signals are demodulated and the G-Y color difference signals are demodulated. The color difference signals are matrix-synthesized, and further, they are combined with the luminance signal Y to form each primary color signal R2O, B (hereinafter R,
G, B video signals) are output. Those R,G
, B. Each video signal is processed by 180 sample and hold circuits (3
1-1) to (31-n). Each sample hold circuit (31'-1) to (31-n) is R0
It has six sample and hold circuits: 1, G1, B, R2, G2, and B2. Those sample and hold outputs are stored in memory (32-], ) to (
32-n).

On the other hand, the reference clock oscillator (33) is composed of a PLL (phase-locked loop) circuit, etc., and in this example, the reference clock 6fsc is six times the color subcarrier fsc.
and a double reference clock 2fsc is generated. The reference clock is controlled to always have a constant phase with respect to the horizontal synchronizing signal H.

The reference clock 2fsc is a deflection pulse generation circuit (42)
signals 6H and H/6, which are six times the horizontal synchronization signal H.
Signal switching pulse r1+ gt+ bt, rz+g
A pulse of 2y))a (FIG. 8(b) B) is obtained. On the other hand, the reference clock 6fsc is applied to the sampling pulse generation circuit (34), where it is delayed by one clock period by a shift register, etc., so that the effective horizontal scanning period (approximately 5
1080 sampling pulses R during 0μ5ec)
,4,G,1. B1□, R, 2, G engineering 2. B□2.
R2,,G,,.

B,,,R22,G22. B, □□-Rn,, G
nl, )3n,,Rn,.

On, , Bn- (Fig. 8(b) A) are generated sequentially,
After that, one transfer pulse t is generated. These sampling pulses R, ~Bn2 correspond to each picture element when one line of the video to be displayed is divided into 360 picture elements in the horizontal direction, and their positions are always constant with respect to the horizontal synchronizing signal H. controlled so that

These 1080 sampling pulses R1□~Bn2 each form 180 sets of sample hold circuits (:H-1)
~(31-n), and as a result, each sample hold circuit (31-1) to (31-n) has 1, and when the line is divided into 180 pieces, 2 picture elements each are added. Each video signal of R, Gx, Bz+Rz+Gel, BZ is individually sampled and held.

The sample held 180 pairs of R□, G□?
B 1 t Rz tG,, B2 video signal is stored in 180 sets of memory (3
2-1) to (32-n) are transferred all at once by transfer Hals t, where they are held for the next horizontal period. This retained R-work.

G,, B1. R2, G2. The B2 signal is applied to switching circuits (35-1) to (35-n). The switching circuits (35-1) to (35-n) each have Rt
lG□, B,.

R,,G2. It is composed of a tri-state or analog gate having individual input terminals of B2 and a common output terminal that sequentially switches and outputs them.

The output of each switching circuit (35-1) to (35-n) is 180 sets of pulse width modulation (PWM) circuit (37-1)
~(37-n), where the sample-held R1. G1. Bo, R, , G, , B The reference pulse signal is pulse width modulated according to the magnitude of the video signal and output. The repetition period of the reference pulse signal is the above signal switching pulse r 2g, b□, r2゜gz
, I) It is desirable that the pulse width is sufficiently smaller than the pulse width of z, 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 sent to the 180 conductive plates (15-1) of the control electrodes (5,) of the display element as control signals for modulating the electron beam.
~(15-n) are individually added to each. Each switching circuit (35-1) to (35-n) receives a switching pulse r1p gzr blt rxt gzr bz applied from a switching pulse generating circuit (36).
Switching is controlled at the same time. The switching pulse generation circuit (36) is the aforementioned deflection pulse generation circuit (42).
Signal switching pulse from rxt gzr bxr rz
Each horizontal period is divided into 6 and a switching circuit (35-1
) to (35-n), R1, G1 . B□, R
2, G2. A switching signal rt+ gzr b1*rz+ is output so as to time-divide and sequentially output each video signal of B, and supply it to the pulse width modulation circuits (37-1) to (37-n).
Generate gzr bz.

What should be noted here is that the switching circuit (35-
R1, G1 in 1) to (35-n). B1.
R.

G2. B2 video signal supply switching, electron beam R processing using the horizontal deflection drive circuit (41), G1. The horizontal deflection for switching the irradiation to the phosphor of B, R2°G, , B is synchronously controlled so that they completely match both in timing and order. As a result, when the electron beam is irradiating the R2 phosphor, the irradiation amount of the electron beam is controlled by the R2 video signal, and G□, B
1. R,,G2. B is controlled in the same way, and the light emission of each phosphor of each picture element is controlled in the same manner as R□, G□, B1°R2,G, , B, and the light emission of each phosphor is adjusted to R1, G1°B1 . R,,G2. B2
Each picture element is controlled by the input video signal, and each picture element is displayed by emitting light according to the input video signal. There are 180 sets of such controls for one line (2 pixels each)
This is done simultaneously to display an image of 360 picture elements in one line, and then sequentially from the upper line to 240H lines, so that one image is displayed on the screen (9).

Then, the above-mentioned initial operation is performed for 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 imager.

Further, the Landink position of the electron beam is detected by a resistor or a triangular hole on the focusing electrode. This detection method involves deflecting light so that it emits light at appropriate time intervals (for example, 1 field) at the upper and lower ends of one segment Kn in the vertical direction during the vertical retrace period, and detecting the land ink position in each case using a current value. Then, by converting this current value into a voltage value and performing arithmetic processing, the amount of change in amplitude and offset is obtained, and this is used to change the deflection waveform and return the land ink position to the normal position (Patent application No. 59 -211811 and Japanese Patent Application No. 59-265713).

Problems to be Solved by the Invention In the conventional vertical Landink position compensation system over time, since the amplitude and offset change amount are detected during the vertical blanking period, detection takes time (for example, one frame), and the timing of detection and feedback is difficult. A large time difference occurs, which causes the following problems.

(1) Memory is required to store detected values.

(2) Deflection data is required to obtain a special deflection.

(3) Requires complex timing pulses to operate the system.

The present invention solves the above problems, and aims to provide an image display device that provides feedback in real time.

Means for Solving the Problems In order to solve the above problems, the present invention provides a plurality of line cathode electron beam generation sources, a screen having a phosphor that emits light when irradiated with the above electron beams, and the above-mentioned A focusing electrode that focuses the electron beam generated by the electron beam generation source, an electrostatic deflection electrode that deflects the electron beam on the way to the screen, and an electrostatic deflection electrode that controls the amount of the electron beam irradiated onto the screen. It is equipped with a display element that has a control electrode that controls the emission intensity and a sensor that detects the vertical land ink (deflection) position, and compares the detection signal obtained by calculating the sensor output and converting it into voltage with the signal obtained by calculating the vertical deflection signal. In this embodiment, a comparator is provided, and a means is provided for superimposing a signal corresponding to the Landink position shift obtained from the comparator on the analog vertical deflection signal at that time.

Operation With this configuration, during the image display period, the signal waveform detected by, for example, a resistor or triangular hole provided in the focusing electrode is calculated, and an appropriate function is applied to adjust the amount of offset, gain, etc.
This is the vertical deflection signal υ.

A signal corresponding to the Landink position shift is obtained by comparing it with the signal (υ − υ′)/2 obtained by calculating from υ′, and this signal is fed back to the vertical deflection signals υ and υ′ in real time to perform the shift. and perform stability compensation for the vertical land ink position. Since feedback is applied in real time in this way, there is no need for memory, special deflection data, or complicated control pulses for operating the system. This will be explained with reference to the drawings. FIG. 1 shows a feedback system for compensating for deviations in the vertical land ink position of an electron beam of an image display device in an embodiment of the present invention. In Figure 1, (
27) is a memory for storing the signal from the vertical deflection counter (25) of the image display device, and (39) is a DA converter, which is the same as that shown in FIG. (51) is the vertical deflection signal output circuit, (52) is the vertical deflection signal D/A converter 39's D/A (c) (d) vertical output signal υ from (d), and (υ-υ ')/2, and (52) is the sensor detection current 11.
A divider that generates a signal of (D - L)/(I + 12) from I2, (54) is a function generator that multiplies the output of the divider (53) by an appropriate function f (x), (55
) is a comparator for comparing the outputs from the arithmetic unit (52) and the divider (53), and (56) (56)' is a D-A converter (39) according to the output from the comparator (55). ) D/A (c) This is a level shift circuit for controlling the outputs of (d), and each output is connected to the output circuit (5
1) is input to the output parts (c) and (d).

Figures 2 and 3 show an example of a Landek position detection sensor, and Figure 2 shows triangular holes (61) at both outer ends of the effective screen of the focusing electrode ((3)' in Figure 6) of the image display device.
(62) is provided, and FIG. 3 shows a state where resistors (71) and (72) are provided at both outer ends of the effective screen. In the case of the triangular holes (61) and (62), the shapes on both the left and right sides are formed to be opposite to each other, and each of the left and right sides has n pieces, and in the case of the resistors (61 and 62), the shapes on both the left and right sides are mutually opposite to each other. The arrangement is in a zigzag pattern, and there are a total of n pieces on the left and right sides.

Figure 4 shows the resistor (71) for detecting the land ink position.
(72), the triangular holes (61), (62), and the electron beam. 5
3), obtained through a function generator (54). (81)
and the output signal υ of the D-A converter (39) for the vertical deflection signal.
.

A signal (82) of (27-υ')/2 obtained as a result of calculation from υ' is shown.

The operation of the feedback system configured in this way will be described below. Triangular holes (61) (62) or resistors (71) (72) shown in Fig. 2 or 3
As shown in FIG. 4, when an electron beam is irradiated, a current output corresponding to the position irradiated with the electron beam can be obtained from the sensors arranged in each vertical single-force sword section. That is, in the resistors (71) and (72), the detection current I increases as the electron beam is irradiated onto the top.
Engineering 2 will decrease.

Similarly, the current □ flowing into the triangular hole (62) increases, and the current 1□ flowing into the triangular hole (62) decreases.

In FIG. 1, I, , I2 indicate the detected currents. Next, in order to increase the sensitivity and reduce noise, the calculation ``-I2'' is performed, and furthermore, in order to eliminate detection errors due to changes in the amount of emission, the result of the two-dimensional difference is divided by (I, +L). This signal is multiplied by an appropriate function f (x) to adjust amounts such as offset and gain. If the electron beam is in the correct position, the output signal (81) of the function generator (54)
) (Fig. 5(a)) and the output signal (8) of the arithmetic unit (52)
2) (Figure 5(b)) is consistent. If the n-grain lined position of the electron beam shown in FIG. 4 is shifted upward from the normal position, the comparator (55) outputs a positive signal corresponding to the amount of shift. The level shift circuits (56) (56)' receive this signal, and one of the level shift circuits (56) instantly works to lower the n-th stage DC voltage of the vertical deflection signal.
6) ′ works to increase the DC voltage v′. As a result, feedback is applied until the n-th stage electron beam returns to its normal position, making it possible to compensate the vertical ramp knob position of the electron beam in real time.

Effects of the Invention According to the present invention, it is possible to compensate for the vertical land ink position of the electron beam in real time during the image display period, and therefore it does not require a memory or special deflection as in the conventional case, and it also eliminates the need for complicated and complicated deflection. It does not require any control pulses.

[Brief explanation of the drawing]

Figure 2 is a block diagram of the main parts of an image display device according to an embodiment of the present invention, and Figures 2 and 3 are a triangular hole and a resistor as a sensor for detecting the position of the vertical land ink of the electron beam provided on the focusing electrode. 4 is a diagram explaining the relationship between the land ink position and the sensor, FIG. 5 is a diagram showing the detection signal waveform and deflection signal waveform, and FIG. 6 is an example used in the image display device of the present invention. 7 is an enlarged view of the phosphor screen of the image display element, FIG. 8 is a block diagram and waveform diagram showing the basic configuration of the drive circuit of the image display element, and FIG. 9 is an exploded perspective view of the image display element. FIG. 10 is a waveform diagram for explaining the operation of the vertical deflection drive circuit. FIG. 11 is a waveform diagram for explaining the operation of the line cathode drive circuit. FIG. 11 is a waveform diagram of each drive signal.
The figure is a waveform diagram for explaining the operation of the horizontal deflection drive circuit. (2) (2a) to (20)... line cathode, (3) (
3')... Vertical focusing electrode, (4)... Vertical deflection electrode, (5)... Beam flow control electrode, (7)... Horizontal deflection electrode, (9)... Screen, (20 )...phosphor, (27)... memory, (39)... D-A converter, (52)... arithmetic unit, (53)... divider, (
54)...Function generator, (55)...Comparator, (5
6) (56)'...Level shift circuit, (61) (6
2) Triangular hole, (71), (72)...Resistance body agent Yoshihiro Morimoto No. 1 No. 2 Gu Ichishin Naorin Mae I b No. 5 Do. Pus 1 m Me L So 3 q- --Tesicle analog f converter 5! -Output circuit 54-Function generation 3 5j-1 Bichu I4 56 no 6'-Level shift times "Each Figure 2 Figure 3 Effective a1 side Figure 4 Figure (1)) Cp Figure 9 Figure 1θ Figure cd) Kume 6, “

Claims (1)

[Claims] 1. a plurality of line cathode electron beam generation sources, a screen having a phosphor that emits light when irradiated with the electron beam, a focusing electrode that focuses the electron beam generated by the electron beam generation source; a display element having an electrostatic deflection electrode that deflects the electron beam up to the screen, a control electrode that controls the emission intensity by controlling the amount of the electron beam irradiated to the screen, and a vertical land ink. It is equipped with a sensor that detects the (deflection) position, and is equipped with a comparator that compares the detection signal obtained by calculating the sensor output and converting it into voltage with the signal obtained by calculating the vertical deflection signal. An image display device comprising means for superimposing a signal on a current analog vertical deflection signal.