JPH02116275A - Picture display device - Google Patents

Abstract

PURPOSE:To eliminate luminance dispersion due to the dispersion of responsibility between the ICs and to improve a picture quality by imposing a variable resistance between the Vcc terminal of a beam stream control electrode driving IC and a power source. CONSTITUTION:Beam stream control signals from a beam stream control signal generating circuit are inputted to ICs 61a to 61b, and impressed to respective conductive plates 15-1 to 15-n of a beam stream control electrode 5 after amplification. The ICs 61a to 61b consist of pulse amplifiers 62a to 62c, and by serially inserting semi-fixed resistances 63a to 63b between the Vcc terminals of the ICs 61a to 61b and the power source VB, since the potentials of the Vcc terminals of the ICs 61a to 61b fall by a sharp current increase at the time of the leading edge of the signal, a rise time becomes slower than that without the semi-fixed resistances 63a to 63b. Therefore, by changing the resistance values of the semi-fixed resistances 63a to 63b, responsibility can be regulated, and the dispersion of the responsibility between the ICs can be eliminated.

Description

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

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

Therefore, the present applicant proposed a new display device in Japanese Patent Application No. 56-20618 (Japanese Unexamined Patent Publication No. 57-135590) to achieve a flat display device using electron beams.

This method generates an electron beam for each section when the screen is vertically divided into multiple sections, and displays multiple lines by deflecting each electron beam vertically for each section. However, it displays a television image as a whole.

First, a basic configuration of the image display element used here will be explained with reference to FIG. 2. This display element consists of, in order from the back to the front, a back electrode 1, a line cathode 2 as a beam source, a vertical focusing electrode 3°3', a vertical deflection electrode 4, a beam flow control electrode 5, a horizontal focusing electrode 6, and a horizontal A deflection electrode 7, a beam acceleration electrode 8, and a screen 9 are arranged, and these are housed inside a flat glass bulb (not shown) which is evacuated. A line cathode 2 serving as a beam source is stretched horizontally so as to generate an electron beam linearly distributed in the horizontal direction.
are vertically spaced at appropriate intervals (2a to 2 in the figure).
(Only four wires shown in d) are provided. In this example, it is assumed that 15 are provided. 2a~20 of them
shall be.

These wire cathodes 2 are constructed by coating the surface of a tungsten wire with a diameter of 10 to 20 μΦ with an oxide cathode material for thermionic emission. And these line cathodes 2a-2
o is heated so as to generate a thermionic electron beam when a current is passed through it, and as described later, it is controlled to emit an electron beam sequentially for a certain period of time starting from the line cathode 2a.

The back electrode 1 suppresses generation of electron beams from line cathodes other than the line cathode controlled to emit electron beams for a certain period of time, and pushes out the generated electron beams only in the forward direction. act.

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 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 28 to 2o, and directs the electron beam emitted from the line cathode 2 into its slit h.
Extract through IO and focus vertically.

Electron beams for one horizontal line (360 pixels) are taken out at the same time. In the figure, only one section in the horizontal direction is shown. The slit 10 may be provided with crosspieces at appropriate intervals in the middle, or may be a row of through holes provided in small waves at small intervals in the horizontal direction (intervals that are almost 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 10, 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 commercial voltage is applied between the opposing conductors 13 and 13' to deflect the electron beam in the vertical direction.

In this example, the pair of conductors 13, 13' deflects the electron beam from one line cathode 2 to positions corresponding to 16 lines in the vertical direction. The 16 vertical deflection electrodes 4 constitute 15 conductor pairs corresponding to each of the 15 line cathodes 2, and the electron beam is deflected to draw 240 horizontal lines on the screen 9. .

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 example 1
Eighty control electrode conductive plates 15-1 to 15-n are provided (only nine 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 in accordance with a video signal for displaying each picture element. Therefore, if 18,080 conductive plates 15-1 to 15-n for control electrodes 5 are provided, 360 pixels can be displayed per horizontal line. In addition, in order to display images in color, each picture element is R
,G.

Display is performed using phosphors of three colors, B, and R, G, and B video signals for two picture elements are sequentially applied to each control electrode 5. In addition, 180 conductive plates 15-1 to 15 for control electrodes 5
180 sets of video signals for one line (two picture elements per set) are simultaneously applied to each of -n, and the video for one line is displayed at one time.

The horizontal focusing electrode 6 is composed of a conductive plate 17 having a plurality of vertically long 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.

The horizontal deflection electrodes 7 include a plurality of conductive plates 18.1 arranged vertically on both sides of the slit 16.
8', each electrode 18, 18'
A six-step horizontal deflection voltage is applied to horizontally deflect the electron beam for each pixel, and the two sets of R, G, and B phosphors are sequentially irradiated on the screen 9 to emit light. Let them do it. In this example, 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 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 phosphors 20 are provided with two pairs of phosphors of three colors R, G, 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. 2, 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. 3, one section partitioned by these two has R, G, and B phosphors 20 for two pixels in the horizontal direction, and 16 lines in the vertical direction. It has a width. 1
For example, the thickness of the two sections is lllll1 in the horizontal direction.
1. There are 9 cabinets in the vertical direction.

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

In addition, in this example, only one pair of R, G, and B phosphors 2° for two picture elements are provided for one control electrode 5, that is, for one electron beam. The control electrode 5 may be provided with R, G, B for 1 picture element or 3 or more picture elements.
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 described with reference to FIG. 4. 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. V3', horizontal focusing electrode 6 has V, acceleration electrode 8 has V and 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 V and a horizontal synchronization signal H. Vertical deflection drive circuit 4
0 includes a vertical deflection counter 25, a memory 27 for storing vertical deflection signals, and a digital-to-analog converter 39 (hereinafter referred to as D).
-A converter). As input pulses to the vertical deflection drive circuit 40, a vertical synchronizing signal (2) and a horizontal synchronizing signal H shown in FIG. 5 are used. The vertical deflection counter 25 (8 bits) is reset by the vertical synchronizing signal (2) and counts the horizontal synchronizing signal H. This vertical deflection counter 25 counts the effective scanning period (here, a period of 240H) excluding the vertical retrace period of the vertical period, and 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 D
-A converter 39 converts it into vertical deflection signals of υ and υ' shown in FIG. This circuit has memory addresses for storing vertical deflection signals corresponding to each line for 240H, and by storing regular data in the memory every 16H, it is possible to obtain 16 levels of vertical deflection signals. can.

On the other hand, the line cathode drive circuit 26 uses the vertical synchronization signal (■) and the output of the vertical deflection counter 25 to generate the line cathode drive pulse a''.
-Create o. FIG. 6(a) shows the relationship among the vertical synchronizing signal (2), the horizontal synchronizing signal H, and the lower five bits of the vertical deflection counter 25. FIG. 6(b) shows a method of creating line cathode drive pulses a' to 0' every 16H using these signals. In FIG. 6, LSB indicates the lowest bit, (LS
B+1) means the bit one higher than the LSB.

The first line cathode drive pulse a' is generated using the vertical synchronizing signal V and the output (LSB+4) of the vertical deflection counter 25.
The line cathode drive pulses b' to 0' can be generated using a flip-flop, etc., and the line cathode drive pulse a' is output from the vertical deflection counter 25 (L
It can be obtained by transferring the inverted version of S B + 3) as a clock. This drive pulse a'~
0' is inverted and converted into a line cathode driving pulse a''o which has a low potential only during each pulse period and a high potential of about 20 volts during other periods (Fig. 4(b)), and each line It is added to the cathodes 2a to 2o.

Each line cathode 2a to 2o is heated by a current flowing through it during the high potential of the drive pulse a''o.
The heated state is maintained so that electrons can be emitted during the low potential period -o. As a result, electrons are emitted from the 15 line cathodes 2a to 2o only during the 16H period in which the low-potential drive pulses a''-'o are applied to each one. During the period in which the high potential is applied.

Since the high potential applied to the linear cathodes 28 to 2o is more positive than the potential at the position of the linear cathode 2 determined by the bias voltage applied to the back electrode 1 and the vertical focusing electrode 3, Electrons are not emitted from the line cathodes 28-2o. Thus, in the line cathode 2, during the effective vertical scanning period, from the upper line cathode 2a to the lower line cathode 2
Electrons are sequentially emitted toward o every 16H 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, the line cathode drive pulse a ”o and the vertical deflection signal υ,
The relationship with υ' will be explained using FIG. 7th
FIG. 7(a) is a waveform diagram of a line cathode drive pulse, FIG. 7(b) is a waveform diagram of a vertical deflection signal, and FIG. 7(c) is a waveform diagram of a horizontal deflection signal. The vertical deflection signals υ and υ' shown in FIG. 7(b) change by IH in 16 steps during the 16H period of each line cathode pulse a-o shown in FIG. 7(a). The vertical deflection signals V and υ' both have a center voltage of v4, and are configured to change in opposite directions so that υ increases sequentially and υ' sequentially decreases. These vertical deflection signals υ and υ' are applied to electrodes 13 and 13' of the vertical deflection electrode 4, respectively.
As a result, the electron beams generated from each of the line cathodes 2a to 2o are vertically deflected in 16 steps, and as mentioned earlier, one electron beam forms a raster line of 16 lines on the screen 9. is deflected so as to draw 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 28 to 2o, and each electron beam is deflected by 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 at the top end to the 240th line at the bottom end, and a total of 240 raster lines are drawn.

The electron beam thus vertically deflected is horizontally divided into 180 sections by the control electrode 5 and the horizontal focusing electrode 6 and extracted. Figure 2 shows one of these categories. The amount of passage of this electron beam is controlled for each section by a control electrode 5, and is focused horizontally by a horizontal focusing electrode 6 into a single thin electron beam.
The light is deflected horizontally in six steps by the horizontal deflection means described below, and is sequentially irradiated onto the R, G, and B capacitive light bodies 20 corresponding to two picture elements on the screen 9. FIG. 3 shows the vertical and horizontal divisions. Control electrodes 5 15a-15, respectively
The phosphors corresponding to n are R and G for two picture elements.

For convenience of explanation, one pixel is R□, G1°B, and the other is R2, G2. Let's call it B2.

Next, the horizontal deflection drive circuit 41 is composed of a horizontal deflection counter 28 (11 bits), a memory 29 storing horizontal deflection signals, and a DA converter 38. As shown in FIG. 8, the input pulses of the horizontal deflection drive circuit 41 are synchronized with the vertical synchronizing signal V and the horizontal synchronizing signal H, and a pulse 6H having a repetition frequency six times that of the horizontal synchronizing signal H is used. The horizontal deflection counter 28 is reset by the vertical synchronizing signal V and counts the horizontal six times pulse 6H. This horizontal deflection counter 28 counts 6 times during IH and 240Hx6/H=1440 times during 12, and this count output is supplied to the address of memory 29. The memory 29 outputs horizontal deflection signal data (here, 8 bits) according to the address, and the D-A converter 38 converts it to h' as shown in FIG. 8 (FIG. 4(b)C). is converted into a horizontal deflection signal such as 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, a horizontal deflection signal of 6 steps is generated during the IH period. A deflection signal can be obtained.

As shown in Fig. 8, 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 1 of the horizontal deflection electrode 7, respectively.
8' 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.

The light is horizontally deflected so that the phosphors of G and B (R1, G1.B□, R2-G2.B2) are sequentially irradiated with H/6. Thus, in each line raster, the horizontal direction 1
For each of the 80 sections, the electron beam is R1゜al, 13i
Each phosphor 20 of t R2 and G2t B2 is sequentially irradiated with light.

Therefore, the electron beam is set to R1, G for each horizontal section of each line.
,,B□,R2,G2. By modulating 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. First, the composite video signal applied to the television signal input terminal 23 is applied to the color demodulation circuit 30, where the R-
The Y and B-Y color difference signals are demodulated, the G-Y color difference signals are matrix-synthesized, and further, they are combined with the luminance signal Y to generate R, G.

B primary color signals (hereinafter referred to as R, G, and B video signals) are output. These R, G, and B video signals are applied to 180 sets of sample and hold circuits 31-1 to 31-n. Each of the sample and hold circuits 31-1 to 31-1 has six sample and hold circuits for R□, G1, B1, R2, G2, and B2.

Those sample and hold outputs are each stored in memory 3.
2-1 to 32-n.

On the other hand, the reference clock oscillator 33 is composed of a PLL (phase locked loop) circuit or the like, and in this embodiment, the reference clock 6fsc is six times as large as 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 2%sc is added to the deflection pulse generation circuit 42, which generates a signal 6H six times the horizontal synchronizing signal H and signal switching pulses rxv g, + bt, rztg2r every H/6.
A pulse of bz (FIG. 4(b) B) is obtained.

On the other hand, the reference clock 6fsc is applied to the sampling pulse generation circuit 34, where it is delayed by one clock period by a shift register, so that the horizontal period (63,
The effective horizontal scanning period (approximately 50 μsec)
ec), 1080 sampling pulses R1□,
G1□, B11. R□29 G121 B121
R21t・G2□, B21. R22, G2. , B
2□~Rn,, Gnl.

B nl, RR2, On, + B R2 (Fig. 4 (
b) A) are generated in sequence, followed by one transfer pulse t. This sampling pulse R□1~B
n corresponds to each picture element when one line of the video to be displayed is divided into 360 picture elements in the horizontal direction, and its position is controlled so that it is always constant with respect to the horizontal synchronization signal H. .

These 1080 sampling pulses R, ~Bn2 are each 180 sets of sample hold circuits 31-1 to 31-3.
1-n, and one line of 180 is added to each sample-and-hold circuit 31-1 to 31-n.
R1゜G□ for each two picture elements when divided into
B1. R2, G2. Each B2 video signal is individually sampled and held. The 180 sets of R1, G, B, and R21GztB samples were held.
After completing the sample hold for one line, the video signals of No. 2 are transferred all at once to 180 sets of memories 32-1 to 32-n by a transfer pulse t, where they are held for the next horizontal period. This retained R1. G1°B1. R,,G
2. The signal of B2 is sent to switching circuits 35-1 to 35-n.
added to. The switching circuits 35-1 to 35-n each have R1, G□, B1. R2, G2. B2
It is composed of a tri-state or analog gate having individual input terminals and a common output terminal for sequentially switching and outputting these input terminals.

The output of each switching circuit 35-1 to 35-n is 180
The sample-and-hold R, G1
°B,,R,,G2. B. The reference pulse signal is pulse width modulated according to the magnitude of the video signal and output.

It is desirable that the repetition period of the reference pulse signal is sufficiently smaller than the pulse width of the signal switching pulse rit gzt b1 + r2t gzt b2,
For example, a ratio of about 1:10 to 1:100 is used.

The outputs of the pulse width modulation circuits 37-1 to 37-n are applied to each of the 180 conductive plates 15-1 to 15-n of the control electrode 5 of the display element as a control signal for modulating the electron beam. Added individually. Each switching circuit 35-1~
35-n is a switching pulse rxvg, bl applied from the switching pulse generating circuit 36;

Switching is controlled simultaneously by rz+gztb2.

The switching pulse generation circuit 36 receives the signal switching pulses from the deflection pulse generation circuit 42 described above.
+rz+g2+b2, each horizontal period is divided into 6 and the switching circuit 35 is divided into H/6.
-1 to 35-n, R1, G,, B□, R,
.

G2. A switching signal 1"xt g□+ bx* rz+ bt+ gz is generated so that each video signal of B2 is time-divided and sequentially output, and supplied to the pulse width modulation circuits 37-1 to 37-n.
occurs.

What should be noted here is that the switching circuit 35-1-
R1.35-n. G,,B□,R2,G,,B.

The supply switching of the video signal of G1. B□, R2, G2. B2
The switching and horizontal deflection of irradiation onto the phosphors are synchronously controlled so that they completely match both in timing and order. As a result, when the electron beam is irradiating the R1 phosphor, the irradiation amount of the electron beam is controlled by the R□ video signal, and G□, B□, R2
, G2. B2 is controlled in the same way, and R□, G1 . B□.

R2, G, B2 The light emission of each phosphor corresponds to the R1°G, B, R2, G2, . Each picture element is controlled by the video signal of B, and each picture element is displayed by emitting light according to the input video signal. Such control is performed simultaneously for 180 sets (2 picture elements each) for one line, and an image of 360 picture elements for one line is displayed, and an additional 24 picture elements are displayed.
This is done sequentially from the upper line on the 0 minute line.
One image will be displayed on the screen 9.

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 projected on the screen 9 in the same way as a normal television receiver.

Problems to be Solved by the Invention However, in the above configuration, multiple ICs for driving the beam flow control electrodes are used, so if the response characteristics of the individual ICs vary, the brightness will also vary and the image quality will deteriorate. I had a problem.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide an image display device in which image quality does not deteriorate even if the individual response characteristics of the beam flow control electrode driving ICs vary.

Means for Solving the Problems In order to solve the above problems, the image display device of the present invention has a response characteristic of a beam flow control electrode driving IC that receives a signal from a beam flow control signal generation circuit and amplifies the signal. A variable resistor is connected between the Vcc terminal of the IC and the power supply so that each voltage can be adjusted individually.

Effect: With the above-described configuration, by adjusting the variable resistor to align the individual response characteristics of the IC for driving the beam flow control electrode, variations in the response characteristics can be eliminated, and thereby variations in brightness can also be eliminated, thereby preventing deterioration in image quality. Try to eliminate it.

Embodiment Hereinafter, an image display device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a main part of a drive circuit for a beam flow control electrode of an image display device according to an embodiment of the present invention. In FIG. 1, 61a to 61b are a plurality of beam flow control electrode driving ICs 162a, and 62b to 62c are the above ICs.
A signal from a beam flow control signal generation circuit (not shown, but corresponding to the pulse width modulation (PWN) circuits 37-1 to 37-n in FIG. 4) is inputted to the pulse amplifier constituting the
Output after amplification.

63a to 63b are semi-fixed resistors as variable resistors for adjusting the response characteristics of the ICs 61a to 61b, respectively, and are interposed between the Vcc terminals of the ICs 61a to 61b and the power supply VB.

Regarding the image display device configured in this way, the following describes the first
The effect will be explained using diagrams. The beam flow control signal from the beam flow control signal generation circuit is input to the circuits C61a to 61b, amplified, and then applied to each of the conductive plates 15-1 to 15-n of the beam flow control electrode 5 in FIG. Ru. I
C61a to 61b consist of pulse amplifiers 62a to 62c, so if semi-fixed resistors 63a to 63b are inserted in series between the vCC terminal of IC61a to 61b and the power supply VB, a sudden increase in current at the rise of the signal will cause the IC to
Since the potential of the Vcc terminals of the resistors 61a to 61b decreases, the rise time becomes slower than when the semi-fixed resistors 63a to 63b are not provided. Therefore, by changing the resistance values of the semi-fixed resistors 63a to 63b, the response characteristics can be adjusted, and variations in response characteristics between ICs can be eliminated.

As described above, according to this embodiment, by inserting a semi-fixed resistor between the Vcc terminal of the beam flow control electrode driving IC and the power supply Vn, the response characteristics of each can be adjusted. It is possible to eliminate variations in brightness on the screen due to variations in response characteristics between ICs.

Effects of the Invention As described above, according to the present invention, the response characteristics can be adjusted by inserting a semi-fixed resistor between the IC for driving the beam current control electrode and the Cc terminal and the power supply. It is possible to eliminate variations in brightness on the screen, resulting in improved image quality.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a main part of a beam flow control electrode drive circuit of an image display device according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing the basic electrode configuration of an image display device to which the present invention is applied. Fig. 3 is an enlarged front view of the screen of the same plane image display device, Fig. 4 (a) and (b) are block diagrams and waveform diagrams showing the basic configuration of the drive circuit of the same image display device, and Fig. 5 is a vertical view. Waveform diagram for explaining the operation of deflection drive, Fig. 6(a)
(b) is a waveform diagram for explaining the operation of the line cathode drive circuit;
7(a) to 7(c) are waveform diagrams of each drive signal, and FIG. 8 is a waveform diagram for explaining the operation of the horizontal deflection drive circuit. 1... Back electrode, 2, 2a to 2o... Line cathode, 4.
...Vertical deflection electrode, 5... Beam flow control electrode, 7...
・Horizontal deflection electrode, 9... Screen, 37-1 to 37
-n...PWN circuit (beam flow control generation circuit), 61
a~61b...Beam flow control electrode driving IC563a
~63b... Semi-fixed resistance (variable resistance). Agent Yoshihiro Morimoto 1st Zuzono~63b-'#Kokugaku (Ajik) Eyes

Claims (1)

[Claims] 1. A screen coated with a phosphor that emits light when irradiated with an electron beam, a line cathode that generates an electron beam in each vertical section of the screen on which the screen is vertically divided, and a line cathode that generates an electron beam in each vertical section; separation means for separating the electron beam generated at the cathode into each horizontal section and irradiating the screen to the screen; a deflection electrode that deflects in stages; and a beam flow control electrode that controls the amount of emitted light from each pixel on the screen by controlling the amount of electron beams separated for each horizontal section irradiated onto the screen. and a plurality of ICs for driving the beam flow control electrode, into which output signals from a circuit that generates signals for driving the beam flow control electrode are input, and a Vcc terminal of the IC for driving the beam flow control electrode is connected to a power supply. An image display device with variable resistors interposed between them to adjust individual response characteristics.