JPS62186677A - Picture display device - Google Patents

Abstract

PURPOSE:To normally display a picture even when the irregularity is produced at the time of working and assembling of an electrode by controlling the gain of plural signal amplifier and output circuits. CONSTITUTION:The two outputs of a D/A converter 39 are inputted to the signal amplifier and output circuits 43, 43', the two outputs V1, V1' and V2, V2' of the circuits 43, 43' are supplied to one conductor 13 and the other conductor 13' of a vertical deflection electrode 4. At the time of the working and the assembling of the electrodes 13, 13', when they are assembled in an irregular mode, an uneven picture having the difference in amplitude between the central part and the peripheral part of a picture is obtained. In such a case, the amplitude of the circuits 43, 43' is individually controlled by the gain control circuit 44, thereby, adjusted so as to have the even picture.

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. 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 horizontally 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) in the figure).
2d) only four are shown). In this example, it is assumed that 15 are provided. them (2a
) to (20). 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. These line cathodes (2a) to (2o) are heated by generating a thermionic beam when a current is passed through them, and as described later, the line cathodes (2a) to (2o) are heated sequentially for a certain period of time. It is controlled to emit an electron beam at a time.

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). taken out through the slit (10),
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 slits (10) 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 (intervals that are almost touching). 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 (lO),
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.

In this example, 180 control electrode conductive plates (15-1)
~(15-n) are provided. (Only 9 lines are shown in the figure). Each of the control electrodes (5) separates and extracts the electron beam into two picture elements in the horizontal direction, and controls the amount of electron beam passing therethrough in accordance with a video signal for displaying each picture element. Therefore.

If 180 conductive plates (15-1) to (15-n) for control electrodes (5) are provided, 360 pixels can be displayed per horizontal line. Furthermore, in order to display images in color, each picture element is displayed using phosphors of three colors, R, G, and H, and each control electrode (5) has R and G for two picture elements.

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 (15-1) 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 (+8) ( 18') is applied with six levels of horizontal deflection voltage to deflect the electron beam of each picture element in the direction of water V, and the two silks 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 (19) installed horizontally in the same position as the vertical deflection electrode (4), and it directs the electron beam to the screen (9) with sufficient energy. Accelerate to cause a collision.

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). Two phosphors (20) of three colors RlG and B are used 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.

It is applied in vertical stripes. In Fig. 5, the broken lines drawn on the screen (9) represent multiple line cathodes (2
), and the two-dot chain line indicates a horizontal division displayed corresponding to each of the plurality of control electrodes (5). As shown in the enlarged view in Figure 6, one section partitioned by these two has R, G, and B phosphors for two picture elements in the horizontal direction (
20), and has a width of 16 lines in the vertical direction. For example, the size of one section is 1 in the horizontal direction.
m+.

The vertical direction is 9+nm.

Note that in FIG. 5, the length in the horizontal direction is greatly enlarged relative to the length 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 explained.

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), V1 for vertical focusing electrode (3) (3')
HV3', horizontal focusing electrode (6) has V accelerating electrode (8)
A DC voltage of V is applied to the screen (9), and a DC voltage of vg is applied to the screen (9).

Next, a composite video signal of a television signal is applied to the input terminal (23), and a vertical synchronizing signal V and a horizontal synchronizing signal I 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 vertical deflection signal storage (27), and a digital-to-analog converter (39) (hereinafter referred to as a DA converter). As input pulses to the vertical deflection drive circuit (40), a vertical synchronizing signal V and a horizontal synchronizing signal H shown in FIG. 8 are used. Vertical deflection counter (25) (
8 bits) are reset by the vertical synchronizing signal V and counting 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 vertical deflection signal corresponding to each address.
It is converted into a vertical deflection signal of υ9υ' shown in the figure (FIG. 7(b)D). 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 V and the output of the vertical deflection counter (25) to create line cathode drive pulses a to 0. FIG. 9(a) shows the vertical synchronization signal V,
The relationship between the horizontal synchronizing signal H and the lower 5 bits of the vertical deflection counter (25) is shown. FIG. 9(b) shows a method of creating line cathode drive pulses a' to 0' every 16H using these signals. In FIG. 9, 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 by an R-S flip-flop using the vertical synchronization signal V and the output (LSB+4) of the vertical deflection counter (25), and the line cathode drive pulse b'~0 ′ uses a shift register,
This can be obtained by transferring the line cathode drive pulse a' using the inverted version of the output (LSB+3) of the vertical deflection counter (25) as a clock. This drive pulse a'
~oI 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. 7(b)E), It is added to each line cathode (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-0. State is preserved. As a result, 15 wire cathodes (2a)
From ~(2o), low potential drive pulses a~0 are respectively applied.
Electrons are emitted only during the 16H period when . During periods when a high potential is applied, the line cathode (2a ) to (2o) is more positive, so no electrons are emitted from the line cathodes (2a) to (2o). Thus, in the line cathode (2), electrons are sequentially emitted from the upper line cathode (2a) to the lower line cathode (2o) for each 16H period during the effective vertical scanning period. The emitted electrons are pushed forward by the back electrode (1), pass through the opposing slits (10) of the vertical focusing electrode (3), and are 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. 10. 10th
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. 10(b).

υ′ is 1 of each line cathode pulse a ” o in Figure 1(a)
During the 6H period, the IH value changes in 16 steps.

The center voltage of both vertical deflection signals υ and υ' is V, so that υ increases sequentially and υ' decreases sequentially.
They are designed to change in opposite directions. These vertical deflection signals υ and υ' are applied to the electrodes (13) and (13') of the vertical deflection electrode (4), respectively, resulting in an electron beam generated from the respective line cathodes (2a) to (2o). is vertically deflected in 16 steps.

As mentioned above, one electron beam is deflected on the screen (9) so that a raster of 16 lines is drawn one line at a time from the top.

As a result of the above, electron beams are emitted from the 15 line cathodes (2a) to (20) sequentially for a period of 16H starting from the top, and each electron beam is sequentially emitted one line from top to bottom within 15 sections in the vertical direction. On the screen (9), from the first line at the top to the 24th line at the bottom.
The electron beam is vertically deflected one line at a time until the 0th 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 6, one of them
The classification is shown. The amount of electron beam passing through each section is controlled by a control electrode (5), and is focused in the horizontal direction by a horizontal focusing electrode (6) to become one narrow electron beam.

The light is deflected horizontally in six steps by the horizontal deflection means described below, and is sequentially irradiated onto each of the RlG and B phosphors (20) for two picture elements on the screen (9). FIG. 6 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,...
G□, B and the other R,,G,,B.

shall be.

Next, the horizontal deflection drive circuit (41) is composed of a horizontal deflection counter (28) (11 bits), a memory (29) that stores horizontal deflection signals, and a DA converter (38). . The input pulses of the horizontal deflection drive circuit (41) are a vertical synchronizing signal V and a horizontal synchronizing signal H, as shown in FIG.
A pulse 6H with a repetition frequency six times that of the horizontal synchronizing signal H is used. The horizontal deflection counter (28) is reset by the vertical synchronization signal ■ and receives the horizontal six times the pulse 6.
This horizontal deflection counter (28
) is 6 times in the opening of L H, 1 ■! for 240HX6/H
= 1440 times, and this count output is stored in the memory (
29).

The memory (29) outputs horizontal deflection signal data (here, 8 bits) according to the address, and the D-A converter (38) outputs the data as shown in FIG. 11 (FIG. 7(b)C). ,h
' is converted into a horizontal deflection signal such as '. In this circuit, 6
There is a memory address for storing the horizontal deflection signal corresponding to each of the 240 lines, and by storing 6 pieces of regular data for each line in the memory, a 6-step wave horizontal deflection signal is generated during the IH period. can be obtained.

This horizontal deflection signal is a pair of horizontal deflection signals ri and h' that change in six steps as shown in FIG. They change in opposite directions as they move forward. 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 (R work, G work = Bt, Rz, Gt-
It is horizontally deflected so that the phosphor of Bz) is sequentially irradiated for H/6 periods. Thus, in each line raster, the electron beam is R for each of the 180 sections in the horizontal direction.
G1. B,, R2, G,, B2 each phosphor (2
0) are sequentially irradiated.

Therefore, the electron beam is set to R1, G for each horizontal section of each line.
, B, R2, G, , B, by modulating the video signals, 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-Y and B-Y color difference signals are demodulated and the G-Y color difference signal is demodulated. The signals are matrix-synthesized, and further, they are combined with the luminance signal Y to form each primary color signal of R2O and 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-mouth) are added. Each sample-and-hold circuit (31-1) to (31-n) has six sample-and-hold circuits for R1, G4, B, R2, G2, and B2. These sample and hold outputs are stored in the holding memories (32-1) to (32-1), respectively.
−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)
, and the signals 6H and I (/
Signal switching pulse every 6 r1+ g1+ blp rz
A pulse of tgz+t)z (FIG. 7(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 cycle by a shift register, so that the effective horizontal scanning period (approximately 50μ5ec) of the horizontal period (63,5μ5ec) is applied. ), 1080 sampling pulses R1□, G1□+Bt□, R,2, G12 . B12
．． R21, G21°B, 1. R22, G2z, B22
~Rn,, Gnl, Bn,, Rn2°Go2. B
n2 (FIG. 7(b) A) are generated sequentially, and then one transfer pulse is generated. This sampling pulse length, ~Bn2, 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 always constant with respect to the horizontal synchronizing signal H. controlled so that

These 1080 sampling pulses R11 to Bn,,
each has 180 sets of sample and hold circuits (31-1
) to (31-n), and thereby each sample-hold circuit (31-1) to (31-n)
When one line is divided into 180 parts, each 2
Picture elements R□, G,, B,, R2, G,, B,
Each video signal is individually sampled and held. The 180 sets of R engineering, G1.
B□, R2゜G,, B2 video signals are stored in 180 sets of memory after one line of sample and hold is completed (32-1)
~(32-n) are transferred all at once by a transfer pulse and held here for the next horizontal period. This held R1°G□, B, , 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 R, , G1 . B.

It is composed of a tri-state or analog gate having individual input terminals for R, G, 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. B engineering, R2, G2. 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 t gtt bx+ ra
It is desirable that the pulse width is sufficiently smaller than the pulse width of ygxe bz, for example, 1:10 to 1:100.
A certain degree is used.

The outputs of the pulse width modulation circuits (37-1) to (37-n) are used as control signals for modulating the electron beam to the 180 conductive plates (15-1) to the control electrodes (5) of the display element.
(15-n) respectively. The switching circuits (35-1) to (35-n) are simultaneously controlled by switching pulses rit gtp blt rzt gtt b2 applied from the switching pulse generating circuit (36). The switching pulse generation circuit (36) is a signal switching pulse T'xt gap t)tt r from the aforementioned deflection pulse generation circuit (42).
zt gap b2, each horizontal period is divided into 6 and a switching circuit (35-
1) to (35-n), R, G, B1.
R2, G2. The switching signal r1tgaybl is configured to time-divide and sequentially output each video signal of B2 and supply it to the pulse width modulation circuits (37-1) to (37-n).

Generate rzt gzt bt.

What should be noted here is that the switching circuit (35-1
) R,,G,,B□,R, in ~(35-n).

G, , B2 video signal supply switching and electron beam R□, G engineering * Be1l by horizontal deflection drive circuit (41)
R21G, , horizontal deflection of irradiation switching to the phosphor of B2.

They are synchronously controlled to completely match both 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 R4 video signal, and the G
L -B 1- Rs , G z , B t are also controlled in the same way, and R, , Go, B 1 of each picture element
゜R, , G, , Bt each phosphor emits light from R1,
G1°B1. Each picture element is controlled by the R, G, B video signals, and each picture element is displayed by emitting light according to the input video signal. Such control is performed simultaneously for 180 sets (2 picture elements each) for one line, and an image of 360 picture elements per line is displayed, and an image of 360 picture elements for one line is displayed.
The H minute line is performed sequentially from the upper line,
One image will be displayed on the screen (9).

and one or more such operations are performed on one or more of the input television signals.
This is repeated for each field, and as a result, a moving television image is displayed on the screen (9) in the same way as a normal television receiver.

Problems to be Solved by the Invention However, the configuration described in Section 2 has the problem that if variations occur during electrode processing and assembly, it is not possible to display a uniform image over the entire screen. .

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an image display device that can display a uniform image even if variations occur during processing and assembly of electrodes.

Means for Solving the Problems In order to solve the above problems, the image display device of the present invention includes:
A plurality of signal amplification/output circuits are provided to drive vertical deflection electrodes divided into a plurality (!11 times), and the gain of the signal amplification/output circuits can be controlled simultaneously or individually.

Effect of the present invention is that due to the circuit configuration described above, variations occur during processing and assembly of the electrodes, and the amplitude of the image displayed on the screen differs between the center and the periphery of the screen in each vertical section, resulting in non-uniformity. Even when a large image is displayed, by individually controlling (adjusting) the gains of multiple drive circuits that drive the vertical deflection electrodes, it is possible to make the amplitudes of each vertical segment the same, and the above-mentioned multiple A uniform image is displayed by simultaneously controlling (adjusting) the gains of the drive circuits.

Embodiment Hereinafter, an image display device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a block diagram of an image display device according to an embodiment of the present invention.

In Figure 1, (39) is the D-A converter shown in Figure 7, and (43) and (43') are signal amplification/output circuits into which the two outputs of the D-A converter (39) are respectively input. , the respective two outputs V of the circuits (43) (43')
1 T V 1' and v,,v,' are the conductor (13) on the side of the vertical deflection electrode (4) and the conductor (13) on the other side of the vertical deflection electrode (4).
3'). (44) is a gain control circuit,
The output signals Va, , va2 are respectively supplied to signal amplification/output circuits (43) (43') to control the amplitude.

In the image display device configured as described above, the first
This will be explained using FIGS. FIG. 2 shows a specific circuit example of the gain control circuit (44) shown in FIG.

Transistor Q...Q3. Q is a current mirror circuit, and the resistors R1, R,, R, are set to the same resistance value (Rz=R
x=R4), transistors Q, , Q3 . The currents j□+12113 flowing through Q become equal. The base voltage E of the transistor Q2 is a voltage obtained by integrating the current flowing through the resistance value r□ of the variable volume VR1, E=i1Xr. Also, vaX which is the output of the gain control circuit (44)
The voltage of and va2 is the resistance value of variable volume VR, r,
Then, it becomes as follows.

Va1 == E-VOE (r2 X l 3)
...(1) VG2=E-VBE-(RzXiz)
-(2) Here, VBE is the base of transistor Q2.
Since the voltage between the emitters and the currents 11, 12, and j are equal, (1) and (2) formula % formula % (3) Output voltage V If you try to change the voltages of O1 and Vaz at the same time, rl, that is, variable volume VR , can be changed by changing the resistance value of the resistor R2, and when changing them individually, change the resistance value r2 of the variable volume VR2 (the variable range of the resistance value can be made larger or smaller than the resistance value of the resistor R2). By doing this, it is possible to vary VO by changing VO.

Figure 3 shows the signal amplification/output circuit (4) connected to the vertical deflection electrode (4).
3) Output VL of (43')? VL' and yztV
, ' are supplied, and the conductor of the vertical deflection electrode (4) is divided into two parts (13a) in the front and back in the beam flow direction.
(13b) and (13a') (13b'),
One output V l l ■2 is one conductor (13a)
(13b), the other output V21V2' is supplied to the other conductors (13a') and (13b'), respectively.

In the circuit configuration as described above, in an image display device assembled due to variations in processing and assembly of each electrode, a part of the reproduced image is shown in Figure 4(a), in the center of the screen. This results in an uneven image with different amplitudes between the central and peripheral areas, but even in such a case, the signal amplification/output circuit (4
3) By individually controlling the amplitude of (4'3') by a gain control circuit (44).

Adjustments can be made to obtain a uniform image as shown in FIG. 4(b).

Effects of the Invention As described above, according to the present invention, by controlling the gains of a plurality of signal amplification/output circuits, images can be displayed normally even if variations occur during electrode processing/assembly. .

[Brief explanation of drawings]

FIG. 1 is a block diagram showing essential parts of an image display device according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing an example of a gain control circuit, and FIG. 3 is a configuration example of a vertical deflection electrode according to the present invention. FIG. 3 is a perspective view showing how to connect. 4(a) and 4(b) are diagrams showing a part of a screen for explaining the difference in operation between the conventional method and the present invention, and FIG. 5 shows the basic electrode configuration of an image display device to which the present invention is applied. FIG. 6 is a perspective view showing the minimum unit configuration of this image device on the screen, FIGS. 7(a) and (b) are block diagrams and waveform diagrams of the drive circuit in the same device, and FIG. Correlation diagram between vertical deflection voltage and horizontal synchronization signal, Figure 9 is a diagram showing various timing charts 1 to 1, Figure 10 is a diagram showing the relationship between cathode drive pulse, vertical deflection signal, and horizontal deflection signal, Figure 11 is horizontal deflection FIG. 3 is a correlation diagram between voltage and horizontal synchronization signal. (1)...Back electrode, (2), (2a) to (20)
... line cathode, (4) ... vertical deflection electrode, (5) ...
・Beam flow control electrode, (7)...Horizontal deflection electrode, (9
)...Screen, (13) (13')...Conductor, (24)...Synchronization separation circuit, (25)...
Vertical deflection counter, (z7)...memory, (28)
... Horizontal deflection counter, (29) ... Memory, (
30)...Color demodulation circuit, (33) (39)...D
/A converter, (40)...Vertical deflection drive circuit, (4
1)...Horizontal deflection drive circuit, (42)...Deflection pulse generation circuit, (43) (43')...Signal amplification/output circuit, (44)...Gain control circuit representative Mori Hon Gi Private Eraser 1 Figure G2 Figure 2 Figure 3 II';v2vI'7.2' Figure 4 Figure 6 D ↑ Suehira Iku-1i Now Figure 7 (1) No Cp Figure 1 Figure 9 Figure ta＞ (Jino 6・'

Claims (1)

[Claims] 1. A screen coated with a phosphor that emits light when irradiated with an electron beam; an electron beam source that generates an electron beam for each vertical section of the screen divided into a plurality of vertical sections; separating means for separating the electron beam generated by the electron beam source into each horizontal section and irradiating the screen onto the screen; a deflection electrode that deflects in a plurality of stages; a beam flow control electrode that controls the amount of light emitted from each pixel on the screen by controlling the amount of electron beams separated into the horizontal sections irradiated onto the screen; , a focusing electrode that controls the size of light emitted by the electron beam on the phosphor surface in each pixel, a back electrode that controls the amount of electron beam from the electron beam source, and an accelerating electrode that accelerates the electron beam to the screen. , the vertical deflection electrode for vertically deflecting the electron beam is divided into a plurality (integral multiples) before and after the beam flow direction, and a plurality of signal amplification/output circuits for driving the vertical deflection electrode are provided, An image display device in which the gain of the amplification output circuits can be controlled simultaneously or individually.