JPS61242486A - Image display device - Google Patents

Abstract

PURPOSE:To constitute the titled device so that a character on a screen can be seen in a natural form, by constituting it so that a vertical deflection data to which a maldistribution method is applied, and a data for deflecting vertically all rasters at an equal interval are stored in each separate memory IC, and a vertical deflection waveform in case of a video input and a character input can be switched. CONSTITUTION:A data for a malfistibution, and a data for deflecting a raster at an equal interval are stored in a memory IC 51 and a memory IC 52, respectively. Also, in both the ICs 51, 52, the corresponding vertical deflection data are stored in the same address. In case of a video input, a maldistribution is executed by switching a chip select signal to a side (a) by a switch 53, and in case of a character input, a vertical deflection is executed at an equal interval by switching said signal to a side (b). In such a way, in case when the maldistribution is being executed, a character which is reflected unnaturally can also be reflected naturally by switching the switch.

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. Deflect the beam vertically to display multiple lines.

The present invention generally relates to a device for displaying television images.

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, vertical focusing electrodes (3) (3'), a vertical deflection electrode (4), and a beam current 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 (2o). 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 so as to generate a thermionic beam by passing an electric current 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. Furthermore, a one-plane electron beam emitting cathode may be used instead of the back electrode (1) and the line 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 (20), 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 arranged in waves at small intervals in the horizontal direction (the intervals are such that they almost touch each other). 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 (10),
Conductors (
13) (13') is provided. Then, a vertical deflection voltage is applied between the opposing conductors (13 bars 13') to deflect the electron beam in the vertical direction. In this example, a pair of conductors (13) (13
), the electron beam from one line cathode (2) is deflected vertically to a position corresponding to 16 lines. and 16
15 line cathodes (2) with vertical deflection electrodes (4)
15 pairs of conductors corresponding to each of the electron beams are constructed, and in the end, 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 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 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, the conductive plate for the control electrode (5) (
If 18080 pieces of 15-1) to (15-n) are installed, horizontal 1
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 (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 (1g) (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 made up 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. ) to accelerate so as to collide 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. In FIG. 2, the broken lines drawn on the screen (9) indicate the divisions in the vertical direction that are displayed corresponding to the plurality of line cathodes (2), and the two-dot chain lines indicate the divisions in the vertical direction that are displayed corresponding to the plurality of line cathodes (2). ) shows the horizontal divisions displayed corresponding to each of them. As shown in an enlarged view in FIG. 3, in one section partitioned by these two, there are R, G, and H phosphors (20) for two picture elements in the horizontal direction.

It has a width of 16 lines in the vertical direction. For example, the size of the first section is 1 kaku in the horizontal direction.

The vertical direction is 9oi.

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, 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), V3 for vertical focusing electrode (3) (3'). A DC voltage of V,'' is applied to the horizontal focusing electrode (6), V8 to the accelerating electrode (8), and V to the screen (9).

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 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 (4o), a vertical synchronizing signal V and a horizontal synchronizing signal H shown in FIG. 5 are used. 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 vertical deflection signal corresponding to each address.
It is converted into vertical deflection signals of υ and υ' shown in the figure (FIG. 4(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-o. FIG. 6(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. 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, 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 ■ 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 driving pulse a' using the inverted version of the output (LSB+3) of the vertical deflection counter (25) as a clock. This drive pulse a'
~0' is inverted and converted into a line cathode drive pulse a~0 which is set to a low potential only during each pulse period and set to a high potential of approximately 20 volts during other periods (Fig. 4(b)E). , are added to each line cathode (2a) to (2o).

Each line cathode (2a) to (2o) is heated by a current being applied during the high potential of the drive pulse a-o, so that it can emit electrons during the low potential period of the drive pulse a'=o. The heated state is maintained. As a result, 15 wire cathodes (
Electrons are emitted from 2a) to 2o only during the 16H period when low potential drive pulses a-o are applied to each of them. During periods when a high potential is applied, the line cathode (2a ) to (2o) is positive, so no electrons are emitted from the line cathodes (2a) to (2o).Thus, at the line cathode (2), the effective vertical scanning During the period, the upper wire 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 relationship between the line cathode drive pulse a''-'o and the vertical deflection signals υ and υ' will be explained with reference to FIG.

FIG. 7(a) is a waveform diagram of a line cathode drive pulse.

(b) is a waveform diagram of the vertical deflection signal, and (C) is a waveform diagram of the horizontal deflection signal. Vertical deflection signal υ in FIG. 7(b).

υ' changes by IH in 16 steps during the 16H period of each line cathode pulse a to 0 in FIG. 7(,).

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 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.
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 sequentially from the top of the 15 line cathodes (2a) to (2o) for a period of 16H, and each electron beam is sequentially emitted in 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 up to the 0th line, and a total of 240 raster 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 2, 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 illuminates the R9G and B capacitive light bodies (20) corresponding to two picture elements on the screen (9). Fig. 2 shows the vertical and horizontal divisions, and 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. is for convenience of explanation.

1 picture element is R, G1. B, and the other is R2, G,,B2
shall be.

Next, the horizontal deflection drive circuit (41) is composed of a horizontal deflection counter (2g) (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 the vertical synchronizing signal V and the 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 synchronizing signal V and receives the horizontal six times the pulse 6.
Count H. This horizontal deflection counter (28) is applied 6 times during IH and 240Hx 6/H= during 1V.
It counts 1440 times, and this count output is stored in the memory (2
9) is supplied to the address.

The memory (29) outputs horizontal deflection signal data (here, 8 bits) according to the address, and the data is sent to the D-A converter (38) 1', as shown in FIG. 8 (FIG. 4(b)C). ri,h
' is converted into a horizontal deflection signal such as '. In this circuit, 5
There is a memory address for storing horizontal deflection signals corresponding to each of x240 lines, and by storing 6 pieces of regular data in the memory for each line,
A six-step wave horizontal deflection signal can be obtained during the IH period.

As shown in FIG. 8, these horizontal deflection signals are a pair of horizontal deflection signals ri and h' that change in six steps, both of which have a center voltage of V, and h decreases sequentially.

h' changes in opposite directions so as to increase sequentially. These horizontal deflection signals h' are applied to electrodes (18) and (18') of the horizontal deflection electrode (7), respectively.

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 (R4, G□, B□, R,, G2.B
, ) are horizontally deflected so that the phosphors are sequentially irradiated for H/6 periods. Thus, in each line raster, the electron beam is R1, G for each of the 180 sections in the horizontal direction.
, , B, , R, , G, , B, each phosphor (20) is sequentially irradiated.

Therefore, the electron beam is set to R1, G for each horizontal section of each line.
1. B1. R,,G2. By modulating the video signal of B, a color television image can be displayed on the screen (9).

Next, the modulation control portion of the electron beam will be explained. First, the composite video signal applied to the television signal input terminal (23) is applied to the color demodulation circuit (30), 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.

Furthermore, they are combined with the luminance signal Y, R2O,B
The respective 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 sample hold circuit (31-1) ~ (
31-n) each have six sample-and-hold circuits for R1, G, B, R2, G2, and B2. These sample and hold outputs are respectively applied to holding memories (32-1) 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 r1m gtt bt, ratg
A pulse of z* 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 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□, B11. R1□, G12. B1
．． ,R2,,G,□.

B21. R,,,G,,,B22~Rn,,Gn,,B
n,,Rn,.

"** Bn2 (Fig. 4(b) Corresponding to each picture element when divided into picture elements in 360 directions, the position of the length is controlled to always be constant with respect to the horizontal synchronization signal H.

These 1080 sampling pulses R□1 to Bn each form 180 sets of sample and hold circuits (31-1).
~(31-n) are added six times each, thereby each sample hold circuit (31-1) ~(31-n)
When one line is divided into 180 parts, each 2
Each picture element's R□, G, B, R, G, B video signals are individually sampled and held. The 180 sets of R engineering samples were held, G1.
B1. R2°G2. The video signal of B is stored in 180 sets of memory (32-1) after completing the sample hold for one line.
~(32-n) are transferred all at once by a transfer pulse t, and held here for the next horizontal period. This retained R-work.

G,, B1. The R, , G, , B2 signals are applied to switching circuits (35-1) to (35-n). Switching circuits (35-1) to (35-n) each have R1
, G1. It is composed of a tri-state or analog gate having individual input terminals for B1°R, , G, , B and a common output terminal for sequentially switching and outputting 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. B1. 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 same as the signal switching pulse rat gle blt rz.
It is desirable that the pulse width is sufficiently smaller than the pulse width of +gxe 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 rxp gtt blu ri9gas bz applied from the switching pulse generating circuit (36). The switching pulse generation circuit (36) receives the signal switching pulses rat gl, ble K'zp from the aforementioned deflection pulse generation circuit (42).
gtt bt, each horizontal period is divided into 6 and the switching circuits (35-1) to H/6 are controlled by H/6.
(35-n), R□, G,, B1. This switching signal r1*g1*b1tra9gzt is used to time-divide and sequentially output the R, G, and B2 video signals and supply them to the pulse width modulation circuits (37-1) to (37-n).
Generate bz.

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

G2. B2 video signal supply switching and electron beam R processing using the horizontal deflection drive circuit (41)
R2#G, , 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 R1 video signal, and the G,
, B1. R,,G,,B are controlled in the same way, and each picture element's R□l 01 t B i lR2,G, ,
B2 The light emission of each phosphor corresponds to the R1 and G elements of that picture element.

B1. R2, G2. Each picture element is controlled by the video signal of B2, and each picture element is displayed by emitting light according to the input video signal. Such control is performed simultaneously for 180 sets (2 pixels each) for one line, and an image of 360 pixels per line is displayed, and an image of 360 pixels per line is displayed.
This is performed sequentially for the minute lines starting from the upper line, and one image is 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 displayed on the screen (9) in the same way as a normal television receiver.

In such an image display device, by unevenly distributing the images, horizontal lines occurring at the horizontal boundaries of image display sections on the screen are made less noticeable.

This uneven distribution will be discussed below. In FIG. 9, the vertical deflection data in the memory (27) in the vertical deflection drive circuit (40) is changed to divide the beam deflection position into eight blocks.
The electron beam spacing within a block is narrower than the deflection spacing of electron beams (white circles) by conventional deflection means, and the deflection spacing between each block is wider than the deflection spacing of the conventional deflection means. 10th
Figure 11 shows the vertical deflection position of the conventional electron beam (
(white circles) and the vertical deflection position of the electron beam (black circles) using this deflection method.

The effects of the embodiment will be explained based on FIG. 1I. In the case of conventional vertical deflection, the deflection interval is Lo, as shown at the bottom of FIG. 11(B).

When this deflection method (uneven distribution method) is used, the deflection interval is recognized as the interval between a set of deflection positions, and therefore becomes a deflection interval of Ll (i>L). Figure 10 Mori, Ll
Let me show you. When using such an uneven distribution method, Ll>
It becomes L. Therefore, when the deviation in the deflection position is ΔL, ΔL/Lo > ΔL/L, and when the uneven distribution method is used, the noticeable proportion of the variation ΔL is smaller. In other words, the variation in beam deflection position ΔL can be masked by the uneven distribution method without damaging the amount of information. Therefore, the entire screen is ΔL
It looks uniform without any discomfort. Further, according to this configuration, when assembling the image display device, it becomes possible to reduce the assembly precision of electrodes and the like related to vertical deflection.

This also leads to major cost reductions.

Problems to be Solved by the Invention As mentioned above, conventional image display devices use the uneven distribution method, and when a video signal is input using this uneven distribution method, the signal on the horizontal boundary of one image display section is Horizontal lines become less noticeable. However, in the case of character input such as computer input, the distance between the dots composing a character becomes wider at boundaries where they are unevenly distributed, making a single character look unnatural.

Means for Solving the Problems In conventional image display devices, vertical deflection data is stored in one memory IC, whereas the vertical deflection data to which the uneven distribution method is applied are stored at equal intervals. The data for vertically deflecting all rasters is configured to be stored in separate memory ICs, these two ICs are connected in parallel, the addresses, etc. match, and the thread path to which the chip select signal is sent is connected. 6 is configured so that the vertical deflection waveforms for video input and character input can be switched by switching means.

Effect: With this configuration, it is possible to change the vertical deflection waveform between video input and character input in such an image display device, and to switch between uneven distribution and non-uniform distribution, so that the characters on the screen can also have a natural shape. It will be visible.

EXAMPLE An example of the present invention will be described below based on the drawings. Here, in FIG. 4, memory C in the memory (27) storing vertical deflection data will be taken as an example. This memory I
The same memory IC as C is connected in parallel to □ as shown in Figure 1. In other words, the memory IC (51) stores data for uneven distribution,
The memory IC (52) stores data for deflecting the raster at equal intervals. Also, both ICs (51) (52
), the corresponding vertical deflection data are stored at the same address. For video input, switch (53)
), the uneven distribution is performed by switching the chip select signal to the a side.

In the case of character input, by switching to the b side, vertical deflection is performed at equal intervals. Memory in Figure 4 (27
The same applies to the memory d in ).

Effects of the Invention □ According to the present invention, it is possible to perform uneven distribution in the case of video input and not to perform uneven distribution in the case of character input by switching a switch. Even characters that appear unnatural can be made to look natural by switching the switch.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. Fig. 2 is a diagram showing the basic electrode configuration of the image display device, Fig. 3 is a diagram showing the minimum unit configuration of the image display device on the screen, and Fig. 4 is a block diagram of the drive circuit and each part in the device. Waveform diagram, Figure 5 is a correlation diagram between vertical deflection voltage and horizontal synchronizing signal, Figure 6 is a diagram of various timing charts, Figure 7 is a diagram showing the relationship between cathode drive pulse, vertical deflection signal, and horizontal deflection signal, Figure 8 is a correlation diagram of the horizontal deflection voltage ζ with the horizontal synchronizing signal, Figure 9 is a diagram showing the vertical deflection waveform and beam deflection position by the image display device in the case of uneven distribution, and Figure 10
The figure shows the beam deflection position based on the uneven distribution method, and FIG. 11 is a diagram for explaining the effect based on the beam position when using the uneven distribution method 2. (2) (2a) to (2o)... line cathode, (4)...
・Vertical deflection electrode, (5)...Beam flow control electrode, (7
)...Horizontal deflection electrode, (9)...Screen, (2
0)...phosphor, (24)...synchronous separation circuit, (2
5) Vertical deflection counter, (26) Line cathode drive circuit, (27) (51) (52) Memory, (
28)...Horizontal deflection counter, (29)...Memory, (30)...Color demodulation circuit, (40)...Vertical deflection drive circuit, (41)...Horizontal deflection drive circuit, (42
)...Deflection panel generation circuit, (53)...Switch agent Yoshihiro Morimoto Fig. 1 Now Fuguzere 2 Toy l Fig. 3 2θ Water & P Ri M/JJ Gep Fig. 5 hl No. Fig. J) (Bn e Pa Fig. β Fig. 7 ↑ I7° o 124 example Fig. 1 ρ θ 7° Lotsu 7 Fig. i/Fig. rA) Rod (B)

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, and the electron beam generation source; The display element includes an electrostatic deflection electrode that deflects the beam on the way to the screen, and a control electrode that controls the emission intensity by controlling the amount of the electron beam irradiated onto the screen. It has a vertical deflection memory that has unevenly distributed data that consists of sets of several rasters each with wide spacing between sets, and a vertical deflection memory that has data for irradiating all rasters onto the screen at equal intervals. An image display device in which these memories can be switched using a switch means.