JPH0746575B2 - Image display device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device having a plurality of line cathodes as electron sources.

2. Description of the Related Art Conventionally, a cathode ray tube has been mainly used as a display element for displaying a color television image, but the conventional cathode ray tube has a very long depth compared to the size of the screen, and a thin television receiver. Was impossible to create. Further, recently, EL display elements, plasma display devices, liquid crystal display elements, etc. have been developed as flat panel display elements, but all of them are insufficient in terms of performance such as brightness, contrast and color display and are put to practical use. Has not reached the end.

To achieve a flat panel display device using an electron beam, the present applicant has filed Japanese Patent Application No. 56-20618 (Japanese Patent Laid-Open No. 57-1618).
No. 35590), a new display device was proposed.

This is because when the screen on the screen is divided into a plurality of sections in the vertical direction, an electron beam is generated for each section, and each electron beam is deflected in the vertical direction to display a plurality of lines. However, the television image is displayed as a whole.

First, a basic structure of the image display device used here will be described with reference to FIG. This display element comprises a back electrode (1), a line cathode (2) as a beam source, vertical focusing electrodes (3) and (3 ') vertical deflection electrodes (4), and a beam current control electrode in this order from the rear to the front. (5), a horizontal focusing electrode (6), a horizontal deflection electrode (7), a beam accelerating electrode (8) and a screen (9) are arranged, and these are formed of a flat glass bulb (not shown). It is housed inside a vacuum. The line cathode (2) as a beam source is stretched horizontally so as to generate an electron beam that is linearly distributed in the horizontal direction. A plurality of such line cathodes (2) are vertically arranged at appropriate intervals. Books (only four (2a) to (2d) are shown in the figure) are provided. In this example, 15 are provided. Let them be (2a) to (2o). These wire cathodes (2) are formed, for example, by coating the surface of a tungsten wire of 10 to 20 μφ with an oxide cathode material for emitting thermoelectrons. These line cathodes (2a) to (2o) are heated so that a thermoelectron beam can be generated by passing an electric current, and as described later, the line cathodes (2a) are sequentially heated for a certain time. The electron beam is controlled to be emitted one by one. The back electrode (1) suppresses the generation of an electron beam from a line cathode other than the line cathode controlled to emit the electron beam for a certain period of time, and directs the generated electron beam only in the forward direction. And push it out. The back electrode (1) may be formed by a coating film of a conductive material attached to the inner surface of the rear wall of the glass bulb. A planar 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 long slit (10) in the horizontal direction facing each of the line cathodes (2a) to (2o), and the electron beam emitted from the line cathode (2). Is taken out through the slit (10) and vertically focused. Horizontal 1 line (360 picture elements)
Take out the electron beam at the same time. In the figure, only one horizontal section is shown. Slit (1
In 0), crosspieces may be provided at appropriate intervals on the way,
Alternatively, a plurality of rows of through-holes arranged side by side in the horizontal direction at small intervals (intervals at which they are almost in contact) may be substantially configured as slits. The vertical focusing electrode (3 ') is similar.

A plurality of vertical deflection electrodes (4) are arranged horizontally in the middle of each of the slits (10), and conductors (13) are provided on the upper surface and the lower surface of the insulating substrate (12).
(13 ') is provided. And
A vertical deflection voltage is applied between the conductors (13) and (13 ') facing each other to deflect the electron beam in the vertical direction. In this embodiment, the electron beam from one line cathode (2) is vertically deflected to a position of 16 lines by a pair of conductors (13) and (13 '). The 16 vertical deflection electrodes (4) form 15 pairs of conductors corresponding to each of the 15 line cathodes (2), and eventually 240 horizontal lines are drawn on the screen (9). Deflect the electron beam to.

Next, the control electrode (5) is composed of a conductive plate (15) each having a slit (14) which is long in the vertical direction, and a plurality of the control electrodes (5) are arranged side by side in the horizontal direction at predetermined intervals. In this example, 180 control electrode conductive plates (15-1) to (15-
n) are provided. (Only 9 are shown in the figure). Each of the control electrodes (5) extracts an electron beam by dividing it horizontally into two picture elements, and controls the passing amount according to a video signal for displaying each picture element. Therefore, the conductive plate (15-
If 1) to (15-n) are provided for 180, 3 per horizontal line
60 picture elements can be displayed. Also, in order to display the image in color, each picture element is to be displayed with a phosphor of three colors R, G, B, and each control electrode (5) has two picture elements of R, G, B.
The respective video signals of are sequentially added. In addition, 180 sets (2 picture elements per set) of video signals for one line 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 the slit (14) of the control electrode (5).
It is composed of a conductive plate (17) having a plurality of (180) slits (16) long in the vertical direction facing each other, and horizontally focuses the electron beam for each picture element divided in the horizontal direction. And make a narrow electron beam.

The horizontal deflection electrode (7) is composed of a plurality of conductive plates (18) (18 ') vertically arranged at positions on both sides of the slit (16).
8) Six levels of horizontal deflection voltage are applied to (18 '),
The electron beam for each picture element is horizontally deflected, and two sets of R, G, and B phosphors are sequentially irradiated on the screen (9) to emit light. The deflection range is the width of two picture elements for each electron beam in this embodiment.

The accelerating electrode (8) is composed of a plurality of conductive plates (19) horizontally provided at the same position as the vertical deflection electrode (4), and the electron beam is applied to the screen (9) with sufficient energy. Accelerate to make it collide.

The screen (9) is constructed by applying a phosphor (20) which is emitted by irradiation of an electron beam to the back surface of the glass plate (21) and adding a metal back layer (not shown). The phosphor (20) is divided into one slit (14) of the control electrode (5), that is, each one is divided in the horizontal direction.
Two pairs of phosphors of three colors of R, G, and B are provided for the electron beam of the book, and are applied in stripes in the vertical direction. In FIG. 4, broken lines drawn on the screen (9) indicate vertical divisions displayed corresponding to the plurality of line cathodes (2), and two-dot chain lines indicate a plurality of control electrodes (5). ) Shows the division in the horizontal direction that is displayed corresponding to each. In one section divided by these both,
As shown in the enlarged view of FIG.
There are R, G, B phosphors (20), each having a width of 16 lines in the vertical direction. The size of one section is, for example,
The horizontal direction is 1 mm and the vertical direction is 9 mm.

It should be noted that, in FIG. 4, the length in the horizontal direction is greatly enlarged with respect to the vertical direction for the sake of clarity.

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

Next, the basic structure of the drive circuit for displaying a television image on this display element and the waveforms of the respective parts will be described with reference to FIG. First, the drive portion for irradiating the screen (9) with the electron beam to cause the raster to emit 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. The back electrode (1) has -V ₁ and the vertical focusing electrodes (3) (3 ') have. Is V ₃ ,
V ₃ ′, V _{6 for} the horizontal focusing electrode (6) and V _{6 for} the accelerating electrode (8)
DC voltage of V ₉ is applied to V ₈ and the screen (9).

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

The vertical deflection drive circuit (40) includes a vertical deflection counter (2
5), a memory (27) for storing the vertical deflection signal, and a digital-analog converter (39) (hereinafter referred to as DA converter). As the input pulse of the vertical deflection drive circuit (40), the vertical synchronizing signal V and the horizontal synchronizing signal H shown in FIG. 7 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 (here, a period of 240H) excluding the vertical blanking period of the vertical cycle, and the count output is supplied to the address of the memory (27). To be done. Data (8 bits in this case) of the vertical deflection signal corresponding to each address is output from the memory (27), and the DA converter (39) shows υ shown in FIG. 7 (FIG. 6 (b) D). , Ν ′ vertical deflection signal. This circuit has a memory address that stores a vertical deflection signal corresponding to each line of 240H, and by storing regular data in the memory every 16H, 16 levels of vertical deflection signal can be obtained. it can.

On the other hand, the line cathode drive circuit (26) uses the vertical synchronizing signal V and the output of the vertical deflection counter (25) to drive the line cathode drive pulse a.
Create ~ o. FIG. 8A shows the relationship between the vertical synchronizing signal V, the horizontal synchronizing signal H, and the lower 5 bits of the vertical deflection counter (25). FIG. 8 (b) shows a method for producing the line cathode drive pulses a'to o'for each 16H using these signals. In Fig. 8, LSB indicates the lowest bit, and (LSB +
1) means one bit higher than the LSB.

The first line cathode drive pulse a'is RS by using the vertical synchronizing signal V and the output (LSB + 4) of the vertical deflection counter (25).
It can be created by a flip-flop or the like, and the line cathode drive pulses b ′ to o ′ are output from a vertical deflection counter (25) (LS) by using a shift register to output the line cathode drive pulse a ′.
It can be obtained by transferring the inverted version of B + 3) as a clock. The drive pulses a'to o'are inverted and set to a low potential only during each pulse period, and are set to a high potential of about 20 V in other periods, and the cathode drive pulse a'is set to a high potential.
~ O (Fig. 6 (b) E), each wire cathode (2a) ~
Added to (2o).

Each of the line cathodes (2a) to (2o) is heated by the current being lengthened during the high potential of the driving pulse a to o, and the driving pulse a
The heating state is maintained so that electrons can be emitted during the low potential period of ~ o. As a result, 15 line cathodes (2a) to (2o)
, Electrons are emitted only during the 16H period in which the low-potential drive pulses a to o are applied. The back electrode (1) and the vertical focusing electrode (3) during the period when a high potential is applied.
Line cathode (2a) rather than the potential at the position of the line cathode (2) determined by the bias voltage applied to
Since the high potential applied to (2o) becomes more positive, no electrons are emitted from the line cathodes (2a) to (2o).
Thus, in the line cathode (2), during the effective vertical scanning period, electrons are sequentially emitted from the upper line cathode (2a) toward the lower line cathode (2o) for 16H periods. The emitted electrons are pushed forward by the back surface voltage (1), pass through the opposing slits (10) of the vertical focusing electrode (3), and are vertically focused to form a flat electron beam. .

Next, the linear cathode drive pulses a to o and the vertical deflection signals υ and υ '
The relationship with and will be described with reference to FIG. FIG. 9A is a waveform diagram of a linear cathode drive pulse, FIG. 9B is a waveform diagram of a vertical deflection signal, and FIG. 9C is a waveform diagram of a horizontal deflection signal.
The vertical deflection signals .upsilon., .Upsilon. 'In FIG. 9 (b) change by 1H for each 16H period of each line cathode pulse a to o in FIG. 9 (a) and change in 16 steps. Both the vertical deflection signals υ and υ ′ have a center voltage of V ₄ , and ν ′ gradually increases and ν ′ gradually decreases, so that they 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, and as a result, the electron beams generated from the respective line cathodes (2a) to (2o). Is deflected in 16 steps in the vertical direction, and as described above, it is 16
It is deflected so that the raster for one line is drawn one line at a time in order from the top.

As a result of the above, electron beams were emitted from the top of the 15 line cathodes (2a) to (2o) for 16H periods in sequence, and each electron beam was sequentially transmitted from the top to the bottom in 15 vertical sections.
By being deflected line by line, the electron beam is vertically deflected by one line on the screen (9) sequentially from the first line at the upper end to the 240th line at the lower end,
A total of 240 lines of raster are drawn.

The electron beam vertically deflected in this way is controlled by the control electrode (5).
And the horizontal focusing electrode (6) are horizontally divided into 180 sections and taken out. FIG. 4 shows one of them. This electron beam is for each section,
The amount of passage is controlled by the control electrode (5), and it is horizontally focused by the horizontal focusing electrode (6) to form one thin electron beam, which is horizontally deflected in six steps by the horizontal deflecting means described below and then screened. (9) The R, G, B phosphors (20) for the two picture elements above are sequentially irradiated. FIG. 5 shows vertical and horizontal divisions. The number of phosphors corresponding to (15-1) to (15-n) of the control electrodes (5) is 2 respectively.
It becomes R, G, B for the picture element, but for convenience of explanation, one picture element is R ₁ , G ₁ , B
Let ₁ and the other be R ₂ , G ₂ and B ₂ .

Next, the horizontal deflection drive circuit (41) comprises a horizontal deflection counter (28) (11 bits), a memory (29) for storing horizontal deflection signals, and a DA converter (38). .
The input pulse of the horizontal deflection drive circuit (41) is synchronized with the vertical synchronizing signal V and the horizontal synchronizing signal H as shown in FIG. 10, and a pulse 6H having a repetition frequency of 6 times the horizontal synchronizing signal H is used.
The horizontal deflection counter (28) is reset by the vertical synchronizing signal V and counts the horizontal 6 times pulse 6H. This horizontal deflection counter (28) has 6 times during 1H and 24 times during 1V.
Counting 0H × 6 / H = 1440 times, this count output is supplied to the address of the memory (29). Data (8 bits in this case) of the horizontal deflection signal corresponding to the address is output from the memory (29), and the DA converter (38) outputs the data h shown in FIG. 10 (FIG. 6 (b) C). , h ′ is converted into a horizontal deflection signal. This circuit has a memory address that stores the horizontal deflection signal corresponding to each of 6 × 240 lines, and by storing 6 pieces of regular data for each line in the memory, a 6-step wave is generated in 1H period. Can be obtained.

The horizontal deflection signal is 'a, both of central voltage is V _7, h is sequentially decreased, h' a pair of horizontal deflection signals h and h that varies six stages as shown in FIG. 10 sequentially increases As they do, they change in opposite directions. These horizontal deflection signals h and h'are applied to the electrodes (18) and (18 ') of the horizontal deflection electrode (7), respectively. As a result, each horizontally divided electron beam is screened (9) during each horizontal period.
R, G, B, R, G, B (R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B ₂ ) phosphors are
It is horizontally deflected so that it is irradiated for 6 periods each. Thus, in the liner testers, the electron beams R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , and B ₂ for each of the 180 horizontal sections are divided into phosphors (2
0) are sequentially irradiated.

Therefore, the electron beam R ₁ , G ₁ ,
By modulating with the video signals of B ₁ , R ₂ , G ₂ and B ₂ ,
Color television images can be displayed on the screen (9).

Next, the modulation control part of the electron beam will be described. First, the composite video signal applied to the television signal input terminal (23) is applied to the color demodulation circuit (30), where the RY and BY color difference signals are demodulated and the GY color difference is detected. The signals are matrix-combined and further combined with the luminance signal Y to output R, G, B primary color signals (hereinafter referred to as R, G, B video signals). The R, G, and B video signals are 180 sets of sample hold circuits (31-1) to (31-
n). Each sample hold circuit (31-1)
~ (31-n) are for R ₁ , G ₁ , B ₁ , R ₂ , G
_It has 6 sample and hold circuits for ₂ and B ₂ . These sample hold outputs are added to the 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 or the like, and in this example, generates a reference clock 6sc that is 6 times the color subcarrier sc and a reference clock 2sc that is 2 times the color subcarrier sc. The reference clock is controlled so as to always have a constant phase with respect to the horizontal synchronizing signal H. The reference clock 2sc is applied to the deflection pulse generation circuit (42) to generate a signal 6H which is six times the horizontal synchronization signal H.
The signal switching pulses r ₁ , g ₁ , b ₁ , r ₂ , g ₂ , b ₂ (H in FIG. 6B) are obtained for each H / 6. On the other hand, reference clock 6
sc is added to the sampling pulse generation circuit (34), where it is delayed by one clock cycle by the shift register, etc., and during the effective horizontal scanning period (about 50 μsec) of the horizontal period (63.5 μsec). 1080 sampling pulses R ₁₁ , G ₁₁ , B ₁₁ , R ₁₂ , G ₁₂ , B ₁₂ , R ₂₁ , G ₂₁ , B ₂₁ , R ₂₂ , G ₂₂ ,
B _{22 to} Rn ₁ , Gn ₁ , Bn ₁ , Rn ₂ , Gn ₂ and Bn ₂ (A in FIG. 6B) are sequentially generated, and then one transfer pulse t is generated. The sampling pulses R _{11 to} Bn ₂ correspond to respective picture elements when one line of the image to be displayed is divided into 360 picture elements in the horizontal direction, and their positions are always constant with respect to the horizontal synchronizing signal H. Controlled to be.

These 1080 sampling pulses R _{11 to} Bn ₂ are 18
Six lines are added to each of 0 sets of sample hold circuits (31-1) to (31-n), so that one line is divided into 180 lines for each sample hold circuit (31-1) to (31-n). At this time, the respective video signals of R ₁ , G ₁ , B ₁ , R ₂ , G ₂ and B ₂ of the respective two picture elements are individually sampled and held.
180 sets of R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B ₂
The video signal is 18 after sample and hold for one line
It is transferred all at once to the 0 sets of memories (32-1) to (32-n) by the transfer pulse t, and is held there for the next one horizontal period. The held signals of R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B ₂ are applied to the switching circuits (35-1) to (35-n).
Each of the switching circuits (35-1) to (35-n)
It is configured by a tri-state or analog gate having individual input terminals of R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B ₂ and a common output terminal for sequentially switching and outputting them.

The output of each switching circuit (35-1) to (35-n) is 18
Zero sets of pulse width modulation (PWM) circuits (37-1) to (37-n)
, Where R ₁ , G ₁ , sampled and held
The reference pulse signal is pulse-width modulated according to the magnitude of the B ₁ , R ₂ , G ₂ , and B ₂ video signals and is output. The repetition cycle of the reference pulse signal is the signal switching pulse r ₁ , g ₁ , b ₁ , r ₂ ,
It is desirable that the pulse width is sufficiently smaller than the pulse widths of g ₂ and b ₂ , and for example, a pulse width of about 1:10 to 1: 100 is used.

The outputs of the pulse width modulation circuits (37-1) to (37-n) are used as control signals for modulating the electron beam, and the 180 conductive plates (15-1) to ( 15-
n) are added individually. Each switching circuit (35-1) ~ (35-n ) switching pulse r ₁ is applied from the switching pulse generation circuit _{(36), g 1, b} 1, r 2,
Switching control is performed simultaneously by g ₂ and b ₂ . The switching pulse generation circuit (36) is the deflection pulse generation circuit (4
It is controlled by the signal switching pulses r ₁ , g ₁ , b ₁ , r ₂ , g ₂ , b ₂ from 2), each horizontal period is divided into 6 and H / 6 switching circuits (35-1) to (35-n) is switched and R ₁ , G ₁ ,
Switching signals r ₁ , g so that the video signals of B ₁ , R ₂ , G ₂ , B ₂ are time-divided and sequentially output and supplied to the pulse width modulation circuits (37-1) to (37-n). ₁ , b ₁ , r ₂ , g ₂ , b ₂ are generated.

What should be noted here is the switching circuit (35-1)
To (35-n), supply switching of video signals of R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B ₂ and electron beams R ₁ , G ₁ , B ₁ by the horizontal deflection drive circuit (41) That is, the horizontal switching of the irradiation switching of R, R ₂ , G ₂ and B _{2 to} the phosphors is synchronously controlled so as to be completely matched in timing and order. Thereby, when the electron beam is irradiated on the R ₁ phosphor, the irradiation amount of the electron beam is controlled by the R ₁ image signal,
G ₁ , B ₁ , R ₂ , G ₂ , B ₂ are controlled in the same way, and
R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B ₂ The emission of each phosphor is R ₁ , G ₁ , B of the picture element.
_The respective picture elements are controlled by the video signals of ₁ , R ₂ , G ₂ , and B ₂ , and each picture element is luminescently displayed according to the input video signal. This control is simultaneously performed for 180 sets of one line (two pixel elements each), 360-pixel image of one line is displayed, and further 240 H lines are sequentially performed from the upper line, and the screen (9 ) One image will be displayed on top.

Then, the various operations as described above are performed by the input television signal 1
This is repeated for each field, and as a result, a moving picture television image is displayed on the screen (9) as in a normal television receiver.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the image display device having the above-described configuration, since the vertical deflection is performed and then the horizontal deflection is performed, the deflection distortion becomes large. In particular, after the maximum vertical deflection is received, the maximum horizontal deflection is performed. Since the aberration received by the beam is large, the beam is not focused on one point, and the beam diameter is larger than the diameter of the phosphor, there is a problem that the saturation is lowered.

The invention solves such a problem, and an object of the invention is to provide an image display device which does not require horizontal deflection.

Means for Solving the Problems In order to solve the above problems, the present invention divides a screen on a screen into a plurality of sections in a vertical direction, and a horizontal method for generating an electron beam for each vertical section. A first vertical deflection electrode having a linear cathode extending in the direction, and vertically deflecting the electron beam generated from the linear cathode for each section, and the vertical deflected electron beam in the horizontal direction. The beam flow control electrode for controlling the electron beam amount, the beam correction electrode for absorbing the beam aberration caused by the first vertical deflection electrode, and the electron beam deflected in the vertical direction are further vertically divided. It has a second vertical deflection electrode for deflecting, and the RGB trio of phosphors on the screen is divided into a plurality of sections in the horizontal direction with respect to the electron beam vertically deflected by the first and second vertical deflection electrodes. Each of them is provided by arranging them in the vertical direction.
It is not necessary that the phosphors of (1) be arranged in a horizontal stripe pattern.

Action With this configuration, the aberration generated in the first vertical deflection having a relatively large deflection angle is reduced by the beam modifying electrode, and thereafter only the vertical deflection is performed. As compared with the case where the deflection is performed in the two directions of the vertical direction and the horizontal direction, the generated aberration is smaller.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. First
The figure illustrates one embodiment. This display element includes a back electrode (51) in order from the rear to the front, and a line cathode (52) vertically arranged as a beam source ((52a)-
(52d) is shown), a first vertical deflection electrode (53) for vertically deflecting the electron beam generated from the linear cathode (52) in each vertical section, the vertically deflected electron beam Is divided into a plurality of parts in the horizontal direction and a beam flow control electrode (54) for controlling the electron beam amount, a beam correction electrode (55) for absorbing the beam aberration due to the first vertical deflection, and a beam deflected in the vertical direction are further added. A second vertical deflection electrode (56) for vertically deflecting and a screen (57) are arranged and housed, and these are housed in a vacuumed inside of a flat gas valve (not shown). .

In the above configuration, in the conventional example, 2 per division in the horizontal direction.
While pixels are displayed, in the present embodiment, only one pixel can be displayed for each horizontal section. Therefore, in order to obtain the same resolution as that of the conventional example, one horizontal section is not displayed. It is halved, and the conductive plate for the control electrode needs to be twice as large as the conventional example. In FIG. 1, in order to make it easier to see, the horizontal direction is shown enlarged in comparison with the conventional example.

Further, in this embodiment, the RGB trio of the phosphor on the screen (57) is in the horizontal direction with respect to the beam flow vertically deflected by the first and second vertical deflection electrodes (53) and (56). Are arranged in the vertical direction for each of the plurality of sections, for example, adjacent trios are vertically offset from each other by 1/2 step.

Next, a method of driving this display element will be described. As shown in FIG. 3, the driving method of each line cathode is exactly the same as that of the conventional example. Therefore, in the line cathode (52), from the upper line cathode (52a) to the lower line cathode (52o) during the effective vertical scanning period. Electrons are sequentially emitted for 16 H periods toward (not shown). The emitted electrons are deflected in 16 steps by 1H by the first vertical deflection electrode (53), modulated by the beam flow control electrode (54) according to the image signal, and changed by the beam correction electrode (55) to the landing position. After being corrected, the voltage υ ₁ , υ ₂ applied to the second vertical deflection electrode (56) deflects the light vertically to three stages during 1H period, thereby changing the R, G, B three-color phosphors. Irradiate.

As another driving method, it is also possible to deflect the electrons emitted from the linear cathode by 8 steps in 2H steps by the first vertical deflection electrode and by 6 steps in the 2H period by the second vertical deflection electrode.

As described above, according to the present invention, since a color image is displayed by deflecting only in the vertical direction, the deflection aberration of the electron beam is small, and an image with high saturation can be obtained uniformly. Moreover, the number of man-hours and the cost can be reduced by reducing the horizontal electrodes.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of an image display element used in the image display device of the present invention, FIG. 2 is a view showing a coating state of a screen phosphor of the image display device, and FIG. FIG. 4 is a waveform diagram for explaining the operation of the apparatus, FIG. 4 is an exploded perspective view of an example image display element used in a conventional image display apparatus,
FIG. 5 is an enlarged view of the phosphor screen of the image display element, FIG. 6 is a block diagram showing the basic configuration of the drive circuit of the image display element and waveform charts of respective parts, and FIG. 7 is an explanation of the operation of the vertical deflection drive circuit. 8 is a waveform diagram for explaining the operation of the line cathode drive circuit, FIG. 9 is a waveform diagram of each drive signal, and FIG. 10 is a waveform diagram for explaining the operation of the horizontal deflection drive circuit. Is. (52) ... Wire cathode, (53) (56) ... Vertical deflection electrode, (54)
… Beam flow control electrode, (55)… Beam modifying electrode, (57)
... screen, (20) ... phosphor, (24) ... sync separation circuit, (26) ... line cathode drive circuit, (30) ... color demodulation circuit,
(40) ... Vertical deflection drive circuit, (42) ... Deflection pulse generation circuit,

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshinobu Sekihara 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Minoru Ueda, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A screen on a screen is vertically divided into a plurality of sections, and each vertical section has a horizontally extended line cathode for generating an electron beam. A first vertical deflection electrode that vertically deflects the generated electron beam for each section, and a beam flow control that controls the electron beam amount while horizontally dividing the vertically deflected electron beam into a plurality of sections. An electrode, a beam modifying electrode that absorbs the beam aberration of the first vertical deflection electrode, and a second vertical deflection electrode that further vertically deflects the electron beam deflected in the vertical direction. An image display device in which a plurality of RGB trios of phosphors on a screen are vertically arranged for each of a plurality of horizontal sections with respect to an electron beam vertically deflected by two vertical deflection electrodes.