JPH0746576B2 - Image display device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to generate an electron beam for each section when a screen on a screen is divided into a plurality of sections in the vertical direction, and to generate an electron beam for each section. The present invention relates to a device for deflecting a beam in a vertical direction to display a plurality of lines and displaying a television image as a whole.

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.

Therefore, the applicant of the present invention discloses a flat panel display device using an electron beam, which is disclosed in Japanese Patent Application No. 56-20618.
-135590) proposed a new display device.

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 configuration 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 '), a vertical deflection electrode (4), and a beam current control in order from the rear to the front. An electrode (5), a horizontal focusing electrode (6), a horizontal deflection electrode (7), a beam accelerating electrode (8) and a screen (9) are arranged and configured, and these are flat glass bulbs (not shown). It is housed inside the vacuumed inside. 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 '). Then, the 16 vertical deflection electrodes (4) form 15 pairs of conductors corresponding to the 15 line cathodes (2), respectively.
The electron beam is deflected so as to draw the horizontal line of the book.

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) has a horizontal electron beam 2
The picture element is divided into picture elements and taken out, and the amount of passage is controlled according to a video signal for displaying each picture element. Therefore, the conductive plates (15-1) to (15-
By providing 180 n), 360 picture elements can be displayed per horizontal line. Also, in order to display the image in color, each picture element is to be displayed with a phosphor of three colors of 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, each of the 180 conductive plates (15-1) to (15-n) for the control electrode (5) corresponds to one line.
Video signals of 180 sets (2 picture elements per set) are added at the same time, and 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. 5, the broken lines drawn on the screen (9) indicate vertical divisions displayed corresponding to the plurality of line cathodes (2), and the two-dot chain line indicates the 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. 5, the length in the horizontal direction is greatly enlarged with respect to the vertical direction for the sake of clarity.

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

Next, the basic configuration of the drive circuit for displaying a television image on this display element and the waveforms of each part 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} horizontal focusing electrode (6), V for accelerating electrode (8)
_8. Apply DC voltage of V ₉ to 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. 8 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) outputs υ shown in FIG. 8 (FIG. 7 (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. 9A 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. 9 (b) shows a method of using these signals to generate the line cathode drive pulses a'to o'for each 16H. In Fig. 9, 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. 7 (b) E), each line 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 electrode (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. 10 (a) is a waveform diagram of a linear cathode drive pulse, FIG. 10 (b) is a waveform diagram of a vertical deflection signal, and FIG. 10 (c) is a waveform diagram of a horizontal deflection signal.
The vertical deflection signals .upsilon., .Upsilon. 'In FIG. 10 (b) change in 1H increments by 16 during the 16H period of each of the line cathode pulses a to o in FIG. 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. 5 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. 6 shows vertical and horizontal divisions. The phosphors corresponding to (15-1) and (15-n) of the control electrodes (5) are R, G, and B for two picture elements, but for convenience of explanation, one picture element is defined as R ₁ , G ₁ , B ₁
And the other is R ₂ , G ₂ and B ₂ .

Next, the horizontal deflection drive circuit (41) comprises a horizontal deflection counter (25) (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. 11, 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 h as shown in FIG. 11 (FIG. 7 (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. 11 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, BR, G, B (R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B ₂ ) phosphors in order of H / 6
It is horizontally deflected so that it is irradiated for each period. Thus,
In the raster of each line, each phosphor of the electron beam R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B ₂ in each of 180 horizontal sections (20)
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. 7B) 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. 7B) 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 180 conductive plates (15-1) to (of the control electrodes (5) of the display element (15-1) to ( 15-n) are added individually. Each switching circuit (35-
1) to (35-n) are switching pulse generation circuits (36)
Switching pulses applied from r ₁ ,, g ₁ ,, b ₁ ,, r ₂ ,, g ₂ , b ₂
Are simultaneously switched and controlled. The switching pulse generation circuit (36) is controlled by the signal switching pulses r ₁ , g ₁ , b ₁ , r ₂ , g ₂ , b ₂ from the deflection pulse generation circuit (42) described above, and each horizontal period is Divide into 6 and switch the switching circuits (35-1) to (35-n) by H / 6, R ₁ , G ₁ , B ₁ , R ₂ ,
Switching signals r ₁ , g ₁ , b ₁ , r so that the video signals of G ₂ and B ₂ are time-divisionally sequentially output and supplied to the pulse width modulation circuits (37-1) to (37-n). 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 imager.

Problems to be Solved by the Invention In the image display device shown in the above-mentioned conventional example, the horizontal focus is difficult to squeeze, and labor is required to process the horizontal deflection electrode. Moreover, a high voltage is applied to the horizontal deflection electrode, and the power consumption in the drive circuit is large.

The present invention solves such a problem, and an object thereof is to provide an image display device capable of omitting horizontal deflection.

Means for Solving the Problems In order to solve this problem, the present invention provides a plurality of linear cathode electron beam generation sources and a phosphor that emits light for each electron beam when the electron beams are irradiated. Is applied in the form of a stripe in the horizontal direction, a vertical focusing electrode for vertically focusing the electron beam generated by the electron beam generation source, and the vertical focused electron beam to the screen. And a deflection electrode for vertically deflecting the vertically deflected electron beam and the vertically deflected electron beam are divided and taken out for each picture element in the horizontal direction, and the amount of irradiation of the element beam on the screen is controlled to control the emission intensity. An electrode and a horizontal focusing electrode that horizontally focuses the electron beams of the respective picture elements divided horizontally by the control electrode into a narrow electron beam , Which displays an image by irradiating an electron beam to the vertically divided areas corresponding to the above-mentioned multiple line cathodes on the screen, in particular, R, G, B three-color phosphor is horizontal. It is applied in a stripe shape in the direction, and the horizontal deflection electrode is omitted.

As described above, the R, G, and B three-color phosphors are horizontally applied in stripes, and the number of electrodes is fixed so that one pixel corresponds to each beam flow control electrode. In addition, a drive circuit is not necessary, and fine adjustment of horizontal focus is not necessary. In addition, the sampling frequency of the picture element can be fixed, and a circuit that can be used regardless of the number of inches becomes possible.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, the display elements are, in order from the rear to the front, a back electrode (51), a line cathode (52) as a beam source,
Vertical focusing electrodes (53) (53 '), vertical deflection electrodes (54), beam flow control electrodes (55), horizontal focusing electrodes (56), beam accelerating electrodes (58) and screen plates (59) are arranged. These are housed inside the evacuated interior of a flat glass bulb (not shown). A line cathode (52) 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 (52) are vertically arranged at appropriate intervals. Books (only four (52a) to (52d) are shown here) are provided. The back electrode (51) suppresses the generation of the electron beam from the other line cathodes (52) other than the line cathode (52) which is controlled to emit the electron beam for a certain period of time, and controls the generated electron beam in front. It works by pushing it only in the direction.

The vertical focusing electrode (52) is a conductive plate (61) having a horizontally long slit (60) facing each of the line cathodes (52).
The electron beam emitted from the linear cathode (52) is taken out through the slit (60) and focused in the vertical direction, and the electron beam for one horizontal line is taken out at the same time. The vertical focusing electrode (53 ') is similar.

A plurality of vertical deflection electrodes (54) are arranged horizontally in the middle of each of the slits (60), and conductors (63) are provided on the upper surface and the lower surface of the insulating substrate (62).
(63 ') is provided. And
A vertical deflection voltage is applied between the conductors (63) (63 ') facing each other to deflect the electron beam in the vertical direction.

The beam flow control electrode (55) is composed of a conductive plate (65) each having a vertically long slit (64),
A plurality of pieces are arranged side by side in the horizontal direction at predetermined intervals. Each of the control electrodes (55) separates and takes out the electron beam for each picture element, and controls the passing amount according to a video signal for displaying each picture element. Also, in order to display the image in color, each pixel is to be displayed with a phosphor of three colors R, G, B, and each control electrode (55) has one pixel for R, G, B. The respective video signals of are sequentially added. Further, a video signal for one line is simultaneously applied to each of the conductive plates (65) for the control electrode (55), and a video for one line is displayed at one time.

The horizontal focusing electrode (56) is the slit (64) of the control electrode (55).
It consists of a conductive plate (67) that has a plurality of vertically long slits (66) facing each other, and horizontally focuses the electron beams of each picture element divided in the horizontal direction to form thin electrons. Turn it into a beam.

The accelerating electrode (58) is composed of a plurality of conductive plates (69) horizontally arranged at the same position as the vertical deflection electrode (54), and the electron beam is directed to the screen (59) with sufficient energy. Accelerate to make it collide.

The screen (59) is configured by applying a phosphor (70) which is emitted by irradiation of an electron beam to the back surface of the glass plate (71) and adding a metal back layer (not shown). The phosphor (70) is divided into one slit (64) of the control electrode (55), that is, each one is divided in the horizontal direction.
One phosphor is provided for the electron beam of the book,
The R, G, and B three-color phosphors are applied horizontally in stripes in a 480-trio coating. In Fig. 1, the solid lines drawn on the screen (59) indicate the vertical divisions displayed corresponding to each of the 15 line cathodes (52), and the dashed line indicates the 360 control electrodes (55). The division in the horizontal direction displayed corresponding to each is shown. There is one picture element phosphor in the horizontal direction and 32 R, G, B trios in the vertical direction in one section divided by these. This is shown in FIG.

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 in an enlarged scale by 2 times as compared with the conventional example.

Next, the basic structure of a drive circuit for displaying a television image on this display element will be described with reference to FIG. In the circuit of the conventional example, the vertical deflection was 16 stages during the 16H period. However, in order to display a television image on this display element, vertical deflection of 3 stages is required in the period of 1H, that is, 48 stages of 16H are required. FIG. 4 shows the waveform of the vertical deflection signal at this time. This vertical deflection signal is obtained by counting a 3H signal obtained by dividing a 6H pulse conventionally used for horizontal deflection by 2 by a modulator (80) with a vertical deflection counter (25). Also,
Since the beam flow control electrode corresponds to one set of R, G, B picture elements, only one set of R, G, B picture elements need be sample-held or stored in a memory. The circuits other than these are the same as the conventional circuits, and are shown by the same signals.

EFFECTS OF THE INVENTION According to the present invention, the horizontal deflection electrodes can be eliminated by applying the R, G, and B three-color phosphors in the stripe shape in the horizontal direction, thereby eliminating the need for the horizontal deflection electrode drive circuit. It can save labor and reduce cost. Also, a circuit independent of the number of inches can be formed. The image quality deteriorates in low inches, but there is no problem in high inches of 20 inches or more.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an image display element used in an image display device according to an embodiment of the present invention, FIG. 2 is an enlarged view of a fluorescent screen of the image display device, and FIG. 3 is a drive of the image display device. FIG. 4 is a block diagram of the circuit and waveforms of respective parts, FIG. 4 is a waveform diagram of a vertical deflection signal, FIG. 5 is an exploded perspective view of an image display element used in an image display device in a conventional example, and FIG. 6 is the same image display element. FIG. 7 is an enlarged view of the fluorescent screen of FIG. 7, FIG. 7 is a block diagram of a drive circuit for driving the image display device, and waveform diagrams of respective parts, and FIGS. 8 to 11 are diagrams for explaining the operation of the drive circuit. It is a waveform diagram of each part. (52) (52a) to (52o) ... Wire cathode, (53) (53 ') ... Vertical concentrated electrode, (54) ... Vertical deflection electrode, (55) ... Beam flow control electrode, (56) ... Horizontal focusing electrode , (58) ... beam acceleration electrode, (59) ... screen, (60) ... slit, (70)
… Phosphor, (80)… Divider circuit, (24)… Synchronous separation circuit,
(25) ... vertical deflection counter, (26) ... line cathode drive circuit, (27) ... memory, (30) ... color demodulation circuit, (33) ... reference clock oscillator, (39) ... D / A converter, (40) ... Vertical deflection drive circuit, (42) ... Deflection panel generation circuit,

Claims (1)

[Claims] 1. A plurality of linear cathode electron beam generators, a screen on which phosphors that emit light to the respective electron beams when irradiated with the electron beams are horizontally applied in stripes, and the electrons. A vertical focusing electrode for vertically focusing the electron beam generated by the beam source,
A deflection electrode for vertically deflecting the electron beam focused in the vertical direction until reaching the screen and a vertically deflected electron beam for each pixel are extracted in the horizontal direction, and the electron beam A control electrode that controls the amount of light emitted to the screen to control the emission intensity, and a horizontal electron beam that focuses each electron beam of each pixel divided horizontally by the control electrode into a narrow electron beam. An image display device having a focusing electrode, wherein an image is displayed by irradiating an electron beam on vertically divided areas corresponding to the plurality of line cathodes on the screen.