JPH0459744B2 - - Google Patents

Description

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

Conventional configurations and their problems Traditionally, cathode ray tubes have been mainly used as display elements for displaying color television images, but conventional cathode ray tubes are extremely long and thin compared to the screen size. It was impossible to create a full-sized television receiver. In addition, 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 yet been put into practical use.

Therefore, in order to achieve a flat display device using electron beams, the present applicant filed a patent application in 1983-
No. 20618 (Japanese Unexamined Patent Publication No. 58-135590) proposed a new display device.

In this method, when the screen is vertically divided into multiple sections, an electron beam is generated for each section, and each electron beam is deflected vertically for each section to display multiple lines. ,
It displays the television image as a whole.

First, a basic configuration example of the image display element used here will be explained with reference to FIG.

This display element is arranged 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, a beam flow control electrode 5, a horizontal focusing electrode 6, a horizontal deflection electrode 7, a beam accelerating electrode 8 and a screen plate 9. and is housed within the evacuated interior of a flat glass bulb (not shown).

A line cathode 2 serving as a beam source is stretched horizontally so as to generate an electron beam distributed linearly in the horizontal direction, and a plurality of line cathodes 2 (here, 2-2-4
(Only books shown) provided. In this embodiment, it is assumed that 15 pieces are provided. 2 of them
Let's say I~2yo. These line cathodes 2 are, for example, 10
It consists of an oxide cathode material for thermionic emission coated on the surface of a tungsten wire with a diameter of ~20μφ.
These line cathodes 2A to 2Y are heated so as to generate a thermionic electron beam by passing an electric current through them, and as will be described later, the electron beams are generated sequentially for a certain period of time starting from the line cathode 2I. controlled to emit. The back electrode 1 generates an electron beam from a line cathode 2 other than the line cathode 2 which is controlled to emit an electron beam for a certain period of time, and directs the electron beam whose generation is suppressed only in the front direction. It has the effect of pushing out toward the target. The back electrode 1 may be formed by a coating of a conductive material applied to the inner surface of the rear wall of the glass bulb. Further, instead of the back electrode 1 and the linear cathode 2, a planar electron beam emitting cathode may be used.

The vertical focusing electrode 3 is a conductive plate 11 having a horizontally long slit 10 facing each of the line cathodes 2I to 2Y, and extracts the electron beam emitted from the line cathode 2 through the slit 10, and focus in a direction. An electron beam for one horizontal line (360 pixels) is extracted at the same time. In the figure, only one horizontal division is shown. The slit 10 may be provided with crosspieces at appropriate intervals in the middle, or may be substantially configured as a slit by a row of through holes arranged horizontally at small intervals (nearly touching intervals). may have been done. The vertical focusing electrode 3' is also similar.

A plurality of vertical deflection electrodes 4 are arranged horizontally in the middle of each of the slits 10, and are each composed of conductors 13 and 13' provided on the upper and lower surfaces of an insulating substrate 12. has been done. And the opposing conductors 13, 13'
A vertical deflection voltage is applied between them to deflect the electron beam in the vertical direction. In this embodiment, the electron beam from one line cathode 2 is vertically deflected to positions corresponding to 16 lines by a pair of conductors 13, 13'. And, by 16 vertical deflection electrodes 4, 15
Fifteen conductor pairs corresponding to each of the book line cathodes 2 are constructed, and the electron beam is ultimately deflected to draw 240 horizontal lines on the screen 9.

Next, the control electrodes 5 are composed of conductive plates 15 each having a vertically long slit 14, and a plurality of control electrodes 15 are arranged in parallel in the horizontal direction at predetermined intervals. In this embodiment, 180 conductive plates 15a to 15n for control electrodes are provided (only nine are shown in the figure). Each of the control electrodes 5 separates and extracts the electron beam into two picture elements in the horizontal direction, and controls the amount of electron beam passing therethrough in accordance with a video signal for displaying each picture element. Therefore, the conductive plates 15a to 15n for the control electrode 5 are
With this provision, it is possible to display 360 pixels per horizontal line. In addition, in order to display images in color, each picture element is displayed using phosphors of three colors R, G, and B, and each control electrode 5 has R, G, and B phosphors for two picture elements.
G and B video signals are sequentially added. 180 again
Each of the conductive plates 15a to 15n for the control electrode 5 has 180 sets (2 pixels per set) for one line.
video signals are applied simultaneously, and one line of video is displayed at one time.

The horizontal focusing electrode 6 is composed of a conductive plate 17 having a plurality of vertically long slits 16 (180 slits 16) facing the slits 14 of the control electrode 5, and collects electrons for each picture element divided in the horizontal direction. Each beam is focused horizontally into a narrow electron beam.

The horizontal deflection electrode 7 is composed of a plurality of conductive plates 18, 18' arranged vertically on both sides of the slit 16, and each electrode 18, 18' has six levels of horizontal deflection. A voltage is applied to horizontally deflect the electron beam for each pixel, and two sets of R,
The G and B phosphors are sequentially irradiated to emit light. In this embodiment, the deflection range is two picture elements wide for each electron beam.

The accelerating electrode 8 is composed of a plurality of conductive plates 19 provided horizontally at the same position as the vertical deflection electrode 4, and accelerates the electron beam so that it collides with the screen 9 with sufficient energy.

The screen 9 is constructed by coating the back surface of a glass plate 21 with a phosphor 20 that emits light when irradiated with an electron beam, and adding a metal back layer (not shown). The phosphor 20 is arranged for each slit 14 of the control electrode 5, that is, for each horizontally divided electron beam.
Two pairs of phosphors in each of the three colors R, G, and B are provided, and are applied in stripes in the vertical direction. The wiring drawn on the screen 9 in FIG. 1 indicates the division in the vertical direction that is displayed corresponding to each of the plurality of line cathodes 2, and the two-dot chain lines correspond to each of the plurality of control electrodes 5. Indicates the horizontal division displayed. As shown in the enlarged view in Figure 2, one section partitioned by these two has R, G, and B phosphors 20 for two pixels in the horizontal direction, and 16 lines in the vertical direction. It has a width of
For example, the size of one section is 1 in the horizontal direction.
mm, and the vertical direction is 10 mm.

Note that in FIG. 1, the length in the horizontal direction is greatly enlarged relative to the length in the vertical direction for clarity.

Furthermore, in this embodiment, only one pair of R, G, and B phosphors 20 for two picture elements are provided for one control electrode 5, that is, for one electron beam. In this case, R, G, and B video signals for one picture element or three picture elements or more are sequentially applied to the control electrode 5, and in synchronization with this, horizontal A deflection is made.

Next, the basic configuration 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.

Power supply circuit 22 A circuit for applying a predetermined bias voltage (operating voltage) to _each electrode of the display element.
DC voltages of V ₃ , V ₃ ', V ₆ to the horizontal focusing electrode 6, V ₈ to the accelerating electrode 8, and V ₉ to the screen 9 are applied.

Next, a composite video signal of a television signal is applied to the input terminal 23, and a synchronization separation circuit 24 separates and extracts a vertical synchronization signal V and a horizontal synchronization signal H.

The vertical deflection drive circuit 40 includes a vertical deflection counter 25, a memory 27 for storing vertical deflection signals, and a digital-to-analog converter 39 (hereinafter referred to as a DA converter). Vertical deflection drive circuit 4
As the zero input pulse, the vertical synchronizing signal V and horizontal synchronizing signal H shown in FIG. 4 are used. The 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 retrace period of vertical synchronization, and this count output is supplied to the address of the memory 27. The memory 27 outputs vertical deflection signal data (here, 8 bits) corresponding to each address, and is converted by the DA converter 39 into vertical deflection signals of V and V' shown in FIG. In this circuit 240H
There is a memory address for storing the vertical deflection signal corresponding to each line of minutes, and by storing regular data in the memory every 16H minutes, it is possible to obtain a 16-step vertical deflection signal.

On the other hand, the line cathode drive circuit 26 receives the vertical synchronization signal V
and the output of the vertical deflection counter 25 to create line cathode drive pulses [I to Y]. FIG. 5a shows the relationship between the vertical synchronizing signal V, the horizontal synchronizing signal H, and the lower five bits of the vertical deflection counter 25. FIG. 5b shows a method of creating line cathode driving pulses [A' to Y'] every 16H using these signals. In Figure 5, LSB indicates the lowest bit, (LSB+1)
means the bit one higher than the LSB.

The first line cathode drive pulse [A'] can be created by an R-S flip-flop using the vertical synchronization signal V and the output (LSB+4) of the vertical deflection counter 25, and the line cathode drive pulse [A'~ y'] uses a shift register to transfer the line cathode drive pulse [a'] to the vertical deflection counter 25.
It can be obtained by using the inverted version of the output (LSB+2) as the clock and transferring it. These driving pulses [A' to YO'] are inverted so that the potential is low only during each pulse period, and the line cathode driving pulses [A to YO'] are set to a high potential of about 20 volts during other periods.
y] and added to each line cathode 2i to 2yo.

Each line cathode 2i~2yo has its driving pulse [i~
During the high potential period of drive pulses [Y], a current is passed to heat it, and the heated state is maintained so that electrons can be emitted during the low potential period of drive pulses [Y]. As a result, each of the 15 line cathodes 2I to 2Y receives a driving pulse [I to YO] at a low potential for 16H.
Electrons are released only during this period. During the period when a high potential is applied, the potential at the line cathode 2 is lower than the potential at the position of the line cathode 2 determined by the bias voltage applied to the back electrode 1 and the vertical focusing electrode 3. Since the applied high potential becomes positive, no electrons are emitted from the line cathodes 2I to 2Y. Thus, in the line cathode 2, electrons are emitted from the upper line cathode 2a toward the lower line cathode 2y every 16H period during the effective vertical scanning period.

The emitted electrons are pushed forward by the back electrode 1, pass through the opposing slits 10 of the vertical focusing electrode 3, and are vertically focused into a flat electron beam.

Next, the relationship between the line cathode drive pulses [I to Y] and the vertical deflection signals v and v' will be explained with reference to FIG. The vertical deflection signals v and v' change by 1H during the 16H period of each line cathode pulse [I to Y], and change in 16 steps. The vertical deflection signals v and v' both have a center voltage of _V4 , and are configured to change in opposite directions so that v increases sequentially and v' decreases sequentially. These vertical deflection signals v and
v′ are electrodes 13 and 13′ of vertical deflection electrode 4, respectively;
As a result, each line cathode 2~
The electron beam generated from 2-Yo is vertically deflected in 16 steps, and as mentioned earlier, on the screen 9, one electron beam draws a raster of 16 lines one line at a time from the top. Deflected.

As a result of the above, an electron beam is emitted for a period of 16 hours from the top of the 15 line cathodes 2A to 2Y, and each electron beam is sequentially emitted for one line from the top to the bottom within 15 sections in the vertical direction. As a result, the electron beam is vertically deflected one line at a time on the screen 9 from the first line at the top end to the 240th line at the bottom end, thereby drawing a raster of 240 lines in total.

The electron beam thus vertically deflected is horizontally deflected by 180 degrees by the control electrode 5 and the horizontal focusing electrode 6.
It is divided into sections and taken out. Figure 1 shows one of these categories. The amount of electron beam passing through each section is controlled by a control electrode 5, and horizontally focused by a horizontal focusing electrode 6 into a single narrow electron beam, which is then controlled by horizontal deflection means described below. The light is then deflected in six steps in the horizontal direction and is sequentially irradiated onto each of the R, G, and B phosphors 20 corresponding to two picture elements on the screen 9. FIG. 2 shows the vertical and horizontal divisions. The phosphors corresponding to 15a to 15n of the control electrode 5 are R, G, and B for two picture elements, but for convenience of explanation, one picture element is R ₁ ,
Let G ₁ and B ₁ be R ₂ , G ₂ , and B ₂ .

Next, the horizontal deflection drive circuit 41 is composed of a horizontal deflection counter (11 bits), a memory 29 storing horizontal deflection signals, and a DA converter 38. The input pulse to the horizontal deflection drive circuit 41 is synchronized with the vertical synchronizing signal V and the horizontal synchronizing signal H, as shown in FIG. 7, and uses a pulse 6H having a repetition frequency six times that of the horizontal synchronizing signal H.

The horizontal deflection counter 28 is reset by the vertical synchronizing signal V and counts horizontal six times pulses 6H. This horizontal deflection counter 28 is
6 times during 1H, 240H x 6/H = 1440 during 1V
The count output is supplied to an address in the memory 29. The address is supplied from the memory 29. From the memory 29, horizontal deflection signal data according to the address (8 bits in this case)
is output and converted by the DA converter 38 into horizontal deflection signals such as h and h' shown in FIG. This circuit has memory addresses that store horizontal deflection signals corresponding to each of 6 x 240 lines.
By storing six pieces of regular data in the memory for each line, a horizontal deflection signal with six step waves can be obtained in a 1H period.

This horizontal deflection signal is a pair of horizontal deflection signals h and h' that change in 6 steps as shown in FIG. 7, both have a center voltage of V ₇ , and h gradually decreases.
h' increases in sequence and changes in opposite directions. These horizontal deflection signals h, h' are applied to electrodes 18 and 18' of the horizontal deflection electrode 7, respectively.
As a result, each horizontally divided electron beam is transmitted to the R, G, B,
It is horizontally deflected so that R, G, and B (R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B ₂ ) phosphors are sequentially irradiated with H/6 each. Thus, in each line raster, the electron beam is R ₁ ,
Each phosphor 20 of G ₁ , B ₁ , R ₂ , G ₂ , and B ₂ is sequentially irradiated with light.

Therefore, an electron beam is applied to each horizontal section of each line.
A color television image can be displayed on the screen 9 by modulating the video signals R ₁ , G ₁ , B ₁ , R _{2 ,} G ₂ , and B 2 .

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,
Here, the color difference signals of R-Y and B-Y are demodulated,
The G-Y color difference signals are matrix-synthesized, and further, they are combined with the luminance signal Y to generate R, G,
B primary color signals (hereinafter referred to as R, G, and B video signals) are output. Each of these R, G, and B video signals are processed by 180 sample and hold circuit sets 31a to 3.
Added to 1n. Each sample hold circuit group 3
1a to 31n are for R ₁ , G ₁ , B ₁ , R ₂ respectively
It has 6 sample and hold circuits for G, _G2 , and _B2 . These sample and hold outputs are respectively applied to holding memory sets 32a-32n.

On the other hand, the reference clock oscillator 33 is constituted by a PLL (phase locked loop) circuit, etc., and in this embodiment generates a reference clock 6f _sc that is six times the color subcarrier f _sc and a reference clock 2f _{sc that} is twice the color subcarrier f sc. . The reference clock is controlled to always have a constant phase with respect to the horizontal synchronizing signal H. The reference clock _2fsc is added to the deflection pulse generation circuit 42, and is a signal six times as large as the horizontal synchronizing signal H.
Signal switching pulses r ₁ , b ₁ , r ₂ , g ₂ , b ₂ are obtained for each 6H and H/6. On the other hand, the reference clock 6f _sc is applied to the sampling pulse generation circuit 34, where it is delayed by one clock cycle by a shift register, and is thus applied for an effective horizontal scanning period (approximately 50 μsec) of the horizontal period (63.5 μsec). 1080 sampling pulses R _a1 to B _o2 are sequentially generated, and then one transfer pulse t is generated. These sampling pulses R _a1 to B _o2 correspond to each picture element when one line of the video 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 so that

These 1080 sampling pulses R _a1 to B _o2 are each connected to 180 sample and hold circuit sets 31a.
31n, and as a result, R ₁ , G ₁ , B ₁ , R for each two picture elements when one line is divided into 180 are added to each sample-and-hold circuit group 31a to 31n. ₂ , _G2 , and _B2 are individually sampled and held. The held video signals of 180 pairs of R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B ₂ will be processed after one line of sample and hold is completed.
The signals are transferred all at once to 180 sets of memories 32a to 32n by a transfer pulse t, where they are held for the next horizontal period. This retained R ₁ , G ₁ , B ₁ , R ₂ ,
G ₂ and B ₂ signals are sent to switching circuits 35a to 35
added to n. Switching circuits 35a-35
n is composed of a tri-state or analog gate, each having individual input terminals for R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , and B ₂ and a common output terminal for sequentially switching and outputting them. be.

The output of each switching circuit 35a to 35n is
180 sets of pulse width modulation (PWM) circuits 37a to 3
7n and sample held here
The reference pulse signal is pulse width modulated according to the magnitude of the R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B ₂ video signal and is output. It is desirable that the repetition period of the reference pulse signal is sufficiently smaller than the pulse width of the signal switching pulses r ₁ , g ₁ , b ₁ , r ₂ , g ₂ , b ₂ , for example, 1:10 to 1:10. A ratio of about 1:100 is used.

The output of the pulse width modulation circuits 37a to 37n is used as a control signal for modulating the electron beam to the 180 conductive plates 15a to 15 of the control electrode 5 of the display element.
n separately. Each of the switching circuits 35a to 35n receives a switching pulse r ₁ , which is applied from the switching pulse generation circuit 36.
Switching is controlled simultaneously by g ₁ , b ₁ , r ₂ , g ₂ , and b ₂ . The switching pulse generation circuit 36 generates a signal switching pulse from the deflection pulse generation circuit 42 mentioned above.
It is controlled by r ₁ , g ₁ , b ₁ , r ₂ , g ₂ , b ₂ ,
Each horizontal period is divided into 6 and the switching circuits 35a to 35n are switched by H/6, and R ₁ , G ₁ , B ₁ ,
Switching signals r _{1 ,} g ₁ , b _{1 ,} r ₂ , g _{2 ,} b Generate ₂ .

What should be noted here is that the switching circuit 3
R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B ₂ in 5a to 35n
video signal supply switching and horizontal deflection drive circuit 4
The irradiation switching horizontal deflection of the electron beams R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B ₂ to the phosphor according to No. 1 is synchronously controlled so that they completely match both in timing and order. It is that you are. As a result, when the electron beam is irradiating the R ₁ phosphor, the irradiation amount of the electron beam is controlled by the R ₁ video signal, and also for G ₁ , B ₁ , R ₂ , G ₂ , and B ₂ . Similarly controlled, R, G, B, R ₂ , G ₂ ,
B ₂ The emission of each phosphor is caused by the R ₁ , G ₁ , B ₁ ,
Each picture element is controlled by the R ₂ , G ₂ , and B ₂ video signals, and each picture element is displayed by emitting light according to the input video signal. Such control is performed simultaneously for 180 sets of one line (2 picture elements each) to display an image of 360 picture elements for one line, and then sequentially for 240 minutes of lines starting from the upper line. One image will be displayed.

The above operations are repeated for each field of the input television signal, and as a result,
Screen 9 is the same as a normal television receiver.
The television footage of the video is shown above.

By the way, in the image display device as described above, it is extremely difficult to assemble the pair of horizontal deflection electrodes located on both sides of each slit 16 of the horizontal focusing electrode 6 as designed, and in reality, assembly errors occur. In this case, in a certain horizontal section as shown on the left side of FIG.
Although the electron beam collides with the B phosphor one after another, in other horizontal sections, as shown on the right side of Figure 8, the electron beam does not exactly collide with a predetermined phosphor, but hits other parts or other phosphors. The problem arises of a collision.

Here, it is possible to change the deflection amount of the electron beam by controlling the horizontal deflection voltage, but in this case, since the horizontal deflection voltage is commonly applied to all horizontal deflection electrodes, some The disadvantage is that the correction of the horizontal section conversely causes illumination errors in other originally accurate horizontal sections.

Purpose of the Invention In view of the above-mentioned problems, the present invention provides an image display capable of accurately colliding an electron beam with a phosphor over the entire horizontal range even if there is an assembly error in the image display element. The purpose is to provide equipment.

Structure of the Invention In the present invention, a large number of pairs of horizontal deflection electrodes installed across the electron beam path in each horizontal section are divided into n groups (n = an integer of 2 or more), and each of the divided horizontal By applying a horizontal deflection signal independently to each group of deflection electrodes, it is possible to correct the horizontal deflection for each group, making it possible to perform accurate horizontal deflection operations over the entire horizontal range. It is something.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 9 to 11. FIG. 9 shows an example in which a large number of horizontal deflection electrode pairs are divided into two. Further, FIG. 10 shows its driving circuit.

In FIG. 9, 18a and 18a' are a pair of horizontal deflection electrodes, and 18b and 18b' are the horizontal deflection electrodes 1.
8a, 18a' are a pair of horizontal deflection electrodes arranged independently, one horizontal deflection electrode 8a,
A step-like horizontal deflection signal that gradually decreases is applied to the other horizontal deflection electrodes 18a' and 18b.
A horizontal deflection signal which increases in reverse order is added to b′.

In FIG. 10, 38 and 38' are digital signals that convert the digital horizontal deflection signal sent from the horizontal deflection processing circuit of FIG. 3 into an analog signal.
Analog (D/A) converter, 41a, 41a'41
b, 41b' are horizontal deflection output circuits, and a D/A converter 38 is connected to the horizontal deflection output circuits 41a, 41b.
horizontal deflection output circuits 41a', 41
The output of the D/A converter 38' is added to b'. And horizontal deflection output circuits 41a, 41
Horizontal deflection signals changing in opposite directions from a' are applied to the horizontal deflection electrodes 18a, 18a', and horizontal deflection signals changing in opposite directions from the horizontal deflection output circuits 41b, 41b' are applied to the horizontal deflection electrodes 18b, 18b'. Add to.

Furthermore, the horizontal deflection output circuits 41a, 41
A DC voltage control circuit 43 is provided for a', and a DC voltage control circuit 43' is provided for the horizontal deflection output circuits 41b and 41b'. This DC voltage control circuit 43,
By changing the DC bias current (V ₇ in Figure 3) at 43', the potential between the horizontal deflection signals h and h' that change in opposite directions as shown in Figure 11a and b is changed to C'V. _pp , D′V _pp , horizontal deflection output circuits 41a, 41a′,
Further, since the horizontal deflection output circuits 41b and 41b' can each be independently adjusted, the horizontal deflection signal can be output independently between the pair of horizontal deflection electrodes 18a and 18a' between the pair of horizontal deflection electrodes 18b and 18b'. Amplitude adjustment can be performed. Therefore, accurate horizontal deflection correction can be achieved over the entire horizontal range. In FIG. 10, 44 and 44' are gain control circuits, respectively.

Further, in the above embodiment, the case where the horizontal deflection electrode is divided into two has been described, but the invention is not limited to this, and may be divided into three or four, for example.

Effects of the Invention As described above, according to the present invention, even if an assembly error occurs in the horizontal deflection electrode, it can be mechanically and electrically compensated for and accurate horizontal deflection can be performed over the entire horizontal range. The electron beam can be caused to collide with a predetermined phosphor.

[Brief explanation of the drawing]

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, and FIG.
The figure is an enlarged view of the fluorescent surface of the image display element, FIG. 3 is a block diagram of a drive circuit devised prior to the present invention to drive the image display element, and FIGS. 6 and 7 are waveform diagrams of various parts to explain the operation of the drive circuit, respectively, and FIG. 8 is a schematic diagram to explain the operation of the conventional image display device.
FIG. 9 is a front view of a main part of an image display element used in an image display device according to an embodiment of the present invention, FIG. 10 is a block diagram of a main part of a drive circuit used in the same device, and FIG.
FIG. 1 is a waveform diagram of each part for explaining the operation of the same drive circuit. 2, 2 I to 2 Y... Line cathode, 4... Vertical deflection electrode, 5... Beam flow control electrode, 7... Horizontal deflection electrode, 9... Screen plate, 10... Slit, 1
4... Slit, 15, 15a-15n... Conductive plate, 18a, 18a', 18b, 18b'... Conductive plate, 20... Fluorescent material, 23... Input terminal, 24...
... Synchronous separation circuit, 25 ... Vertical deflection counter, 26 ... Line cathode drive circuit, 27 ... Memory,
28...Horizontal deflection counter, 29...Memory, 30...Color demodulation circuit, 31a to 31n...Sample hold circuit, 32a to 32n...Memory, 33...Reference clock oscillator, 34...Sampling pulse generation circuit , 35a-35n... switching circuit, 36... switching pulse generation circuit, 37a-37n... PWM circuit, 38,
38'...D/A converter, 39...D/A conversion circuit, 40...Vertical deflection drive circuit, 41a, 41
a', 41b, 41b'...Horizontal deflection output circuit, 42
... Deflection pulse generation circuit, 43, 43'... DC voltage control circuit, 44, 44'... Gain control circuit.

[Claims]

1. A rotating shaft rotatably supporting an anode target, a fixed cylinder coaxially arranged around the rotating shaft, and a pair of bearings arranged axially apart between the rotating shaft and the fixed cylinder. , a rotating anode type
A rotary anode type X-ray tube, characterized in that a portion of the fixed cylinder in contact with an outer ring of a bearing to which the preload is applied is formed of ceramic. 2 The above ceramics are BN, B ₄ C, Si ₃ N ₄ , SiC
The rotating anode type X-ray tube according to claim 1, which contains one of these as a main component.

Claims (1)

An image display device that adds a signal for horizontal deflection.