JPH0262995B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention generates an electron beam for each division when an image 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. 135590/1983) proposed a new display device.

This method generates an electron beam for each section when the screen is vertically divided into multiple sections, and displays multiple lines by deflecting each electron beam vertically for each section. However, it displays 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 includes, 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 are arranged, and these are housed in the vacuumed 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. Only four (2a to 2d are shown) are provided. In this example 15
This book shall be provided. 2a~2 them
o. These line cathodes 2 are, for example, 10~
It consists of an oxide cathode material for thermionic emission coated on the surface of a 20 μφ tungsten wire. These line cathodes 2a to 2o are heated so as to generate a thermionic beam when a current is passed through them, and as will be described later, the line cathodes 2a to 2o are
The electron beams are controlled to be emitted sequentially from a for a fixed period of time. The back electrode 1 suppresses generation of electron beams from line cathodes other than the line cathode controlled to emit electron beams for a certain period of time, and pushes out the generated electron beams only in the forward direction. act. 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 2a to 2o. Focus. An electron beam for one horizontal line (360 pixels) is extracted at the same time. In the figure, only one section in the horizontal direction 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 many through holes arranged horizontally at small intervals (nearly touching intervals). may be done. 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'. The 16 vertical deflection electrodes 4 constitute 15 pairs of conductors corresponding to each of the 15 line cathodes 2, and in the end, the electron beams are emitted so as to draw 240 horizontal lines on the screen 9. deflect.

Next, the control electrodes 5 are composed of conductive plates 15 each having a vertically long slit 14, and a plurality of control electrodes 5 are arranged in parallel in the horizontal direction at a predetermined interval. In this embodiment, 180 control electrode conductive plates 15-1 to 15-n are provided (only nine are shown in the figure). Each of the control electrodes 5 extracts the electron beam by dividing it 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 15-1 to 15-n for the control electrode 5 are
If 180 lines are provided, 360 pixels can be displayed 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 each of the R, G, and B colors corresponding to two picture elements. Video signals are added sequentially. In addition, 180 conductive plates 15-1 to 15 for control electrodes 5
-n, 180 sets of video signals for one line (two picture elements per set) are simultaneously applied, and the video for one line 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 made up 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 picture element, and on the screen plate 9 two sets of R,
The G and B phosphors are sequentially irradiated to emit light. In this embodiment, this 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 has R,
Two pairs of three-color phosphors, G and B, are provided and are applied in stripes in the vertical direction.
In FIG. 1, the broken lines drawn on the screen 9 indicate divisions in the vertical direction that are 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.
For example, the size of one section is 1 in the horizontal direction.
mm, and the vertical direction is 9 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.

Further, 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, one electron beam, but of course, one picture element Alternatively, three or more picture elements may be provided. In that case, R, G, and B video signals for one picture element or three or more picture elements are sequentially applied to the control electrode 5, and the horizontal deflection is synchronously applied to the control electrode 5. It will be done.

Next, the basic configuration and waveforms of each part of a drive circuit for displaying television images on this display element will be explained with reference to FIG. First, a driving portion for irradiating the screen 9 with an electron beam to emit raster light will be described.

The power supply circuit 22 is a circuit for applying a predetermined bias voltage (operating voltage) to each electrode of the display element,
-V ₁ to the back electrode 1, and -V 1 to the vertical focusing electrodes 3 and 3'.
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 the vertical period, and this count output is supplied to the address of the memory 27. The memory 27 outputs vertical deflection signal data (here 10 bits) corresponding to each address, and the D-A converter 39 converts the vertical deflection signals v and v' shown in FIG. 4 (FIG. 3 bD). is converted to This circuit has memory addresses that store vertical deflection signals corresponding to each line for 240H.
By storing regular data in the memory every 16 hours, a 16-step vertical deflection signal can be obtained.

On the other hand, the line cathode drive circuit 26 uses the vertical deflection signal V and the output of the vertical deflection counter 25 to create line cathode drive pulses a to o. 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 drive pulses a' to o' every 16H using these signals. In FIG. 5, LSB indicates the lowest bit, and (LSB+1) means the bit one higher than the LSB. The first line cathode drive pulse a' is the vertical synchronization signal V and the vertical deflection counter 25.
The line cathode drive pulses b' to o' can be generated using a shift register, and the line cathode drive pulse a' is output from the vertical deflection counter 25. It can be obtained by using the inverted version of (LSB+3) as the clock and transferring it. These drive pulses a' to o' are inverted and set to a low potential only during each pulse period, and converted into line cathode drive pulses a to o, which are set to a high potential of approximately 20 volts during other periods (the third
Figure bE), added to each wire cathode 2a-2o.

Each of the linear cathodes 2a to 2o is heated by passing a current during the high potential periods of the drive pulses a to o, and the heated state is maintained so that electrons can be emitted during the low potential periods of the drive pulses a to o. Ru. As a result, electrons are emitted from the 15 linear cathodes 2a to 2o only during the 16H period when low potential drive pulses a to o are applied to each of them. During the period when a high potential is applied, the potential applied to the line cathodes 2a to 2o is higher 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 higher potential is positive, no electrons are emitted from the line cathodes 2a to 2o. Thus, in the line cathode 2, electrons are sequentially emitted from the upper line cathode 2a toward the lower line cathode 20 for each 16H period during the effective vertical scanning period. The emitted electrons are pushed forward by the back electrode 1, and the emitted electrons are pushed forward by the back electrode 1, and the slits 1 facing each other in the vertical focusing electrode 3
0 and is focused in the vertical direction to form a flat electron beam.

Next, the relationship between the line cathode drive pulses a to o and the vertical deflection signals v and v' will be explained using FIG. 6. The vertical deflection signals v, v' are each line cathode pulse a to o.
During the 16H period, it changes by 1H 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 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 are vertically deflected in 16 steps. As mentioned above, on the screen 9, one electron beam is deflected so as to sequentially draw a raster line of 16 lines one line at a time from the top.

As a result of the above, electron beams are emitted for a period of 16 hours from the top of the 15 line cathodes 2a to 2o, and each electron beam is deflected by one line from top to bottom within 15 vertical divisions. 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, and a total of 240 raster lines are drawn.

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 for two picture elements on the screen 9. FIG. 2 shows the vertical and horizontal divisions. The phosphors corresponding to 15-1 to 15-n of the control electrode 5 are R, G, and B for two picture elements, but for convenience of explanation, one picture element is R ₁ , G ₁ , and B _{1 and the other is R 1 , G 1 , and B 1} . Let R ₂ , G ₂ , and B ₂ .

Next, the horizontal deflection drive circuit 41 is composed of a horizontal deflection counter 28 (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 the pulse 6H. This horizontal deflection counter 28 counts 6 times during 1H and 240H×6/H=1440 times during 1V, and this count output is supplied to the address of the memory 29.
The memory 29 outputs horizontal deflection signal data (here, 8 bits) according to the address, and the D-
In the A converter 38, h shown in FIG. 7 (FIG. 3 bC),
It is converted into a horizontal deflection signal such as h′. This circuit has memory addresses for storing horizontal deflection signals corresponding to each of 6 x 240 lines, and by storing 6 pieces of regular data for each line in the memory, 6 step waves are generated in 1H period. horizontal deflection signals can be obtained.

This horizontal deflection signal is a pair of horizontal deflection signals h and h' that change in six steps as shown in FIG. 7, both have a center voltage of _V7 , and h decreases sequentially.
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 television signal input terminal 23
The composite video signal applied to Y is synthesized,
R, G, and B primary color signals (hereinafter referred to as R, G, and B video signals) are output. These R, G, and B video signals are processed by 180 sample and hold circuits 31-
1 to 31-n. Each sample hold circuit 31-1 to 31-n is for _R1 , _G1 ,
It has six sample and hold circuits for _B1 , _R2 , _G2 , and _B2 . These sample and hold outputs are stored in memories 32-1 to 32-n, respectively.
added to.

On the other hand, the reference clock oscillator 33 is composed of 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 2f _SC is added to the deflection pulse generation circuit 42, and a signal 6H which is six times the horizontal synchronizing signal H and signal switching pulses r ₁ , g ₁ , b ₁ , r ₂ , g ₂ , b every H/6 are added. ₂ (Figure 3 bB) pulses are obtained. On the other hand, the reference clock 6f _SC is applied to the sampling pulse generation circuit 34, where a shift register controls the clock 1
The effective horizontal scanning period (approx.
1080 sampling pulses during 50μsec)
R ₁₁ , G ₁₁ , B ₁₁ , R ₁₂ , G ₁₂ , B ₁₂ , R ₂₁ , G ₂₁ ,
B ₂₁ , R ₂₂ , G ₂₂ , B ₂₂ ~ _Ro1 , _Go1 , _Bo1 , _Ro2 ,
G _o2 and B _o2 (FIG. 3bA) are generated sequentially, and then one transfer pulse t is generated. These sampling pulses R ₁₁ 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 determined by the horizontal synchronizing signal H.
is controlled so that it is always constant.

These 1080 sets of sampling pulses R ₁₁ to B _o2 are each connected to 180 sample and hold circuits 31-1.
~ 31-n, and thereby each sample hold circuit 31-1 ~ 31-n has 1
When the line is divided into 180 lines, the video signals of R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , and B ₂ for each two picture elements are individually sampled. The sample-and-hold 180 pairs of video signals of R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B ₂ are processed after the sample-and-hold for one line is completed.
The data is transferred all at once to 180 sets of memories 32-1 to 32-n by a transfer pulse t, where it is held for the next horizontal period. This retained R ₁ , G ₁ , B ₁ ,
The signals of R ₂ , G ₂ , and B ₂ are sent to the switching circuit 35-1.
~35-n. Switching circuit 35
-1 to 35-n are R ₁ , G ₁ , B ₁ , R ₂ ,
It is composed of a tri-state or analog gate having individual input terminals for G ₂ and B ₂ and a common output terminal that sequentially switches and outputs them.

The output of each switching circuit 35-1 to 35-n is 180 pulse width modulation PWM circuits 37-1 to 3.
7-n, where the reference pulse signal is pulse width modulated and output according to the magnitude of the sampled and held R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B ₂ video signal. Ru. 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 outputs of the pulse width modulation circuits 37-1 to 37-n are used as control signals for modulating the electron beam to the 180 conductive plates 15-1 of the control electrode 5 of the display element.
~15-n, respectively. The switching circuits 35-1 to 35-n are simultaneously controlled by switching pulses _r1 , _g1 , _b1 , _r2 , _g2 , _b2 applied from the switching pulse generating circuit 36. 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 divided into 6 and divided into H/6. Switch the switching circuits 35-1 to 35-n one by one,
Each video signal of R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B ₂ is time-divided and outputted sequentially, and the pulse width modulation circuits 37-1 to 3
Switching signals r ₁ , g ₁ , b ₁ ,
Generate r ₂ , g ₂ , b ₂ .

What should be noted here is that the switching circuit 3
R ₁ , G ₁ , B ₁ , R ₂ in 5-1 to 35-n,
G ₂ , B ₂ video signal supply switching and electron beams R ₁ , G ₁ , B ₁ , R ₂ ,
The horizontal deflection for switching the irradiation of G ₂ and B ₂ to the phosphor is
They are synchronously controlled to completely match both timing and order. 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 the same applies to G ₁ , B ₁ , R ₂ , G ₂ , and B ₂ R ₁ , G ₁ , B ₁ , of each picture element are controlled by
R ₂ , G ₂ , B ₂ The emission of each phosphor is R ₁ ,
Each picture element is controlled by the video signals of G ₁ , B ₁ , R ₂ , G ₂ , and B ₂ , and each picture element is displayed by emitting light according to the input video signal. Such control is performed simultaneously for 180 sets (each picture element) for one line, and an image of 360 picture elements for one line is displayed.
Furthermore, the processing is performed sequentially for 240 minutes of lines starting from the upper line, and one image is displayed on the screen 9.

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

The conventional structure described above has the following problems. FIG. 8 shows the linear cathode 2, the back electrode 1, and the vertical focusing electrode 3, and a specific method of driving the linear cathode 2 will be described. A driving pulse is applied to the left end of the line cathode 2, the anode of a switching diode 51 is connected to the right end, and a positive fixed bias is supplied to the cathode side by a DC power supply 52. The diodes 51 are individually connected to each of the 15 line cathodes, and the cathodes are all commonly connected to a fixed bias. When the above-described driving is performed with such a configuration, the image on the screen becomes as shown in FIG. 9. Displaying 16 lines in one section in the vertical direction was explained using Figure 2, but if the width of the 1st line and 16th line is defined as the vertical amplitude,
The vertical amplitude is different on the left and right edges of the screen,
As a result, as shown in Figure 9, the right end of each vertical section is
16 line and the first line of the next vertical division are exactly
When adjusting the spacing to be equal to the spacing between each line in the section, a gap will be created between the 16th line of one vertical section and the 1st line of the next vertical section at the left end, and a wedge-shaped horizontal line will be formed between each vertical section. between, i.e. 14
A book appears. This phenomenon occurs because the initial speeds of emitted electrons differ at both ends of the line cathode 2.

This point will be explained with reference to FIG. In Figure 10, -30V is applied to the back electrode 1, +50V is applied to the vertical focusing electrode 3, the distance between both electrodes 1 and 3 is 5 mm, and the line cathode 2
is placed at a position 2 mm from the back electrode 1, and is a potential diagram when 40V _pp is driven from the left end of the line cathode 2 as a drive pulse. When the wire cathode 2 is heated, the voltage drop is 40V at the left end and about 10V due to the resistance component of tungsten, so the voltage is 30V at the right end.
In other words, the fixed bias connected to the cathode side of the switching diode is 30V. It can be seen from the potential diagram in Figure 10 that in this heated state, the line cathode has a voltage of 40V to 30V and no electrons are emitted from any part. In other words, the potential around the line cathode is
This is because the potential is lower than that of . However, in the driving state, the left end of the line cathode 2 becomes OV, so the line cathode 2 emits electrons due to residual heat during heating. At this time, the switching diode is cut off. However, the phenomenon of uniformly emitting electrons from the line cathode 2 means, conversely, that a current flows uniformly, and the current flows into the drive circuit at the left end of the line cathode. In other words, driving the left end of the line cathode to OV means that the right end becomes higher by the voltage drop. This potential difference is approximately 2V
It is. As a result, the potential difference with the vertical focusing electrode 3 is larger at the left end, that is, the initial velocity of electrons is larger at the left end. This means that the vertical deflection electrodes 13,1
There will be a difference in the transit time of 3', and the vertical amplitude will be smaller at the left end where the transit time is faster than at the right end, and as a result, a wedge-shaped horizontal line will appear on the screen as shown in FIG.

Purpose of the invention The present invention eliminates the problems shown in the above conventional example,
The purpose is to stably supply homogeneous high-quality images.

Structure of the Invention The present invention eliminates the generation of wedge-shaped horizontal lines by changing the length of the electrostatic vertical deflection electrode in the direction parallel to the traveling direction of the electron beam on the left and right sides to change the deflection sensitivity.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below based on the drawings. FIG. 11 shows a detailed view of the vertical deflection electrode 4,
The conductors 13-1 and 13-1' made of metallization or the like on the insulating substrate 12 such as glass extend in the left-right direction (travel direction perpendicular to the electron beam travel direction), and one side thereof extends in the electron beam travel direction. The conductors 13-1, 13 are configured to have an inclination with respect to the
-1' The length (width) of the electrode in the direction parallel to the traveling direction of the electron beam is changed on the left and right sides, and the time required for the electron beam to pass through the electrostatic deflection electric field is changed even for different speeds of the electron beam on the left and right sides of the vertical deflection electrode 4. I try to keep it constant. As a result, the wedge-shaped horizontal line shown in FIG. 9 is eliminated, and a straight scanning line can be obtained. The inclinations of the conductors 13-1 and 13-1' may be approximately matched to the wedge-shaped curve in the conventional example appearing on the screen of FIG.

Effects of the Invention According to the present invention, when emitting thermionic electrons to obtain a certain level of brightness using a line cathode,
The wedge-shaped horizontal lines that are caused by the unavoidable differences in vertical deflection sensitivity at different parts of the line cathode can be eliminated by an extremely simple means, and moreover, by a principled means of equalizing the transit time of the vertical deflection electric field. , the effect is extremely large.

[Brief explanation of the drawing]

Fig. 1 is a basic configuration diagram of the image display section, Fig. 2 is an enlarged view of the image display section showing one section horizontally and vertically,
Figure 3 is a basic configuration diagram and waveform diagram of each part of the drive circuit, Figure 4 is a timing diagram showing the generation principle of vertical deflection waveform, Figure 5 is a timing diagram showing the generation principle of line cathode drive waveform, and Figure 6 is line cathode drive pulse,
Timing diagram of vertical deflection signal and horizontal deflection signal. Figure 7 is a timing diagram showing the generation principle of horizontal deflection waveform. Figure 8 is a diagram of the configuration around the line cathode. Figure 9 explains the wedge-shaped horizontal line phenomenon on the screen. Figure 1
0 is a potential diagram around the line cathode, and FIG. 11 is a configuration diagram of a vertical deflection electrode showing an embodiment of the present invention. 2, 2a to 2o... Line cathode, 4... Vertical deflection electrode, 5... Beam flow control electrode, 7... Horizontal deflection electrode, 9... Screen plate, 10... Slit, 1
2... Insulating substrate, 13-1, 13-1'... Conductor, 20... Fluorescent material, 23... Input terminal, 24...
...Synchronization separation circuit, 25...Vertical deflection counter,
26...Line cathode drive circuit, 27...Memory, 28
... Horizontal deflection counter, 29 ... Memory, 30
...Color demodulation circuit, 31-1 to 31-n...Sample hold circuit, 32-1 to 32-n...Memory, 33...Reference clock oscillator, 34...Sampling pulse generation circuit, 35-1 to 35 -n...
...Switching circuit, 36...Switching pulse generation circuit, 37-1 to 37-n...PWM circuit, 38...D/A converter, 39...D/A converter, 40...Vertical deflection drive circuit , 41... Horizontal deflection drive circuit, 42... Deflection pulse generation circuit.

Claims (1)

[Claims] 1 The screen on the screen is vertically divided into a plurality of sections. An electron beam generation source is provided to generate an electron beam in each vertical section, and the electron beam is sequentially deflected in the vertical direction for each of the vertical sections. An electrostatic deflection electrode for forming an electrostatic deflection electric field is provided to display a plurality of lines in each section, and a plurality of lines are displayed horizontally in the middle of the electron beam path from the electron beam generation source to the screen. It has a divided electron beam passage hole or slit,
An electrode is provided to control the emission intensity by controlling the amount of the electron beam irradiated onto the screen according to a video signal, and an electrode is provided for deflecting the electron beam in the horizontal direction for each horizontal section;
Provided with an image display element that enables color reproduction by horizontal deflection by coating different phosphors or other luminescent substances on the screen corresponding to the horizontal deflection position,
By making the electrode length of the electrostatic deflection electrode in the direction parallel to the traveling direction of the electron beam non-uniform with respect to the horizontal direction perpendicular to the traveling direction of the electron beam, the vertical deflection sensitivity can be increased with respect to the horizontal direction. A non-uniform image display device.