JPH0328013B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flat panel image display device, and particularly to improvements in electron beam deflection means.

First, a basic configuration example of a flat panel image display device used here will be explained with reference to FIG.

This display device is displayed in order from the rear 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. They are 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. 2i~2ta. These line cathodes 2 have a diameter of, for example, 10 to 20 μφ.
An oxide cathode material is coated on the surface of a tungsten wire. Then, as will be described later, the electron beams are controlled to be emitted sequentially from the upper line cathode 2a for a fixed period of time. (The back electrode 1 suppresses the generation of electron beams from other line cathodes 2 other than the line cathode 2 that is controlled to emit electron beams for a certain period of time, and directs the generated electron beams only in the forward direction. )
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 2ta, and takes out the electron beam emitted from the line cathode 2 through the slit 10 and directs the electron beam vertically. focus in a direction. (The slit 10 may be provided with crosspieces at appropriate intervals in the middle, or may be a row of many through holes arranged horizontally at small intervals (almost touching), and can be used as a slit. (may be configured). 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, 320 conductive plates 15a to 15n for control electrodes are provided (only 10 are shown in the figure). (Each of the control electrodes 5 extracts the electron beam horizontally by dividing it into one picture element at a time, and controls the amount of the electron beam passing therethrough in accordance with the video signal for displaying each picture element.)
Therefore, if 320 control electrodes 5 are provided, 320 picture elements can be displayed per horizontal line. Also,
In order to display images in color, each picture element is R,
Display is performed using phosphors of three colors, G and B, and the R, G, and B video signals are sequentially applied to each control electrode 5. In addition, 320 sets of video signals for one line are simultaneously applied to the 320 control electrodes 5.
Video for each line is displayed at once.

The horizontal focusing electrode 6 is composed of a conductive plate 17 having a plurality of 320 vertically long slits 16 facing the slits 14 of the control electrode 5, and focuses the electron beam for each pixel divided in the horizontal direction. Each is focused horizontally into a narrow beam of electrons.

The horizontal deflection electrode 7 is composed of a plurality of conductive plates 18 arranged vertically in the middle of each of the slits 16, and a horizontal deflection voltage is applied between each conductive plate 18 for each picture element. The electron beams are respectively deflected in the horizontal direction, and the R, G, and B phosphors are sequentially irradiated on the screen 9 to cause them to emit light. The deflection range is one pixel wide for each electron beam in this embodiment.

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.
A pair of phosphors in each of the three colors R, 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 one pixel 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 16 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 one picture element is provided for one control electrode 5, that is, one electron beam, but two
Of course, two or more pairs for more than two picture elements may be provided, and in that case, R, G, and B video signals for two or more picture elements are sequentially applied to the control electrode 5.
Horizontal deflection is performed in synchronization with this.

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 explained.

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 drive pulse generation circuit 25 is composed of a counter that is reset by a vertical pulse and counts horizontal pulses, and is configured to operate during an effective vertical scanning period (here, 240 hours) excluding the vertical retrace period of the vertical period. 15 drive pulses, each having a length of 16H period, are generated sequentially during the following period. This drive pulse rotor is applied to the line cathode drive circuit 26, where it is inverted so that it is brought to a low potential only during each pulse period and approximately 20
A line cathode drive pulse I′ made at a high potential of volts,
It is converted into B′...T′, and each line cathode 2a, 2b,...
...Added to 2 ta. Each line cathode 2a, ... 2ta is heated by a current flowing through it during the high potential of the drive pulses I' to T', and can emit electrons even during the low potential period of the drive pulses I' to T'. The heated state is maintained. As a result, 15 wire cathodes 2-2
Each low-potential drive pulse
Electrons are emitted only during the 16H period when the data is added. (During the period when a high potential is applied, the potential at the line cathode 2A to 2T 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 high potential applied to the line cathode 2 is positive,
No electrons are emitted from 2 ta. Thus, in the line cathode 2, during the effective vertical scanning period, from the upper line cathode 2a to the lower line cathode 2a,
Electrons are emitted every 16H 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 focused in the vertical direction to form a flat electron beam.

Next, the vertical deflection drive circuit 27 is composed of a counter that is reset by each of the vertical drive pulse generators and counts horizontal synchronizing signals, a conversion circuit that converts the count output from D/A, and the like. , generates a pair of vertical deflection signals v and v' that change in 16 steps by 1H during the 16H period of each vertical drive pulse. The vertical deflection signals v and v′ both have a center voltage of V ₄ , and v increases sequentially,
v′ is configured to change in opposite directions so as to decrease sequentially. These vertical deflection signals v and v' are applied to electrodes 13 and 1 of the vertical deflection electrode 4, respectively.
3', so that each line cathode 2
The electron beam generated from A~2 is directed vertically.
It is deflected in 16 steps, and as mentioned earlier, on the screen 9, one electron beam is deflected so that a raster of 16 lines is sequentially drawn one line at a time from the top.

As a result of the above effects, electron beams are emitted sequentially from the top of the 15 line cathodes 2A to 2T for a period of 16 hours, and each electron beam covers one line from top to bottom within 15 sections in the vertical direction. By being deflected one by one, 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 lines of raster are drawn.

The electron beam thus vertically deflected is horizontally deflected by 320 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 R, G, and B phosphors 2 on the screen 9 are deflected horizontally in three steps.
0 is sequentially irradiated.

That is, the horizontal drive pulse generation circuit 28 is composed of three monostable multivibrators connected in series, and is triggered by a horizontal synchronization signal to generate three horizontal pulses with equal pulse widths within one horizontal period. Generate drive pulses r, g, and b. Here, as an example, each pulse width is approximately 17 μsec.
As, 3 during the active horizontal scanning period of 50μsec.
Three pulses r, g, and b are generated. These horizontal drive pulses r, g, and b are applied to the horizontal deflection drive circuit 29. The horizontal deflection drive circuit 29 generates a pair of horizontal deflection signals h and h' that change in three stages by being switched by the horizontal drive pulses r, g, and b. Both horizontal deflection signals h and h' have a center voltage of V ₇ , and h increases sequentially,
h' change in opposite directions so that they decrease sequentially. 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 horizontally deflected so as to sequentially irradiate the R, G, and B phosphors of the screen 9 for 17 μsec during each horizontal period. However, in the display element of FIG. 1, in the horizontal deflection electrode 7, one conductor 18 or 18' is used for deflecting the electron beams of two adjacent sections, and the electron beams are mutually connected to each other. Since it is designed to produce a deflection effect in the opposite direction, if the electron beam of 320 divisions is deflected in the order of R→G→B in the odd numbered divisions, the electron beam in the even numbered divisions is deflected in the opposite direction. It is deflected in the opposite direction every other section, such as in the order of B→G→R.

Thus, in each line raster, the electron beam is divided into R, G,
Each phosphor 20 of B is sequentially irradiated.

Therefore, a color television image can be displayed on the screen 9 by modulating the electron beam with R, G, and B video signals for each horizontal section of each line.

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. These R, G, and B video signals are processed by 320 sample and hold circuit sets 31a to 3.
Added to 1n. Each sample hold circuit group 3
1a to 31n each have three sample and hold circuits for R, G, and B. The sample and hold outputs of these sample and hold circuit sets 31a to 31n are held by memory sets 32a to 32n, respectively.
32n.

On the other hand, the sampling reference clock oscillator 33
is composed of a PLL (phase locked loop) circuit, etc., and generates a reference clock of about 6.4 MHz in this embodiment. The reference clock is controlled to always have a constant phase with respect to the horizontal synchronizing signal H. This reference clock is applied to the sampling pulse generation circuit 34, where it is delayed by one clock cycle by a shift register, etc., so that the reference clock is applied to the sampling pulse generating circuit 34, where it is delayed by one clock cycle at a time, so that the reference clock is Sampling pulses a to n are sequentially generated, and then one transfer pulse is generated. These sampling pulses a to n correspond to each picture element when one line of the video to be displayed is divided into 320 picture elements in the horizontal direction, and their positions are always constant with respect to the horizontal synchronizing signal H. controlled by.

These 320 sampling pulses a to n correspond to the above 320 sample and hold circuit sets 31.
a to 31n, thereby providing one line to each sample and hold circuit set 31a to 31n.
When divided into 320 picture elements, the R, G, and B video signals of each picture element are individually sampled and held. The sample-held 320 sets of R, G, B video signals are stored in 320 sets of memory 32a~
32c by a transfer pulse t,
Here, it is held for the next one horizontal period.

One line of R, G, and B video signals held in the memories 32a to 32n are applied to 320 switching circuits 35a to 35n, respectively. The switching circuits 35a to 35n each have R, G,
B individual input terminals and a common output terminal that sequentially switches and outputs them, and the output of each switching circuit 35a to 35n is sent to the control electrode 5 of the display element as a control signal for modulating the electron beam.
are individually applied to each of the 320 conductive plates 15a to 15n. Each switching circuit 35a to 35
n are simultaneously switched and controlled by a switching pulse applied from a switching pulse generating circuit 36. The switching pulse generation circuit 36 receives pulses r,
The switching circuits 35a-35n are controlled by R, G,
Each video signal of B is time-divided and outputted alternately and sequentially,
Switching signals r, g, and b are generated to be supplied to control electrodes 15a to 15n. However, among the switching circuits 35a to 35n, the odd-numbered switching circuits 35a, 35c, . . . are switched in the order of R→G→B, and the even-numbered switching circuits 3
5b, 35d...35n are configured to be switched in the reverse order of B→G→R.

What should be noted here is that the switching circuit 3
The switching of the supply of R, G, and B video signals in 5a to 35n and the horizontal deflection of the horizontal deflection of the electron beam to the R, G, and B phosphors by the horizontal deflection drive circuit 29 are performed both in timing and order. This means that they are synchronously controlled so that they match perfectly. As a result, when the electron beam is irradiating the R phosphor, the irradiation amount of the electron beam is controlled by the R video signal, and the G and B are similarly controlled, so that the R and G of each picture element are controlled in the same manner. , B phosphors are respectively controlled by the R, G, and B video signals of the picture elements, and each picture element is displayed by emitting light in accordance with the input video signal. Such control is performed simultaneously on 320 picture elements for one line to display one line of video, and furthermore, 240 picture elements are displayed.
The main lines are sequentially performed 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.

Next, a method for manufacturing the deflection electrode of the flat panel image display device having the above structure will be explained, and the problems of the conventional method will be clarified.

The electrodes used in the flat-panel image display device include vertical focusing electrodes 3, 3', beam flow control electrode 5,
The horizontal focusing electrode 6 and the horizontal deflection electrode 7 are obtained by etching a thin plate of 42-6 alloy (42% Ni, 6% Cr, 52% Fe) into a predetermined pattern. It consists of electrode pieces.

FIG. 4a shows an exploded perspective view of the horizontal focusing electrode 6, spacer 40, and horizontal deflection electrode 7 during manufacture. Each of the electrodes 6 and 7 is made of a 42-6 alloy plate having a thickness of 0.2 mm, which is etched into a predetermined pattern, and then frit glass is applied to both sides of the spacer 40. When these electrodes 6 and 7 are stacked and heated to about 400°C to 500°C in an electric furnace, they are bonded to each other. Thereafter, the horizontal deflection electrode 7 in FIG. 4b (an enlarged view of part A of the horizontal deflection electrode 7 in FIG. 4a) forms a pair of deflection electrodes in which the conductors 18 and 18' are electrically insulated, respectively. In order to do this, the oblique line portion 7a is cut with a laser beam or the like to produce a rectangular horizontal deflection electrode.

Here, the strip-shaped conductor strip groups 18 and 18' constituting the horizontal deflection electrode are connected at their ends so that every other strip has the same electrical potential, and the conductor strip group 18 and the conductor It will be understood from the above description of the basic configuration that a positive or negative potential is applied between the strip group 18' and the electron beam passing between them is deflected.

In this way, the horizontal deflection electrode consists of a very large number of conductor strip groups 18, 1, each of which is electrically at the same potential.
It is composed of 8′ arranged alternately,
With such a configuration, as explained in the previous manufacturing method, it is required to cut the hatched portion 7a shown in FIG. 4b that connects each conductor piece group 18, 18'. . In the case of the horizontal deflection electrode 7, this diagonal line part (connection part) 7a is 1000 to 6000 per sheet.
There are several parts, and it takes about 20 to 60 minutes to cut each part, which poses the problem of extremely high costs during mass production.

The present invention eliminates the above-mentioned drawbacks of the conventional technology, and provides that the surfaces formed by each of the electron beam control means, electron beam deflection means, and light emitting means are parallel to the surface formed by the electron beam source. In a flat panel display device, electron beam passing holes provided in a plurality of sheet electrodes constituting an electron beam deflection means are shifted in position between adjacent sheet electrodes, and each sheet electrode is independently voltage controlled. By deflecting the electron beam using the electrode, it is intended to have the same function as a conventional strip-shaped electrode, but this method requires the tedious work of etching a single metal plate and then separating the connection parts. Manufacturing is extremely simplified as no

The sheet-like electrode plate is the same state as when a thin metal plate is etched. In other words, the conventional process of using it as a strip-shaped conductive piece for a deflection electrode by mechanically processing it after etching to form irregularities and cutting the connection portion is unnecessary. Alternatively, it is an electrode plate formed by stretching a plurality of metal wires to form a substantially one-plane state.

The structure and operation of the deflection electrode of the flat panel image display device of the present invention will be explained with reference to FIGS. 5 and 6. The horizontal deflection electrode 7 is composed of an electrode plate 71 corresponding to the conventional conductor piece group 18 in FIG. 4b, a spacer 72, and an electrode plate 72 corresponding to the conventional conductor piece group 18'. These can be manufactured in the same manner as the manufacturing method shown in the case of Fig. 4, but of course the electrode plates 71 and 72 are not cut using a laser beam, but the horizontal deflection electrodes are etched with through holes provided. It can be used as a part.

Comparing the operation with the conventional case,
In the conventional example, a group of deflection electrode pieces 18 and 18' are formed in one plane as shown in FIG.
However, in the configuration of the present invention, the sheet-like electrode plates 71 and 73 are stacked as shown in FIG. By applying a deflection voltage to each of them, the same deflection as described above can be achieved.

If the deflection electrode is formed with such a configuration,
It is not necessary to perform further mechanical or chemical processing to produce each pair of strip-shaped electrode pieces 18, 18' of the deflection electrode after each electrode is bonded and fixed as in the conventional method, and the process is extremely simple. Therefore, it is possible to manufacture a flat panel image display device having an extremely inexpensive electrode structure.

In the above description, the horizontal deflection electrode was taken as an example, but it is possible to apply the above structure to the vertical deflection electrode. Furthermore, as shown in FIG. 6b, if each electrode of a pair of deflection electrodes is etched in the same shape, and the through holes are shifted in position and stacked, the electrode structure can be manufactured at low cost. There is.

A more specific embodiment of the present invention will be described with reference to FIG. Except for the configuration of the horizontal deflection electrode 7 in FIG. 1, the other electrode configurations are almost the same, so
Only the manufacturing method and operation example of the horizontal deflection electrode 7 will be explained.

Sheet-like electrode plates 71 and 73 shown in FIG. 5 are formed to have the same shape. The electrode plate 71 is made of a 42-6 alloy (42% Ni, 6% Cr, 05% Fe) plate with a thickness of 0.2 mm, and the size of one slit is 0.6 mm ×
It is 15mm long and has 320 slits at 1mm pitch horizontally and 15 vertically. The spacer 72 is made of a 42-6 alloy plate with a thickness of 0.2 mm as described above.
There are 15 openings measuring 326mm x 15.2mm. This 42-6
The surface of the alloy plate is fritted glass with a thickness of 100μ to 200μ.
It is coated with a certain thickness. These electrodes 71,
73. After positioning the spacer 72, it is temporarily fixed and fired in an electric furnace (approximately 400°C to 500°C). At this time, the electrodes 71 and 73 have through holes as shown in FIG. 6b.
Perform alignment at locations that are shifted by 0.25mm from each other. In this step, firing is performed simultaneously with the conventional step shown in FIG. 4, and the electrodes 3', 5, 6, and 7 are bonded simultaneously to produce a partial electrode structure.

The operation with the above electrode configuration will be explained.

A linear electron beam passes through a vertical focusing electrode 3,
The beam is deflected in the vertical direction by the vertical deflection electrode 4, and further passes through the vertical focusing electrode 3', the beam flow control electrode 5, and the horizontal focusing electrode 6. At this time, the horizontal focusing electrode 6
A voltage of about 0V to 100V is applied to. The horizontal deflection electrodes 71 and 73 have an average voltage of 100V.
~400V is applied and the deflection voltage is 30V
A deflection distance similar to that described above can be obtained at ~100 V (p-p). The high pressure of the screen plate 9 is approximately
It is around 5KV to 10KV.

As explained above, if the deflection electrode is constructed by stacking sheet-like electrode plates as in the flat image display device of the present invention, there is no need to install a cutting device using a laser beam or the like, and a new cutting process is required. It can be sufficiently manufactured using conventional processes and equipment without the need for a flat panel image display device, and the mass production effect of the flat panel image display device can be greatly improved.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the basic configuration of a flat panel image display device, Fig. 2 is an enlarged plan view of the main part of the screen plate of the device, Fig. 3 is a basic configuration diagram of the drive circuit of the device, and Fig. 4 4a is a perspective view of a deflection electrode of a conventional flat panel image display device, FIG. 4b is an enlarged view of part A in FIG. 4a, and FIG. 5 is a deflection of a flat panel image display device in an embodiment of the present invention Exploded perspective view of the electrode, Figure 6a,
b is a diagram for explaining the operation of the electrodes of the conventional flat panel image display device and the present invention, respectively. 2... Linear hot cathode, 4... Vertical deflection electrode, 5... Control electrode, 7... Horizontal deflection electrode, 71, 73... Horizontal deflection electrode plate, 72... Spacer.

Claims (1)

[Claims] 1. An electron beam source configured by arranging a plurality of linear cathodes in a planar manner, an electron beam control means, an electron beam horizontal deflection means, an electron beam vertical deflection means, and an electron beam source configured by arranging a plurality of linear cathodes in a planar manner. a light emitting means that emits light upon impact, each of the means being parallel to a plane formed by the electron beam source, and at least one of the horizontal electron beam deflection means and the vertical electron beam deflection means; is constructed by stacking a plurality of sheet-like electrode plates, an electron beam passing hole is formed in the sheet-like electrode plate, and the electron beam passing holes overlap with each other in adjacent sheet-like electrode plates. What is claimed is: 1. A flat panel display device, characterized in that the plurality of sheet-like electrodes are configured to be relatively shifted with each other, and each of the plurality of sheet-like electrodes is independently voltage-controlled. 2. The flat panel display device according to claim 1, wherein at least two of the plurality of sheet-like electrode plates have the same shape.