JPS61264644A - Image display device - Google Patents

Abstract

PURPOSE:To prevent damage of linear cathode and fluctuation of image by deflecting all or a portion of respective electron beam produced from linear cathode in longitudinal direction. CONSTITUTION:Potential for emitting electrons is applied for the interval of 2H onto the vertical scan electrode 5c while potential for deflecting the electron beam at said electron section 5c in vertical direction is applied onto the vertical deflection electrodes 10, 11. Said operations are executed sequentially for the electron beam corresponding with the vertical scan electrodes 5b-5n thus to finish first 1V scan. In order to emit light between the positions 1, 2,... on the screen during next 1V interval, electron beam scanning is executed for the interval of 2H while executing vertical deflection for emitting light from 1' section onto the electron beam corresponding with the vertical scan electrode 5a section, vertical deflection for emitting light from 2' section onto the electron beam corresponding with the vertical scan electrode section 5b and vertical deflection for emitting light from 3', 4' sections onto the electron beam from the vertical scan electrode section 5c. Consequently, vibration of linear cathode is prevented thus to prevent damage.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flat image display device used in color television receivers, computer terminal displays, and the like.

2. Description of the Related Art Recently, thin display devices have been widely used in the field of displaying images, nine characters, and the like.

These thin display devices include flat picture tubes.

The applicant previously filed Japanese Patent Application No. 59-45830,
A flat picture tube was proposed as No. 49515.

The configuration will be explained below with reference to FIG. In reality, each electrode is housed in a glass container, which is a vacuum envelope, but the vacuum envelope is omitted except for some parts in the figure to make the internal electrodes clear. In addition, in order to clarify the horizontal and vertical directions of the screen that displays the nine characters, etc., the face plate has a horizontal direction H and a vertical direction V.
is illustrated. A plurality of vertically long linear cathodes 101 are arranged independently at equal intervals, and the linear cathodes 1
01 has an oxide cathode formed on the surface of the tungsten wire. The number of linear cathodes 1o1, as well as the intervals at which they are arranged are arbitrary. For example, if the display screen size is 10 inches, the intervals at which they are arranged are approximately 10jff, 2
Zero linear cathodes 101 are arranged vertically with a length of about 160 fl. A face plate portion 102, which is a screen portion separated from the linear cathode 101, and a vertical scanning electrode 103 adjacent to the linear cathode 101 are arranged so as to sandwich the linear cathode 101. The vertical scanning electrodes 103 are elongated in the horizontal direction, and are electrically divided and supported on an insulating support 104 at equal pitches. These vertical scanning electrodes 103 have a number of horizontal scanning lines in the vertical direction (NTSC
(approximately 480 electrodes) are formed as independent electrodes.

Note that the number of vertical scanning electrodes 103 may be 1/n of the number of horizontal scanning lines. Linear cathode 101 and face plate) 102
In order from the linear cathode 101 side, there are a first grid electrode (hereinafter referred to as G1 electrode) 1o5, a second grid electrode (hereinafter referred to as G2 electrode) 1o6, and a third grid electrode (hereinafter referred to as G5 electrode). A fourth grid electrode (hereinafter referred to as G4 electrode) 108 is arranged. G
1 electrode 105 is a planar electrode having an opening 1o9 (see FIG. 6) in a portion corresponding to the linear cathode 101, and is divided between adjacent linear cathodes 101, and a video signal is applied to each electrode. beam modulation. G2 electrode 10
6 and the G5 electrode 107 have the same opening 11 as the G1 electrode 105.
0,111 (see Figure 6) and is not vertically divided. The G4 electrode 108 has an aperture 112 (see FIG. 6) that is the same as the G2 electrode 106°G3 electrode 107C1 apertures 110, 111, or is wider in the horizontal direction than in the vertical direction. Between the G4 electrode 10B and the 7 ace plate 1o2 are horizontal deflection electrodes 113 and 113B.

113C are arranged symmetrically with respect to the straight axis of the electron beam from each linear cathode 101 and at the same intervals as the linear cathode intervals. 113 people at each horizontal deflection electrode.

113B and 113G are formed on the surface of the insulating support 114 by means such as plating or vacuum deposition, and perform horizontal focusing and horizontal deflection. face plate 1o
A light emitting layer consisting of a phosphor 115 and a metal back electrode 116 is formed on the inner surface of 2. The phosphor 116 sequentially emits light (5), green (G), and blue (B) in the horizontal direction during color display.
) is formed as stripes or dots.

Next, the operation of the flat picture tube described above will be explained.

In FIG. 6, a current is passed through the linear cathode 101 to heat it, and a voltage approximately the same as the potential of the linear cathode 1o1 is applied to the G1 electrode 1o6 and the vertical scanning electrode 103. At this time, the G1 electrode 105. An electron beam advances from the linear cathode 101 toward the G2 electrode 106, and each electrode 105, 1
A voltage (approximately 100 to 5 oov) higher than the potential of the linear cathode 101 is applied to the 02 electrode 106 so that the electron beam passes through the openings 110 and 111 provided in the 06 electrode. Here, the electron beam is 01+G2 electrode 106,10
The amount of light passing through each of the openings 110 and 111 of No. 6 is controlled by changing the voltage of the G1 electrode 105. The electron beam passing through the aperture 111 of the G2 electrode 106 is transmitted to the G5 electrode 107. G4 electrode 1o8. Horizontal deflection electrodes 113 and 113B face each other across the electron beam.

113C, a predetermined voltage is applied to these electrodes so that the electron beam forms a small spot on the fluorescent surface. Here, the beam focus in the vertical direction is the G4 electrode 10.
The beam focus in the horizontal direction is performed by an electrostatic lens formed at the exit of the aperture 112 of 8.
This can be obtained by changing the center voltages applied to the people, 113B, and 1130. In addition, these horizontal deflection electrodes 113, 113B, and 113C each have two common bus lines 113M-a, b, 113B-a, b,
113G-a and b, and through these busbars, the sawtooth wave or step-wave deflection power of the horizontal scanning period is superimposed simultaneously with each horizontal focus voltage, and each electron beam is horizontally focused with a predetermined width. deflected in the direction

The deflected electron beam stimulates the phosphor 115 to form a luminescent image on the screen. At this time, in order to obtain a color image, etc., when each electron beam horizontally scans the phosphor 116 as described above, the modulation signal of the color corresponding to the phosphor of each color that the electron beam is incident on is 01 The voltage may be applied to the electrode 105.

Next, vertical scanning will be explained with reference to FIGS. 7 and 8. As described above, by controlling the voltage of the vertical scanning electrode 103 so that the potential of the space surrounding the linear cathode 101 becomes more positive or negative than the potential of the linear cathode 1o1, the linear cathode 101 The generation of electrons from is controlled. At this time, the linear cathode 1o1 and the vertical scanning electrode 1
03, the voltage for controlling ON/OFF of the electron beam from the linear cathode 101 can be small. When the interlaced method is adopted, the vertical scanning electrode 103 receives a (hereinafter ON) signal that generates an electron beam for one horizontal scanning period (1H) from the 103 members of the vertical scanning electrode in the first field. , 1 during the next 1H
A signal to turn on the electron beam is applied to 03G, and then a signal to turn on the electron beam for 1H is applied to every other vertical scanning electrode, and when 103x, which corresponds to the bottom of the screen, is completed, the signal to turn on the electron beam is applied to every other vertical scanning electrode. The scan is complete.

In the next second field, a signal is applied from the vertical scanning electrode 103B to turn on the electron beam for only 1H at the same time, and one frame of vertical scanning is finally completed by scanning up to 103 frames.

Also, Figs. 9 and 10 show the signal processing system applied to the 01 electrode for displaying television images using a cathode ray tube having a large number of electron beam generation sources in the horizontal direction, such as the above-mentioned flat color cathode ray tube. Refer to and explain. Based on the television synchronization signal 142, a timing pulse generator 144 generates a timing pulse for driving a circuit block to be described later. First, the video 141 demodulated by one of the timing pulses is converted into a digital signal by the A/D converter 143, and the signal for 1H is input to the first line memo IJ-145. When all the signals for 1H are input, the signals are simultaneously transferred to the second line memory 17-146, and the next 1H signal is also input to the first line memory 146.

The signal transferred to the second line memory 146 is stored and held for 1H, and is also sent to the Dμ converter (or pulse width converter) 147, where it is converted to the original analog signal (or pulse width modulated signal). ), amplified and applied to each 01 electrode 105 of the cathode ray tube. Here, line memory is used for time axis conversion,
A specific explanation will be given using FIG. 10. Assuming that the number of electron beams (i.e., the number of cathodes) used to scan the display screen area is five, the video signal 1 for a certain 1H
The video signal insertion time T of 51 is divided into 7 people, the time axis of the video signal of each divided period is multiplied by 5 and extended to 1 hour, and this signal 162 is transmitted to each of the corresponding 4G1 electrodes 10.
5. In this way, an image covering the entire 1H is displayed, and by sequentially performing vertical scanning, the entire image can be synthesized on the screen.

Problems to be Solved by the Invention However, in the conventional configuration as described above, the vertical scanning electrode 10
The pitch of 3 is about 0.6 to 1 g, which is good if the screen to be displayed is small, but as the screen becomes larger, the area of this vertical scanning electrode 103 also increases, and the glass support Accuracy and manufacturing method of insulating support 102 and vertical scanning electrode 1o3 formed on this insulating support 102
There are also problems in manufacturing, such as the formation of a conductive film and the processing equipment and handling due to the size during photoetching. In addition, as the area of the screen becomes larger, the linear cathode 101 becomes longer. Conventionally, at least one end of the linear cathode 101 is attached to a spring member for stretching. Mechanical vibration of the linear cathode 101 cannot be prevented simply by stretching it.

As a result of this vibration, the linear cathode is short-circuited with the electrode and damaged, and the flow of electrons generated from the linear cathode becomes unstable, causing brightness to change on the screen and causing image fluctuation.

Therefore, the present invention solves the above problems, and can be easily manufactured even when the screen is enlarged, and can prevent vibration of the linear cathode, thereby preventing damage to the linear cathode and image fluctuation. An object of the present invention is to provide an image display device that can perform the following functions.

Means for solving the problems and the technical means of the present invention for solving the above problems include one or more stretched linear cathodes, and an electrical connection in the length direction of the linear cathodes. Scan electrodes are divided and arranged in parallel at a wide pitch in a direction orthogonal to the linear cathode; The device is equipped with a deflection electrode for deflecting all or part of the individual electron beams in the length direction of the linear cathode.

Effects of the present invention With the above-described configuration, the present invention can be manufactured by dividing the scan electrode into parts with a wide pitch where the scan electrodes are missing. By deflecting the image to the position of the portion where the image is displayed, missing portions are prevented from occurring on the screen. In addition, the linear cathode can be supported in a vibration-proof manner by using the wide pitch part where the scanning electrode is missing. The flow of electrons generated from the cathode can be stabilized.

EXAMPLE Hereinafter, an example of the present invention will be described in detail with reference to the drawings. In FIG. 1, in order to clarify the horizontal and vertical directions of the screen, a horizontal direction H and a vertical direction V are shown on the surface of the glass substrate 6, which is the screen section 4. The linear cathode 1 is constructed by forming an oxide cathode on the surface of a tungsten wire. A plurality of linear cathodes 1 are vertically long and arranged independently at equal intervals. In this embodiment, as shown in FIG. 4, each linear cathode 1 is stretched between spring members 3 attached to an insulating support 2 made of glass or the like.

The number and spacing of the linear cathodes 1 are arbitrary. A screen portion 4 that is spaced apart from the linear cathode 1 and a vertical scanning electrode 5 that is close to the linear cathode 1 are arranged so as to sandwich the linear cathode 1 . The vertical scanning electrodes 5 are spaced apart from the linear cathode 1 by a predetermined distance, extend in a direction perpendicular to the linear cathode 1, that is, in a horizontal direction, and are arranged in parallel on the insulating support 2 while being separated from each other in the vertical direction. The vertical scanning electrode 5 is electrically divided in the length direction of the linear cathode 1 and is formed to be elongated in the horizontal direction.
They are arranged side by side at a pitch twice the horizontal scanning lines when displaying both TV images, and have a wider pitch for every X horizontal scanning lines (X>2), that is, a pitch of m lines (m1). are doing. In the figure, there is an interval of one line (m=2) for every three lines (X=3). To manufacture this vertical scanning electrode 5,
A conductive film made of metal or oxide is formed on the surface of the insulating support 2 by photo-etching, or a metal plate is divided into multiple parts by photo-etching. Between the linear cathode 1 and the glass substrate 6 that becomes the screen, G1 electrodes 7. G2 electrode 8°G5 electrode 9. Vertical deflection electrodes 10, 11. A G4 electrode 12 and a horizontal deflection electrode 13 are arranged. The G1 electrode 7 is made of a metal plate, is electrically divided into individual parts corresponding to the linear cathode 1, and has an electron beam passage hole 14 (see FIG. 2) at a position facing the linear cathode 1. There is. This G1 electrode 7 modulates electrons generated by heating the linear cathode 1 with a video signal or the like. The G2 electrode 8 is formed of one sheet, or the G1 electrode 7
It is divided in the same way (one sheet is shown in the illustrated example), and similarly an electron beam passage hole 16 (see FIG. 2) is formed. This G2
A predetermined potential is applied to the electrode 8 to draw out the particles from the linear cathode 1.

The G3 electrode 9 is formed of one sheet, and similarly an electron beam passage hole 16 is formed therein. A potential is applied to this G3 electrode 9 mainly to obtain beam focus in the horizontal and vertical directions. The vertical deflection electrodes 10.11 are a set of two, each having an electron beam passage hole 17.18 (see FIG. 2), and the electron beam passage holes 14, 15.
The electron beam that has passed through 16 is deflected in the vertical direction or its position is changed. These vertical deflection electrodes 10.11
As shown in FIG. 2, the electron beam passing holes 17 and 18 are arranged to sandwich each electron beam and to be shifted in position in the vertical direction. A deflection voltage is applied to the pair of vertical deflection electrodes 10.11 as described later. The G4 electrode 12 is formed of one piece, and has an electron beam passage hole 19 (see Fig. 2).
is formed.

Similar to the G5 electrode 9, a potential is applied to this G4 electrode 12 in order to obtain the optimum beam focus. The horizontal deflection electrodes 13 correspond to each linear cathode 1 and are arranged facing each other. The horizontal deflection electrode 13 includes, for example, a conductive material 21, 21B, and 210 electrically divided into a plurality of parts in the electron beam traveling direction on the surface of an insulating support (glass plate) 20. These divided horizontal deflection electrodes 13 are formed into a set of opposing electrodes that sandwich the electron beam, and the same deflection voltage is applied to each set with different center voltages. The center voltage applied to each horizontal deflection electrode 13 is set so that the horizontal spot of the electron beam becomes the smallest on the screen. The glass substrate 6 constitutes a part of the vacuum envelope, and the inner surface of the glass substrate 6 has a phosphor 22. A metal back layer 23 is formed.

The phosphor 22 is red if color display is to be performed.

Green and blue striped phosphors are arranged at a predetermined pitch. Each of the above-mentioned linear canodes 1 has X pieces (
The vertical scanning electrodes 5 are arranged at wide pitches of 11-1 (m) 1) for every X>2) and are supported by a support 24 to prevent vibration. The support 24 is made of a thin wire-shaped insulator or conductor, and is attached to the insulating support 2 by means such as adhesion with an adhesive 26, and is arranged in contact with or in close proximity to the wire cathode 1. There is.

Next, the operation of the above embodiment will be explained. In FIG. 2, electrons generated by passing a current through the linear cathode 1 and heating it are transferred to the longitudinal direction of the linear cathode 1 by vertical scanning electrodes 51L to 6n provided on the back surface of the linear cathode 1. Switching operation (ON, OFF)
will be carried out. If the vertical scanning electrodes 6a to 5n are used for displaying both TV images, the pitch is twice that of the horizontal scanning line as described above, and m-1 (m
〉1) Place them at intervals. These vertical scanning electrodes 6a
-5n, the signals shown in FIG. 3 are applied to the upper part of the screen 6a to p5n. First, a potential for generating electrons from the linear cathode 1 in the direction of the 01 electrode 7 is applied from the top Sa of the screen for 1 horizontal scanning period (1H) every 1 field section (1V), and then to 5b the following voltage is applied. A potential for generating electrons is applied for only 1H period, and a potential for generating electrons for the next 1H plus 1H and 2H period is applied for the next 50, and these operations are performed sequentially from 60 to 6n. The above steps are performed for each vertical scanning electrode to perform switching of electrons in the vertical direction of the screen. The electron beams that have been scanned in the vertical direction are modulated, beam focused, etc. by each electrode provided between the linear cathode 1 and the glass substrate 6 that is the screen section 4, and the electron beams are aligned in the electron beam running direction (electron Passing hole 17
．． The interlacing operation and the vertical deflection are performed by two vertical deflection electrodes 10, 11 whose positions of 18 are shifted in the vertical direction. The traveling state of the electron beam during these operations is shown in FIG. The electron beam corresponding to the vertical scanning electrode 6& portion causes a portion 1 on the screen portion 4 to emit light, and then the vertical scanning electrode 6b portion illuminates a portion 2 on the screen portion 4.
The vertical scanning electrode 5c sequentially causes parts 3 and 4 on the screen portion 4 to emit light. At this time, a potential for generating electrons is applied to the vertical scanning electrode 6C for a 2H period, and at the same time, as shown in FIG. A potential is applied to vertically deflect. Hereinafter, the first 1V scan is completed by sequentially performing these operations on the electron beams corresponding to the vertical scanning electrodes 5b to 6n. Next, in the next 1v period, 1.2, 3.
In order to emit light between the positions where the light is emitted (interlace operation), the electron beam corresponding to the vertical scanning electrode SfL section is vertically deflected so as to emit light between 1 and 2, that is, the 1' section. , the electron beam corresponding to the vertical scanning electrode section 6b is vertically deflected between 2 and 3, that is, the 2' section is vertically deflected so that the electron beam at the vertical scanning electrode section 60 is deflected between 3' and 4. vertical deflection is performed to perform electron beam scanning for a 2H period. Hereinafter, these operations will be explained using the vertical scanning electrode 6d.
1V scanning is performed by performing the same operation for the electron beam corresponding to 5n from .

Therefore, even if vibration occurs in the linear cathode 1 due to electrical or mechanical causes, a damper effect is produced by the support 24, and the vertical scanning electrode 6 and the linear cathode 1 are electrically short-circuited. There's nothing to do.

Further, the flow of electrons generated from the linear cathode 1 can be stabilized.

In the above embodiment, the glass insulating support 2 that supports the vertical scanning electrode 6 is illustrated as being formed in one piece, but it can also easily be manufactured by dividing it into a plurality of pieces in the horizontal direction. be. Also, the vertical scanning electrodes 5 are provided at a pitch twice that of the horizontal scanning lines;
Each book (X>2) may be provided with an interval of mm-1 (,>1), and in this case, interlacing and screen scanning can be performed by a combination of vertical scanning electrode 5 switching and vertical deflection. can. In addition, the vertical scanning electrode 5 is connected to the horizontal scanning line n(
At a pitch of n:>1), every X line (X>2) is spaced by m-1 lines (m)1), and an n x 1 horizontal scanning period and a (J+K) x 1 horizontal scanning period ( J>1, K>1> A similar effect can be obtained by generating or passing an electron beam and scanning the screen by vertical deflection.Furthermore, the vertical scanning electrode 5 is connected to the screen portion 4 by the linear cathode 1. However, it may also be provided between the linear cathode 1 and the screen portion 4. In this case, an electron beam passing hole may be provided.Also, an electrode for vertically deflecting the electron beam may be provided between the linear cathode 1 and the screen portion 4. 10.11 uses two plate-shaped electrodes in the electron beam traveling direction, but in addition to this, for example, the electrodes may be arranged so as to sandwich the electron beam and face each other.

Further, the number and position of electrodes can be changed arbitrarily. Furthermore, the linear cathode 1 is arranged long in the vertical direction with respect to the screen part 4, but the whole body is rotated 90', the linear cathode 1 is extended horizontally, and the vertical scanning electrode 5 is arranged in the horizontal direction. Beam modulation electrode ・Similar effects can be obtained even when used together.

Effects of the Invention As is clear from the above explanation, according to the present invention, the scanning electrodes are arranged in a direction orthogonal to the linear cathode, and each scan electrode has a wide pitch, and the electron beam generated from the linear cathode is The linear cathode is deflected in the length direction by a deflection electrode.

Therefore, it is possible to manufacture the vertical scanning electrode by dividing it, and manufacturing becomes easy even when the screen is enlarged. The missing portion of the vertical scanning electrode can be compensated for by deflecting at least a portion of the electron beam in the vertical direction using a vertical deflection electrode provided between the linear cathode and the screen. In addition, a support body can be provided in the wide pitch portion between the vertical scanning electrodes to prevent vibration of the linear cathode.1 By providing this support body, vibration of the linear cathode can be prevented and damage can be prevented. It is possible to stabilize the flow of electrons generated from the linear cathode and prevent image fluctuation.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the image display device of the present invention, FIG. 1 is a perspective view, FIG. 2 is a longitudinal sectional view for explaining the operation, and FIG. 3 is a vertical scanning electrode and a vertical deflection device. A diagram of signals applied to the electrodes, FIG. 4 is a perspective view of a linear cathode support, FIG. 5 is a perspective view of a conventional image display device, FIG. 6 is a horizontal cross-sectional view thereof, and FIG. 7 is a vertical scanning electrode section. 8 is a timing chart for explaining the operation of the vertical scanning electrodes, FIG. 9 is a signal processing system diagram, and FIG. 10 is a diagram for explaining video signals. 1... Linear cathode, 4... Screen portion,
6... Vertical scanning electrode, 7... G1 electrode, 8... G2 electrode, 9... G5 electrode,
10.11... Vertical deflection electrode, 12...
・G4 electrode, 13...Horizontal deflection electrode. Name of agent: Patent attorney Toshio Nakao and one other person
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Claims (5)

[Claims] (1) One or more stretched linear cathodes, electrically divided in the length direction of the linear cathodes, long in the direction orthogonal to the linear cathodes, and arranged so that each plurality of cathodes have a wide pitch. A scanning electrode is provided between the linear cathode and the screen portion, and is for deflecting all or part of the individual electron beams generated from the linear cathode in the length direction of the linear cathode. An image display device comprising a deflection electrode. (2) A patent claim in which X scanning electrodes (X>2) are arranged in parallel at a pitch that is n times the scanning line pitch (n>1), and each X scanning electrode is arranged in parallel at a pitch wider than the pitch. The image display device according to item 1. (3) The image display device according to claim 1, wherein the linear cathode is supported to prevent vibration by a support provided at a wide pitch between the scanning electrodes. (4) The scanning electrodes are arranged in n×1 horizontal scanning period (n>1) and (l+K)×1 horizontal scanning period (l>1, K
3. The image display device according to claim 1, wherein a potential for selectively generating or passing an electron beam is applied to >1). (5) Claim 1, wherein the deflection electrode is applied with a signal for performing multi-stage deflection of a specific electron beam among a plurality of electron beams generated in the length direction of the linear cathode. image display device.