JPH04167345A - Flat cathode-ray tube display unit - Google Patents

Abstract

PURPOSE:To reduce power consumption and also prevent breaking of cathodes by providing a channel in a back plate located in a portion corresponding to just below the longitudinal direction in which the linear electrodes arranged on the same plane are extended, so as to form a space portion. CONSTITUTION:Linear electrodes 105 are arranged on the same plane and a channel 102 is provided in a back plate 101 located in a portion corresponding to just below the longitudinal direction in which the linear electrode are extended, to form a space portion 1O2'. Control electrodes 103, 104 each transmits drive signals to the cathodes 105 to control emitted electrons in such a manner as dividing the electrons in the horizontal direction. A back electrode 109 is provided on the back plate 101 and is put in conduction to a positioning means 112 and when a heating voltage is applied to the electrode 109 the plurality of electrodes 105 can be heated and actuated simultaneously. Then absorption of heat of each cathode 5 into the back plate 101 is prevented by formation of the space portion and application of extra voltage to the cathodes 5 is avoided and partial heating is prevented. Power consumption is thus reduced while breaking of cathode 5 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flat cathode ray tube display device for displaying characters, graphs, ink, etc.

[Prior art]

The flat cathode ray tube display device proposed by the applicant is the third
As shown in the figure.

The flat cathode ray tube display device 315 shown in FIG. 3(a) is
Electrons emitted from a plurality of linear cathodes 301 are made to strike a fluorescent display means (screen 304) to display an arbitrary image.

In the flat cathode ray tube display device 315 shown in FIG. 3(a), 301 is a linear cathode in which a thin tungsten wire with a diameter of several tens of microns is directly coated with an electron-emitting oxide such as (Br, Sr, Cu)O. , 302 is an extraction electrode that has a through hole 302' for passing electrons and is made of approximately the same number of plates as the linear cathode 301; 303 is a vertical deflection electrode configured to sandwich the linear cathode 301; 304 is the front plate 31
A screen 305 is made of aluminum or 426 alloy (Ni: 42%, Cr: 6%,
The control electrode is a striped control electrode made of a metal thin film (the remainder being Fe).

The linear cathode 301 has cathode locking means 308 made of 426 alloy or the like arranged in a recess 307 of the back plate 306, and cathode extension means 309 made of stainless steel or the like and having spring properties.
A stress of several to several tens of grams is constantly applied by
fl) is stretched and stretched.

The positioning of this linear cathode 301 is performed using the back plate 306.
This is accomplished by a positioning member 310 made of 426 alloy or the like, which has a 7-shaped cut groove 310' provided thereon for positioning, and has a thickness corresponding to the desired height of the linear cathode.

Also, cathode locking means 308 or cathode extension means 309
By applying a heating voltage of several to several tens of volts to the electrode terminal 312 formed in common with the sealing surface 311 and led out to the outside, the linear cathode 301 is heated to 600 to 800°C. Electrons are emitted from the linear cathode 301.

The extraction electrode 302 extracts electrons from the linear cathode 301 by applying a positive potential to the linear cathode 301 when electrons are emitted from the linear cathode 301 . In addition, it is also used to minimize the focusing of electrons emitted in a direction perpendicular to the surface of the free leaf 3040.

The vertical deflection electrode 303 assists in focusing the electrons extracted by the extraction electrode 302, and also deflects the electrons in a direction perpendicular to the front plate 313, so that the electrons are deflected in a predetermined raster pattern on the screen 304 formed on the inner surface of the front plate 313. It is used to deflect and scan electrons.

The control electrode 305 is perpendicular to the longitudinal direction of the linear cathode 301 and is divided into approximately the same number as the horizontal resolution of the flat cathode ray tube display device 315, so that the electrons emitted from the linear cathode 301 are directed horizontally. This is for divided control.

The flat cathode ray tube display device 315 having the configuration shown above is as follows:
The sealing surface 311' of the front plate 313 and the sealing surface 311 of the rear plate 306 are vacuum-sealed and then completed through a process such as cathode baking. A tube 314 is used.

[Problem to be solved by the invention]

However, the flat cathode ray tube display device 315 described above has the following problems.

That is, since the distance between the back plate 306 and the linear cathode 301 is very close, the heat for heating the linear cathode 301 is transmitted from the linear cathode 301 to the back plate 306 (
Since the inside of the flat cathode ray tube display device 315 is a vacuum, the heat from the linear cathode 301 is radiated as infrared rays.) Most of the heat is consumed to heat the back plate 306. Therefore, a large amount of electric power is required to heat the linear cathode 301 to a desired temperature (600 to 800°C in the conventional example). 0.2 to 0 to
．． 5W of power was required.

Further, when a heating voltage is applied to the linear cathode 301 under the above-mentioned situation, the linear cathode 301 at a location A (between the cathode stretching means 309 and the positioning member 310) shown in FIG.
The temperature reached 1000° C. or higher, which caused the problem that the linear cathode 301 at this location A would break.

On the other hand, the linear cathode 301 is coated with (Br, Sr,
Electron-emitting oxides such as Cu) 0 are extremely unstable in air, so they are initially in the form of carbonates, that is, (Br, S
r, Cu) is coated on the linear cathode 301 in the form of COI. After the front plate 313 and the back plate 306 are vacuum-sealed, the linear cathode 301 is heated in a cathode baking process to decarboxylate (Br, Sr, Cu) CO3 (hereinafter referred to as activation of the linear cathode 301). is carried out, (Br, Sr, C
u) CO3 releases carbon dioxide gas and (Br
, Sr, Cu) O.

However, because the linear cathode 301 and the back plate 306 are very close to each other, the carbon dioxide gas released from the linear cathode 301 when the linear cathode 301 is activated is not sufficiently exhausted, and the linear cathode 301 and the back plate 306, which caused a problem. Therefore, as a result, the linear cathode 301 was not activated sufficiently.

Furthermore, the back plate 30 directly under the extended longitudinal direction of the linear cathode 301
The insulator such as glass forming the linear cathode 301
Since charge amplification occurs when electrons are emitted, a discharge occurs between the control electrodes 305, and as a result, the flat cathode ray tube display device 315 itself cannot fully perform its functions.

[Purpose of the invention]

The present invention has been made in view of the above problems, and its purpose is to reduce the power consumption of the linear cathode, and to provide a highly reliable flat cathode ray tube without causing breakage of the linear cathode. The purpose of this invention is to provide a display device.

[Means to solve the problem]

The configuration of the present invention for achieving the above object includes a plurality of linear cathodes arranged on the same plane, and above the linear cathodes,
and a take-out electrode arranged at a constant distance from the linear cathode, and an electrode arranged below the linear cathode and on a back plate made of an insulator in a direction perpendicular to the longitudinal direction in which the linear cathode is extended. a plurality of striped control electrodes provided; a vertical deflection electrode disposed above the extraction electrode and sandwiching the linear cathode; and a vertical deflection electrode formed on the inner surface of the front plate and integrated with the phosphor. A flat cathode ray tube display device configured with a screen having an anode, characterized in that a groove is formed in the back plate at a location directly below the linear cathode in the longitudinal direction thereof to form a space. do.

〔Example〕

An embodiment of the present invention will be described with reference to FIG.

The configuration of the flat cathode ray tube display device of the present invention is basically the same as the conventional flat cathode ray tube display device 315 shown in FIG. 3, but the difference from the conventional example is shown in FIG. 1(a). As shown in FIG. 2, a groove 102 is provided in the back plate 101 at a location directly below the extended longitudinal direction of a linear cathode (not shown).
02'. And this back plate 1
01 is made of an insulating material such as glass, and forms a concave portion 108 excluding the base portion 106 on which the control electrode 103 is provided and the sealing surface 107. Further, the groove 102 in this embodiment is formed to have the same depth as the recess 108.

Moreover, on this groove 102, as shown in FIG. 1(b),
A short control electrode 104 is provided so as to be electrically conductive with a plurality of striped control electrodes 103 provided on the back plate 101, and furthermore, a short control electrode 104 is provided above the control electrode 104 in a direction perpendicular to the control electrode 104. A linear cathode 105 is provided at.

Control electrodes 103 and 104 are both signal transmission means for transmitting a drive signal to each linear cathode 105.
This is to horizontally divide and control the electrons emitted from 05.

Specifically, the control electrode 104 is made of 426 alloy (Ni: 42%, Cr: 6%, balance F
e) or a short type plated with nickel or silver several to several tens of microns thick.

The control electrode 103 is made of aluminum formed on the back plate 101.
Alternatively, a vapor-deposited film of indium oxide or the like is further coated with silver plating or a conductive paste of silver, nickel, etc., which is then divided into a plurality of stripes by etching.

Further, welding or a firing method using a conductive paste such as silver is used as a means for electrically connecting the control electrode 103 and the control electrode 104, and among these welding methods such as laser welding or seam welding are particularly preferred. Furthermore, the end of the control electrode 104 is controlled? It is preferable to provide a plurality of through holes (not shown) at the location to be welded and fixed to the I electrode 103. In this way, the heat capacity during welding can be lowered and the joint strength can be further strengthened.

Further, when electrically conducting the control electrode 104 with the control electrode 103, a plurality of control electrodes 104 are fixed at once to the stripe width of the control electrode 103 using, for example, magnetic fixing means, so that each of the control electrodes 104 is It is preferable to perform this after preventing dissociation.

The back electrode 109 is an electrode used when applying a heating voltage to the linear cathode 105, and is formed on the back plate 101 in the same manner as the control electrode 103 described above.

The linear cathode 105 is a thin tungsten wire with a diameter of several tens of microns and is directly coated with an electron-emitting oxide such as (Br, Sr, Cu) O, etc. A stress of several to several tens of grams is constantly applied by the linear cathode locking means 110 consisting of a linear cathode locking means 110 made of stainless steel or the like and having spring properties, 0.1 to 0.5 m*), and the control electrode 104
It is stretched in a direction perpendicular to the The linear cathode 105 is positioned by positioning means 112, which will be described later, and the linear cathode 105 is fixed to the linear cathode locking means 110 and the linear cathode stretching means 111 by welding. Further, this linear cathode 105 is heated to 600 to 800° C. by a heating voltage of several to several tens of volts applied through the back electrode 109 and emits electrons.

Here, the positioning means 112 will be specifically explained.

This positioning means 112 is located at both ends of the control electrode 104.
The control electrodes 104 are placed simultaneously with the control electrodes 104 using the above-mentioned collective fixing means for the control electrodes 104.

FIG. 1(c) is an enlarged view specifically showing the positioning means 112, and 201 in the figure is a 4.
It is a positioning member made of nickel or the like plated on 26 alloy or the like, and has a groove 203 in the center for fixing a fiber 202, which will be described later. Further, the positioning member 201 further has a protrusion 204 at its center.
4 has a 7-shaped cut groove 205 formed therein. This cut groove 205 is for positioning the linear cathode 105 in the lateral direction with respect to the l1li electrode 104 when arranging it.

The aforementioned fiber 202 is made of, for example, tungsten wire, and when fixed to the linear cathode 10
It has a diameter corresponding to an extended height of 5 mm.

Furthermore, when the linear cathode 105 is stretched and stretched, the linear cathode 1
057 It is also provided so that electrical contact can be made.

Further, the positioning means 112 is configured to control the control electrode 10 as described above.
4 and fixed so as to be electrically conductive to a back electrode 109 formed on the back plate 101. For this fixing, for example, a firing method using a conductive paste such as silver is used. Therefore, the back electrode 109 is electrically connected to the linear cathode 105 via the positioning means 112.

As in this embodiment, by providing the back electrode 109 on the back plate 101 and establishing electrical continuity with other positioning means 112, by applying a heating voltage to the back electrode 109, a plurality of linear cathodes 105 are simultaneously heated. , operation (linear cathode 10
(emission of electrons from 5).

Further, in order to heat and operate the linear cathodes 105 independently (emission of electrons from the linear cathodes 105) as in the conventional case, the back electrodes 109 are placed at appropriate positions on the back plate 101.
What is necessary is to cut off the electrical conduction and apply a heating voltage to each linear cathode 105. Alternatively, as in the conventional case, a heating voltage is applied to an electrode terminal 113 formed in common with the linear cathode locking means 110 and the linear cathode extending means 111. may be applied.

Further, the flat cathode ray tube display device of the present invention is provided with extraction electrodes, vertical deflection electrodes, etc. (not shown), and their specific configuration will be explained.

The extraction electrode is arranged above the linear cathode 105 and at a constant distance from the linear cathode 105, and when electrons are emitted from the linear cathode 8i 105, the linear cathode 105
Electrons are extracted from the linear cathode 105 by applying a positive potential to the linear cathode 105.

The vertical deflection electrodes are arranged to sandwich the linear cathode 105, and assist in focusing the electrons extracted by the extraction electrode, and also deflect the electrons in a direction perpendicular to the front plate (not shown). Electrons are deflected and scanned onto a predetermined rask area of a screen (not shown) formed on the inner surface of the front plate.

The flat cathode ray tube display device having the above-described configuration is further vacuum-sealed using the sealing surface (not shown) of the front plate and the sealing surface 107 of the back plate 101, and then the linear cathode 105 is subjected to a baking treatment, etc. completed. Also, as shown in Figure 2, the pressure that is led out to the outside during this vacuum sealing is shown in Figure 2. 11
When the 1 electrode 103 and the back electrode 109 are formed by applying metal plating 207 such as silver on the vapor deposited film 206 of aluminum or indium oxide, etc., the general method is used for vacuum sealing. Since the low melting point solder glass containing lead oxide as a main component used in the display is not compatible with the picture electrodes 103 and 109, there is a risk of airtightness in the flat cathode ray tube display device being poor. Therefore, it is preferable to treat the control electrode 103 and the back electrode 109 corresponding to the sealing surface 107 using a known method such as masking so that metal plating is not applied.

〔Effect of the invention〕

According to the flat cathode ray tube display device of the present invention, a groove is provided in the back plate directly under the linear cathode, and a new space is formed in the groove, so that heat from the linear cathode is absorbed by the back plate. There is no need to apply unnecessary heating voltage to the linear cathode, and local overheating of the linear cathode can be prevented. It also becomes possible to sufficiently release carbon dioxide gas when activating the linear cathode.

Therefore, the power consumption of the linear cathode can be reduced,
Furthermore, it is possible to provide a flat cathode ray tube display device that can prevent the linear cathode from breaking and has high reliability.

[Brief explanation of drawings]

1(a) and 1(b) are perspective views showing one embodiment of the present invention, FIG. 1(c) is a parts diagram of FIG. 1(b), and FIG. 2 is a sectional view of essential parts of the present invention, FIG. 3(a) is a perspective view showing a conventional flat panel cathode ray tube display device, and FIG. 3(b) is a perspective view of a conventional flat-type cathode ray tube display device.
It is an enlarged view of the main part. 101 C back plate, 102 C groove, 103, 104 C m'tx pole, 105 linear cathode, 106 pedestal, 107
108 is a sealing surface, 108 is a recess, 109 is a back electrode, 110 is a linear cathode locking means, 111 is a linear cathode extending means, 112
113 is a positioning means, and 113 is an electrode terminal Patent applicant: Furukawa Electric Co., Ltd. Figure 1 (C) 207 Metal plating Figure 2 Figure 6 (b)

Claims (1)

[Claims] A plurality of linear cathodes arranged on the same plane, an extraction electrode arranged above the linear cathodes and at a constant distance from the linear cathodes, and below the linear cathodes. , and a plurality of striped control electrodes provided on a back plate made of an insulator in a direction perpendicular to the longitudinal direction of the linear cathode extension, and a plurality of striped control electrodes provided above the extraction electrode and sandwiching the linear cathode. In a flat cathode ray tube display device comprising a vertical deflection electrode disposed on a vertical deflection electrode, and a screen having an anode formed on the inner surface of a front plate and integrated with a phosphor, the area immediately below the longitudinal direction of the linear cathode. A flat cathode ray tube display device, characterized in that a groove is provided in the back plate at a location corresponding to the space to form a space.