JPS62150634A - Flat matrix cathode-ray tube - Google Patents

Abstract

PURPOSE:To make it possible to prevent a leakage of a high voltage and to realize an efficient assembling, by furnishing a high voltage pin to apply a high voltage to a face plate which is an anode, at the center of a plug. CONSTITUTION:A high voltage pin 4 is installed at the projection 8a formed at the center of a plug 8. Therefore, a lead wire 5 through which a high voltage is applied to a face plate 1 can be made shortest. Consequently, the leading rate to apply the high voltage can be restricted broadly, and the wiring can be simplified. Furthermore, because of the shortest lead wire 5, the trouble- making rate can be limited.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flat matrix CRT forming a display screen of a large-sized image display device.

[Conventional technology]

To briefly explain this kind of conventional device, a flat matrix CRT generally has a phosphor deposited thereon as display pixels, and then a rectangular face plate serves as the display section.
A spacer glass that follows the shape of the face plate is welded to the back side of the face plate, and a bottom plate glass is further welded to the back side of the spacer glass to form a vacuum inside.

Inside this vacuum, there is a filament that serves as a cathode electrode that generates thermoelectrons, and an X grid and a Y grid that accelerate the generated thermoelectrons and collide with the phosphor of the face plate to emit predetermined information. It is placed facing the plate side.

A low voltage is applied to these filaments and the X and Y grids via low voltage pins and lead wires connected thereto to generate hot electrons in the filaments, which are selectively applied to each of the X and Y grids. This allows the thermoelectrons to collide only with predetermined phosphors. A shielding plate is attached to the back side of each of the fluorescent lights 2', -lζ to prevent the thermionic electrons heading toward the fluorescent body from being diffused to the adjacent fluorescent bodies. Therefore, a phosphor that is not bombarded by thermionic electrons does not emit fluorescent light, and the flat matrix CRT displays fluorescent light with good contrast. At this time, a high voltage is applied to each of the phosphors on the face plate, each of which is used as an anode electrode, so that it can always emit a predetermined color due to the collision of thermoelectrons. Note that the X-grid is thermionic ON.

OFF control, and the Y grid plays the role of an electron lens.

[Problem that the invention seeks to solve]

In conventional flat matrix CRTs, the high voltage lead wires applied to the face plate and the low voltage lead wires such as filament wires are attached to the back of the bottom plate glass and connected to nine plugs in a circular shape.
They are arranged in a shape and connected to a high voltage pin and a low voltage pin. However, in the past, high voltage was applied to the wiring connecting each phosphor on the face plate through a lead wire connected to the center of the wiring. For this reason, the lead wire was pulled out from the center of the bottom glass to the back side of the plug, bypassed the inside of the plug toward the outside, and was connected to a high-voltage pin that formed part of a circular shape off the center. The lead wires become longer, the degree of high voltage leakage increases, the assembly workability is poor, and failures related to the lead wires are more likely to occur.

This invention was made to solve the above-mentioned problems, and particularly proposes a shift flat matrix CRT in which the lead wires for applying high voltage are shortened.

[Friendly means of solving problems]

This invention constructs a flat matrix CRT by attaching a high voltage pin that applies a high voltage to the center of the bottom plate glass, leading a lead wire to the high voltage pin at the center of the face plate along the axis of the flat matrix CRTO, and connecting the two. This is what I did.

[Effect]

According to this invention, the lead wire for applying high voltage can be simply connected between the center of the face plate and the center of the bottom glass instead of having to take a detour as in the conventional case, thereby further preventing electrical leakage. Assembly can achieve work simplification.

〔Example〕

Hereinafter, the present invention will be explained based on the illustrated embodiments. In the figures, (1) is a face glass, (2) is a phosphor coated on the inner surface of the face glass (1). ) are deposited in a 4X4 matrix structure vertically and horizontally. And between these fluorescent bodies (2) is a conductor (8)
connected by a high voltage pin (4) at its center
A lead wire (5) is connected thereto.

Furthermore, although not shown, a transparent lacquer is coated on the inner surface of the face glass (1) together with the phosphor (1), and aluminum vapor deposition is performed on the upper surface of the phosphor (1). , transparent lacquer, and aluminum coating to form a faceplate. (6
) is a spacer glass welded along the shape of the face plate, (7) is a bottom plate glass welded to the spacer glass facing the face plate, and these face plate, spacer glass (6) and bottom plate glass (
The space (V-shaped space) formed by 7) is maintained in a vacuum state. (8) is a plug fixed to the bottom plate glass (γ), a protrusion (8a) is formed at the center of this plug (8), and a high voltage lead wire (6) is passed along this axis.
A glass tube (9) surrounds the outside, and a bottom plate glass (γ) passage portion is welded to seal the space (V-shaped). αO is the X grid attached to the inner surface of the bottom glass (γ), Y
A lead wire is drawn out from the grid (both not shown), and this lead wire once goes inside the plug (8) from the outer periphery, and is arranged so as to form a circular shape around the outer periphery of the protrusion (8a) of the plug. Connected to the low voltage pin (11). Further, a circular protrusion (8b) is formed on the inside of the plug (8) and is in close contact with the bottom plate glass (γ), thereby isolating the high voltage lead wire (5) and the low voltage lead wire αQ. In addition, in the space (v2) formed between this plug (8) and the bottom plate glass (a), there is a hole (8) formed in the side eave of the projection (8a).
C) is filled with an insulating filling to prevent high voltage leakage. In addition, (increase) is a shielding plate that prevents the diffusion of thermoelectrons.

According to the above configuration, since the high voltage pin (4) is attached to the protrusion (8a) formed at the center of the plug (8), the lead wire (5) for applying high voltage to the face plate can be kept to the shortest size. Therefore, it is possible to significantly suppress the degree of high voltage IJ + interference, and to simplify the wiring work. Moreover, the lead wire (5)
Since it has short dimensions, the failure rate can be reduced.

〔Effect of the invention〕

As is clear from the above explanation, attaching the high voltage pin for applying high voltage to the face plate of the anode electrode at the center of the plug prevents high voltage leakage, and also prevents the assembly of the high voltage pin. Work efficiency can be improved.

[Brief explanation of drawings]

The figure is a sectional view showing the main parts of a flat matrix CRT according to the present invention. In the figure, (1) is the face glass, (2) is the phosphor, (1) and (2) are the face plate, and (4) is the high voltage pin %t5)#αQ is the lead wire.

Claims (1)

[Claims] A high-voltage pin that applies a high voltage to the phosphor formed in a matrix on the face plate is attached to the center of the plug through lead wires, and thermionic electrons are generated in the filament, and these thermionic electrons are transferred to the phosphor. A flat matrix CRT characterized in that a plurality of low voltage pins for applying low voltage to the filament and the grid through lead wires are provided on the periphery of the plug surrounding the high voltage pin so as to control the flying area of the filament and the grid by the grid.