JPH0588499B2 - - Google Patents

Description

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

[Conventional technology]

To briefly explain this type of conventional device, in a flat matrix CRT, the display section is generally a rectangular face plate on which phosphor is deposited as display pixels, and a rectangular face plate is formed on the back side of the face plate along the shape. A vertical spacer glass is welded to the back of the spacer glass, and a bottom plate glass is further welded to the back surface of the spacer glass to form a vacuum inside. Inside this vacuum, there is a filament that becomes 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 faceplate to emit predetermined information. It is placed towards the side.
A low voltage is applied to these filaments and the X and Y grids via low voltage pins and lead wires connected to these 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 phosphor so that the thermoelectrons directed toward the phosphor are not diffused to other adjacent phosphors. Therefore, a phosphor that is not bombarded by thermionic electrons does not emit fluorescence, and the flat matrix
CRTs display fluorescent images with good contrast. At this time, a high voltage is applied to each of the phosphors of 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 controls ON/OFF of thermoelectrons, and the Y grid plays the role of an electron lens.

[Problem to be solved by the invention]

In conventional flat matrix CRTs, the high voltage lead wires applied to the face plate and low voltage lead wires such as filament wires are connected to high voltage pins and low voltage pins arranged in a circular shape on a plug attached to the back of the bottom plate glass. It is structured as follows. However, in the past, high voltage was applied to the wiring connecting each phosphor of the face plate through a lead wire connected to the center of the wiring. For this reason, the lead wire pulled out from the center of the bottom plate glass to the back side of the plug detoured outward inside the plug and was connected to the high voltage pin that formed part of the circular shape off the center. This leads to problems in that 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 specifically proposes a flat matrix CRT in which the lead wires for applying high voltage are shortened.

[Means for solving problems]

In this invention, a high-voltage pin that applies high voltage is attached to the center of the bottom plate glass, and a lead wire is led from the center of the face plate to the high-voltage pin along the axis of the flat matrix CRT to connect the two. This is a CRT.

[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 plate glass instead of having to take a detour as in the conventional case, making it possible to further prevent electric leakage and assembling. The attachment work can be simplified.

〔Example〕

Hereinafter, the present invention will be explained based on the illustrated embodiments. In the figure, 1 is a face glass, 2 is a phosphor adhered to the inner surface of the face glass 1, and, for example, the face glass 1 has a 4×4 matrix structure in the vertical and horizontal directions. is covered with. These fluorescent bodies 2 are connected by a conductor 3, and a lead wire 5 connected to a high voltage pin 4 is connected at the center thereof. Although not shown, a transparent lacquer is coated on the inner surface of the face glass 1 together with the phosphor 1, and aluminum is deposited on the upper surface of the phosphor 1.
The face plate is formed by the aluminum coating. 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 is formed by the face plate, the spacer glass 6, and the bottom plate glass 7. Space V ₁ is maintained in a vacuum state. 8 is a plug fixed to the bottom plate glass 7, and this plug 8
A protrusion 8a is formed at the center, a high voltage lead wire 5 passes along this axis, a glass tube 9 surrounds the outside thereof, passes through the bottom glass 7, and the outer end of the glass tube 9 is welded. The space V ₁ is closed off. 1
0 is a lead wire pulled out from an X grid and a Y grid (both not shown) attached to the inner surface of the bottom plate glass 7, and this lead wire 10 once goes inside from the outer periphery of the plug 8, and is connected to the outer periphery of the protrusion 8a of the plug. It is connected to a low voltage pin 11 arranged so as to form a circular shape. Further, a circular protrusion 8b is formed inside the plug 8 and is in close contact with the bottom plate glass 7, thereby isolating the high voltage lead wire 5 and the low voltage lead wire 10. Note that a projection 8 is provided in the space V ₂ formed between the plug 8 and the bottom plate glass 7.
An insulating filler is filled through the perforated hole 8c on the side of a to prevent leakage of high voltage. Further, 12 is a shielding plate that prevents 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 length, thereby preventing high voltage leakage. In addition to being able to significantly suppress the degree of damage, the wiring work can be simplified. Moreover, since the lead wire 5 has a short dimension, the probability of failure can be suppressed.

[Effects of the Invention] As is clear from the above explanation, since the high voltage pin for applying high voltage to the face plate, which is the anode electrode, is attached to the center of the plug, leakage of high voltage can be prevented, and the assembly The efficiency of attachment work can be improved.

Further, since the low voltage pin is arranged near the high voltage pin, the dimensions of the socket into which the high voltage pin and low voltage pin are inserted can be reduced, the space for installing the socket can be reduced, and the installation work is simplified. Further, since the low voltage pin goes inside the plug and the other end is connected to the low voltage lead at the end of the plug, there is no problem with insulation. Further, by providing the protrusion on the plug so as to surround the high voltage pin, the insulation between the high voltage pin and the low voltage pin can be improved, and the low voltage pin can be placed closer to the high voltage pin.

[Brief explanation of the drawing]

The figure shows a flat matrix CRT according to this invention.
FIG. In the figure, 1 is a face glass, 2 is a phosphor, 1 and 2 are face plates, 4 is a high pressure pin,
5 and 10 are lead wires.

Claims (1)

[Scope of Claims] 1. A face plate having a phosphor formed in a matrix, a spacer member welded along the outer circumference of the face plate, a spacer member welded to the spacer member facing the face plate,
A bottom plate that forms a vacuum vessel with the face plate and spacer member, a plug made of an insulating member fixed to this bottom plate, a high voltage pin planted in the center of this plug, and a phosphor in the matrix shape, respectively. a high voltage lead wire that is connected to the center of the face plate, passes through the center of the vacuum vessel, and is connected to the high voltage pin via the center of the bottom plate;
A plurality of low voltage leads, one end of which is connected to a filament that generates thermionic electrons or a grid that controls the flight area of thermionic electrons to the phosphor, and the other end of which is drawn out from the outer peripheral end of the bottom plate; A flat matrix CRT characterized by comprising a plurality of low voltage pins arranged near the high voltage pins and implanted in the plug, extending inside the plug and having the other end connected to the low voltage lead at the outer peripheral end of the plug. . 2. A face plate on which a phosphor is deposited in a matrix, a spacer member welded along the outer circumference of the face plate, a spacer member welded to the spacer member facing the face plate,
A bottom plate that forms a vacuum vessel with the face plate and spacer member, a plug made of an insulating member fixed to this bottom plate, a high voltage pin planted in the center of this plug, and a phosphor in the matrix shape, respectively. a high voltage lead wire that is connected to the center of the face plate, passes through the center of the vacuum vessel, and is connected to the high voltage pin via the center of the bottom plate;
A plurality of low voltage leads, one end of which is connected to a filament that generates thermionic electrons or a grid that controls the flight area of thermionic electrons to the phosphor, and the other end of which is drawn out from the outer peripheral end of the bottom plate; A plurality of low voltage pins are placed near the high voltage pins and implanted in the plug, and the other end is connected to the low voltage lead at the outer peripheral end of the plug, and is formed in the plug so as to surround the high voltage pin. A flat matrix characterized by having a protrusion
CRT.