JP3106799B2 - Flat panel image display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a television receiver,
The present invention relates to an electrode support device for a flat panel type image display device used for a computer terminal display or the like.

[0002]

2. Description of the Related Art In recent years, developments relating to thinning of a color image display device have been actively carried out.
Japanese Patent Application Laid-Open No. 3-674 discloses a flat-panel image display device of the beam scanning type in which the distance from the cathode to the anode is significantly reduced.
No. 44 and others. This divides the screen on the screen into a plurality of sections in the vertical direction, deflects the electron beam vertically for each section, displays a plurality of lines, and further divides the screen horizontally into a plurality of sections. The R, G, and B phosphors are sequentially emitted for each section, and the amount of electron beam irradiation on the R, G, and B phosphors is controlled by a received color video signal, so that the whole To display a television image.

[0003] For this purpose, such a flat panel type image display device comprises an electrode unit in which the distance from the cathode to the anode is extremely short in a flat box type vacuum vessel and a linear hot cathode (hereinafter, referred to as a wire) serving as an electron beam generating source. (Referred to as a cathode). This electrode unit is provided with small-diameter holes and slits for deflecting, converging, and controlling the electron beam emitted from the linear cathode, and the electron beam controls the holes and slit portions of each of the electrodes while controlling them. After passing through, the anode is accelerated and struck, and the phosphor applied to the anode is caused to emit light to display an image.

FIG. 4 is a sectional perspective view showing the internal structure of the flat panel display. In the drawing, 1 is a back electrode, 2 is a linearly extended linear cathode (only four are illustrated here), 3 is an electron beam extraction electrode, and 4 to 8 are signal control, focusing, deflection and the like. It is an electrode group that works. The electrode unit 11 is formed by superposing these plate-shaped surface electrodes 3 to 8 via an insulator. Reference numeral 12 denotes an electron beam extraction hole in the electron beam extraction electrode. Reference numeral 13 denotes an electron beam emitted from the linear cathode 2. The electron beam is apparently led into one electron beam by the hole 12 of the electron beam extraction electrode. The electrodes 4 to 8 are controlled, focused, and deflected to scan the anode and the small section 14 of the screen section. 9 is the flat box-shaped front glass container. The inner screen part 15 of the front glass container 9 has R,
G and B phosphors are printed and applied, and the electron beam 13
Causes an image portion to be projected on the small section 14 of the screen section, and similarly, the other electron beam causes all the small sections, such as the other small sections 16, to emit light to project a desired image on the entire screen. 10 is a back container, and a front glass container 9
After the sealing, the inside is evacuated to form a flat panel type image display device.

FIG. 5 is an external perspective view of a sealed flat panel type image display device. 9 is a front glass container, 10 is a back container, and these are fired and sealed with frit glass. 17 is an exhaust pipe for drawing a vacuum in the container, 18 is a high voltage terminal of the anode,
Reference numeral 19 denotes a control external extraction terminal for various electrodes constituting the electrode unit. By connecting a drive circuit, a signal processing circuit, and the like externally to these terminal groups, the flat-panel image display device exhibits its function as a television receiver or a display device.

FIG. 6 is an external perspective view of a flat-panel type image display device in which a part of the front container shown in FIG. The electrode unit 11 includes a fixing screw 20 and the fixing screw 2 provided at a predetermined position of the back container electrode 10.
The fixing screw seat 21 is fixed to the back container.

[0007]

The electrode unit 11 shown in FIG. 6 is fixed by a fixing screw 20 and a tightening screw seat 21. In the process of manufacturing the flat panel type image display device, the electrode unit incorporated therein is used. The unit is exposed to high temperatures several times. For example, when the front container 9 and the back container 10 are sealed, the melting temperature of the frit glass becomes several hundred degrees Celsius, and the vacuum is also drawn in a high-temperature furnace, and the getter flash (not shown in the present specification). It is the electron beam extraction electrode 3 that is most susceptible to these thermal repetitions, such as local high-frequency heating during heating and energizing heating of the line cathode during driving. Despite sufficient consideration of the thermal characteristics of these components during design, the combination of a glass substrate and a metal plate still causes slight deformation due to thermal distortion due to the characteristics of each material, leading to deterioration in image quality of images. was there.

FIG. 7 shows the deformation due to the thermal strain in an exaggerated manner by a dotted line 23. In this case, since the parallel space between the linear cathode 2 and the electron beam extraction electrode 3 changes, the uniform electron beam extraction over the entire screen is affected, so that the sharpness of the image and the uniformity of the electron beam are reduced. Deterioration was the biggest issue.

[0009]

Means for Solving the Problems Conventionally, a wire cathode is stretched over a back container via a wire-cathode stretching support base, and an electrode unit is fixed to the back container via a separate support. Protrusions are provided between the wire-cathode stretching pitches of the support for supporting the cathode so that the lower surface of the electron beam extraction electrode is in contact therewith, and the screw screw seat for fixing the electrode unit by a fixing screw is also the wire cathode. The electrode unit was molded integrally with the supporting base for stretching and the electrode unit was fixed to the supporting base for linear cathode mounting with fixing screws.

[0010]

According to the above means, the electrode unit,
In particular, since the lower surface of the electron beam extraction electrode is brought into contact with a plurality of projections having a constant height on the plurality of upper surfaces connected to the support for wire-cathode stretching, and the electrode unit is also fixed to the same support with fixing screws. In addition, the effect of forcibly suppressing the generation of strain on the electrode plate due to a change in heat occurs.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment according to the present invention is shown in FIGS.

FIG. 1 is a cross-sectional view of a flat panel type image display device cut perpendicularly to a direction in which a line cathode is stretched. The support 24 for wire-cathode stretching is a horizontal and parallel stretching pitch position support for wire-cathode wire stretching, and also controls the deflection of the electrode plate by the projections 25 to maintain the parallelism with the wire cathode surface. Along with
The fixing unit 20 has a function of holding the electrode unit to the rear container 10 with the stretched wire cathode with high accuracy. For this reason, the wire-cathode suspension support 24 is made of an insulator having little thermal distortion. Here, a ceramic material is used.

FIG. 2 is a perspective view of a part of the wire cathode supporting base 24 as viewed from a bird's-eye view, 2 is a stretched wire cathode, 3 is a virtual view of an electrode unit to be mounted, and 25 is an electrode. These are protrusions that come into contact as a unit receiver. Reference numeral 26 denotes a fixing screw insertion hole to be attached to the back container together with the electrode unit.

FIG. 3 is a side view showing a state in which the support 24 for extending the wire cathode is attached to the back container 10. The wire cathode 2 is provided with a spring 30 via a projection 30 for controlling the stretching height of the wire cathode. The electrode unit 11 including the electron beam extraction electrode 3 is mounted on the projection 25 while being welded together with the spring 27 while being urged in the direction of the arrow A by the arrow 27, and the linear cathode 2 and the electron beam extraction electrode 3 Is accurately held in a parallel position.

Reference numeral 28 denotes a mounting washer for fixing the wire-cathode mounting support base 24 to the back container 10 by frit glass. A mounting screw portion is provided at the center of the mounting washer. .

[0016]

According to the above construction, the line cathode 2 and the electron beam extraction electrode maintain a high degree of plane parallelism, and the high temperature heat change during the sealing of the container, the evacuation step or the getter flash, and the like. Able to overcome the effects of thermal strain on the heat radiation from the line cathode, etc., and ensure uniformity of electron emission from the line cathode over the entire surface, resulting in an extremely high effect on image quality improvement. It is.

[Brief description of the drawings]

FIG. 1 is an assembled side view of an electrode unit and a support for a linear cathode overhang in a flat panel display according to an embodiment of the present invention.

FIG. 2 is a perspective view of a support for a wire-cathode bridge in the apparatus.

FIG. 3 is a side cross-sectional view showing the mounting state of the wire-cathode stretching support base, the wire-cathode stretching, and the mounting state of the electrode unit in the apparatus.

FIG. 4 is an exploded perspective view of the device.

FIG. 5 is an external perspective view of the apparatus.

FIG. 6 is a perspective view showing a partially assembled front container of the apparatus and showing an internal assembly state.

FIG. 7 is a side cross-sectional view showing a state in which thermal distortion of an electrode plate occurs in a mounting structure of an electrode unit of a conventional flat panel display.

[Explanation of symbols]

 2 Line cathode 3 Electron beam extraction electrode 9 Front glass container 10 Back container 11 Electrode unit 20 Fixing screw 21 Tightening screw seat 24 Support for wire cathode suspension 25 Projection 26 Tightening screw insertion hole 27 Spring for wire cathode suspension 28 Mounting washer 29 Adhesive frit glass 30 Projection for regulating the height of wire cathode

Claims (2)

(57) [Claims] A line cathode is stretched at a constant pitch and at a constant height, and a portion for fitting a spring for applying a constant tension to the line cathode is provided. In addition, a line cathode support base made of a heat-resistant insulator, having a projection portion for supporting the electron beam extraction electrode in contact with an intermediate portion of the electron beam passage hole array of the electron beam extraction electrode, is provided. A flat panel type image display device characterized by the above-mentioned. 2. A plurality of wire cathodes which are horizontally stretched by a spring and a wire-cathode suspension support, and a projection of the wire-cathode suspension support in order to keep an interval parallel to the wire cathodes. A flat panel type image display device comprising: a thin plate-shaped electron beam extraction electrode held in contact with said flat panel display.