JPH01195641A - Image display device - Google Patents

Abstract

PURPOSE:To eliminate intensity irregularities and prevent an open circuit by supporting a linear cathode with a groove section and insulating supporters having a taper and bringing it into contact with insulators provided outside an image display section and inside the insulating supporters. CONSTITUTION:Insulators 17a and 17b are provided in contact with a back electrode 15, the distance between a linear electrode 11 and the back electrode 15 or a control electrode 13 is maintained by the contact with its contact with the outer diameter. The insulators 17a and 17b are provided outside an image display section and inside insulating supporters 12a and 12b and in contact with the linear cathode 11. A groove section 19 is provided on the insulating supporter 12b, a taper 20 is also provided. The occurrence of intensity irregularities is thereby eliminated, the insulating supporters have tapers, their contact areas with the linear cathode are reduced, thus causing no contact resistance, the linear cathode is not opened.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an image display device for video equipment.

Conventional technology Conventionally, cathode ray tubes have been mainly used as display elements for displaying color television images, but conventional cathode ray tubes have a much longer depth than the screen, making it difficult to manufacture thin television receivers. It was impossible to do so.

In addition, recently, FI display elements and plasma display elements are used as flat display elements.

Although liquid crystal display elements and the like have been developed, all of them are insufficient in terms of performance such as brightness, contrast, and color reproducibility of color display, and it will take time to put them into practical use.

Therefore, we aimed to achieve a device that can display color television images on a flat display device using electron beams, and we divided the screen on the screen vertically into multiple sections. Each time, the electron beam is deflected vertically to display multiple lines, and
Divide into multiple sections horizontally and set R, G, B for each section.
The R, G, B phosphors are made to emit light sequentially, and
The irradiation meter for emitting an electron beam to a phosphor such as the above is controlled by a color video signal, thereby forming a television image display device as a whole.

An example of the conventional image display device mentioned above will be described below with reference to the drawings. 3 and 4 show conventional image display devices. In FIG. 3, 1 is a line cathode as an electron beam source, 2a and 2b are support stands that support and fix both ends of the line cathode, 3 is a mesh-like control electrode, 4 is a phosphor, 5 is a back electrode, ea , eb is a container, and 7 is a spring that applies a load to the wire cathode 1 and stretches it.

The operation of the image display device configured as described above will be described below. Line cathode 1 as electron beam source
is suspended in the horizontal direction by plate springs 7 attached to support stands 2a and 2b so as to generate an electron beam distributed linearly in the horizontal direction, and a plurality of such linear cathodes 1 are connected at appropriate intervals. (Only 7 are shown here).

As shown in an enlarged view in FIG. 4, the wire cathode 1 is supported by an insulating support 2b fixed to a back electrode 5 and fixed by a plate spring 7. The spacing between the line cathode 1, the control electrode 3, and the back electrode 5 is important, and for this reason, while measuring the dimensions using an optical measuring device, etc., the grooves 8 are measured at one location and several micrometers at each location.
It is processed within an error of less than m. These wire cathodes 1 are constructed by coating the surface of a tungsten wire with a diameter of 10 to 20 μm with an oxide cathode material.

Then, it is controlled by a control pulse so as to sequentially emit an electron beam for a fixed period of time, and a heat current is applied at times other than the fixed period of time to raise the temperature to generate an electron beam.

Furthermore, at the start, the line cathode 1 is loaded with the electron beam emission control pulse and heat current at the same timing. The back electrode 5 suppresses generation of electron beams from other line cathodes 1 other than the line cathode 1 which is controlled to emit electron beams at fixed time intervals, and pushes out the generated electron beams only in the forward direction. act.

The mesoche-shaped control electrode 3 is passed through horizontally long slits facing each of the line cathodes 1, and at the same time is deflected vertically or horizontally. Also, a round hole may be used instead of the slit.

The phosphors 4 are provided with one pair of phosphors in three colors, R, G, and B, for each horizontally divided electron beam, and are coated in stripes in the vertical direction. ing.

And containers 6 &+ 6 b into which these component parts are divided
After being compressed inside, it is sealed with a frit or the like to maintain the internal vacuum.

Problems to be Solved by the Invention However, as mentioned above, in the above configuration,
The distance between the line cathode 1, the control electrode 3, and the back electrode 6 is important, and there is a drawback that unevenness in brightness occurs due to an error in this distance.In order to regulate this distance, one groove is machined. work efficiency is poor. Moreover, since the contact area of the groove portion is large, the wire cathode 1 is extremely thin and has the disadvantage of being easily broken.

In view of the above drawbacks, the present invention eliminates uneven brightness, which is an image defect, because the distance between the wire cathode 1 and the control electrode 3 can be easily regulated, and furthermore, since the contact area of the groove is small, wire breakage is eliminated. The present invention provides an image display device that has the following features.

Means for Solving the Problems In order to solve the above problems, the image display device of the present invention includes:
A wire cathode is supported by an insulating support having a groove and a taper, and is brought into contact with an insulator provided outside the image display section and inside the insulating support.

Operation The present invention has the above-described configuration in which the distance between the line cathode and the control electrode or the line cathode and the back electrode is regulated by bringing an insulator into contact with the line cathode, and the position of the gap between the line cathodes is regulated by the groove. This eliminates the occurrence of uneven brightness, and since the insulating support has a taper to reduce the contact area of the wire cathode, there is no contact resistance and the wire cathode does not break. There will be no image defects due to disconnection.

Embodiment Hereinafter, an image display device according to an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, 11 is a conductive wire cathode coated with a material having thermionic emission function such as barium oxide, and 121L and 12b are this wire cathode 1.
1 is an insulating support that supports and fixes both ends of the line cathode 11; 13 is an electrode that controls the beam emitted from the line cathode 11 to form a predetermined image; A phosphor that emits light and displays an image; 15 is a back electrode installed to facilitate the generation of thermoelectrons from the linear cathode 11; 16a and 16b are containers; 17 & + 1 is in the height direction of the linear cathode 11; The insulator 18 is a spring that applies a load to the wire cathode 11 and stretches it.

In FIG. 1, the insulator 17a is in contact with the back electrode 15.
, 17b are provided, and the distance between the wire cathode 11 and the back electrode 15 or the control electrode 13 is maintained by contact with the outer diameter of the wire cathode 11. Also, an insulator 17a.

The second
It is in contact with the strip cathode 11, which is shown enlarged in the figure. This insulating support 12b is provided with a groove 19 and also has a taper 2o. This groove portion 19 has a V-shaped cross section or the like, and is machined while maintaining only the spacing between the wire cathodes, and the groove depth does not need to be machined with a precision of several μm as in the conventional method.

That is, the height spacing is determined by contacting the insulator 17b, and the line spacing is determined by the groove.

Further, since the taber 2o is provided, the contact area between the wire cathode 11 and the insulating support 12b is also minimized, and the contact resistance can be reduced. The wire cathode 11 is fixed by stretching the wire cathode 11 under tension and fixing it to the spring 18.

The image display device is completed by assembling the control electrode 13 on the assembled back electrode 16 and sealing it with the containers 16a and 16b.

Effects of the Invention As described above, the present invention supports a wire cathode with an insulating support having a groove and a taper, and supports an insulator provided outside the image display area and inside the insulating support. The distance between the back electrode and the line cathode or between the line cathode and the control electrode can be regulated by contact, and furthermore, since the position of the line cathode interval is regulated by the groove of the insulating support, uneven brightness can be prevented. Since the insulating support has a taper and the contact area of the wire cathode is reduced, there is no resistance and there is no disconnection, so an inexpensive image display device without image defects can be provided. Wow

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an image display device according to an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of the main parts thereof, and FIG. 3 is a partially cutaway perspective view showing a conventional one-plane image display device. , FIG. 4 is an enlarged sectional view of the main part. 11... Line cathode, 12&, 12b...
Insulating support, 13... Control electrode, 14...
...Fluorescent material, 16 ...Back electrode, 1γa, 17b
...Insulator, 19...Groove. Name of agent: Patent attorney Toshio Nakao and 1 other person

Claims (1)

[Claims] It has a line cathode that emits electrons, a control electrode that controls the flow of electrons, a phosphor that can receive the electrons and emit light, and a back electrode that is provided to cause the electrons to be emitted from the line cathode. , the wire cathode is supported by an insulating support having a groove and a taper, and is in contact with an insulator provided outside the image display section and inside the insulating support. image display device.