JPS59146139A - Picture image display device - Google Patents

Abstract

PURPOSE:In a picture display device employing a plurality of linear hot-cathodes, to reduce deterioration of picture quality due to vibration of linear cathode while to obtain a display of uniform brightness, by arranging an insulator support for supporting the linear cathode between the rear side electrode and electron beam take-out electrode. CONSTITUTION:A plurality of linear hot-cathodes 20 are provided where electron beam is taken out by an electron beam take-out electrode 22 and a picture is displayed. A rear side electrode 21 is provided while facing with the electrode 22 through the cathode 20. The electrode 22 is provided with a plurality of through-holes 22a arranged coaxially with the cathode 20 where negative pulse voltage is applied at one end of cathode 20 while a diode 24 is connected to the other end. The cathode 22 is applied with voltage which is positive against the cathode 20. Insulated wire 25 such as insulated metal wire or glass fiber is arranged perpendicularly with the cathode 20 to support the cathode 20. At least one end of said wire 25 is stretched by a spring member which is secured to the electrode 22 or 21.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an image display device using a linear hot cathode, and particularly to image quality problems such as flickering and shaking of the screen due to vibration of the linear hot cathode during operation of the image display device. The present invention relates to a specific electrode configuration to reduce the decrease in .

Conventional Structure and Problems Fluorescent display tubes have been put into practical use as display devices using linear hot cathodes. These take out the electron beam from a linear hot cathode using a mesoche-like electrode, and form a dot-like number 1 using mesoche electrodes and phosphors arranged in 7 trixes.
It is used to display characters, etc. One end of the linear hot cathode of this display tube is fixed at a fixed position, and the other end is suspended in space by a spring member while maintaining a constant spacing. Therefore, the linear hot cathode vibrates due to its natural frequency, causing uneven brightness and flickering of the phosphor in the display section. For this reason, in fluorescent display tubes, etc., insulators such as mica are placed at intervals in the longitudinal direction of the linear cathode to increase the natural frequency and prevent unnaturalness from appearing to the human eye. ing. However, a configuration in which an insulating material such as mica is disposed is not suitable for high-resolution display because the temperature near the linear cathode mica decreases significantly and the disturbance of the electric field increases.

Purpose of the Invention We have previously proposed an image display device aimed at displaying high-resolution images. The present invention proposes a specific configuration for reducing the deterioration in image quality caused by the vibration of the linear cathode, which similarly occurs in the image display device.

Structure of the Invention In the image display device of the present invention, an insulating material support is disposed perpendicularly to the linear hot cathode in order to reduce the vibration of the linear hot cathode. Specifically, an insulated wire made of glass fiber or metal wire coated with an insulator is perpendicular to the linear hot cathode.
, and is arranged so as to be sandwiched between phase q. Both ends or one end of the insulator support are stretched with spring materials, and current is applied to the insulator-coated metal wire as needed.
It is characterized by heating.

DESCRIPTION OF THE EMBODIMENTS The linear cathode portion of the image display device that we have proposed above will be described below. In FIG. 1, reference numeral 1 denotes a back electrode in which a transparent conductive film such as In 203 is provided on the inner surface of a glass plate. A plurality of linear cathodes 2 are arranged on the same plane at the same intervals. At least one end of the linear cathode is fixed by a spring member so that tension is applied to the linear cathode. Reference numeral 3 denotes an electron beam extraction electrode, which has a plurality of through holes 3a disposed on the same side as the linear cathode. A negative pulse voltage is applied to one end of the linear cathode, and the other end is connected to a diode. A voltage of 5, . . . , which is positive with respect to the cathode, is applied to the electron beam extraction electrode. When a negative pulse is applied to the linear cathode 2 and the lower back electrode 1 and the electron beam extraction electrode 3 are set to non-optimal conditions, the electron beam advances toward the electrode 3, passes through the through hole 3a provided in the electrode 3, and reaches the anode. Proceed towards. At this time, as mentioned above, the linear cathode is considered to be one string, so the linear cathode vibrates due to natural vibration.
The distance between the back electrode 1 and the electron beam extraction electrode 3 changes, and the amount of electron beam passing through the through hole changes at any given time. Generally, the natural frequency of a string is expressed as f=2JT. Here, l can be considered as the length of the linear cathode, ρ as the mass per unit length, and T as the tension applied to the linear cathode. In other words, the only way to increase the natural frequency of the linear cathode is to increase the tension in the same configuration.

Another method of the present invention is to substantially shorten the length of the linear cathode and increase the frequency by arranging an insulator perpendicular to the linear cathode.

The basic structure of the invention is shown in Book 6, La, which explains the details of the invention using drawings. In the figure, 21 is a back electrode. 20 is a linear cathode.

22 is an electron beam extraction electrode. 26 is an insulated wire such as an insulated metal wire or glass fiber used in the present invention. The insulated wire 4 is arranged perpendicular to the linear cathode. In FIG. 2, the insulated wires are used one at a time at intervals, but they can also be arranged so as to be sandwiched between two wires as shown in FIG. 3. At least one end of the insulated wire is stretched by a spring member.

The spring material is fixed on the electron beam extraction electrode or the back electrode by spot welding, frit glass, or the like. It is also possible to form the insulated wire by applying an insulating material such as frit glass to a high melting point metal wire such as a tungsten wire by electrodeposition or the like.

Effects of the Invention The image display device prototyped with the configuration described above alleviates the deterioration of image quality due to vibration of the linear cathode, and prevents temperature unevenness and electric field unevenness of the linear cathode, and thus achieves uniform brightness. An image display device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the basic configuration of an electron source of a conventional image display device, FIG. 2 is a perspective view showing the basic configuration of the device of the present invention, and FIG. 3 is a perspective view showing another embodiment of the device of the present invention. FIG. 20... Linear cathode, 21... Back electrode, 2
2... Electron beam extraction electrode, 26...
・Insulated metal wire.

Claims (1)

[Scope of Claims] (1) A plurality of linear hot cathodes, an electron beam extraction electrode for extracting electron beams from the linear hot cathodes, and an electron beam extraction electrode for extracting electron beams from the linear hot cathodes; It has a back electrode provided opposite to the beam extraction electrode, and an insulator support for supporting the linear hot cathode is disposed between the back electrode and the electron beam extraction electrode. image display device. (2) The image display device according to claim 1, wherein the insulating material support is made of a metal wire or glass fiber whose surface is insulated. (3) The image display device according to claim 1, wherein a plurality of insulating material supports sandwich the linear hot cathode. (4) both ends of the insulator support are fixed to the back electrode or the electron beam extraction electrode via supports with spring action, The image display device according to item 2 or 3. (6) The image display device according to claim 1, wherein when the insulator support is a metal wire covered with an insulator, the insulator support is energized.