JPS5994343A - Plate type cathode-ray tube - Google Patents

Abstract

PURPOSE:To make a position alignment between an electrode and a phosphor screen ever so easy as well as to reduce the occurrence of chromatic aberration, by installing a position alignment electrode in an interspace between an electron beam forming part, which performs the convergence, deflection and acceleration of the electron beam emitted out of a filamentary heated cathode, and a panel on which the phosphor screen is formed. CONSTITUTION:In order to make an electrode pattern of an electron beam forming part 12 performable for an accurate position alignment with four positioning pins 13 is conformity with each of colors, red, green and blue of a phosphor, a position alignment electrode 14 is inserted into these positioning pins 13 and then locked at the specified position (a position distant away from the phosphor screen as far as uncontacted in between) with a heat resistant bonding agent. Also, in time of forming a phosphor pattern in advance, a pattern of black carbon (black stripe) formed between individual phosphor is made up outside an effective picture screen in advance too, and this pattern is used as a position alignment marker 161. The way to do the position alignment is that, using a microscope or the like, the position alignment marker 161 by the black carbon of a glass plate 15 and a position alingment marker 142 of the position alignment electrode 14 are adjusted right each other.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to televisions, display devices, etc.
The present invention relates to a flat cathode ray tube used for displaying characters and the like.

Conventional Structure and Problems Conventionally, the product names Digitron, Itron, etc. are well known as display tubes that display two numbers, etc. by controlling a low-speed beam to collide with a phosphor. Also, recently,
A display tube has been developed in which an electron beam emitted from a planar cathode is controlled by an xY matrix electrode to display two numbers in the form of a dot. JP-A No. 52-40965.

JP-A-52-54365, JP-A-52-7362
A typical example can be seen in Publication No. 1. These display devices uniformly diffuse electrons emitted from a linear hot cathode over the entire display surface using a grid electrode to which a positive voltage is applied, and control the electron beam using a multi-ratio XY matrix electrode with through holes. The idea is to make the light collide with a phosphor and display it sequentially. In these display devices, since the electron beam is diffused over the entire display surface, the electron beam current density becomes small, which may result in insufficient brightness on the display surface or low brightness, especially when trying to display a large number of characters and numbers. Acknowledge the defects that cause unevenness.

In addition, the XY/IJ hook display method requires twice as many control electrodes as each dot, and therefore the drive circuit becomes complex, and the number of grooved connection terminals increases, resulting in many manufacturing problems. There were drawbacks such as.

Therefore, as a means to solve these drawbacks and 1-, as shown in JP-A-54-143063, JP-A-55-33734, etc., a linear hot cathode and a method in which this is sandwiched. A band-shaped electron beam is obtained by an electron source configured with deflection electrodes facing each other, and a potential difference is applied to the deflection electrodes to perform, for example, vertical scanning.Then, it is deflected horizontally by an electrode, and is deposited on a transparent substrate. A flat cathode ray tube has been proposed that can produce images with high current density and less uneven brightness by emitting light from a plurality of sets of phosphors formed in a flat panel.

A typical structure of this flat cathode ray tube is shown in FIG. In the figure, reference numeral 1 denotes a back electrode, which may be a metal plate, and a metal film is formed on the inner surface of the envelope (not shown) of the cathode ray tube by means such as vacuum evaporation, sputtering or taring. Alternatively, a transparent conductive film may be formed. 2 is a linear hot cathode, which is a tungsten wire with a diameter of 10 to several tens of microns coated with an oxide electron emitting material. Reference numeral 3 denotes a control electrode for extracting an electron beam, and a through hole 3' is provided corresponding to the linear hot cathode 2. The shape, size, and quantity of the through holes 3' are determined by the size of the required electron beam,
Determined according to the electron beam current. Reference numeral 4 denotes an electrode for vertically deflecting the electron beam, and conductive electrodes 4' are formed on both surfaces of the insulating substrate by means such as vacuum evaporation or screen printing. 5 is a control electrode, which has the role of controlling the electron beam current. 6 is an accelerating electrode, 8
is an electrode for horizontally deflecting the electron beam,
It has a comb-like shape. 9 is an accelerating electrode, 10 is a transparent substrate (glass plate), and a phosphor layer 11 is provided on the electrode side.
A metal back layer made of a thin aluminum film is formed to constitute a display surface. The glass container is generally a part of a vacuum container, and a high voltage is applied to the metal back layer together with the accelerating electrode 9. 7 shows the trajectory of the electron beam,
You can't actually see it.

The method described above can provide a high-luminance, high-resolution geometric display device with a simple structure. However, each chamber electrode and the fluorescent surface are manufactured in separate steps and are finally integrated. Therefore, high precision is required for alignment between the electrode and the fluorescent surface, and depending on the precision, it may cause color misalignment of two images of characters, etc.

Purpose of the Invention The present invention was made in view of the above-mentioned problems, and an object of the present invention is to provide a flat cathode ray tube that facilitates alignment between the electrodes and the fluorescent surface and minimizes occurrence of color misalignment. do.

Composition of the invention The present invention focuses an electron beam from a linear hot cathode.

It consists of an electrode for positioning installed between the deflecting and accelerating electron beam forming section and a panel on which a fluorescent surface is formed.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a perspective view of essential parts of a flat cathode ray tube according to an embodiment of the present invention. Reference numeral 12 denotes an electron beam forming section from the back electrode 1 to the acceleration electrode 9-i shown in FIG. 1 (shown as a block to simplify the drawing). In order to position the electrodes with high precision and fix them at predetermined gaps, positioning pins 13 made of an insulator, such as ceramic, are inserted into positioning holes pre-processed with predetermined dimensions at the four corners of each electrode. Each electrode is fixed in the inserted state with a heat-resistant adhesive such as low melting point solder glass. Next, find the positions of these four
3. In order to accurately align the electrode pattern of the electron beam forming section 12 in accordance with the red, green, and blue colors of the phosphor, the alignment electrode 14 is inserted into the positioning pin 13. Then, fix it at a predetermined position (a position away from the fluorescent surface to the extent that it does not come into contact with it) using a heat-resistant adhesive or the like.

The alignment electrode 14 is formed with an opening 141 corresponding to the effective screen so as not to obstruct passage of the electron beam, and alignment pins are inserted into the four corners like each electrode. A predetermined hole is drilled, and a positioning marker 142 is formed in correspondence with the hole. The openings 141, holes, etc. described here are integrally processed by means such as photoetching. Next, a transparent substrate 15 such as a glass plate having holes 151 made in the four corners in the same manner is inserted into the positioning pins 13. At this time, in order to align the phosphor dots or stripes 16 formed on the electrode side of the glass plate 16 and each electrode of the electron beam forming section 12, when forming the phosphor pattern in advance, , black carbon (black stripe) patterns formed between each phosphor are also formed outside the effective screen, and which one is used as the positioning marker 161. The alignment method is
Using a microscope or the like, the alignment marker 161 made of black carbon on the glass plate 16 is aligned with the alignment marker 142 on the alignment electrode 14, and fixed with a heat-resistant adhesive (eg, low melting point solder glass). FIG. 3 shows the fixed state.

In the above embodiments, black carbon was used as the manufacturing method for the positioning marker 161 formed on the transparent substrate 15'2. A pattern may be formed. Furthermore, when aligning the electron beam forming section 12 and the face section 15, we have explained how to drill holes 151 at the four corners of the face section and insert positioning pins into them. The hole does not need to be a through hole, and may be formed halfway in the thickness direction of the transparent substrate 15. The same effect can also be obtained by bonding a cylindrical jig made of metal or insulator for inserting the pins 13 onto the transparent substrate 15.

As described above, the invention provides a positioning electrode mounted on an electron beam forming section that focuses, deflects, and accelerates an electron beam from a linear hot cathode, and a positioning marker formed on the positioning electrode. A flat cathode ray tube in which the face part, which has a phosphor pattern formed on a glass plate, is positioned using alignment markers formed outside the effective screen of the phosphor pattern. The electrode pattern of the forming part can be aligned with high accuracy and easily, and a flat cathode ray tube that does not cause color misalignment, color mixing, etc. can be provided as a display device.

[Brief Description of the Drawings] Fig. 1 is an exploded perspective view showing the main parts of a conventional flat cathode ray tube, Fig. 2 is an exploded perspective view of the main parts of an embodiment of the flat cathode ray tube according to the present invention, and Fig. 3 1 is a perspective view showing an embodiment of a flat cathode ray tube according to the invention; FIG. 1... Back electrode, 2... Linear hot cathode, 3...
... Control electrode, 4... Vertical deflection electrode, 5...
...Control electrode, 6...Acceleration electrode, γ...
Electron beam trajectory, 8...Horizontal deflection electrode, 9...
Accelerating electrode, 10... Transparent substrate, 11... Color fluorescent surface, 12... Electron beam forming section, 13...
...Positioning pin, 14...Positioning electrode, 141...Opening part, 142 91Positioning marker, 15...Transparent substrate, 151...Positioning Pin insertion hole, 16...Pacolor phosphor, 16
1°"°. Positioning marker. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (1) Focusing and deflecting the electron beam from the linear hot cathode. It is equipped with an accelerating electron beam forming section, a face section having a phosphor pattern formed on a transparent substrate, and an alignment electrode fixed at a predetermined position of the electron beam forming section, and the alignment electrode is fixed to a predetermined position of the electron beam forming section. a formed alignment marker;
A flat cathode ray tube, characterized in that the electron beam forming section and the face section are aligned with a positioning marker formed outside the effective screen of the face section.