JPH0482124A - Assembly of flat image display device - Google Patents

Abstract

PURPOSE:To facilitate position control of each phosphor and of envelop by placing a light transmission type positioning marker and a positioning marker on the side of a screen surface, almost coaxially, so as to electrically detect the quantity of transmitted light, and whereby carrying out positioning. CONSTITUTION:Light is guided to a light detection means 42 such as a photodiode provided correspondingly on four corners of a back surface plate 14, through an open hole part 34 provided on the pattern of a non-light transmission film 32 on the end part of a screen surface 16, an open hole part 40 provided on the end part of an electrode structure 14, and through the back surface plate 12, of which at least a light transmission part is transparent, while the quantity of transmitted light is converted into an electric signal, and is sent to a signal process part 44. In the signal process part 44, a certain signal is obtained either by comparing the level of each signal of quantity of transmitted light, and a certain value read from a memory in the signal process part, with each other through a comparator, or by defining the signal of the quantity of transmitted light in each position, as maximum or minimum, and the signal is output to a driving part 46, and a jig is driven by the driving part 46, so as to move the electrode structure 14, and a relatively optimal position can thus be determined.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in the assembly method of a flat-type image display device for displaying characters and graphics, and in particular to a flat-type image display device that emits light by irradiating cathode rays onto a phosphor. The present invention relates to a method for assembling a flat panel image display device in which the alignment between a color phosphor screen formed by finely painting a plurality of phosphors and an electrode structure in a cathode ray display device can be improved.

(Prior Art) Various flat panel image display devices have recently been proposed. These are basically point-shaped or thin wire-shaped hot cathodes, or substantially planar cathodes made up of a large number of fine cold cathodes, and an electron extraction electrode placed on the screen side of the cathode. Alternatively, an electron beam is extracted by a metal back anode integrated with a phosphor, and the electron beam thus extracted is further focused and deflected, and the amount of the electron beam is controlled or diffused to reach the screen surface. The irradiation is performed to obtain an arbitrary image pattern or a predetermined image pattern.

For example, as shown in FIG. 1, this type of flat panel image display device is equipped with a cathode, which is an electron emitting part, and a large number of electrodes, which are provided for focusing, deflecting, controlling, etc., the electron beam. A plurality of electrodes having through-holes are assembled with precision so that the plurality of four-holes in the poles are approximately coaxial, or are positioned off-axis at predetermined intervals, and each type of electron beam is an electrode structure 14 having a plurality of lead-out terminals 12 to which a voltage for control is applied from the outside;
Consisting of a front plate 18 having a screen surface 16 and a back plate 20, the lead-out terminals 12 of the electrode structure 14 are led out from the sealing surface between the front plate 18 and the back plate 20, and a low plate is attached to this sealing surface. It is constructed by applying melting point solder glass in the form of a paste, drying it, applying an appropriate pressure between the front plate 18 and the rear plate 20, and baking them to integrate them.

Thereafter, in order to remove gas and moisture adhering to the electrodes in the display device assembled in this way and the inner surface of the envelope, the exhaust pipe 22 provided on the front plate or the back plate is heated while baking. The exhaust pipe 22 is heated to shrink, fused and tipped off to complete the assembly of the device.

Next, the configuration of the screen surface 16 of the front plate 18 and the method of positioning the screen surface 16 and the electrode structure 14 will be described. FIG. This front plate 18 is formed in the exact order of No. 51:A. That is, after cleaning the inner surface of the front plate 18, a photosensitive resist is applied, and then exposed and developed. Thereafter, as shown in FIG. 3, a graphite guard hunt film 24 surrounding the phosphor stripe 16a is formed, followed by R(
A slurry of phosphors consisting of phosphors (red), G (green), and B (blue) is applied to a photosensitive resist in the form of a slurry, and exposed and developed to fill in the spaces between the Gartband films 24 to form a fluorescent film. Ru.

Next, this phosphor film is dried, an acrylic resin emulsion is spray-coated on top of this phosphor film, the phosphor screen is flattened by a drying filming process, and then a thin aluminum film is vacuum-deposited on top of this phosphor screen. Then, an anode film is formed by a metal back process, and finally the Filmink film and the phosphor slurry polymer film are heated at high temperature and removed.

An example of a method for positioning the screen surface 16 formed in this way and the electrode structure 14 is shown in FIG. This shows the positioning method used to construct the . Each electrode of the electrode structure 14 may be formed into a flat or striped shape by electrode forming means such as etching or punching a thin metal plate, or these electrodes may be integrally provided outside the effective electrode range and have through holes 12a. The front plate 18 and the back plate 20 are placed on their respective rims 18a and 20a while the frame of the electrode lead-out terminal 12 is stretched horizontally with a constant tension by a stretching means such as a jig having a coil spring (not shown). It is fixed by firing with low melting point solder glass. The screen surface 16 and the electrode assembly 14 are aligned by adjusting the distance between the extension means 26, the envelope, and the end of the electrode terminal, for example, the dimensions d and d2 in FIG. 4, in both the longitudinal direction and the width direction of the electrode. This was done by controlling the position of the envelope in parallel or rotation so that it would reach a predetermined value. In FIGS. 3 and 4, reference numeral 28 indicates an internal conductive film connected to the anode of the screen surface 16, and reference numeral 30 indicates an internal conductive film connected to this internal conductor @2B and led out through the rim 18a of the front plate 18. It is an anode terminal.

(Problem to be solved by the invention) In this type of flat cathode ray display device, the dimensional tolerance of the envelope is about 0.3 mm, and in the case of a normal color phosphor screen, there are three colors of red, green, and blue. One pixel consists of a phosphor and a guard hunt formed to surround each phosphor strip or dot, and each pixel has a width of 0.3 to 0.5 mm.
Therefore, in order to use the positioning method of the prior art for a color screen, the dimensional accuracy of the envelope must be increased to at least 0.05 mm, which is extremely expensive, and It has been extremely difficult to control the position between each phosphor formed in a stripe or dot shape and the envelope.

It is an object of the present invention to easily position the screen surface and the electrode structure even if the dimensional accuracy of the envelope is not high, and to control the position of each phosphor of a color screen and the envelope. An object of the present invention is to provide a method for assembling a flat panel image display device, which allows easy assembly of a flat panel image display device.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention has provided an electrode structure in which a phosphor screen is attached to an electrode structure in an envelope formed by joining a front plate and a back plate having a phosphor screen surface. In a method for assembling a flat panel image display device, which is housed in a predetermined position R1y with respect to a screen surface, an aperture formed in a light-opaque film integrally provided with a phosphor coating pattern on a phosphor screen surface. A light-transmissive positioning marker is formed in the electrode structure or its support substrate, and a positioning marker is formed in the electrode structure or its supporting substrate as an aperture substantially coaxial with the positioning marker on the phosphor screen surface side. The amount of transmitted light passing through the positioning marker is electrically detected, and this detection signal is processed to displace the electrode assembly or envelope until it is in the proper position with respect to the electrode assembly or its supporting substrate or the phosphor screen surface. The present invention provides a method for assembling a flat panel image display device, which is characterized by positioning.

(Function) In this way, a light-transparent positioning marker consisting of an opening provided in a light-impermeable film provided integrally with the phosphor coating pattern on the screen surface, and an electrode structure or its supporting substrate. The amount of transmitted light that passes through the positioning marker on the screen surface side and the positioning marker consisting of an opening provided almost coaxially is detected electrically, and from this detection signal, it is determined whether the electrode assembly or its supporting substrate or the phosphor screen surface is Since positioning is performed by displacing the electrode assembly or envelope after determining the appropriate position, the positioning of both can be performed with high precision.In particular, the positioning marker on the screen surface side has a substantially rotating pattern with the phosphor pattern. Because it is formed, there is no increase in process steps, and the device is simple and can be assembled economically.

(Embodiment) An embodiment of the present invention will be described in detail with reference to FIG. 6 and subsequent figures. FIG. The front plate 18 includes a light-opaque film 32 such as graphite coated between the vertical broken line and the left and right rims 18a, a phosphor screen 17A having an area surrounded by the broken line, and the entire surface of the phosphor screen 17A. and a metal back surface 17B that covers most of the light-opaque film leaving the corners of the rectangular panel.

The flat image display device plate 18 of the present invention is provided with a positioning means 36 consisting of a circular hole 34 cut in the light-opaque film 32 at a part of the corner, and the circular pattern of the hole 34 and the electrode structure 14 or Opening portion 40 provided in the electrode structure support substrate 38 that supports the electrode structure
The front plate 18 and the electrode assembly 14 are positioned relative to each other by aligning them as shown in FIG.

The electrode assembly 14 is fixed to a jig that can be translated and rotated by having an electrode extension means (not shown), and this jig is mounted on a sealing jig (not shown) with an error of about 0.1 to 0.2 mm. placed and maintained. Visible light such as red light oriented parallel to the top of the front plate 18 is incident from a direction substantially perpendicular to the screen surface 16 of the front plate 18, and the screen surface 1
6, through the openings 34 provided in the pattern of the light-opaque film 32 at the ends of the electrode structure 14, through the openings 40 provided at the ends of the electrode assembly 14, and through the back plate 14, which is transparent at least through the light-transmitting portions. The light is guided to light detection means 42 such as photodiodes provided corresponding to the four corners of the face plate 14, and the amount of transmitted light is converted into an electrical signal and sent to the signal processing section 44.

The signal processing section 44 compares the level of each transmitted light amount signal with a predetermined value read out from the memory in the signal processing section 44 using a comparator, or sets a predetermined value so that the transmitted light amount signal at each position becomes maximum or minimum. A signal is obtained and outputted to the drive unit 46, and the drive unit 46 drives the jig to move the electrode structure 14 and determine the relative optimum position.

After positioning the electrode assembly 14 in this manner, the jig is temporarily fixed at this position, and in this state, the electrode assembly 14 and the back plate 20 are sealed and integrated.

At this time, the markers used to monitor the amount of transmitted light are, for example, as shown in FIG. In this case, if accurate positioning is performed, both apertures 34 and 40 will overlap to maximize the amount of light.

Further, as shown in FIG. 1O(B), the marker has a donut-shaped opening 34 provided in the screen surface 16 and a circular opening 40 provided in the electrode structure 14 with approximately the same diameter. In this case, accurate positioning is performed so that the amount of transmitted light is minimized. Furthermore, the light detection means 4
If it consists of two or more detectors, then Figure 1O (
As shown in C), the aperture 34 is cross-shaped, so accurate positioning can be achieved by separately detecting and comparing the amounts of transmitted light at the top, bottom, left and right of the aperture 34. Note that these openings may be shaped other than circular, donut, or cross.

Next, another embodiment of the present invention will be described with reference to FIG. 8. In this embodiment, the electrode assembly 14 is provided inside the envelope at the sealed portion between the front plate 18 and the back plate 20. It is connected to the lead-out terminal 12 by a flexible connecting means 48 .

As shown in FIG. 8, a flange 50 provided with a positioning hole 40 is integrally provided at the end of the electrode assembly 14 with a magnetic positioning means 52 consisting of an iron core, an electromagnet, etc. 14 is semi-fixed to the front plate 18.

Further, external positioning means 54 made of an electromagnet or the like is provided outside the envelope in correspondence with each magnetic positioning means 52.

In this embodiment, as in the previous embodiment, parallel light is emitted from the top of the front plate 18 to the screen surface 1 provided on the front plate 18.
6, and these parallel lights are transmitted through the apertures 34 provided in the light-opaque film pattern 32 at the end of the screen surface 16 and the apertures provided in the 7 langes 50 of the electrode assembly 14. 40, and a back plate 20 whose light transmitting portion is transparent at least.
The light enters through the light detection means similar to that shown in FIG. 7, which is arranged below the back plate 20.

Thereafter, the transmitted light amount signal is sent to the signal processing section 44 in the same way as the path shown in FIG.

This drive unit 46, for example, energizes the coil of an electromagnet that is the external positioning means 54 to move the electrode assembly 14 to determine a relative optimum position, and at this position, the laser beam is emitted from the back plate 20 to the front plate 20 and the electrodes. The position is determined by fixing movable fixing means (not shown) provided on the structure 14.

In this embodiment of Section 8, the positioning markers provided on the screen surface 16 and the electrode assembly 14 are similar to those in the previous embodiment. What is different?

9(A) to 9(C) show one example of a method for forming positioning markers on the screen surface 16. FIG.

After cleaning the inner surface of the front plate 18, as shown in FIG. 9(A), a photosensitive resist is applied to the entire inner surface of the front plate 18, and a photoresist is applied to the phosphor stripes or dots and the positioning marker openings. Exposure and development are performed using an exposure mask 56 so that the corresponding portion remains after development. still,
In FIG. 9(A), reference numeral 58 indicates an opening in the phosphor dot portion.

Thereafter, graphite corresponding to the light-opaque film 32 containing water glass is applied onto the resist pattern, and lift-off is performed using hydrogen peroxide water to remove the resist and the taraphite applied thereon. form.

A slurry in which R, G, and B phosphors are suspended is further formed on the Gart Hunt 24 thus formed by a known method. At this time, as with a normal color phosphor screen, if the edge of the screen surface is not irradiated with light, no phosphor will remain in the apertures 34, which are the positioning markers provided earlier (see Figure 9 (B)). ).

Next, the film of the phosphor 16a is dried by a normal method,
After spraying Filmink solution on top of it while rotating the envelope, drying and flattening the phosphor film,
Forming a metal back film (anode) 60 (FIG. 9(C))
reference).

At this time, apply a suitable metal mask 6 only to the corners of the screen surface.
2, the metal film as a metal back film does not adhere to the corners, and the screen surface 16 shown in FIG.
or is formed.

In the above description, visible light, infrared light, ultraviolet light, or laser light may be used as the transmitted light. In particular, when working indoors, it is better to use infrared or ultraviolet light to avoid the effects of stray light.

Further, if the apertures 34 of the light-opaque film 32 are positioned with high accuracy with the phosphor screen guard band, this may be exposed and developed as a separate process, and the light-opaque film 32 is used for positioning. Graphite may not be used as long as it is opaque to light, and an aluminum metal back may be directly deposited using an appropriate mask to improve adhesion to the panel.

Further, if the opening 40 provided in the electrode structure 14 or the support substrate integrated with the electrode structure is provided substantially coaxially with the positioning marker on the screen surface side, the electrode structure can be extended or temporarily fixed. It may also be used as an opening used for such purposes.

(Effects of the Invention) According to the present invention, as described above, the amount of transmitted light passing through the light-transparent positioning marker on the screen surface side and the light-transparent positioning marker on the electrode structure side is electrically detected, From this detection signal, the proper position of the electrode structure, its supporting substrate, or the phosphor screen surface is determined, and the electrode structure is positioned by displacing it relative to the envelope.
In particular, the positioning markers on the screen side are formed with substantially the same pattern as the phosphor pattern, so there is no increase in the number of steps, and the equipment is simple and assembly is economical. There are practical benefits that can be done.

[Brief explanation of drawings]

Figure 1 is an exploded perspective view of an example of a flat panel image display device;
Figures (A) and (B) are respectively an inner plan view and a sectional view of the front plate used when assembling the device shown in Figure 1, Figure 3 is a plan view of the phosphor film, and Figure 4 is the assembled state of the conventional technology. FIG. 5 is a process diagram showing the process of forming the screen surface of FIGS. 2(A) and 2(B), FIG. 6 is an inner plan view of the front plate used to assemble the device by the method of the present invention, and FIG.
The figure is a schematic system diagram showing the assembly method of the present invention, FIG. 8 is a sectional view showing an assembled state according to another embodiment of the present invention, and FIG. 9 (
1A to 1C are cross-sectional views sequentially showing the process of forming a fluorescent screen surface, and FIG. 1O is a plan view showing different states in which the electrode structure is aligned with the screen surface by the method of the present invention. 12------4 output terminals, 14----one electrode structure, 1
6----- Screen surface, 18- One front plate, 20-
---One back plate, 32-111 light-opaque film, 34---
--Open hole.

Claims (3)

[Claims] (1) A flat plate image display in which an electrode assembly is housed in a predetermined position relative to the phosphor screen surface in an envelope formed by joining a front plate and a back plate having a phosphor screen. In the method for assembling the device, a light-transmissive positioning marker is formed by an aperture provided in a light-opaque film provided integrally with the phosphor coating pattern of the phosphor screen, and the electrode structure or A positioning marker consisting of an opening provided substantially coaxially with the positioning marker on the phosphor screen side is formed on the support substrate, and the amount of transmitted light passing through both the positioning markers is electrically detected, and the detection signal is assembly of a flat panel image display device, characterized in that positioning is performed by displacing and positioning the electrode assembly or its envelope until the electrode assembly or its supporting substrate is at a proper position with respect to the phosphor screen. Method. (2) The method for assembling a flat panel image display device according to claim 1, wherein the light-opaque film is made of graphite. (3) The method for assembling a flat panel image display device according to claim 1, characterized in that the positioning is performed so that the amount of transmitted light is a maximum value or a minimum value.