JPH0330253B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention vertically divides a screen into a plurality of sections, generates an electron beam for each section, and deflects each electron beam vertically for each section. This technology relates to a manufacturing method for a device that displays multiple lines and displays a television image as a whole, and properly irradiates the screen with an electron beam to display a uniform screen without color shift or image breakage. The object of the present invention is to provide a device for manufacturing a device that can perform the following steps.

Conventionally, cathode ray tubes have been mainly used as display elements for displaying color television images, but conventional cathode ray tubes have a very long depth compared to the screen size, making it difficult to create thin television receivers. It was impossible. In addition, EL display elements, plasma display devices, liquid crystal display elements, etc. have recently been developed as flat display elements.
All of them are insufficient in terms of performance such as brightness, contrast, and color display, and have not yet been put into practical use.

Therefore, in order to achieve a flat display device using electron beams, the screen on the screen is vertically divided into multiple sections and an electron beam is generated for each section. A system was devised in which the electron beam was deflected vertically to display multiple lines, thus displaying a television image as a whole.

First, a basic configuration example of an example image display element manufactured according to the present invention will be described with reference to FIG.

This display element is arranged in order from the back to the front.
A back electrode 1, a line cathode 2 as a beam source, vertical focusing electrodes 3, 3', a vertical deflection electrode 4, a beam flow control electrode 5, a horizontal focusing electrode 6, a horizontal deflection electrode 7, a beam accelerating electrode 8 and a screen plate 9. They are housed within the evacuated interior of a flat glass bulb (not shown).

A line cathode 2 serving as a beam source is stretched horizontally so as to generate an electron beam distributed linearly in the horizontal direction, and a plurality of line cathodes 2 (here, 2-2-4
(Only books shown) provided. In this embodiment, it is assumed that 15 pieces are provided. Let's say 2i~2yo. These line cathodes 2 have a diameter of, for example, 10 to 20 μφ.
An oxide cathode material is coated on the surface of a tungsten wire. Then, as will be described later, the electron beams are controlled to be emitted sequentially from the line cathode 2a for a fixed period of time. Back electrode 1
has the effect of suppressing the generation of electron beams from other line cathodes 2 other than the line cathode 2 that is controlled to emit electron beams for a certain period of time, and pushing out the generated electron beams only in the forward direction. do. The back electrode 1 may be formed by a coating of a conductive material applied to the inner surface of the rear wall of the glass bulb.

The vertical focusing electrode 3 is a conductive plate 11 having a horizontally long slit 10 facing each of the line cathodes 2I to 2Y, and extracts the electron beam emitted from the line cathode 2 through the slit 10, and focus in a direction. The slit 10 may be provided with crosspieces at appropriate intervals in the middle, or may be substantially configured as a slit by a row of many through holes arranged horizontally at small intervals (nearly touching intervals). may have been done. The vertical focusing electrode 3' is also similar.

The vertical deflection electrodes 4 are arranged horizontally in the middle of each of the slits 10, one set for each section in the vertical direction, and conductors 13, 13' are provided on the upper and lower surfaces of the insulating substrate 12, respectively. It is made up of the following: A vertical deflection voltage is applied between the opposing conductors 13 and 13' to deflect the electron beam in the vertical direction for each vertical section. In this embodiment, a pair of conductors 13,
13' deflects the electron beam from one line cathode 2 to positions corresponding to 16 lines in the vertical direction. Then, 15 pairs of conductors corresponding to each of the 15 line cathodes 2 are constructed by the 16 vertical deflection electrodes 4, and in the end, the electron beam is emitted so as to draw 240 horizontal lines on the screen 9. Deflect vertically.

Next, the control electrodes 5 are composed of conductive plates 15 each having a vertically long slit 14, and a plurality of control electrodes 15 are arranged in parallel in the horizontal direction at predetermined intervals. In this embodiment, 320 conductive plates 15a to 15m for control electrodes are provided (only 10 are shown in the figure). Each of the control electrodes 5 directs the electron beam horizontally by one pixel (or two pixels).
The amount of passage is controlled in accordance with the video signal for displaying each picture element. Therefore, if 320 control electrodes 5 are provided, 320 picture elements can be displayed per horizontal line. In addition, in order to display images in color, each picture element is displayed with phosphors of three colors R, G, and B, and the conductive plates 15a to 1 of the control electrode 5
5m, R, G, and B video signals are sequentially applied to each picture element. In addition, 320 sets of video signals for one line are simultaneously applied to the 320 control electrodes 5, and the video for one line is displayed at one time.

The horizontal focusing electrode 6 is composed of a conductive plate 17 having a plurality of vertically long slits 16 (320 slits 16) opposite to the slits 14 of the control electrode 5. Each beam is focused horizontally into a narrow electron beam.

The horizontal deflection electrode 7 is composed of a plurality of conductive plates 18 arranged vertically in the middle of each of the slits 16, and a water deflection voltage is applied between each conductive plate 18 to Each electron beam is deflected in the horizontal direction, and the R, G, and B phosphors are sequentially irradiated on the screen 9 to cause them to emit light. In this embodiment, the deflection range is the width of one picture element for each electron beam.

The accelerating electrode 8 is composed of a plurality of conductive plates 19 provided horizontally at the same position as the vertical deflection electrode 4, and accelerates the electron beam so that it collides with the screen 9 with sufficient energy. This accelerating electrode 8 has a similar shape to the horizontal focusing electrode 6,
The slit may have a wider width.

The screen 9 is constructed by coating the back surface of a glass plate 21 with a phosphor 20 that emits light when irradiated with an electron beam, and adding a metal back layer (not shown). The phosphor 20 is arranged for each slit 14 of the control electrode 5, that is, for each horizontally divided electron beam.
A pair of phosphors in each of the three colors R, G, and B are provided, and are applied in stripes in the vertical direction. In FIG. 1, the broken lines drawn on the screen 9 indicate divisions in the vertical direction that are displayed corresponding to each of the plurality of line cathodes 2, and the two-dot chain lines correspond to each of the plurality of control electrodes 5. Indicates the horizontal division displayed. As shown in the enlarged view in Fig. 2, one section partitioned by these two has R, G, and B phosphors 20 for one pixel in the horizontal direction, and 16 lines in the vertical direction. It has a width of
For example, the size of one section is 1 in the horizontal direction.
mm, and the vertical direction is 16 mm.

Note that in FIG. 1, the length in the horizontal direction is greatly enlarged relative to the length in the vertical direction for clarity.

Further, in this embodiment, only one pair of R, G, and B phosphors 20 are provided for one picture element for one control electrode 5, that is, one electron beam, but two
Of course, two or more pairs for more than two picture elements may be provided, and in that case, R, G, and B video signals for two or more picture elements are sequentially applied to the control electrode 5.
Horizontal deflection is performed in synchronization with this.

The present invention relates to an apparatus for manufacturing such an image display device, and in particular, to an apparatus for manufacturing such an image display device, and in particular, the present invention relates to an apparatus for manufacturing such an image display device, and in particular, it controls electron beams emitted from a plurality of linear hot cathodes by using a plurality of electron beam control electrodes that are substantially perpendicular to the linear hot cathodes. The present invention relates to an apparatus for manufacturing a flat image display device that displays an image by controlling, focusing, deflecting, and accelerating the phosphor to collide with the surface of the phosphor.

In the present invention, the electron beam emitted from the plurality of linear hot cathodes is connected to the control electrode, the deflection electrode,
A flat plate that is controlled and deflected and accelerated by accelerating electrodes and is projected correctly onto the predetermined position of the phosphor coated on the display screen, displaying a uniform screen without color shift or image breakage. It is an object of the present invention to provide an apparatus that can manufacture an image display device. Therefore, we devised a device that easily aligns each electrode with a display screen coated with a phosphor with very high precision in order to project an electron beam onto a predetermined position on the phosphor.

An embodiment of the manufacturing apparatus of the present invention will be specifically described below. FIG. 3 is a simple exploded view of the image display device manufactured here. Here, only a part of what is shown in FIG. 1 is shown, including a plurality of linear hot cathodes 2, an electrode 3 for extracting the electron beam, an electron beam control electrode 5, an electron beam deflection electrode 6, an electron beam acceleration Only the electrode 7 and screen 9 are shown. 22 is a metal back layer.

Electrodes 3, 5, 6, 7 each individually processed
In order to obtain a uniform electron beam by combining the electrodes, the grids of each electrode must be combined at predetermined designed positions. For this purpose, holes 23 for positioning are provided in each electrode in advance.
26 is machined, and all alignments are performed using the holes 23 to 26.

First, the alignment of each electrode 3, 5, 6, 7 and the phosphor 20 coated on the display screen 9 will be specifically explained.

4 and 5 are schematic diagrams of the phosphor coating device.
Two positioning points are determined on one side of the glass plate 21 of the screen 9, and one positioning point is determined on the side perpendicular to this side.
28 and 29 for positioning. 30, 31
is a pressing means for pressing the glass plate 21.

Next, the phosphor 2 temporarily applied to the glass plate 21
0 is exposed using an exposure mask 32 and a point light source 33 to form the phosphor 20 in the required shape. If this positioning method is always used, the position and shape of the phosphor formed in this exposure apparatus can be reproducible.

Next, a glass plate 21 coated with a phosphor 20,
A method for aligning the electrodes 3, 5, 6, and 7 will be explained. Glass plate 21 coated with phosphor 20
As shown in FIG. 6, the screen-electrode positioning device 34, which is designed to be positioned at the same position in exactly the same way as the exposure device shown in FIGS. Position. Next, the positioning device main body 37
The positioning pins 38 attached to the 3, 5,
The device body 37 is inserted into the positioning holes 23, 24, 25, and 26 and held, and the position of the device main body 37 is determined by moving the holding means of the device main body 37 so that the electrode portion and the phosphor 20 meet the requirements. A pin 39 and a hole 40 are provided at that position.

Once this positioning is done in this way, the exposure device and screen electrode positioning device described here can be used to expose the phosphor and align the electrodes. A planar imaging device that is easily aligned with very high precision can be obtained.

In the conventional cathode ray tube method, exposure is performed using a shadow mask, and the shadow mask is attached to the cathode ray tube as is, and there is only one electron beam, so that the shift of the electronic pig iron can be covered to some extent by the shadow mask. However, in the above-mentioned flat image display device, there is no shadow mask and there are multiple electron beams, so the phosphor formed by a separate exposure mask and each electrode can be positioned with very high precision. According to the present invention, this alignment can be performed efficiently and with high accuracy, and is very effective.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the basic configuration of an example of an image display device manufactured by the image display device manufacturing apparatus of the present invention, FIG. 2 is an enlarged view of the screen, and FIG.
The figure is an exploded perspective view of the manufacturing process in progress using the manufacturing equipment.
FIG. 4, FIG. 5, and FIG. 6 are a plan view, a side view, and an exploded side view during the manufacturing process according to the manufacturing method. 2... line cathode as an electron beam source, 3,3'
...Vertical focusing electrode, 4... Vertical deflection electrode, 5...
Electron beam flow control electrode, 6...Horizontal focusing electrode, 7
...Horizontal deflection electrode, 8...Electron beam acceleration electrode,
9... Screen, 20... Fluorescent material, 21... Glass plate, 23, 24, 25, 26... Positioning hole, 27, 28, 29... Pin, 32... Exposure mask, 33... ... point light source, 34 ... screen-electrode positioning device, 35 ... pin, 36 ... holding means, 37 ... positioning device body, 38 ... pin.

Claims (1)

[Scope of Claims] 1. A plurality of linear hot cathodes 2, an electrode 3 for extracting an electron beam from the linear hot cathode, and a control electrode comprising a plurality of electrodes and controlling the irradiation amount of the electron beam. 5, a deflection electrode 6 for deflecting the electron beam, an acceleration electrode 7 for accelerating the electron beam, and a display screen 9 coated with a phosphor that emits light when irradiated with the electron beam. A manufacturing apparatus for manufacturing an image display device housed in a glass container, comprising a plurality of fixed positioning pins 35 for fixing the display screen 9 at a predetermined position.
and a screen positioning means having an elastically movable holding means 36; and a plurality of positioning holes 24, 25, 26, 2 formed in the four electrodes 3, 5, 6, 7, respectively.
and a holding means having a positioning pin 38 that is inserted into the screen electrode 7 to hold the four electrodes, and further, the screen electrode positioning means and the holding means are used to align the four electrodes and the display screen. pin 39 and hole 4 for
1. A manufacturing apparatus for an image display device, characterized in that a zero is provided.