JPS6348725A - Manufacture of screen - Google Patents

Abstract

PURPOSE:To manufacture a screen in a simple method generating no environmental pollution by depositing various fine particles on a resin film formed on a glass surface using a highly accurate heat source such as a laser beam. CONSTITUTION: A resin film 32 is formed on the surface of a glass plate 31. Carbon black powder 35 is scattered on this surface, a laser beam 46 is moved while being radiated to the necessary portion in a fixed width, thereby the powder 35 is fixed to the resin portion 32 melted by heat to form a black stripe 35a. The excess powder 35 not melted is removed. A red phosphor 43 or the like is formed by depositing various-color phosphor powder in the similar process. This method is simple and requires no washing and developing processes and generates no environmental pollution.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention generates an electron beam for each division when a screen on a screen is vertically divided into a plurality of divisions, and generates an electron beam for each division. The present invention relates to a method of manufacturing a screen that displays a plurality of lines by deflecting a beam in the vertical direction and is used in a device that displays a television image as a whole.

Conventional technology Traditionally, 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 use in thin television receivers. It was impossible to create. In addition, although 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 been put into practical use. It has not yet been reached.

Therefore, in order to achieve a flat display device using electron beams, Honda 2 applicants filed Japanese Patent Application No. 56-20618 (
A new display device was proposed in Japanese Patent Application Laid-Open No. 57-136590.

This method generates an electron beam for each section when the screen is divided vertically into multiple sections, and deflects each electron beam vertically for each section to create multiple lines. The TV screen image is displayed as a whole.

First, a basic configuration of the image display element used here will be explained with reference to FIG. 2. This display element includes, in order from the rear toward the front trap, a back electrode 1, a line cathode 2 as a beam source, vertical focusing electrodes 3, 3', a vertical deflection electrode 4, a beam current control electrode 6, a horizontal focusing electrode 6, a horizontal A deflection electrophoresis device 7, a beam accelerating electrode 8, and a screen 9 are arranged, and these are housed inside a flat glass pulp (not shown) which is made into a vacuum. A line cathode 2 serving as a beam source is stretched horizontally so as to generate an electron beam distributed horizontally in the form of powder. 2a~
2d only four are shown). In this example, it is assumed that 15 are provided. 2a~2 them
o. These line cathodes 2 have a diameter of, for example, 10 to 20μφ.
The surface of the tungsten wire is coated with an aggressive oxide material for thermionic emission. These line cathodes 2a to 2o are heated so as to generate a thermionic beam when a current is passed through them, and as will be described later,
The electron beams are controlled to be emitted sequentially from the line cathode 2a at fixed time intervals.

The back electrode 1 suppresses the generation of electron beams from other line cathodes other than the line cathode that is controlled to emit the electron beam for a certain period of time, and directs the generated electron beams only in the forward direction. It has the effect of pushing out.

This back electrode 1:d may be formed by a coating film of a conductive material attached to the inner surface of the back wall of the glass pulp. Further, instead of the back electrode 1 and the linear cathode 2, a planar electron beam emitting cathode may be used.

The vertical focusing electrode 3 is a conductive plate 11 having a horizontally long slit 10 facing each of the line cathodes 2a to 2o, and extracts the electron beam emitted from the line cathode 2 through its slit 10, and directs the electron beam in the vertical direction. Concentrate on.

Electron beams for one horizontal line (360 pixels) are taken out at the same time.

In the figure, only one section in the horizontal direction is shown. The slit 1o may be provided with crosspieces at appropriate intervals in the middle, or it may be a row of through holes arranged horizontally at small intervals (nearly touching each other). It may also be configured as a slit.

The vertical focusing electrode 3' is also similar.

A plurality of vertical deflection electrodes 4 are arranged horizontally at intermediate positions of the slits 10, and conductors 13, 13' are arranged on the upper and lower surfaces of the insulating substrate 12, respectively.
It consists of a set of Then, a vertical deflection voltage is applied between the opposing conductors 13 and 13' to deflect the electron beam in the vertical direction. In this embodiment, one wire cathode 2 is formed by a pair of conductors 13 and 13'.
The electron beam is deflected vertically to a position corresponding to 16 lines.

The 16 vertical deflection electrodes 4 constitute 15 pairs of conductors corresponding to each of the 16 line cathodes 2.
In the end, the electron beam is deflected so as to draw 240 horizontal lines on the screen e.

Next, the control electrodes 6 are composed of conductive plates 15 each having a vertically long slit 14, and a plurality of control electrodes 6 are arranged in parallel in the horizontal direction at predetermined intervals. In this example 1
Eighty control electrode conductive plates 15-1 to 16-n are provided. (Only 9 lines are shown in the figure). Each of the control electrodes 6 extracts the electron beam horizontally by dividing it into two picture elements each, and controls the amount of electron beam passing therethrough in accordance with a video signal for displaying each picture element. Therefore,
If 18,080 conductive plates 15-1 to 15-n for control electrodes 5 are provided, 360 pixels 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 H, and each control voltage %rs! , ζ are sequentially added R, G, and B video signals for two picture elements.

In addition, 180 control electrodes 5 4 electric plates 15-1 to 15-
Each nO has 180 pairs for one line (2 pairs per pair).
The video signals of the pixels (picture elements) are applied simultaneously, and one line of video is displayed at one time.

The horizontal focusing electrode 6 is composed of a conductive plate 17 having a plurality of 180 long slits 16 in the vertical direction facing the control electrode 50 and the slit 14. Each is focused horizontally into a narrow beam of electrons.

A plurality of horizontal focusing electrodes 7 are electrically conductive plates 18 arranged vertically on both sides of the slit 16,
18', each electrode 18, 18
A six-step horizontal deflection voltage is applied to the screen 9 to deflect the electron beam for each picture in the horizontal direction.
At the top, irradiate each of the 2 strings OR, G, and B phosphors in sequence to get used to emitting light.

In this embodiment, the deflection range is two picture elements wide for each electron beam.

Calorie speed electrode 8: Consists of a plurality of conductive plates 19 installed horizontally at the same position as the vertical deflection electrode 4, and is arranged in a Z direction so that the electron beam collides with the screen 9 with sufficient energy. talk.

The screen 9 is constructed by coating the back surface of a flat glass plate 21 with a phosphor 2o emitted by electron beam irradiation, and adding a metal bank layer (not shown). The phosphor 20 has two phosphors of three colors R, G, and H for one slit 14 of the control electrode 6, that is, for each one electron beam divided in the horizontal direction.
They are provided in pairs and are applied in vertical stripes. In FIG. 2, 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 6. Indicates the horizontal division displayed. In the box with n divisions between these two, it is enlarged and shown in Fig.
, BD phosphor 20, and has 16 lines worth of light in the vertical direction. The size of one section is, for example, 15 ttrs in the horizontal direction and 9 aN in the vertical direction.

Note that in FIG. 2, the length in the horizontal direction is greatly expanded relative to the length in the vertical direction for clarity.

Further, in this example, one control electrode 5, that is, one '1
For the E-beam, only one pair of R, G, and B phosphors 2° is provided for two elements, but of course, one or three or more picture elements may be provided. In that case, the control electrode 5 has only one pixel: R for three or more pixels;
G and B video signals are sequentially separated and horizontally deflected in synchronization with them.

Conventionally, in such an image display element, the screen 9 has been manufactured by the following process. - First, clean the transparent glass plate using a neutral detergent.

Thereafter, the surface to which the phosphor is applied is cleaned with hydrofluoric acid to roughen the surface. Then, after washing with pure water, as shown in FIG.
form 2. PVA (polyvinyl alcohol) can be used as this resin.

Next, as shown in FIG. B, a resin film 33 containing a photosensitizer for forming stripes is formed on this resin film 32 by a slurry method. This resin contains PVA, potassium dichromate, etc. Then, exposure is performed using a mask, and the resin film 33 other than the exposed portions is washed off. Then,
After that, a translucent stripe 34 is shown in FIG.
are formed at regular intervals.

Next, carbon 35 is applied to the entire surface by a slurry method and dried. This state is shown at F'121D.

Then, etching is performed using hydrogen peroxide or the like to remove the carbon 3 coated on the translucent stripe 34.
Peel off 5. Next, development is performed, and the carbon 35+
f- makes the black stripe fBA clear. The glass plate 31 is dried in this state.

This state is shown in Figure E.

Then red, green, and blue phosphors are applied sequentially. First, as shown in FIG. F, the entire surface except for the red phosphor 36 and the black stripe is coated by a slurry method and dried.

Next, the area where the red phosphor 36 is originally applied (see FIG. 3) is exposed. Then, by developing with a hot water shower, the red phosphor in the pool area is washed away except for the area where the red phosphor 36 is originally applied. Thereafter, it is dried to complete the formation of the red phosphor 36.

Next, a green phosphor 37 is formed through the same process as that for forming the red phosphor 36. Finally, as expected, red phosphor 3
A blue phosphor 38 is formed by a process similar to step 6. The respective states are shown in Figures G and H, respectively.

Then, in the subsequent process, a water-retaining treatment is performed to prevent the lacquer and aluminum from entering the phosphor 36, 37, 38, and the lacquer 39 is applied (I) and dried, and then aluminum 40 is vacuum-evaporated. (same figure ■)
. With this, the formation of the screen 9 is completed.

The problem that the invention aims to solve However, traditional manufacturing methods like the one above produce red.

The coating work for each of the green and blue phosphors involves similar steps such as coating, drying, exposure, development, and drying, resulting in poor productivity and a large amount of moisture during development. However, when disposing of the sweet phosphor, it is necessary to carry out a treatment that does not cause pollution, which further deteriorates productivity and is disadvantageous in terms of cost.

In view of the above problems, the present invention streamlines the manufacturing process.

An object of the present invention is to provide a method for manufacturing a screen that can reduce costs.

Means for Solving the Problems In order to achieve the above object, the screen manufacturing method of the present invention includes a first step of roughening one surface of the glass plate;
Roughened surface of glass plate: ・Second step of forming a thermofusible resin film, attaching carbon black powder to the entire surface of this resin film, and applying laser light etc. to the desired diameter. The third step is to form black stripes by squeezing the resin film and moving it in stripes, melting the resin film with a laser, fixing the carbon on the resin film, and removing unnecessary carbon black, and the surface on which the black stripes are formed. A fourth step of attaching phosphor powder to the glass plate and fixing the phosphor powder to the glass plate using the beam light or the like to form phosphor stripes.

According to the manufacturing method of the present invention, after forming a resin film, the formation of black stripes, red, green, and blue phosphors is performed by attaching carbon black powder and phosphor powder onto the resin film. let me,
It is only necessary to apply a heat source such as a laser beam, and the exposure and development required when forming the conventional black stripe and each phosphor stripe are no longer necessary, making it possible to greatly streamline the process.

Further, a large amount of water is not required, and waste liquid treatment is also not required, which is extremely advantageous in terms of total cost.

The above-mentioned stripes may be formed one by one, or a black stripe or a plurality of phosphors of the same color may be formed.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. First, the transparent glass plate 31 is washed, then one side of the glass plate 31 is roughened, and after the glass plate is washed with water, carbon black powder or , Coating and drying a thin resin film 32 such as PVA to facilitate adhesion of the phosphor powder is the same as in the conventional method.

In this manufacturing method, stripe formation is then performed. 1st
Figure A shows a state in which a thin PVA resin film 32 is formed. Here, 31 is a glass plate, 31a is a roughened portion of one surface of the glass plate 31, and 32 is a resin film.

Next, as shown in B, carbon black is sprinkled on one surface of the resin film 32 and attached thereto. 35 is carbon blank powder.

Subsequently, as shown in C, the laser beam 46 is focused on the required part of the black stripe so that the beam spot has a certain size, and is moved while irradiating it. Carbon powder 36 adheres to the resin portion 32a heated and melted by the beam. Thereafter, the carbon blanks other than those forming the black stripe 36a are removed to complete the black stripe 35a as shown in D.

Next, as shown in FIG.
The resin film 32 is heated and melted from above with a laser beam 46,
Weld and assimilate the red-banded photon. Unnecessary phosphors in the pond are then removed by blowing air or the like to form phosphor stripes red 43 as shown in FIG. The edge band phosphor 44 and then the blue phosphor 45 are then striped in the same manner as the red band phosphor 43.

According to this method, the exposure and development steps that were conventionally required are no longer necessary, allowing for extensive rationalization.

In addition, the conventional treatment for making the water used to wash off the stripes, phosphors, and black stripes pollution-free is not necessary, and further rationalization and cost reduction are possible.

In addition, when forming each stripe with whole blood, one strip may be formed for each stripe, or a plurality of stripes may be formed for each stripe. Further, the steps of water absorption, lacquer application, and metal vapor deposition after coating the phosphor are the same as conventional ones.

Effects of the Invention As described above, according to the present invention, each stripe of the screen is formed by melting the resin film and fixing various powders using a highly accurate heat source such as a laser beam. Extensive rationalization and cost reductions are possible, and the actual value is enormous.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the steps of a method for manufacturing a screen according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing the groove structure of an image display element in which the screen is used, and FIG. 3 is an exploded perspective view of the screen. Front view x, Figure 4 shows the conventional screen 6
FIG. 3 is a cross-sectional view showing steps of a manufacturing method. 31...Glass plate, 32...Resin film, SS
a... Plaque stripe, 43... Red band luminous body,
44... Edge band photon, 46... Blue phosphor, 46
···Laser beam. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure F) 1' ward of η in Bunpei Tsute, Uhiki Haku co 0OLIJ
IJ-(!7 Figure 4 ■) (δ) 3233, . 12 (…)35 Figure 4

Claims (1)

[Claims] The first step is to roughen one side of the glass plate, the second step is to form a resin film with a certain thickness on the surface of the roughened glass plate, and the second step is to form a resin film with a certain thickness on the surface of the resin film. The third step is to attach the body and apply a heat source such as a laser beam to the necessary parts to melt the underlying resin film and fix the carbon powder to the glass plate to form a black stripe, and the above-mentioned black stripe is formed. A phosphor of a predetermined color is attached to the entire surface of the glass plate, and a heat source such as a laser beam is applied to the necessary areas between the black stripes to melt the underlying resin film and fix the phosphor to the glass plate. a fourth step of forming phosphor stripes of a constant width and length.