JPH0413383A - Manufacture of large sized screen display device employing cathode ray tube and its component - Google Patents

Abstract

PURPOSE:To eliminate a black frame caused at a joint with an adjacent cathode ray tube by providing sets of transparent rods densely onto a image receiving face, forming a front glass of the cathode ray tube swollen forward and selecting the length of the transparent rods getting longer from the center of the glass toward the circumference. CONSTITUTION:A light from a picture element lighted on a picture receiving face 2 of a cathode ray tube 1 passes through sets 3 of transparent rods and radiates from the top 4 of them. The ray radiates from the top of each transparent rod in a way of dots along with the pattern of the image receiving face 2. The sets 3 of the transparent rods are arranged in a direction to compensate the discontinuity of a frame 7 thereby obtaining continuous radiating pattern without a black frame. For example, a front glass 50 is formed excessively swollen forward and the swollen part is designed to be, e.g. three times in comparison with a conventional tube. Then the length of the transparent rods 30 is selected so that it is shortest in the middle of the glass 5, gets longer toward the circumference and it is largest at the circumferential ridge 4. As a result, a radiation face X-X is almost made flat or a curved face with a large radius of curvature.

Description

[Detailed description of the invention] [Industrial application field]

A method and means for erasing a black frame that occurs at the joint between adjacent cathode ray tubes when a large number of cathode ray tubes are arranged in parallel to form one color display.

2. Description of the Related Art A black joint between a cathode ray tube and an adjacent cathode ray tube is unsightly.

[Issue to be solved]

By eliminating the seams (black and dark), it became possible to create a large color display by arranging many cathode ray tubes in parallel.

[Means to solve]

A0 Invention 1 Invention 1 is configured as follows, as shown in FIG. 1, for example. In a screen display means in which a large number of color television picture tube-shaped cathode ray tubes 1 are arranged in parallel to form one large screen, a group 3 of transparent rods 30 are provided in front of each image receiving surface 2 in a dense manner on the image receiving surface 2, and so on. The leading edge 4 of the transparent rod 30 is arranged in a direction in which it almost touches the leading edge 40 of the transparent rod of the other image receiving surface 20 at the boundary where it contacts the image receiving surface 20 of the cathode ray tube, and the glass 5 on the front surface of the cathode ray tube is positioned extra forward. The transparent rod 30 is made of thin glass that bulges out, and the length of the transparent rod 30 is short at the center of the glass and gradually increases toward the periphery. B9 Invention 2 The present invention 2, as shown in FIG. 2, is characterized by the following configuration. In a screen display means in which a large number of color television picture tube-shaped cathode ray tubes 1 are arranged in parallel to form one large screen, a group 3 of transparent rods 30 are provided in front of each image receiving surface 2 in a dense manner on the image receiving surface 2, and so on. The leading edge 4 of the transparent bar 30 is arranged in a direction in which the leading edge 4 of the transparent bar 30 is substantially in contact with the leading edge 40 of the transparent bar of the other image receiving surface 20 at the boundary where the transparent bar 30 contacts the image receiving surface 20 of the image receiving surface 20 . A cathode ray tube is smaller than the above-mentioned large screen, and its size is such that it is composed of a front glass whose thickness T is approximately no larger than the scanning line width W, and whose length is the length of the transparent rod 30. The length is short in the center of the glass and gradually becomes longer towards the periphery. C0 Invention 3 Invention 3 is characterized in that it is configured as follows in Invention 1 or Invention 2. The transparent rod 30 is made of thermo-softening synthetic resin, and the transparent rod group 3 is composed of a large number of small bundles B of transparent rods, and the bundle B is compressed until the air content on the entrance surface 200 becomes close to zero. It has a quadrilateral cross section, is bound by a band 8, and is formed to gradually widen toward the exit side. D1 Invention 4 The present invention 4 is characterized in that the above invention 3 is configured as follows. In the above manufacturing method of bundle B, a temporary frame F made of synthetic resin in the shape of a rectangular cylinder is provided to house small groups of transparent rods, the small groups of transparent rods are densely stored, and the four pieces surrounding the temporary frame F are pressed. The material 50 is heated while applying more pressure on the entrance side and less pressure on the exit side, and is compressed and deformed until the air on the entrance surface 200 is expelled.Then, the temperature is lowered and the temporary frame F is removed. The above-described bundle of small transparent rod groups is manufactured by gripping the small group of transparent rods in a manner that spreads out by means of a quadrilateral cylindrical band 8 formed as shown in FIG. 18).

[Effect]

A0 Invention In FIG. 1, the pixels shining on the image receiving surface 2 of the cathode ray tube 1 pass through a group of transparent rods 3 and are emitted from the leading edge 4. Light rays are emitted from the leading edge of each transparent rod in a dot shape according to the screen of the image receiving surface 2. The group 3 of transparent bars is oriented in a direction to cover the frame 7, so that a continuous exit screen without a black frame is obtained. However, the front surface of the cathode ray tube is covered with a thick glass 5 as shown in FIG. 11, and the tip 31 of the transparent rod cannot approach the pixels 6, so there is an extra pixel 6a. 61) also enters the transparent rod tip 31, so accurate resolution cannot be obtained. Therefore, as shown in FIG.
It is desirable to provide a small value. However, recently, as shown in FIG. 19, cathode ray tubes for color TVs are designed with a thick front glass 5o, as is well known, and efforts are made to make the surface shape as flat as possible, approaching the shape of a flat plate. Contrary to the improvement in the technical level of color TV cathode ray tubes, the present invention ignores the odd shape and bulges the front glass. The inventors focused on the fact that even thin glass, such as that found in thermos flasks and fluorescent lamps, can withstand atmospheric pressure. It is applied to cathode ray tubes. FIG. 1 shows an example of this, and it is designed to bulge out more forward than the general product shown in FIG. 19, so that the bulge is, for example, three times that of the general product. As a result, the image in front of the glass is curved, resulting in an image that is extremely strange compared to current common sense. However, in the present invention, since it is shown to the audience through the transparent rod group 3, the length of the transparent rod 30 is adjusted so that it is short at the center of the glass 5 and gradually lengthens toward the periphery along the curved surface of the glass. Lengthen. As a result, the exit surfaces X...X can be made substantially flat or gently curved. However, even if the above-mentioned means are executed, a clear image cannot be obtained. The means for obtaining a clear image will be described in detail in Example 1 below. B0 Invention 2 In Invention 1, the front glass of the cathode ray tube is significantly bulged as a means of thinning the glass to make it easier to withstand atmospheric pressure, but in place of this means, Invention 2 uses a means of thinning the glass. A glass member of the same type as a common color TV cathode ray tube is used. As the overall dimensions of the cathode ray tube are gradually reduced, the glass becomes thinner, and as shown in Figure 4, the thickness T of the front glass is almost equal to the width of the scan! ! It becomes the same as It@W. Although not shown, it is more preferable that T<W. Cathode ray tubes of such dimensions are stacked in multiple stages. (Figure 2) As a result, a single cathode ray tube receiver has fewer scanning lines. In this case, a conventional shadow mask or the like may be used, a roughened shadow mask may be provided, or the shadow mask may be omitted. The same symbols as in Example 1 2.20.3.30.4.40.
5 is the same as in Example 1, and its explanation will be omitted. C0 Invention 3 The transparent rod group 3 described in Invention 1 is a group of transparent rods 30, and each transparent rod is required to be optically separate. Therefore, the respective transparent rods cannot be melted or bonded with adhesive. Therefore, it is necessary to bind the separate transparent rods into a bundle, even if it is troublesome. However, the entrance surface has a large concave surface and is unstable and easily collapses when combined into a single bundle. Invention 3 solves the problem by stacking bundles of small groups of transparent rods. The transparent bar population is B a , B b , B c , B
The transparent rods are divided into small groups as shown in FIG. This bundle B is stacked in multiple stages to form an injection surface X-----X as shown in Figure 1.
to form. The stacking means will be described in Example 3. D0 Invention 4 Invention 4 is a method for manufacturing bundle B, and will be explained in detail in Example 4.

[Embodiment 1] Invention 1 Refer to Figs. 1 and 3 to 11 In Fig. 1, a group 3 of transparent rods 30 is densely provided close to the curved surface of the front glass 5 of the cathode ray tube, and adjacent The ends 4.40 of the transparent rods of the cathode ray tube are oriented toward each other. Contrary to current common sense, the front glass 5 of the cathode ray tube, which has bulged significantly, is formed to be thin, and the transparent rod 30 is formed on the front glass 5.
Shorter in the center and longer at the periphery. The exit surface X...X is a curved surface close to a flat surface. An example of the thickness of glass is if. If the thickness of the glass is 310mm, the apparent thickness (light rays passing through the glass are refracted in a direction approaching a line perpendicular to the glass surface, making it appear thinner than it actually is) depends on the viewing angle, for example. 1.5 mm, which brings the resolving power close to the practical range when used with a scanning line width of about 3 mm. Figure 4 shows an example of this, assuming that the glass thickness is 4 mm, the apparent thickness of the upper glass is 2 mm, and the width W of the scanning line is 4 mm.
ffiIl, using 100 scanning lines (40cm high) and 5 cathode ray tubes (top and bottom), it is possible to form a large screen approximately 2.2m high. In this case, the diameter d of the transparent bar 30 is the width W of the scanning line.
It is thinner, and in the figure it is made one-fourth as thin. Making the transparent rod thinner does not involve any technical burden and has some effect on improving resolution. If technology permits, if it is possible to design a glass with thinner glass, or if the glass can be expanded to a larger extent to make it thinner, the resolution can be improved accordingly. In that case, the number of cathode ray tubes may be decreased by increasing the number of scanning lines of the cathode ray tubes by -. Compared to the case of optical fiber communication, the distance of the present invention is very close, and the material of the transparent rod may be flexible in terms of transparency, and synthetic resin is sufficient. Examples of such close-range light transmission include five applications (including Utility Application No. 63-113925 filed earlier by the applicant of the present invention).
(hereinafter referred to as the prior application), we created a number of prototypes and confirmed their effectiveness. Although both prototypes are made of synthetic resin,
Fortunately, we were able to obtain a clear transmission beam due to the close distance. However, in the present invention, a prototype was produced according to the above-mentioned FIG. 1, but unfortunately, the image was blurred like a halation, lacked contrast, and became a dull black image. So, we conducted another experiment with the aforementioned prototype, and as expected, we were able to achieve clear light transmission. The inventors researched why the prototype model based on Figure 1 causes halation-like blur, thinking that if they could find out the cause, they would be able to obtain the same sharpness as the previous application. The resulting theory is described next. In FIG. 5, the transparent rod group 3 is a collection of individual transparent rods 30, and air E is filled between each transparent rod. If this state is considered as a side view, it will be as shown in FIG. Oblique light incident from the cut surface 31! IL a travels through the transparent rod while being totally reflected. This is the basic principle of optical fiber. However, the light coming from the air E in an oblique direction! Lb advances diagonally as shown in the figure. The two proceed on completely different optical paths. This phenomenon is harmless in the case of long-distance communication, and the light ray Lb diverges to the side and does not become an obstacle.However, in the present invention, the light ray Lb is emitted at close range, so the light ray Lb
The light becomes a halo-like diffused light, which blurs the outline of the screen and makes black areas muddy. Since the cause was clarified as described above, the above-mentioned problem was resolved by the means shown in the following figures. (Fig. 7) A group of transparent rods 30 is uniformly heated to near the softening point, and pressure perpendicular to the axis is applied to deform the cross section as shown in Fig. 7. As a result, the presence of air in the entrance section becomes minimal. (Fig. 8) When the group 3 of transparent rods 30 is made into a so-called "composite yarn" state in which transparent rods 30 and dark-colored filaments 9 are mixed,
The light rays traveling through the air often collide with the dark filament 9,
Light rays in the air are absorbed. (FIGS. 9 and 10) A dark paint 32 is applied to the cut surface 31, which is then polished to expose the cut surface 31 and finished as shown in FIG. 10. Dark film adhesive may be used instead of paint. In addition to the above, although not shown, the surface of the transparent rod 30 may be coated with a coating material as an optically separate body.

[Embodiment 2] FIG. 2 Similarly to Embodiment 1, a group 3 of transparent rods 30 is densely provided close to the curved surface of the front glass 5 of the cathode ray tube, and the tips of the transparent rods of adjacent cathode ray tubes are 4.40 are arranged in a direction approaching each other. The difference from Embodiment 1 is that the cathode ray tube is made smaller as a means of making the glass thinner, resulting in a large number of cathode ray tubes being stacked one above the other. For example, the scanning line width W is 41 Im, and the height of the large screen is about 2.
2 m, and if cathode ray tubes are stacked 10 times above and below, each cathode ray tube receiver will have 50 scanning lines, and the thickness of the glass will be T.
is required to be approximately 4 mm. If possible, it is desirable to set T<W to improve resolution. If there is a limit to the thickness T of the glass and it cannot be made thinner, stack more pieces, for example 15 pieces to make a screen with a height of 3.3 m, and the scanning line will be 6 mm, even if the glass is 6 + sm thick. As mentioned above, TOW is desirable as it approaches the practical range. The halation-like blur prevention means and transparent rod binding means described in the first embodiment are also common to the second invention. Also invention 1
Similarly, it is better to make the diameter d of the transparent rod smaller than the scanning line width W.

[Embodiment 3] As shown in FIG. 3, a small group of transparent rods 30 made of synthetic resin are tightened as a bundle B by a band 8,
The injection side is kept widening towards the end. The shape of the band 8 is a quadrilateral part, each of which is formed by four "trapezoid" pieces. The entrance surface 200 is tightened and deformed into a quadrilateral shape with almost no air present, and is formed into a concave surface that matches the convex surface of the front surface of the cathode ray tube. A transparent thin film may be attached to the incident surface 200 or a transparent agent may be applied thereto. Stack the desired number of bundles B, and stack the 12th bundle if necessary.
As shown in the figure (the cross-section is drawn with exaggerated thickness), bands 80 and 81 connecting each bundle are also added to join each bundle, and the injection side is aligned with the line X...X (Figure 1). Trim along. A transparent layer may be attached to the cut surface using a transparent adhesive.

Embodiment 4 An example of the manufacturing method of bundle B shown in FIGS. 13 to 18 will be explained. Synthetic resin transparent rod 3
Quadrilateral cylindrical temporary frame F made of synthetic resin that accommodates a small group of 0
A small group of transparent rods is stored in a dense manner. The temporary frame F may have a bottom or may be bottomless. In this embodiment, as the above temporary frame F, as shown in FIG.
A quadrilateral section with trapezoidal walls is made using a shape memory polymer that memorizes the shape of each piece into a trapezoid 60, and this is plastically deformed at room temperature to form a quadrilateral section with quadrilateral walls as shown in Figure 14. I made it and used it as a temporary frame F. 6 o tx i+i]
The transparent rods 30 are densely packed into this temporary frame F, and as shown in Fig. 15, four pieces of pressing material 50 are provided surrounding the temporary frame F, and the pressing material 50 is surrounded around the outer periphery. It was tightened with a rubber band (not shown). As shown in Fig. 16, each month of the pressing member is connected by a comb-like part 51, but it is designed so that the temporary frame F is finally tightened around the sloped line L...-L. . Therefore, the entrance side is narrowed down more and the exit side is narrowed down less. As described above, it was placed in a heating chamber with the rubber band tightened and heated using high-frequency waves. After heating and deforming the entrance surface 200 until the air is expelled, it is cooled and taken out, a transparent thin film is pasted on the entrance surface, a film is also pasted on the exit side to fix it, and the temporary frame F is removed to complete the transformation process. . Finally, the bundle was tied with band 8. Obi 8 is the third
As shown in the figure, each side is a trapezoid (or a slanted trapezoid as shown in FIG. 18) quadrilateral shape, and the small group of transparent rods is gripped in a shape that widens toward the end. The above method can compress the incident surface by about 5% in one side direction. However, for the purpose of shortening the length of the transparent rod and reducing the amount of transparent rod used, the 17th
As shown in the figure, the cross section of the transparent rod may be made into an "unusual cross section" to increase the amount of compression. For example, if it can be compressed by 10% in the - side direction, it can be made that much steeper and wider at the end. In that case, it can be made into a short transparent rod, which helps reduce weight. The figure is not an example of a cross-sectional shape; many different cross-sectional shapes are possible, as is well known in the textile industry. The longitudinal direction is a straight S shape. In the above embodiment, a shape memory synthetic resin was used as the temporary frame F, but a similar effect can be obtained by using a synthetic resin that heat-shrinks in the direction of the - side, although the effect may be inferior in some cases. , heat-softening synthetic resin may be used. This concludes the explanation of each embodiment corresponding to each claim. Although the cathode ray tube is used as the image receiving device in claims 1 and 2 and each of the embodiments, a large screen with inconspicuous seams can be obtained even if a liquid crystal image receiving device is used instead of the cathode ray tube. If the image receiving surface is flat, such as a liquid crystal, or if the image receiving surface is a gently convex surface, as in Embodiment 2, it is surrounded by a wall surface that is tilted in one direction and spread out (referred to as an inclined trapezoid), as shown in Fig. 18. Make it bundle B. Although the temporary frame F was used in the above-mentioned embodiment, a method of manufacturing the bundle without using the temporary frame F at all is also conceivable. Instead, the structure of the embossed material 50 becomes complicated, but this can be tolerated and the wall surface of the embossed material gradually becomes trapezoidal (or inclined trapezoid) as the transparent rod is heated and softened. The bundle B may be manufactured without using the temporary frame F by using a stamped material having a wall surface with a structure that can be deformed in a manner similar to the shape change of the shape memory resin. F 喀形ふ゛ ・ ； 連 Ｇ Ｇ Ｇ Ｇ Ｇ
ll. In general, cathode ray tubes for color TVs are gradually evolving into flat screens due to advances in technology, and the "extra forward bulge" mentioned in claim 1 means an extra bulge compared to the evolving technical level. means. Therefore, as the technological level improves, color TV screens will become flat, and the "extra bulge" for the purpose of making the glass thinner will also decrease in proportion to the flattening of color TVs. You can do less. However, the objectives of "flattening the screen" and "thinning the glass" are different, and it is inevitable that the two will always show a difference in the amount of bulge.

【effect】

■ Even in the case of a single image made up of a large number of cathode ray tubes arranged in parallel, black frames do not appear in adjacent areas of the cathode ray tubes. (2) According to invention 1, the glass of the cathode ray tube can be made thinner, and images with good resolution can be obtained. According to invention 3, the transparent rod group is composed of an accumulation of small groups, which makes it easy to manufacture and allows the structure to be made thin. According to invention 4, a bundle in which the transparent rods are uniformly spread toward the end can be obtained, and furthermore, if a transparent rod with an irregular cross section is used, a bundle that spreads out at a steep angle can be obtained, making it possible to shorten the length of the transparent rod and thereby make it lightweight. ■ Even assuming that it is possible to manufacture super-large cathode ray tubes, there is an advantage that the depth can be made shallower than the project type.

[Brief explanation of drawings]

1 to 4 are configuration diagrams showing essential parts of an embodiment of the present invention, and FIGS. 5 to 11 are explanatory diagrams explaining details of the present invention,
FIG. 12 to FIG. 18 are explanatory diagrams of the method for manufacturing transparent rod groups;
FIG. 19 is a sectional view of a conventional example. 1, io-・Cathode ray tube 2.20-image receiving surface 3.30
...Transparent rod group 4-...Transparent rod end 5...
Cathode ray tube front glass 7 - Frame 1 2 Figure 5 Figure 1 7 Figure 1 8

Claims (1)

[Scope of Claims] [1] In a screen display means in which a large number of color television picture tube-shaped cathode ray tubes 1 are arranged in parallel to form one large screen, a group 3 of transparent rods 30 is arranged in front of each image receiving surface 2 to receive an image. The transparent rods 30 are arranged in a dense manner on the surface 2, and the leading ends 4 of the transparent rods 30 are arranged in a direction in which the leading ends 4 of the transparent bars 30 are substantially in contact with the leading ends 40 of the transparent rods of the other image receiving surfaces 20 at the boundary where they touch the other image receiving surface 20, and the cathode ray tube The front glass 5 is made of thin glass that bulges out extra forward, and the length of the transparent rod 30 is short at the center of the glass and gradually increases toward the periphery of the large screen display device using a cathode ray tube. [2] In a screen display means in which a large number of color television picture tube-shaped cathode ray tubes 1 are arranged in parallel to form one large screen, a group 3 of transparent rods 30 are densely arranged on the image receiving surface 2 in front of each image receiving surface 2. The leading edge 4 of the transparent bar 30 is arranged in a direction in which the leading edge 4 of the transparent bar 30 is substantially in contact with the leading edge 40 of the transparent bar of the other image receiving surface 20 at the boundary where it touches the other image receiving surface 20, and the cathode ray tube is arranged on the large screen. It is small in comparison, and its size is such that it is constructed of a front glass whose thickness T is approximately not larger than the scanning line width W, and the length of the transparent rod 30 is short at the center of the glass. , a large screen display device using cathode ray tubes that gradually extend toward the periphery. [3] The transparent rod 30 is made of thermo-softening synthetic resin, and the transparent rod group 3 is composed of a large number of small bundles B of transparent rods, and the bundle B has an air content near zero on the incident surface 200. 3. A large screen display device using a cathode ray tube according to claim 1 or 2, wherein the cathode ray tube has a quadrilateral cross section compressed until it becomes flat, bound by a band 8, and gradually widens toward the exit side. [4] In the above manufacturing method of bundle B, a temporary frame F made of synthetic resin in the shape of a quadrilateral cylinder is provided to house small groups of transparent rods, the small groups of transparent rods are packed together, and the four surrounding temporary frame F are provided. The temperature is increased while pressing more on the entrance side and less on the exit side using a piece of pressing material 50, and the air is compressed and deformed until the air on the entrance surface 200 is expelled.Then, the temperature is lowered and the temporary frame F is removed, so that each side is trapezoidal ( 4. The method for producing a bundle of small groups of transparent rods according to claim 3, wherein the small groups of transparent rods are gripped in a shape that spreads toward the end by a quadrilateral cylindrical band 8 formed in a shape of a slanted trapezoid.