TW501367B - Method for television picture tubes contrast improvement - Google Patents

Abstract

The invention relates to a method of manufacturing a colour cathode-ray tube, in which a graphite coating of variable thickness is interposed between the glass faceplate of the tube and the phosphors intended to reproduce a colour image. The purpose of the coating is to reduce the transmission of the glass, of which the faceplate is composed, to a defined value.

Description

Item 367 V. Description of the invention (1)-One of the two inventions is about f, which is a combination of borrowing screens used in the manufacture of fluorescent screens for color cathode ray tubes. The present invention more specifically intends the pairing of images = anti & Rate? The visibility of the image formed by Wen Shan on the light screen of the light tube formed by the camp light screen can be seen in all lighting conditions that may occur in the home environment-a kind of high contrast A fluorescent screen is necessary. In order to improve the dagger formed on the light curtain of the cathode ray tube under the moon, a commonly used solution is to make the opposite of the image = first, between Wu's lines) a band of opaque carbon particles The beauty of the mouth and the mouth are improved by introducing a fluorescent screen, which is made of glass with a low transmission coefficient, and when the milk: the panel in the form of "species" has a dark appearance, this symbol: = Off = when this is the case, the use of glass with a low penetration coefficient is actually good for i. However, for example, the coefficient must be matched with the size of the tube; there are many problems. Category. To gradually increase the horizontal direction of the cathode ray tube, in order to be able to mechanically withstand the thickness of the true f-system that exists in the tube, it is the thickness of the board, especially at the corners. The thickness difference is very large. The conclusion is: for this = the central and its corners use a glass with a too low penetration coefficient, because the taste of the center and the sides, it is impossible to make the difference in yield too obvious for TV viewers. Other screens of light used to increase image contrast Surgery, such as between climbing and B light-emitting substance using several layers of the filter material, the inner ten Ying Guangmu ^ 'as described in US Patent No.

Page 4 501367 V. Description of the invention (2) No. 4,1 3 5, 11 2 It is a method that is difficult to implement and expensive; otherwise, it is a thin layer on the outside of the screen plus a layer of filtering Materials such as US Patent No. 4,987, 338 state that 'only when the tube is completed, it is also an expensive and applicable method. In addition, the thin layer is sensitive to chemical or abrasive attack. The object of the present invention is to provide a solution that is easy to implement and inexpensive, which allows the reflectance of the panel of a cathode ray tube to be reduced to a set value. To do so, the color cathode tube system according to the present invention includes a glass panel, an array of phosphors is arranged on the inner surface thereof to form a fluorescent screen, and the following characteristics are imparted to a thin layer of a light absorbing substance: A layer is placed between the phosphor and the inside surface of the panel to reduce the transmission coefficient of light passing through the panel. The invention and its advantages will be explained more clearly with the help of the following description and the illustrations interspersed therewith:-Figure 1 shows a cathode ray 図 g according to the invention: c said · / 1 丨 " Figures ... ^ ^ 刖 萤 萤 艺 的 萤 萤 image of Ying Yuan Qin Daiqi was produced on the inside surface of the glass panel of 5 Haiguan; Figure 3 shows a partial cross-section of a video screen according to the invention + meaning β- Series 4 is viewed from above the inside surface of a graphic glass panel according to the present invention.-Figure 5 is the same as before and after the drawing of the present invention, and its section from the inside surface of the cathode ray camp is 501367. 5. Description of the invention (4) In the program step, burn to remove. The front and back of the screen are mechanically subjected to mechanical stress. In the case of glass, the cost and weight of the panel must be changed. The propagation of the panel with low light transmission will then have the same energy as fluorescence at the edge. The value of the surface and the panel of the light propagation system of the deposition plate before the television sightseeing body. The thin film of the organic substance is caused by the fact that it is almost 3: 4 on the outer surface of the panel, and the shore transfer station: 传 The flat and novel fluorescent technology once again causes several problems. The vacuum generated in the tube, the panel breaks down. Second, it is necessary to avoid using a large amount of glass (based on = to be guaranteed, to maintain sufficient mechanical strength, and it is possible to sow; the number of quilts and the aridity should be less than the thickness of the edges. This means that the light is hidden through the difference of the camp light curtain; : The uneven sentence, this is because of the classic code of the fluorescent screen: the thickness at the edge of the U reduction is larger). The earlier redundancy of Θ is darker with the phase edges and corners provided by the squama. In the context, it is possible to use a highly transparent glass as a steamer to improve its appearance, by depositing a thin layer of phosphorous light-absorbing substance. In this way, the number of faces is modified to the desired value, which is made of dark glass, and the use of this thin layer is illustrated by Figures 3, 4 and 5. The f layer 22 is deposited on the glass panel 2 before the phosphor is deposited. This thin layer can be placed on a matrix array 2 of an opaque carbon column or exposed glass (if the screen does not contain Matrix array 21). The solution used to produce this thin layer is a graphite aqueous solution in a suspended state. It is better to dissolve it in small steps, because it has the following advantages: the thickness of the granular layer and the fine disc control layer. Transmittance and

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5. Description of the invention (5) Adjust it to the desired value according to the thickness. -The graphite particles fill the pores of the matrix 21, wherein the carbon particles have a larger diameter. As a result, the contrast of the fluorescent screen was improved, and the graphite band subsequently appeared darker. -The interface generated by the graphite layer 22 will produce an almost collapsing surface, and it is better to adhere the scale deposits to it than to the carbon ribbon directly to the substrate 21. Therefore, it is possible to increase the weight of the phosphor used to increase the brightness of the image on the screen without fear that the fluorescent substance may be separated due to its weight. 2 I = For some reasons, choose a suspension in which the graphite particles do not exceed a distribution range of 300 η ^; # ^ Λ u ^ J ~ 疋 状 疋 季 is good, for example, the graphite system used d A c π 0 s ο π Col loids Mountain # 徭 尔 的, 々y — person / 1 to choose from the carbon black products sold. The solution used contains the traditional preparation, production, and production of u u △ knives and surfactants, which are normally used in the manufacture of cathode-ray tube fluorescent screens. f The following table illustrates an example of a solution used to create a thick layer 2 2: Material concentration Graphite, 10% deionized water dispersant, 1% surfactant, 10% Table 1 0.5 99.25 0.05 0.2

SggggZfTO Percentage 500 8800 500 200 Different methods can be used to spray this method (take this as an example) / on the inner surface of the panel. Determine the final thickness of the thin layer, and the flow rate of the channel on the surface And the number will deposit a certain amount of ice in the center of the light curtain. This can be achieved by: dispersing each liquid in the fluorescent screen and dispersing it in the fluorescent screen by centrifugation.

501367 V. Description of Invention (7) The graphite concentration is on the order of 0.03 to 0.9%. Graphite concentration (percent by weight)% Luminous efficiency of panel pen tube [lumen / W] BCP center 0.00 42.7 2S. J 265 0.30 24.1 21.8 263 0.70 12.8 16.8 17.2 266 After drying the thin layer 2 2 by conventional methods, Each primary color phosphor is continuously deposited over the thin layer. The manufacturer provides a special advantage of sequentially depositing green, then blue, and then red phosphors, because these phosphors do not have the same efficiency and are the same energy provided by the corresponding electrons. In terms of green phosphors, they have the highest efficiency, followed by a monitor color phosphor, and finally a red phosphor. It follows that the electron flow must be corrected based on the energy to reproduce the color image faithfully, such as to obtain a near-real white color. This correction is based on the ratio of the currents from the electrons to obtain an informative image, and the present invention makes it possible to eliminate the corrective action of the ray current value by additional circuits to correct the (in the context of the manufacturing process ) The green phosphor is deposited first, then ..., and then the blue and two red fillers are deposited in a continuous and near-coherent method. After each development, i is exposed in the development stage 2 and the layer 22 becomes slightly thinner. It can be obtained that the thin layer 22 under the green phosphor is smaller than the thin layer under the blue phosphor in the same phosphor screen area. Now, the description of the invention (8) ^ And the thin layer 22 under the blue phosphor will be thinner than the red phosphor ^ 22 !! 'These thickness differences make various scales with a certain ray current available to A near uniform light yield becomes possible. It follows that the ratio of the ray currents used to produce the white is actually approaching 丨, thus eliminating the need for a circuit to correct the ray intensity. The present invention provides other advantages and solutions to related problems. * The argument that a more transparent glass panel can be used is beneficial to the environment and recycling of the end of life of the tube because the glass used contains less heavy metals, which are generally used to darken the glass. From the point of view of the worker, the present invention allows the manufacture of several pipes of the same type from the same broken glass, thereby providing flexibility and reducing production costs. Therefore, each type of panel must have the transparency suitable for its size and the inside of the tube: the transparency of the technology, after that, the final transparency was obtained by adjusting the thickness of 22. As a result, the manipulation of the material of the panel is correspondingly easier. Moreover, the present invention is not limited to the use of a graphite in a suspended state to produce a thin layer 22 'for the sake of convenience', graphite is preferentially selected. Therefore, the liquid material is generally used in the manufacturing stage of the tube. Any other substance with an element that absorbs light can be used as an alternative. ^

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Brief description of the figure Brief description of symbols Brief description 1 Cathode ray tube 2 Panel 3 Peripheral side edge 4 Funnel-shaped rear part 5 Rear end part 6 Electron gun 8 Color selection mask 10 Metal stand 11 Metal stand 12 Metal stand 13 Luminescent phosphor screen 19 Metal Bracket 20 Thin metal layer 21 With matrix 22 Graphite layer (or thin layer) 25 Red filler column 26 Green phosphor column 27 Blue phosphor column 50 Thin layer 22 Thickness 51 Thickness of panel 2 52 Thin layer Thickness of 22 53 thickness of panel 2

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Claims (1)

501367 Six specimens of this scene thick object case number 89121584 9L 6. 21; r jii ί 年% ^-月 ～ 二 声 4TW amendment application patent scope 1. A color cathode ray tube, which includes a glass panel, on the panel An array of phosphors is arranged on the entire surface of the substrate to form a type of fluorescent light, in which the phosphors are deposited on a thin layer of a light absorbing substance, the thin layer pattern reducing the transmission coefficient of light passing through the panel. 2. For example, the cathode ray tube of the scope of patent application, wherein the thin layer of the light absorbing substance is placed on an array trying to form an opaque substrate. 3. For the cathode ray tube of the scope of patent application, the first item The thickness of the thin layer of the light absorbing substance at the center of the screen surface is thicker than the thickness of the periphery of the thin film. 4. The cathode ray tube of item 1 of the patent application range, wherein the thin layer of the light absorbing substance is made of graphite particles Got. 5. For a cathode ray tube according to item 4 of the application, most of the graphite particles have a particle size of less than 0.3 microns. 6. A method for manufacturing a fluorescent screen of a cathode ray tube, wherein the method comprises the following steps:-cleaning the inside surface of the front surface of the tube;-depositing a suspension of particles of a light absorbing substance on the inside surface- The suspension is dried to form a continuous thin f-absorbing material f-depositing at least one layer of luminescent material on the thin layer. 7. The manufacturing method according to item 6 of the patent application, wherein the light absorbing material is graphite. O: \ 67 \ 67052-910619.ptc Page 13 501367 Case No. 89121584% Amendment t, Patent Application Range 8. For the manufacturing method of Patent Application No. 7, wherein the graphite suspension system contains dispersant and interfacial activity 9 重量 ％ 之间。 Agent, which is diluted in water, preferably deionized water, and the content of graphite is between 0.03 weight percent and 0.9 weight percent. 9. The manufacturing method of claim 7 or 8, wherein most of the graphite particles have a particle size of less than 0.3 microns. 10. The manufacturing method according to item 7 of the patent application range, wherein the graphite particle suspension is applied on the inner surface of the tube by spraying. O: \ 67 \ 67052-910619.ptc Page 14