TW396363B - Cathode ray tube for realizing high-brightness picture images - Google Patents

Abstract

A cathode ray tube includes a plate, a leak bucket type portion, an electrical gun, a cathode button, an accelerating electrode, and an electrical conductive metal wiring. The plate has a inner-phosphorescence screen. The leak bucket type portion is tightly sealed at the backside of the plate. The electrical gun is installed inside the neck of the leak bucket type portion to accelerate the electrical beam, so as to provide an accelerating electrode. The cathode button is situated on the grain type portion of the leak bucket type portion. The accelerating electrode discharges an accelerating voltage to the electrical gum. The electrical conductive metal wiring is located between the cathode button and the accelerating electrode of the electrical gun, which is used to electrically connect both of them. The electrical conductive metal wiring consists of a graphite film, which is coated on the inner surface of the leak bucket type portion, and multiple electrical conductive composites with low-resistance property between the cathode button and the accelerating electrode of electrical gun.

Description

V. Description of the invention (1) Related applications: This application is prior to Korean Patent Application No. 9 7-40894, which was filed on August 26, 1997. This case is hereby incorporated by reference. BACKGROUND OF THE INVENTION (a) Field of the Invention The field of the invention relates to a cathode ray tube (CRT) for realizing a high-brightness graphic image, and in particular, a CRT 'which can improve the focusing characteristics of an electron beam falling on a phosphor screen can be realized. High brightness graphic cathode ray tube. (b) Description of related technology Generally, the CRT is designed to excite the phosphor coated on the phosphor screen through the application of an electron beam emitted from the electron grab, and to reproduce the original graphic image on the glass screen. The CRT has recently been improved to accommodate high resolution And the need for high-quality graphic images in large-sized display screens of cathode ray tubes. And in order to meet this need, improving the brightness of the generated pattern cathode ray tube has become a very important factor in a number of technical issues " Nowadays, it has been proposed to use a flat display screen with high permeability characteristics during CRT manufacturing Or a phosphor screen coated with additional pigments or dyes to improve the characteristics of brightness. However, these technologies cannot increase the brightness ratio of the CRT display, and the production cost is also high. In particular, in the technique of applying additional pigments or dyes to the light-shielding screen, the 'coating procedure introduces complicated steps' and cannot be incorporated into the display screen processing steps of the conventional technique. Moreover, the pigments or dyes among them are excessively coated on the phosphor screen, so that the luminous efficiency of phosphor is deteriorated. Summary of invention

Jade, description of the invention (2) 'Therefore, the embodiment of the present invention is related to a CRT for realizing a high-brightness 囷 -shaped image. This CRT can actually avoid one or more of the problems caused by the limitations and disadvantages of related technologies. problem. The purpose of the embodiments of the present invention is to provide a display screen processing step which can improve the focusing characteristics of the electron beam falling on the phosphor screen to achieve a high-brightness graphic image and reduce the production cost, and is suitable for the conventional technology. The advantages of other features of the present invention can be understood from the following description, and are learned from the practical application of the present invention. The purpose of the present invention and its advantages can be achieved and achieved by the description in the text and the scope of application and the drawings. In order to achieve these and other advantages, the cathode ray tube includes: a plate with an internal phosphor screen; a funnel-shaped portion sealed on the back of the plate; and an electronic grab mounted on the neck of the funnel-shaped portion for emission The electron beam has an acceleration electrode to accelerate and impinge the electron beam onto the phosphor screen; an offset car on the periphery outside the funnel-shaped part to scan the electron beam on the disc light screen; A color selection mask behind the phosphor screen to ensure that each electron beam can strike the correct phosphor; an anode button on the granular part of the funnel-shaped part to conduct an acceleration voltage to the acceleration electrode of the electron grab; and a A conductive metal wire between the anode button of the electronic grab and the acceleration electrode is used to electrically connect the anode button to the acceleration electrode. The conductive metal wire includes a graphite film coated on the inner surface of the funnel-shaped portion, and a plurality of low-resistance conductive components located between the anode button and the acceleration electrode of the electronic grab. In addition, the conductive metal wire is formed by coating a powder metal film on the inner surface of the funnel-shaped portion. '

Ha C: \ ProgramFiles \ Patent \ 98P0137.PTD Page 5 V. Description of the Invention (3) '--------- Learn about the following heart description and detailed description are indicative and used for explanation' The scope of the patent further illustrates the invention. A simple explanation of the illustrated diagrams is intended to give readers an understanding of the present invention. 1 As part of the description in the humanities, 'the specific embodiments of the present invention and descriptions are used to explain the principles of the present invention, of which FIG. 1 is A schematic sectional view of a CRT according to a preferred embodiment of the present invention; FIG. 2 is a schematic view of a structure of a CRT electronic grab according to a preferred embodiment; FIG. 3 is an enlarged sectional view of a CRT conductive metal wire according to a preferred embodiment; FIG. 4 is a schematic cross section 圚 of a CRT according to a preferred embodiment of the present invention. In the following description, 'only the preferred embodiment of the present invention is shown and explained. This preferred embodiment is only for implementing the present invention and proposes a better mode for the inventor. It is understood that the present invention can be modified without departing from the spirit and perspective of the invention. Therefore, the drawings and description serve as proof, and are not intended to limit the present invention. DETAILED DESCRIPTION OF THE INVENTION Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic cross-sectional view of a CRT according to a preferred embodiment of the present invention. As shown in Figure i, 'CRT B includes a board 1 with an internal phosphor screen 3; a funnel-shaped portion 9 sealed on the back of the plate 1; an electron installed in the neck of the funnel-shaped portion 9 grabs G' to emit electrons Beam; an offset beam 5 'on the periphery of the funnel-shaped portion 9 to sweep the electron beam on the disc light curtain 3; and a color selection mask 7 directly behind the disc light curtain to ensure that each electron The beam can strike the required phosphorus. In addition, as shown in FIG. 2, a tripolar portion 13 and a main focus lens portion are applied.

C: \ ProgramFiles \ Patent \ 98P0137.PTD Page 6 V. Description of the invention (4) 15 forms an electronic grab. The triode part 13 generates an electron beam, coke electron beam E as a type, and is focused on the main lens part 15 to accelerate the electron beam E focused in advance to hit the phosphor screen 3.疋 Pre-focusless =, when the mirror part 15 is constructed by the focusing electrode 15a and the accelerating electrode 15b, the focusing electrode 15a receives the voltage from the socket connected to the tail of the electron grabbing 丨 丨 the voltage is in the range of 7 to 8KV and the acceleration electrode 15b is The anode button 17 from the granular portion of the funnel portion 9 receives an acceleration voltage of about 25 kv. In order to receive the operating voltage, a connection assembly 6 is provided to the acceleration electrode 5b, and this assembly has one end contacting the inner surface of the neck portion of the funnel-shaped portion 9. At the same time, a conductive metal wire 20 is provided between the anode button 17 and the neck portion of the funnel-shaped portion 9 of the connection assembly 16 connected to the acceleration electrode 15b. This conductive metal wire 20 electrically connects the anode button 17 to the acceleration electrode 151}. However, 'when the graphite film usually coated on the inner surface of the funnel-shaped portion 9 is only used as the conductive metal wire 20', the acceleration voltage fed from the outside to the anode button 17 is not completely transmitted to the acceleration electrode 15b because it is from the anode button 17 The reason why the resistance of the graphite film 19 to the acceleration electrode 15b reaches ΐοκΩ. Therefore, when the anode button 17 transmits an acceleration voltage of 25 KV through the graphite film 19 to the acceleration electrode i5b, the received voltage in the acceleration electrode 15b is reduced to 23 KV due to resistance. Therefore, the capacity of the accelerating electrode 15b can be reduced, and this accelerating electrode is used to accelerate and impinge the correct phosphor of the electron beam E on the phosphor screen 3. Therefore, the speed of the electron beam E becomes relatively low, and the spot size of the electron beam entering the phosphor screen 3 will be enlarged, resulting in deterioration of the entire electron beam focusing characteristics. This deterioration of the focusing characteristics means that the energy density of the electron beam E on the phosphor screen is dense.

C: \ ProgramFiles \ Patent \ 98P0l37.PTD Page 7 5. Description of the invention (5) The degree has decreased. As a result, the light emission efficiency is deteriorated, resulting in a decrease in brightness. Therefore, as shown in FIG. 3, in addition to the above-mentioned graphite film 19, the conductive metal wire 20 of the present invention is provided on the low-resistance conductive member 21. The low-resistance cage assembly 21 is positioned on the inner surfaces of the graphite 19 and the funnel-shaped portion 9. In this preferred embodiment, the number of the low-resistance conductive components 21 can be more than one. The low-resistance conductive member 21 has a line shape or a plate shape to electrically connect the anode button 17 to the acceleration electrode 15b. It is preferable to form a low-resistance conductive member 21 using a highly conductive metal such as iron, silver, and nickel. When the graphite film 19 and the low-resistance conductive component 21 are used as the conductive metal wire 20, the resistance of the conductive metal wire 20 ranging from the anode button 17 to the acceleration electrode i5b is less than 51 Ω 'so' acting on the acceleration electrode 5b The loss of acceleration voltage can be minimized. As a result, the velocity of the electron beam E becomes relatively high, and the spot size of the electron beam E on the phosphor screen can be minimized. Therefore, the electron beam e can collide with phosphorous having a high energy density, and a high-brightness graphic image can be realized on the screen. FIG. 4 is a schematic perspective view of a CRt according to a preferred embodiment of the present invention. In this preferred embodiment, a powdery metal film 23 'is coated on the inner surface of the funnel-shaped portion 9 instead of the graphite film 19 and used as a conductive metal wire 20. The powder metal film 23 is formed of a highly conductive powder metal such as iron, silver, and nickel. The resistance of the powdery metal film 23 ranging from the anode button 17 to the acceleration electrode 15b is also less than 5K Ω ', so that a high-brightness graphic image can be obtained on the display screen of the first embodiment. As described above, in the CRT of the present invention, the conductive metal wire 20 minimizes the acceleration voltage drop acting on the acceleration electrode 15b, and ensures that the electron beam e can be

C: \ ProgramFiles \ Patent \ 98P0137.PTD Page 8 V. Description of the invention (6) Fall on the high energy density phosphor screen. According to this method, the phosphor luminance on the phosphor screen can realize a high-brightness graphic image on the phosphor screen. Moreover, this way of increasing the brightness ratio of the CRT display screen can be applied to the processing steps of the display screen of a lower technology < this implementation which can be easily applied. Those skilled in the art can make various modifications to the CRT for realizing a high-brightness graphic image in the present invention without departing from the spirit and viewpoint of the present invention. Accordingly, this invention is intended to cover all modifications and variations that are provided within the scope of the patentable scope below and their equivalents in application.

C: \ ProgramFiles \ Patent \ 98P0137.PTD Page 9

Claims (1)

The funnel-shaped part of the neck; the electrons in the neck, speed the electrode to accelerate and knock-a board with an internal phosphor screen 'a seal on the back of the board, a sub-beam installed in the funnel-shaped part, the electron grab has-add light On the screen; Offset yoke on the fence, Electron beams located on the screen outside the funnel-shaped area; Color selection mask sub-beams directly behind the phosphor screen can strike the correct phosphor; Anode buttons on the, and transmission An acceleration electrode that accelerates the voltage at the granular part of the funnel-shaped part to the electron grabbing; wire 2. wire electricity 3. Conductor is used to emit an electric electron beam to the phosphor to scan the phosphorescence to ensure the electricity The conductive metal between the anode button of the electronic grab and the acceleration electrode is used to electrically connect the anode button to the acceleration electrode. For example, for a cathode ray tube in the scope of the patent application, the conductive metal includes a low-resistance graphite electrode coated on the inner surface of the funnel-shaped portion, and a plurality of anode buttons located on the sub-piston and the acceleration electrode. Conductive components. For example, the cathode ray tube of the second patent application range, wherein the low-resistance electrical component is linear or plate-shaped. 4. The cathode ray tube according to item 2 of the application, wherein the low-resistance conductive component is formed of a highly conductive metal material such as iron, silver, and nickel. 5. The cathode ray tube according to item 1 of the scope of patent application, wherein C: \ ProgramFiles \ Patent \ 98P0137.PTD Page 10 y 、、 Applicable patent scope = The inner surface of the shaped part is coated with _ powder metal film and belongs to the line. 6. If the cathode ray tube of the scope of the patent application item 5, the powdered metal of iron, silver and nickel forms a powder metal film 7. If the cathode ray tube of the scope of the patent application project, the anode button of the electronic grab to the acceleration electrode Between conductive gold) to 5K Ω. 8. For the cathode ray tube of the second patent application scope, the conductive metal between the anode button of the electron grab and the acceleration electrode is 5K Γ2. 9. For the cathode ray tube of the scope of application for patent No. 5, the conductive gold between the anode button of the electronic grab and the acceleration electrode forms the conductive gold, which is applied as 〇 where the resistance from the I line is small and the resistance from the ί line. Small in the range from