TWI345799B - A cold cathode fluorescent lamp - Google Patents

Description

1345799 IX. Description of the Invention: [Technical Field] The present invention relates to a charging and discharging tube, and more particularly to an electrode of a cold cathode fluorescent lamp. [Prior Art]

The backlight module is one of the key components of the liquid crystal display panel. Since the liquid crystal itself does not emit light, the backlight module is used to supply light with sufficient brightness and uniform distribution. Further, the liquid crystal display panel can display a normal and uniform display image.

A commonly used light source in a backlight module is a cold cathode fluorescent lamp (CCFL). Fig. 1A is a schematic view showing a conventional cold cathode fluorescent lamp. The cold cathode fluorescent lamp 1〇〇 includes a tube 1〇2 and two electrodes 104. The two electrodes 1 〇 4 are respectively disposed at two ends of the lamp tube 1 〇 2, and the light-emitting principle of the lamp tube 102 filled with metal and inert gas ◊ cold cathode fluorescent lamp 1 相似 is similar to that of a general fluorescent lamp, and the lamp tube 1 〇 2 The electrodes 1〇4 at the front and rear ends generate an electric field, and the free electrons impinge on the inert gas and then strike the gaseous mercury in the lamp tube. The mercury releases the invisible ultraviolet (UV) radiant energy due to the energy level change, and the fluorophore absorbs the radiant energy from the tube wall. After the radiation. Figure 1 is a schematic view showing the electrodes of a conventional cold cathode fluorescent lamp. As shown in Fig. 1, the electrode 1〇4 is a cylindrical metal component. The end of the cylindrical metal component is connected to the wire 106 for applying a voltage thereto. However, such conventional electrodes have a limited surface area of electrodes, so conventional cold cathode fluorescent lamps have problems such as poor luminous efficiency, high electrode temperature, high operating voltage, and short service life. 5 1345799 SUMMARY OF THE INVENTION Accordingly, an aspect of the present invention is to provide a cold cathode fluorescent lamp which increases the surface area of an electrode by changing the shape of at least one of the electrodes to increase the luminous efficiency of the cathode fluorescent lamp and lower the electrode temperature. Reducing the operating voltage and extending its service life According to a preferred embodiment of the present invention, the cold cathode fluorescent lamp comprises a lamp tube, a first electrode and a second electrode. The first electrode and the second electrode are respectively attached to both ends of the tube. The first electrode includes a first tubular electrode assembly and a second tubular electrode assembly. The second tubular electrode assembly is located within the first tubular electrode assembly and is electrically coupled to the first tubular electrode assembly. The present invention increases the surface area of the electrode by changing the shape of the electrode of a conventional cold cathode fluorescent lamp, for example, by increasing the number of tubular electrode assemblies. The larger the surface area of the electrode, the greater the number of electrons released by the bias voltage, so that the luminous efficiency of the cold cathode glory lamp can be increased. Furthermore, by increasing the surface area of the electrode for releasing electrons, a sufficient electron can be obtained using a lower operating voltage, and the electrode temperature is also reduced by a larger heat dissipation area and a lower operating voltage, and thus the length can be extended. The service life of cold cathode fluorescent lamps. [Embodiment] The present invention improves at least one electrode of a cold cathode lamp, such that the electrode has at least two tubular electrode assemblies to increase the surface area of the electrode. The electrode surface area is affected by the gas ion _. Therefore, the longer it takes for the electrode surface to be completely covered by gas ion sputtering, the longer its service life. Moreover, the larger the surface area of the electrode means the more electrons it can release, the more efficient the discharge is 6 1345799 (the efficiency is also higher. In addition, the larger the surface area of the electrode, the larger the area for the gas ion sputtering. The temperature generated on the electrode will also be lower. Fig. 2A is a schematic view showing a preferred embodiment of the present invention. The cold cathode fluorescent lamp 200 comprises a tube 202, a first electrode 204 and a second The electrode 205. The first electrode 204 and the second electrode 205 are respectively mounted on the two ends of the lamp 'tube 202' and are respectively connected to the two wires 206 for applying a voltage thereto. FIG. 2B is the first of FIG. A schematic diagram of the electrode 204. The first electrode 204 includes a first tubular electrode assembly 214 and a second tubular electrode assembly 224. The second tubular electrode assembly 224 is located within the first tubular electrode assembly 214 and is electrically connected thereto. The first tubular electrode assembly 214. In the preferred embodiment, the cold cathode fluorescent lamp 200 further includes a discharge gas 208 sealed in the bulb 202 for collision with electrons released by the electrode. Electrode assembly 214 The material of the second tubular electrode assembly 224 may include molybdenum, nickel, niobium or other conventionally applicable electrode materials. Further, the surfaces of the first tubular electrode assembly 214 and the second tubular electrode assembly 224 may be undulating to increase The electrode surface area of the first tube, the electrode assembly 214 and the second tubular electrode assembly 224 are substantially the same in the opening direction. However, the opening direction of the first tubular electrode assembly 214 and the second tubular electrode assembly 224 may also have An angle is used to optimize the discharge process. Further, the second electrode 205 can have the same structure as the first electrode 204 as shown in FIG. 2A, that is, the second electrode 205 also includes a first tube. The second electrode 2〇5 may also have a different structure from the first electrode 2G4, for example, the second electrode 2() 5 has a relationship with the electrode assembly 214 and a second tubular electrode assembly 22, or based on other factors such as different voltages. The conventional electrode 7 1345799 104 has the same structure. The 3A to 3G drawings are cross-sectional views of the first electrode 204 according to the section line AA' of FIG. 2A for explaining the first tubular electrode assembly and the first A variation embodiment of the plurality of different opening shapes of the two tubular electrode assemblies. The opening shape of the first tubular electrode assembly may be circular or polygonal, and the opening shape of the second tubular electrode assembly may also be circular or polygonal, and the first The shape of the openings of the tubular electrode assembly and the second tubular electrode assembly may be the same or different.

As shown in FIG. 3A, the first tubular electrode assembly

The circular shape of the second tubular electrode assembly 324a is circular, or as shown in FIG. 3B, the first tubular electrode assembly 31 has an open-angle shape, and the opening shape of the second tubular electrode assembly 324b is also As shown in Fig. 3C, the opening of the first tubular electrode assembly 314c: j is square, and the opening shape of the first tubular electrode assembly 324c is also: shape. Further, as shown in Fig. 3D, the first tubular electrode assembly 314d. has an opening shape of a square shape, and the opening shape 1 of the second tubular electrode assembly 324d has a circular shape, and both have different opening shapes. In addition to the general opening shape mentioned above, the first tubular electrode group, = and the opening σ shape of the second tubular electrode assembly may be other irregular shapes. As shown in FIG. 3, the 'first tubular electrode assembly' has an opening shape=a cross shape, and the opening shape of the second tubular electrode assembly 324e is called a strong shape or as shown in FIG. 3F, the first tubular electrode assembly 314f is also opened. The oxygen is in an irregular shape, and the opening of the tubular electrode assembly 324f is irregular. Even the __ group can go to the 3G chart, the first tubular electricity; the opening shape of the g The shape of the opening of the second tubular electrode group 8 1345799 * 324g is square. Figures 4 to 4C are diagrams illustrating several embodiments of the first electrode for illustrating the first Variations of the plurality of different opening angles of the tubular electrode assembly and the second tubular electrode assembly. The first tubular electrode assembly and the second tubular electrode assembly may have the same or different opening angles, for example, the opening angle of the first tubular electrode assembly may be Greater than, less than or equal to the opening angle of the second tubular electrode assembly. That is, the opening of the first tubular electrode assembly can be enlarged outward, inwardly or parallel, and the second tubular electrical and polar component The opening may also expand outwardly, inwardly or in parallel. As shown in FIG. 4A, the opening angle of the first tubular electrode assembly 414a is smaller than the opening angle of the second tubular electrode assembly 424a; or as shown in FIG. 4B. The opening angle of the first tubular electrode assembly 414b is greater than the opening angle of the second tubular electrode assembly 424b; or as shown in FIG. 4C, the opening angle of the first tubular electrode assembly 414c is equal to the opening of the second tubular electrode assembly 42 5A to 5B are diagrams showing several embodiments of the first electrode for explaining different variations of the lengths of the first tubular electrode assembly and the second tubular electrode assembly. The electrode assembly and the second tubular electrode assembly may have the same or different lengths, for example, the length of the first tubular electrode assembly may be greater than, less than, or equal to the length of the second tubular electrode assembly. As shown in Figure 5A, the first tubular electrode assembly The length of 514a is less than the length of the second tubular electrode assembly 524a; or as shown in Figure 5B, the length of the first tubular electrode assembly 514b is greater than the second tubular electrode set The opening angle of the piece 524b. Alternatively, as shown in the previous embodiments, the length of the first tubular electrode assembly 514a may be equal to the length of the second tubular electrode assembly of 9 1345799 I.* degrees. In the above 4A to In the embodiment shown in Fig. 5B, the outer side bottom of the second tubular electrode assembly is directly connected to the inner bottom of the first tubular electrode assembly. However, different connections between the other first tubular electrode assembly and the second tubular electrode assembly are also It can be used in the present invention. Alternatively, the first tubular electrode assembly and the second tubular electrode assembly may be integrally formed. FIGS. 6A to 6B illustrate several embodiments of the first electrode. Schematic illustration of a variant embodiment of the different connections of the first tubular electrode assembly and the second tubular electrode assembly. As shown in Fig. 6A, the second tubular electrode assembly 624a is located within the first tubular electrode assembly 614a. However, the first tubular electrode assembly 614a is electrically connected to the tube wall of the second tubular electrode assembly 624a, and a portion of the second tubular electrode assembly 624a protrudes beyond the first tubular electrode assembly 6Ma and is connected to the electric wire 606a. As shown in Fig. 6B, the second tubular electrode assembly 624b is located within the first % tubular electrode assembly 614b. However, the outer bottom portion of the second tubular electrode assembly 624b is not directly connected to the inner bottom σ|5 of the first tubular electrode assembly 6丨4b. Both the first tubular electrode assembly 624b and the first tubular electrode assembly 614b are electrically connected by a wire 606b. Figure 7 is a schematic view showing another preferred embodiment of the first electrode. In addition to the first tubular electrode assembly and the second tubular electrode assembly described above, the first electrode of the preferred embodiment may further comprise another third tubular electrode assembly. In other words, the first electrode comprising more than two tubular electrode structures is also in accordance with the spirit and scope of the invention. As shown in Fig. 7, the first electrode 704 includes a first tubular electrode assembly 714, a second tubular electrode assembly 724, and a third tubular electrode assembly 734. The second tubular electrode assembly 724 is located within the first tubular electrode assembly 714, and the third tubular electrode assembly 734 is located within the second tubular electrode assembly 724, and the three are electrically connected to each other. In summary, the skilled artisan can adjust the opening direction, the opening shape, the opening angle, the length or the connection manner of at least two tubular electrode assemblies, or increase the number of the tubular electrode assemblies, as required by the design and specifications. This increases the luminous efficiency of the cold cathode fluorescent lamp, lowers the electrode temperature, lowers the operating voltage, and prolongs its service life. Although the present invention has been described above in terms of a preferred embodiment, it is not intended to limit the invention, and the invention may be modified and varied without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood <RTIgt; 1B is a schematic view showing an electrode of a conventional cold cathode fluorescent lamp; FIG. 2A is a schematic view showing a preferred embodiment of the present invention; and FIG. 2 is a schematic view showing a first electrode of FIG. ; Figure 3A to flute I. The diagram is a cross-sectional view of the first electrode according to the section line A Α '; the 4A to 4C diagrams show the first embodiment of the first electrode 1345799 meaning 'to illustrate the first tube Variations of several different opening angles of the electrode assembly and the second tubular electrode assembly; FIGS. 5A-5B are schematic views showing several embodiments of the first electrode for illustrating the first tubular electrode assembly and the first Variations of different lengths of two tubular electrode assemblies;

6A to 6B are schematic diagrams showing several embodiments of the first electrode for explaining different embodiments of different connection modes of the first tubular electrode assembly and the second tubular electrode assembly; and FIG. 7 A schematic diagram of another preferred embodiment of the first electrode is shown. [Description of main component symbols] 100 : Cold cathode fluorescent lamp 102 : Lamp 104 : Electrode 106 : Wire 200 : Cold cathode fluorescent lamp 202 : Lamp 204 : First electrode 205 : Second 206 : Wire 214 : First Tubular electrode assembly

224: second tubular electrode assembly 314a, 314b, 314c, 314d, 314e, 314f, 314g: first tubular electrode assembly 324a, 324b, 324c, 324d, 324e, 324f, 324g: second tubular electrode assembly 414a, 414b, 414c : first tubular electrode assembly 424a, 424b, 424c: second tubular electrode assembly 514a, 514b: first tubular electrode assembly 12 1345799 524a, 524b: second tubular electrode assembly 606a, 606b: wires 614a, 614b: first tubular electrode Assembly 624a, 624b: second tubular electrode assembly wire 704: first electrode 706: 714: first tubular electrode assembly 724: second tubular electrode assembly 734: third tubular electrode assembly

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Claims (1)

1345799 X. Patent application scope: 1. A cold cathode fluorescent lamp comprising: a lamp tube; - a first electrode and a second electrode, respectively mounted on the two ends of the lamp tube, wherein the first electrode comprises: a first tubular electrode assembly; a second tubular electrode assembly located in the first tubular electrode assembly 2 and electrically connected to the first tubular electrode assembly, wherein the first tubular electrode assembly and the second tubular electrode assembly have different The cold cathode fluorescent lamp of the invention of claim i, wherein the first tubular electrode assembly of the qf and the opening direction of the second tubular electrode assembly are 3. The cold cathode fluorescent lamp of the first aspect of the invention, wherein the opening shape of the official electrode assembly is circular or polygonal. 4. If the cold cathode fluorescent lamp of the first item of the patent application is in the scope of the patent application, the shape of the opening of the Yindi-type electrode assembly is circular or polygonal. 5. The first is the same. 14 1345799. The cold cathode fluorescent lamp of the present invention, wherein: the second electrode of the second tubular electrode assembly is connected to the s-th electrode assembly. The inside bottom. The cold cathode fluorescent lamp of claim 1, wherein the surface of the first tubular electrode assembly is undulating. The cold cathode fluorescent lamp of claim 1, wherein the surface of the second tubular electrode assembly is undulating. 9. The cold cathode fluorescent lamp of claim 1, wherein the first tubular electrode assembly and the second tubular electrode assembly are integrally formed. 10. The cold as described in claim 1 A cathode fluorescent lamp, wherein the cold cathode fluorescent lamp further comprises a discharge gas sealed in the lamp tube. The cold cathode fluorescent lamp of claim 1, wherein the material of the first tubular electrode assembly and the second tubular electrode assembly comprises a turn, a brocade or a sharp. 15