KR200399912Y1 - Cold Cathode Fluorescent Lamp and Driving Device Therefor - Google Patents

Abstract

A cold cathode fluorescent lamp and a driving device thereof are provided for simplifying the manufacturing process and reducing the manufacturing cost.

The cold cathode fluorescent lamp of the present invention comprises a lamp tube in which an electrode is formed, a lead wire extending from the electrode to the end of the lamp tube, and first and second caps respectively fastened to the lead wire, respectively. Silver is a columnar shape having the same shape as the lamp tube, one end is open and the other end has a closed form formed with a lead wire fastening groove in the center, each lead wire is closed through the open side of the first and second cap The cold cathode fluorescent lamp driving apparatus of the present invention is guided and fastened to the lead wire fastening grooves at the side ends, and the cold cathode fluorescent lamp driving device of the present invention has a first common terminal and a plurality of cold cathode fluorescent lamps on which one side of the cold cathode fluorescent lamp fixed to the substrate is commonly connected A plurality of cold cathode fluorescent lamps connected between the second common terminal to be commonly connected and the first and second common terminals to supply or cut off a voltage between the first and second common terminals; And a drive for the parallel control.

According to the present invention, it is possible to obtain uniform luminance characteristics for the cold cathode fluorescent lamp, increase the lifespan, and reduce the size and manufacturing cost of the device.

Description

Cold Cathode Fluorescent Lamp and Driving Device Therefor

The present invention relates to a cold cathode fluorescent lamp and its driving apparatus, and more particularly to a cold cathode fluorescent lamp and its driving apparatus for simplifying the manufacturing process of CCFL and reducing the manufacturing cost.

Cold Cathode Fluorescent Lamp (hereinafter referred to as 'CCFL') has low power consumption, low heat generation, high brightness and long service life by operating at low current, and is used in monitors such as liquid crystal displays (TFT-LCD). It is applied to backlights, copiers, fax machines, scanners, and various test / inspection devices. In addition, CCFL is a light tube using a cold cathode emission phenomenon is easy to full color (Full color), the structure will be described with reference to FIG.

1 is a structural diagram of a typical cold cathode fluorescent lamp.

The CCFL 10 applies, for example, fluorescent material to an inner surface of a lamp tube 12 made of glass, and extends outward from the electrodes 13a and 13b and the electrodes 13a and 13b at both ends of the lamp tube 12. After the lead wires 14a and 14b are attached, the rare gas 15 and the net amount of mercury 16 are inserted and sealed.

After the CCFL is manufactured in this manner, when a high voltage is applied to the lead wires 14a and 14b, electrons present in the lamp tube 12 are attracted to the electrodes 13a and 13b at high speed, and the electrodes 13a and 13b are separated from the electrons. The discharge is started by the secondary electrons generated in the collision. Electrons emitted from the electrodes 13a and 13b collide with mercury atoms, and ultraviolet rays are generated due to the collision, and the ultraviolet rays excite the phosphor coated on the inner surface of the lamp tube 12 to generate visible light.

In order to connect the electrodes 13a and 13b and the lead wires 14a and 14b during the manufacturing of the CCFL, soldering is performed using a high voltage cable and an insulation tube is covered. Accordingly, the manufacturing process is complicated and takes a lot of time, the lead wire is exposed to the outside, there is a problem that the reliability of the device is degraded, such as cracks during assembly.

In addition, current display devices using CCFLs drive each of a plurality of CCFLs independently, thereby increasing the size of the driving device, thereby increasing the manufacturing cost, and as the number of CCFLs increases, this problem becomes more severe. There are disadvantages. In addition, since a plurality of drive devices are used, power consumption increases, and many wires are used for connection between the drive device and the CCFL, thereby degrading assembling.

The present invention has been made to solve the above problems and disadvantages, there is a technical problem to simplify the manufacturing process and improve the reliability of the device by closing both ends of the CCFL with a conductive cap.

Another technical problem of the present invention is to drive a plurality of CCFLs in parallel, thereby miniaturizing the CCFL driving apparatus and reducing the manufacturing cost.

Cold cathode fluorescent lamp of the present invention for achieving the above technical problem is a lamp tube is coated with a fluorescent material, a rare gas and a net amount of mercury is inserted, the electrode is formed; Lead wires extending from the electrode to the end of the lamp tube at both ends of the lamp tube; And first and second caps respectively fastened to the lead wires, each of the first and second caps having a column shape having the same shape as the lamp tube, and having one end open and the other end fastened to the center. The groove has a closed shape, and each of the lead wires is guided and fastened to the lead wire fastening grooves of the closed side ends through the open sides of the first and second caps, respectively.

In addition, the cold cathode fluorescent lamp driving apparatus of the present invention is applied to the lamp tube, the fluorescent material is coated, the rare gas and a net amount of mercury is inserted, the electrode is formed, the lamp tube from the electrode at both ends of the lamp tube A substrate having lamp fixing terminals to which both sides of a plurality of cold cathode fluorescent lamps each having a lead wire extending to an end of the lead and a first cap and a second cap fastened to the lead wire, respectively; Capacitors connected to both sides of the cold cathode fluorescent lamp, respectively; A first common terminal to which a plurality of capacitors connected to one side of the plurality of cold cathode fluorescent lamps are commonly connected; A second common terminal to which a plurality of capacitors connected to the plurality of cold cathode fluorescent lamps are commonly connected; And an inverter connected between the first and second common terminals to supply or cut off a voltage between the first and second common terminals to control the plurality of cold cathode fluorescent lamps in parallel.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a structural diagram of a cold cathode fluorescent lamp according to the present invention.

As shown, the CCFL according to the present invention is coated with a fluorescent material, a rare gas and a net amount of mercury are inserted, and the lamp tube 12 and the lamp tube 12 in which the electrodes 13a and 13b are formed. It consists of first and second caps 100a and 100b fastened to lead wires 14a and 14b extending from the electrodes 13a and 13b to the ends of the lamp tube 12 at both ends, respectively.

That is, in the CCFL according to the present invention, the lead wires 14a and 14b are sealed by the conductive caps 100a and 100b in order to solve a problem such that the lead wires 14a and 14b are exposed to the outside and are damaged. 14b) and the conductive caps 100a and 100b were soldered and fixed.

3A and 3B are structural diagrams of the cap shown in FIG.

3A shows a perspective perspective view of the caps 100a, 100b, and FIG. 3B shows a plan view. Caps (100a, 100b) has a columnar shape having the same appearance as the lamp tube 12, one end is open and the other end has a closed form formed with a lead wire fastening groove 110 in the center. When the caps 100a and 100b are fastened to both ends of the lamp tube 12, the lead wires 14a and 14b are respectively formed at the centers of the side ends closed through the open sides of the caps 100a and 100b. Guided to 110, the lead wires 14a and 14b and the caps 100a and 100b are fixed by soldering outside the caps 100a and 100b.

As such, by introducing the conductive caps 100a and 100b at the ends of the CCFL, it is not necessary to perform an additional soldering process or the like when fixing the CCFL to the substrate, and prevent the lead wires 14a and 14b from being damaged by external force. Can be.

4 is a structural diagram of a cold cathode fluorescent lamp driving apparatus according to the present invention.

As illustrated, the cold cathode fluorescent lamp driving apparatus includes a CCFL 10 on the substrates 20a and 20b (for example, a PCB substrate) and the substrates 20a and 20b on which both sides of the plurality of CCFLs 10 are fixed. Are formed in correspondence with the number of the lamps, and the lamp fixing terminals 22a and 22b for seating the CCFL 10 and capacitors 24a and 24b respectively connected to both sides of the CCFL 10 and the plurality of CCFLs 10, respectively. First common terminal 26a to which a plurality of formed capacitors 24a are commonly connected, Second common terminal 26b to which a plurality of capacitors 24b formed on the other side of the plurality of CCFLs 10 are commonly connected, and first and second And an inverter 28 connected between the two common terminals 26a and 26b to supply or cut off a voltage between the common terminals 26a and 26b.

Here, the capacitors 24a and 24b connected between the CCFL 10 and the common terminals 26a and 26b are preferably implemented by high voltage capacitors.

In the CCFL driving apparatus according to the present invention, the voltage supplied from the inverter 28 by the first and second common terminals 26a and 26b is applied to the plurality of CCFLs 10 in parallel. That is, since a plurality of CCFLs 10 can be controlled by only one inverter 28, manufacturing cost and device size can be reduced. In addition, the number of wires for connecting the CCFL 10 and the inverter 28 can be reduced, and the assembly process can be simplified.

As such, those skilled in the art to which the present invention pertains may understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is indicated by the utility model registration claims to be described later rather than the detailed description, and all changes or modifications derived from the meaning and scope of the utility model registration claims and equivalent concepts are included in the scope of the invention. Should be interpreted as

According to the present invention, by finishing both ends of the CCFL with a conductive cap, it is possible to obtain uniform luminance characteristics for each CCFL and to increase the lifespan.

In addition, by connecting a plurality of CCFLs in parallel and driving through a single inverter, it is possible to reduce the size and manufacturing cost of the device, and to stop the operation of all CCFLs when a small number of CCFLs in parallel failure occurs It is possible to continue to drive the CCFL in which no defect has occurred, thereby improving the reliability of the device using the CCFL as a light source.

1 is a structural diagram of a typical cold cathode fluorescent lamp,

2 is a structural diagram of a cold cathode fluorescent lamp according to the present invention,

3a and 3b is a structural diagram of the cap shown in FIG.

4 is a structural diagram of a cold cathode fluorescent lamp driving apparatus according to the present invention.

<Description of the symbols for the main parts of the drawings>

12: lamp tube 13a, 13b: electrode

14, 14b: lead wire 100a, 100b: cap

110: lead wire fastening groove 20a, 20b: substrate

22a, 22b: Lamp fixing terminal 24a, 24b: Capacitor

26a, 26b: common terminal 28: inverter

Claims (6)

A lamp tube to which a fluorescent substance is applied, a rare gas and a net amount of mercury are inserted, and an electrode is formed; Lead wires extending from the electrode to the end of the lamp tube at both ends of the lamp tube; And And first and second caps respectively fastened to the lead wires, Each of the first and second caps has a pillar shape having the same shape as that of the lamp tube, one end of which is open, and the other end of which has a closed shape in which a lead wire fastening groove is formed at the center thereof, and each of the lead wires includes the first and second caps. Cold cathode fluorescent lamps, characterized in that guided and fastened to the lead wire fastening grooves of the closed side end through the open side of the second cap. The method of claim 1, And the first and second caps and the lead wire are soldered and fixed, respectively. The method of claim 1, And the first and second caps are made of a conductive material. A fluorescent substance coated, a rare gas and a net amount of mercury are inserted, and a lead tube and lead wires extending from the electrode to the end of the lamp tube, respectively, at both ends of the lamp tube, in which electrodes are formed. A substrate having lamp fixing terminals on which both sides of the plurality of cold cathode fluorescent lamps having first and second caps fastened thereto are respectively fixed; Capacitors connected to both sides of the cold cathode fluorescent lamp, respectively; A first common terminal to which a plurality of capacitors connected to one side of the plurality of cold cathode fluorescent lamps are commonly connected; A second common terminal to which a plurality of capacitors connected to the plurality of cold cathode fluorescent lamps are commonly connected; And An inverter connected between the first and second common terminals to supply or cut off a voltage between the first and second common terminals to control the plurality of cold cathode fluorescent lamps in parallel; Cold cathode fluorescent lamp driving device having a. The method of claim 4, wherein The capacitor is a cold cathode fluorescent lamp driving device, characterized in that the high voltage capacitor. The method of claim 4, wherein Each of the first and second caps has a pillar shape having the same shape as that of the lamp tube, one end of which is open, and the other end of which has a closed shape in which a lead wire fastening groove is formed at the center thereof, and each of the lead wires includes the first and second caps. Cold cathode fluorescent lamp driving device characterized in that guided and fastened to the lead wire fastening grooves of the closed side end through the open side of the second cap.