KR100447237B1 - Method for insulation electrode back light of liquid crystal display device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of insulating a backlight electrode of a liquid crystal display device which simplifies the process and improves the reliability of the lamp in insulating the backlight electrode, wherein the liquid crystal comprises a plurality of light emitting lamps having electrodes at both ends. A backlight of a display device, comprising: connecting an electrode connection line to the electrode using a conductive adhesive or an electrode paste to contact at least 20% of the electrode length, and forming an insulating layer surrounding the electrode connection line and the electrode It characterized in that it comprises a.

Description

METHODS FOR INSULATION ELECTRODE BACK LIGHT OF LIQUID CRYSTAL DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight of a liquid crystal display (LCD), and more particularly to a method of insulating a backlight electrode of a liquid crystal display device suitable for improving the reliability of a lamp.

CRT (Cathode Ray Tube), one of the commonly used display devices, is mainly used for monitors such as TVs, measuring devices, information terminal devices, etc., but the miniaturization of electronic products due to the weight and size of CRT itself It was unable to actively respond to the demand for weight reduction.

Therefore, in the trend of miniaturization and light weight of various electronic products, CRT has a certain limit in weight and size, and is expected to be replaced. Liquid crystal display (LCD) and gas discharge using electro-optic effects Plasma Display Panel (PDP) and Electro Luminescence Display (ELD) using the electroluminescent effect, and the like, among them, research on liquid crystal display (LCD) is being actively conducted.

In order to replace the CRT, a liquid crystal display device having advantages such as small size, light weight, and low power consumption has recently been developed to be able to perform a sufficient role as a flat panel display device. As used in monitors and large information display devices, the demand for liquid crystal display devices continues to increase.

Since most of the liquid crystal display devices are light-receiving devices that display an image by controlling the amount of light source coming from the outside, a separate light source, that is, a back light, is required for irradiating light to the LCD panel. It is divided into edge type and direct type according to the location where the lamp unit is installed.

In this case, EL (Electro Luminescence), LED (Light Emitting Diode), CCFL (Cold Cathode Fluorescent Lamp), HCFL (Hot Cathode Fluorescent Lamp) are used. CCFL is widely used in large color TFT LCDs.

The CCFL light source uses a fluorescent discharge tube in which mercury gas containing argon, neon, or the like is sealed at a low pressure in order to use a pending effect. Electrodes are formed at both ends of the tube, and the cathode is formed in a wide plate shape.When voltage is applied, as in the sputtering phenomenon, charged particles in the discharge tube collide with the plate-shaped cathode to generate secondary electrons, which excite surrounding elements to excite the plasma. To form.

These elements emit strong ultraviolet light, which in turn excites the phosphor, causing the phosphor to emit visible light.

In the double-edge system, the lamp unit is installed on the side of the light guide plate for guiding the light, and the lamp unit covers a lamp emitting light, a lamp holder inserted into both ends of the lamp to protect the lamp, and an outer circumferential surface of the lamp It is provided with a lamp reflector plate fitted to the side of the light guide plate to reflect the light emitted from the lamp toward the light guide plate.

The edge method in which the lamp unit is installed on the side of the light guide plate is applied to a relatively small liquid crystal display device such as a monitor of a laptop computer and a desktop computer, and has good uniformity of light and a long service life. It is advantageous to thin the liquid crystal display device.

On the other hand, the direct method began to develop mainly as the size of the liquid crystal display device became larger than 20 inches, and arranged a plurality of lamps in a row on the lower surface of the diffuser plate to direct light directly to the front of the LCD panel. will be.

The direct method is mainly used for a large screen liquid crystal display device requiring high luminance because the light utilization efficiency is higher than that of the edge method.

However, the liquid crystal display device adopting the direct method is used as a large monitor or a television, which takes longer to use than a laptop computer, and because the number of lamps is larger, the failure and life of the lamp in the direct method than the edge method. It is more likely that a lamp that will not turn on appears.

In the direct method, because a plurality of lamps are installed on the bottom of the screen, for example, due to the life and failure of the lamp, if one lamp does not light up, the part where the lamp does not light up becomes significantly darker than the other part. The part will appear immediately on the screen.

For this reason, since the lamp is frequently replaced in the direct method, the lamp unit should be easily disassembled and assembled.

Hereinafter, a backlight of a conventionally proposed liquid crystal display device will be described with reference to the accompanying drawings.

1 is a perspective view illustrating a conventional direct backlight, and FIG. 2 is a view illustrating an electrode connection line connected to a conventional light emitting lamp and a connector.

As shown in FIG. 1, a plurality of light emitting lamps 1 having a phosphor coated on an inner surface thereof to emit light, an outer case 3 for fixing and supporting the light emitting lamps 1, and a light emitting lamp ( Light scattering means 5a, 5b, 5c disposed between 1) and the liquid crystal panel (not shown).

Wherein the light scattering means (5a, 5b, 5c) is to prevent the appearance of the light emitting lamp 1 on the display surface of the liquid crystal panel and to provide a light source having a uniform brightness distribution as a whole, to enhance the light scattering effect To this end, a plurality of diffusion sheets, diffusion plates, and the like are disposed between the liquid crystal panels.

In addition, a lamp reflector 7 is disposed on an inner surface of the outer case 3 so that the light emitted from the light emitting lamp 1 can be concentrated to the display unit of the liquid crystal panel, which is configured to maximize the use efficiency of light. do.

On the other hand, the light emitting lamp 1 is a cold cathode tube lamp, as shown in Figure 2, the electrode (2, 2a) for electrically conducting at both ends of the inside of the tube (Tube) is disposed, the electrode (2, 2a) When the power is applied, the light is emitted, and both ends of the light emitting lamp 1 are fitted in grooves formed on both sides of the outer case 3 as shown in FIG.

Both electrodes 2 and 2a of the light emitting lamp 1 have electrode connection lines 9 and 9a to which an external power source for driving a lamp is applied, and the electrode connection lines 9 and 9a are separate connectors 11. Is connected to the driving circuit. Therefore, a separate connector 11 is required for each light emitting lamp 1.

That is, an electrode connecting line 9 connected to one electrode 2 of the light emitting lamp 1 and an electrode connecting line 9a connected to the other electrode 2a are connected to one connector 11, and the electrode connecting line 9, Any one of 9a) is bent to the bottom of the outer case 3 and connected to the connector 11.

However, the above-described problems of the conventional LCD of the LCD have the following problems.

First, since the connector is connected to the electrode connecting line of the lamp and connected to the driving circuit, the connector is individually required for each light emitting lamp, and wiring is complicated.

Second, since the electrode connecting line is bent to connect with the connector for the purpose of reducing the thickness of the backlight, not only the work efficiency is lowered, but also a separate work is required for this, which increases the process time and the productivity.

Third, in order to connect the electrode and the connector, a hole penetrating the outer case must be drilled, and both electrodes of the light emitting lamp must be inserted into the hole so that both electrodes of the lamp are exposed to the outside of the outer case. Maintenance and repair of the lamp is difficult.

Fourth, the connection portion between the electrode and the electrode connection line is very small, and when the lamp is actually turned on, high temperature may occur in the electrode or, in severe cases, pin-holes may cause a fatal effect on the lamp, thereby degrading the reliability of the lamp.

The present invention has been made to solve the conventional problems as described above, simplifying the insulation process to insulate the electrode and at the same time to increase the contact area of the electrode and the electrode connection line to prevent the occurrence of pin-holes, etc. SUMMARY OF THE INVENTION An object of the present invention is to provide a method of insulating a backlight electrode of a liquid crystal display device to improve the performance of the backlight device.

1 is a perspective view showing a conventional direct backlight

2 is a view illustrating electrode connection lines connected to a conventional light emitting lamp and a connector;

Figure 3 is an external view showing a lamp constituting the backlight of the liquid crystal display according to the present invention

4 is an external view illustrating a lamp constituting a backlight of a liquid crystal display according to another exemplary embodiment of the present invention.

Explanation of symbols for the main parts of the drawings

21: light emitting lamp 22: electrode

23 electrode connection line 24 shrink tube

In the backlight electrode insulating method of the liquid crystal display device according to the present invention for achieving the above object, in the backlight of the liquid crystal display device comprising a plurality of light emitting lamps having electrodes at both ends, the conductive adhesive to the electrode Forming an insulating layer surrounding the electrode connecting line and the electrode using a sieve or an electrode paste to connect the electrode connecting line to be in contact with at least 20% of the electrode length.

In addition, the backlight electrode connection method of the liquid crystal display device according to another embodiment of the present invention for achieving the above object comprises a plurality of light emitting lamps having electrodes at both ends of the backlight electrode insulation A method, comprising: forming an electrode connection line electrically connected to the electrode, forming a shrink tube to surround the electrode and the electrode connection line, and applying heat to the shrink tube to fix the electrode connection line and the electrode. And bending the electrode at a predetermined angle.

Hereinafter, the backlight electrode connection method of the liquid crystal display according to the present invention will be described in detail with reference to the accompanying drawings.

3 is an external view showing a lamp constituting the backlight of the liquid crystal display according to the present invention.

As shown in FIG. 3, a phosphor is coated on the inner wall to form an electrode 22 made of a conductor so as to electrically conduct to both ends of the light emitting lamp 21 emitting light.

Subsequently, a contraction tube made of an insulator is formed by attaching an electrode connection line 23 electrically connected to the electrode 22 to apply an external power source and surrounding the electrode connection line 23 and the electrode 22. (24).

Here, the electrode connecting line 23 is formed such that at least 20% of the length of the electrode is in contact with the electrode 22, thereby increasing the contact area between the electrode connecting line 23 and the electrode 22, thereby increasing the high temperature generated in the electrode 22 and Solve problems such as pin-holes.

Then, heat is applied to the contraction tube 24 to fix the electrode connection line 23 and to closely contact the electrode 22.

At this time, by bending the shrink tube 24 while applying heat to the shrink tube 24, a shape as shown in FIG. 3 can be obtained.

Here, the angle of bending the contraction tube 24 can be freely adjusted at 0 ° ~ 90 ° depending on the use of the backlight.

When the electrode 22 is insulated using the above method, the use of a conductive adhesive or an electrode paste is not required between the electrode 22 and the electrode connection line 23, and the insulation method can be simplified.

Another embodiment of the invention is the case of using a lamp holder as an insulator.

Meanwhile, an insulating tape, an insulating paste, or the like may be used instead of the lamp holder as the insulator.

Here, the lamp holder is made of a material such as silicon and includes insulation and heat dissipation functions.

That is, FIG. 4 is an external view illustrating a method of insulating a backlight electrode of a liquid crystal display according to another exemplary embodiment of the present invention.

As shown in FIG. 4, an electrode connecting line 33 for applying external power to the light emitting lamp 31 having the electrodes 32 formed at both ends thereof is connected to the electrode 32, and the electrode 32 and the electrode connecting line. 33 is insulated using the lamp holder 34.

On the other hand, it is difficult to fix the electrode connecting line 33 to the electrode 32 with only the lamp holder 34 can be fixed to the electrode 32 using a conductive adhesive or electrode paste.

Here, the contact area between the electrode connecting line 33 and the electrode 32 is 20% or more of the length of the electrode formed at both ends of the light emitting lamp 31 to prevent the occurrence of potential and temperature unevenness of the electrode portion.

In addition, the contact portion of the electrode 32 and the electrode connecting line 33 may be in close contact with each other to prevent fine sparks between the electrode 32 and the electrode connecting line 33.

To this end, the fixing and adhesion of the electrode connecting line 33 and the electrode 32 may be improved by using a conductive adhesive or an electrode paste.

As described above, the backlight electrode insulation method of the liquid crystal display according to the present invention has the following effects.

First, the insulation of the entire electrode can be simplified by forming an insulating layer after forming the electrode connection line on the electrode.

Second, by increasing the contact area of the electrode and the electrode connecting line to prevent the occurrence of high temperature and pin-hole in the electrode can improve the reliability of the lamp.

Third, it is possible to close the electrode and the electrode connecting line as close as possible using a conductive adhesive or electrode paste to prevent the fine spark (spark) between the electrode and the electrode connecting line.

Claims (6)

In the backlight of a liquid crystal display device comprising a plurality of light emitting lamps having electrodes at both ends, Connecting an electrode connecting line to the electrode using a conductive adhesive or an electrode paste to contact at least 20% of the electrode length; And forming an insulating layer surrounding the electrode connection line and the electrode. The method of claim 1, wherein the insulating layer uses any one of an insulating tape, a lamp holder, and an insulating paste. delete delete In the backlight electrode insulating method of the liquid crystal display device comprising a plurality of light emitting lamps having electrodes at both ends, Forming an electrode connection line electrically connected to the electrode; Forming a shrink tube to surround the electrode and the electrode connecting line; Fixing the electrode connection line and the electrode by applying heat to the shrink tube; And bending the electrode at a predetermined angle. The method of claim 5, wherein the electrode is bent at 0 ° to 90 ° according to the use purpose of the backlight while applying heat to the contraction tube.