KR20080002428A - Back light structure and lquid crystal display device thereby - Google Patents

Abstract

A backlight structure and an LCD(Liquid Crystal Display) device having the same are provided to improve workability, reduce disconnection caused by the motion of the wire, and reduce the riskiness of a short circuit caused by spatial discharge between two narrow electrodes on the metal PCB. An LCD device comprises a lower cover(140), a metal PCB(120), a conductive member(210), a conductive wire, a light guide plate, a panel guide, and an LCD panel. The metal PCB is attached to the inside of a surface bent upward in the edge of a side of the lower cover and has the electrode parts of the positive pole and negative pole in at least one end. Plural LEDs are disposed and fixed on the metal PCB. The conductive member contacts the electrode parts of the metal PCB and has an arm connector attached to a portion where a voltage is flowed from an external power unit. The conductive wire has a male connector fastened to a female connector in an end. The other end of the conductive wire is connected to the external power unit. The light guide plate is loaded on the lower cover and induces light from the LEDs. The panel guide is fastened to the outline of the lower cover. The LCD panel is loaded on the panel guide.

Description

BACK LIGHT STRUCTURE AND LQUID CRYSTAL DISPLAY DEVICE THEREBY}

1 is an exploded perspective view of a navigation liquid crystal display device having a side type LED backlight according to the prior art;

FIG. 2 is a metal PCB in which the LEDs applied to FIG. 1 are fixed in an array unit. FIG.

3 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 4 is a view illustrating a metal PCB attached to an inner side of a lower cover of FIG. 3 and electrodes on the metal PCB contacting two conductive members, respectively.

FIG. 5 is a left side view of FIG. 4

6 is a metal PCB to which a wire drawing structure is applied according to another embodiment of the present invention;

7 is a metal PCB to which the wire drawing structure is applied in accordance with the remaining embodiments of the present invention

※※ Explanation of symbols for main parts of drawing ※※

120: metal PCB 140: lower cover

210: conductive member 220: mold

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight structure and a liquid crystal display device having the same, and more particularly, to a metal printed circuit board (PCB) having a plurality of light emitting elements fixed in an array unit backlight. The present invention relates to a structure for fastening or drawing a conductive wire in order to apply a voltage from the outside.

In general, a liquid crystal display (LCD) is a representative flat display device that displays an image by adjusting the amount of light transmitted to correspond to an image signal. However, in order to visually express an image on the back of the LCD screen because of the inability to emit light, a light source for emitting a predetermined light is required.

As such, a back light unit is a back-light unit, which is a power supply circuit for driving a light source including the light source itself, and a uniform flat light to irradiate light from the rear surface of the liquid crystal module to the liquid crystal panel. However, depending on the irradiation method of light, it is classified into two types of direct type and edge type backlight devices, and recently, various types of flat panel backlights employing surface light sources such as LEDs have been studied. .

Here, the edge type backlight device is a position of the light source is located on the side of the LCD module, the light from the light source forms a planar light through the light guide plate. This type of backlight is difficult to avoid deterioration in overall brightness. Therefore, in order to obtain a uniform distribution of luminance, a more efficient light induction system, that is, a system of inducing light from a relatively far distance from a light source, is required. Advanced optics was needed.

However, the thin backlight device is easy to manufacture, and despite the above-mentioned difficulties, it is still adopted in most portable display devices requiring relatively low power consumption, such as notebook PCs, personal digital assistants (NAV), navigation, etc. It is becoming.

In particular, the configuration of a general liquid crystal display device will be described using navigation as an example. 1 is an exploded perspective view of a navigation liquid crystal display device having a side type LED backlight. Looking at the configuration briefly, on the lower cover 40, a reflecting plate 26 for reflecting the light emitted from the LED to the liquid crystal panel of the front is attached, and the LEDs are arranged above and fixed at a predetermined interval above the metal PCB 20 and the light guide plate 24 are stacked in this order. Here, the metal PCB 20 is attached to the inside along the surface bent upward from the side of the lower cover 40, and toward the light guide plate, so that light emitted from the LEDs naturally flows into the light guide plate 24.

In addition, the optical sheets 28 and 32 are stacked on the metal PCB 20 and the light guide plate attached to the side of the lower cover 40, and the efficiency of light emitted from the reflective plate 26 and the light guide plate 24 is usually increased. The diffusion sheet 28 and the protection sheet 32 irradiated to the liquid crystal panel 10 are improved, respectively, and are composed of two sheets.

Meanwhile, a panel guide 30 of a frame mold is fastened to the outside of the lower cover 40 to maintain the balance of the overall force of the liquid crystal display and to space the liquid crystal panel by a predetermined distance.

And the panel guide 30 is loaded with a liquid crystal panel 10 for realizing an image, the detailed configuration of the thin film transistor array substrate and the color filter substrate bonded to maintain a uniform cell-gap facing each other, and It consists of liquid crystal injected between the two substrates.

In addition, the liquid crystal display device is completed by assembling and fastening the top cover 50 having a rectangular frame shape covering the edge of the liquid crystal panel 10 with the panel guide 30.

It should be noted that in the LED backlight device, as shown in FIG. 2, one (or both) ends of the metal PCB fixed to the array 20 are a kind of wires for supplying a constant voltage from the LED driver to the LED. Two strands of lead wire are soldered together, of which the red lead wire is connected to the anode of the LED and the black to the cathode of the LED. The lead wires are connected to the LED driving unit including the inverter on the back of the lower cover through a space formed at the rectangular corner of the lower cover.

As described above, in the structure of drawing two lead wires from one end of a metal PCB in which a plurality of LEDs are fixed in an array, a separate soldering process is performed. In this process, workability is very high due to the narrow distance between two electrodes. In addition to the deterioration, the soldered parts are exposed as they are, so there is a risk of disconnection due to the movement of the wire during assembly of the backlight. On the other hand, there is a risk of short circuit due to the space discharge between the two electrodes under high humidity environment. Will also be.

Therefore, the present invention firstly connects the electrode on the metal PCB and the wires from the LED drive through the connector, and secondly, using solder as in the prior art, but only protecting the portion using a separate rubber holder, Third, there is a purpose to improve the above problems by forming a hole in the lower cover to install a conductive member, and inserting a metal PCB between the lower cover and the conductive member.

And the achievement of this object can be more specific through the present invention. That is, the liquid crystal display according to the present invention includes a lower cover; A metal PCB attached to an inner side of a surface bent upward from one edge of the lower cover, having a plurality of light emitting elements arranged and fixed, and having a positive and negative electrode at least at one end thereof; A conductive member having a female connector attached to a portion of the metal PCB in contact with an electrode and receiving a voltage from an external power source; One end having a male connector fastened to the female connector, and the other end having a conductive wire connected to an external power source; A light guide plate mounted on the lower cover and inducing light from the light emitting element; A panel guide fastened to an outer portion of the lower cover; And a liquid crystal panel mounted on the panel guide.

 In addition, the backlight structure of the liquid crystal display according to the present invention includes a lower cover; A metal PCB attached to an inner side of a surface bent upward from one edge of the lower cover, having a plurality of light emitting elements arranged and fixed, and having a positive and negative electrode at least at one end thereof; A conductive member having a female connector attached to a portion of the metal PCB in contact with an electrode and receiving a voltage from an external power source; One end having a male connector fastened to the female connector, and the other end having a conductive wire connected to an external power source; And a light guide plate mounted on the lower cover and inducing light from the light emitting device.

On the other hand, the backlight wire drawing structure of the liquid crystal display device is attached to the inside of the bottom cover and the lower cover bent upward from one edge of the bottom surface, a plurality of light emitting elements are arranged and fixed, positive and negative at at least one end A metal PCB having an electrode portion thereof; A conductive member in contact with an electrode of the metal PCB and having a female connector attached to a portion at which a voltage from an external power source is introduced; And a male connector fastened to the connector at one end, and the other end is configured to include a wire connecting to an external power source.

Next, the configuration of the present invention will be described in detail with reference to the accompanying drawings. 3 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention. As can be seen in the figure, on the lower cover 140 is attached a reflecting plate 126 for reflecting light emitted from a light emitting element, for example, LED, to the liquid crystal panel 130 on the front side, and the LED above it again. They are arranged at regular intervals, and the metal PCB 120 and the light guide plate 124 fixed are sequentially loaded.

The metal PCB 120 is attached to the inside of the surface bent upward from one edge of the bottom cover 140, the positive and negative electrode portion on the metal PCB 120 is, for example, The cover 140 comes into contact with a conductive member such as a clip fixed to a hole at one corner of the bottom surface of the cover 140. Of course, the conductive member is a portion that receives a voltage from an external power supply to drive the LEDs on the metal PCB 120, so that a separate mold is attached to the surroundings for insulation from the conductive lower cover 140. do. In addition, this also serves to fix the conductive member.

As such, the LEDs are attached to the side surface of the lower cover 140 so that the light emitting part is directed toward the light guide plate, and thus the emitted light naturally flows into the light guide plate 124.

In addition, the optical sheets 128 and 130 are stacked on the metal PCB 20 and the light guide plate 124 attached to the lower cover 40, and the light emitted from the reflector plate 126 and the light guide plate 124 is usually disposed. The diffusion sheet 128, the protective sheet 130, and the like, which are irradiated to the liquid crystal panel 130 by improving efficiency, are each provided with two sheets.

On the other hand, the panel guide 150 of the frame mold is fastened to the outside of the lower cover 140 to maintain the balance of the overall force of the liquid crystal display and to space the liquid crystal panel by a predetermined distance.

The panel guide 150 is loaded with a liquid crystal panel 130 for realizing an image. The detailed configuration includes a thin film transistor array substrate and a color filter substrate bonded to maintain uniform cell gaps facing each other. And liquid crystal injected between the two substrates.

In addition, the liquid crystal display device is completed by assembling and fastening the top cover 150 having a rectangular frame shape covering the edge of the liquid crystal panel 130 with the panel guide 150.

FIG. 4 shows the metal PCB 120 attached to the inside of the lower cover 140 formed in a direction perpendicular to one edge and the electrode portions on the metal PCB 120 contacting the two conductive members, respectively. have. Above all, in the case of an LED used as a light source, a temperature increase of 20 to 30 ° C. may occur, and the metal PCB 120 may have a high heat dissipation property such as aluminum (Al) on the back side in order to improve the problems caused by this. The application of metallic materials helps to quickly release heat. Therefore, in view of this point, there is no need to doubt that the electrode portion is formed in the same direction as the light emitting portion of the LED and thereby comes into contact with the conductive member 210.

FIG. 5 illustrates a left side view of FIG. 4, between a conductive member 210 fixed in a hole formed at one corner of the bottom surface of the lower cover 140 and an inner surface of the lower cover 140 bent upward. The fastening part of the metal PCB 120 to be inserted is shown. As can be seen in the figure, the conductive member 210 is formed at an angle in the contact direction in order to allow the electrode portion on the metal PCB 120 and the conductive member 210 to contact. Of course, it is obvious that this set angle should be designed such that the inflection portion is in contact with the electrode portion, that is, the electrode height and lower cover on the lower cover 140 and the metal PCB 120 from the initial manufacture of the conductive member 210. The distance between the 140 and the member 210 and the like should be considered.

In addition, a portion of the conductive member 210 shown in the outer portion of the lower cover 140 in FIG. 5 is inserted into a separate female connector, for example, similar to the connector used for the fluorescent lamp, which is again an LED It is coupled to the male connector attached to the end of the wire connected from the power supply of the drive unit. Of course, such male and female connectors could be replaced with male and female DC jacks.

The wire drawing structure of the liquid crystal display device according to the present invention, which has been described so far, may be replaced by another method. In other words, as shown in FIG. 6, the electrode connector 310 of the metal PCB 120 attached inward along the surface bent upward from one edge of the lower cover 140 has been mentioned above. By attaching and attaching the male connector 312 to the end of the wire to help the application of power from the external power supply unit by fastening or coupling with each other can improve the LED backlight wire extraction structure. Of course, the wire to which the male connector 312 is attached is connected to an external power source through a space formed at a rectangular corner of the lower cover 140 although not separately shown in the drawing.

In addition, as shown in FIG. 7, the electrode portion of the metal PCB 120 attached inward along the surface bent upward from one edge of the lower cover 140 is soldered with an end of a wire to help apply power from an external power supply. In addition, by wrapping the part with a rubber holder made of a separate silicon (polyicon) or polycarbonate (polycarbonate) material can reduce the tension (tension) generated in the soldering site. In consideration of the ease of operation, it is preferable that the coated wire portion is formed so that the rubber holder surrounds the front surface of the wire, while the rubber holder covering the soldered portion is only formed in half.

As a result of this configuration, the workability can be significantly improved, and the risk of disconnection due to wire movement during backlight assembly can be reduced, and the risk of short circuit caused by space discharge between two narrow electrodes on the metal PCB will be reduced. .

Claims (19)

Lower cover; A metal PCB attached to an inner side of a surface bent upward from one edge of the lower cover, having a plurality of light emitting elements arranged and fixed, and having at least one end an electrode part of a positive electrode and a negative electrode; A conductive member in contact with an electrode of the metal PCB and having a female connector attached to a portion at which a voltage from an external power source is introduced; One end having a male connector fastened to the female connector, and the other end having a conductive wire connected to an external power source; A light guide plate mounted on the lower cover and inducing light from the light emitting device; A panel guide fastened to an outer portion of the lower cover; And And a liquid crystal panel mounted on the panel guide. The liquid crystal display device according to claim 1, wherein the conductive member is attached to a hole of the lower cover and additionally attaches a mold to prevent electricity supply to the lower cover. The liquid crystal display device according to claim 1, wherein the conductive member is composed of two clips for contacting an anode and a cathode on a metal PCB. 2. The liquid crystal display device according to claim 1, wherein the conductive member has a gap corresponding to a gap between the anode and the cathode on the metal PCB. The liquid crystal display device according to claim 1, wherein the conductive member is bent at an angle in a direction so as to be in contact with an anode and a cathode on a metal PCB. The liquid crystal display of claim 1, wherein the conductive member can be connected to an external power source by additionally using an adapter or a lamp connector at a portion of the lower cover. Lower cover; A metal PCB attached to an inner side of a surface bent upward from one edge of the lower cover, having a plurality of light emitting elements arranged and fixed, and having at least one end an electrode part of a positive electrode and a negative electrode; A conductive member in contact with an electrode of the metal PCB and having a female connector attached to a portion at which a voltage from an external power source is introduced; One end having a male connector fastened to the female connector, and the other end having a conductive wire connected to an external power source; And And a light guide plate mounted on the bottom cover and configured to guide light from the light emitting device. The backlight structure of claim 7, wherein the conductive member is attached to a hole of the lower cover and additionally attaches a mold to prevent electricity supply from the lower cover. 8. The backlight structure of a liquid crystal display device according to claim 7, wherein the conductive member is composed of two clips for contacting an anode and a cathode on a metal PCB. The backlight structure of a liquid crystal display device according to claim 7, wherein the conductive member has a gap corresponding to a gap between the anode and the cathode on the metal PCB. The backlight structure of a liquid crystal display device according to claim 7, wherein the conductive member is bent at an angle in a direction so as to contact the anode and the cathode on the metal PCB. The backlight structure of claim 7, wherein the conductive member may be connected to an external power source by additionally using an adapter or a lamp connector at a portion of the lower cover. A metal PCB attached to an inner side of a bottom surface and a lower cover bent upward from one edge of the bottom surface, a plurality of light emitting elements arranged and fixed, and having at least one end a positive and negative electrode portions;  A conductive member in contact with an electrode of the metal PCB and having a female connector attached to a portion at which a voltage from an external power source is introduced; And One end having a male connector fastened to the connector, and the other end having a wire connected to an external power supply unit. The backlight wire extracting structure of claim 13, wherein the conductive member is attached to a hole of the lower cover and additionally attaches a mold to prevent the lower cover from being energized. The backlight wire extracting structure according to claim 13, wherein the conductive member comprises two clips for contacting an anode and a cathode on a metal PCB. The backlight wire extracting structure of a liquid crystal display device according to claim 13, wherein the conductive member has a gap corresponding to a gap between an anode and a cathode on a metal PCB. The backlight wire extracting structure of claim 13, wherein the conductive member is bent at an angle in a direction so as to be in contact with an anode and a cathode on a metal PCB. A metal PCB attached to an inner side of a bottom surface and a lower cover bent upward from one edge of the bottom surface, a plurality of light emitting elements arranged and fixed, and having at least one end a positive and negative electrode portions;  A female connector attached to the electrode portion of the metal PCB; And One end having a male connector fastened to the connector, and the other end having a wire connected to an external power supply unit. A metal PCB attached to an inner side of a bottom surface and a lower cover bent upward from one edge of the bottom surface, a plurality of light emitting elements arranged and fixed, and having at least one end a positive and negative electrode portions; A wire soldered to an electrode of the metal PCB from an external power supply; And And a rubber holder surrounding the electrode portion of the wire.

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