KR100613652B1 - Direct LCD System - Google Patents

Abstract

A plurality of slide slots slightly larger than the lamp holder are alternately formed on one side and the other side in the width direction of the bottom chassis to insert the lamp units into the bottom chassis, and one end is connected to each source printed circuit board and the width of the bottom chassis is The FPC connectors, the other end of which is bent to the bottom surface of the bottom chassis along the outer side of the direction and are connected to the control board, are positioned in the non-sliding slots.

Therefore, in order to replace a lamp in which an abnormality occurs, when the lamp unit is pulled out of the LCD through the slide slot, only the lamp unit can be pulled out immediately without disconnecting the FPC connector from the control board. Workability is also improved.

In addition, since the physical stress is not applied to the FPC connector when replacing the lamp unit, the signal lines of the FPC connector are not broken, thereby improving the reliability of the product.

Lamp Unit, FPC Connector, Slide Slot, Control Board, Bottom Chassis

Description

Direct lighting type of liquid crystal display}

1 is a perspective view schematically showing the structure of a liquid crystal display device according to the present invention;

FIG. 2 is a cross-sectional view of FIG. 1 taken along line II-II.

3 is a cross-sectional view taken along line III-III of FIG. 1;

Figure 4 is an exploded perspective view showing a lamp unit separated from the bottom chassis according to the present invention.

The present invention relates to a direct type liquid crystal display device, and more particularly, a flexible printed circuit (FPC) connector for electrically connecting a source printed circuit board and a control board. The present invention relates to a liquid crystal display device of a direct type which is positioned between the units to facilitate replacement of each lamp unit.

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 due to the weight and size of the CRT itself, Could not respond actively to demands.

In order to replace the CRT, a liquid crystal display device having advantages of small size, light weight, and low power consumption has been actively developed, and recently, it has been developed enough to perform a role as a flat panel display device. In addition, as the monitor and the large information display device of the desktop computer is used, the demand for the liquid crystal display device is continuously increasing.

Since most of the liquid crystal display devices are light-receiving devices that display images by controlling the amount of light coming from the outside, a separate light source for illuminating the LCD panel, that is, a backlight assembly, is required. It is divided into edge type and direct type according to the installation position of the unit.

The edge method is installed on the side of the light guide plate where the lamp unit guides light.The lamp emits light, the lamp holder inserted at both ends of the lamp to protect the lamp, and the light emitted from the lamp It consists of a lamp reflecting sheet that reflects toward the light guide plate.

The edge type backlight assembly is mainly applied to a relatively small liquid crystal display device such as a monitor of a laptop computer and a desktop computer, and has good light uniformity, long durability, and thinning of the liquid crystal display device. It is advantageous.

On the other hand, as the size of the liquid crystal display device began to be enlarged to 20 inches or more, the direct development method began to focus on directly directing the LCD panel by placing a plurality of lamps on the lower surface of the diffusion plate.

Such a direct type backlight assembly is mainly used in a large screen liquid crystal display device requiring high brightness because the light utilization efficiency is higher than that of the edge method.

However, in the case of the liquid crystal display device adopting the direct method, since many lamps are installed on the lower surface of the diffusion plate, lamps that do not turn on due to the failure and life of the lamp are more likely to appear than the edge method.

In addition, due to the life and failure of the lamp in the edge method in which the lamp unit is installed on both sides of the light guide plate, for example, if only one lamp is not lit, only the brightness on the screen is lowered. However, in the direct method, since lamps are installed on the bottom of the screen, for example, when one lamp does not light up, a part where the lamp does not light up becomes dark due to lamp life and failure. Will appear immediately.

For this reason, lamps must be replaced frequently in direct backlight assemblies.

However, in order to replace a lamp that is not lit, it is necessary to separate the top chassis, the mold frame, and the mold frame and the bottom chassis surrounding the lamp unit, and then take out the lamp that is not lit and replace it with a new lamp. And workability is reduced.

In order to solve this problem, Korean Patent Application No. 99-825 discloses at least two lamp units, a slice slot is formed at a position corresponding to the lamp units on the side of the bottom chassis, and the slide slot is sided. The structure of a direct type liquid crystal display device closed by a cover has been proposed. In this structure, if there is a lamp to be replaced due to poor lighting of the lamp, remove the side cover from the bottom chassis, and then remove only the lamp unit with the lamp to be replaced through the slide slot to the outside of the bottom chassis to replace the lamp that is not lit. Replace.

However, even in such a structure, in order to replace a lamp, a control board for protecting the control board and an FPC connector for electrically connecting the source printed circuit board installed inside the liquid crystal display device and the control board installed outside the liquid crystal display device are provided. The replacement is still difficult because the lamp must be replaced after it has been removed from the base chassis and the side cover from the bottom chassis.

As the LCD panel becomes larger, two source printed circuit boards are installed at the widthwise ends of the LCD panel. Each source printed circuit board has a bottom chassis having one end of an FPC connector connected thereto and a slide slot formed from the source printed circuit board. This is because the other end of the FPC connector bent to the rear of the bottom chassis where the control board is installed is connected to the control board along the outer surface of the control board.

That is, to pull the lamp unit out of the bottom chassis through the slide slot, the FPC connectors passing through the upper side of the side cover are separated from the control board.

In addition, when the FPC connector is continuously removed and assembled from the control board to replace the lamp, there is a problem in that signal lines are broken due to physical stress at a predetermined portion of the FPC connector that is bent toward the control board from the bottom edge of the bottom chassis. .

Accordingly, an object of the present invention has been made in view of the above problems, it is possible to pull out the lamp unit to the outside of the bottom chassis through the slide slot without separating the FPC connector from the control board lamp replacement time of the lamp unit In order to reduce costs and improve workability.

Another object of the present invention is to prevent the signal lines of the FPC connector from being broken by physical stress.

Still other objects of the present invention will become more apparent from the following detailed description and the accompanying drawings.

In order to achieve the above object, the present invention includes a plurality of lamps having a hot electrode formed at one end and a cold electrode formed at the other end, and a hot side formed with a hot electrode and a cold side formed with a cold electrode. A plurality of lamp units including holders inserted into the lamps to protect the lamps are installed inside the frame, and slide slots of slightly larger size than the lamp holders are disposed at one side of the frame in the width direction of the frame and the other side thereof. It is formed by dividing a predetermined number on one side and the other side in the direction, each slide slot is provided with a means for closing the slide slot, and, in addition, the FPC connectors are one side of the width direction of the frame after one end is connected to the source printed circuit boards The other end is bent to the lower surface of the frame along the portion where the slide slot is not formed. It is connected to the board.

Preferably, the lamp support is further installed on the upper surface of the lamp holders fitted on the hot side and the cold side. A slightly higher and slightly wider locking plate is formed to close the slide slot.

Hereinafter, the liquid crystal display of the direct type according to the present invention will be described with reference to FIGS. 1 to 4.

As shown in FIGS. 2 and 3, the direct type liquid crystal display device 100 largely supports a display unit displaying information by the electrical and optical properties of liquid crystal, a backlight assembly supporting a display unit, and transmitting light to the display unit. And a control board 200 installed outside the backlight assembly and electrically connected to the display unit by the FPC connector 210 to transmit various control signals to the display unit.

Among them, the display unit is injected between the lower substrate 111 composed of gate lines, data lines, and thin film transistors, and the upper substrate 115 attached to the lower substrate 111, and the lower substrate 111 and the upper substrate 115. LCD panel 110 including liquid crystal, a gate printed circuit board (not shown) electrically connected by a gate driving drive IC to a longitudinal end of the LCD panel 110 in which the gate lines are arranged, and the LCD in which data lines are arranged. The panel 110 includes a plurality of source printed circuit boards 120 electrically connected to both ends of the panel 110 by the source drive IC 125.

Here, as the size of the LCD panel 110 increases, the source printed circuit board 120 is divided into two parts and attached to one end and the other end in the width direction.

On the other hand, the backlight assembly is the bottom frame 160, the bottom chassis 160, the bottom chassis is fastened to the bottom surface of the frame 150, the bottom surface of the frame 150 is formed with a rectangular through-hole from the upper surface to the lower surface The reflective plate 170 installed on the bottom surface of the 160 to reflect light, the lamp units 180 installed on the upper side of the reflecting plate 170 to emit light, and spaced apart from the lamp unit 180 by a predetermined interval, It is composed of a diffusion plate 220 installed on the upper portion of the 180 and diffuses the light and a top chassis 230 wrapping from the edge of the LCD panel 110 installed on the upper surface of the frame 150 to the side of the frame 150. .

Here, the lamp units 180 are divided into a plurality and installed in a line along the longitudinal direction of the bottom chassis 160. The reason why the lamp units 180 are divided into a plurality of lamp units 180 without being integrally formed is a plurality of lamps ( When an abnormality occurs in any one of the lamps 282, only the lamp unit 180 in which the abnormally occurring lamp 182 exists may be pulled out of the liquid crystal display device 100 to easily remove the lamp 180. To replace it.

As described above, the lamp units 180 divided into a plurality of lamps include a plurality of lamps 182 and one end of the lamps 182 used as a light source of the liquid crystal display device 100 as shown in FIGS. 2 and 4. Two lamp holders 184a and 184b fitted to the other end and protecting the lamps 182, respectively, and lamp supports 186 and 188 that are combined with respective lamp holders 184a and 184b to facilitate replacement of the lamp 182. ) And a lamp driver 195 electrically connected to the lamps 182 to light the respective lamps 182.

For convenience of explanation, each member constituting the lamp unit 180 will be described with reference to one lamp unit 180 as an example.

As shown in FIG. 2, one end of each lamp 182 protrudes from a hot electrode to which power is input, and another end of the lamps 182 protrudes to a predetermined length from a cold electrode to which the input power is returned. Four lamps 182 are installed in one lamp unit 180.

The two lamp holders 184a and 184b inserted into both ends of the lamps 182 are formed in a rectangular shape, and among the upper surfaces of the lamp holders 184a and 184b facing the diffuser plate 220, the lamps 182. Coupling holes for coupling the lamp holders 184a and 184b and the lamp supports 186 and 188 are formed between the inserted lamp insertion holes.

The first lamp holder 186 fitted to the cold side of the lamp among the two lamp supports 186 and 188 surrounds both longitudinal side surfaces of the lamp holder 184a from an upper surface thereof, and the lamp support 186 by vibration or shock. The coupling boss 187 protrudes from the inner surface of the lamp support 186 facing the coupling hole in order to prevent peeling easily from the lamp holder 184a.

The second lamp support 188 fitted to the hot side of the lamp 182 surrounds three surfaces except for one side facing the first lamp support 186 as shown in FIGS. 2 and 4, and the lamp holder ( A coupling boss 189 protrudes from an inner side surface of the lamp support 188 opposite to the coupling hole formed at 184b.

In addition, a locking plate 190 having a height and a width that is slightly wider than a portion 192 into which the lamp holder 184b is fitted is formed on a side facing the hot electrode, and the locking plate 190 is configured to cover the lamp units 180. When inserted from the side of the bottom chassis 160, the lamp unit 180 is prevented from completely flowing into the bottom chassis 160.

Preferably, the width of the portion 192 of the second lamp support 188 into which the lamp holder 184b is fitted is slightly wider than the width of the lamp holder 184b, so that the lamp holder 184b as shown in FIG. And a gap 194 having a predetermined length is formed between the hook plate 190 and the hook plate 190. The gap 194 is for pulling out the wire 196 connected with the hot electrode between the lamp holder 184b and the hook plate 190. .

As shown in FIG. 2, the lamp driver 195 electrically connects the electrodes of the inverter 199, the inverter 199, and the lamp 182 to convert a DC voltage input from an external device into an AC voltage and output the same. It consists of wires (196, 198) for supplying.

The plurality of lamp units 180 configured as described above are installed in the bottom chassis 160 as shown in FIG. 1, and the plurality of lamp units 180 is configured to have a second lamp unit 180 at a second cycle. The lamp support 188 is alternately positioned on one side and the other side in the width direction of the bottom chassis 160.

That is, in the case where the lamp unit installed on the left side in FIG. 3 is referred to as the "first lamp unit 180a" and the lamp unit installed on the rightmost side is referred to as "the fifth lamp unit 180e", as shown in FIG. Similarly, the second lamp supports 188 of the first, third, and fifth lamp units 180a, 180c, and 180e may be positioned on one side in the width direction of the bottom chassis 160, and the second and fourth lamp units ( The second lamp supports 188 of 180b and 180d are positioned at the other side in the width direction of the bottom chassis 160.

Meanwhile, as illustrated in FIGS. 1 and 4, the lamp unit 180 is attached to a portion corresponding to the second lamp support 188 on one side and the other side in the width direction of the bottom chassis 160. The slide slot 162 is formed to be easily taken out. The size of the opening 164 of each slide slot 162 is larger than that of the first lamp support 186 and smaller than the size of the locking plate 190, and the bottom chassis 160 is formed around the opening 164. A locking step 166 is formed to prevent the locking plate 190 from protruding toward the side of the bottom plate and to prevent the locking plate 190 from being introduced into the bottom chassis 160.

That is, the locking plate 190 serves to close the slide slot 162.

On the other hand, the control board 200 is installed on the lower surface of the outer surface of the bottom chassis 160, and is covered by a protective plate (not shown).

Finally, one end of the FPC connector 210 that electrically connects the source printed circuit board 120 and the control board 200 is connected to each source printed circuit board 120 and then the source printed circuit boards 120. From the lower side of the bottom chassis 160 is bent along the widthwise outer surface of the bottom chassis 160 in which the slide slots 162 are formed, and the other end is connected to the control board 200.

FPC connectors 212 and 214 of two of the four FPC connectors 210 are bent to the bottom along one widthwise side of the bottom chassis 160 as shown in FIG. 1, and two FPC connectors 212 and 214 are shown. Either FPC connector 212 is located between the slide slots 160, the first lamp unit 180a and the third lamp unit 180c is inserted, the other FPC connector 214 is the third lamp The unit 180c and the fifth lamp unit 180e are positioned between the inserted slide slots 160.

In addition, the remaining two FPC connectors 216 (one FPC connector is not shown) are bent to the lower surface along the widthwise other side of the bottom chassis 160, and two FPC connectors 216 and one connector are not shown. The FPC connector 216 is positioned at a portion corresponding to the first lamp unit 180a, and the other FPC connector is a slide in which the second lamp unit 180b and the fourth lamp unit 180b are inserted. Located between the slots 160.

The assembly of the liquid crystal display device and the lamp unit or the lamp replacement operation will be described as follows.

First, both ends of the lamps 182 are inserted into lamp insertion holes formed in the lamp holders 184a and 184b, and then wires 196 and 198 are connected to each of the hot and cold electrodes formed at both ends of the lamp 181.

Subsequently, the first and second lamp supports 186 and 188 are covered on the upper surfaces of the pair of lamp holders 184a and 184b, and the first lamp support 186 is fitted to the cold side of the lamp 210 ( 184a, and the second lamp support 188 covers the lamp holder 184b fitted on the hot side of the lamp 182.

In this case, the coupling bosses 187 and 189 formed inside the first and second lamp supports 186 and 188 are inserted into the coupling holes formed in the upper surfaces of the lamp holders 184a and 184b, and thus the lamp holders 184a and 184b and the lamp supports 186 and 188. ) Is completely combined.

Preferably, four lamps 182 are inserted into the pair of lamp holders 184a and 184b, and five lamp units 180 are usually installed in one liquid crystal display device 100.

Separately, a reflection plate 170 is installed on the bottom surface of the bottom chassis 160 to reflect the light emitted from the lamp unit 180 toward the diffusion plate 220.

When the reflecting plate 170 is installed on the bottom surface of the bottom chassis 160, the first lamp support 186 is formed in the opening 164 in the three slide slots 162 provided on one side in the width direction of the bottom chassis 160. The lamp holders 184a coupled thereto, and then push the lamp holders 184a to the other side in the width direction of the bottom chassis 160 of the first, third, and fifth lamp units 180a, 180c, and 180e. It flows inside.

Then, each of the slide slots formed on the other side in the width direction of the bottom chassis 160 is fitted with a cold side of the second and fourth lamp units 180b and 180d, and then is pushed toward one side of the bottom chassis 160 in the width direction. Five lamp units 180 are installed in a line in the longitudinal direction of the chassis 160.

At this time, when the five lamp units 180 are fully inserted into the bottom chassis 160, the respective slide slots 162 may be formed due to the locking plate 190 of the second lamp support 188 coupled to the hot side part. It is closed.

In this case, when the vibration or impact is applied to the liquid crystal display 100, the lamp units 180 may be pushed out of the bottom chassis 160 through the slide slots 162. By using the locking plate 190 is fixed to the side of the bottom chassis (160).

Subsequently, a diffuser plate 220 is installed on upper surfaces of the lamp units 180, a frame 150 is installed on the diffuser plate 220, and fastened to the bottom chassis 160. The display unit to which the FPC connectors 210 are coupled is installed on the upper surface of the 150.

Subsequently, the four FPC connectors 212, 214, 216 .. connected to the respective source printed circuit boards 120 are removed to the outer side of the bottom chassis 160, and then the top chassis 230 is covered with the top surface of the display unit. To the side of the.

In addition, the FPC connectors 212, 214, and 216 .. which are pulled out of the frame 150 are positioned on the rear side of the bottom chassis 160 after positioning the portion of the bottom chassis 160 in which the slide slot 160 is not formed. By bending to connect to the control board 200.

In order to replace the lamp 182 that is not turned on after driving the liquid crystal display device 100 assembled through the above-described process, the operator may fix the lamp unit 180 into which the lamp 182 that is not turned on is inserted. The screw is detached from the locking plate 190 closing the slide slot 162 in order to pull out the display device 100.

Then, the lamp unit 180 having the lamp 182 to be replaced is removed through the slide slot 162 to the outside of the bottom chassis 160 to replace the lamp 182 that is not lit with a new lamp 182. Then, the lamp unit 180 is inserted into the bottom chassis 160 again through the slide slot 162, and the locking plate 190 and the bottom chassis 160 are fixed with the screws 168.

As shown in FIG. 1, when the FPC connectors 210 are positioned between the slide slots 162, a lamp unit 180 in which an abnormality occurs without disconnecting the FPC connector 210 from the control board 200. To the outside of the bottom chassis 160.

As described above, in the present invention, a plurality of slide slots slightly larger than the lamp holder are alternately formed on one side and the other side in the width direction of the bottom chassis to insert lamp units into the bottom chassis, and the FPC connector is connected to the control board. In order to bend the FPC connector along the widthwise side of the bottom chassis, the FPC connectors are placed in the non-sliding slots.

Therefore, the lamp unit can be removed without removing the FPC connector from the control board when the lamp unit is pulled out of the liquid crystal display device through the slide slot to replace the lamp in which the abnormality occurs. The castle is also improved.

In addition, since the FPC connectors are not disconnected from the control board when the lamp unit is replaced, the signal lines of the FPC connector are not broken due to physical stress, thereby improving product reliability.

Claims (6)

Display unit including a LCD panel for displaying information by the electro-optical properties of the liquid crystal and a source printed circuit board is provided at least one at one end and the other end in the width direction of the LCD panel for applying an electrical signal to the LCD panel ; A bottom chassis in which a storage space is formed and a mold frame in which the display unit is fixed is disposed, a reflecting plate installed on a bottom surface of the bottom chassis to reflect light, and a length of the reflecting plate installed on an upper surface of the reflecting plate. A backlight assembly having a plurality of lamp units arranged along a direction to emit light and a diffuser plate disposed on the lamp unit to diffuse light; And In the direct type liquid crystal display device including a control board is installed on the bottom surface of the bottom chassis facing the bottom surface of the bottom chassis and electrically connected to the source printed circuit board by FPC connectors, Each of the lamp units includes a plurality of lamps having a hot electrode formed at one end thereof and a cold electrode formed at the other end thereof to emit light, and a hot side of the lamps formed with the hot electrode and a cold side formed with the cold electrode. Lamp holders fitted to protect the lamps, Slide slots slightly larger in size than the lamp holder are formed in the widthwise one side surface and the other side surface of the bottom chassis, the slide slot being divided into a predetermined number on the one side surface and the other side surface, and the slide slot Each of them is provided with means for closing the slide slot, The FPC connectors are bent to the bottom surface of the bottom chassis along one portion of the bottom chassis in one side and the other side of the bottom chassis in which the slide slot is not formed, and the other end thereof is connected to the source printed circuit boards. Direct-flow liquid crystal display, characterized in that connected to the board. The slide slots of claim 1, wherein the slide slots are formed alternately on one side of the bottom chassis and the other side of the bottom chassis to secure a space in which the FPC connector can be positioned on the side surface of the bottom chassis. Direct liquid crystal display device characterized in that the. The liquid crystal display of claim 1, wherein a hot side of the lamp unit is positioned at a portion where the slide slot is formed. The lamp holder of claim 1, further comprising lamp supports provided on upper surfaces of the lamp holders fitted to the hot side and the cold side to easily pull the lamp units out of the bottom chassis through the slide slots. Direct liquid crystal display device. The liquid crystal display device according to claim 4, wherein the means for closing the slide slot is a lamp support coupled to the hot side. The lamp holder of claim 5, wherein the lamp holder fitted to the hot side surrounds three surfaces of the lamp holder, and a locking plate is formed on a side facing the hot electrode slightly higher than the portion to which the lamp holder is fitted. And a slide slot to close the slide slot.

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