KR101442582B1 - Liquid crystal display device module - Google Patents

Abstract

The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device including an edge type backlight unit.

A feature of the present invention is that the cross-sectional shape of the cover bottom is bent in a substantially "C" shape along the longitudinal direction to form a bending portion, and the lamp is guided through the bending portion.

Thus, it is possible to protect the lamp and to concentrate the light emitted from the lamp in the direction of the light guide plate through the cover bottom, so that the existing lamp housing can be eliminated, and problems caused by the lamp housing can be prevented.

This can simplify the process and reduce the process cost.

Also, the power supply line of the lamp can be fixed through the support main without any additional components.

Cover bottom, lamp housing, support main, liquid crystal display

Description

[0001] The present invention relates to a liquid crystal display device module,

The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device including an edge type backlight unit.

2. Description of the Related Art In recent years, the display field has rapidly developed in line with the information age. In response to this trend, a flat panel display device (FPD) having a thinness, light weight, A plasma display panel (PDP), an electroluminescence display device (ELD), and a field emission display device (FED) : CRT).

Among these, the liquid crystal display device is excellent in moving picture display and is most actively used in the fields of notebook computers, monitors, TVs and the like due to its high contrast ratio. The liquid crystal display device does not have a self- And a light source is required.

Accordingly, a backlight unit having a lamp is provided on the back surface, and light is irradiated toward the front of the liquid crystal panel, thereby realizing an image of a brightness that can be recognized only through the backlight unit.

In general, an ordinary backlight unit is divided into an edge type and a direct type according to the arrangement structure of the lamp. The edge type has a structure in which one or a pair of lamps are disposed on one side of the light guide plate, Two or two pairs of lamps are disposed on both side portions of the light guide plate, and the direct type lamp has a structure in which several lamps are disposed under the optical sheet.

Here, the edge type has an advantage of being easier to manufacture than the direct type.

1 is an exploded perspective view showing a general LCD module.

As shown, a typical liquid crystal display module includes a liquid crystal panel 10, a backlight unit 20, a support main 30, a cover bottom 40, and a top cover 50.

The liquid crystal panel 10 is constituted by first and second substrates 12 and 14 which are in contact with each other with a liquid crystal layer interposed therebetween, which plays a key role in image display. The printed circuit boards 34a and 34b are connected to each other along two adjacent edges of the liquid crystal panel 10 via connecting members (not shown).

Upper and lower polarizers 19b and 19a are attached to the upper and lower surfaces of the liquid crystal panel 10 and a backlight unit 20 is provided behind the liquid crystal panel 10.

The liquid crystal panel 10 and the backlight unit 20 include a top cover 50 covering the top edge of the liquid crystal panel 10 and a backlight unit 20 in a state where the liquid crystal panel 10 and the backlight unit 20 are surrounded by a square main- And the cover bottoms 40 covering the back surface are joined at the front and rear sides, respectively, and are integrated through the support main body 30.

The backlight unit 20 includes a fluorescent lamp 24 arranged along the longitudinal direction of at least one side edge of the support main body 30 and including lamp holders 23a and 23b at both ends thereof, A reflective plate 22 of a white or silver color that is seated on the reflective plate 22, a light guide plate 26 seated on the reflective plate 22, and a plurality of optical sheets 28 interposed therebetween.

The lamp housing 29 is surrounded by the upper and lower sides of the fluorescent lamp 24 with the inner side opened toward the light guide plate 26, So that the light is concentrated in the direction of the light guide plate 26 together with the protection of the fluorescent lamp 24.

The light emitted from the fluorescent lamp 24 is incident on the side surface of the light guide plate 26 by the lamp housing 29 and is refracted in the direction of the liquid crystal panel 10. While passing through the plurality of optical sheets 28, And is supplied to the liquid crystal panel 10. The liquid crystal panel 10 has a high luminance.

On the other hand, in order to drive the fluorescent lamp 24, an AC voltage of a high voltage is used, and electromagnetic induction phenomenon is caused by such a high voltage. Accordingly, electromagnetic waves are generated in the lamp housing 29 made of a metal, which is in contact with the fluorescent lamp 24. Such electromagnetic waves periodically appear due to wave noise or the like, which hinders the operation characteristics of the liquid crystal display device.

For this purpose, the lamp housing 29 is provided with a separate U-shaped grounding structure 29a at both ends thereof for preventing electromagnetic waves, and the grounding structure 29a is connected to the cover bottom 40 via a fixing member (not shown) So that electromagnetic waves are shielded.

However, it is very difficult to form a separate grounding structure 29a at both ends of the metal lamp housing 29, and the cover bottom 40 is also used for grounding the lamp housing 29, The structure of the housing 29 should be changed according to the grounding structure 29a.

This provides a cause for increased process costs.

In addition, since the fixing member (not shown) such as a screw is fastened when the lamp housing 29 is grounded, the process time is increased and the process cost due to the consumption of the fixing member (not shown) is further increased.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to solve the problems caused by the lamp housing, to protect the fluorescent lamp, which is an inherent role of the lamp housing, and to concentrate the light emitted from the fluorescent lamp toward the light guide plate As a first object.

A second object of the present invention is to simplify the process of the liquid crystal display module and to reduce the process cost.

According to an aspect of the present invention, there is provided a liquid crystal display comprising: a liquid crystal panel; A plurality of optical sheets interposed under the liquid crystal panel; A light guide plate provided below the plurality of optical sheets; A fluorescent lamp arranged along one longitudinal edge of the light guide plate and having a pair of lamp holders surrounding the electrode portions at both ends; The cover bottom includes a cover bottom having a banding portion in which the fluorescent lamp is mounted. The lamp holder has a first locking protrusion, and a bending portion of the cover bottom has a locking hole into which the first locking protrusion is inserted. And a liquid crystal display device.

Wherein the cover bottom has a horizontal surface on which the light guide plate is mounted, a first bending surface protruding upward along a longitudinal direction of the first surface, and a second bending surface perpendicular to the first bending surface and parallel to the horizontal surface, And the latching hole is formed on the second bending surface.

Further, it is preferable that the second locking protrusion further comprises the second locking protrusion, and the second locking protrusion is in contact with one side edge of the second bending face, and the first and second locking protrusions are made of the same material as the lamp holder .

At this time, a reflection film is formed on the inner surface of the bending part, and the reflection film is one of a synthetic resin or a reflection sheet.

The liquid crystal display module may further include a support main body having a wire mounting groove formed at one side thereof so that a power supply line extending from the lamp is wound and mounted, wherein the wire mounting grooves are spiral .

In addition, the wire mounting grooves may be provided at the center thereof with a latching end for hooking and pulling out the power supply line, and an opening through which the power supply line can be drawn out is formed on a horizontal plane of the cover bottom .

At this time, the fluorescent lamp is characterized in that at least two fluorescent lamps are arranged in a multi-layered structure, and a top cover is assembled with the cover bottom.

As described above, according to the present invention, the cross-sectional shape of the cover bottom is bent in a substantially "C" shape along the lengthwise direction of one edge to constitute a bending portion and the lamp is guided through the bending portion, It is possible to prevent the problems caused by the conventional lamp housing, and it is possible to simplify the process and reduce the process cost.

Further, there is an effect that the power supply line of the lamp can be fixed through the support main without any additional additional components.

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

2 is an exploded perspective view illustrating a liquid crystal display module according to an embodiment of the present invention.

The liquid crystal display module includes a liquid crystal panel 110, a backlight unit 120, a support main body 130, a cover bottom 140, and a top cover 150.

First, the liquid crystal panel 110 plays a key role in image display and includes first and second substrates 112 and 114 which are bonded to each other with a liquid crystal layer interposed therebetween.

At this time, a plurality of gate lines and data lines intersect on the inner surface of the first substrate 112, which is usually called a lower substrate or an array substrate, although a pixel is not clearly shown in the figure, And a thin film transistor (TFT) is provided at each intersection point, and is connected to the transparent pixel electrode formed in each pixel in a one-to-one correspondence manner.

On the inner surface of the second substrate 114, which is called an upper substrate or a color filter substrate, color filters of R, G, and B colors corresponding to the respective pixels, a gate line and a data line, And a black matrix covering a non-display element such as a thin film transistor is provided. In addition, a transparent common electrode covering these elements is provided.

The printed circuit boards 134a and 134b are connected to each other along at least one edge of the liquid crystal panel 110 via a connection member such as a flexible circuit board so that the side of the support main 130, (140).

At this time, a gate driving circuit for transferring the on / off signals of the thin film transistors to the gate lines and a data driving circuit for transferring the image signals for each frame to the data lines are positioned at two adjacent edges of the liquid crystal panel 110.

In the liquid crystal panel 110 having the above-described structure, when the thin film transistor selected for each gate line is turned on by the on / off signal of the gate driving circuit to be scanned, the signal voltage of the data driving circuit flows through the data line And the alignment direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode, thereby exhibiting a difference in transmittance.

Although not clearly shown in the drawing, an upper and a lower alignment film (not shown) for determining the initial alignment direction of the liquid crystal are interposed between the two substrates 112 and 114 of the liquid crystal panel 110 and the liquid crystal layer A seal pattern is formed along the edges of both substrates 112 and 114 to prevent leakage of the liquid crystal layer filled therebetween.

At this time, upper and lower polarizers 119b and 119a selectively transmitting light in a specific direction are attached to the outer surfaces of the first and second substrates 112 and 114, respectively.

A backlight unit 120 is provided to supply light from the rear surface of the liquid crystal panel 110 so that the difference in transmittance represented by the liquid crystal panel 110 is externally displayed.

The backlight unit 120 includes a lamp 124 arranged along the longitudinal direction of at least one edge of the support main 130, a white or silver reflective plate 122 seated on the cover bottom 140, , And a plurality of optical sheets 128 interposed therebetween.

At this time, the lamp 124 is a cold cathode fluorescent lamp. At the both ends of the lamp 124, a pair of lamp holders 123a And 123b.

The light guide plate 126 allows the light incident from the lamp 124 to spread evenly over the wide area of the light guide plate 126 by progressing through the light guide plate 126 by total reflection several times, to provide. The light guide plate 126 may include a pattern of a specific shape on the back surface to supply a uniform surface light source.

The reflection plate 122 is disposed on the back surface of the light guide plate 126 and reflects light passing through the back surface of the light guide plate 126 toward the liquid crystal panel 110 to improve the brightness of light.

The optical sheet 128 on the light guide plate 126 includes a diffusion sheet and at least one light condensing sheet to diffuse or condense light passing through the light guide plate 126 to provide a more uniform surface light source to the liquid crystal panel 110 .

Meanwhile, the backlight unit 120 having the above-described structure is generally called a side light type, and a plurality of lamps 124 are arranged in multiple layers along the longitudinal direction of at least one edge of the support main body 130 It is also possible to arrange them in parallel along the inner longitudinal lengths of the opposite sides of the support main 130 facing each other.

Although not shown in the drawings, a backlight driving circuit (not shown) for controlling the on / off of the lamp 124 is formed in close contact with the back surface of the cover bottom 140.

The liquid crystal panel 110 and the backlight unit 120 are modularized through the top cover 150, the support main body 130 and the cover bottom 140. The top cover 150 covers the upper surface and the side surface of the liquid crystal panel 110, And the front cover 150 is opened to display an image to be displayed on the liquid crystal panel 110. The liquid crystal panel 110 may be a liquid crystal panel.

The support main body 130 covering the edges of the liquid crystal panel 110 and the backlight unit 120 may be made of a synthetic resin molding material and may prevent the power supply line The power supply line fixing structure 133 is formed.

The cover bottom 140 is bent in a substantially "c" cross-sectional shape along the horizontal plane of the plate shape and the longitudinal direction of the edge thereof to form the bending portion, and the lamp 124 is guided through the bending portion do.

Therefore, the fluorescent lamp 124 can be protected from external impact while concentrating the light emitted from the lamp 124 through the cover bottom 140 to the side of the light guide plate 126. FIG. 3, which shows the details in detail, will be described in more detail with reference to FIG.

FIG. 3 is a perspective view of a cover bottom according to an embodiment of the present invention, and FIG. 4 is an enlarged view of a region A of FIG.

As shown, the cover bottom 140 provides a horizontal surface 141 on which the backlight unit (120 in FIG. 2) and the support main (130 in FIG. 2), including the liquid crystal panel It serves as a subframe that supports the entire device module while minimizing light loss.

That is, the cover bottom 140 includes a horizontal surface 141 adhered to the back surface of the backlight unit 120 (see FIG. 2), a first bending surface 143a and a first bending surface 143a vertically protruding upward along the longitudinal direction of the first bending surface 143 And a second bending surface 143b which is perpendicular to the first surface 143a and parallel to the horizontal surface 141. [

Thus, the bending portion 143 of the cover bottom 140 is mounted along the inner longitudinal direction of the bending portion 143 with the inner side facing the light guide plate (126 in Fig. 2) opened.

Thus, the bending portion 143 surrounds the upper and lower sides of the lamp 124 and concentrates the light toward the light guide plate (126 in FIG. 2) together with the protection of the lamp 124.

On both sides of the second bending surface 143b, a latching hole 149a for fixing the lamp 124 is formed.

FIG. 5A is a view schematically showing a state before the lamp is mounted on the bending portion of the cover bottom, and FIG. 5B is a view schematically showing a state where the lamp is mounted on the bending portion of the cover bottom.

Referring to FIG. 3, a pair of lamp holders 123a and 123b is provided at an electrode portion of both ends of the lamp 124. The lamp holders 123a and 123b are used to fix the electrodes of the lamp 124 And a power supply line (not shown) is soldered to the groove (not shown) so that the electrode of the lamp 124 can be connected to an external power source.

These lamps 124 are inserted in a sliding manner through one opened side of the bending portion 143 of the cover bottom 140. The lamps 124 are inserted from one side of the lamp holders 123a and 123b provided at both ends of the lamp 124, The first protrusion 121a protrudes upward and is brought into close contact with the inner surface of the second bending surface 143b of the cover bottom 140, and then protrudes from the top surface thereof.

That is, a first locking protrusion 121a is formed on one surface of the lamp holders 123a and 123b that abuts the second bending surface 143b of the cover bottom 140, The bending surface 143b is provided with a latching hole 149a through which the first latching protrusion 121a can be inserted.

Therefore, the first engaging protrusion 121a of the lamp holder 123a is aligned with the engaging hole 149a of the second bending face 143b, and then the first and second engaging protrusions can be engaged with each other by applying pressure.

The first and second latching protrusions 121a and 121b are formed on one surface of the lamp holders 123a and 123b at a predetermined distance from the first latching protrusion 121a. 121b is configured to be equal to the distance between the latching hole 149a of the second bending face 143b and one side edge of the second bending face 143b. Accordingly, the second locking protrusion 121b supports one edge of the second bending face 143b of the cover bottom 140. [

The lamp 124 is stably fixed without moving in the bending portion 143 of the cover bottom 140 through the lamp holders 123a and 123b and the second bending surface 143b.

At this time, the lamp holders 123a and 123b are made of a silicone material having elasticity, and the first locking protrusions 121a formed on one side thereof are made of the same material as the lamp holders 123a and 123b and have constant elasticity. Therefore, in the process of slidingly inserting the lamp 124 into the bending portion 143, the first bending protrusion 121a is contracted to some extent by the second bending face 143b of the bending portion 143, (149a).

This is also the same as the second restricting protrusion 121b.

It is also preferable that the two side surfaces of the first and second locking protrusions 121a and 121b in the sliding insertion direction of the lamp 124 are formed in a tapered shape to facilitate the fastening thereof.

Therefore, the lamp 124 can protect the upper and lower sides and the outside of the lamp 124 through the bending portion 143 of the cover bottom 140, and at the same time, 126), it is possible to omit the lamp housing (29 of FIG. 1) which has performed such a conventional function.

Accordingly, it is possible to prevent problems caused by the conventional lamp housing (29 in FIG. 1), simplify the process and reduce the process cost.

6 is a cross-sectional view taken along line VI-VI 'of FIG.

As shown in the figure, a plurality of optical sheets 128 are interposed between the light guide plate 126 and the light guide plate 126, which are placed on the reflection plate 122 and the reflection plate 122, The first and second substrates 112 and 114 are bonded to each other with the liquid crystal layer interposed therebetween to support the liquid crystal panel 110.

A cover bottom 140 having a horizontal surface 141 is coupled to the backside of the liquid crystal panel 110 and a top cover 150 surrounding the edge of the liquid crystal panel 110 is coupled to the support main 130 and the cover bottom 140.

At this time, one edge of the cover bottom 140 has a first bending surface 143a and a first bending surface 143a which are vertically upwardly protruded with the inside facing toward the light guide plate 126, And a bending portion 143 composed of a second bending surface 143b parallel to the bending portion 143. The lamp 124 is mounted along the inner longitudinal direction of the bending portion 143. [

At this time, a reflective film 147 having high light reflection efficiency may be formed on the inner surface of the bending portion 143 of the cover bottom 140 facing the lamp 124. The reflective film 147 may be formed by coating a suitable synthetic resin or the like along the inner surface of the bending portion 143 or may have the same shape as the inner surface of the bending portion 143 And it can be completed by bringing it into contact with the inner surface of the bending portion 143.

The reflective film 147 serves to prevent the loss of light and focus the light emitted from the lamp 124 to the side of the light guide plate 126 as much as possible.

At this time, one edge of the bending portion 143 of the cover bottom 140 is exposed to the outer surface of the first bending surface 143a of the cover bottom 140, (150).

On the other hand, a backlight driving circuit 170 for applying an on / off signal to the lamp 124 is mounted on the back surface of the cover bottom 140. The lamp 124 is mounted on the back surface of the cover bottom 140, The power supply line 125 is drawn to the back surface of the LCD module so as to be connected to the backlight driver circuit 170.

That is, first and second power supply lines 125 are connected to both ends of the lamp 124. At this time, the first and second power supply lines 125 are connected to a connector (not shown) And is drawn together to one end side of the lamp 124 for connection.

Referring to FIGS. 7A and 7B, as shown in FIG. 7A, each of the first and second lamps 124 extending from both ends of the lamp 124 mounted on the bending portion 143 of the cover bottom 140, The first power supply line 125a of the two power supply lines 125a and 125b is extended so that the first power supply line 125a contacts the second bending side of the cover bottom 140 143b so that the second power supply line 125b is drawn to the one end of the lamp 124 to which the second power supply line 125b is connected.

Accordingly, the first and second power supply lines 125a and 125b of the lamp 124 are drawn to the back surface of the cover bottom 140, and the backlight driving circuit (170 of FIG. 6) mounted on the back surface of the cover bottom 140 .

At this time, the first and second power supply lines 125a and 125b can be prevented from being separated by the support main (130 in FIG. 6). To this end, any one side outer surface of the support main And the first and second power supply lines 125a and 125b of the lamp 124 are drawn out in the lateral direction of the support main (130 in FIG. 6) through the wire mounting grooves.

8A to 8B schematically illustrate the structure of the support main which can fix the first and second power supply lines of the lamp, and together with the perspective view in which the cover bottom and the lamp are combined together, would.

The lamp 124 is mounted on the bending portion 143 of the cover bottom 140 with one edge bent and the first and second power supply lines 125a and 125b Is extended and drawn out to the back surface of the cover bottom 140.

At this time, spiral wire mounting grooves 133 are formed on the side of the support main 130 to guide the first and second power supply lines 125a and 125b. The first and second power supply lines 125a and 125b are formed along the shape of the wire mounting grooves 133. The first and second power supply lines 125a and 125b may be formed in the shape of a wire, And is wound inward.

The end of the helical protrusion 135 formed by the helical wire mounting groove 133, that is, the end of the helical protrusion 135 located at the center of the wire mounting groove 133, So as to be spaced apart from the corresponding side of the engaging portion 137 at a predetermined distance.

8b, the first and second power supply lines 125a and 125b are wound along the wire mounting grooves 133 and then caught by the engaging ends 137, So that it is possible to effectively prevent the first and second power supply lines 125a and 125b from being separated from each other.

6) connected to apply an on / off signal to the lamp 124 from the backlight driving circuit 170 (FIG. 6) mounted on the back surface of the cover bottom 140, Even if a pulling force is applied to the first and second power supply lines 125a and 125b by external pressure by fixing the first and second power supply lines 125a and 125b through the wire mounting grooves 133 of the support main body 130, The force is not transmitted to the soldering portion to which the lamp 124 and the first and second power supply lines 125a and 125b are connected because the tensile force is generated at the portions wound around the mounting groove 133, .

On the back surface of the cover bottom 140 on which the lamp 124 is mounted on the bending portion 143 is formed an opening portion in which the other portion of the lamp holders 123a and 123b surrounding the electrode of the lamp 124 is exposed, (Not shown) may be formed. The other surfaces of the lamp holders 123a and 123b are opposite surfaces of one surface of the lamp holders 123a and 123b in which the first and second latching protrusions 121a and 121b are formed and the power supply lines 125a, 125b are drawn to the back surface of the cover bottom 140 through openings (not shown) and guided by the wire fixing grooves 133. [

The width of the first bending surface 143a of the bending portion 143 can be adjusted according to the outer diameter of the lamp 124 mounted on the bending portion 143 and the number of the mounted bending portion 143a.

The height of the first and second locking protrusions 121a and 121b protruding from one surface of the lamp holders 123a and 123b is set to be flush with the square main support main body 130 fastened to the cover bottom 140 If it is higher or lower, the first and second locking protrusions 121a and 121b may be damaged by physical interference.

The present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

1 is an exploded perspective view showing a general LCD module;

2 is an exploded perspective view illustrating a liquid crystal display device module according to an embodiment of the present invention.

3 is a perspective view of a cover bottom according to an embodiment of the present invention;

4 is an enlarged view of a region A in Fig. 3; Fig.

5A to 5B are views schematically showing a state in which a lamp is mounted on a bending portion of a cover bottom.

6 is a cross-sectional view taken along the line VI-VI 'of FIG. 2;

FIGS. 7A and 7B schematically show a state in which power supply lines extending from both ends of a lamp are grouped together. FIG.

8A to 8B schematically show a structure of a support main which can fix a power supply line of a lamp;

Claims (13)

A liquid crystal panel; A plurality of optical sheets interposed under the liquid crystal panel; A light guide plate provided below the plurality of optical sheets; A fluorescent lamp arranged along one longitudinal edge of the light guide plate and having a pair of lamp holders surrounding the electrode portions at both ends; The cover plate having a banding part including a second banding surface parallel to a horizontal plane on which the light guide plate is mounted and having a latching hole, Wherein the lamp holder has a first locking protrusion inserted into the locking hole, a second locking protrusion is formed at one side of the first locking protrusion, and the second locking protrusion is in contact with one side edge of the bending portion , ≪ / RTI > Wherein a distance between the first locking protrusion and the second locking protrusion is equal to a distance between the locking hole and one side edge of the second bending surface. The method according to claim 1, Wherein the cover bottom comprises a first bending face protruding upward along a lengthwise direction of the one side of the horizontal plane and a bending portion including the second bending face perpendicular to the first bending face and parallel to the horizontal plane And the liquid crystal display module. delete delete The method according to claim 1, Wherein the first and second locking protrusions are made of the same material as the lamp holder. The method according to claim 1, And a reflective film is formed on the inner surface of the bending portion. The method according to claim 6, Wherein the reflective film is one of a synthetic resin and a reflective sheet. The method according to claim 1, Wherein the liquid crystal display device module further comprises a support main body having a wire mounting groove formed on one side thereof so that a power supply line extended from the lamp is wound and mounted. 9. The method of claim 8, And the wire mounting grooves are spiral. 10. The method of claim 9, And a latching step is provided at the center of the wire mounting groove to hook the power supply line. 9. The method of claim 8, And the cover bottom has an opening through which the power supply line can be drawn. The method according to claim 1, Wherein at least two fluorescent lamps are arranged in a multi-layered structure. delete

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