KR101252086B1 - Backlight assembly and Liquid Crystal display Module using thereof - Google Patents

Abstract

The present invention is to ensure a sufficient space for preventing the appearance of defects in the liquid crystal display module that is limited by the space and to draw out the lamp wire, and to supply power to the lamp for emitting light and both ends of the lamp And a light guide plate having a lamp wire connected to each other, and a light guide plate positioned at a side of the lamp to provide light emitted from the lamp to the front, and having stepped grooves for guiding the lamp wire to the outside and a liquid crystal display using the same. Provide a module.

Liquid Crystal Display Module, Lamp Wire, Drawout, Poor Appearance

Description

Backlight assembly and liquid crystal display module using same

1 is a sectional view showing the main parts of a conventional liquid crystal display module.

FIG. 2 is a plan view illustrating a conventional lamp wire drawing structure applied to the liquid crystal display module of FIG. 1.

3 is another embodiment illustrating a drawing structure of a lamp wire applied to a conventional liquid crystal display module.

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

5 is a cross-sectional view illustrating main parts of the liquid crystal display module of FIG. 4.

6 is a plan view illustrating a drawing structure of a lamp wire in the backlight assembly applied to the liquid crystal display module of FIG. 4.

7 is a cross-sectional view illustrating a configuration of a liquid crystal display module according to another exemplary embodiment of the present invention.

FIG. 8 is a plan view illustrating a drawing structure of a lamp wire in the backlight assembly assembly applied to the liquid crystal display module of FIG. 7.

DESCRIPTION OF THE REFERENCE NUMERALS (S)

110; liquid crystal panel 111; color filter substrate

112; thin film transistor array substrate 113, 114; polarizing plate

120; Panel Guide 130; Backlight Assembly

131; lamp 131a; lamp holder

132; lamp wire 133; reflector plate

Light guide plate 134a, 234a; step groove

135; optical sheet 135a; diffusion sheet

135b; prism sheet 135c; protective sheet

140; support main 150; bottom case

160; top case R1, R2; corner

The present invention relates to a liquid crystal display module, and more particularly, to a backlight assembly having a structure capable of securing a space for drawing a lamp wire in a narrow space in a liquid crystal display module and a liquid crystal display module using the same.

In general, a liquid crystal display (LCD), which is one of flat panel displays, has better visibility than a cathode ray tube, and has a smaller average power consumption than a cathode ray tube having the same screen size. In addition, since the heat generation amount is small, it is recently attracting attention as a next generation display device such as a mobile phone, a computer monitor, a television, etc. together with a plasma display panel and a field emission display.

Such a liquid crystal display forms liquid crystal molecules between two thin glass substrates that have been specially treated, and generates an image by changing the arrangement of liquid crystal molecules with a voltage difference between electrodes between the upper and lower glass substrates, thereby displaying an image. Since the panel itself does not emit light by itself, a separate light source is required to visually recognize the display content.

Accordingly, a module (hereinafter, referred to as a liquid crystal display module) of the liquid crystal display device includes a back light assembly as a light source on a rear surface thereof.

Hereinafter, a conventional liquid crystal display module will be described.

1 is a cross-sectional view illustrating main parts of a liquid crystal display module according to the related art, and FIG. 2 is a plan view illustrating a conventional lamp wire drawing structure applied to the liquid crystal display module of FIG. 1.

As shown in FIG. 1, a conventional liquid crystal display module includes a liquid crystal panel 10 positioned at a front surface to display an image, a guide panel 20 to seat the liquid crystal panel 10, and a light source on the liquid crystal panel 10. A backlight main assembly 30 to provide a support main body 40 in which the backlight assembly 30 and the liquid crystal panel 10 are accommodated, a bottom cover (not shown) at the rear of the support main 40, and a liquid crystal panel (10) It consists of the top cover 60 of the front surface.

Here, the backlight assembly 30 may include a lamp 31 that provides a light source, a lamp wire 32 for supplying power to the lamp 31, a reflector plate 33, a light guide plate 34, a diffusion sheet, a prism sheet, and the like. It consists of an optical sheet 35 composed of several sheets.

At this time, the lamp wire 32 is connected to both ends of the lamp 31 to be drawn out of the support main 40, as shown in Figure 2 when the lamp 31 is provided in the L shape, in general As a result, the lamp wire 32 is disposed in a space without the lamp 31.

The light guide plate 34 is located at the side of the lamp 31 to provide the light emitted from the lamp 31 to the front. In such a structure, there is a predetermined distance g between the lamp 31 and the light guide plate 34. It is ready. Furthermore, a gap G having a width equal to or greater than the diameter of the lamp wire 32 between the support main 40 and the light guide plate 34 on the side where the lamp 31 is not installed in order to pull out the lamp wire 32 to the outside. This should be prepared.

In addition, since the light guide plate 34 may have an appearance defect (or a dashed line) due to the viewer's screen viewing angle (a) that depends on the thickness and refractive index of each medium (eg, liquid crystal panel, polarizer, optical sheet, etc.), The edge portion E corresponding to must be located outside the screen viewing angle a and the reference value L calculated from the thickness and refractive index of each medium.

The reflecting plate 33 is attached to the rear surface of the light guide plate 34 by double-sided tape.

However, when the conventional liquid crystal display module configured as described above is applied to a notebook computer or a mobile phone, which is recently miniaturized, the size of the light guide plate 34 becomes smaller due to the securing of space for drawing the lamp wire 32. As a result, the edge portion E of the light guide plate 34 is positioned smaller than the reference range, resulting in a poor appearance depending on the screen viewing angle.

On the contrary, when the size of the light guide plate 34 is determined in consideration of aspects such as screen quality and appearance defects, the gap G between the light guide plate 34 and the support main 40 is reduced, thereby reducing the lamp wire 32. There is a problem that there is insufficient space to be withdrawn.

Therefore, as shown in FIG. 3, the lamp wire 70 is drawn out even in a narrow space between the light guide plate 34 and the support main 40 by using a flat type lamp wire 70. At the same time, appearance defects were prevented.

However, as the flat lamp wire 70 is used, the component material cost is much increased, and when drawing out along the curved shape, disconnection occurs, which causes another screen defect.

Accordingly, an aspect of the present invention is to provide a backlight assembly having a structure capable of preventing a defect in appearance and securing sufficient space for drawing out lamp wires in a liquid crystal display module that is limited by space. It is.

Another object of the present invention is to provide a liquid crystal display module using the above-described backlight assembly as a light source on a rear surface of a liquid crystal panel.

Technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

According to an aspect of the present invention, there is provided a backlight assembly comprising: a lamp emitting light; Lamp wires connected to supply power to both ends of the lamp; A light guide plate positioned at a side of the lamp to provide light emitted from the lamp to the front, and having a stepped groove for guiding the lamp wires and drawing them out; And a reflecting plate disposed on a side of the light guide plate on which the stepped groove is formed and a rear surface of the light guide plate, wherein the width of the stepped groove is larger than the diameter of the lamp wire.

In the backlight assembly according to the exemplary embodiment of the present invention, the stepped groove may be formed along an edge on the rear surface of the light guide plate.

At this time, the step groove is preferably formed on one side of the light guide plate.

Alternatively, the stepped groove may be formed on two side surfaces adjacent to each other in the light guide plate.

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In the backlight assembly according to the exemplary embodiment of the present invention, the stepped groove may be bent in an inner edge of a round shape.

In the backlight assembly according to an embodiment of the present invention, the lamp is preferably a fluorescent lamp.

In the backlight assembly according to an embodiment of the present invention, the lamp is preferably provided in a straight or L-shape.

In the backlight assembly according to the exemplary embodiment of the present invention, the lamp wire is preferably a round type.

On the other hand, in the backlight assembly according to another embodiment of the present invention, the stepped groove is preferably formed along the edge on the front surface of the light guide plate.

Also in this case, the stepped groove is preferably formed on one side of the light guide plate. Alternatively, the stepped groove may be formed on two side surfaces adjacent to each other in the light guide plate.

On the other hand, the liquid crystal display module according to an embodiment of the present invention for achieving the other technical problem is characterized in that configured by applying the backlight assembly of the above-described various embodiments.

Specific details of other embodiments are included in the detailed description and the drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. Like reference numerals refer to like elements throughout.

Hereinafter, various embodiments of the backlight assembly and the liquid crystal display module according to the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Work Example

4 is an exploded perspective view illustrating a configuration of a liquid crystal display module according to an exemplary embodiment of the present invention, FIG. 5 is a cross-sectional view illustrating main parts of the liquid crystal display module of FIG. 4, and FIG. 6 is a backlight assembly applied to the liquid crystal display module of FIG. 4. Is a plan view illustrating a drawing structure of a lamp wire in FIG.

First, referring to FIG. 4, a liquid crystal display module according to an exemplary embodiment of the present invention includes a liquid crystal panel 110 positioned at a front surface to display an image, a panel guide 120 for seating the liquid crystal panel 110, and a liquid crystal panel. The backlight assembly 130 installed at the rear of the 110 to provide a light source to the liquid crystal panel 110, the support main 140 having a rectangular frame shape to support the liquid crystal panel 110 and the backlight assembly 130 to be fixed, and the support. The bottom case 150 of the rear of the main 140 and the top case 160 of the front of the liquid crystal panel 110 are included.

As shown in FIG. 5, the liquid crystal panel 110 includes a color filter substrate (or upper plate) 111 having a color filter layer for implementing colors, and a thin film transistor array substrate facing the color filter substrate 111. Or lower plate) 112, a liquid crystal layer (not shown) formed between the color filter substrate 111 and the thin film transistor array substrate 112, and an outer surface of the color filter substrate 111 and the thin film transistor array substrate 112. It is composed of two polarizing plates 113 and 114 attached to each to convert natural light into polarized light.

The backlight assembly 130 includes a lamp 131 that provides a light source, two lamp holders 131a for fixing both ends of the lamp 131, and an external power source and an electrical source for supplying power to the lamp 131. Light emitted from the optical sheet 135 and the lamp 131 including various sheets such as a lamp wire 132, a diffusion sheet 135a and a prism sheet 135b, and a protective sheet 135c connected to the liquid crystal panel It includes a light guide plate 134 provided to the front of the 110, and a reflecting plate 133 disposed on the rear surface of the light guide plate 134.

At this time, the lamp 131 is a fluorescent lamp, as shown in Figures 4 and 6, is provided with an L-shaped or straight, both ends are fixed by the lamp holder 131a, respectively.

The lamp wire 132 is generally composed of a low pressure side wire 132a and a high pressure side wire 132b for supplying power to the lamp 131 and is connected to both ends of the lamp 131, respectively. Here, the lamp wire 132 may be provided in a round type, and the lamp wire 132 may be disposed in a space in which the lamp 131 does not exist at the time of withdrawal.

The light guide plate 134 is installed on the side of the lamp 131 at predetermined intervals to provide light emitted from the lamp 131 to the front of the liquid crystal panel 110, and a step groove for guiding the lamp wire 131 to the rear side. 134a is formed to draw the lamp wire 132 out of the support main 140.

In particular, the stepped groove 134a is formed in two side surfaces adjacent to each other at the rear side as shown in FIG. 6 to guide the lamp wire 132 along the edge. In addition, although not shown, the stepped groove 134a may be formed over one side or all four sides of the rear surface.

The width of the stepped groove 134a is larger than the diameter of the lamp wire 132 so that the lamp wire 132 can be inserted and guided therein, and the inner edge R1 is bent in a round shape. . This is to solve the problem that the light emitted from the lamp 131 is scattered intensively in the corner (R1) area, causing the poor linear curve, and by scattering the light efficiently scattered.

Looking at the assembly structure of the backlight assembly 130 configured as described above, the lamp 131 fixed at both ends by the lamp holder 131a is mounted in a straight or L-shape along the edge of the support main 140, the lamp ( The light guide plate 134 is positioned at the center of the support main 140 and spaced apart from the lamp 131 by a predetermined distance g1 at the center of the support main 140, and is attached to the reflective plate 133 at the rear side. The lamp wire 132 is guided to the outside of the support main 140 while the stepped groove 134a at the rear of the light guide plate 134 is guided, and the optical sheet 135 having a plurality of sheets stacked on the light guide plate 134 is provided. Is placed.

For example, when the lamp 131 is L-shaped as shown in the drawing, the stepped groove 134a of the light guide plate 134 is positioned in a direction opposite to the lamp 131 so that the lamp wire (the 132 is arranged. Accordingly, the gap g1 between the lamp 131 and the light guide plate 134 is reduced, and the gap G1 between the support main 140 and the light guide plate 134 is also reduced to the maximum while the lamp wire is formed by the stepped groove 134a. A space for withdrawing 132 can be secured.

Accordingly, the liquid crystal display module according to the exemplary embodiment of the present invention expands the light guide plate 134 by reducing the gap G1 between the support main 140 and the light guide plate 134 even in a narrow internal space, thereby improving the screen viewing angle. Prevents appearance defects and prevents black stains caused by the double-sided tape between the light guide plate 134 and the reflective plate 133. In addition, the stepped groove 134a of the light guide plate 134 may sufficiently secure a space for drawing out the lamp wire 132, as well as rounding the lamp wire 132 instead of a flat type. It can be used as a round type to reduce the manufacturing cost, and it is possible to prevent the disconnection caused by using the flat type when bending the wire.

Other Example

FIG. 7 is a cross-sectional view illustrating a configuration of a liquid crystal display module according to another exemplary embodiment. FIG. 8 is a plan view illustrating an assembly structure of a backlight assembly applied to the liquid crystal display module of FIG. 7.

As in the liquid crystal display module according to an embodiment of the present invention, the liquid crystal display module according to an embodiment of the present invention may be disposed on the liquid crystal panel 110 and the liquid crystal panel 110 to display an image. The panel guide 120, a backlight assembly 130 installed at the rear of the liquid crystal panel 110 to provide a light source to the liquid crystal panel 110, and a square frame shape to fix the liquid crystal panel 110 and the backlight assembly 130 to be fixed. The support main 140 includes a bottom case (not shown) at the rear of the support main 140, and a top case 160 at the front of the liquid crystal panel 110.

Here, in order to avoid duplicate descriptions, the same reference numerals are given to the same parts, which play the same role as the above description. Looking at the different contents, the stepped grooves 234a of the light guide plate 234 are rear surfaces as in the exemplary embodiment. Not formed on the front, and has a structure that the lamp wire 132 is guided to the step groove 234a of the front.

Specifically, the stepped grooves 234a of the light guide plate 234 are formed at two side surfaces adjacent to each other at the front surface to guide the lamp wire 132 along the edge of the front surface. In addition, although not shown, it may be formed over one side of the front side or all four sides.

The stepped groove 234a has a width larger than the diameter of the lamp wire 132, and the inner edge R2 is bent in a round shape so that the light emitted from the lamp 131 is at the corner R2. Efficient scattering prevents bright line defects caused by scattering concentration of light.

Looking at the assembly structure of the backlight assembly 130 according to another embodiment of the present invention configured as described above with reference to Figure 8, the lamp 131 is fixed to the lamp holder 131a of both ends of the support main 140 Mounted in a straight or L-shape along the corner, the light guide plate 234 is positioned at the center of the support main 140 and spaced apart from the lamp 131 by a predetermined distance (g2) at the side of the lamp 131, and the reflector plate 133 on the rear side. ) Is attached. The lamp wire 132 is guided to the outside of the support main 140 while the stepped groove 234a on the front surface of the light guide plate 234 is guided, and the optical sheet 135 having a plurality of sheets stacked on the top surface of the light guide plate 234 is provided. Is placed. The reflective plate 133 is attached to the light guide plate 234 by a double-sided tape.

For example, as illustrated, when the lamp 131 is L-shaped, the stepped groove 234a of the light guide plate 234 is positioned in a direction opposite to the lamp 131 so that the lamp wire 132 may be moved. Place in empty space. As a result, the gap g2 between the lamp 131 and the light guide plate 234 is reduced, and the gap G2 between the support main 140 and the light guide plate 234 is reduced to the maximum while the lamp is formed by the stepped groove 234a. A space in which the wire 132 can be drawn out can be secured.

Accordingly, the liquid crystal display module according to another embodiment of the present invention expands the light guide plate 234 relatively to the screen viewing angle by reducing the gap G2 between the support main 140 and the light guide plate 234 even in a narrow internal space. This prevents appearance defects and prevents black stains caused by the double-sided tape between the light guide plate 234 and the reflective plate 133.

In addition, the stepped grooves 234a of the light guide plate 234 may secure enough space for drawing the lamp wires 132, and, as a result, the lamp wires 132 may be rounded instead of flat. Can be used to reduce costs. In addition, by using the round type lamp wire 132, it is possible to prevent the disconnection caused by using the flat type when the wire is bent.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand.

Therefore, it should be understood that the above-described embodiments are provided so that those skilled in the art can fully understand the scope of the present invention. Therefore, it should be understood that the embodiments are to be considered in all respects as illustrative and not restrictive, The invention is only defined by the scope of the claims.

The backlight assembly and the liquid crystal display module using the same according to the preferred embodiment of the present invention can draw out the lamp wire by the step groove of the light guide plate even when applied to a narrow space such as a notebook computer or a mobile phone. Not only can the space be secured, but the gap between the support main and the light guide plate is made smaller to expand the light guide plate, thereby preventing appearance defects according to the viewing angle of the screen, and preventing black spot defects due to the double-sided tape between the light guide plate and the reflecting plate. There is.

In addition, the lamp wire can be used as a round type rather than a flat type, thereby reducing manufacturing costs, and preventing a defect in the wire caused by using a flat type when bending the wire. There is.

Claims (11)

Lamps that emit light; Lamp wires connected to supply power to both ends of the lamp; A light guide plate positioned at a side of the lamp to provide light emitted from the lamp to the front, and having a stepped groove for guiding the lamp wires and drawing them out; An optical sheet disposed on the front surface of the light guide plate and including a diffusion sheet, a prism sheet, and a protective sheet; And A reflection plate disposed on a side of the light guide plate on which the stepped groove is formed and a rear surface of the light guide plate; The width of the stepped groove is formed larger than the diameter of the lamp wire, The gap between the support main and the light guide plate is The front edge of the light guide plate is determined to be positioned outside the screen viewing angle and beyond a reference value calculated from a thickness and refractive index of a liquid crystal panel, a polarizer attached to the liquid crystal panel, the optical sheet, and a panel guide for mounting the liquid crystal panel. Backlight assembly, characterized in that. The method of claim 1, The step groove And a backlight assembly formed along an edge of a rear surface of the light guide plate. The method of claim 1, The step groove The backlight assembly, characterized in that formed along the edge on the front of the light guide plate. The method of claim 1, The step groove The backlight assembly, characterized in that formed on one side of the light guide plate. The method of claim 1, The step groove The backlight assembly, characterized in that formed on two sides adjacent to each other in the light guide plate. delete The method of claim 1, The step groove A backlight assembly, wherein the inner edge is bent in a round shape. The method of claim 1, And said lamp is a fluorescent lamp. The method of claim 1, The lamp assembly is characterized in that provided in the straight or L-shaped. The method of claim 1, And the lamp wire is round type. A liquid crystal display module constructed by using the backlight assembly of any one of claims 1 to 4, 5, and 7 to 10.

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