KR20040051244A - Back light assembly and liquid crystal device having the same - Google Patents

Abstract

PURPOSE: A back light assembly and an LCD(Liquid Crystal Display) including the back light assembly are provided to reduce the size of the LCD. CONSTITUTION: A back light assembly(750) includes a bottom face having a reflecting face and an incident face connected to the reflecting face, a top face opposite to the bottom face, and sides connecting the bottom face and the top face to each other. The back light assembly includes a light guide plate(720) for guiding lights, and a lamp unit(750) that is disposed under the incident face and generates lights. An LCD includes an LCD panel(210), a display unit(200) including printed circuit boards(220,230) generating driving signals for driving the LCD panel, the back light assembly, and a housing for housing the back light assembly and the LCD panel.

Description

BACK LIGHT ASSEMBLY AND LIQUID CRYSTAL DEVICE HAVING THE SAME}

The present invention relates to a backlight assembly and a liquid crystal display having the same, and more particularly, to a backlight assembly for reducing the overall size and a liquid crystal display having the same.

1 is an exploded perspective view illustrating a conventional liquid crystal display, and FIG. 2 is a cross-sectional view of the liquid crystal display shown in FIG. 1.

1 and 2, the liquid crystal display device 1000 includes a display unit 20 including a liquid crystal display panel 21 for displaying an image and a backlight for supplying uniform light to the display unit 20. Has a unit 30.

The display unit 20 includes a liquid crystal display panel 21 for displaying an image and driving circuit boards 22 and 23 for driving the liquid crystal display panel 21. The liquid crystal display panel 21 includes a TFT substrate 27 having a thin film transistor (hereinafter, referred to as TFT) (not shown) and a pixel electrode, a color filter substrate 28 having an RGB pixel and a common electrode, and a TFT substrate. And a liquid crystal (not shown) located between the 27 and the color filter substrate 28.

A plurality of gate lines (not shown) extending in the row direction and a plurality of data lines (not shown) extending in the column direction are formed in the TFT substrate 27. Here, the gate electrode of the TFT is connected to the gate line, and the source electrode of the TFT is connected to the data line. The drain electrode of the TFT is combined with the pixel electrode.

In addition, the backlight unit 30 may include a lamp 37 generating light, a light source unit 31 having a lamp cover 38 covering one side of the lamp 37, and guiding the light toward the liquid crystal display panel 21. The light guide plate 32 is provided. Here, the lamp 37 and the lamp cover 38 are provided on the side of the light guide plate 32.

Hot electrodes (not shown) for applying a high voltage and ground electrodes 39 for providing a low voltage are respectively connected to both ends of the lamp 37 accommodated in the lamp cover 38, and lamps 37 are connected to these connection portions. Lamp holder (not shown) for holding the position of the is installed.

On the other hand, the light guide plate 32 propagates the light from the lamp 37 toward the liquid crystal display panel 21 placed above the light guide plate 32.

Under the light guide plate 32, a reflecting plate 34 for reflecting the light leaking without being reflected by the dot pattern of the light guide plate 32 toward the light guide plate 32 is provided. Above the light guide plate 32, a plurality of optical sheets 33 are arranged to have a uniform brightness distribution of light emitted from the light guide plate 32 with a non-uniform brightness distribution.

The display unit 20 and the backlight unit 30 configured as described above are accommodated in the bottom chassis 12 and the mold frames 40 and 50. Specifically, the bottom chassis 12, the reflecting plate 34, the light guide plate 32, and the plurality of optical sheets 33 are sequentially stored in the mold frame 40. Thereafter, the liquid crystal display panel 21 is seated on the plurality of optical sheets 33.

The liquid crystal display 1000 may be coupled to face the mold frame 40 to include a top chassis 11 for fixing the display unit 20 and the backlight unit 30.

In a typical side light guide type backlight assembly, a lamp is provided on a side of the light guide plate, and the printed circuit board is bent and received by the bottom of the mold frame. Therefore, the bezel BB of the liquid crystal display device is widened by the minimum space required when the lamp is disposed on the side surface, and the thickness of the liquid crystal display device is increased as the printed circuit board is disposed under the lamp. As a result, an increase in the size of the liquid crystal display device cannot be prevented.

That is, in the structure of the conventional backlight assembly having a lamp on the side of the light guide plate, there is a problem that the overall size of the liquid crystal display device is increased.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to provide a backlight assembly for reducing the size.

Another object of the present invention is to provide a liquid crystal display device having the above-described backlight assembly.

1 is an exploded perspective view showing a conventional liquid crystal display device.

FIG. 2 is a cross-sectional view of the liquid crystal display shown in FIG. 1.

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

4 is a cross-sectional view taken along line II ′ of FIG. 3.

FIG. 5 is a cross-sectional view taken along line II-II ′ of FIG. 3.

FIG. 6 is a perspective view illustrating the light guide plate illustrated in FIG. 3.

FIG. 7 is an enlarged view of a bottom surface of the light guide plate of FIG. 6.

8 is a perspective view illustrating a coupling structure of the backlight assembly illustrated in FIG. 3.

9 is a perspective view illustrating a storage structure of the backlight assembly illustrated in FIG. 3.

10 is a perspective view illustrating a light guide plate according to a second exemplary embodiment of the present invention.

11 is a perspective view illustrating a light guide plate according to a third exemplary embodiment of the present invention.

12 is a cross-sectional view of a liquid crystal display according to a fourth embodiment of the present invention.

FIG. 13 is a perspective view illustrating the light guide plate illustrated in FIG. 12.

14 is a cross-sectional view of a liquid crystal display according to a fifth exemplary embodiment of the present invention.

FIG. 15 is a perspective view illustrating the light guide plate illustrated in FIG. 14.

16 is a cross-sectional view of a liquid crystal display according to a sixth embodiment of the present invention.

FIG. 17 is a perspective view illustrating the light guide plate illustrated in FIG. 16.

18 is a perspective view illustrating a light guide plate according to a seventh embodiment of the present invention.

19 is a perspective view illustrating a light guide plate according to an eighth exemplary embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

30, 700: backlight unit 37, 751: lamp

38, 755: Lamp cover 31, 750: Lamp unit

23, 230: printed circuit board 32, 720, 820, 920: light guide plate

720a, 820a, 920a: Light guide plate 33, 730: Optical sheet

34,740: reflector 60, 400: mold frame

12, 150 bottom chassis 759: electrode wire

757 groove 1000, 2000 liquid crystal display device

In order to achieve the above object of the present invention, a backlight assembly according to one side includes a bottom surface having a reflective surface and an incident surface connected to the reflective surface, an upper surface facing the bottom surface, and side surfaces connecting the bottom surface and the top surface. And a light guide plate for guiding light and a lamp unit provided below the incident surface of the bottom surface to generate the light.

According to another aspect of the present invention, a backlight assembly includes a bottom surface having a reflective surface and an incident surface extending from the reflective surface, an upper surface facing the bottom surface, and side surfaces connecting the bottom surface and the top surface, the light guide plate for guiding light and the It is provided below the incident surface of the bottom, and comprises a lamp unit for generating the light.

In addition, in order to achieve the above object of the present invention, a liquid crystal display device according to one side includes a liquid crystal display panel, a display unit including a printed circuit board for generating a driving signal for driving the liquid crystal display panel, a reflection surface and the A bottom surface having an incident surface connected to a reflective surface, an upper surface facing the bottom surface, and side surfaces connecting the bottom surface and the upper surface, a light guide plate for guiding light, and a lower side of the bottom surface of the incident surface; And a storage container for accommodating the liquid crystal display panel and the backlight assembly.

According to another aspect of an exemplary embodiment, a liquid crystal display device includes a liquid crystal display panel, a display unit including a printed circuit board generating a driving signal for driving the liquid crystal display panel, a bottom surface having a reflective surface and an incident surface extending from the reflective surface. A backlight comprising a top surface facing the bottom surface, side surfaces connecting the bottom surface and the top surface, a light guide plate for guiding light, and a lamp unit provided below the incident surface of the bottom surface to generate the light. And a housing having an assembly and a space for accommodating the liquid crystal display panel and the backlight assembly.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention.

3 is an exploded perspective view illustrating a liquid crystal display according to a first exemplary embodiment of the present invention, FIG. 4 is a cross-sectional view taken along line II ′ of FIG. 3, and FIG. 5 is a cross-sectional view taken along line II-II ′ of FIG. 3. It is a cross section.

3, 4, and 5, the liquid crystal display device 200 supplies uniform light to the display unit 200 and the display unit 200 including the liquid crystal display panel 210 for displaying an image. To have a backlight assembly 750.

The liquid crystal display 200 performs a display using a liquid crystal whose light transmittance is changed according to an electric field.

In this case, a backlight assembly for supplying light to the liquid crystal display panel is provided. The backlight assembly 750 is mounted on the lamp 751 that generates light, the lamp cover 753, the light guide plate 720 that guides the light to the display unit 200, and the light guide plate 720. Optical sheet 730 for adjusting the viewing angle of light from the light guide plate) and a reflecting plate 740 for reflecting the light leaked from the light guide plate 720 back to the light guide plate 7200.

A cold cathode tube is mainly used for the lamp 751, and the light generated from the lamp 751 is incident through the light guide plate 720. A reflection member is formed on an inner surface of the lamp cover 753, and the lamp cover 753 reflects light toward the light guide plate 720 to improve the efficiency of the light.

As shown in FIG. 4, a lamp 751 is provided below the light guide plate 720. Therefore, when the lamp 751 is disposed on the side surface of the light guide plate 720, the bezel NB is narrowed because it is not necessary to secure a necessary space.

Meanwhile, the display unit 200 includes a liquid crystal display panel 210 for displaying an image and driving circuit boards 220 and 230 for driving the liquid crystal display panel 210. The liquid crystal display panel 210 includes a TFT substrate 211 having a TFT (not shown) and a pixel electrode (not shown), a color filter substrate 213 having a RGB pixel and a common electrode, and a TFT substrate 211 and a color. Liquid crystal (not shown) positioned between the filter substrate and 213.

The display unit 200 may include a liquid crystal display panel 210, a data printed circuit board 220, a gate printed circuit board 230, a data side tape carrier package (hereinafter referred to as TCP) 240, and a gate side. TCP 250 is included. The liquid crystal display panel 210 includes a thin film transistor (hereinafter, referred to as TFT) substrate 211, a color filter substrate 213, and a liquid crystal (not shown).

The TFT substrate 211 is a transparent glass substrate on which a matrix TFT (not shown) is formed. A data line is connected to a source terminal of the TFTs, and a gate line is connected to a gate terminal. In addition, a pixel electrode made of indium tin oxide (ITO), which is a transparent conductive material, is formed in the drain terminal. When an electrical signal is input to the data line and the gate line, an electrical signal is input to the source terminal and the gate terminal of each TFT, and the TFT is turned on or turned off according to the input of these electrical signals to the drain terminal. Electrical signals necessary for pixel formation are output.

The color filter substrate 213 is provided opposite to the TFT substrate 211. The color filter substrate 213 is a substrate in which RGB pixels, which are color pixels in which a predetermined color is expressed while light passes, are formed by a thin film process. The front surface of the color filter substrate 213 is coated with a common electrode made of ITO.

When power is applied to the gate terminal and the source terminal of the transistor of the TFT substrate 211 described above and the TFT is turned on, an electric field is formed between the pixel electrode and the common electrode of the color filter substrate. By this electric field, the arrangement angle of the liquid crystal injected between the TFT substrate 211 and the color filter substrate 213 is changed, and the light transmittance is changed according to the changed arrangement angle to obtain a desired pixel.

As shown, a data side TCP 240 for determining when to apply a data driving signal is attached to a source side of the liquid crystal display panel 210, and a gate side TCP for determining a timing for applying a driving signal of a gate to the gate side. 250 is attached. The data printed circuit board 240 is connected to the data side TCP 240 to receive an image signal from the outside of the liquid crystal display panel 210 and apply a driving signal to the data line. The gate printed circuit board 230 is connected to the gate side TCP 250 to apply a driving signal to the gate line.

As shown in FIG. 4, the gate printed circuit board 230 is bent to the bottom side of the mold frame 400 by the gate side TCP, and parallel to the reflective surface 721b of the bottom 721 of the light guide plate 720. It is provided.

That is, since the gate printed circuit board 230 is disposed in a space formed by the lamp 751 disposed below the light guide plate 720, the size of the liquid crystal display device 2000 may be increased due to the arrangement of the gate printed circuit board 230. It can be prevented from increasing.

In addition, as shown in FIG. 5, the data printed circuit board 220 is bent to the side of the light guide plate 720 by the data side TCP, and is provided adjacent to the side of the light guide plate 720.

That is, the bezel NB may be prevented from being widened while being disposed toward the side of the light guide plate 720 of the data printed circuit board 220, thereby reducing the overall size of the liquid crystal display device 2000.

In FIG. 3, the liquid crystal display 2000 includes a data printed circuit board 220 and a gate printed circuit board 230 separately, but the data printed circuit board 220 and the gate printed circuit board 230 are provided. Only one integrated integrated printed circuit board (not shown) may be provided.

In FIGS. 4 and 5, the gate printed circuit board 230 is disposed on the bottom surface of the light guide plate 720, and the data printed circuit board 220 is disposed on the side surface of the light guide plate 720. Those skilled in the art will be able to modify and modify various structures.

For example, the gate printed circuit board 230 may be provided on the side surface of the light guide plate 720 or in the case of a liquid crystal display device having an integrated printed circuit board as described above, the gate printed circuit board 230 may be disposed on the bottom surface of the light guide plate 720. The case can be assumed.

On the other hand, a reflector plate 740 is provided below the light guide plate 720 to reflect the light leaked without being reflected by the printed pattern of the light guide plate 720 toward the light guide plate 720. Above the light guide plate 720, a plurality of optical sheets 730 are disposed to have a uniform brightness distribution of light emitted from the light guide plate 720 with a non-uniform brightness distribution.

The light guide plate 720, the lamp unit 750, the optical sheets 730, and the reflecting plate 740 are accommodated in the bottom chassis 150.

The bottom chassis 150 is accommodated in the mold frame 400 in a state where the light guide plate 720, the lamp unit 750, the optical sheets 730, and the reflecting plate 740 are accommodated. Thereafter, the display unit 200 is seated on the optical sheets 730, and the display unit 200 is guided by the top chassis 110 coupled to face the mold frame 400.

Specifically, the liquid crystal display panel 210 is accommodated in the mold frame 400, and a plurality of optical sheets 330 are seated thereon. A light guide plate 720 is accommodated above the plurality of optical sheets 330, and a light guide plate 720 is disposed on the light guide plate 720, and a lamp unit 750 positioned side by side with the reflective plate 740 is stored on the light guide plate 720. The bottom chassis 150 is sequentially stacked.

On the other hand, although not shown in the drawings, the rear case and the front case is coupled to accommodate the above backlight unit or the liquid crystal display module, both cases are hooked. That is, the rear case and the front case are coupled by forming a protrusion on one of the rear case and the front case and forming a groove on the other so that the protrusion is fitted into the groove.

6 is a perspective view illustrating the light guide plate illustrated in FIG. 3, and FIG. 7 is an enlarged view of a bottom surface of the light guide plate of FIG. 6.

Referring to FIG. 5, the light guide plate 720 employed in the first embodiment includes a bottom surface 721, an upper surface 726, and first, second, third, and fourth side surfaces 722, 723, 724, and 725. )

The bottom surface 721 has a reflecting surface 721b and an incident surface 721a, and the top surface 726 is a surface facing the bottom surface 721. Here, the reflective surface 721b may be assumed to be a surface in which the incident surface 721a extends.

The first side 722 extends vertically from the bottom 721, and the second side 723 faces the first side 722. The third side 724 also connects the first and second side 722, 723, and the fourth side 725 faces the third side 724.

In detail, the lamp unit 750 is disposed at the lower side of the incident surface 721a of the bottom surface 721 so that light is incident, and the reflective surface 721b of the bottom surface 721 reflects the light to the upper surface 726.

The upper surface 726 then emits light toward the liquid crystal display panel side.

In general, when the shape of the light guide plate is a polygon with corners, a light pooling phenomenon occurs where light accumulates at the corners, thereby reducing light reflection efficiency.

Therefore, in the design of the mechanism, it is common to round the corners of the light guide plate in order to prevent this phenomenon.

Meanwhile, the lamp unit 750 is disposed below the incident surface 721b of the bottom surface 721 of the light guide plate 720, and a space is formed below the reflective surface 721a of the bottom surface 721. By placing the substrate in a space, it is possible to prevent the overall size of the liquid crystal display device from growing due to the arrangement of the gate printed circuit board.

As shown in FIG. 6, the lamp unit 750 is disposed under the surface IA corresponding to the incident surface 721a and the light is incident thereon, and the surface RA corresponding to the reflective surface 721b receives the light. It serves to reflect.

8 is a perspective view illustrating a coupling structure of the backlight assembly illustrated in FIG. 3, and FIG. 9 is a perspective view illustrating an accommodation structure of the backlight assembly illustrated in FIG. 3.

8 and 9, a reflecting plate 740 and a lamp unit 753 are provided below the light guide plate 720, and a bottom chassis 150 is provided below the reflecting plate 740 and the lamp unit 750. do.

Specifically, the lamp unit 750 is provided on the incident surface 721a of the light guide plate 720 to generate light, and the reflecting plate 740 is provided on the reflective surface 721b of the light guide plate 720, and thus the light guide plate 720 is provided. The light leaked from the light is reflected toward the light guide plate 720.

In addition, a bottom chassis 150 is provided to accommodate the light guide plate 720 and the lamp unit 750. The bottom chassis 150 has a structure surrounding the light guide plate 720 and the lamp unit 750 and has a first accommodating part 150a and a second accommodating part 150b.

That is, the first accommodating part 150a surrounds the reflecting plate 740 provided in contact with the reflecting surface 721b of the light guide plate 720, and the second accommodating part 150b is disposed under both sides of the first accommodating part 150a. It is positioned to completely surround the lamp unit 750 provided on the incident surface 721c of the light guide plate 720.

On the other hand, the hot electrode (not shown) and the ground electrode 759 are drawn out to one end side of the lamp unit 750 to input external power.

Since hot electrodes are a path of high voltage, high heat is likely to be generated, and this high heat may cause malfunction of peripheral circuit elements. Therefore, a structure is generally adopted in which the ground electrode 759 is extended to the hot electrode side and connected to a connector (not shown).

In the present invention, a groove 757 for drawing out the ground electrode 759 is formed in a part of the mold frame in which the lamp cover 755 is accommodated.

In the other embodiments described later, the same structure as described above is employed.

10 is a perspective view illustrating a light guide plate according to a second exemplary embodiment of the present invention.

Referring to FIG. 10, the light guide plate 820 includes a bottom surface 821, an upper surface 826, and first, second, third, and fourth side surfaces 822, 823, 824, and 825.

The bottom face 821 is comprised from the reflecting surface 821b and the incident surface 821a. Here, the reflective surface 821b may be assumed to be a surface extending the incident surface 821a.

The top surface 826 is a surface facing the bottom surface 821, and the first, second, third and fourth side surfaces 822, 823, 824, and 825 connect the bottom surface 821 and the top surface 826.

Specifically, the first side surface 822 is inclined toward the bottom surface 821, and the second side surface 823 faces the first side surface 822.

And, the third side 824 connects the first side 822 and the second side 823, and the fourth side 825 faces the third side 824.

That is, the lamp unit 750 is disposed at the lower side of the incident surface 821a of the bottom surface 821 so that light is incident, and the reflective surface 821b of the bottom surface 821 reflects the incident light to the upper surface 826. .

In addition, the upper surface 826 emits light toward the liquid crystal display panel side. The first side 822 of the four side surfaces serves to guide light toward the reflective surface 821b of the bottom surface 821.

Here, the shape of the first side surface 822 was set to a polygonal shape inclined toward the bottom surface 821 as described above.

This is because when the lamp unit 750 is disposed below the light guide plate 820, the shape of the light guide plate 820 is deformed so that the light provided from the lamp unit 750 through the incident surface 821a of the bottom surface 821 is bottomed ( This is to perform the function of reflecting to the reflective surface 821b side of the 821 well.

As described above, even in the second embodiment, the light guide phenomenon may be prevented by rounding the edge of the light guide plate.

Although not shown in the drawings, in order to reduce the overall size of the liquid crystal display, a lamp unit is disposed under the light guide plate, and the gate printed circuit board is bent and disposed on the bottom of the mold frame in the space below the light guide plate. In addition, the data printed circuit board is bent to the side of the light guide plate so that the data printed circuit board is arranged in parallel with the side of the light guide plate.

11 is a perspective view illustrating a light guide plate according to a third embodiment.

Referring to FIG. 11, the light guide plate 920 includes a bottom surface 921, an upper surface 926, and first, second, third, and fourth side surfaces 922, 923, 924, and 925.

The bottom surface 921 has a reflecting surface 921b and an incident surface 921a, and the top surface 926 is a surface facing the bottom surface 921. Here, the reflective surface 921b may be assumed to be a surface extending the incident surface 921a.

The first, second, third, and fourth side surfaces 922, 923, 924, and 925 connect the bottom surface 921 and the top surface 926.

Specifically, the first side surface 922 has a vertical surface 922b extending vertically from the bottom surface 921 and an inclined surface 922a connected to the vertical surface 922b and inclined toward the bottom surface 921.

The second side surface 923 is opposite to the first side surface 922, and the third side surface 924 connects the first side surface 922 and the second side surface 923. The fourth side 925 also faces the third side 924.

That is, the lamp unit 750 is disposed at the lower side of the incident surface 921a of the bottom surface 921 so that light is incident, and the reflective surface 921b of the bottom surface 921 reflects the incident light to the upper surface 926. .

The upper surface 926 also emits light toward the liquid crystal display panel. The inclined surface 922a of the first side surface 922 of the four side surfaces functions to guide light toward the reflective surface 921b side of the bottom surface 921.

Here, the shape of the inclined surface of the first side surface 922 is set to a polygonal shape inclined toward the bottom surface 921 as described above.

This is to perform the function of reflecting the light provided from the lamp unit 750 through the incident surface 921a of the bottom surface 921 to the reflection surface 921b side of the bottom surface 921.

As described above, even in the third embodiment, light rounding may be prevented by rounding the edge of the light guide plate.

12 is a cross-sectional view of a liquid crystal display according to a fourth exemplary embodiment of the present invention, and FIG. 13 is a perspective view of the light guide plate shown in FIG. 12.

The LCD 200 includes a display unit 200 including a liquid crystal display panel 210 for displaying an image, and a backlight assembly 750 for supplying uniform light to the display unit 200.

The lamp 751 is provided below the light guide plate 730. Therefore, when the lamp 751 is disposed on the side of the light guide plate 730, the bezel NB is narrowed because it is not necessary to secure a necessary space.

12 and 13, the light guide plate 730 includes a bottom surface 731, an upper surface 736, and first, second, third, and fourth side surfaces 732, 733, 734, and 735.

The bottom surface 731 has a reflecting surface 731b and an incident surface 731a, and the top surface 736 is a surface facing the bottom surface 731. Here, the reflective surface 731b may be assumed to be a surface extending the incident surface 731a.

The first, second, third, and fourth side surfaces 732, 733, 734, and 735 connect the bottom surface 731 and the top surface 736.

Specifically, the incident surface 731a of the first side surface 732 is inclined toward the upper surface 736. Therefore, the shape of the portion in contact with the light guide plate 730 of the lamp unit 750 is also the same as the shape of the first side surface 732 and the lamp unit 750 is provided below the incident surface 731a.

The second side surface 733 faces the first side surface 732, and the third side surface 734 connects the first side surface 732 and the second side surface 733. In addition, the fourth side 735 faces the third side 734.

That is, the lamp unit 750 is disposed at the lower side of the incident surface 731a of the bottom surface 731 so that light is incident, and the reflective surface 731b of the bottom surface 731 reflects the incident light to the upper surface 736. .

In addition, the upper surface 736 emits light toward the liquid crystal display panel side.

As described above, even in the fourth exemplary embodiment, the rounding process may be performed at the corners of the light guide plate to prevent light pooling.

Other structures than the above are the same as those described in the first embodiment, so other descriptions will be omitted.

FIG. 14 is a cross-sectional view of a liquid crystal display according to a fifth exemplary embodiment of the present invention, and FIG. 15 is a perspective view illustrating the light guide plate of FIG. 14.

The LCD 200 includes a display unit 200 including a liquid crystal display panel 210 for displaying an image, and a backlight assembly 750 for supplying uniform light to the display unit 200.

The lamp 751 is provided below the light guide plate 730a. Therefore, when the lamp 751 is disposed on the side of the light guide plate 730a, the bezel NB is narrowed because it is not necessary to secure a necessary space.

14 and 15, the light guide plate 730a includes a bottom surface 731a, an upper surface 736a, and first, second, third, and fourth side surfaces 732a, 733a, 734a, and 735a.

The bottom surface 731a has a reflecting surface 731b 'and incident surfaces 731a' and 731a '', and the top surface 736a is a surface facing the bottom surface 731a. Here, the reflection surface 731b 'may be assumed to be a surface extending the incident surface 731a'.

The first, second, third, and fourth side surfaces 732a, 733a, 734a, and 735a connect the bottom surface 731a and the top surface 736a.

Specifically, the incident surfaces 731a 'and 731a' 'include the first incident surface 731a' extending from the reflective surface 731b and the second incident surface 731a 'extending from the first incident surface 731a'. Has') Here, the second incident surface 731a ″ is inclined toward the upper surface 736a. Therefore, the shape in contact with the light guide plate of the lamp unit 750 is also the same as the shape of the first side surface 732 and the lamp unit 750 is provided below the incident surface 731a.

The second side surface 733a faces the first side surface 732a, and the third side surface 734a connects the first side surface 732a and the second side surface 733a. In addition, the fourth side surface 735a faces the third side surface 734a.

That is, the lamp unit 750 is disposed at the lower side of the incident surfaces 731a 'and 731a' 'of the bottom surface 731a, and light is incident thereon, and the reflective surface 731b' of the bottom surface 731a is the top surface of the incident light. Reflected at 736a.

In addition, the upper surface 736a emits light toward the liquid crystal display panel side.

As described above, even in the fourth exemplary embodiment, the rounding process may be performed at the corners of the light guide plate to prevent light pooling.

Other structures than the above are the same as those described in the first embodiment, so other descriptions will be omitted.

16 is a cross-sectional view of a liquid crystal display according to a sixth embodiment of the present invention.

Referring to FIG. 16, the shape of the light guide plate 720a employed in the sixth embodiment is a wedge shape in which the thickness becomes thinner as it moves away from the lamp unit 750.

The LCD 200 includes a display unit 200 including a liquid crystal display panel 210 for displaying an image, and a backlight assembly 750 for supplying uniform light to the display unit 200.

The gate printed circuit board 230 is disposed in a space below the light guide plate generated by the lamp unit 750 disposed below the light guide plate 720a. That is, while the gate side TCP 250 is bent to the bottom of the mold frame 400, the gate printed circuit board 230 is disposed in the space on the bottom side of the mold frame 400.

Therefore, the thickness of the gate printed circuit board 230 may be prevented from being thickened, thereby reducing the overall size of the liquid crystal display device 2000.

As in the first embodiment of FIG. 5, the data-side TCP 240 is bent to the side of the light guide plate 720a and the data printed circuit board 220 is disposed to the side of the light guide plate 720a.

As a result, as the data printed circuit board 220 is disposed, the bezel NB may be prevented from widening, thereby reducing the overall size of the liquid crystal display device 2000.

On the other hand, a reflecting plate 740 is provided below the light guide plate 720a to reflect the light leaked without being reflected by the printing pattern of the light guide plate 720a toward the light guide plate 720a.

Here, the reflecting plate 740 disposed below the incident surface 721a 'of the light guide plate 720a is also disposed in parallel to the incident surface 721a' of the light guide plate 720a, so that the lamp unit 750 of the light guide plate 720a is disposed. The reflecting plate 740 is arrange | positioned in the space which arises by arrange | positioning under the side.

The light guide plate 720a, the lamp unit 750, the optical sheets 330, and the reflecting plate 740 are stored in the bottom chassis. Here, the shape of the bottom chassis 150 can also wrap the wedge shape, which is the shape of the light guide plate 720a, so as to utilize the space made by the lamp unit 750.

Other structures than the above are the same as those described in the first embodiment, so other descriptions will be omitted.

FIG. 17 is a perspective view illustrating the light guide plate illustrated in FIG. 16.

Referring to FIG. 17, the light guide plate 720a employed in the sixth embodiment includes a bottom surface 721a, an upper surface 726a, and first, second, third, and fourth side surfaces 722a, 723a, 724a, and 725a. Has

The bottom surface 721a has a reflecting surface 721b 'and an incident surface 721a', and the top surface 726a is a surface facing the bottom surface 721a. Here, the reflective surface 721b 'may be assumed to be a surface extending the incident surface 721a'.

The first side 722a extends vertically at the bottom 721a and the second side 723a faces the first side 722a. The third side 724a also connects the first and second side 722a, 723a, and the fourth side 725a faces the third side 724a.

Here, the incident surface 721a 'is parallel to the upper surface 726a, and the reflective surface 726b' has a wedge type shape that becomes thinner as the distance from the lamp unit 750 increases.

That is, the lamp unit 750 is disposed below the incident surface 721a 'of the bottom surface 721a, and light is incident thereon, and the reflective surface 721b' of the bottom surface 721a has the incident light directed to the upper surface 726a. Reflect.

The upper surface 726a is a surface which emits light toward the liquid crystal display panel side.

18 is a perspective view illustrating a light guide plate according to a seventh exemplary embodiment of the present invention.

Referring to FIG. 18, the light guide plate 820a employed in the seventh embodiment includes a bottom surface 821a, an upper surface 826a, and first, second, third, and fourth side surfaces 822a, 823a, 824a, and 825a. Has

The bottom surface 821a has a reflecting surface 821b 'and an incident surface 821a', and the top surface 826a is a surface facing the bottom surface 821a. Here, the reflective surface 821b 'may be assumed to be a surface extending the incident surface 821a'.

The first side surface 822a is inclined toward the bottom surface 821a, and the second side surface 823a faces the first side surface 822a. The third side 824a also connects the first and second sides 822a and 823a, and the fourth side 825a faces the third side 824a.

That is, the lamp unit 750 is disposed at the lower side of the incident surface 821a 'of the bottom surface 821a, and light is incident thereon, and the reflective surface 821b' of the bottom surface 821a is the incident light on the upper surface 826a. Reflect.

The upper surface 826a emits light toward the liquid crystal display panel side. The first side 822a of the four side surfaces functions to guide the light toward the reflective surface 821b 'of the bottom surface 821a.

The incident surface 821a 'is parallel to the upper surface 826a, and the reflective surface 826b' has a wedge type shape in which the thickness becomes thinner as the distance from the lamp unit 750 increases.

The reason why the first side surface 822a of the light guide plate 820a is inclined toward the bottom surface 821a is to reflect the light provided from the lamp unit 750 to the reflective surface 821b 'side of the light guide plate 820a. This is to improve the efficiency.

19 is a perspective view illustrating a light guide plate according to an eighth exemplary embodiment of the present invention.

19, the light guide plate 920a employed in the eighth embodiment includes a bottom surface 921a, an upper surface 926a, and first, second, third, and fourth side surfaces 922a, 923a, 924a, and 925a. Has

The bottom surface 921a has a reflecting surface 921b 'and an incident surface 921a', and the top surface 926a is a surface facing the bottom surface 921a. Here, the reflective surface 921b 'may be assumed to be a surface extending the incident surface 921a'.

The first side surface 922a has a vertical surface 922b 'extending perpendicular to the bottom surface 921a, a vertical surface 922b', and has an inclined surface 922a 'inclined toward the bottom surface 921a, and a second side surface. 923a faces the first side 922a. In addition, the third side 924a connects the first and second side surfaces 922a and 923a, and the fourth side 925a faces the third side 924a.

That is, the lamp unit 750 is disposed at the lower side of the incident surface 921a 'of the bottom surface 921a and light is incident thereon, and the reflective surface 921b' of the bottom surface 921a has the incident light directed to the upper surface 926a. Reflect.

The upper surface 926a emits light toward the liquid crystal display panel. The inclined surface 922a 'of the first side surface 922a of the four side surfaces functions to guide light toward the reflective surface 921b' side of the bottom surface 921a.

The incident surface 921a 'is parallel to the upper surface 926a, and the reflective surface 926b' has a wedge type shape in which the thickness becomes thinner as the distance from the lamp unit 750 increases.

Here, the reason why the inclined surface 922a 'of the light guide plate 920a is inclined toward the bottom surface 921a is that the efficiency of reflecting the light provided from the lamp unit 750 toward the reflective surface 921b' side of the light guide plate 920a. To make things better.

According to the backlight assembly and the liquid crystal display having the same, the lamp unit is disposed under the light guide plate. The printed circuit board may be bent at a side of the space or the light guide plate to which the lamp unit is disposed below the light guide plate, thereby reducing the overall size of the liquid crystal display.

In addition, in order to emit a large amount of light toward the liquid crystal display panel side, the side shape of the light guide plate may be deformed, for example, to maintain luminance uniformity.

Although described with reference to the above embodiments, those skilled in the art can understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention described in the claims below. There will be.

Claims (25)

A light guide plate formed of a bottom surface having a reflective surface and an incident surface connected to the reflective surface, an upper surface facing the bottom surface, and side surfaces connecting the bottom surface and the upper surface to guide light; And And a lamp unit provided below the incident surface of the bottom and generating the light. The method of claim 1, wherein the side surfaces, And a first side surface extending vertically from the bottom surface, a second side surface facing the first side surface, a third side surface connected between the first and second side surfaces, and a fourth side surface facing the third side surface. Characterized by a backlight assembly. 3. The backlight assembly of claim 2, wherein the incident surface is parallel to the upper surface, and the reflective surface becomes thinner as it moves away from the lamp unit. The method of claim 1, wherein the side surfaces, And a first side inclined toward the bottom side, a second side facing the first side, a third side connected between the first and second sides, and a fourth side facing the third side. Backlight assembly. The backlight assembly of claim 4, wherein the first side surface reflects light provided from the lamp unit through the incidence surface to the reflection surface side. The backlight assembly of claim 4, wherein the incident surface is parallel to the upper surface, and the reflecting surface becomes thinner as it moves away from the lamp unit. The backlight assembly of claim 6, wherein the first side surface reflects light provided from the lamp unit through the incidence surface to the reflection surface side. The method of claim 1, wherein the side surfaces, A first side surface having a vertical surface extending vertically from the bottom surface and an inclined surface connected to the vertical surface and inclined toward the bottom surface, a second side surface facing the first side surface, and a third side surface connected between the first and second side surfaces And a fourth side facing the third side. The backlight assembly of claim 8, wherein the inclined surface reflects light provided from the lamp unit through the incidence surface to the reflection surface side. The backlight assembly of claim 8, wherein the incident surface is parallel to the upper surface, and the reflective surface becomes thinner as it moves away from the lamp unit. The backlight assembly of claim 10, wherein the inclined surface reflects light provided from the lamp unit through the incidence surface to the reflection surface side. The backlight assembly of claim 1, further comprising a reflector provided below the reflecting surface of the bottom and reflecting light leaked from the light guide plate toward the light guide plate side. The backlight assembly of claim 1, further comprising a container for accommodating the lamp unit and the light guide plate. The method of claim 13, wherein the storage container, A first accommodating part surrounding the reflective surface of the bottom surface; And And a second housing part positioned below the first housing part to surround the lamp unit. A light guide plate formed of a bottom surface having a reflective surface and an incident surface extending from the reflective surface, an upper surface facing the bottom surface, and side surfaces connecting the bottom surface and the upper surface, for guiding light; And And a lamp unit provided below the incident surface of the bottom and generating the light. A bottom surface having a reflective surface and an incident surface extending from the reflective surface, an upper surface facing the bottom surface, and side surfaces connecting the bottom surface and the upper surface, the incident surface being inclined toward the upper surface side; And And a lamp unit provided below the incident surface of the bottom and generating the light. The backlight assembly of claim 16, wherein the incidence surface has a first incidence surface extending from the reflective surface and a second incidence surface extending from the first incidence surface and inclined toward the upper surface side. A display unit including a liquid crystal display panel and a printed circuit board generating a driving signal for driving the liquid crystal display panel; A bottom surface having a reflective surface and an incident surface connected to the reflective surface, an upper surface facing the bottom surface, and side surfaces connecting the bottom surface and the upper surface, a light guide plate for guiding light, and a lower side of the bottom incident surface; A backlight assembly including a lamp unit generating the light; And And a housing container for accommodating the liquid crystal display panel and the backlight assembly. 19. The liquid crystal display device according to claim 18, wherein the printed circuit board is bent and received by the bottom surface of the storage container. 20. The liquid crystal display of claim 19, wherein the printed circuit board is disposed in parallel with a reflective surface of the light guide plate. The method of claim 20, wherein the side surfaces, And a first side surface extending vertically from the bottom surface, a second side surface facing the first side surface, a third side surface connected between the first and second side surfaces, and a fourth side surface facing the third side surface. A liquid crystal display device. 21. The liquid crystal display device according to claim 20, wherein the incident surface is parallel to the upper surface, and the reflecting surface becomes thinner as it moves away from the lamp unit. 19. The liquid crystal display device according to claim 18, wherein the printed circuit board is bent to the side of the light guide plate and arranged in parallel with the side surface. A display unit including a liquid crystal display panel and a printed circuit board generating a driving signal for driving the liquid crystal display panel; A bottom surface having a reflecting surface and an incident surface extending from the reflecting surface, an upper surface facing the bottom surface, side surfaces connecting the bottom surface and the upper surface, a light guide plate for guiding light, and a lower surface of the bottom surface incident surface. A backlight assembly including a lamp unit generating the light; And And a housing container for accommodating the liquid crystal display panel and the backlight assembly. A display unit including a liquid crystal display panel and a printed circuit board generating a driving signal for driving the liquid crystal display panel; A bottom surface having a reflective surface and an incident surface extending from the reflective surface, an upper surface facing the bottom surface, and side surfaces connecting the bottom surface and the upper surface, the incident surface is a light guide plate inclined toward the upper surface side, the incident of the bottom surface A backlight assembly provided below the surface and including a lamp unit generating the light; And And a housing container for accommodating the liquid crystal display panel and the backlight assembly.