KR200446935Y1 - Light source, backlight unit and display apparatus having the same - Google Patents

Abstract

A light source, a backlight unit, and a display device for improving light efficiency are disclosed. The light source includes a light emitting surface, an upper surface, a bottom surface and a side surface. The light emitting surface has a shape protruding toward the side of the light control member positioned on the side, and generates light, the top surface extends vertically from the first end of the light emitting surface, the bottom surface extends vertically from the second end of the light emitting surface Parallel to the top surface, the side faces the light emitting surface, and connects the ends of the top surface and the bottom surface to each other. Therefore, the light source can be disposed to be closer to the light adjusting member, so that the light generated from the light source can be incident on the light adjusting member without leaking to the bottom, thereby improving the efficiency of the light.

Description

LIGHT SOURCE, BACKLIGHT UNIT AND DISPLAY APPARATUS HAVING THE SAME}

The present invention relates to a light source, a backlight unit, and a display device, and more particularly, to a light source, a backlight unit, and a display device for improving light efficiency.

In general, the liquid crystal display device includes a backlight unit disposed on a rear surface of the liquid crystal display panel and generating light and providing the light to the liquid crystal display panel. However, the backlight unit not only increases the weight and volume of the liquid crystal display, but also has a high power consumption. In particular, this problem of the backlight unit is more serious in a portable liquid crystal display device which requires light weight, small size and low power consumption.

In order to overcome the above problems, recently, the liquid crystal display device employs a backlight unit including a light emitting diode (hereinafter, referred to as LED) which is a point light source. As the LEDs not only reduce power consumption, but also are suitable for implementing light and thin components, the number of backlight units employing LEDs is increasing. In particular, since the LED has a narrow irradiation distance, the LED is used in a small and medium-sized portable liquid crystal display having a small display area.

The backlight unit includes an LED for generating light, a light guide plate for guiding the light path, a mold frame for accommodating the LED and the light guide plate, and a bottom chassis for accommodating the mold frame.

Here, the LEDs generally have a rectangular shape. Accordingly, there is a problem that all of the light generated from the LED is not incident to the light guide plate, and a part of the light leaks to the bottom.

The present invention is to solve the above problems, an object of the present invention is to provide a light source having a structure for improving the light efficiency.

Another object of the present invention is to provide a backlight unit having the above-described light source.

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

The light source according to the present invention for achieving the above object includes a light emitting surface, an upper surface, a bottom surface and a side surface. The light emitting surface has a shape protruding toward the side of the light control member positioned on the side, and generates light, the upper surface extends vertically from the first end of the light emitting surface, the bottom surface is perpendicular to the second end of the light emitting surface It extends, is parallel to the top surface, the side faces the light emitting surface, and connects the ends of the top surface and the bottom surface to each other.

A backlight unit for achieving another object of the present invention includes a light adjusting member, a light source and a storage container. The light adjusting member adjusts a path of light, and the light source is disposed on the side of the light adjusting member, has a light emitting surface protruding toward the light adjusting member, and generates the light through the light emitting surface. The storage container accommodates a light adjusting member and a light source.

A display device for achieving another object of the present invention includes a display unit and a backlight unit. The display unit displays an image, and the backlight unit has a light adjusting member for adjusting a path of light for displaying the image, a light emitting surface disposed on the side of the light adjusting member, protruding toward the light adjusting member, It has a light source for generating the light through the light emitting surface, and a storage container for receiving the light adjusting member and the light source.

According to the light source, the backlight unit, and the display device, the light source may be disposed to be closer to the light adjusting member, so that the light generated by the light source does not leak to the bottom, but is incident on the light adjusting member. The efficiency of the light is improved.

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

1 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II ′ of FIG. 1.

1 and 2, a liquid crystal display according to the present invention includes a display unit 100 for displaying an image and a backlight disposed under the display unit 100 and generating light and providing the light to the display unit 100. Unit 200.

The display unit 100 is a display panel 110 for displaying the image, a main flexible printed circuit board (FPC) hereinafter coupled to the display panel 110 to receive an external signal (120). ) And a driver IC 130 generating a driving signal for driving the display panel 110 in response to the external signal. In this case, the main FPC 120 is located under the backlight unit 200 and is electrically connected to the driver IC 130 through a predetermined signal transmission film (not shown).

The display panel 110 includes an array substrate 111, a color filter substrate 112 facing the array substrate 111, and a liquid crystal layer interposed between the array substrate 111 and the color filter substrate 112. Is not made).

The array substrate 111 includes a plurality of pixels (not shown) in a matrix form. Each pixel includes a gate line (not shown) extending in a first direction, a data line (not shown) and a pixel electrode (not shown) extending in a second direction orthogonal to the first direction and intersecting the gate line. Not). Each pixel includes a TFT connected to the gate line and the data line.

The color filter substrate 112 is formed by a thin film process to express a predetermined color by using the light (not shown) and a common color formed on the RGB color pixel to face the pixel electrode. An electrode (not shown).

The liquid crystal layer is arranged in a specific direction by voltages applied to the pixel electrode and the common electrode, thereby adjusting the transmittance of light provided from the backlight unit 200.

Meanwhile, one end 111a of the array substrate 111 extends longer than one end 112a of the color filter substrate 112. Accordingly, the driver IC 130 having a chip shape is mounted on one end 111a of the array substrate 111. In addition, the signal transmission film is attached to one end 111a of the array substrate 111 to transfer the external signal from the main FPC 120 to the driver IC 130.

One surface of the main FPC 120 is provided with a first LED 310, a second LED 320, and a third LED 330 having a form of a point light source. The first to third LEDs 310, 320, and 330 generate the light in response to a light generation signal from the outside applied through the main FPC 120. Although not shown in the drawing, the main FPC 120 includes various wirings for providing the light generation signal to the first to third LEDs 310, 320, and 330.

The backlight unit 200 includes first to third LEDs 310, 320, and 330 that generate the light, and a light guide plate 400 that guides the light to the display panel 110.

Each of the first to third LEDs 310, 320, and 330 generates a minority carrier (electron or hole) injected by using a p-n junction structure of a semiconductor, and emits light by recombination thereof. Here, the number of the LED is not limited to three but may be variously changed.

The light guide plate 400 has a rectangular plate shape having a size corresponding to the display panel 110. The light guide plate 400 includes an entrance surface 410, an emission surface 420, and a reflection surface 430. Here, the incident surface 410 receives the light from the first to third LEDs 310, 320, 330 adjacent to the first to third LEDs 310, 320, 330. The emission surface 420 extends from the first end 412 of the incident surface 410 to emit the incident light. The reflective surface 430 extends from the second end 414 of the incident surface 410 to face the emission surface 420, and reflects the incident light toward the emission surface 420.

The structure of the first to third LEDs 310, 320 and 330 will be described in more detail with reference to FIG.

3 is a perspective view showing in detail the first to third LED shown in FIG.

As shown in FIG. 3, the first LED 310 has a rectangular hexagonal shape, and includes a first side 311, a second side 312, a third side 313, a fourth side 314, and a third side. It consists of five sides 315 and a sixth side 316. The first surface 311 is adjacent to the incident surface 410 of the light guide plate 400 illustrated in FIG. 1, and the light is emitted from the light, and the second surface 312 is disposed on the first surface 311. The corresponding side. In addition, the third surface 313 and the fourth surface 314 are side surfaces, the fifth surface 315 is an upper surface, and the sixth surface 316 is a bottom surface corresponding to the fifth surface 315. The sixth surface 316 is in contact with the main FPC 120.

In this case, the first surface 311 has a shape protruding toward the incident surface 410 of the light guide plate 400. That is, the first surface 311 of the first LED 310 has a shape that protrudes convexly toward the incident surface 410 of the light guide plate 400. As such, since the first surface 311 of the first LED 310 may be as close as possible to the incident surface 410 of the light guide plate 400, the light emitting surface of the first LED 310 is incident to the light guide plate 400. As the surface 410 is adjacent to the light, the light generated by the first LED 310 may be incident on the incident surface 410 of the light guide plate 400 without leaking downward.

In the above, the case where the first LED 310 has a rectangular hexagonal shape is taken as an example, but it is apparent that the first LED 310 may have various shapes.

In addition, although the first LED 310 has been described as an example, the second and third LEDs 320 and 330 also have the same configuration as the first LED 310, and thus a detailed description thereof will be omitted.

Referring back to FIGS. 1 and 2, a plurality of optical sheets 500 are disposed on the emission surface 420 of the light guide plate 400 to improve optical characteristics of light emitted from the emission surface 420.

On the other hand, the reflective plate 600 is disposed below the reflective surface 430 of the light guide plate 400. The reflection plate 600 reflects the light leaking from the reflection surface 430 toward the light guide plate 400 to improve the light efficiency of the backlight unit 200.

The liquid crystal display according to the present invention further includes a storage unit 700 for housing the backlight unit 200 and the display unit 100. The storage unit 700 includes a mold frame 710 and a bottom chassis 720.

Here, the mold frame 710 has a rectangular frame shape consisting of first to fourth sidewalls 712a, 712b, 712c, and 712d. In the mold frame 710, a first accommodating space R1 and a second accommodating space R2 are formed.

In the first storage space R1 defined by the first to fourth sidewalls 712a, 712b, 712c, and 712d, the reflective plate 600, the light guide plate 400, and the plurality of optical sheets 500 are sequentially received. do. The second storage space R2 is recessed to a predetermined depth from the first sidewall 712a. In this case, the first to third LEDs 310, 320, and 330 are accommodated in the second storage space R2.

In addition, first to fourth stepped portions 714a, 714b, 714c, and 714d are formed at upper ends of the first to fourth sidewalls 712a, 712b, 712c, and 712d, and first to fourth stepped portions 714a. The display panel 110 is mounted on the 714b, 714c, and 714d.

The bottom chassis 720 includes a bottom surface 722 and fifth to eighth sidewalls 724a, 724b, 724c, and 724d extending from the bottom surface 722 to be coupled to the mold frame 710. The mold frame 710 is seated on the bottom surface 722, and the first to fourth sidewalls 712, 712b, 712c, and 712d of the mold frame 710 are fifth to eighth sidewalls of the bottom chassis 720. 724a, 724b, 724c, 724d).

At this time, when the mold frame 710 and the bottom chassis 720 are coupled, the reflecting plate 600 and the light guide plate 400 accommodated in the mold frame 710 are supported by the bottom surface 722 of the bottom chassis 720. .

In addition, the bottom chassis 720 includes a through hole 726 formed by opening the bottom surface 722. The through hole 726 is provided at a position corresponding to the second receiving space R2 of the mold frame 710. Accordingly, the first to third LEDs 310, 320, and 330 formed on the main FPC 120 pass through the through holes 726 of the bottom chassis 720 and are received in the second storage space R2 of the mold frame 710. .

In this case, the bottom surface 722 of the bottom chassis 720 completely covers the first surfaces 311 of the first to third LEDs 310, 320, and 330 stored in the second storage space R2. That is, the first to third LEDs 310, 320, and 330 stored in the second storage space R2 of the mold frame 710 through the through hole 726 of the bottom chassis 720 have a bottom surface of the first surface 311. 722 to be fully covered.

Therefore, the first surface 311 of the first to third LEDs 310, 320, and 330 may be disposed to be closer to the incident surface 410 of the light guide plate 400. As a result, the light generated from the first to third LEDs 310, 320, and 330 is completely incident to the light guide plate 400 through the incident surface 410.

According to the exemplary embodiment of the present invention, the first to third LEDs 310, 320, and 330 have a shape in which the first surface 311 through which the light is emitted protrudes toward the incident surface 410 of the light guide plate 400. 720 is assembled to completely cover the first surface 311 of the first to third LEDs 310, 320, and 330, such that the first surface 311 of the first to third LEDs 310, 320, and 330 is an incident surface of the light guide plate 400. And may be disposed closer to 410. Accordingly, the light generated by the first to third LEDs 310, 320, and 330 does not leak to the bottom, but is incident on the light guide plate 400 through the incident surface 410, thereby improving light efficiency.

4 is a cross-sectional view illustrating a liquid crystal display according to another exemplary embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along line II-II ′ of FIG. 4. The same configuration as the embodiment of the present invention will be described with the same reference numerals.

As shown in FIG. 4, the liquid crystal display according to another exemplary embodiment of the present invention includes a display unit 100 and a backlight unit 800. At this time, the display unit 100 is the same as the embodiment of the present invention, a detailed description thereof will be omitted.

The backlight unit 800 includes first to third LEDs 910, 920, and 930 that generate light, and a light guide plate 400 that guides the light to the display panel 110. In this case, the light guide plate 400 includes an incident surface 410, an emission surface 420, and a reflective surface 430.

In addition, the first to third LEDs 910, 920, and 930 have a hexahedral shape. The first to third LEDs 910, 920 and 930 are adjacent to the incident surface 410 of the light guide plate 400, and include a light emitting surface 912 where the light is generated and a bottom surface 914 that is in contact with the main FPC 120. do.

The first to third LEDs 910, 920, and 930 include grooves 916 formed by recessing a predetermined depth in the first end portion 912a of the light emitting surface 912 of the light guide plate 400. The first end portion 912a is an end portion corresponding to the reflective surface 430 of the light guide plate 400. In this case, since the second end portion 912b corresponding to the first end portion 912a of the light emitting surface 912 is relatively protruded toward the incident surface 410 of the light guide plate 400, the first to third LEDs 910, 920, and 930 may be formed. It has a '??' shape.

Meanwhile, the reflector plate 1000 is disposed under the reflective surface 430 of the light guide plate 400. The reflector plate 1000 is formed to completely cover the light emitting surface 912 of the first to third LEDs 910, 920, and 930. That is, the reflector plate 1000 is formed to extend to the groove 916 of the first to third LEDs 910, 920, and 930. Therefore, the reflector 1000 is formed to completely cover the light emitting surfaces 912 of the first to third LEDs 910, 920, and 930, and thus a part leaked to the lower portion of the light emitted from the first to third LEDs 910, 920, and 930. Light may be completely reflected to the light guide plate 400.

The backlight assembly 800 further includes a mold frame 710 and a bottom chassis 720.

The mold frame 710 includes first to fourth sidewalls 712a, 712b, 712c, and 712d. In this case, the first and second storage spaces R1 and R2 are formed by the first to fourth sidewalls 712a, 712b, 712c, and 712d. The bottom chassis 720 also includes a bottom surface 722 and fifth to eighth sidewalls 724a, 724b, 724c, and 724d. In this case, a through hole 726 is formed in the bottom surface 722.

The first to third LEDs 910, 920 and 930 pass through the through holes 726 of the bottom chassis 720 and are received in the second storage space R2 of the mold frame 710. The first to third LEDs 910, 920, and 930 are assembled to be completely covered by the bottom surface 722 of the bottom chassis 720.

According to the backlight assembly according to another embodiment of the present invention described above, the bottom chassis 720 is assembled to completely cover the light emitting surface 912 of the first to third LEDs 910, 920, and 930. The light emitting surfaces 912 of 910, 920, and 930 may be disposed to be closer to the incident surface 410 of the light guide plate 400. In addition, the reflector plate 1000 reflects light leaked downward from the light emitting surfaces 912 of the first to third LEDs 910, 920, and 930 to enter the light guide plate 400. Therefore, the light generated by the first to third LEDs 910, 920, and 930 does not leak to the bottom, but is incident on the light guide plate 400 through the incident surface 410, thereby improving light efficiency.

As described above, the present invention includes an LED having a light emitting surface protruding toward the incident surface side of the light guide plate.

Therefore, the present invention can be disposed so that the LED is closer to the incident surface of the light guide plate, so that the light generated in the LED can be incident on the incident surface of the light guide plate without leaking downward, thereby improving the efficiency of the light. .

In addition, the present invention, since the reflecting plate is extended to cover the light emitting surface of the LED completely, the light leaking without being incident to the light guide plate can be reflected by the reflecting plate to be incident to the light guide plate to improve the efficiency of the light, thereby the display device This has the effect of improving the display quality.

Although described above with reference to embodiments, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention described in the utility model registration claims below. I can understand that.

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

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

3 is a perspective view showing in detail the first to third LED shown in FIG.

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

FIG. 5 is a cross-sectional view taken along line II-II ′ of FIG. 4.

<Description of the symbols for the main parts of the drawings>

100: display unit 200: backlight unit

310, 320, 330: first to third LED 400: light guide plate

410: incident surface 600: reflector

700: storage container 710: mold frame

720: bottom chassis

Claims (10)

In the light source for generating light by the light control member formed on the side, A light emitting surface having a shape protruding toward the light adjusting member and generating the light; An upper surface extending vertically from the first end of the light emitting surface; A bottom surface extending perpendicular from the second end of the light emitting surface and parallel to the top surface; And And a side surface facing the light emitting surface and connecting end portions of the upper surface and the bottom surface to each other. The light source of claim 1, wherein a groove recessed to a predetermined depth from the second end is formed in the light emitting surface. A light adjusting member for adjusting a path of light; A light source disposed at a side surface of the light adjusting member, the light source having a light emitting surface protruding toward the light adjusting member, and generating the light through the light emitting surface; And And a storage container accommodating the light adjusting member and the light source. The method of claim 3, wherein the light source The light emitting surface having a shape protruding toward the light adjusting member and generating the light; An upper surface extending vertically from the first end of the light emitting surface; A bottom surface extending perpendicular from the second end of the light emitting surface and parallel to the top surface; And And a side surface facing the light emitting surface and connecting one end of the upper surface and the bottom surface to each other. The backlight unit of claim 4, wherein the light emitting surface is provided with a groove recessed by a predetermined depth from the second end. The container of claim 3, wherein the storage container A mold frame formed in a frame shape by a first sidewall and having a first accommodating space accommodating the light regulating member and a second accommodating space recessed from the first sidewall to accommodate the light source; And And a bottom chassis having a bottom surface and a second side wall extending from the bottom surface, the bottom chassis being coupled to the mold frame and having a through hole penetrating through the bottom surface at a position corresponding to the second receiving space. The backlight unit of claim 3, wherein the bottom chassis is formed to completely cover a light emitting surface of the light source housed in the second accommodation space. The light emitting device of claim 4, further comprising a reflector disposed between the light adjusting member and the storage container to reflect light leaked from the light adjusting member. The reflector is a backlight unit, characterized in that extending to completely cover the light emitting surface of the light source accommodated in the second receiving space. The backlight unit of claim 4, wherein the light source is a light emitting diode. A display unit for displaying an image; And A light control member for adjusting a path of light for displaying the image, a light source disposed on a side of the light control member and protruding toward the light control member, the light source generating the light through the light emitting surface; And a backlight unit having the light adjusting member and a storage container accommodating the light source.

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