KR20110122364A - A backlight unit and a display device - Google Patents

Abstract

PURPOSE: A backlight unit and display apparatus are provided to prevent the applying situation of an electric current between a light source and a fixing cover by arranging an auxiliary reflection sheet between the light source and the fixing cover. CONSTITUTION: A light source module(13) includes light sources. A light guide plate(15) includes a light emission unit in order to guide light. A reflection sheet(17) reflects light in which is emitted by the light guide plate. An auxiliary reflection sheet(19) reflect the light to the reception light unit(15b) of the light guide plate. The auxiliary reflection sheet of a back light unit is included in the inside of a first fixing cover(21). A second fixing cover supports the back side of the light source module.

Description

A backlight unit and a display device}

The present embodiment relates to a backlight unit and a display device, and more particularly, to a backlight unit and a display device capable of minimizing light loss by allowing light emitted from a light source to be incident on the light guide plate as much as possible.

A liquid crystal display device, which is a kind of light-receiving flat panel display device used for a computer monitor, LCD-TV, mobile communication terminal, etc., does not have its own light emitting ability, and thus forms an image by selectively projecting illumination light emitted from the outside.

To this end, a backlight unit for irradiating light is installed on the inner rear surface of the liquid crystal display.

The backlight unit is classified into a direct light type and an edge light type according to an arrangement of light sources.

Here, the direct type is a form in which a light source is disposed on a light guide plate provided at the rear of the liquid crystal panel to irradiate light toward the rear of the light guide plate. Becomes

In the conventional backlight unit, since one light guide plate covers one or a plurality of light source arrays, when a quality defect occurs in a part of the light guide plate, the entire light guide plate has to be replaced.

In particular, if there are scratches, smudges or deformations on a part of the surface of the light guide plate, the brightness or darkness of light in the portion of the screen of the display device is significantly different from that of other parts. The problem to do was highlighted.

On the other hand, in the case of a display device having a large screen, the size of the light guide plate is inevitably increased in proportion to the size of the screen, and in manufacturing the backlight unit using the light guide plate having such a large size, the assembly work is cumbersome and time-consuming. There was also a problem that it takes a lot.

The present embodiment has an object to provide a backlight unit having a plurality of light emitting assemblies. Through this, the assembly and management of the light emitting assembly can be made easier.

In addition, another object of the present invention is to provide a backlight unit capable of moving light not directed toward the light guide plate so that all light emitted from the light source is incident on the light guide plate.

In addition, another object of the present invention is to provide a backlight unit capable of preventing electricity supply between a light source mounted on a light source module and a fixing cover supporting the light source.

The present embodiment for achieving the above object is a light source module including a light source; disposed adjacent to the light source module and guides the incident part and the incident light is incident light emitted from the light source is emitted in a direction different from the incident direction A light guide plate having an exit unit;

A reflection sheet disposed adjacent to the light guide plate to reflect light emitted from the light guide plate; And a light reflection assembly disposed adjacent to the incidence portion of the light guide plate and the light source module to reflect the light emitted from the light source module to the incidence portion of the light guide plate. do.

According to the present invention, since the plurality of light emitting assemblies can be assembled independently, the management of the backlight unit can be made more convenient.

In addition, since current input is made to each light emitting assembly independently, and current input can be made to the light source in each light emitting assembly independently, local image contrast control such as local dimming is enabled.

The auxiliary reflecting sheet is disposed adjacent to the light source, thereby reflecting light emitted in a different direction without facing the incident portion of the light guide plate in the direction of the light guide plate, thereby increasing the amount of light incident on the light guide plate, thereby minimizing light loss. .

In addition, since the auxiliary reflection sheet is disposed between the fixing cover and the light source, which is made of a metallic material, there is an advantage in that the electricity between the light source and the fixing cover can be prevented.

1 is an exploded perspective view of a display device having a backlight unit according to the present invention.
2 is a side cross-sectional view of a display device according to the present invention.
3 is a perspective view illustrating a plurality of light emitting assemblies of a backlight unit.
FIG. 4 is a plan view illustrating a plurality of light emitting assemblies of FIG. 3.
5 and 6 are front perspective views of the light emitting assembly according to the present invention.
7 is a rear perspective view of the light emitting assembly according to the present invention.
8 is a side cross-sectional view of a light emitting assembly according to the present invention.
9 is a perspective view of a light guide plate according to the present invention;
10 is a front perspective view of a light emitting module according to the present invention.
11 is a rear perspective view of the light emitting module according to the present invention.
12 is a perspective view of a first fixing cover according to the present invention.
13 is a rear perspective view of the first fixing cover to which the auxiliary reflection sheet according to the present invention is attached.
Figure 14 (a) to 14 (c) shows a fixing hole and the auxiliary reflection sheet provided in the first fixing cover according to the present invention.
Fig. 15 is a side sectional view showing the height relationship between the auxiliary reflection sheet and the light source according to the present invention.

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

As shown in FIG. 1, the display device of the present invention includes a backlight unit 100, an optical sheet unit 200 provided in front of the backlight unit 100 to diffuse light emitted from the backlight unit 100; And a display panel 210 provided in front of the optical sheet unit 200 to implement an image.

A support member 240 for supporting and fixing the backlight unit 100, the optical sheet unit 200, and the display panel 210 is provided, and a top cover 300 is mounted on the support member 240. do.

The backlight unit 100 includes a bottom cover 110 and a plurality of light emitting assemblies 10 mounted inside the bottom cover 110, wherein the light emitting assembly 10 is formed of the bottom cover 110. It is arranged to neighbor each other on the inner surface.

At least one beam member 250 is provided at the rear of the bottom cover 110 in the longitudinal or transverse direction, and the beam member 250 prevents thermal deformation or physical deformation of the bottom cover 110. do.

The beam member 250 may have a shape extending in one direction and may be formed of a metal material having a smaller coefficient of thermal expansion and a higher rigidity than the bottom cover 110.

Meanwhile, a power supply device (not shown) capable of supplying power to the backlight unit 100 and the display panel 210 and a substrate (not shown) are provided on the bottom of the bottom cover 110. Can be.

As shown in FIG. 2, a plurality of light emitting assemblies 10 are disposed adjacent to each other on an upper portion of the bottom cover 110 constituting the backlight unit 100.

One light emitting assembly 10 includes a light emitting module 13, a light guide plate 15 disposed adjacent to the light emitting module 13, a reflective sheet 17 disposed at a rear side of the light guide plate 15, and The light emitting module 13, the light guide plate 15, and the fixing cover 20 for fixing the reflective sheet 17 at once are configured.

The light emitting module 13 includes a light source 11 and a circuit board 12 on which the light source 11 is arranged. The light source 11 is installed to emit light toward the light guide plate 15.

A portion in which the light emitting module 13 is disposed may be defined as a light emitting area A, and a region in which light emitted by the light emitting module 13 is incident and exited from the light guide plate 15 is an emission area B. FIG. Can be defined as

The light emitting assemblies 10 are disposed to be adjacent to each other along the inner surface of the bottom cover 100, and a part of the light guide plate 15 of one light emitting assembly 10 is adjacent to another light emitting assembly 10. It is provided to cover part of the.

This is possible because the lower surface of the light guide plate 15 is formed to be inclined, and a part of the emission area B of the specific light emitting assembly 10 may cover the light emitting area B of the other light emitting assembly 10.

The bottom cover 100 is provided with a heat dissipation protrusion 110b protruding therein, and the heat dissipation protrusion 110b increases the surface area of the bottom cover 110 to increase heat dissipation efficiency.

In addition, the heat dissipation protrusion 110b is disposed between the light emitting assemblies 10 adjacent to each other, and serves to support the light emitting assembly 10.

Specifically, since the lower surface of the light guide plate 15 is inclined, a space is formed between the light guide plate 15 and the reflective sheet 17 and the bottom cover 100 due to the inclination. The heat dissipation protrusion 110b may be disposed.

The heat dissipation protrusion 110b may serve as a kind of spacer for guiding the installation positions of the light emitting assemblies 10. When the display device or the backlight unit is disposed in an upright form, the lower portion of the light emitting assembly 10 may be disposed. It can also serve as a support.

The optical sheet unit 200 disposed on the upper or front surface of the light guide plate 15 may be composed of a diffusion sheet 200a and / or a prism sheet 200b.

The diffusion sheet 200a evenly spreads the light emitted from the light guide plate 15, and the light diffused by the diffusion sheet 200a is focused onto the display panel 210 by the prism sheet 200b. Can be.

The prism sheet 200b may be configured as a horizontal or vertical prism sheet, and may be configured by using one or more roughness reinforcing films or the like.

Although not shown, guide pins for supporting the optical sheet unit 200 in the bottom cover 100 to maintain the optical sheet unit 200 without being shaken when the optical sheet unit 200 is disposed in the backlight unit. H) is preferably provided.

A predetermined hole or groove may be formed in the optical sheet part 200 to be coupled to the guide pin (not shown), and the optical pin part is coupled to the hole or groove by the guide pin (not shown). 200 may be fixed to the bottom cover 100.

The display panel 210 is provided on the front or the top of the optical sheet unit 200.

The display panel 210 includes a lower substrate 211 and an upper substrate 212 bonded to face each other to maintain a uniform cell gap, and further includes a liquid crystal layer interposed between the two substrates 211 and 222. can do.

A plurality of gate lines and a plurality of data lines crossing the same are formed on the lower substrate 211. A thin film transistor (TFT) may be formed at an intersection of the gate line and the data line.

Meanwhile, the upper substrate 212 may be provided with RGB color filters. However, the curling filter is not installed only on the upper substrate 212.

The lower substrate 211 may include a color filter in addition to the thin film transistor.

The configuration of the display panel 210 including the lower substrate 211 and the upper substrate 212 is not limited to the above-described configuration, and may be formed in various structures according to a method of driving the liquid crystal layer.

A gate driving printed circuit board (PCB) for supplying a scan signal to a gate line may be provided at an edge of the display panel 210. In addition, a polarizing film (not shown) may be disposed on at least one of an upper surface (or front surface) or a lower surface (back surface) of the display panel 210.

In addition, the edges of the display panel 210, the optical sheet unit 200, and the backlight unit 100 are enclosed and fixed by the support member 240, and the support member 240 is the top cover 300. Enclosed and fixed).

As shown in FIG. 3, the light emitting assembly 10 may be provided in plural, and each of the light emitting assemblies 10 may be arranged in a matrix form in the x-axis and y-axis directions. For example, 27 light emitting assemblies may be arranged in a 3 × 9 matrix.

As described above, the light emitting assembly 10 may be divided into a light emitting area A for emitting light and an emitting area B for emitting light, except for the lowermost light emitting assembly 10. The light emitting area A of the light emitting assembly 10 may be covered by the emission area B of the light emitting assembly below.

With this structure, the light emitting area A of the light emitting assembly 10 except for the light emitting assembly 10 at the lowermost end is not exposed to the outside.

As shown in FIG. 4, when a part of each of the light emitting assemblies 10 overlaps with each other, the light guide plates 15 of each of the light emitting assemblies 10 may be disposed to be spaced apart from each other to some extent in up, down, left, and right directions.

Here, the X direction is a direction in which the light emitting assemblies 10 are spaced apart by a predetermined distance t1 without overlapping as the left and right directions, and the y direction is a direction in which the light emitting assemblies 10 overlap with each other as a vertical direction.

The upper and lower regions of one specific light emitting assembly 10 will be referred to as L1, and the upper and lower regions of another light emitting assembly 10 overlapping a predetermined portion thereof will be defined as L2.

The light emitting assembly 10 having the upper and lower regions of L1 has an end portion 151 of the light guide plate 15 and the predetermined distance t2 from the step 152 of the light guide plate 15 of the light emitting assembly 10 having the upper and lower regions of L2. Spaced apart.

The reason for setting the predetermined distance such as t1 and t2 is that the light guide plate 15 is a resin material, which is considered to be thermal expansion due to the heat generated by the light emitting module.

This distance can prevent a particular light guide plate from being deformed or broken in contact with an adjacent light guide plate.

In particular, when the light source includes a light emitting diode (LED), and the light guide plate 15 is formed of a resin material having a large thermal expansion coefficient, the light guide plate 15 may undergo thermal expansion by heat emitted from the light emitting diode.

In this characteristic, if the light guide plates are in contact with each other before thermal expansion, the light guide plates may be pressurized with each other during the thermal expansion process, thereby causing breakage or thermal deformation of the light guide plate as a whole.

In addition, there is a risk that the arrangement between the light emitting assembly 10 including the light guide plate 15 is shifted.

However, as described above, each light guide plate 15 is spaced at a predetermined interval without being in contact with an adjacent light guide plate, thereby solving the problems of deformation and placement failure due to thermal expansion.

As described with reference to FIG. 2, in the light emitting assembly 10 of the present invention, since the light sources 11 are disposed on the lower side of the light guide plate 15, light is emitted in an edge type backlight.

Since each of the light emitting assemblies 10 is disposed adjacent to each other, and each one functions as a single light source, the light emitting assemblies 10 also have direct characteristics in this respect.

However, in this case, the light emitting assembly 10 according to the present invention may have the characteristics of the surface light source, compared to the light source in the general direct method has a characteristic of the point light source.

Therefore, the problem of the light source appearing as a hot spot on the screen can be solved, and the thickness can be reduced compared to the conventional direct type.

As shown in FIG. 5, the light emitting assembly 10 is divided into a light emitting area A and an emission area B. As shown in FIG.

In the light emitting region A, the light emitting module 13 includes a light source 11 and a circuit board 12, and a part of the light guide plate 15, and is disposed adjacent to the light source 11. And an incident part 15b through which light from the light source is incident.

In addition, the light emitting module 13 and the incidence part 15b of the light guide plate 15 are surrounded by the fixing cover 20 and coupled to each other.

The fixing cover 20 serves to cover the front and rear of the light emitting area A, the front side is surrounded by the first fixing cover 21, the rear side by the second fixing cover 22 Is surrounded.

In the case of the emission area B, an emission part B constituting a part of the light guide plate 15 and a reflection sheet 17 disposed on the rear surface of the emission part B are formed.

The output unit 15a is connected to the incident unit 15b and extends to one side.

On the other hand, a stepped section 152 is provided on the boundary between the exit section 15b and the incident section 15b. An end portion 151 is provided at the end of the exit portion 15b, and the thickness of the end portion 151 is the thinnest of the light guide plate 15.

As shown in FIG. 6, the first fixing cover 21 is provided with fixing holes 21a, 21b, and 21c into which a part of the light guide plate 15 is inserted and fixed.

As the fixing holes 21a, 21b, 21c and a part of the light guide plate 15 are coupled, the position between the light guide plate 15 and the first fixing cover 21 can be specified.

Meanwhile, predetermined insertion holes 23; 23a and 23b are provided next to the fixing holes 21a, 21b and 21c, and screwing fastening members 24; 24a and 24b are provided in the insertion holes 23a and 23b. ) Is inserted.

Here, the insertion hole 23b at the center and both ends of the insertion holes 23; 23a and 23b provided in the first fixing cover 21 is the light emitting assembly 10 by the fastening member 24b. It is provided to be fixed to the bottom cover (see Fig. 1, 110).

The small fixing holes 23a at both sides of the fixing hole 23b in the center are provided to allow the light guide plate 15 and the light emitting module 13 to be fastened by the fastening member 24a.

As shown in FIG. 7, when the rear surface of the light emitting assembly 10 is viewed, a reflective sheet 17 covering the rear surface of the light guide plate 15 is shown, and the reflective sheet 17 and the light guide plate 15 are located at the bottom thereof. ) And a second fixing cover 22 for fixing them.

Fastening holes 22a and 22b corresponding to insertion holes 23a and 23b formed in the first fixing cover 21 are formed in the second fixing cover 22.

The fastening members 24; 24a and 24b are fastened through the insertion holes 23a and 23b and the fastening holes 22a and 22b, and the ends of the relatively large fastening members 24b have a large projecting degree. The protruding portion is coupled to the bottom cover (see FIG. 1, 110).

In addition, a connector hole 47 is provided in the second fixing cover 22, and a connector 14 connected to the light emitting module 13 is inserted into the connector hole 47 so that the bottom cover (see FIG. 1). , 110).

A plurality of connector holes 47 may be provided in the second fixing cover 22. The position of the connector 14 may vary depending on which position of the bottom cover 110 is coupled to the light emitting assembly. As such, this positional change is considered.

As such, the connector 14 may be coupled to a power supply device (not shown) provided in the bottom cover 110, and power may be supplied to the light emitting module 13 by such coupling.

As shown in FIG. 8, the light emitting assembly 10 is divided into a light emitting area A and an emission area B as described above, and the light emitting area A is typically of the LED type. It is comprised by the light emitting module 13 comprised from the light source 11 and the circuit board 12. As shown in FIG.

A side surface of the incident part 15b of the light guide plate 15 is provided to face the light source 13, and when the light source 13 emits light, light moves in the C direction to enter the incident part 15b. do.

The output unit 15a is integrally connected to the incidence unit 15b, and the light entering through the incidence unit 15b passes through total reflection or diffuse reflection inside the light guide plate 15, and then, It is emitted to the outside.

At this time, the property of the light is emitted to the entire emitting portion 15a, but because of the reflective sheet 17 provided in the rear (or lower) of the light guide plate 15, the rear (or lower) of the light guide plate 15. The light directed toward is reflected by the reflective sheet 17 and reincident into the light guide plate 15, and is mainly emitted in the D direction.

The reflective sheet 17 is disposed over (or below) the light guide plate 15, a part of which is sandwiched between the circuit board 12 constituting the light emitting module 13 and the light guide plate 15. It is fixed.

The coupling relationship between the light emitting module 13, the light guide plate 15, and the reflective sheet 17 is maintained by the fixing cover 20, and the first fixing cover 21 is provided with a step. The light emitting assembly 10 is disposed in front (or upwards), and the second fixing cover 22 is disposed in the rear (or below) of the light emitting assembly 10.

The first and second fixing covers 21 and 22 and the circuit board 12 are fastened by the coupling member 24.

An auxiliary reflection sheet 19 is provided on an inner surface of the first fixing cover 21 to guide a part of the light emitted from the light source 11 toward the incident part 15b of the light guide plate 15.

Most of the light emitted from the light source 11 is directed toward the incident part 15b, but part of the light is directed toward the first fixing cover 21 while being partially emitted.

The auxiliary reflection sheet 19 is necessary to send the light emitted in the direction of the light guide plate 15.

The auxiliary reflection sheet 19 not only serves to reflect the light as described above, but also serves to prevent the conduction phenomenon in which an electrode of the light source 13 contacts the first fixing cover 21 to allow current to flow.

For this purpose, the size of the auxiliary reflecting sheet 19 is preferably formed to correspond to the size of the light source 13 or more larger, the material is preferably composed of an insulating material.

The light emitting direction of the light source 11 becomes the incident part 15b of the light guide plate 15, and accordingly, most of the light emitted from the light source 11 is directed to the incident part 15 of the light guide plate 15. .

However, due to the characteristics of light, as soon as it exits the light source 11, it spreads in all directions, so that a part of the light is directed toward the first fixing cover 21, and light loss occurs due to this phenomenon.

Therefore, in order to prevent light loss, it is important to arrange the auxiliary reflecting sheet 19 inside the first fixing cover 21 and to be located close to the light source 11.

In addition, since the reflected light must be incident on the incident part 15b of the light guide plate 15, the light is preferably disposed adjacent to the incident part of the light guide plate 15.

The second fixing cover 22 is disposed adjacent to the circuit board 12, and the heat generated from the circuit board 12 is transferred between the circuit board 12 and the second fixing cover 22. The heat dissipation member 18 for transmitting to the second fixing cover 22 is provided.

If the heat generated from the light emitting module 13 remains on the circuit board 13 causes an abnormality in the light emitting action of the light source 11, it is necessary to quickly transfer it to the outside to the heat dissipation member 18 ) Is installed.

The heat dissipation member 22 is preferably formed of a material having a high thermal conductivity, that is, a material such as metal, graphite.

In addition, the circuit board 18 preferably has a size corresponding to the left and right width and the vertical width, or is formed larger.

The light emitting plate 15a of the light guide plate 15 is formed so that its lower surface has a predetermined inclination angle θ, and the thickness thereof becomes thinner toward the end portion 151.

The end portion 151 is disposed to cover the light emitting area A of the adjacent light emitting assembly. Here, the angle of inclination may vary depending on a situation, but an optimized angle at which light incident to the incident part 15b is scattered and reflected by the bottom surface of the exit part 15a and can be emitted to the upper surface as efficiently as possible. It is preferable to become.

In addition, in order to improve light emission efficiency, a scattering pattern or a prism pattern may be formed on the surface of the light guide plate 15.

An end portion of the reflective sheet 17 disposed along the inclined surface formed on the bottom surface of the light guide plate 15 may be aligned with the end portion 152 of the light guide plate 15, or as shown in FIG. 8. It may be disposed over and in contact with the adjacent light guide plate.

Due to thermal expansion, one light guide plate 15 should be spaced apart from an adjacent light guide plate by a predetermined distance, and the reflective sheet 17 covers the separation space so that the light emitted from the light guide plate 15 may be in front of the light guide plate 15. In order to be able to reflect upwardly, it is preferable that an end portion of the reflective sheet 17 is disposed beyond the end portion 152 of the light guide plate 15.

Thus, dark lines can be prevented from appearing on the screen, and light loss can be minimized.

As such, the upper surface (or front surface) of the light guide plate 15 may form a flat surface along with the upper surface (or front surface) of the adjacent light guide plate through the arrangement between the light emitting assemblies 10. It can perform an efficient function as.

As shown in FIG. 9, a protrusion 15c is provided below the light guide plate 15. Specifically, the protrusion 15c is formed on the surface of the incident part 15b.

The protrusion 15c formed as described above is inserted into a fixing hole (see FIG. 6, 21a, 21b, and 21c) formed in the first fixing cover (see FIGS. 6 and 21), so that the light guide plate 15 is connected to the first fixing cover 21. ) To be fixed without shaking.

The shape of the protrusion 15c may be formed in various shapes (cylinder, square pillar, etc.), and is preferably disposed in a shape spaced apart from the side by a predetermined interval along the incident part 15b.

FIG. 10 illustrates the light emitting module 13, wherein the light emitting module includes a circuit board 12 that extends from side to side, and a plurality of light sources 11 spaced a predetermined distance from the surface of the circuit board 12. ).

The circuit board 12 may be provided as one of a general PCB, a metal core PCB, and a flexible PCB, but is not limited thereto.

As described above, the light source 13 is preferably composed of LEDs, and in particular, 3 to 4 may be driven independently from other units by receiving power from one unit.

As a result, by performing an operation such as local dimming, more efficient contrast may be realized when the display apparatus is operated.

In the present embodiment, the LED is composed of 32, four by one unit, eight units to configure one light emitting module 32, the number is not limited to this, various quantities are applicable Can be.

As shown in FIG. 11, the connector 14 is provided on the rear surface of the circuit board 13 so as to be connected to a power supply device provided in the bottom cover 110 (see FIG. 1).

FIG. 12 shows the first fixing cover 21. The first fixing cover 21 has a first support portion 211 that contacts the light guide plate (see FIG. 8 and 15) and supports the light guide plate 15. Referring to FIG. The second support part 212 is connected to the first support part 211 and is bent from the first support part 211 to be stepped.

Fixing holes 21a, 21b, and 21c are formed between the first support part 211 and the second support part 212 at predetermined intervals, and the light guide plate 15 is disposed in the fixing holes 21a, 21b, and 21c. Protrusions (see Fig. 9, 15c) provided in is inserted and fixed.

As shown in FIG. 13, the auxiliary reflection sheet 19 is attached to an inner surface of the first fixing cover 21, and the auxiliary reflection sheet 19 is divided into the fixing holes 21a, 21b, and 21c. ) Is disposed between the end portions of the fixing hole (21c) and the first fixing cover (21).

The light source 11 (see FIG. 8) is disposed adjacent to the first fixing cover 21, and its installation height is similar to that of the fixing holes 21a, 21b, and 21c.

This is a projection (see Fig. 9, 15c) of the light guide plate (see Fig. 9, 15) is disposed on the inner upper surface of the fixing holes (21a, 21b, 21c), the light source module immediately below the light guide plate 15 This is because the light sources (see Figs. 10 and 11) are arranged to the left and right of the fixing holes 21a, 21b and 21c.

For this reason, the auxiliary reflection sheet 19 may be disposed over the left and right surfaces of the fixing holes 21a, 21b, and 21c, and may be divided and attached to each other.

Since the light source 11 is not installed where the auxiliary reflecting sheet 19 is not installed even when divided and attached in this way, no light loss occurs there.

Referring to FIG. 14A, the first fixing hole 21a may include an end portion 124 contacting one side surface of the protrusion (see FIG. 9 and 15c) of the light guide plate (see FIG. 9 and 15). .

Referring to FIG. 14B, the second fixing hole 21b may include an insertion part 125 corresponding to the protrusion part 15c of FIG. 9.

Referring to FIG. 14C, the third fixing hole 21c may have a width larger than that of the protrusion part 15c.

Not forming all of the fixing holes 21a, 21b, and 21c so as to correspond precisely to the protrusions (see FIG. 9 and 15c) is to secure a free space in consideration of thermal expansion of the light guide plate 15 to secure the optical assembly 10. ) To ensure reliability.

In the embodiment, only the second fixing hole 21b is formed to correspond exactly to the protrusion part 15c, and the remaining holes 21a and 21c have a free space to consider thermal expansion of the light guide plate 15. .

Meanwhile, the first side cover 21, the second side cover 22, and the light emitting module unit 13 may be coupled to a region adjacent to the plurality of holes 21a, 21b, and 21c by screws 51 or the like. Insertion holes 23a, 23b and 24b may be formed to be engaged by the member. However, the position of the insertion holes 23a, 23b, and 23c is not limited.

As described above, the auxiliary reflection sheet 19 is preferably disposed on the left and right sides of the fixing holes 21a, 21b, and 21c, and the fastening members are coupled to the fixing holes 21a, 21b, and 21c. For this reason, it is preferable that the auxiliary reflecting sheet 19 is not disposed.

As shown in FIG. 15, when the light emitting assembly 10 is upright and mounted to the bottom cover (see FIG. 1 and 110), the first fixing cover 21 has an inner surface of the light guide plate 15. It is provided to be interviewed on the front surface of the incident portion 15b, and the auxiliary reflection sheet 19 is disposed below the interviewed portion.

In this case, the auxiliary reflecting sheet 19 is disposed in front of the light source 11 and at the bottom of the incident part 15b of the light guide plate 15.

As a result, some of the light emitted from the light source 11 toward the auxiliary reflecting sheet 19 is reflected by the auxiliary reflecting sheet 19 and moved upward, and thus the incident part 15b of the light guide plate 15 is moved. Incident

On the other hand, the height h1 of the auxiliary reflection sheet 15 is preferably formed the same or larger than the height h2 of the light source (11).

This is to increase the reflection area so that the light from the light source 11 toward the auxiliary reflecting sheet 19 can be reflected to the incident part 15b of the light guide plate 15.

In addition, when the auxiliary reflecting sheet 19 is provided between the first fixing cover 21 and the light source 11 in consideration of the purpose of preventing the electrical current due to contact, the height of the reflective sheet 19 is It is preferable to be equal to or larger than the height of the light source 11.

10: light emitting assembly 11: light source
12: circuit board 13: light emitting module
15: Light guide plate 15a: exit section
15b: incident part 17: reflective sheet
18: heat sink 19: auxiliary reflective sheet
20: fixing cover 21: first fixing cover
22: second fixing cover

Claims (14)

A light source module including a light source;
A light guide plate disposed adjacent to the light source module, the light guide plate including an incident part to which light emitted from the light source is incident, and an exit part to guide the incident light in a direction different from the incident direction;
A reflection sheet disposed adjacent to the light guide plate to reflect light emitted from the light guide plate;
And a sub-reflective sheet disposed adjacent to the incidence portion of the light guide plate and the light source module to reflect the light emitted from the light source module to the incidence portion of the light guide plate. The method of claim 1,
And a fixing cover for supporting the light source module, the light guide plate, and the reflective sheet to be fixed to each other.
The fixing cover may include a first fixing cover which supports the front of the light source module and the front of the incident part of the light guide plate;
A second fixing cover for supporting the rear of the light source module,
The auxiliary reflection sheet is a backlight unit, characterized in that provided on the inner surface of the first fixing cover. The method of claim 2,
The auxiliary reflection sheet is a backlight unit, characterized in that disposed along the left and right directions of the inner surface of the first fixing cover. The method of claim 3,
The first fixing cover may include a first support part which is in contact with an incident part of the light guide plate; A second support part connected to the second support part and bent from the first support part to be stepped,
The auxiliary reflection sheet is a backlight unit, characterized in that disposed on the inner surface of the first support. The method of claim 3,
The left and right width of the auxiliary reflecting sheet is a backlight unit, characterized in that it is formed corresponding to or larger than the left and right width of the light source is arranged in the light source module. The method of claim 2,
The height of the auxiliary reflecting sheet is a backlight unit, characterized in that corresponding to or larger than the height of the light source facing the auxiliary reflecting sheet. The method of claim 6,
And the auxiliary reflecting sheet is disposed adjacent to the incidence portion of the light guide plate so that the reflected light can be directed to the incidence portion of the light guide plate. The method of claim 2,
The first fixing cover may include a fixing hole into which a protrusion formed at a lower portion of the front surface of the light guide plate is inserted.
And the reflective sheet is disposed between the fixing hole and the fixing hole and between the side ends of the fixing hole and the first fixing cover. The method of claim 1,
The auxiliary reflection sheet is a backlight unit, characterized in that composed of an insulating material to prevent the electricity between the fixing cover and the electrode of the light source. The method of claim 1,
The reflective sheet is disposed at the rear of the light guide plate to reflect the light emitted from the rear of the light guide plate in the front direction of the light guide plate,
The auxiliary reflection sheet is a backlight unit, characterized in that disposed in the lower portion of the incident portion of the light guide plate to reflect the light emitted from the light source does not enter the light guide plate to the light guide plate. A light source module including a light source;
A light guide plate disposed adjacent to the light source module, the light guide plate including an incident part to which light emitted from the light source is incident, and an exit part to guide the incident light in a direction different from the incident direction;
A reflection sheet disposed adjacent to the light guide plate to reflect light emitted from the light guide plate;
A fixing cover coupled to the light source module, the light guide plate, and the reflective sheet to fix the light source module, the light guide plate, and the reflective sheet;
And a light emitting assembly disposed between the fixing cover and the light source to prevent contact between the light source and the fixing cover and including an auxiliary reflection sheet reflecting light of the light source to the light guide plate. The method of claim 11,
The fixing cover and the first fixing cover disposed in front of the light source module;
Including a second fixing cover disposed behind the light source module,
The auxiliary reflection sheet is disposed on the inner surface of the first fixing cover to face the light source provided in the light source module. The method of claim 12,
The inner surface of the first fixing cover is in contact with the front of the incident portion of the light guide plate,
The auxiliary reflection sheet is disposed below the portion in contact with the front of the incident portion of the light guide plate. The method of claim 12,
The auxiliary reflection sheet is disposed in front of the light source, characterized in that disposed below the incident portion of the light guide plate.

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