KR20150030115A - Back light unit and liquid crystal display device using the same - Google Patents

Abstract

The present invention relates to a back light unit and a liquid crystal display device using the same. The back light unit can improve the durability of the back light unit by changing the assembly structure of a large back light unit and further improves reliability by reducing the luminescence deviation of the back light unit. It includes light source fixing parts which have light sources and are arranged in the side of a bottom cover; and a light guide plate which is received in the bottom cover and receives light from each light source to a light entering surface and emits the light to a front side. A first assembly fixing part consisting of fixing holes and protrusion parts is respectively formed in the center part of both sides of the bottom cover. A second assembly fixing part consisting of fixing holes and protrusion parts corresponding to the first assembly fixing part is formed in the center part of both sides of the light guide part. The first and the second assembly fixing part are respectively assembled and fixed to a fixing clip part formed in the center part of both sides of a panel guide.

Description

BACK LIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE USING THE SAME [0002]

The present invention relates to a backlight unit for improving durability of a backlight unit by reducing the assembling structure of a backlight unit which is enlarged and reducing the deviation of light emission luminance of the backlight unit, And a display device.

BACKGROUND ART Demands for video display devices have been increasing in various forms as an information society has developed. In recent years, a liquid crystal display, a field emission display, a plasma display panel, Various flat panel display devices such as an organic light emitting diode display are utilized.

Of the flat panel display devices, liquid crystal display devices are widely used because they can operate at low power and have excellent image quality. In a liquid crystal display device, a liquid crystal panel composed of two substrates facing each other and liquid crystal interposed therebetween is used. Such a liquid crystal panel corresponds to a non-light emitting type liquid crystal panel, and receives light from a backlight unit to display an image. Generally, the backlight unit is divided into an edge type backlight unit and a direct-type backlight unit depending on the position of the light source.

BACKGROUND ART [0002] In recent years, a backlight unit using a light emitting diode as a light source which is advantageous in power consumption, weight, and brightness of a backlight unit is mainly used. In particular, an edge-type backlight unit that allows a light-emitting diode to supply light from a side surface of a backlight unit has been mainly developed and used to realize a lightweight, thin, high-brightness backlight unit.

However, in the case of a liquid crystal display device requiring a large screen, there are many restrictions to apply an edge type backlight unit using a light emitting diode. Particularly, since the liquid crystal display device mainly has a rectangular shape, when the light emitting diodes are disposed on one side and the other side of the short side, the light emission luminance is lowered and when the light emitting diodes are disposed on one side and the other side of the long side, The thickness variation had to be considered.

If the size and thickness of the light guide plate due to heat generation and the changes in the shape and the shape of the light guide plate are not properly taken into account, variations in the distance between the light emitting diode and the light guide plate are uneven when the light guide plate expands or contracts, And the light guide plate fixing structure may be damaged, and the reliability of the product may be reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and it is an object of the present invention to improve the durability of the backlight unit by reducing the assembly brightness of the backlight unit, And a liquid crystal display device using the same.

According to an aspect of the present invention, there is provided a backlight unit including: a plurality of light source fixing parts, each having a plurality of light sources; And a light guide plate housed in the bottom cover and receiving light from the respective light sources to the side incidence surface to emit the light toward the front surface. The bottom cover has a plurality of fixing holes and a plurality of And a second assembly fixing portion formed of a plurality of fixing holes and a plurality of protrusions are formed in the central portions of both side surfaces of the light guide plate, And the second assembly fixing portion is assembled and fixed to the fixing clip portion formed at the center portion of both sides of the panel guide.

Wherein the plurality of light source fixing parts are fixedly arranged along the longitudinal direction of both sides of the light guide plate so that light of each light source is irradiated in such a manner that the light guide plate faces both long sides of the light guide plate, And each of the assembly fixing part and the fixing clip part is configured to correspond to a center part of both ends of the bottom cover, the light guide plate and the panel guide.

Wherein the first assembly fixing portion of the bottom cover includes a plurality of first fixing holes and a plurality of first protrusions in a region of the four sidewall faces formed in the shape of a square frame, The plurality of first protrusions extend from the bottom surface of the bottom cover to the same thickness as the bottom surface, and the first fixing holes are formed on both sides of the first protrusions.

Wherein the second assembly fixing portion of the light guide plate includes a plurality of second fixing holes and a plurality of second protrusions at center portions of both side surfaces of the light guide plate so as to correspond to the first assembly fixing portion formation region of the bottom cover, The second projecting portion is configured to have the same thickness as that of the light guide plate so as to protrude from the side surface of the light guide plate so as to be disposed on the entire surface of the plurality of first projections corresponding to the plurality of first projections, And the second fixing holes are formed to correspond to the first fixing holes of the bottom cover.

Wherein the fixing clip portion of the panel guide includes a clip wall surface configured to cover the cut-out region of the bottom cover and the second protrusions of the light guide plate so as to be disposed on the side surface of the bottom cover, And a plurality of third protrusions configured to be inserted into the plurality of first fixing holes and the plurality of second fixing holes, respectively.

According to another aspect of the present invention, there is provided a liquid crystal display device including: a liquid crystal panel having a plurality of pixel regions to display an image; A panel guide for seating and fixing the liquid crystal panel; And a backlight unit which is assembled so as to be positioned on a back surface of the liquid crystal panel and the panel guide and irradiates light to the liquid crystal panel, wherein the backlight unit includes a plurality of light sources, Light source fixture; And a light guide plate housed in the bottom cover and receiving light from the respective light sources to the side incidence surface to emit the light toward the front surface. The bottom cover has a plurality of fixing holes and a plurality of And a second assembly fixing portion formed of a plurality of fixing holes and a plurality of protrusions are formed in the central portions of both side surfaces of the light guide plate, And the second assembly fixing part is assembled and fixed to the fixing clip part formed at the center part of both side surfaces of the panel guide.

Wherein the plurality of light source fixing parts are fixedly arranged along the longitudinal direction of both sides of the light guide plate so that light of each light source is irradiated in such a manner that the light guide plate faces both long sides of the light guide plate, And each of the assembly fixing part and the fixing clip part is configured to correspond to a center part of both ends of the bottom cover, the light guide plate and the panel guide.

Wherein the first assembly fixing portion of the bottom cover includes a plurality of first fixing holes and a plurality of first protrusions in a region of the four sidewall faces formed in the shape of a square frame, The plurality of first protrusions extend from the bottom surface of the bottom cover to the same thickness as the bottom surface, and the first fixing holes are formed on both sides of the first protrusions.

Wherein the second assembly fixing portion of the light guide plate includes a plurality of second fixing holes and a plurality of second protrusions at center portions of both side surfaces of the light guide plate so as to correspond to the first assembly fixing portion formation region of the bottom cover, The second projecting portion is configured to have the same thickness as that of the light guide plate so as to protrude from the side surface of the light guide plate so as to be disposed on the entire surface of the plurality of first projections corresponding to the plurality of first projections, And the second fixing holes are formed to correspond to the first fixing holes of the bottom cover.

Wherein the fixing clip portion of the panel guide includes a clip wall surface configured to cover the cut-out region of the bottom cover and the second projections of the light guide plate so as to be disposed on the side surface of the bottom cover, And a plurality of third protrusions configured to be inserted into the plurality of first fixing holes and the plurality of second fixing holes, respectively.

The backlight unit according to an embodiment of the present invention having the above characteristics and the liquid crystal display using the backlight unit according to the present invention can improve the durability of the backlight unit by changing the assembly structure of the backlight unit, The reliability can be further improved.

1 is an exploded perspective view schematically showing a liquid crystal display device provided with a backlight unit according to an embodiment of the present invention.
FIG. 2 is a perspective view specifically showing a backlight assembly fixing section which is a region B in FIG. 1; FIG.
Figs. 3A to 3C are perspective views respectively showing the first assembly fixing portion of the bottom cover, the second assembly fixing portion of the light guide plate and the fixing clip portion structure of the panel guide shown in Figs. 1 and 2, respectively.
FIG. 4 is a perspective view illustrating an assembled state in which the first and second assembly fixing portions and the fixing clip portions shown in FIGS.

Hereinafter, a backlight unit according to an embodiment of the present invention and a liquid crystal display using the same will be described in detail with reference to the accompanying drawings.

1 is an exploded perspective view schematically showing a liquid crystal display device provided with a backlight unit according to an embodiment of the present invention. 2 is a perspective view specifically showing a back light assembly fixing section which is a region B in Fig.

The liquid crystal display of FIG. 1 includes a panel guide 6 assembled with a backlight unit; A liquid crystal panel 10, and a top case and a bezel 20.

The liquid crystal panel 10 is stacked on the panel support portion of the panel guide 6 to adjust the transmittance of light from the backlight unit to display an image. The liquid crystal panel 10 includes a lower substrate 10b and an upper substrate 10a, a liquid crystal layer (not shown) for adjusting the light transmittance between the lower and upper substrates 10a and 10b, And a spacer (not shown) that maintains a constant distance between the upper substrate 10a and the upper substrate 10a.

On the upper substrate 10a, blue, red, and green color filters may be formed, or a transparent resin, red and green phosphors may be formed, and a black matrix, a common electrode, and the like may be further provided.

The lower substrate 10b includes a thin film transistor formed in each cell region defined by data lines and gate lines, and a pixel electrode connected to the thin film transistor. The thin film transistor supplies an image signal supplied from the data line to the pixel electrode in response to a gate-on voltage supplied from the gate line. Here, the common electrode formed on the upper substrate 10a may be formed on the lower substrate 10b according to the mode of the liquid crystal. A liquid crystal layer is formed in each of the cell regions to control the light transmittance.

On the other hand, a plurality of data circuit films (not shown) mounted with a data integration circuit for supplying image signals to the data lines are attached to at least one of the non-display regions of the lower substrate 10b. On one of the non-display areas of the lower substrate 10b, a plurality of gate circuit films are mounted, on which gate integrated circuits for supplying gate-on voltages to the gate lines are mounted. The gate integrated circuit may be mounted on the lower substrate 10b by a chip on glass method or may be formed on the lower substrate 10b together with the manufacturing process of the thin film transistor.

The panel guide 6 is provided on the front seat portion of the bottom cover 2 so as to cover the front surface of the light source fixing portion 3 of the backlight unit and the front edge of the light guide plate 5 or at least one of the optical sheets Respectively. The panel guide 6 is provided with a panel supporting portion for supporting the liquid crystal panel 10. The panel supporting portion is formed so as to support the rear surface non-display region and the side surface of the liquid crystal panel 10. In the central portions of both side surfaces of the panel guide 6, a fixing clip portion 6a to be assembled and fixed to the backlight unit is formed. The bottom cover 2 and the light guide plate 5 constitute a backlight unit. And is fastened and fixed to the provided assembly fixing portion. The assembly structure of the panel guide 6, the bottom cover 2 and the light guide plate 5 will be described in detail with reference to the accompanying drawings hereinafter.

The top case or the bezel 20, particularly the bezel 20, is formed to cover the front non-display area of the liquid crystal panel 10. [ In the case of the top case, it may be bent so as to cover the front non-display area of the liquid crystal panel 10 and the side surface of the bottom cover 2. [ At this time, the top case can be fastened to the bottom cover 2 in the form of housing the panel guide 6 and fixed.

The backlight unit includes a light source fixing part (3) having a plurality of light sources (4) attached thereto and disposed on an inner side surface of the bottom cover (2); A light guide plate (5) housed in the bottom cover (2) to receive light from each light source (4) to the side incidence surface and emit the light traveling direction to the front; A plurality of optical sheets (not shown) laminated on the front surface of the backlight unit 5, that is, the front surface of the light guide plate 5, for outputting light from the light guide plate 5 to the front surface; And a light shielding tape (not shown) attached to the front surface of the front surface of the optical sheet disposed on the frontmost surface of the plurality of optical sheets and the front surface of the light source fixing portion 3 to fix the plurality of optical sheets and the light source fixing portion 3, Respectively.

As shown in FIG. 1 and the 'A' and 'B' regions in FIG. 1, a first assembly fixing portion composed of a plurality of fixing holes and a plurality of protrusions is formed at the central portions of both sides of the bottom cover 2. The light guide plate 5 is also provided with a second assembly fixing portion corresponding to the first assembly fixing portion and including a plurality of fixing holes and a plurality of protrusions. The first and second assembling and fixing portions are respectively assembled and fixed to the fixing clip portion 6a formed at the central portions of both side surfaces of the panel guide 6. [

Each of the plurality of light sources (4) is detachably mounted on at least one light source fixing part (3) and positioned to face the side light incidence surface of the light guide plate (5). Here, the plurality of light sources 4 may be monochromatic LEDs, for example, white or blue LEDs or ultraviolet (UV) LEDs may be used as the light source. The plurality of light sources 4 are illuminated by the light source driving power supplied through the light source fixing part 3 and irradiate light to the light incidence surface of the light guide plate 5. [

Each light source fixing part 3 is fixed to the back surface thereof with the light shielding tape 2 while the light sources 4 are attached and fixed. The light source fixing part 3 may be arranged such that the light of the light sources 4 is irradiated to either side of the light guide plate 5. The light source fixing part 3 improves the light efficiency of the light guide plate 5 Or the like, so that they can be arranged in a plurality. 1, each of the light source fixing parts 3 is provided with the light source 4 facing the mutually facing long sides of the light guide plate 5, Direction along the longitudinal direction of the light guide plate 5 so as to irradiate the light.

Each of the light sources 4 irradiates light to the long-side incident light surface of the light guide plate 5 disposed on the front surface thereof. The light source fixing portion 3 partially covers the direction in which the light is irradiated along the direction in which the light is irradiated. The light guide plate 5 may be formed so as to partially cover the light guide plate 5 in the direction perpendicular to the long-side light incident surface. The light source fixing part 3 is formed of a flexible printed circuit (FPC) substrate or an FPC film, and supplies light source driving power from the outside to each light source 4.

When the light source fixing parts 3 are arranged to irradiate light in the form of facing the light sources 4 along the longitudinal direction of both sides of the light guide plate 5, the light efficiency can be improved, but the light guide plate 5, The expansion and shrinkage deformation of the tube.

The bottom cover 2 has a lower surface opposed to the liquid crystal panel 10 and four side walls formed in a square frame shape so that the light sources 4 can be arranged and accommodated and fixed to the light guide plate 5, (Shown in the "A" and "B" regions in Fig. 1) consisting of a plurality of fixing holes and a plurality of protrusions in the region where the center portions of both side walls facing each other are cut.

(Not shown) for reflecting the light from each light source 4 toward the liquid crystal panel 10, that is, the front side thereof, is further formed on the lower bottom surface and the inner side surface of the bottom cover 2. [ As described above, the bottom cover 2 is formed in a rectangular frame shape, and a light source fixing groove in which the light sources 4 are inserted and arranged is formed on the inner side surface thereof.

In other words, when the light source fixing parts 3 are arranged so as to irradiate light in the form of facing the light sources 4 along both longitudinal directions of the light guide plate 5, the light source fixing parts 3 are arranged A light source fixing groove in which the light sources 4 are inserted and arranged is formed on both side wall surfaces. Each of the side wall surfaces corresponding to both ends of the light guide plate 5 is cut off at its central portion without the respective light source fixing portions 3 being disposed therebetween to form a first assembly fixing portion (not shown) having a plurality of fixing holes and a plurality of protruding portions (Shown in the 'A' and 'B' regions of FIG. 1) are formed.

The light guide plate 5 is stacked on the front opening of the bottom cover 2 having a rectangular frame shape, that is, the inner bottom surface. The light guide plate 5 converts the path of the light irradiated to the side light incident surface to diffuse the light to the entire area of the liquid crystal panel 10.

As shown in Fig. 2, at the centers of both side surfaces of the light guide plate 5, that is, at the center of both side surfaces corresponding to the first assembly fixing portion of the bottom cover 2, And can be assembled and fixed to the fixing clip portion 6a formed at the center portions of both side surfaces of the panel guide 6. [

On the other hand, a plurality of optical sheets, not shown in the drawings, allow the light from the light guide plate 5 to be emitted to the front surface thereof, while allowing the light efficiency to be emitted to be further improved. It is most efficient that the plurality of optical sheets are arranged so as to cover the entire surface of the light guide plate 5 except for the light source fixing portion 3. [ In addition, the backlight unit further includes a light source driving circuit unit (not shown) that generates a light source driving power source and drives the respective light sources 4, and controls the light source driving power source .

FIGS. 3A to 3C are perspective views respectively showing the first assembly fixing portion of the bottom cover, the second assembly fixing portion of the light guide plate, and the fixing clip portion structure of the panel guide shown in FIGS. 1 and 2, respectively.

The first assembly fixing portion of the bottom cover 2 shown in FIG. 3A includes a plurality of first fixing holes 2b in the region 2b where the central portions of both side wall surfaces 2a facing each other among the four side wall surfaces formed in the shape of a square frame, (2d) and a plurality of first projections (2c). Here, the plurality of first projections 2c extend from the bottom surface of the bottom cover 2 to have the same thickness as the bottom surface, and on both sides of each of the first projections 2c, 2d are formed.

The second assembly fixing portion of the light guide plate 5 shown in FIG. 3B includes a plurality of second fixing holes 5c at the center portions of both sides of the light guide plate 5 so as to correspond to the first assembly fixing portion formation region of the bottom cover 2 And a plurality of second projections 5b. The plurality of second protrusions 5b may protrude from the side surface 5a of the light guide plate 5 so as to be disposed on the entire surface of the plurality of first protrusions 2c in correspondence with the plurality of first protrusions 2c The thickness of the light guide plate 5 is the same. A second fixing hole 5c is formed on each of the second projecting portions 5b so as to correspond to the first fixing hole 2d of the bottom cover 2. [

The fixing clip portion 6a of the panel guide 6 shown in Fig. 3C is disposed on the side surface of the bottom cover 2 and also on the incised region 2b of the bottom cover 2 and the second protrusion 2b of the light guide plate 5. [ A clip wall surface 6d formed so as to cover the first and second fixing holes 5b and 5b and a plurality of first fixing holes 2d and a plurality of second fixing holes 5c protruding inward of the clip wall surface 6d, And a plurality of third protrusions 6c that are configured to be able to be formed.

FIG. 4 is a perspective view illustrating an assembled state in which the first and second assembly fixing portions and the fixing clip portions shown in FIGS.

4, the second assembly fixing portion of the light guide plate 5 corresponds to the first assembly fixing portion formed in the side incision region of the bottom cover 2, Lt; / RTI > When the panel guide 6 is assembled, the fixing clip portion 6a of the panel guide 6 is fastened to the first and second assembly fixing portions so that the bottom cover 2, the light guide plate 5, 6 are fastened and fixedly assembled.

As described above, when the plurality of light source fixing parts 3 are arranged to irradiate light in the form of facing the light sources 4 along the longitudinal direction of both sides of the light guide plate 5, the light efficiency can be improved, The light guide plate 5 should be subjected to the expansion and contraction deformation of the light guide plate 5.

1 and 4 of the present invention, after the first and second assembling and securing parts are formed on the unipolar central part of the light guide plate 5 on which the light sources 4 are not disposed, the panel guides 6 The fixing of the first and second assembly fixing portions with the fixing clip portion 6a of the light guide plate 5 can eliminate the deviation of the light emission luminance due to the expansion and contraction deformation of the light guide plate 5. [ That is, when the central portion of the end face of the light guide plate 5 is fixed, the light guide plate 5 is contracted and expanded equally in both longitudinal directions in which the light sources 4 are arranged. Accordingly, the light incidence efficiencies of the light sources 4 are all changed in the same manner, so that the deviation of the light emission luminance of the backlight unit can be minimized.

A predetermined gap is formed between the long side incidence surfaces of the light guide plate 5 and the respective light sources 4 so that even if the light guide plate 5 is expanded and shrunk and deformed, It is possible to prevent breakage of the battery.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Will be apparent to those of ordinary skill in the art.

Claims (10)

A plurality of light source fixing parts attached to inner sides of the bottom cover with a plurality of light sources attached thereto; And
And a light guide plate housed in the bottom cover to receive light from the respective light sources to the side incidence surface, and to guide the traveling direction of the light toward the front surface,
A plurality of fixing holes and a plurality of protruding portions are formed in the central portions of both sides of the bottom cover,
The light guide plate has a center portion on both sides of the light guide plate, the second assembly fixing portion including a plurality of fixing holes corresponding to the first assembly fixing portion and a plurality of protrusions,
Wherein the first and second assembling and fixing portions are respectively assembled and fixed to the fixing clip portion formed at the center portions of both side surfaces of the panel guide. The method according to claim 1,
The plurality of light source fixing parts
Wherein the light guide plate is fixedly disposed along the longitudinal direction of both sides of the light guide plate so that the light of the light sources is irradiated in a manner that the light guide plates are opposed to each other with the long-
Wherein each of the first and second assembling and fixing portions and the fixing clip portion is configured to correspond to a center portion of both ends of the bottom cover, the light guide plate, and the panel guide, respectively. 3. The method of claim 2,
The first assembly fixing portion of the bottom cover
A plurality of first fixing holes and a plurality of first protrusions are formed in a region of the four sidewall surfaces formed in the shape of a square frame, the center portions of both side walls facing each other being cut,
Wherein the plurality of first protrusions are formed to have the same thickness as a bottom surface of the bottom cover in a shape extending from a bottom surface of the bottom cover and the first fixing holes are formed on both sides of the first protrusions, Light unit. The method of claim 3,
The second assembly fixing portion of the light guide plate
And a plurality of second fixing holes and a plurality of second protrusions at center portions of both side surfaces of the light guide plate so as to correspond to the first assembly fixing section formation area of the bottom cover,
Wherein the plurality of second projections are configured to be the same as the thickness of the light guide plate so as to protrude from the side surface of the light guide plate so as to be disposed on the entire surface of the plurality of first projections corresponding to the plurality of first projections, And the second fixing holes are formed on both sides of the two protrusions so as to correspond to the first fixing holes of the bottom cover. 5. The method of claim 4,
The fixing clip portion of the panel guide
A clip wall surface configured to cover the cut-out area of the bottom cover and the second projections of the light guide plate so as to be disposed on the side surface of the bottom cover,
And a plurality of third protrusions protruding toward an inner side of the clip wall surface and adapted to be inserted into the plurality of first fixing holes and the plurality of second fixing holes, respectively. A liquid crystal panel having a plurality of pixel regions to display an image; A panel guide for seating and fixing the liquid crystal panel; And a backlight unit assembled so as to be positioned on a back surface of the liquid crystal panel and the panel guide and irradiating light to the liquid crystal panel,
The backlight unit
A plurality of light source fixing parts attached to inner sides of the bottom cover with a plurality of light sources attached thereto; And
And a light guide plate housed in the bottom cover to receive light from the respective light sources to the side incidence surface, and to guide the traveling direction of the light toward the front surface,
A plurality of fixing holes and a plurality of protruding portions are formed in the central portions of both sides of the bottom cover,
The light guide plate has a center portion on both sides of the light guide plate, the second assembly fixing portion including a plurality of fixing holes corresponding to the first assembly fixing portion and a plurality of protrusions,
Wherein the first and second assembling and fixing portions are respectively assembled and fixed to the fixing clip portion formed at the center portions of both side surfaces of the panel guide. The method according to claim 6,
The plurality of light source fixing parts
Wherein the light guide plate is fixedly disposed along the longitudinal direction of both sides of the light guide plate so that the light of the light sources is irradiated in a manner that the light guide plates are opposed to each other with the long-
Wherein each of the first and second assembly fixing portions and the fixing clip portion is configured to correspond to a center portion of both ends of the bottom cover, the light guide plate, and the panel guide, respectively. 8. The method of claim 7,
The first assembly fixing portion of the bottom cover
A plurality of first fixing holes and a plurality of first protrusions are formed in a region of the four sidewall surfaces formed in the shape of a square frame, the center portions of both side walls facing each other being cut,
Wherein the plurality of first protrusions extend from a bottom surface of the bottom cover to the same thickness as the bottom surface, and the first fixing holes are formed on both sides of the first protrusions, respectively. Display device. 9. The method of claim 8,
The second assembly fixing portion of the light guide plate
And a plurality of second fixing holes and a plurality of second protrusions at center portions of both side surfaces of the light guide plate so as to correspond to the first assembly fixing section formation area of the bottom cover,
Wherein the plurality of second projections are configured to be the same as the thickness of the light guide plate so as to protrude from the side surface of the light guide plate so as to be disposed on the entire surface of the plurality of first projections corresponding to the plurality of first projections, And the second fixing holes are formed on both sides of the two protrusions so as to correspond to the first fixing holes of the bottom cover. 10. The method of claim 9,
The fixing clip portion of the panel guide
A clip wall surface configured to cover the cut-out area of the bottom cover and the second projections of the light guide plate so as to be disposed on the side surface of the bottom cover,
And a plurality of third protrusions protruding toward an inner side of the clip wall surface and adapted to be inserted into the plurality of first fixing holes and the plurality of second fixing holes, respectively.

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