KR20180025527A - Liquid crystal display device - Google Patents

Abstract

According to the present invention, a liquid crystal display device comprises a liquid crystal display panel, a backlight unit, a cover bottom, a guide panel, and a first pad. The backlight unit is arranged under the liquid crystal display panel. The cover bottom comprises: a horizontal unit configured to surround a rear surface of the backlight unit; and a vertical unit extended from the horizontal unit to surround a side of the backlight unit. The guide panel comprises: a panel support unit configured to support an edge of the liquid crystal display panel from a lower portion; and an extension unit extended from the panel support unit to surround the vertical unit from the outside. A first pad surrounds a side of the liquid crystal display panel. The first pad includes a first body and a second body. The first body is extended in parallel with the extension unit to surround the side of the liquid crystal panel. The second body is extended from the first body in parallel with the panel support unit. The guide panel includes a sink hole into which the second body is inserted.

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

The present invention relates to a liquid crystal display device including a backlight unit.

The liquid crystal display device is used as a display device in various fields such as a portable computer such as a notebook PC, an office automation device, an audio / video device, an indoor / outdoor advertisement display, and a vehicle display. The liquid crystal display device can be divided into a reflective type, a semi-transmissive type, a transmissive type, and the like. A transflective or transmissive liquid crystal display device controls an electric field applied to a liquid crystal layer to display an image by controlling light incident from a backlight unit (BLU) according to a data voltage.

A fluorescent lamp such as a cold cathode fluorescent lamp (CCFL) has been used as a light source of a backlight unit. Recently, however, a light emitting diode (LED) .

Automotive displays are growing in size and increasing in quantity per vehicle. In addition to navigation, vehicle displays are also being applied as a driving support interface. Automotive displays are expanding coverage as instruments for instrument panels, driver warnings, and driving aids. In addition, a liquid crystal display (LCD) device is also applied to a head-up display (HUD) device that projects a vehicle speed, a remaining amount of fuel, navigation information, and the like in a graphic window on the window immediately before the driver. Liquid-crystal displays are being used for Rear-Seat Entertainment (RSE) systems to enjoy DVD movies and games in the back seat of a vehicle.

Vehicle displays are required to have visibility even in solar light, so that they are required to have a higher brightness than those of other displays, and are required to have reliability in automotive temperature conditions and vibration conditions.

A liquid crystal display device includes a liquid crystal display panel and a backlight unit. The backlight unit has a structure in which a light source is disposed so as to face the side face of the light guide plate and a plurality of optical sheets are disposed between the liquid crystal display panel and the light guide plate. The liquid crystal display panel and the backlight unit are assembled together with case members for fixing them, and are implemented as a liquid crystal module (LCM). The case member may include a guide panel, a cover bottom, a case top, and the like.

Among these, the case top is provided to cover the upper and side surfaces of the edge of the liquid crystal display panel, thereby shielding the edge of the liquid crystal display panel. The edge of the liquid crystal display panel shielded by the case top can be defined as a bezel area, and an increase in the area occupied by the bezel area lowers the aesthetics of the liquid crystal display device.

As a way to reduce the bezel area, consider removing the case top. However, when the case top is removed, there is no mechanism for supporting the side surface of the liquid crystal display panel, so that the liquid crystal display panel may not be fixed in place and may flow.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal display device including a separate mechanism capable of supporting a side surface of a liquid crystal display panel.

A liquid crystal display device according to the present invention includes a liquid crystal display panel, a backlight unit, a cover bottom, a guide panel, and a first pad. The backlight unit is disposed below the liquid crystal display panel. The cover bottom has a horizontal portion surrounding the back surface of the backlight unit and a vertical portion extending from the horizontal portion and surrounding the side surface of the backlight unit. The guide panel has a panel support portion for supporting the edge of the liquid crystal display panel from the bottom and an extension portion extending from the panel support portion for covering the vertical portion from the outside. The first pad covers the side surface of the liquid crystal display panel. The first pad includes a first body and a second body. The first body extends parallel to the extended portion so as to surround the side surface of the liquid crystal display panel. The second body extends in a direction parallel to the panel support from the first body. The guide panel includes a sink hole into which the second body is inserted.

A liquid crystal display device according to the present invention includes a liquid crystal display panel, a backlight unit, a cover bottom, a guide panel, and a second pad. The backlight unit is disposed below the liquid crystal display panel. The cover bottom has a horizontal portion surrounding the back surface of the backlight unit and a vertical portion extending from the horizontal portion and surrounding the side surface of the backlight unit. The guide panel has a panel support portion for supporting the edge of the liquid crystal display panel from the bottom and an extension portion extending from the panel support portion for covering the vertical portion from the outside. The second pad covers the side surface of the liquid crystal display panel. The panel supporting portion includes a through hole penetrating the inside thereof. The cover bottom includes protrusions protruding from the vertical portion so as to surround the side surfaces of the liquid crystal display panel and penetrating the through holes. The second pad includes an open hole through which the projection is drawn.

The present invention can arrest and restrict the movement of the liquid crystal display panel by providing a pad capable of supporting the side surface of the liquid crystal display panel. Accordingly, the present invention can prevent damage due to the flow of the liquid crystal display panel.

By providing the pad, the present invention can prevent damage due to the flow of the light guide plate and the optical sheets accommodated in the cover bottom. Accordingly, the present invention can prevent the problem that the optical characteristics of the liquid crystal display device are changed due to the damage of the light guide plate and the optical sheets, so that it is possible to provide a liquid crystal display device in which the image quality is maintained and the product reliability is improved.

1 is an exploded perspective view of a liquid crystal display device according to the present invention.
2 is a cross-sectional view taken along line I-I 'of FIG.
3 is a cross-sectional view taken along line II-II 'of FIG.
Figs. 4 and 5 are cross-sectional views showing a rear view before the first pad is fixed to the guide panel.
6 is a cross-sectional view taken along line III-III 'of FIG.
7 is an enlarged view of a state in which the second pad is fastened to the cover bottom.
FIG. 8 is a cross-sectional view taken on line III-III 'of FIG. 1 according to a modified embodiment of the present invention.
9 is a view for explaining the position of the second pad.
10 is a cross-sectional view taken on line III-III 'of FIG. 1 according to another modified embodiment of the present invention.
11 is a cross-sectional view taken along line III-III 'of FIG. 1, illustrating another modified embodiment of the present invention.

A manufacturing method of a liquid crystal display device of the present invention is a manufacturing method of a liquid crystal display device including a step of cleaning a substrate of a liquid crystal display panel, a step of patterning a substrate, an alignment film forming / rubbing step, a step of adhering a substrate and dropping a liquid crystal, a driving circuit mounting step, And the like.

The substrate cleaning process removes contaminants on the surfaces of the upper substrate and the lower substrate of the liquid crystal display panel with a cleaning liquid. The substrate patterning process includes forming and patterning various thin film materials such as signal lines including a data line and a gate line, a thin film transistor (TFT), and a pixel electrode on a lower substrate, a step of forming a black matrix, A filter, and a common electrode, and patterning the thin film material. In the alignment film forming / rubbing process, an alignment film is applied on substrates and the alignment film is rubbed with a rubbing film or optically aligned. Through the series of processes, the lower substrate of the liquid crystal display panel is provided with data lines to which a video data voltage is supplied, gate lines that intersect the data lines and are supplied with scan signals, that is, gate pulses sequentially, Pixels and TFT arrays including TFTs formed at intersections of lines, pixel electrodes of liquid crystal cells connected to TFTs, and storage capacitors are formed. The shift register of the gate drive circuit for generating the scan signal can be formed simultaneously with the pixel and the TFT array in the substrate patterning process. A black matrix, a color filter, and a common electrode are formed on the upper substrate of the liquid crystal display panel. The common electrode is formed on the upper substrate in a vertical electric field driving method such as a TN (Twisted Nematic) mode and a VA (Vertical Alignment) mode and is driven by a horizontal electric field drive such as an In Plane Switching (IPS) mode and a Fringe Field Switching Type pixel electrode and the lower substrate. A polarizing plate and a polarizing plate protective film are attached to the upper substrate and the lower substrate, respectively.

The liquid crystal dropping and substrate bonding process draws a sealant on one of the upper and lower substrates of a liquid crystal display panel and drops liquid crystal on another substrate. When the ultraviolet light source is irradiated on the ultraviolet curable sealant through the upper substrate or the lower substrate of the liquid crystal display panel, the sealant is cured and the upper substrate and the lower substrate are bonded together with the liquid crystal layer interposed therebetween.

The driving circuit mounting process mounts an integrated circuit (IC) of a data driving circuit on a lower substrate of a liquid crystal display panel using a COG (Chip On Glass) process, a COF (Chip On Film) process, or the like. The gate drive circuit may be formed directly on the lower substrate of the liquid crystal display panel as described above, or may be attached on the lower substrate by the COF process in the drive circuit mounting process. Subsequently, the driving circuit mounting process connects an integrated circuit (IC) and a printed circuit board (PCB) with a flexible printed circuit board (FPC) or a flexible flat cable (FFC).

The assembling process of the backlight unit connects the wiring to the light source and connects it to the light source driving circuit. The assembling process of the liquid crystal module assembles the liquid crystal display panel and the backlight unit, which are mounted with the driving circuit, into a liquid crystal module by using a guide panel, a cover bottom and the like.

The method of manufacturing a liquid crystal display device according to an embodiment of the present invention may further include an inspection process and a repair process. The inspection process includes an inspection for an integrated circuit, a signal wiring such as a data line and a gate line formed on the lower substrate, an electrical inspection for detecting defects of the TFT and the pixel electrode, an electrical inspection performed after the substrate adhesion and liquid crystal dropping process, And a lighting inspection for detecting a failure of the liquid crystal module by lighting the backlight unit of the liquid crystal module. The repair process repairs signal wiring defects and TFT defects that are determined to be repairable by the inspection process.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Like reference numerals throughout the specification denote substantially identical components. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In describing the various embodiments, the same components are represented at the outset and may be omitted thereafter.

Hereinafter, the structure of the liquid crystal display device according to the present invention will be described with reference to Figs. 1 and 2. Fig. 1 is an exploded perspective view of a liquid crystal display device according to the present invention. 2 is a cross-sectional view taken along line I-I 'of FIG.

1 and 2, the liquid crystal display device of the present invention includes a liquid crystal display panel (PNL) and a backlight unit disposed under the liquid crystal display panel (PNL). The liquid crystal display panel PNL includes an upper substrate USUB, a lower substrate LSUB and a liquid crystal layer interposed between the upper substrate USUB and the lower substrate LSUB as described above. The liquid crystal layer may be implemented in at least one of various liquid crystal modes.

Polarizing films UP and LP may be provided on the front surface and / or the back surface of the liquid crystal display panel PNL. The polarizing films UP and LP are provided on at least one of the front surface and the back surface of the liquid crystal display panel PNL so that only the components in a specific direction among the components of the light emitted from the backlight unit pass through.

A sealant RE covering the side surfaces of the lower substrate LSUB and the upper substrate USUB is formed on the sides of the lower substrate LSUB and the upper substrate USUB in order to protect the side surfaces of the lower substrate LSUB and the upper substrate USUB, sealed. The sealing resin may include, but is not limited to, an oligomer, a monomer, a photo-initiator, and an additive.

The backlight unit is provided under the liquid crystal display panel (PNL) and irradiates light to the back surface of the liquid crystal display panel (PNL). The backlight unit includes a light source LS and a light guide plate LGP, and at least one optical sheet (OPS). The light supplied from the light source LS to the light incidence surface of the light guide plate LGP is converted into the surface light source LS and emitted to the front surface of the light guide plate LGP, (OPS) while being uniformly irradiated onto the back surface of the liquid crystal display panel (PNL).

The light source LS may include at least one light source LS of a lamp such as a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL), and an external electrode fluorescent lamp (EEFL) . ≪ / RTI > The light source LS irradiates light to the side surface of the light guide plate LGP while facing at least one side (or the light entrance surface) of the light guide plate LGP. The light guide plate (LGP) is a plate formed of transparent plastic, for example, polymethly methacrylate (PMMA). The light guide plate LGP is a plate material in which light in the form of a point light source LS or a light source LS, .

The optical sheets OPS include one or more prism sheets and one or more diffuser sheets to diffuse the light incident from the light guide plate LGP and to reflect light incident on the light incident surface of the liquid crystal display panel PNL To refract the path of the light at an angle perpendicular to the light path.

Below the light guide plate LGP, a reflection sheet REF for reflecting the light incident from the light guide plate LGP and increasing the efficiency of light incident on the liquid crystal display panel PNL is disposed. The reflective sheet REF can be adhered to the cover bottom CB.

The liquid crystal display panel PNL and the backlight unit are assembled together by a case member such as a cover bottom CB and a guide panel GP to be implemented as a liquid crystal module (LCM).

The cover bottom CB is formed in a "C " shape whose cross section has at least one bent portion. The cover bottom CB includes a horizontal portion HP and a vertical portion VP. The horizontal portion HP is arranged to face the back surface of the backlight unit so as to face the back surface of the backlight unit. The vertical part VP extends from the horizontal part HP and is arranged to face the side surface of the backlight unit so as to face the side surface of the backlight unit. The vertical part VP extends from one end of the horizontal part HP to the front direction. That is, the vertical part VP has a shape protruding from the horizontal part HP in the front direction. A backlight unit including a light source LS, a light guide plate LGP, at least one optical sheet OPS, and the like is accommodated in the inner space provided by the horizontal portion HP and the vertical portion VP.

The cover bottom CB may include a material having a high thermal conductivity and a high rigidity so as to smoothly discharge the heat from the driving circuit and the light source LS to the outside. As an example, the cover bottom CB may be made of aluminum, aluminum nitride (AlN), electrogalvanized steel sheet (EGI), stainless steel (SUS), galvalume (SGLC), aluminum plated steel (aka ALCOSTA), tin plated steel And the like. Further, such a metal plate may be coated with a high conductivity material for promoting heat transfer.

The guide panel GP is formed in an "a " shape whose cross section has at least one bent portion. The guide panel GP includes a panel support SP and an extension LP. The panel supporting portion SP is provided between the liquid crystal display panel PNL and the backlight unit and supports the edge of the liquid crystal display panel PNL from the bottom. The panel support SP is provided between the liquid crystal display panel PNL and the optical sheet OPS to maintain a constant distance between the liquid crystal display panel PNL and the optical sheet OPS. The extension portion LP extends from the panel support portion SP and is arranged to surround the vertical portion VP of the cover bottom CB at the outside of the cover bottom CB. The extending portion LP extends from one end of the panel supporting portion SP in the backward direction.

The guide panel GP may have the shape of a rectangular frame having a through hole. The guide panel GP can be made of a plastic material that can be molded into a mold such as polycarbonate. The guide panel GP and the cover bottom CB can be mutually fixed using fastening means such as a hook.

The liquid crystal display panel PNL and the guide panel GP can be fixed to each other by an adhesive layer (LSA). The adhesive layer LSA is interposed between the edge of the liquid crystal display panel PNL and the panel support SP of the guide panel GP. The adhesive layer LSA can perform a function of restricting and restraining the mutual movement of the liquid crystal display panel PNL and the guide panel GP and a function of buffering the external force provided. Further, the adhesive layer (LSA) can function as a light shielding member by including a light shielding material in order to prevent light from leaking to the edge of the liquid crystal display panel (PNL).

The present invention does not need to cover the edge of the liquid crystal display panel PNL with a separate structure such as a case top in order to fix the movement of the liquid crystal display panel PNL. Therefore, the bezel area caused by blocking the edges of the liquid crystal display panel PNL by the case top can be eliminated or reduced.

However, when the case top is not provided, it is possible to flow in the lateral direction of the liquid crystal display panel (PNL). That is, when the case top is not provided, whether or not the liquid crystal display panel is fixed depends on the adhesive force of the adhesive layer, so that the liquid crystal display panel is not fixed at the current position due to external environmental change and is likely to be detached. In the case where the liquid crystal display panel PNL flows without being fixed at the position, damage may occur due to interference with other mechanisms, and optical characteristics of the liquid crystal display device may be changed to lower the product reliability. Therefore, in order to simultaneously satisfy the aesthetics and functionality of the liquid crystal display device, it is necessary to restrain and limit the movement in the lateral direction of the liquid crystal display panel while minimizing the area occupied by the bezel area.

3 is a cross-sectional view taken along line II-II 'of FIG. Figs. 4 and 5 are cross-sectional views showing a rear view before the first pad is fixed to the guide panel.

 3 to 5, the liquid crystal display according to the present invention includes at least one first pad IP for supporting the side surface of the liquid crystal display panel PNL. The first pad IP is provided on at least one side surface of the liquid crystal display panel PNL to restrict and restrict movement of the liquid crystal display panel PNL to the side surface. When a plurality of first pads IP are provided, the first pads IP may be spaced apart from each other by a predetermined distance.

The first pad IP includes a predetermined rigidity to support the side surface of the liquid crystal display panel PNL and restricts and restricts the movement of the liquid crystal display panel PNL. The first pad IP may include predetermined elasticity to prevent damage to the liquid crystal display panel PNL that may be caused by mutual interference with the liquid crystal display panel PNL.

The first pad IP may include a predetermined elasticity and function as a shock absorbing member for absorbing external force. The first pad IP may function as a light shielding member for preventing light leakage to the side surface of the liquid crystal display panel PNL, including a light shielding material. The first pad IP may be any one of silicon, polycarbonate, and rubber, but is not limited thereto.

The first pad IP includes a first body B1 and a second body B2. The first body B1 extends in a direction parallel to the extending portion LP of the guide panel GP and covers the side surface of the liquid crystal display panel PNL. The second body B2 extends from the first body B1 in a direction parallel to the panel support SP of the guide panel GP. The first body B1 and the second body B2 may be formed as one body.

The first pad IP is fixed to the guide panel GP. The first pad IP and the guide panel GP can be fastened with the coupling structure of the second body B2 and the sink hole IH. That is, the guide panel GP is provided with a sink hole IH into which the second body B2 of the first pad IP can be inserted. The sink hole IH may have a shape passing through a part of the extended portion LP of the guide panel GP. The sinkhole IH is formed to have a shape corresponding to the second body B2 of the first pad IP and can be inserted in a ratio of 1: 1 with the second body B2 of the first pad IP .

The first pad IP and the guide panel GP can be assembled as follows. The first pad IP is pushed toward the guide panel GP with the second body B2 of the first pad IP aligned with the sink hole IH of the guide panel GP. Thus, the second body B2 of the first pad IP is inserted into the sink hole IH of the guide panel GP.

Since the second body B2 of the first pad IP has a predetermined elasticity, it can be drawn into the sink hole IH of the guide panel GP in a compressed state. The second body B2 of the first pad IP may be fitted to the sink hole IH of the guide panel GP in a fitting structure. Accordingly, the first pad IP is fixed to the guide panel GP, and its movement can be restricted and restricted.

The second body B2 of the first pad IP which is drawn into the sink hole IH of the guide panel GP is moved in the vertical direction of the panel support portion SP of the guide panel GP and the vertical portion 0.0 > VP). ≪ / RTI > The second body B2 of the first pad IP is inserted into the space between the panel supporting portion SP of the guide panel GP and the vertical portion VP of the cover bottom CB to press the panel supporting portion SP downward And the vertical part VP of the cover bottom CB supports the second body B2 of the first pad IP from below. The first pad IP that is drawn into the sinkhole IH can be fastened in a structure in which it is engaged with the panel support SP of the guide panel GP and the vertical portion VP of the cover bottom CB. To this end, the height h2 of the vertical part VP located in the area where the first pad IP is drawn is formed to have a height lower than the height h1 of the vertical part VP located in the peripheral area .

The first body B1 of the first pad IP is disposed outside the liquid crystal display panel PNL so as to surround the side surface of the liquid crystal display panel PNL and therefore the first body B1 of the first pad IP ) Is recognized as a bezel area from the front side of the liquid crystal display device. In order to minimize the bezel area, it is preferable that the thickness of the first body B1 is formed to have a minimum thickness for securing a predetermined rigidity for supporting the side surface of the liquid crystal display panel PNL. For example, it is preferable that the thickness of the first body B1 is equal to the thickness of the guide panel GP or is thinner than the thickness of the guide panel GP. This means that the first body B1 of the first pad IP can be positioned on the inner side without protruding beyond the extension LP of the guide panel GP. Accordingly, the present invention can implement a liquid crystal display capable of supporting the side surface of the liquid crystal display panel (PNL) without increasing the bezel area.

The sink hole IH of the guide panel GP can be formed by passing through a part of the extended portion LP of the guide panel GP while removing a portion AR of the panel support portion SP. That is, in the region where the sinkhole IH is formed, the panel support portion SP may have a shape that is partially recessed inward (AR). In this case, the first body B1 of the first pad IP may be positioned inward by a space provided by removing a part AR of the panel supporting portion SP. This means that the first body B1 of the first pad IP can be positioned on the inner side without protruding beyond the extension LP of the guide panel GP. Accordingly, the present invention can implement a liquid crystal display capable of supporting the side surface of the liquid crystal display panel (PNL) without increasing the bezel area.

The first pad IP may further include a third body B3 extending from the first body B1. The third body B3 extends in a direction parallel to the second body B2 and is spaced apart from the second body B2 by a predetermined distance. The first body B1 and the third body B3 may be formed as one body.

The third body B3 overlaps the second body B2 with the panel support SP interposed therebetween. The third body B3 is provided between the panel supporting portion SP of the guide panel GP and the liquid crystal display panel PNL to support the liquid crystal display panel PNL from below. The third body B3 can compensate for the height difference between the panel support portion SP of the guide panel GP and the liquid crystal display panel PNL at the edge of the liquid crystal display panel PNL.

The panel supporting portion SP of the guide panel GP may be fitted in a space provided between the second body B2 and the third body B3. The panel supporting portion SP of the guide panel GP is inserted in the space between the second body B2 and the third body B3 to support the third body B3 from below and the first body The second body B2 supports the panel support SP of the guide panel GP from below. The panel support SP of the guide panel GP can be fastened in a structure that is engaged by the second body B2 and the third body B3 of the first pad IP. This means that the panel support SP of the guide panel GP and the first pad IP can be firmly fastened.

6 is a cross-sectional view taken along line III-III 'of FIG. 7 is an enlarged view of a state in which the second pad is fastened to the cover bottom.

6 and 7, the liquid crystal display according to the present invention includes at least one second pad RP for supporting the side surface of the liquid crystal display panel PNL. The second pad RP is disposed on at least one side surface of the liquid crystal display panel PNL to restrict and restrict movement of the liquid crystal display panel PNL to the side surface. When the plurality of second pads RP are provided, the second pads RP may be spaced apart from each other by a predetermined distance.

The second pad RP includes a predetermined rigidity to support the side surface of the liquid crystal display panel PNL and restricts and restricts the movement of the liquid crystal display panel PNL. The second pad RP includes a predetermined elasticity to prevent damage to the liquid crystal display panel PNL that may be caused by mutual interference with the liquid crystal display panel PNL.

The second pad RP includes a predetermined elasticity and can function as a buffer member for buffering an external force to be provided. The second pad RP may function as a light shielding member for preventing light leakage to the side surface of the liquid crystal display panel PNL, including a light shielding material. The second pad RP may be any one of silicon, polycarbonate, and rubber, but is not limited thereto.

Hereinafter, an example in which the second pad RP is fixed by the case member will be described. The second pad RP includes an open hole OH. The cover bottom CB includes a protrusion PD protruding from the vertical portion VP so as to be insertable into the open hole OH. The projection PD extends to cover the side surface of the liquid crystal display panel PNL. The panel supporting portion SP of the guide panel GP is provided with a through hole PH through which the protruding portion PD can penetrate so that the protruding portion PD can protrude to the side surface of the liquid crystal display panel PNL.

The protruding portion PD can pass through the through hole PH of the guide panel GP and enter the open hole OH of the second pad RP. Therefore, the second pad RP may be provided so as to surround the protruding portion PD of the cover bottom CB which is drawn into the open hole OH. The panel support SP of the guide panel GP supports the second pad RP underneath.

The projecting portion PD of the cover bottom CB can be engaged with the open hole OH of the second pad RP in a fitting structure. Since the second pad RP has a predetermined elasticity, it can be coupled to the protruding portion PD of the cover bottom CB in a compressed state. Accordingly, the second pad RP is fixed to the projection PD of the cover bottom CB, and its movement can be restricted and restricted. Although not shown, a stopper for preventing the second pad RP from being separated from the protrusion PD may be further formed.

The projection PD of the cover bottom CB and the open hole OH of the second pad RP can guide mutually fastening directions. That is, the present invention has a structure in which the projection PD of the cover bottom CB is inserted into the open hole OH passing through the inside of the second pad RP, The alignment and fastening operation of the two pads RP and the protrusions PD is easy and simple.

FIG. 8 is a cross-sectional view taken on line III-III 'of FIG. 1 according to a modified embodiment of the present invention. 9 is a view for explaining the position of the second pad.

8, the second pad RP further includes a first protrusion BP1 extending in the direction of the horizontal part HP along the vertical part VP in the inner space provided by the cover bottom CB can do. The first protrusion BP1 is provided between the vertical part VP of the cover bottom CB and the light guide plate LGP and between the vertical part VP of the cover bottom CB and the optical sheets OPS, It is possible to prevent the flow of the light guide plate LGP and the optical sheets OPS in the X axis direction and in the Y axis direction in the internal space provided by the light guide plate CB.

Since the first projection part BP1 has a predetermined elasticity, the first projection part BP1 can be drawn between the vertical part VP of the cover bottom CB and the light guide plate LGP in a compressed state. The first protrusion BP1 can be fitted between the vertical portion VP of the cover bottom CB and the light guide plate LGP. Accordingly, the first protrusions BP1 of the second pads RP can be prevented from expanding, shrinking, contracting, or causing the light guide plate LGP and / or the optical sheets OPS due to external factors such as temperature change, humidity change, The positional change of the LGP and / or the optical sheets OPS can be suppressed by absorbing the external force and impact transmitted from the LGP and / or the OPS when the displacement is generated.

The present invention restricts the movement of the light guide plate (LGP) and / or the optical sheets (OPS) so that the light guide plate (LGP) and / or the optical sheets (OPS) are damaged due to mutual interference between the light guide plate Or noise can be prevented from occurring. Furthermore, the present invention can prevent the optical characteristics of the liquid crystal display device from being changed due to damage of the LGP and the optical sheets (OPS). Thus, the present invention can provide a liquid crystal display device with improved product reliability.

9, a guide hole GH may be formed at one side edge of the light guide plate LGP. The end of the first projection BP1 may be drawn into the guide hole GH of the light guide plate LGP and may be positioned between the vertical portion VP of the cover bottom CB and the light guide plate LGP.

The guide hole GH may have a shape corresponding to the shape of the first protrusion BP1. The guide hole GH can be formed by removing (or sinking) a part of the light guide plate LGP at one side edge of the light guide plate LGP. The first protrusion BP1 can be inserted into the guide hole GH in a compressed state. The first protrusion BP1 is fitted in the guide hole GH to prevent movement of the light guide plate LGP and the optical sheets OPS.

For example, the light source LS and the light guide plate LGP are located in the inner space provided by the cover bottom CB. The light source LS may be provided on at least one side of the cover bottom CB. The light guide plate LGP is supplied with light from the light source LS through the light-incident surface facing the light source LS.

The light entrance surface of the light guide plate LGP is spaced apart from the light source LS by a predetermined distance L in order to prevent a collision with the light source LS and heat damage due to the high temperature heat generated from the light source LS. The spacing distance L between the light entrance surface of the light guide plate LGP and the light source LS can be appropriately selected in consideration of the heat radiation design of the light source LS and the light loss from the light source LS.

In order to maintain the spacing L between the light incident surface of the light guide plate LGP and the light source LS, a support portion BR may be provided at the edge of the light incident surface. The support portion BR may have a shape extending from the light incidence surface and protruding in the direction of the cover bottom CB. The support portion BR surrounds the side surface of the light source LS and can directly contact the vertical portion VP of the cover bottom CB.

The first protrusion BP1 of the second pad RP may be located at least one of the edges of the light-incident surface of the light guide plate LGP. The first protrusion BP1 of the second pad RP can be guided into the guide hole GH provided in at least one of the edges of the light receiving surface of the light guide plate LGP. The light-receiving surface of the light guide plate LGP means one surface opposed to the light-incident surface of the light guide plate LGP.

The first protrusion BP1 of the second pad RP is provided between the light guide plate LGP and the cover bottom CB in a compressed state and the light guide plate LGP is moved in the opposite direction You can push it. This is because the vertical part VP of the light guide plate LGP and the cover bottom CB and the vertical part VP of the cover bottom CB are kept in contact with each other so that the movement of the light guide plate LGP It means that it can be restrained.

10 is a cross-sectional view taken on line III-III 'of FIG. 1 according to another modified embodiment of the present invention.

Referring to FIG. 10, the second pad RP may further include a second protrusion BP2 extending in a direction parallel to the panel support SP in an inner space provided by the cover bottom CB. The second protrusion BP2 may pass through the through hole PH and be positioned above the edge of the optical sheet OPS. The second protrusion BP2 is located on the edge of the optical sheet OPS and can prevent the optical sheets OPS and LGP from flowing in the Z axis direction. At this time, the second projection BP2 can directly contact the upper side of the optical sheet OPS to press the optical sheet OPS downward, and accordingly, the movement of the optical sheet OPS in the X- It is possible to prevent movement in the Y-axis direction.

Although not shown, the second projection BP2 may extend to the upper side of the panel supporting portion SP and be disposed between the panel supporting portion SP and the liquid crystal display panel PNL. In this case, the second protrusion BP2 can compensate for the height difference between the liquid crystal display panel PNL and the panel support SP at the edge of the liquid crystal display panel PNL. Thereby, there is an advantage that the liquid crystal display panel (PNL) can be prevented from being shifted or shaken.

11 is a cross-sectional view taken on line III-III 'of FIG. 1 according to still another modified embodiment of the present invention.

11, the second pad RP includes a first protrusion BP1 extending in the direction of the horizontal part HP along the vertical part VP in the inner space provided by the cover bottom CB, And a second protrusion BP2 extending in parallel to the support portion SP.

The first protrusion BP1 is provided between the vertical part VP of the cover bottom CB and the light guide plate LGP and between the vertical part VP of the cover bottom CB and the optical sheets OPS, It is possible to prevent the flow of the light guide plate LGP and the optical sheets OPS in the X axis direction and in the Y axis direction in the internal space provided by the light guide plate CB.

The second protrusion BP2 is located above the optical sheet OPS and can prevent the optical sheets OPS and LGP from flowing in the Z-axis direction. At this time, the second projection BP2 contacts the upper edge of the optical sheet OPS to press the optical sheet OPS downward. Accordingly, the movement of the optical sheet OPS in the X- It is possible to prevent the movement in the axial direction.

The present invention provides the optical sheets OPS and the LGP LGP in the inner space of the cover bottom CB by providing the second pad RP including both the first protrusion BP1 and the second protrusion BP2, So that it can be more firmly fixed within the frame. Accordingly, the present invention can prevent the problem that the optical characteristics of the liquid crystal display device are changed due to the damage of the light guide plate (LGP) and the optical sheets (OPS), so that the liquid crystal display device .

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

PNL: liquid crystal display panel GP: guide panel
SP: panel support LP: extension
OPS: optical sheet LGP: light guide plate
CB: Cover bottom HP: Horizontal part
VP: Vertical IP: 1st pad
RP: second pad

Claims (10)

A liquid crystal display panel;
A backlight unit disposed below the liquid crystal display panel;
A cover bottom having a horizontal portion surrounding a back surface of the backlight unit and a vertical portion extending from the horizontal portion and surrounding a side surface of the backlight unit; And
A guide panel having a panel support portion for supporting the edge of the liquid crystal display panel from below and an extension portion extending from the panel support portion so as to surround the vertical portion from the outside; And
And a first pad surrounding a side surface of the liquid crystal display panel,
Wherein the first pad comprises:
A first body extending in parallel with the extension portion so as to surround a side surface of the liquid crystal display panel; And
And a second body extending from the first body in a direction parallel to the panel support,
The guide panel includes:
And a sink hole into which the second body is inserted. The method according to claim 1,
The sink hole
Wherein the panel support portion has a shape that is partially recessed inward. The method according to claim 1,
The second body may include:
A panel support portion disposed between the panel support portion and the vertical portion,
The height of the vertical portion of the region into which the first pad is drawn,
Wherein the height of the vertical portion of the peripheral region is lower than the height of the vertical portion of the peripheral region. Wherein the first pad comprises:
And a third body extending parallel to the second body from the first body,
The third body may include:
And the liquid crystal display panel is disposed between the liquid crystal display panel and the panel supporting portion. A liquid crystal display panel;
A backlight unit disposed below the liquid crystal display panel;
A cover bottom having a horizontal portion surrounding a back surface of the backlight unit and a vertical portion extending from the horizontal portion and surrounding a side surface of the backlight unit; And
A guide panel having a panel support portion for supporting the edge of the liquid crystal display panel from below and an extension portion extending from the panel support portion so as to surround the vertical portion from the outside; And
And a second pad surrounding a side surface of the liquid crystal display panel,
The panel-
And a through hole penetrating the inside thereof,
The cover bottom,
And a protrusion protruding from the vertical portion so as to surround a side surface of the liquid crystal display panel and penetrating the through hole,
The second pad
And an open hole through which the protrusion is drawn. 6. The method of claim 5,
The backlight unit includes:
A light guide plate and an optical sheet sequentially stacked,
The second pad
And a first protrusion extending between the vertical portion and the light guide plate in an inner space provided by the cover bottom. The method according to claim 6,
The light-
And a guide hole provided at one side edge,
Wherein an end of the first projecting portion
And the liquid crystal display device is drawn into the guide hole. 8. The method of claim 7,
The backlight unit includes:
And a light source that is provided on at least one side of the light guide plate and emits light to the light entrance surface of the light guide plate,
The light-
And a support portion provided on at least one of edges of the light incident surface of the light guide plate and extending from the light incident surface of the light guide plate to extend in the vertical direction of the cover bottom,
The first projecting portion
And the edge of the light-incident surface facing the light-incident surface of the light guide plate. 6. The method of claim 5,
The backlight unit includes:
A light guide plate and an optical sheet sequentially stacked,
The second pad
And a second protrusion which is in contact with the upper edge of the optical sheet through the through-hole in the inner space provided by the cover bottom. 10. The method of claim 9,
The second projecting portion
And a liquid crystal display panel extending from the panel supporting portion to the upper side thereof, the liquid crystal display panel being disposed between the panel supporting portion and the liquid crystal display panel.

Images