KR102556521B1 - Liquid crystal display device - Google Patents

Abstract

A liquid crystal display device according to the present invention includes a liquid crystal display panel, a light guide plate, a cover bottom, a first buffer member, and a second buffer member. The light guide plate is disposed on the rear surface of the liquid crystal display panel to transmit light incident from a light source to the front surface, and has first and second concave grooves respectively provided on opposite left and right side surfaces. The cover bottom includes a horizontal portion and a vertical portion. The horizontal portion surrounds the rear surface of the light guide plate. The vertical portion extends from the horizontal portion and has a first concave portion fitted to the first concave portion and a second concave portion matched to the second concave portion. The first cushioning member is provided between the first concave portion and the first concave portion. The second buffer member is provided between the second concave portion and the first concave groove.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

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

Liquid crystal display devices are used as display devices in various fields such as portable computers such as notebook PCs, office automation devices, audio/video devices, indoor and outdoor advertising displays, and vehicle displays. The liquid crystal display may be divided into a reflective type, a transflective type, a transmissive type, and the like. A transflective or transmissive liquid crystal display displays an image by controlling an electric field applied to a liquid crystal layer to adjust light incident from a back light unit (BLU) according to a data voltage.

Fluorescent lamps such as Cold Cathode Fluorescent Lamps (CCFLs) have been used as light sources for backlight units, but recently, light emitting diodes (hereinafter referred to as 'LEDs') are mainly used compared to conventional fluorescent lamps. It is becoming.

In-vehicle displays are getting larger in size and the quantity installed per vehicle is also increasing. In-vehicle displays are being applied as driving support interfaces in addition to navigation. Vehicle displays are expanding their application range to instrument panels, driver warnings, and display means for driving assistance. In addition, liquid crystal displays are also being applied to Head-Up Display (HUD) devices that project vehicle speed, remaining fuel, and navigation information as graphic images on the windshield right in front of the driver. A liquid crystal display is being applied for a Rear-Seat Entertainment (RSE) system for enjoying DVD movies or games in the back seat of a vehicle.

Since the display for a vehicle requires visibility even in sunlight, high brightness is required compared to displays for other purposes, and reliability under vehicle temperature conditions and vibration conditions is required.

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 to face a side surface 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 that fix them to be implemented as a liquid crystal module (LCM). The case member may include a guide panel, a cover bottom, a case top, and the like.

The light guide plate accommodated in the case member may expand or contract or move its position due to external factors such as temperature change, humidity change, external shock, or vibration. When the light guide plate moves and is damaged, the optical characteristics of the liquid crystal display may be changed. This deteriorates product reliability of the liquid crystal display device, such as causing poor image quality.

The present invention provides a liquid crystal display capable of preventing movement of a light guide plate that may occur due to external factors such as temperature change, humidity change, external shock, and vibration, and preventing damage due to thermal deformation of the light guide plate. aims to

A liquid crystal display device according to the present invention includes a liquid crystal display panel, a light guide plate, a cover bottom, a first buffer member, and a second buffer member. The light guide plate is disposed on the rear surface of the liquid crystal display panel, transmits light incident from a light source to the front surface, and has first concave grooves and second concave grooves provided on opposite left and right side surfaces, respectively. The cover bottom includes a horizontal portion and a vertical portion. The horizontal portion surrounds the rear surface of the light guide plate. The vertical portion extends from the horizontal portion and has a first concave portion fitted to the first concave portion and a second concave portion matched to the second concave portion. The first cushioning member is provided between the first concave portion and the first concave portion. The second buffer member is provided between the second concave portion and the first concave groove.

According to the present invention, movement of the light guide plate that may occur due to external factors such as temperature change, humidity change, external shock, and vibration can be prevented by changing the shape of the light guide plate and the cover bottom. Accordingly, it is possible to prevent damage to the light guide plate and the optical sheets due to the flow, and to reduce noise generated by the flow of the light guide plate.

1 is an exploded perspective view of a liquid crystal display device according to the present invention.
2 is a plan view illustrating a fastening structure between a cover bottom and a light guide plate according to the present invention.
3 is a perspective view illustrating a fastening structure between a cover bottom and a light guide plate according to the present invention.
4 is a cross-sectional view of FIG. 2 taken along line I-I'.
5 is a cross-sectional view of FIG. 2 taken along line II-II'.
6 is an enlarged view of an upper stepped portion of a first concave portion and a lower stepped portion of a second concave portion.
7 is an enlarged view of the first concave portion and the first concave portion combined.
8 is a plan view schematically illustrating a liquid crystal display according to an exemplary embodiment of the present invention.
9 is a cross-sectional view of FIG. 8 taken along line III-III'.

The manufacturing method of the liquid crystal display device includes substrate cleaning of the liquid crystal display panel, substrate patterning process, alignment film formation/rubbing process, substrate bonding and liquid crystal dropping process, driving circuit mounting process, backlight unit assembly process, liquid crystal module assembly process, etc. do.

In the substrate cleaning process, foreign substances contaminated on the surfaces of the upper and lower substrates of the liquid crystal display panel are removed with a cleaning solution. The substrate patterning process includes a process of forming and patterning various thin film materials such as signal lines including data lines and gate lines, thin film transistors (TFTs), and pixel electrodes on the lower substrate, and black matrix and color on the upper substrate. It includes a process of forming and patterning various thin film materials such as a filter and a common electrode. In the alignment film formation/rubbing process, an alignment film is applied on substrates, and the alignment film is rubbed with a rubbing cloth or subjected to photo-alignment treatment. Through these series of processes, the data lines to which the video data voltage is supplied to the lower substrate of the liquid crystal display panel, the gate lines to cross the data lines and to sequentially supply the scan signal, that is, the gate pulse, the data lines and the gate A pixel and TFT array including TFTs formed at the intersection of the lines, pixel electrodes of a liquid crystal cell connected to the TFTs, and a storage capacitor are formed. A shift register of a gate driving circuit generating a scan signal may be formed simultaneously with a pixel and a TFT array in a 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 vertical electric field driving methods such as TN (Twisted Nematic) mode and VA (Vertical Alignment) mode, and horizontal electric field driving such as IPS (In Plane Switching) mode and FFS (Fringe Field Switching) mode. In this method, it is formed on the lower substrate together with the pixel electrode. A polarizing plate and a polarizing plate protective film are attached to each of the upper substrate and the lower substrate.

In the liquid crystal dropping and bonding process, sealant is drawn on one of the upper and lower substrates of the liquid crystal display panel and liquid crystal is dropped on the other substrate. When an ultraviolet light source is irradiated to the ultraviolet curable sealant through the upper or lower substrate of the liquid crystal display panel, the sealant is cured, and the upper and lower substrates are bonded with the liquid crystal layer interposed therebetween.

In the driving circuit mounting process, an integrated circuit (IC) of a data driving circuit is mounted on a lower substrate of a liquid crystal display panel using a COG (Chip On Glass) process or a COF (Chip On Film) process. As described above, the gate driving circuit may be directly formed on the lower substrate of the liquid crystal display panel, or may be attached on the lower substrate through a COF process in a driving circuit mounting process. Subsequently, in the driving circuit mounting process, an integrated circuit (IC) and a printed circuit board (PCB) are connected with a flexible printed circuit board (FPC) or a flexible flat cable (FFC).

In the assembling process of the backlight unit, wires are connected to the light source and connected to the light source driving circuit. In the assembly process of the liquid crystal module, a liquid crystal display panel mounted with a driving circuit and a backlight unit are assembled into a liquid crystal module using a guide panel, a cover bottom, a case top, and the like.

The manufacturing method of the liquid crystal display device may further include an inspection process and a repay process. The inspection process includes inspection of integrated circuits, signal wiring such as data lines and gate lines formed on the lower substrate, electrical inspection to detect defects in TFTs and pixel electrodes, electrical inspection performed after substrate bonding and liquid crystal dropping processes, and clean room It includes a lighting inspection for detecting assembly defects of optical sheets performed in , and a lighting inspection for detecting defects in the liquid crystal module by turning on the backlight unit of the liquid crystal module. The repair process repairs signal wiring defects and TFT defects determined to be repairable by the inspection process.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Like reference numbers throughout the specification indicate substantially the same elements. In the following description, if it is determined that a detailed description of a known function or configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In describing various embodiments, the same components are representatively described at the beginning and may be omitted thereafter.

Terms including ordinal numbers, such as first and second, may be used to describe various components, but the components are not limited by the terms. These terms are only used for the purpose of distinguishing one component from another.

1 is an exploded perspective view of a liquid crystal display device according to the present invention. 2 is a plan view illustrating a fastening structure between a cover bottom and a light guide plate according to the present invention. 3 is a perspective view illustrating a fastening structure between a cover bottom and a light guide plate according to the present invention. 4 is a cross-sectional view of FIG. 2 taken along line I-I'. 5 is a cross-sectional view of FIG. 2 taken along line II-II'.

1 to 5, 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). As described above, the liquid crystal display panel PNL includes an upper substrate, a lower substrate, and a liquid crystal layer interposed between the upper and lower substrates. The liquid crystal layer may be implemented in at least one mode among various liquid crystal modes.

The backlight unit is provided under the liquid crystal display panel PNL, and irradiates light to the rear surface of the liquid crystal display panel PNL. The backlight unit includes a light source LS, a light guide plate LGP, and at least one optical sheet OPS. The light supplied from the light source LS to the light incident surface of the light guide plate LGP is converted into a form of the surface light source LS and emitted to the front surface of the light guide plate LGP, and the optical sheet positioned on the light guide plate LGP. While passing through (OPS), it is uniformly irradiated to the rear surface of the liquid crystal display panel (PNL).

The light source (LS) is one or more light sources (LS) of lamps such as a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL), and an external electrode fluorescent lamp (EEFL). can include The light source LS radiates light to a side surface of the light guide plate LGP facing at least one side surface (or light incident surface) of the light guide plate LGP. The light guide plate (LGP) is a plate material molded from transparent plastic, for example, polymethacrylate (PMMA), and converts light in the form of a point light source (LS) or line light source (LS) into light in the form of a surface light source (LS). plays a role in converting

The optical sheet OPS includes one or more prism sheets and one or more diffuser sheets to diffuse light incident from the light guide plate LGP and to substantially affect the light incident surface of the liquid crystal display panel PNL. refracts the path of light at a perpendicular angle. The optical sheet OPS may further include functional sheets such as a multilayer optical film (DBEF-D (MOF)) and a protection film.

A reflection sheet REF may be disposed under the light guide plate LGP to increase the efficiency of the light incident on the liquid crystal display panel PNL by reflecting the light incident from the light guide plate LGP. The reflective sheet REF may be adhered to the cover bottom CB.

The liquid crystal display panel (PNL) and backlight unit are assembled together with the cover bottom (CB), guide panel (GP), and case top (CT) to form a liquid crystal module (LCM). is implemented

A cross section of the cover bottom CB may be formed in an “L” shape having at least one curved portion. The cover bottom CB includes a horizontal portion HP and a vertical portion VP. The horizontal portion HP is disposed to face the rear surface of the backlight unit and surround the rear surface of the backlight unit. The vertical portion VP extends from the horizontal portion HP and is disposed to face the side surface of the backlight unit and surround the side surface of the backlight unit. The vertical portion VP extends from one end of the horizontal portion HP in the front direction. That is, the vertical portion VP has a shape protruding from the horizontal portion HP in the front direction. A backlight unit including a light source LS, a light guide plate LGP, an optical sheet OPS, and the like is accommodated in the internal space provided by the horizontal portion HP and the vertical portion VP.

The cover bottom CB may include a material having high thermal conductivity and high stiffness so as to smoothly dissipate heat from the driving circuit and the light source LS to the outside. For example, the cover bottom (CB) is made of aluminum, aluminum nitride (AlN), electro-galvanized steel (EGI), stainless (SUS), galvalume (SGLC), aluminum-plated steel (aka ALCOSTA), tin-plated steel (SPTE) It may be made of a metal plate such as In addition, such a metal plate may be coated with a high-conductivity material to promote heat transfer.

A cover shield CS may be disposed at one edge of the cover bottom CB. The cover shield CS may be provided in an area corresponding to an area where a driving circuit, a PCB, and the like are disposed. The cover bottom CB and the cover shield CS may include a material having high thermal conductivity and high stiffness so as to smoothly dissipate heat from the driving circuit and the PCB to the outside. For example, the cover bottom (CB) is made of aluminum, aluminum nitride (AlN), electro-galvanized steel (EGI), stainless (SUS), galvalume (SGLC), aluminum-plated steel (aka ALCOSTA), tin-plated steel (SPTE) It may be made of a metal plate such as In addition, such a metal plate may be coated with a high-conductivity material to promote heat transfer.

The guide panel GP is disposed below the liquid crystal display panel PNL. The guide panel GP is provided between the liquid crystal display panel PNL and the backlight unit, and supports an edge of the liquid crystal display panel PNL from a lower portion. The guide panel GP maintains a constant distance between the liquid crystal display panel PNL and the optical sheet OPS. The guide panel GP may extend to surround the vertical portion VP of the cover bottom CB from the outside and may extend to surround the side surface of the liquid crystal display panel PNL from the outside.

The guide panel GP may have a rectangular frame shape through which a center is penetrated. The guide panel GP may be made of a plastic-based material that can be molded into a mold, such as polycarbonate.

The liquid crystal display panel PNL and the guide panel GP may be mutually fixed by the adhesive layer LSA. The adhesive layer LSA is interposed between the edge of the liquid crystal display panel PNL and the panel support part SP of the guide panel GP. The adhesive layer LSA may perform a function of restraining and restricting mutual movement of the liquid crystal display panel PNL and the guide panel GP, and a function of buffering an applied external force. In addition, the adhesive layer LSA may function as a light blocking member by including a light blocking material to prevent light from leaking to the edge of the liquid crystal display panel PNL.

The case top CT is disposed to surround the side surfaces of the guide panel GP and the cover bottom CB. The case top CT may be formed in an “L” shape having at least one bent portion in its cross section. The case top CT includes a first body B1 and a second body B2. The first body B1 covers the front edge of the liquid crystal display panel PNL. The second body B2 extends from the first body B1 and is disposed outside the guide panel GP to surround the guide panel GP. The second body B2 extends from one end of the first body B1 in the rear direction.

The case top CT may be fixed to the guide panel GP and/or the cover bottom CB by a screw or screwless fastening method. The case top CT may be made of a metal plate such as electro-galvanized steel (EGI), stainless (SUS), galvalume (SGLC), aluminum-coated steel (aka ALCOSTA), or tin-plated steel (SPTE).

In the inner space provided by the cover bottom CB, the light source LS and the light guide plate LGP are positioned. The light source LS may be disposed opposite to at least one of upper and lower surfaces of the light guide plate LGP. The light source LS is at least between the upper side of the light guide plate LGP and the vertical portion VP of the cover bottom CB and/or between the lower side of the light guide plate LGP and the vertical portion VP of the cover bottom CB. can be intervened in either. A side surface of the light guide plate LGP facing the light source LS may be defined as a light incident surface. The light guide plate LGP receives light from the light source LS through a light incident surface facing the light source LS.

The light incident surface of the light guide plate LGP needs to be spaced apart from the light source LS by a predetermined distance G in order to prevent collision with the light source LS and thermal damage due to high-temperature heat generated from the light source LS. There is, and it is necessary to maintain the predetermined interval (G). The distance G between the light incident surface of the light guide plate LGP and the light source LS may be appropriately selected in consideration of heat dissipation design of the light source LS and light loss from the light source LS.

In order to maintain the distance G between the light incident surface of the light guide plate LGP and the light source LS, first concave portions IP1 and second concave portions IP2 are provided on both left and right sides of the cover bottom CB. ) are formed, respectively, and a first concave groove FP1 and a second concave groove FP2 are formed on both left and right sides of the light guide plate LGP, respectively.

The first concave portion FP1 may be matched to the first concave portion IP1. The second concave portion FP2 may be matched to the second concave portion IP2. The first concave portion IP1 and the second concave portion IP2 may have a planar shape of any one of a rectangle, a square, and a trapezoid. The first groove FP1 and the second groove FP2 are illustrated as having substantially the same shape and size, but are not limited thereto. The first concave portion FP1 and the second concave portion FP2 may have shapes corresponding to the first concave portion IP1 and the second concave portion IP2 , respectively.

Between the first concave portion IP1 and the first concave groove FP1, a first buffer member RP1 is interposed. Since the first buffer member RP1 has a predetermined elasticity, it can be inserted between the first concave portion IP1 and the first concave portion FP1 in a compressed state. The first buffering member RP1 may be fitted and coupled between the first concave portion IP1 and the first concave portion FP1. The first buffering member RP1 may include any one of silicon and rubber, but is not limited thereto.

Between the second concave portion IP2 and the second concave groove FP2, a second buffer member RP2 is interposed. Since the second buffer member RP2 has a predetermined elasticity, it can be inserted between the second concave portion IP2 and the second concave portion FP2 in a compressed state. The second buffer member RP2 may be fitted between the second concave portion IP2 and the second concave groove FP2. The second buffering member RP2 may include any one of silicon and rubber, but is not limited thereto.

More specifically, the first concave portion IP1 and the second concave portion IP2 of the cover bottom CB have a shape in which the vertical portion VP of the cover bottom CB is partially drawn inward. Accordingly, the distance G2 between the vertical portion VP of the cover bottom CB and the second body B2 of the case top CT in the region where the first concave portion IP1 is provided is the first concave portion IP1 In the area where is not provided, the distance G1 between the vertical portion VP of the cover bottom CB and the second body B2 of the case top CT is wider than the distance G1. Further, the distance G2 between the vertical portion VP of the cover bottom CB and the second body B2 of the case top CT in the region where the second concave portion IP2 is provided is the second concave portion IP2 In the area where is not provided, the distance G1 between the vertical portion VP of the cover bottom CB and the second body B2 of the case top CT is wider than the distance G1. The first concave portion IP1 may be symmetrical with respect to a virtual reference line crossing the center of the second concave portion IP2 and the cover bottom CB in the vertical direction.

The first concave portion IP1 includes an upper stepped portion SU1 and a lower stepped portion SL1. The second concave portion IP2 includes an upper stepped portion SU2 and a lower stepped portion SL2. The first buffering member RP1 and the second buffering member RP2 are disposed on the left and right sides of the cover bottom CB, respectively, and may be vertically asymmetrically disposed.

For example, the first buffer member RP1 is interposed between the upper stepped portion SU1 of the first concave portion IP1 and the first concave portion FP1, and the second buffer member RP2 is disposed in the second concave portion IP2. It may be interposed between the lower stepped portion SL2 and the second groove FP2. At this time, the lower stepped portion SL1 of the first concave portion IP1 is inserted into the first concave groove FP1 and directly contacts the side surface of the light guide plate LGP. The lower stepped portion SL1 of the first concave portion IP1 that directly contacts the light guide plate LGP may be referred to as a light guide plate LGP support area. In addition, the upper stepped portion SU2 of the second concave portion IP2 is inserted into the second concave groove FP2 and directly contacts the side surface of the light guide plate LGP. The upper step portion SU2 of the second concave portion IP2 in contact with the light guide plate LGP may be referred to as a light guide plate LGP support area.

As another example, the first buffer member RP1 is interposed between the lower stepped portion SL1 of the first concave portion IP1 and the first concave portion FP1, and the second buffer member RP2 is disposed on the second concave portion IP2. It may be interposed between the upper step portion SU2 and the second groove FP2. At this time, the upper stepped portion SU1 of the first concave portion IP1 is inserted into the first concave groove FP1 and directly contacts the side surface of the light guide plate LGP. The upper step portion SU1 of the first concave portion IP1 directly contacting the light guide plate LGP may be referred to as a light guide plate LGP support area. In addition, the lower stepped portion SL2 of the second concave portion IP2 is inserted into the second concave groove FP2 and directly contacts the side surface of the light guide plate LGP. The lower stepped portion SL2 of the second concave portion IP2 in contact with the light guide plate LGP may be referred to as a light guide plate LGP support area.

Hereinafter, for convenience of explanation, the first buffer member RP1 is provided between the upper step portion SU1 of the first concave portion IP1 and the first concave portion FP1, and the second buffer member RP2 is A case provided between the lower step portion SL2 of the second concave portion IP2 and the second concave portion FP2 will be described as an example.

6 is an enlarged view of the upper stepped portion SU1 of the first concave portion IP1 and the lower stepped portion SL2 of the second concave portion IP2.

Referring further to FIG. 6 , the upper stepped portion SU1 of the first concave portion IP1 has a first surface P1, a second surface P2 located inside the first surface P1, and the first surface P1. A third surface P3 connecting P1 and the second surface P2 is included. A hot angle α between the second surface P2 and the third surface P3 is a right angle or an obtuse angle. It is preferable that the hot angle α between the second surface P2 and the third surface P3 is 90°<α<150°. The first buffering member RP1 may be interposed between the third surface P3 constituting the upper stepped portion SU1 of the first concave portion IP1 and the first concave portion FP1 in a compressed state (FIG. 6 of (a)).

The lower stepped portion SL2 of the second concave portion IP2 has a first surface P1, a second surface P2 located inside the first surface P1, and a second surface between the first surface P1 and the second surface P1. It includes a third surface (P3) connecting (P2). A hot angle β between the second surface P2 and the third surface P3 is a right angle or an obtuse angle. It is preferable that the hot angle β between the second surface P2 and the third surface P3 is 90°<β<150°. The second buffering member RP2 may be interposed between the third surface P3 constituting the lower stepped portion SL2 of the second concave portion IP2 and the second concave portion FP2 in a compressed state (FIG. 6 of (b)).

The present invention relates to a first buffer member RP1 and a second buffer member RP2 fitted and coupled in a compressed state between the vertical portion VP of the cover bottom CB and the light guide plate LGP, and the cover bottom CB The movement of the light guide plate LGP in the internal space provided in the cover bottom CB can be restrained and restricted by a combination of the vertical portion VP of the ) and the light guide plate LGP support area in direct contact with . That is, by the combination of the above structures, the present invention, when expansion, contraction, or displacement occurs in the light guide plate LGP due to external factors such as temperature change, humidity change, external shock, or vibration, the light guide plate LGP Positional change can be suppressed. Accordingly, the present invention can prevent damage to the light guide plate (LGP) or generation of noise and deterioration of optical characteristics due to mutual interference between the light guide plate (LGP) and other structures, thereby improving product stability and reliability. This improved liquid crystal display device can be provided.

7 is an enlarged view of the first concave portion FP1 and the first concave portion IP1 that are combined.

Referring further to FIG. 7 , when the thermal angle α formed by the second and third surfaces P2 and P3 is a right angle, movement of the light guide plate LGP in the vertical direction is prevented and the light guide plate LGP and Although it is possible to maintain the separation distance from the light source LS, it may be difficult to prevent the flow of the light guide plate LGP in the left and right directions (FIG. 7(a)).

When the hot angle α formed by the second surface P2 and the third surface P3 is an obtuse angle, flow of the light guide plate LGP in the vertical direction as well as in the left and right directions may be prevented. Therefore, it may be preferable that the hot angle α formed by the second surface P2 and the third surface P3 is an obtuse angle, for example, in the range of 120°<α<150° (FIG. 7(b)) .

In the above description, the case where the concave portion FP that can be matched with the concave portion IP of the cover bottom CB is formed only in the light guide plate LGP has been described as an example, but is not limited thereto. For example, first concave grooves and second concave grooves may be formed on both left and right side surfaces of the at least one optical sheet OPS, and the first concave groove and the second concave groove may be formed in the first concave portion IP1 of the cover bottom CB, respectively. ) and the second concave portion IP2 (FIG. 1).

The first buffer member RP1 extends between the first concave portion IP1 and the first concave portion of the optical sheet OPS, and is compressed between the first concave portion IP1 and the first concave portion of the optical sheet OPS. It can be fitted into the state. The second buffer member RP2 extends between the second concave portion IP2 and the second concave portion of the optical sheet OPS, and is compressed between the second concave portion IP2 and the second concave portion of the optical sheet OPS. It can be fitted into the state.

Accordingly, the present invention suppresses the positional change of the optical sheets OPS when expansion, contraction, or displacement occurs in the optical sheets OPS due to external factors such as temperature change, humidity change, external shock, or vibration. can do. Accordingly, the present invention can prevent the optical sheets (OPS) from being damaged and the optical properties from being deteriorated due to mutual interference between the optical sheets (OPS) and other structures, thereby improving product stability and reliability. A liquid crystal display device may be provided.

The guide panel GP that surrounds the vertical portion VP of the cover bottom CB from the outside may include a first groove and a second groove. The first and second concave grooves of the guide panel GP may be formed to have corresponding shapes at positions corresponding to the first and second concave grooves FP1 and FP2 of the light guide plate LGP, respectively. Accordingly, the first concave groove and the second concave groove of the guide panel GP may be matched to the first concave portion IP1 and the second concave portion IP2 of the cover bottom CB, respectively (FIG. 1). Accordingly, the present invention has an advantage in that the structures constituting the backlight unit and the casing members assembled therewith can be firmly fixed.

<Example>

Hereinafter, a liquid crystal display device according to an exemplary embodiment of the present invention will be described with reference to FIGS. 8 and 9 . 8 is a plan view schematically illustrating a liquid crystal display according to an exemplary embodiment of the present invention. 9 is a cross-sectional view of FIG. 8 taken along line III-III'.

Referring to FIGS. 8 and 9 , the light source LS and the light guide plate LGP are positioned in the inner space provided by the cover bottom CB. The light source LS may be disposed opposite to at least one of upper and lower surfaces of the light guide plate LGP. A first concave portion IP1 and a second concave portion IP2 are formed on both left and right sides of the cover bottom CB, respectively, and a first concave portion FP1 and a second concave portion FP2 are formed on both left and right sides of the light guide plate LGP. each is formed. The first concave portion FP1 may be matched to the first concave portion IP1. The second concave portion FP2 may be matched to the second concave portion IP2.

The guide panel GP is provided between the liquid crystal display panel PNL and the optical sheet OPS, and supports an edge of the liquid crystal display panel PNL from its rear surface. The guide panel GP may extend to surround the vertical portion VP of the cover bottom CB from the outside. The first body B1 of the case top CT surrounds the front edge of the liquid crystal display panel PNL, and the second body B2 covers the vertical portion VP and the guide panel GP of the cover bottom CB. It is provided to wrap from the outside.

At least one burring tap (BT) is formed in the second body B2 of the case top CT. The burring tab BT includes a hollow into which the screw SCR can be fastened. The burring tab BT may be formed during molding of the case top CT. The present invention has an advantage in that the case top CT can be fastened to at least one of the casing members by the screw SCR without using a separate nut by using the burring tab BT. The casing member may be any one of a cover bottom CB, a guide panel GP, and an external system.

The burring tab BT is formed to protrude from the second body B2 of the case top CT toward the vertical portion VP of the cover bottom CB. The burring tab BT is formed to overlap at least one of the first concave portion IP1 and the second concave portion IP2. As described above, in the area where the first recessed portion IP1 and the second recessed portion IP2 are formed, the distance G2 between the vertical portion VP and the second body B2 is wider than other areas. Therefore, according to the present invention, a sufficient space for forming the burring tab BT can be secured by utilizing the area where the first concave portion IP1 and the second concave portion IP2 are formed. Since the present invention does not need to secure a separate space for the burring tab BT, there is an advantage in that it is easy to implement a narrow bezel.

Through the above description, those skilled in the art will be able to make various changes and modifications without departing from the spirit of the present invention. Therefore, the technical scope of the present invention is not 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
OPS: optical sheet LGP: light guide plate
LS: light source CB: cover bottom
VP: vertical part HP: horizontal part
IP: recess FP: recess
SU: Upper stepped part SL: Lower stepped part
RP: buffer member

Claims (10)

liquid crystal display panel;
a light guide plate disposed on the rear surface of the liquid crystal display panel to transmit incident light from a light source to the front surface, and having first and second concave grooves respectively provided on opposite left and right side surfaces;
a cover bottom having a horizontal portion surrounding the rear surface of the light guide plate, and a vertical portion extending from the horizontal portion and having a first concave portion conforming to the first concave portion and a second concave portion conforming to the second concave portion;
a first buffer member provided between the first concave portion and the first concave groove;
a case top having a first body surrounding the front edge of the liquid crystal display panel and a second body extending from the first body and surrounding the vertical portion from the outside; and
And a second buffer member provided between the second recess and the first recess,
The second body includes at least one burring tab that protrudes toward the vertical portion and overlaps with at least one of the first concave portion and the second concave portion. According to claim 1,
Each of the first recess and the second recess,
Including an upper step and a lower step,
The first buffer member,
It is provided between the upper step of the first recess and the first recess,
The second buffer member,
A liquid crystal display device provided between the lower step portion of the second concave portion and the second concave groove. According to claim 2,
The upper step of the first concave portion,
first side;
a second surface positioned inside the first surface;
A third surface connecting the first surface and the second surface,
A hot angle formed by the second surface and the third surface is a right angle or an obtuse angle,
The first buffer member,
A liquid crystal display device provided between the third surface and the first concave groove. According to claim 2,
The lower step of the second concave portion,
first side;
a second surface positioned inside the first surface;
A third surface connecting the first surface and the second surface,
A hot angle formed by the second surface and the third surface is a right angle or an obtuse angle,
The second buffer member,
A liquid crystal display device provided between the third surface and the second concave groove. According to claim 1,
The first groove,
It has a shape corresponding to the first concave portion,
The second groove,
A liquid crystal display device having a shape corresponding to the second concave portion. According to claim 1,
The light source,
A liquid crystal display disposed opposite to at least one of upper and lower sides of the light guide plate. According to claim 1,
The first main part,
A liquid crystal display device that is symmetric with respect to a reference line crossing the center of the second concave portion and the cover bottom in a vertical direction. According to claim 1,
At least one of the first recess and the second recess,
A liquid crystal display device having a planar shape of any one of a rectangle, a square, and a trapezoid. According to claim 1,
Further comprising at least one optical sheet interposed between the liquid crystal display panel and the light guide plate,
The optical sheet,
a first groove that is molded into the first recess; and
Including a second groove that is molded to the second recess,
The first buffer member,
It extends between the first concave portion and the first concave groove of the optical sheet,
The second buffer member,
A liquid crystal display device extending between the second concave portion and the second concave groove of the optical sheet. delete

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