KR20180049380A - Liquid crystal display device - Google Patents

Abstract

Provided is a liquid crystal display device capable of preventing a case member from being fluctuated due to an external factor such as an external impact or vibration. According to the present invention, the liquid crystal display device includes: a liquid crystal display panel; a backlight unit disposed on the rear surface of the liquid crystal display panel; and a case member having the liquid crystal display panel and the backlight unit accommodated therein. The case member includes a guide panel and a case top. The guide panel includes a panel support part and an extension part. The panel support part is provided between the liquid crystal display panel and the backlight unit to support an edge of the liquid crystal display panel from the bottom. The extension part extends from the panel support part to surround a side surface of the backlight unit. The case top includes a horizontal part and a vertical part. The horizontal part covers a front edge of the liquid crystal display panel. The vertical part extends from the horizontal part to surround the extension part of the guide panel from the outer side. At least one of the extension part and the vertical part includes a forming part protruding between the extending part and the vertical part.

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.

The case members can be moved due to external factors such as external impact, vibration, and the like. The case members can be fastened to each other by using a hook structure, but the movement can not be constrained by the spacing and tolerance between the fastening parts in the formation of the hook hole into which the hook and the hook are inserted, and the position can be moved. That is, due to the above-described spacing and tolerance, the case members can not be fixed in a state where they are mutually combined due to the external environment, and can be spaced apart. As a result, the case members may not be fixed in place and may be detached, and interference may occur between the case members, causing damage and noise.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal display device capable of preventing the flow of a case member which may be caused by an external factor such as an external impact or vibration.

A liquid crystal display device according to the present invention includes a liquid crystal display panel, a backlight unit disposed on the back surface of the liquid crystal display panel, and a case member for accommodating the liquid crystal display panel and the backlight unit therein. The case member includes a guide panel and a case top. The guide panel includes a panel support and an extension. The panel supporting part is provided between the liquid crystal display panel and the backlight unit to support the edge of the liquid crystal display panel from the bottom. The extension extends from the panel support to wrap the side of the backlight unit. The case top includes a horizontal portion and a vertical portion. The horizontal portion surrounds the front edge of the liquid crystal display panel. The vertical portion extends from the horizontal portion and surrounds the extended portion of the guide panel from the outside. At least one of the extension portion and the vertical portion includes a forming portion protruding between the extending portion and the vertical portion.

According to the present invention, the clearance between the case top and the guide panel can be reduced by including the forming section provided in at least one of the case top and the guide panel. Accordingly, the present invention has an advantage of minimizing damage and noise caused by mutual interference between the case top and the guide panel.

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.
Figs. 3 and 4 are diagrams taken along line II-II 'in Fig.
5 is a view for explaining the positional relationship between the hook structure and the forming section.
Figs. 6 to 8 are views for explaining an example of the shape of the forming section. Fig.

The manufacturing method of the liquid crystal display device includes a substrate cleaning process of a liquid crystal display panel, a substrate patterning process, an orientation film forming / rubbing process, a substrate adhering process and a liquid crystal dropping process, a driving circuit mounting process, a backlight unit assembling process, can do.

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 manufacturing method of the liquid crystal display device may further include an inspection step and a repair step. 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.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only 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 cross-sectional view taken along line I-I 'of FIG. Figs. 3 and 4 are diagrams taken along line II-II 'in 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.

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 sheet OPS includes 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 the 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. The optical sheet (OPS) may further include a functional sheet such as a multilayer optical film (MOF; DBEF-D) and a protection film.

Under the light guide plate LGP, a reflection sheet REF for reflecting light incident from the light guide plate LGP and increasing the efficiency of light incident on the liquid crystal display panel PNL may be 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 with a cover bottom (CB) guide panel (GP), a case top (CT), and the like to form a liquid crystal module Can be implemented.

The cover bottom CB can be formed in a "C " shape whose cross section has at least one bend. The cover bottom CB may be disposed so as to surround the side surface and the back surface of the backlight unit. A backlight unit including a light source LS, a light guide plate (LGP), an optical sheet (OPS), and the like is accommodated in the inner space provided by the cover bottom CB.

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.

A cover shield CS may be disposed at one side edge of the cover bottom CB. The cover shield CS may be provided in a region corresponding to a region where the driving circuit, the PCB, and the like are disposed. The cover bottom CB and the cover shield CS may include a material having a high thermal conductivity and high rigidity so as to smoothly discharge the heat from the driving circuit and the PCB 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 may be 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 cover bottom CB from the outside. The extending portion LP extends from one end of the panel supporting portion SP in the backward direction. The extended portion LP may extend from one end of the panel supporting portion SP to the front direction so as to surround the side surface of the liquid crystal display panel PNL from the outside.

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 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 case top (CT) is disposed so as to surround the side surfaces of the guide panel (GP) and the cover bottom (CB). The case top (CT) can be formed in "a " shape with its cross section having at least one bend. The case top (CT) includes a horizontal portion (HP) and a vertical portion (VP). The horizontal portion HP covers the front edge of the liquid crystal display panel PNL. The vertical part VP extends from the horizontal part HP and is arranged to surround the extended part LP of the guide panel GP on the outside of the guide panel GP. The vertical part VP extends from one end of the horizontal part HP toward the back side. The case top (CT) can be made of a metal plate material such as electro galvanized steel sheet (EGI), stainless steel (SUS), galvalume (SGLC), aluminum plated steel plate (aka ALCOSTA), tin plated steel plate (SPTE)

The case members can be moved due to external factors such as external impact, vibration, and the like. To prevent this, the case top (CT) can be fixed to the guide panel GP by a hook fastening method. The extension part LP of the guide panel GP includes a hook HK protruding toward the vertical part VP of the case top CT and the vertical part VP of the case top CT And a hook hole HH into which the hook HK can be inserted.

However, even if the case top CT and the guide panel GP are fastened to each other by using the hook structure, the hooks HK and HK may not be fastened to each other, Due to the spacing and tolerance, mutual motion can not be constrained and its position can flow.

For example, between the vertical part VP of the case top CT and the extension part LP of the guide panel GP and / or between the hook HK and the hook hole HH, And the spacing space according to the skill value of the process equipment necessarily occurs. Therefore, the case column CT and the guide panel GP can be spaced apart from each other due to the external environment due to the above-described spacing and tolerance.

In this case, problems may occur that the case top (CT) and the guide panel (GP) are not fixed at the predetermined positions and may be separated from each other, and interference may occur between them, causing damage and noise. In addition, since the case top CT and the guide panel GP are not firmly fastened to each other, mutual interference may occur between the liquid crystal display panel accommodated in the case top CT and the guide panel GP and the backlight unit.

3, the present invention includes forming sections CF and GF provided in at least one of a guide panel GP and a case column CT to solve the above-described problems. The forming units CF and GF may include at least one of a first forming unit GF and a second forming unit CF.

The first forming part GF is provided in the extended part LP of the guide panel GP and protrudes toward the vertical part VP of the case top CT. The first forming section GF is disposed adjacent to the vertical section VP of the case column CT in the X axis direction so that the extension section LP of the guide panel GP and the vertical section The spacing G1 between the electrodes VP is reduced. Accordingly, the present invention has an advantage of preventing damages and noise from being caused by mutual interference by reducing the clearance between the guide panel GP and the case top (CT) (FIG. 3 (a)).

The second forming portion CF is provided at the vertical portion VP of the case column CT and protrudes toward the extended portion LP of the guide panel GP. The second forming section CF is disposed adjacent to the extension section LP of the guide panel GP in the X axis direction so that the extension section LP of the guide panel GP and the vertical section The spacing G1 between the electrodes VP is reduced. Accordingly, the present invention has the advantage of preventing damages and noise from being caused by mutual interference by reducing the clearance between the guide panel GP and the case column CT (Fig. 3 (b)).

4, the liquid crystal display according to an embodiment of the present invention may include both the first forming unit GF and the second forming unit CF. The first forming portion GF and the second forming portion CF are staggered. The first forming portion GF and the second forming portion CF protruding in mutually opposite directions may be staggered and engaged with each other.

The first forming section GF and the second forming section CF are arranged so as to be offset from each other, and are disposed adjacent to each other in the Z-axis direction. It is preferable that the first forming section GF and the second forming section CF are provided so as to have a minimum separation gap G2 in the Z-axis direction.

The movement of the case column CT and the guide panel GP in the second direction can be limited and constrained as the first forming section GF and the second forming section CF are arranged adjacent to each other in the Z axis direction have. That is, one embodiment of the present invention minimizes the clearance that may occur as the gap between the hook HK and the hook hole HH is inevitably spaced by the tolerance in forming the hook structure and the skill value of the process equipment . One embodiment of the present invention has an advantage that the occurrence of damage and noise due to mutual interference can be minimized by reducing the clearance between the guide panel (GP) and the case top (CT).

5 is a view for explaining the positional relationship between the hook structure and the forming section.

Referring to Fig. 5, the hook structure and the forming sections CF and GF may be provided on at least one of the four edges of the case top CT (and the guide panel GP). Although not shown, one side edge of the case column CT can be fixed through the guide panel GP and the adhesive member.

The case top CT (and the guide panel GP) may include a first section HP having a hook structure and a second section FP having forming sections CF and GF. The first section HP and the second section FP are formed on at least one edge of the case column CT (and the guide panel GP) for firm connection between the case column CT and the guide panel GP It may be desirable to arrange them alternately with each other. However, the positions and the numbers of the first section HP and the second section FP are not limited to those shown in the drawings.

Figs. 6 to 8 are views for explaining an example of the shape of the forming section. Fig.

Referring to FIG. 6, the first forming unit GF and the second forming unit CF may be provided in a point shape. According to the present invention, the formation portions CF and GF can be easily formed by forming the forming portions CF and GF in a point shape. That is, when the forming sections CF and GF are formed in the shape of a point, the depth of the forming sections CF and GF can be easily controlled at the time of molding and the forming sections CF and CF having various planar shapes, GF) may be easily implemented. Further, since the area occupied by the forming sections CF and GF is narrow, there is an advantage that there is little space restriction for forming the forming sections CF and GF.

Referring to FIG. 7, the first forming unit GF and the second forming unit CF may be provided in a linear shape extending in one direction (X axis direction or Y axis direction). When forming the forming sections CF and GF linearly, since the area occupied by the forming sections CF and GF is wide, it is easy to constrain the motion between the case top CT and the guide panel GP. For example, in the case of including the first forming portion GF and the second forming portion CF of a point shape, since the area occupied by each of the forming portions CF and GF is narrow, it is difficult to align and the movement in the Z- However, in the case where the linear forming portion GF and the second forming portion CF are provided, the forming portions CF and GF may be formed to have a sufficient area to facilitate alignment have.

Referring to FIG. 8, at least one of the first forming unit GF and the second forming unit CF may be provided in a point shape, and the other may be provided in a linear shape. In this case, there is an advantage that both of the advantages of the point-shaped forming sections CF and GF and the linear forming sections CF and GF can be accommodated.

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
CT: Case Top HP: Horizontal
VP: vertical part GF: first forming part
CF: second forming section

Claims (7)

A liquid crystal display device comprising a liquid crystal display panel, a backlight unit disposed on a rear surface of the liquid crystal display panel, and a case member accommodating the liquid crystal display panel and the backlight unit therein,
The case member
A panel support unit provided between the liquid crystal display panel and the backlight unit to support the edge of the liquid crystal display panel from below, and an extension unit extending from the panel support unit to extend the side of the backlight unit; And
And a case top having a horizontal portion surrounding a front edge of the liquid crystal display panel and a vertical portion extending from the horizontal portion and surrounding the extended portion of the guide panel from outside,
At least one of the extending portion
And a forming part protruding between the extending part and the vertical part. The method according to claim 1,
Wherein the forming unit comprises:
And has a linear shape extending in one direction. The method according to claim 1,
Wherein the forming unit comprises:
A liquid crystal display device having a dot shape. The method according to claim 1,
Wherein the forming unit comprises:
A first forming portion protruding from the extending portion toward the vertical portion; And
And a second forming portion protruding from the vertical portion toward the extending portion,
Wherein the first forming unit and the second forming unit comprise:
The liquid crystal display device comprising: 5. The method of claim 4,
Wherein one of the first forming portion and the second forming portion comprises:
Having a linear shape extending in one direction,
Wherein the other of the first forming portion and the second forming portion comprises:
A liquid crystal display device having a dot shape. The method according to claim 1,
Wherein the extension portion and the vertical portion are formed,
And the liquid crystal display device is fastened with a hook structure. The method according to claim 6,
The case member
A first section having the hook structure; And
And a second section having the forming section,
Wherein the first section and the second section are alternately arranged.

Images