KR101420521B1 - Liquid Crystal Display Device - Google Patents

Abstract

A liquid crystal display device according to an embodiment includes: a liquid crystal display panel including a thin film transistor substrate and a color filter substrate; A backlight unit for supplying light to the liquid crystal display panel; A bottom cover for supporting the backlight unit; And a reinforcing bar fastened to the bottom cover and having a constant curvature.

Description

[0001] The present invention relates to a liquid crystal display device,

The embodiment relates to a liquid crystal display device.

As the information society develops, the demand for display devices for displaying images is increasing in various forms. A flat panel display device including a thin liquid crystal display (LCD), a plasma display (PDP) or an organic electroluminescent device (OLED) which is thinner and lighter than a conventional cathode ray tube display (CRT) has been actively researched and commercialized . Of these, liquid crystal display devices are widely used today because of their advantages of miniaturization, light weight, thinness, and low power driving.

The liquid crystal display device is generally formed in a flat plate shape, so that the distance from the main viewing area to the central area and the distance from the main viewing area to the both side areas are different from each other.

The embodiment provides a liquid crystal display device including a reinforcing bar capable of maintaining a curvature in the configuration of a liquid crystal display device.

The embodiment provides a liquid crystal display device capable of preventing a stain phenomenon caused by lifting of a light guide plate.

A liquid crystal display device according to an embodiment includes: a liquid crystal display panel including a thin film transistor substrate and a color filter substrate; A backlight unit for supplying light to the liquid crystal display panel; A bottom cover for supporting the backlight unit; And a reinforcing bar fastened to the bottom cover and having a constant curvature.

The liquid crystal display according to the embodiment can maintain the curvature by fixing the bottom cover and the light guide plate to the reinforcing bar having curvature.

The liquid crystal display device according to the embodiment of the present invention closely fixes the light guide plate to the bottom cover through the fixing member to prevent a stain phenomenon that may be caused by two different curvatures, thereby improving image quality.

1 is an exploded perspective view showing a liquid crystal display device according to an embodiment.
2 is a view showing a reinforcing bar of the liquid crystal display device according to the embodiment.
3 is a view showing a bottom cover of a liquid crystal display device according to an embodiment.
4 is a cross-sectional view of a liquid crystal display device according to an embodiment.
5 is a view showing a reinforcing bar according to an embodiment and a fastening structure of a light guide plate and an optical sheet.
FIG. 6 is a cross-sectional view of the liquid crystal display of FIG. 5 cut along C-C '. FIG.

A liquid crystal display device according to an embodiment includes: a liquid crystal display panel including a thin film transistor substrate and a color filter substrate; A backlight unit for supplying light to the liquid crystal display panel; A bottom cover for supporting the backlight unit; And a reinforcing bar fastened to the bottom cover and having a constant curvature.

And a top cover for protecting a front edge region of the liquid crystal display panel. The top cover may have the same curvature as the reinforcing bar.

Wherein the reinforcing bar comprises: a plurality of horizontal reinforcing bars having the predetermined curvature; A plurality of vertical reinforcing bars which are crossed with the horizontal reinforcing bars and are formed in a planar shape; And a side reinforcement bar formed on the outermost side of the horizontal reinforcement bar.

The vertical reinforcing bar includes: a vertical plane portion; And a vertical groove portion formed in a shape recessed in a region intersecting the horizontal reinforcing bar.

The horizontal reinforcing bar is housed in the vertical groove portion and can be fastened by the fastening portion.

The backlight unit includes: a light source for generating and irradiating light; A light guide plate formed on a side surface of the light source and converting light from the light source into a surface light source; An optical sheet formed on an upper surface of the light guide plate to condense and diffuse light; And a housing for protecting the light source, wherein the light guide plate, the optical sheet and the housing can be fixed by the reinforcing bar.

Wherein the side reinforcing bar comprises: a side surface horizontal portion having a flat upper surface; A side protruding portion protruding from the side horizontal portion; And a side groove portion recessed from the side horizontal portion.

A sheet nip portion protruded from the optical sheet may be formed on a side surface of the optical sheet, and the sheet nip portion may be joined to the side surface projection portion.

And a fixing member located in a region corresponding to the side groove portion, wherein the fixing member can be fixedly attached to the bottom cover by the light guide plate.

The cover may further include a cover protrusion protruding from the upper surface of the bottom cover, and the fixing member and the cover protrusion may be fastened by the fastening member.

The fixing member may be in the shape of a letter.

Wherein the bottom cover comprises: a central portion of a central region; And a wing portion formed on both side surfaces of the center portion and having a stepped portion with respect to the center portion, and the wing portion may have a receiving groove exposing a part of the horizontal reinforcing bar.

The lower surface of the housing may be formed in a shape corresponding to the wing portion and the horizontal reinforcement bar and may be fixed to the bottom cover and the reinforcement bar.

The horizontal reinforcement bar and the side reinforcement bar may be integrally formed.

1 is an exploded perspective view showing a liquid crystal display device according to an embodiment.

Referring to FIG. 1, a liquid crystal display device according to an embodiment includes a liquid crystal display panel 10 for displaying an image and a backlight unit 50 for supplying light to the liquid crystal display panel 10.

The liquid crystal display panel 10 includes a thin film transistor substrate 11, a color filter substrate 13, and a liquid crystal layer (not shown) interposed between the two substrates so as to face each other and maintain a uniform cell gap .

A plurality of gate lines and data lines are formed on the thin film transistor substrate 11, and pixel regions at the intersections of the gate lines and the data lines are defined. The gate line and the data line are electrically connected to the thin film transistor, and the thin film transistor is electrically connected to the pixel electrode in the pixel region.

The color filter substrate 13 is provided with color filters of red (R), green (G) and blue (B) in a region corresponding to the pixel region of the thin film transistor substrate 11, A black matrix capable of preventing light leakage is provided in a region corresponding to the gate line, the data line, and the thin film transistor.

In addition, a common electrode may be formed on the surface of the color filter substrate 13 on which the thin film transistor substrate 11 faces.

An electric field is generated by the voltage difference applied to the pixel electrode and the common electrode, and the liquid crystal layer (not shown) is displaced by the electric field to adjust the light transmittance to display an image.

A top case 1 for protecting the liquid crystal display panel 10 may be disposed on a front surface of the liquid crystal display panel 10. The top case 1 may be formed in a rectangular frame shape to correspond to a front outer area of the liquid crystal display panel 10. The top case 1 may be formed in a curved shape having a constant curvature.

The top case 1 may be formed by a roll forming process or a curved surface pressing process in which a sheet material is passed between a plurality of rolls to form the sheet material.

The curved surface pressing process may be performed by forming a vertical surface protecting the side surface of the liquid crystal display panel 10 by applying a pressure to a plate material cut to have a curved surface by using a metal mold and machining the cut surface using a laser.

A rectangular panel-shaped guide panel 40 for supporting the liquid crystal display panel 10 is disposed on the lower surface of the liquid crystal display panel 10. The guide panel 40 may support a lower outer area of the liquid crystal display panel 10.

A bottom cover 20 for supporting the backlight unit 50 may be formed on a lower surface of the backlight unit 50. The bottom cover 20 is formed in a plate shape

A reinforcing bar (30) may be formed on the bottom surface of the bottom cover (20). The reinforcing bar 30 may be formed in a curved shape having a predetermined curvature.

The bottom cover 30 can maintain a curved shape through the curved shape of the reinforcing bar 30. [ The bottom cover 20 may be coupled to the reinforcing bar 30 to maintain a curved shape.

The bottom cover 20 is formed in a plate shape without a side wall, and can prevent wrinkles or cracks even if the bottom cover 20 has a constant curvature.

The backlight unit 50 may include an optical sheet 60, a light guide plate 61, a reflection sheet 63, a housing 70, and a light source 80.

The light source 80 may provide light to the light guide plate 61. The light source 80 may be formed on both sides of the light guide plate 61.

The light source 80 may be seated in the housing 70. The housing 70 surrounds the light source 80 from an external impact and dissipates heat generated from the light source 80 to the outside.

A housing groove portion 71 and a housing flat portion 73 may be formed on the lower surface of the housing 70. The housing groove portion 71 may have a depressed shape with respect to the lower surface of the housing flat portion 73.

The housing groove portion 71 may be formed in a region corresponding to the reinforcing bar 30 so that the reinforcing bar 30 can be received in the housing groove portion 71. The reinforcing bars 30 are accommodated in the housing grooves 71 so that the housing 70 can be fixed to the reinforcing bar 30.

The light guide plate 61 is formed between the light sources 80 to convert the light from the light source 80 into surface light and guide the light to the liquid crystal display panel 10. The light guide plate 61 may be formed of a transparent material to minimize the loss of incident light.

The light guide plate 61 may include a pattern of a specific shape in order to supply a uniform surface light. The light guide plate 61 may be formed of PMMA (poly methylmethacrylate), PC (polycarbonate), acrylic, or silicon.

A reflective sheet 63 may be formed between the light guide plate 61 and the bottom cover 20. The reflective sheet 63 may include a printed pattern or a concavo-convex pattern.

The light incident from the light source 80 into the light guide plate 61 is scattered or reflected by the reflection plate 63 and the light incident on the light guide plate 61 at an angle exceeding a certain critical angle passes through the light guide plate 61, As shown in FIG.

An optical sheet 60 may be formed between the light guide plate 61 and the liquid crystal display panel 10. The optical sheet 60 may include a plurality of prism sheets and a diffusion sheet. The optical sheet 60 may serve to diffuse and condense light from the light guide plate 61. [

5A and 6, since the light guide plate 61 is formed in a flat plate shape, it may be fixed to the curved reinforcement bar 30 to form the curved liquid crystal display device. The light guide plate 61 may be fixed to the reinforcing bar 30 through a fixing member 90.

The fixing member 90 may be formed to have a L-shape. The light guide plate 61 may be fixed to the curved reinforcement bar 30 through the fixing member 90 and may have a constant curvature.

The liquid crystal display panel 10 and the backlight unit 50 are formed in a flat plate shape so that the top case 1 and the reinforcing bar 30 are formed in a curved shape, The unit 50 can be fixed to the top case 1 and the reinforcing bars 30 to maintain the liquid crystal display device in a curved shape.

2 is a view showing a reinforcing bar of the liquid crystal display device according to the embodiment.

The reinforcing bars 30 shown in FIG. 2A may include a plurality of horizontal reinforcing bars 31 of FIG. 2B, a plurality of vertical reinforcing bars 33 of FIG. 2C, and side reinforcing bars 37 of FIG. 2D.

As shown in FIG. 2B, the plurality of horizontal reinforcing bars 31 may be arranged to cross the plurality of vertical reinforcing bars 33. The horizontal reinforcing bar 31 may be formed in a curved shape having a predetermined curvature, and the vertical reinforcing bar 33 may be formed in a planar shape.

The plurality of horizontal reinforcing bars (31) can be crossed with the plurality of vertical reinforcing bars (33). Through holes 37 may be formed through the plurality of horizontal reinforcing bars 31. The through hole 37 may be formed in a region where the horizontal reinforcing bar 31 and the vertical reinforcing bar 33 intersect.

The plurality of horizontal reinforcing bars 31 can be fastened to the plurality of vertical reinforcing bars 33 through fastening portions 35. The fastening portion 35 may be formed in a region where the horizontal reinforcing bar 31 and the vertical reinforcing bar 33 intersect.

As shown in FIG. 2C, the vertical reinforcing bar 33 may include a vertical plane portion 33a and a vertical groove portion 33b. The vertical grooves 33b may be formed as a depression from the vertical plane portion 33a.

The vertical groove 33b may be formed in a recessed shape for accommodating the horizontal reinforcing bars 31. [ The vertical groove 33b may be formed in a region where the horizontal reinforcing bar 31 and the vertical reinforcing bar 33 intersect. The vertical groove 33b may be recessed by the height of the horizontal reinforcing bar 31. [

A coupling hole 38 may be formed in the vertical groove 33b. The coupling hole 38 may be formed at a position corresponding to the through hole 37. The vertical groove portion 33b and the horizontal reinforcing bar 31 may be fastened through the fastening portion 35. [

The fastening part 35 passes through the through hole 37 and is coupled to the coupling hole 38 to firmly fasten the horizontal reinforcing bar 31 and the vertical reinforcing bar 33. The reinforcing bar 30 may have a flat shape without the protruding area because the horizontal reinforcing bar 31 is housed in the vertical groove portion 33b.

The upper surface of the reinforcing bar 30 has a flat shape so that the reinforcing bar 30 can be in surface contact with the bottom cover 20. [

As shown in FIG. 2d, lateral reinforcing bars 37 may be formed on outer surfaces of the horizontal reinforcing bars 31 located outside the plurality of horizontal reinforcing bars 31. In other words, the side reinforcing bar 37 may be formed on the outer side of the outermost horizontal reinforcing bar 31.

The side reinforcement bars 37 may have the same curvature as that of the horizontal reinforcement bars 31. The side reinforcement bars 37 may be integrally formed with the horizontal reinforcement bars 31 and the side reinforcement bars 37 may be separately formed and attached to the horizontal reinforcement bars 31 .

The side reinforcing bar 37 may protrude from the upper surface of the horizontal reinforcing bar 31. The side reinforcing bar 37 can fix the side surface of the bottom cover 20. [

The side reinforcement bar 37 may include a side horizontal portion 37a, a side groove portion 37b, and a side projecting portion 37c. The side groove 37b may be formed to be recessed in the vertical direction from the side horizontal portion 37a and the side projection 37c may be formed to protrude in the vertical direction from the side horizontal portion 37a. have.

3 is a view showing a bottom cover of a liquid crystal display device according to an embodiment.

Referring to FIG. 3, the bottom cover 20 of the liquid crystal display according to the embodiment may include a central portion 21 and a wing portion 23.

The wing portion 23 may be formed on both sides of the center portion 21 and may be formed parallel to the center portion 21. [ The area connecting the central part 21 and the wing part 23 is inclined so that the wing part 23 can be formed to descend from the central part 21 toward the reinforcing bar. The central portion 21 and the wing portion 23 may be integrally formed.

In the wing portion 23, a receiving groove 24 may be formed in a region corresponding to the horizontal reinforcing bar 31. The receiving groove 24 may be formed to be openable to accommodate the horizontal reinforcing bar 31. The horizontal reinforcing bars 31 are received through the receiving grooves 24 and accommodated in the housing grooves 71 to fix the housing 70 to the horizontal reinforcing bars 31.

A plurality of cover holes 25 may be formed in a region of the central portion 21 corresponding to the horizontal reinforcing bars 31. The cover hole 25 may be formed to penetrate through the central portion 21. The central portion 21 and the horizontal reinforcing bar 31 can be fixed by fastening screws to the cover hole 25.

A hole may be formed in the horizontal reinforcing bar 31 in a region corresponding to the cover hole 25. The bottom cover 20 and the reinforcing bar 30 are fixed by fastening the center portion 21 and the horizontal reinforcing bar 31 so that the bottom cover 20 has the same curvature as the reinforcing bar 30 Shape.

A cover projection 27 may be formed on the central portion 21. The cover projection 27 has a shape protruding from the upper surface of the central portion 21, and a cover fastening hole is formed in a central region so that the fastening member can be fastened. The cover protrusion 27 can support the light guide plate 61 in a fixed manner.

4 is a cross-sectional view of a liquid crystal display device according to an embodiment. FIG. 4A is a cross-sectional view of the liquid crystal display of FIG. 1 taken along line A-A ', and FIG. 4B is a cross-sectional view of the liquid crystal display of FIG. 1 taken along line B-B'.

Referring to FIG. 4 together with FIG. 1, the liquid crystal display according to the embodiment includes a liquid crystal display panel 10 and a backlight unit 50.

As shown in FIGS. 4A and 4B, the liquid crystal display panel 10 may include a thin film transistor substrate 11 and a color filter substrate 13. The backlight unit 50 may include an optical sheet 60, a light guide plate 61, a reflection sheet 63, a housing 70, and a light source 80.

 The backlight unit (50) is supported by the bottom cover (20). A reflective sheet 63 is positioned on a central portion 21 of the bottom cover 20 and a housing 70 is positioned on a wing portion 23 of the bottom cover 20. The central portion 21 and the wing portion 23 may have a stepped portion.

The reinforcing bars 30 are attached and fixed to the bottom surface of the bottom cover 20. 4A, the reinforcement bar 30 and the housing 70 are in contact with each other and a region corresponding to the wing portion 23 of the bottom cover 20 is formed in a region corresponding to the wing portion 23 of the bottom cover 20, The wing portion 23 and the housing 70 may be in contact with each other as shown in FIG.

1, a housing groove 71 is formed in the housing 70 in a region corresponding to the reinforcing bar 30 and a housing flat portion 73 is formed in a region corresponding to the wing portion 23, The housing 70 can be tightly fixed by the reinforcing bar 30 and the bottom cover 20.

A light source 80 may be attached to the housing 70. The light source 80 may include a light emitting diode package 81 and a printed circuit board 83. The light emitting diode package 81 is mounted on the printed circuit board 83 and receives a driving current from the printed circuit board 83 to provide light to the light guide plate 61.

Although the light source 80 is configured as a light emitting diode package in the drawing, the light source 80 is not limited thereto and may be a lamp. The lamp may be a cold cathode fluorescent lamp (CCFL) or an external electrode fluorescent lamp (EEFL).

The guide panel 40 may be in contact with the housing 70. The guide panel 40 supports the liquid crystal display panel 10 and the top cover 1 may surround the edge region of the liquid crystal display panel 10.

FIG. 5 is a view showing a reinforcing bar according to an embodiment of the fastening structure of the light guide plate and the optical sheet, and FIG. 6 is a cross-sectional view taken along the line C-C 'of the liquid crystal display of FIG.

FIG. 5A is a top view of a reinforcing bar and a light guide plate and an optical sheet, and FIG. 5B is a side view of the side reinforcing bar.

5 and 6, the reinforcing bar 30 of the liquid crystal display according to the embodiment includes a horizontal reinforcing bar 31 for supporting the bottom surface of the bottom cover 20, And a side reinforcing bar 37 positioned at the side of the side reinforcing bar.

The reflective sheet 63, the light guide plate 61, and the optical sheet 60 may be sequentially positioned on the bottom cover 20 as shown in FIG.

As shown in FIGS. 2d and 5b, the side reinforcement bar 37 may include a side horizontal portion 37a, a side groove portion 37b, and a side projecting portion 37c.

The optical sheet 60 may include a plurality of sheet ear portions 65 projecting outwardly.

As shown in FIGS. 5A and 5B, the sheet ear portion 65 may be formed corresponding to the plurality of side protrusions 37c. The sheet ear portion 65 has a fastening hole and a fastening hole of the sheet ear portion 65 is fastened to the side projecting portion 37c so that the optical sheet 60 can be fixed to the side reinforcing bar 37 have.

As shown in FIG. 3, a plurality of cover projections 27 may be formed on the central portion 21 of the bottom cover 20. The cover protrusion 27 may be formed in a region corresponding to the side groove 37b.

The cover projection 27 has a shape protruding from the upper surface of the central portion 21 and a cover engagement hole 28 may be formed in a central region of the cover projection 27. The cover protrusion 27 may be integrally formed with the bottom cover 20.

The fixing member 90 may be positioned in an area corresponding to the cover projection 27 as shown in FIG. The fixing member 90 may be formed in the shape of a letter and may include a horizontal region and a vertical region. The horizontal region of the fixing member 90 is in contact with the cover projection 27 and the upper surface of the light guide plate 61 and the vertical region of the fixing member 90 is in contact with the outer surface of the side reinforcing bar 37 .

A fixing hole 92 may be formed in a horizontal region of the fixing member 90. The fixing hole 92 may be formed through the horizontal region of the fixing member 90. The fixing hole 92 may be formed in a region corresponding to the cover engagement hole 28.

The fastening member 91 may be fastened to the fixing hole 92 and the cover fastening hole 28. [ The fastening member 91 may be fastened to the fixing hole 92 and the cover body force hole 28 to closely fix the light guide plate 61 to the bottom cover 20.

In other words, the fastening member 91 is fastened to the fixing hole 92 and the cover fastening hole 28, so that the fastening force is transmitted to the fixing member 90 which is in contact with a part of the upper surface of the light guide plate 61.

The light guide plate 61 may be fixed to the bottom cover 20 by fixing force of the fixing member 90 in the direction of the bottom cover 20.

As shown in FIG. 5B, the side groove 37b may have a greater width than the fixing member 90. The side groove portion 37b has a greater width than the fixing member 90 so that the fixing member 90 is moved up and down to fix the light guide plate 61 to the bottom cover 20. [

As a result, it is possible to form the bottom cover 20 in the shape of the curved reinforcing bar 30 and prevent the lifting between the bottom cover 20 and the light guide plate 61, It is possible to prevent image stain that may appear between the bottom cover 20 and the light guide plate 61, and a curved liquid crystal display device can be realized.

In addition, the fastening force between the reinforcing bar 30, the bottom cover 20, the diffusion sheet 60, and the light guide plate 61 is improved to prevent damage due to an external impact.

As a result, it is possible to realize a curved-type liquid crystal display device, which makes it possible to form the same distance from the main viewing area to the central area of the liquid crystal display device and to the both side areas, thereby minimizing the deviation of the distance feeling, have.

1: Top case 10: Liquid crystal display panel
11: thin film transistor substrate 13: color filter substrate
20: bottom cover 21:
23: wing portion 24: storage groove
25: Cover hole 27: Cover projection
30: reinforcing bar 31: horizontal reinforcing bar
33: vertical reinforcing bar 35: fastening part
37: side reinforcement bar 40: guide panel
50: backlight unit 60: optical sheet
61: light guide plate 63: reflective sheet
65: seat crown 70: housing
80: light source 81: light emitting diode
83: printed circuit board 90: fixing member
91: fastening member

Claims (14)

A liquid crystal display panel including a thin film transistor substrate and a color filter substrate;
A backlight unit for supplying light to the liquid crystal display panel;
A bottom cover for supporting the backlight unit; And
And a reinforcing bar fastened to the bottom cover and having a predetermined curvature,
The reinforcing bar
A plurality of horizontal reinforcing bars having the predetermined curvature; And
And a plurality of vertical reinforcing bars fastened to the horizontal reinforcing bars. The method according to claim 1,
Further comprising a top cover for protecting a front edge region of the liquid crystal display panel,
Wherein the top cover has the same curvature as the reinforcing bar. The method according to claim 1,
The reinforcing bar
Further comprising a side reinforcement bar formed on an outermost side of the horizontal reinforcement bar,
Wherein the plurality of vertical reinforcing bars are formed in a planar shape. The method according to claim 1,
Wherein the vertical reinforcing bar comprises:
A vertical plane portion; And
And a vertical groove portion formed to be recessed in a region intersecting the horizontal reinforcing bar. 5. The method of claim 4,
Wherein the horizontal reinforcing bars are housed in the vertical grooves and fastened by fastening portions. The method of claim 3,
The backlight unit includes:
A light source for generating and irradiating light;
A light guide plate formed on a side surface of the light source and converting light from the light source into a surface light source;
An optical sheet formed on an upper surface of the light guide plate to condense and diffuse light; And
And a housing for protecting the light source,
Wherein the light guide plate, the optical sheet, and the housing are fixed to the reinforcing bars. The method according to claim 6,
Wherein the side reinforcing bar comprises:
A horizontal side surface having a flat upper surface;
A side protruding portion protruding from the side horizontal portion; And
And a side groove portion recessed from the side horizontal portion. 8. The method of claim 7,
A sheet ear portion protruded from the optical sheet is formed on a side surface of the optical sheet,
And the sheet nip portion is coupled to the side projection. 8. The method of claim 7,
Further comprising a fixing member located in a region corresponding to the side groove portion,
And the fixing member closely fixes the light guide plate to the bottom cover. 10. The method of claim 9,
Further comprising a cover projection protruding from an upper surface of the bottom cover,
Wherein the fixing member and the cover projection are fastened by a fastening member. 10. The method of claim 9,
Wherein the fixing member is in a pivotal shape. The method of claim 6, wherein
Wherein the bottom cover comprises: a central portion of a central region; And
And a wing portion formed on both sides of the center portion and having a stepped portion with respect to the center portion,
Wherein the wing portion is formed with a receiving groove for exposing a part of the horizontal reinforcing bar. 13. The method of claim 12,
The lower surface of the housing
Wherein the wing portion and the horizontal reinforcing bar are formed in a shape corresponding to the wing portion and fixed to the bottom cover and the reinforcing bar. The method of claim 3,
Wherein the horizontal reinforcement bar and the side reinforcement bar are integrally formed.

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