KR20170079277A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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Publication number
KR20170079277A
KR20170079277A KR1020150189664A KR20150189664A KR20170079277A KR 20170079277 A KR20170079277 A KR 20170079277A KR 1020150189664 A KR1020150189664 A KR 1020150189664A KR 20150189664 A KR20150189664 A KR 20150189664A KR 20170079277 A KR20170079277 A KR 20170079277A
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KR
South Korea
Prior art keywords
liquid crystal
crystal display
guide panel
middle frame
display panel
Prior art date
Application number
KR1020150189664A
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Korean (ko)
Inventor
김창렴
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020150189664A priority Critical patent/KR20170079277A/en
Publication of KR20170079277A publication Critical patent/KR20170079277A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The present invention relates to a liquid crystal display device capable of reducing the possibility of breakage of a pad portion of a liquid crystal display panel due to an external impact. The liquid crystal display device includes a liquid crystal display panel having a pad portion on one side, a guide panel for supporting a back edge of the liquid crystal display panel, A cover glass attached to an upper portion of the liquid crystal display panel, and a middle frame for supporting the rear edge of the cover glass and accommodating the guide panel in a state of being separated from the bottom surface, the guide panel being provided along an end portion of the pad portion, And a protruding portion protruding downward from the outer surface of the guide panel for supporting the pad portion. The gap between the protruding portion and the bottom surface of the middle frame is set to be greater than the gap between the back surface of the guide panel Is smaller than an interval between the bottom surface of the middle frame and the bottom surface of the middle frame.

Figure P1020150189664

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of reducing the possibility of breakage of a pad portion provided at one side of a liquid crystal display panel in an external impact.

2. Description of the Related Art [0002] In recent years, display fields for visually transmitting information in line with the information age have been developed. Various flat display devices capable of thinning, lightening, and slimming have been developed.

Particularly, liquid crystal display devices are widely used in various fields such as TV, monitor, and mobile.

Such a liquid crystal display device includes a liquid crystal display panel for displaying an image and a guide panel for supporting a rear edge of the liquid crystal display panel. In the liquid crystal display panel, the upper substrate and the lower substrate are bonded together with the liquid crystal layer interposed therebetween. And a pad portion to which a flexible printed circuit board is attached is provided on one side of the liquid crystal display panel. Such a pad portion is not formed of a cemented substrate in which an upper substrate and a lower substrate are cemented together but consists of only a lower substrate. On the other hand, the rear edge of the liquid crystal display panel is attached to the guide panel. Particularly, the back surface of the pad portion is attached to one side of the guide panel, but it is not susceptible to shock because it is not a bonded substrate.

Such a liquid crystal display device is subjected to various tests in order to ensure quality. In particular, when the middle frame is deformed due to an external impact in the drop test, the guide panel is also subjected to the impact according to the deformed middle frame. Also, the guide panel impacted by the middle frame can be deformed. However, there is a problem that the pad portion composed of a single substrate attached to one side of the panel is easily broken.

In order to solve the above problems, an object of the present invention is to provide a liquid crystal display device capable of reducing the possibility of breakage of a pad portion provided on one side of a liquid crystal display panel.

In order to solve such a problem, a liquid crystal display according to the present invention comprises a liquid crystal display panel having a pad portion on one side, a guide panel for supporting a rear edge of the liquid crystal display panel, a cover glass And a middle frame for supporting the rear edge of the cover glass and accommodating the guide panel in a state spaced apart from the bottom surface, the guide panel having a depression provided at the lower end of the pad portion, And has at least two protruding projections.

And the distance between the end face of each projection and the bottom face of the middle frame is smaller than the distance between the back face of the guide panel and the bottom face of the middle frame.

The flexible printed circuit board further includes a flexible printed circuit board having one side attached to the pad portion and the other side secured by a heat stack projecting from one side rear surface of the guide panel, ), And the heat stack is spaced apart from the avoidance groove.

And the gap between each heat stack and the bottom surface of each of the avoidance grooves is larger than the gap between the protrusion and the bottom surface of the middle frame.

In the present invention, a depression is provided in a guide panel along an end portion of a pad portion provided on one side of a liquid crystal display panel so that the depression is prevented from being deformed from the guide panel to the pad portion end It is possible to reduce the possibility of breakage of the pad portion provided on one side of the liquid crystal display panel.

 In addition, it is possible to reduce the possibility of breakage of the pad portion by providing the protrusion in the lower direction from the outer surface of the guide panel so that the impact can be transmitted to the end portion of the pad portion where the possibility of breakage is reduced.

The middle frame has a plurality of avoidance grooves corresponding to a plurality of heat stacks protruding from the guide panel in the direction of the middle frame, thereby reducing the impact on the pad portion through the heat stack, thereby reducing damage to the liquid crystal display panel.

1 is an exploded perspective view showing a liquid crystal display device according to the present invention.
2 is a cross-sectional view taken along the line A-A 'in the liquid crystal display shown in FIG.
FIG. 3 is an exploded perspective view for explaining the coupling relation between the pad portion and the guide panel in FIG. 1. FIG.
4 is a rear view showing the back surface of the guide panel in Fig.
5 is a cross-sectional view of a liquid crystal display panel showing a state in which an external impact is transmitted.
6A is a graph showing a result of stress measurement on a liquid crystal display panel of a conventional liquid crystal display device during a drop test, and FIG. 6B is a graph showing a result of measurement of stress transmitted to a liquid crystal display panel of a liquid crystal display device according to the present invention Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and embodiments.

FIG. 1 is an exploded perspective view showing a liquid crystal display device according to the present invention, and FIG. 2 is a cross-sectional view taken along the line A-A 'in the liquid crystal display device shown in FIG.

1 and 2, a liquid crystal display device according to the present invention includes a liquid crystal display panel 100, a cover glass 200 attached to the upper portion of the liquid crystal display panel 100, A light source 520 for supplying light to the liquid crystal display panel 100, a light guide plate 510, and a plurality of optical sheets (not shown). The flexible printed circuit board 400 is connected to the pad unit 190, And a guide panel 300 for receiving the light source 520, the light guide plate 510 and the optical sheet 530 and supporting the liquid crystal display panel 100.

 The liquid crystal display panel 100 implements an image using the light emitted from the light source 520. The liquid crystal display panel 100 includes a lower substrate 110, an upper substrate 120, a lower polarizer 130, and an upper polarizer 140.

The lower substrate 110 includes a plurality of gate lines, a plurality of data lines crossing the plurality of gate lines, a plurality of thin film transistors formed at the intersections of the plurality of gate lines and the plurality of data lines, Connected pixel electrodes are formed.

The upper substrate 120 includes a color filter for coloring light, a black matrix for preventing light leakage, and a common electrode for forming a vertical electric field with the pixel electrode.

The lower substrate 110 and the upper substrate 120 are confronted with each other with the liquid crystal layer interposed therebetween. The liquid crystal layer is rotated by the electric field between the pixel electrode and the common electrode, and the amount of light transmission is determined accordingly.

A pad portion 101 is provided on one side of the liquid crystal display panel 100 in the first direction to be electrically connected to the flexible printed circuit board 400. The pad portion 101 may be formed only of the lower substrate 110, not the adhesion substrate of the upper substrate 120 and the lower substrate 110.

The gap filler tape 420 is attached to the area of the pad portion except the area where the flexible circuit board 400 is attached to the pad portion and is separated from the cover glass 200 at the upper portion. The gap filler tape 420 protects the pad portion 101 from impact.

The cover glass 200 is attached to the upper portion of the liquid crystal display panel 100. The cover glass 200 can function as a touch panel that absorbs impact from the outside to prevent the liquid crystal display panel 100 from being broken, and detects touch coordinates by a hand or a pen.

This cover glass 200 is generally attached to the upper surface of the liquid crystal display panel 100 except for the pad portion 101 by OCR (Optical Clear Resin).

Particularly, the area of the cover glass 200 is larger than the area of the liquid crystal display panel 100, so that the upper surface of the liquid crystal display panel 100 is attached to a portion except the edge of the back surface. The middle frame supporting the back edge of the cover glass is adhered and fixed to the back edge of the cover glass 200 where the upper surface of the liquid crystal display panel 100 is attached.

The rear surface of the guide panel 300 located below the liquid crystal display panel 100 is spaced from the bottom surface of the middle frame 600 because the rear surface of the cover glass 200 is adhered and fixed to the middle frame 600.

The backlight unit 500 includes a light source 520 for generating light, a light guide plate 510 for guiding light emitted from the light source 520, and a plurality of optical sheets (not shown) for improving the characteristics of light emitted from the light guide plate 510 A guide panel 300 on which the liquid crystal display panel 100 is mounted and accommodates the backlight unit and a reflection plate 540 disposed on the lower portion 510 of the light guide plate.

The light guide plate 510 guides the light emitted from the light source 520 and outputs the light to the liquid crystal display panel 100.

The reflection plate 540 is superimposed on the lower surface of the light guide plate 510 and the guide panel so as to reflect the light toward the liquid crystal display panel 100 to prevent light loss and prevent the light guide plate 510 from flowing.

The light source 520 may be a CCFL (Cold Cathod Fluorescent Lamp), an EFFL (External Electrode Fluorescent Lamp), or a light emitting diode (LED).

An edge backlight unit disposed at a lower portion of one side of the liquid crystal display panel 100 according to the position of the light source and a direct-type backlight unit disposed at the entire rear surface of the liquid crystal display panel 100.

The plurality of optical sheets 530 may include an upper prism sheet 533, a lower prism sheet 533, and a diffusion sheet 531. The upper and lower prism sheets 532 and 533 control the direction of the light emitted from the light guide plate 510 to improve the viewing angle and the diffusion sheet 531 uniformizes the light emitted from the light guide plate 510, 100).

The guide panel 300 houses the light guide plate 510, the light source 520 and the optical sheet 530 and supports the rear edge of the liquid crystal display panel 100.

The guide panel 300 accommodates the light guide plate 510 in an area excluding the area where the light source 520 and the light source on one side are stored. A diffusion sheet 531, a lower prism sheet 532 and an upper prism sheet 533 are sequentially stacked on the light guide plate 510 and a reflection plate 540 is attached to the back surface of the light guide plate 510.

The guide panel 300 fixes the back surface of the liquid crystal display panel 100 with the light shielding tape 710, which is one kind of double-sided tape. At this time, the flexible printed circuit board 400 has a recessed groove 315 for accommodating a plurality of circuit elements 440.

At this time, the light shielding tape 710 is attached by overlapping a part of the edges of the optical sheets 530 attached to the upper portion of the guide panel 300 and the light guide plate 510. Accordingly, the leakage of light between the backlight unit 500 and the guide panel 300 can be blocked to remove the light leakage.

FIG. 3 is an exploded perspective view for explaining a coupling relation between the pad portion and the guide panel in FIG. 1, and FIG. 4 is a rear view showing the back surface of the guide panel in FIG.

Hereinafter, the coupling structure of the pad portion, the guide panel, and the flexible printed circuit board will be described in detail with reference to FIG. 3 and FIG.

3, a guide panel 300 for supporting a pad portion 101 provided on one side of the liquid crystal display panel 100 in a first direction includes a depression 311, a plurality of protrusions 312, A stopper 313 and a plurality of heat stacks 340.

The depression 311 is formed with a guide panel 300 in a first direction and the guide part 300 is formed along the edge of the pad part 101 such that the end of the pad part 101 is separated from the guide panel 300. [ And has a downwardly depressed shape.

Even if the end portion of the guide panel 300 in the first direction is bent upward due to an external impact by the depression 311, It is possible to reduce the possibility that the stress is reduced and the end portion of the pad portion 101 is broken.

The light shielding tape 710 which is disposed between the liquid crystal display panel 100 and the guide panel 300 and which adheres the liquid crystal display panel 100 to the guide panel 300 is formed to the portion where the depression 311 is formed And may be attached to the rear end of the pad portion 101. [

The stopper 313 is formed to protrude in the direction of the cover glass 200 in the upper direction on the edge of the end portion of the guide panel 300 supporting the pad portion 101 and is spaced apart from the cover glass 200 by a predetermined distance .

A gap is provided between the upper surface of the stopper 313 and the lower surface of the cover glass 200 so that the end of the guide panel 300 is spaced apart from the upper surface of the stopper 313 and the lower surface of the cover glass 200 . Thus, the impact transmitted to the cover glass 200 from the guide panel 300 can be mitigated by the elasticity of the guide panel 300. [

At least two protrusions are provided and protrude downward on the outer surface of the guide panel 300 in the first direction for supporting the pad portion 101.

Referring to FIG. 4, the protruding portion protrudes from the outer surface of the guide panel 300 in the first direction for supporting the pad portion 101. Particularly at the back corner portion of the guide panel in the first direction. These protrusions are spaced apart from the inner bottom surface of the middle frame 600 housing the guide panel.

When the shape of the middle frame 600 located under the pad 101 is deformed due to an external impact, the protrusion 312 first contacts the middle frame 600 and the end of the guide panel 300 is bent upward do. At this time, the end portion of the pad portion 101 can avoid the stress transmitted by the depressed portion 311 and is not damaged.

On the other hand, in the absence of the protrusion 312, when the stress is not transmitted to the end portion of the pad portion which can avoid the stress by the depression 311, the pad portion 101 is formed in the liquid crystal display panel 100 The boundary portion may be broken.

The middle frame 600 is provided under the panel guide 300. The plurality of protrusions 312 are spaced apart from the bottom surface of the middle frame 600. [ The end faces of the plurality of protrusions 312 are formed to have the smallest distance from the inner bottom face of the middle frame 600.

Accordingly, when the shape of the middle frame 600 is deformed due to an external impact, the protruding portion 312 of the guide panel 300 is first brought into first contact with the end portion of the guide panel 300 in the first direction, . At this time, stress can be avoided by the depressed portion 311 at the end portion of the pad portion 101, so that breakage of the pad portion 101 can be prevented.

3 and 4, the heat stack 340 is provided on one side of the rear surface of the guide panel 300 in the first direction for supporting the pad portion 101. [ The flexible printed circuit board 400 and the heat stack 340 are formed through the following process. A plurality of cylindrical convex portions are provided on one side of the back surface of the guide panel 300 where the pad portion 101 is fixed in the liquid crystal display panel 100.

3, the flexible printed circuit board 400 connected to one side of the pad unit 101 extends to cover the side surface of the guide panel 300 in the first direction, And is fixed to the back surface of the panel 300.

One side of the flexible printed circuit board 400 has a plurality of columnar convex portions for fixing the flexible printed circuit board 400 on one side of the backside of the guide panel, A through hole 430 is provided.

The plurality of convex portions penetrate through the plurality of through holes 430 of the flexible printed circuit board 400 and extend in the horizontal direction by pressing the ends of the convex portions protruding in the through hole 430 with a heated pressing member Thereby forming a head having a diameter larger than that of the through hole 430. The flexible printed circuit board 400 is fixed to the guide panel 300 by such a head. The convex portion having the head with the end portion deformed is referred to as a heat stack 340.

With this heat stack 340, the flexible printed circuit board 400 can be easily fixed to the back surface of the guide panel 300 without using separate separate fasteners such as screws.

The heat stack 340 protrudes from the flexible printed circuit board 400 by the deformed head portion. And the heat stack 340 is kept spaced apart from the bottom surface of the middle frame 600. [

When the guide panel 300 is deformed by the protruded heat stack 340 when the middle frame 600 is deformed due to external impact, the end of the guide panel 300 is bent toward the end of the pad portion 101 The other part is bent. Accordingly, the pad portion 101 may be broken at a boundary portion where the pad portion 101 starts to be formed in the liquid crystal display panel 100.

To prevent this, The protrusion 312 provided on the guide panel 300 in the first direction is further projected downward so that the distance between the protrusion 312 and the inner bottom surface of the middle frame 600 is greater than the distance between the heat stack 340 and the middle frame 600).

When the middle frame 600 is deformed due to an external impact, the protrusion 312 first contacts the middle frame 600 rather than the heat stack 340 so that the end of the guide panel 300 in the first direction It can be bent. When the end portion of the guide panel 300 in the first direction is bent, stress can be avoided by the depressed portion 311 at the end portion of the pad portion 101, so that breakage of the pad portion can be reduced.

Alternatively, a plurality of avoidance grooves 610 corresponding to the plurality of heat stacks 340 may be provided on the inner bottom surface of the middle frame 600. [

The width of the heat stack 340 may be greater than the width of the heat stack 340 at a position corresponding to the heat stack 340 on the bottom surface of the middle frame 600, 340 may be provided with a plurality of escape grooves 610 that are deeper than or equal to the length protruding from the flexible printed circuit board 400.

The gap between the inner bottom surface of the middle frame 600 and the heat stack 340 is widened. Thereby preventing the external impact from being transmitted to the heat stack 340 and allowing the protrusion 340 to be transmitted to the end of the guide panel 300 in the first direction.

On the other hand, the gap between the heat stack 340 and the bottom surface in the avoidance groove 610 is formed to be larger than the gap between the protrusion and the bottom surface of the middle frame. This allows the external impact to be transmitted to the protruding portion 312 before the heat stack 340 and allows the external impact to be transmitted to the pad portion 101 by the depressed portion 311 by bending the end portion of the guide panel 300. [ The damage to the pad portion 101 can be prevented.

By providing the plurality of avoidance grooves 610 on the bottom surface of the middle frame 600, contact with the heat stack 340 can be prevented as much as possible even if the middle frame 600 is temporarily deformed by the impact.

A concave portion 314 (see FIG. 3) which is recessed upward in one side of the back surface of the guide panel 300 in the first direction so as to accommodate a component (FPC component) 440 including various elements included in the flexible printed circuit board 400 ).

5 is a cross-sectional view of a liquid crystal display panel showing a state in which an external impact is transmitted.

Referring to FIG. 5, when the middle frame 600 is deformed due to an external impact applied to the guide panel 300 supporting the pad unit 101, the middle frame 600 first contacts the protrusions. This is because the distance between the protrusion 311 and the middle frame is smaller than the heat stack 340 or the middle frame 600 is provided with the avoidance groove 610 at a position corresponding to the heat stack 340.

As a result, the end portion of the guide panel 300 in the first direction is bent upward. A part of the impact is relieved in the process of bending the end portion of the guide panel 300 formed of the mold water and the stopper 313 protruding upward in the guide panel 300 while the end portion of the guide panel 300 is bent upward Is brought into contact with the cover glass 200. Thereby preventing the guide panel 300 from being further deformed while being blocked by the cover glass 200. Therefore, it is possible to prevent the end portion of the pad portion 101 from being damaged by the depressed portion 311 and to transmit the impact only to the end portion of the pad portion 101 , It is possible to reduce the possibility of breakage of the pad portion 101 at the boundary point extending from the adhesion substrate of the upper and lower substrates only to the lower substrate 110.

If the protrusion 312 is not provided, the end portion of the guide panel 310 in the first direction is not bent by the heat stack 340 described later, and the lower substrate 110 and the upper substrate 120 are bonded together. And the pad portion 101 are not provided with depressions that can avoid stress, so that they can be broken.

Even if the guide panel 300 is deformed due to the impact from the second direction opposite to the first direction in which the pad portion 101 is formed in the liquid crystal display panel 100, Since the lower substrate 110 and the upper substrate 120 are bonded together, they are not easily damaged by the impact.

6A is a graph showing a result of stress measurement on a liquid crystal display panel of a conventional liquid crystal display device during a drop test, and FIG. 6B is a graph showing a result of measurement of stress transmitted to a liquid crystal display panel of a liquid crystal display device according to the present invention Fig.

Referring to FIG. 6A, a test result of a conventional liquid crystal display device is as follows. A maximum of 365.57 Mpa of stress is applied to the pad side of the liquid crystal display panel.

Referring to FIG. 6B, the test results of the liquid crystal display according to the exemplary embodiment of the present invention show that the stress applied to the pad portion of the conventional liquid crystal display panel is reduced by the depressions, protrusions, The maximum stress of 304.80Mpa is measured on the pad side of the display panel.

That is, the liquid crystal display according to the embodiment of the present invention can reduce the stress transmitted to the liquid crystal display panel by a maximum of 60.9 Mpa as compared with the conventional liquid crystal display panel, The possibility of breakage can be reduced.

100: liquid crystal display panel 110: lower substrate
120: upper substrate 130: lower polarizer plate
140: upper polarizer plate 200: cover glass
210: OCR 300: Guide panel
311: depression 312: protrusion
313: Stopper 400: Flexible printed circuit board
420: gap fill tape 430: through hole
500: backlight unit 510: light guide plate
520: light source 530: optical sheet
540: reflector 600: middle frame
610: groove 710: shielding tape
720: Double-sided tape

Claims (5)

A liquid crystal display panel having a pad portion on one side in a first direction;
A guide panel for supporting a rear edge of the liquid crystal display panel;
A cover glass having an area larger than that of the liquid crystal display panel and having an upper surface of the liquid crystal display panel attached to a portion of the backlight excluding the edge; And
And a middle frame which supports the rear edge of the cover glass and accommodates the guide panel in a state of being separated from the inner bottom surface,
The guide panel includes:
A depressed portion in a region corresponding to the end of the pad portion,
And at least one protrusion protruding downward from an outer side surface in the first direction. The method according to claim 1,
Further comprising a flexible printed circuit board connected to one side of the pad portion and extending to surround a side surface of the guide panel and fixed to the back surface of the guide panel as a plurality of heat stacks,
Wherein an interval between each of the heat stacks and an inner bottom surface of the middle frame is larger than an interval between the projecting portion and an inner bottom surface of the middle frame. The method according to claim 1,
Further comprising a flexible printed circuit board connected to one side of the pad portion and extending to surround a side surface of the guide panel and fixed to the back surface of the guide panel as a plurality of heat stacks,
Wherein the middle frame has a plurality of avoidance grooves at positions corresponding to the respective heat stacks. The method of claim 3,
Wherein a depth of the avoidance groove is equal to a height of each of the heat stacks projected from the flexible printed circuit board or deeper than a height of each of the heat stacks protruded from the flexible printed circuit board. 5. The method of claim 4,
Wherein an interval between each of the heat stacks and an inner bottom surface of each of the avoidance grooves is greater than an interval between the projecting portion and an inner bottom surface of the middle frame.
KR1020150189664A 2015-12-30 2015-12-30 Liquid crystal display device KR20170079277A (en)

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KR1020150189664A KR20170079277A (en) 2015-12-30 2015-12-30 Liquid crystal display device

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Application Number Priority Date Filing Date Title
KR1020150189664A KR20170079277A (en) 2015-12-30 2015-12-30 Liquid crystal display device

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KR20170079277A true KR20170079277A (en) 2017-07-10

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