KR101281923B1 - Liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device which can improve the reliability of the liquid crystal display device by fixing the FPC to the support main.

The liquid crystal display device of the present invention includes a liquid crystal display panel and a backlight unit for supplying light to the liquid crystal display panel; A support main having a rectangular frame shape in which the liquid crystal display panel and the backlight unit are accommodated; A cover bottom surrounding the lower outer side and the bottom of the support main; A flexible printed circuit (FPC) mounted on a driving circuit to supply driving signals to the liquid crystal display panel and connected to the liquid crystal display panel and inserted between the cover bottom and the support main; A hook for bending the FPC along an outer surface of the support main by being positioned in an opposite direction to the outer surface of the support main with the FPC therebetween.

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

1 is a cross-sectional view showing a liquid crystal display device incorporated in a conventional communication means.

FIG. 2 is a diagram for describing a defect in which an FPC is separated from the liquid crystal display shown in FIG. 1.

3 is a cross-sectional view showing a liquid crystal display device according to a first embodiment of the present invention.

4 is a view illustrating a rear surface of the cover bottom in FIG. 3.

FIG. 5 is a view illustrating a rear surface of the liquid crystal display shown in FIG. 3.

6 is a perspective view of a liquid crystal display according to a second exemplary embodiment of the present invention.

FIG. 7 is a cross-sectional view taken along line II ′ of FIG. 6;

FIG. 8 is a perspective view illustrating a structure when the liquid crystal display of FIG. 3 is viewed from the same angle as the liquid crystal display of FIG. 6.

FIG. 9 is a cross-sectional view taken along line III-III ′ of FIG. 8;

FIG. 10 is a cross-sectional view taken along line II-II ′ of FIG. 6.

Description of the Related Art

2, 102: liquid crystal display panel 6,106: FPC

8,108: Cover bottom 20, 120: Optical sheet

18, 118: Light guide plate 16, 116: Reflective sheet

10, 110: light source 12,112: drive circuit

14 double-sided tape 22122 support main

125: hook 162: protrusion

124: first hole 126: second hole

107: third hole

The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display module embedded in the communication means.

In general, a liquid crystal display ("LCD") is a representative flat panel display that displays an image by adjusting the amount of light beam transmitted to correspond to an image signal. Particularly, the application range of LCDs is gradually widening due to characteristics such as weight reduction, thinning, and driving of low power consumption. According to this trend, LCD is being applied as a display device for communication means such as office automation devices, notebook computers, mobile phones, and the like.

1 is a cross-sectional view showing a liquid crystal display device incorporated in a conventional communication means.

The liquid crystal display shown in FIG. 1 includes a liquid crystal display panel 2, a backlight unit 30 for irradiating light to the liquid crystal display panel 2, a liquid crystal display panel 2 and a backlight unit 30. It is connected to the support main 22 for supporting and storing, the cover bottom 8 surrounding the lower part of the support main, and the pad portion 4 of the liquid crystal display panel 2, and to cover one side of the cover bottom 8. A flexible printed circuit (FPC) 6 attached to the rear surface of the cover bottom 8 is provided.

In the liquid crystal display panel 2, liquid crystal cells are arranged in an active matrix form between the color filter array substrate 2a and the thin film transistor array substrate 2b, and each of the liquid crystal cells switches a video signal. Thin Film Transistor is installed. Since the refractive index of each of the liquid crystal cells is changed according to the video signal, an image corresponding to the video signal is displayed.

The backlight unit 30 includes a light source 10 for irradiating light to the liquid crystal display panel 2, a light guide plate 18 for advancing light emitted from the light source 10 toward the liquid crystal display panel 2, and a light guide plate ( 18 and a plurality of optical sheets 20 for irradiating the liquid crystal display panel 2 by improving the efficiency of light emitted from the light guide plate 18.

The light source 10 serves to supply light to the liquid crystal display panel 2 by using a light emitting diode, a fluorescent lamp, or the like.

The light guide plate 18 guides the light incident from the light source 10 toward the liquid crystal display panel 2 with a constant inclination angle. In this case, the reflective sheet 16 guides the light generated from the light source 10 toward the light guide plate 18 and prevents the loss of the light generated from the light source 10.

The optical sheets 20 allow the light incident at an oblique angle from the surfaces of the reflective sheet 16 and the light guide plate 18 to travel vertically in the direction of the liquid crystal display panel 2. In other words, the optical sheets 20 serve to raise the propagation direction of light from the surfaces of the optical sheets 20.

The support main 22 has a rectangular frame (or rectangular frame) shape, and a stepped step that can be supported at the same time as the backlight unit 30 and the liquid crystal display panel 2 are accommodated on the inner side of each side is formed. have.

The cover bottom 8 is formed to surround the support main 22 at the lowest surface of the liquid crystal display and also serves to protect the backlight unit 30 from the external environment by preventing the backlight unit 30 from being exposed to the outside. do.

The FPC 6 is connected to the pad portion 4 of the liquid crystal display panel 2, and a driving circuit portion 12 for driving the liquid crystal display panel 2 is mounted, and a plurality of signal lines are formed. The FPC 6 is connected to the pad portion 4 of the liquid crystal display panel 2 and has a structure that is bent to surround the side surface of the cover bottom 8 and has a cover bottom through the double-sided tape 14. It is attached to the back of 8).

On the other hand, the FPC 6 is located so as to surround the side of the cover bottom (8) is frequently damaged by the side edges of the cover bottom (8). Accordingly, a problem arises in that signal transmission in the damaged area of the FPC 6 is not made accurately. In addition, in the high temperature and high humidity environment, the adhesiveness of the double-sided tape 14 is reduced or is not fixed to the cover bottom 8 with sufficient force, and as shown in FIG. 2 due to the restoring force, elastic force, etc. of the FPC 6. A problem arises in which the FPC 6 is separated from the side and back of the cover bottom 8. These problems cause a problem that the reliability of the entire liquid crystal display device is lowered.

Accordingly, an object of the present invention is to provide a liquid crystal display device for embedding a mobile phone that can protect the FPC by placing the FPC attached to the outside of the cover bottom inside the cover bottom.

Another object of the present invention is to firmly fix the FPC to the support main, so that the liquid crystal display panel, the backlight unit, and the like can be positioned at the correct position, thereby improving the reliability of the liquid crystal display device.

In order to achieve the above object, a liquid crystal display device according to an embodiment of the present invention includes a liquid crystal display panel and a backlight unit for supplying light to the liquid crystal display panel; A support main having a rectangular frame shape in which the liquid crystal display panel and the backlight unit are accommodated; A cover bottom surrounding the lower outer side and the bottom of the support main; A flexible printed circuit (FPC) mounted on a driving circuit to supply driving signals to the liquid crystal display panel and connected to the liquid crystal display panel and inserted between the cover bottom and the support main; A hook for bending the FPC along an outer surface of the support main by being positioned in an opposite direction to the outer surface of the support main with the FPC therebetween.

The hook protrudes from the corner region of the support main and extends toward the center of the side of the support main and is bent along the outer surface of the support main.

At least one protrusion protruding from the outer surface of the support main and coupled to the first hole penetrating the FPC.

The cover bottom includes second and third holes, and the driving circuit part of the FPC is exposed to the outside through the second hole, and one side of the FPC is exposed to the outside through the third hole. do.

The liquid crystal display device is used for communication means.

One side of the FPC exposed through the third hole is connected to the system of the communication means.

Other objects and features of the present invention in addition to the above object will be apparent from the description of the embodiments with reference to the accompanying drawings.

3 is a diagram illustrating a liquid crystal display according to a first embodiment of the present invention.

The liquid crystal display shown in FIG. 3 includes a liquid crystal display panel 102, a backlight unit 130 for irradiating light to the liquid crystal display panel 102, and a support main for supporting and storing the backlight unit 130. The cover bottom 108 surrounding the lower portion of the support main 122 and the pad portion 104 of the liquid crystal display panel 102 is connected to the cover bottom 108 and is surrounded by the inner surface of the cover bottom 108. The FPC 106 includes a driving circuit 112 for driving the display panel 102.

In the liquid crystal display panel 102, liquid crystal cells are arranged in an active matrix form between the color filter array substrate 102a and the thin film transistor array substrate 102b, and each of the liquid crystal cells switches a video signal. Thin Film Transistor is installed. Since the refractive index of each of the liquid crystal cells is changed according to the video signal, an image corresponding to the video signal is displayed.

The backlight unit 130 may include a light source 110 for irradiating light to the liquid crystal display panel 102, a light guide plate 118 for propagating light emitted from the light source 110 toward the liquid crystal display panel 102, and a light guide plate ( A reflective sheet 116 disposed on the rear surface of the substrate 118 and a plurality of optical sheets 120 for improving the efficiency of light emitted from the light guide plate 118 and irradiating the liquid crystal display panel 102 are provided.

The light source 110 serves to supply light to the liquid crystal display panel 102 by using a light emitting diode, a fluorescent lamp, or the like.

The light guide plate 118 guides the light incident from the light source 110 toward the liquid crystal display panel 102 at a predetermined inclination angle. In this case, the reflective sheet 116 guides the light generated from the light source 110 toward the light guide plate 118 and prevents the loss of the light generated from the light source 110.

The optical sheets 120 allow the light incident at an oblique angle from the surfaces of the reflective sheet 116 and the light guide plate 118 to vertically travel in the direction of the liquid crystal display panel 102. In other words, the optical sheets 120 serve to raise the propagation direction of light from the surfaces of the optical sheets 120.

The support main 122 has a rectangular frame (or rectangular frame) shape and a stepped step of a shape in which the backlight unit 130 and the liquid crystal display panel 102 can be accommodated and supported is formed inside each side. .

The cover bottom 108 is formed to surround the support main 122 at the lowermost surface of the liquid crystal display and also serves to protect the back of the backlight unit 130.

This will be described in more detail with reference to FIGS. 3 to 5 as follows.

First, the FPC 106 is electrically connected to the pad unit 104 of the liquid crystal display panel 102, and a driving circuit unit 112 for driving the liquid crystal display panel 102 is mounted and a plurality of signal lines are formed. have. In addition, the end of the FPC 106 is connected to a system such as communication means.

The FPC 106 is connected to the pad portion 104 of the liquid crystal display panel 102 and has a structure that is bent along the inner surface of the cover bottom 108 and the outer surface of the support main 122. That is, the FPC 106 is inserted between the cover bottom 108 and the support main 122 to be bent along the support main 122. Accordingly, unlike the related art, the FPC 106 may be protected by the inner surface of the cover bottom 108.

Here, the driving circuit unit 112 mounted on the FPC 106 is exposed to the outside by having a rather large volume, and the end of the FPC 106 is exposed to the outside for connection with an external system.

That is, in the present invention, as shown in FIG. 4, two holes 124 and 126 are provided in the cover bottom 108. The driving circuit portion of the FPC 106 is inserted from the inside of the cover bottom to the outside in the first hole 124 in the cover bottom 108 of this structure. The second hole 126 is an area where the end of the FPC 106 may be exposed. That is, since the driving circuit of the FPC 106 is exposed through the first hole 124 on the rear surface of the cover bottom 108 illustrated in FIG. 5, the space in the cover bottom 108 is not greatly burdened. In addition, the end of the FPC 106 is exposed in the second hole 126 of the cover bottom 108 to allow connection with an external system.

In the liquid crystal display device according to the first embodiment of the present invention described above, the FPC 106 is protected by the inner surface of the cover bottom 108, thereby preventing damage to signal lines in the FPC 106 and the like. Is not separated by the cover bottom 108 does not occur.

However, the structure of the cover bottom 108 and the support main 122 shown in FIGS. 3 to 5 may cause a problem that does not sufficiently suppress the restoring force, elastic force, etc. in the bending FPC 106 itself. . That is, the FPC 106 is not bent in a "c" shape along the outer surface of the support main 122 but fixed to the outer surface of the support main 122 such as being bent in a round shape on the outer surface of the support main 122. It will not be possible. As a result, the liquid crystal display panel 102 connected to the FPC 106 may also not be fixed in position and other backlight units 130 may not be fixed in position, thereby reducing the reliability of the entire liquid crystal display. In addition, when the end of the FPC 106 is connected to a system such as communication means, the FPC 106 is not fixed in position, thereby causing a misalignment problem between the FPC 106 and the like for connection to the system.

In order to solve such a problem, the second embodiment of the present invention proposes a method of fixing the FPC 106 while protecting the FPC 106.

6 is a perspective view illustrating a part of a liquid crystal display according to a second exemplary embodiment of the present invention, and FIG. 7 is a cross-sectional view taken along line II ′ of FIG. 6.

6 and 7 have a hook 125 extending from the corner region of the support main 122 to fix the FPC 106 to the support main 122 as compared with the first embodiment of the present invention. And the protrusion 132 extending from the side of the support main 122 to penetrate the FPC 106 to fasten the FPC 106 to the outer surface of the support main 122. Since the components have the same reference numerals for the same components as in FIGS. 3 to 5, the detailed description thereof will be omitted.

In the second exemplary embodiment of the present invention, as illustrated in FIGS. 6 and 7, hooks 125 having a shape bent in the same shape as the outer bent surface of the support main 122 are formed in the upper corner region, respectively. When the FPC 106 is bent along the outer bent surface of the support main 122, the FPC 106 has a round shape at the outer bent surface of the support main 122 and prevents it from moving away due to a restoring force or elastic force. Do it.

This will be described in detail with reference to FIGS. 8 and 9 showing regions corresponding to FIGS. 6 and 7 in the liquid crystal display according to the first embodiment.

When the FPC 106 connected to the pad portion 104 of the liquid crystal display panel 102 in the first embodiment of the present invention surrounds the side surface of the support main 122, the FPC 106 is as shown in FIGS. 8 and 9. The FPC 106 may not be bent sufficiently due to its restoring force. That is, the FPC 106 inserted or sandwiched between the cover bottom 108 and the support main 122 may be supported between the cover bottom 108 and the support main 122 and be bent together along the bent surface, but the support main may be In the upper region of the 122, there is no separate support means, so that the FPC 106 is not sufficiently fixed to bend, such as a rounded shape toward the outside of the support main 122.

In order to overcome this disadvantage, FIGS. 6 and 7 include hooks 125 that can apply external pressure to the FPC 106. The hooks 125 protrude from upper edges of the support main 122, respectively, and extend in the direction of the center of the sides of the support main 122, and are bent along the outer surface of the support main 122. As a result, the outer region of the FPC 106 is inserted or pinched between the outer surface of the support main 122 and the hook 125 and the restoration of the FPC 106 is restricted by the hook 125. Accordingly, the FPC 106 can be firmly fixed in the liquid crystal display device.

Furthermore, at one side of the support main 122 parallel to the FPC 106, at least one protrusion 132 is provided, and the FPC 106 has a third hole 107 into which the protrusion 132 can be inserted. And the protrusion 132 is fastened in the third hole 107. Accordingly, as shown in FIG. 10, the inner surface of the FPC 106 may be fixed to the outer surface of the support main 122.

As such, the outer region of the FPC 106 is fixed by using the hook 125 formed at the corner region of the support main 122, and the FPC 106 is formed by using the protrusion 132 extended from the side of the support main 122. It is possible to fix the internal area of the). As a result, the FPC 106 can be firmly fixed in the liquid crystal display, so that the liquid crystal display panel 102 connected to the FPC 106 can also be fixed in position, and the other backlight units 130 and the like are also fixed in position. It can be fixed to. As a result, the reliability of the entire liquid crystal display device is improved. In addition, the end of the FPC 106 can be fixed in position when the FPC 106 is connected to a system such as communication means, such as alignment between the FPC 106 and the connection for connecting to the system, etc. The assembling work of the display device is easy and the reliability is improved.

As described above, in the liquid crystal display according to the exemplary embodiment of the present invention, the FPC can be protected from the dlh part by inserting the FPC attached to the outside of the cover bottom between the cover bottom and the support main.

In addition, it is possible to fix the FPC by the support main using the hook formed in the corner region of the support main and the protrusion protruding from the side of the support main. As a result, the liquid crystal display panel connected to the FPC can also be fixed in position and other backlight units can also be fixed in position, thereby improving the reliability of the liquid crystal display apparatus. Furthermore, when the FPC end is connected to a system such as a communication means, the FPC can be fixed in place, thereby facilitating the assembly process between the connection and the FPC for connecting to the system, and the accuracy of the alignment and Reliability is also improved.

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.

Claims (6)

A backlight unit for supplying light to the liquid crystal display panel and the liquid crystal display panel; A support main having a rectangular frame shape in which the liquid crystal display panel and the backlight unit are accommodated; A cover bottom surrounding the lower outer side and the bottom of the support main; A flexible printed circuit (FPC) mounted on a driving circuit to supply driving signals to the liquid crystal display panel and connected to the liquid crystal display panel and inserted between the cover bottom and the support main; A hook for bending the FPC along an outer surface of the support main by being positioned in an opposite direction to the outer surface of the support main with the FPC therebetween, The hook is formed bent along the outer surface and the upper surface of the support main, The cover bottom has second and third holes, The driving circuit unit of the FPC is exposed to the outside through the second hole, one side of the FPC is exposed to the outside through the third hole. delete The method of claim 1, And at least one protrusion protruding from an outer surface of the support main to be coupled to a first hole penetrating through the FPC. A backlight unit for supplying light to the liquid crystal display panel and the liquid crystal display panel; A support main having a rectangular frame shape in which the liquid crystal display panel and the backlight unit are accommodated; A cover bottom surrounding the lower outer side and the bottom of the support main; A flexible printed circuit (FPC) mounted on a driving circuit to supply driving signals to the liquid crystal display panel and connected to the liquid crystal display panel and inserted between the cover bottom and the support main; A hook for bending the FPC along the outer surface of the support main by being positioned in an opposite direction to the outer surface of the support main with the FPC therebetween, the cover bottom having second and third holes, The driving circuit unit of the FPC is exposed to the outside through the second hole, one side of the FPC is exposed to the outside through the third hole. delete 5. The method of claim 4, And the liquid crystal display is used for communication means and one side of the FPC exposed through the third hole is connected to the system of the communication means.

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