KR20170080284A - Liquid crystal display device - Google Patents

Abstract

The present invention relates to an FPC having an FPC mounted with light emitting elements and drawn out through an FPC through hole provided in the lower cover, a protrusion disposed in the lower cover and supporting the FPC so as to be drawn out in a direction perpendicular to the side surface of the lower cover, And a guide holder provided with the guide holder.

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 improving degree of tightening according to a system connector fastening position by changing an FPC drawing structure of a light source array.

The liquid crystal display device has a large contrast ratio, and is suitable for gradation display and moving image display, and has a low power consumption.

Such a liquid crystal display device is divided into a liquid crystal display module (LCM) and a driving circuit section for driving the liquid crystal display module, and the liquid crystal display module is provided with liquid crystal cells And a backlight unit for applying light to the liquid crystal panel unit.

The liquid crystal panel part and the backlight part must be fastened together in an integrated form and protected by a case so as not to be damaged by an external impact.

The driving circuit unit is mounted on a printed circuit board (PCB) to drive the liquid crystal panel unit. At this time, an FPC (Flexible Printed Circuit) is used for connecting the liquid crystal panel unit and the printed circuit board, and the FPC is directly attached to the substrate of the liquid crystal panel unit and the PCB using a conductive resin or a connector.

The FPC has a structure in which a metallic conductive layer is inserted in a single layer or in multiple layers between flexible layers such as polyamide. Thus, control signals and DC voltages inputted from the outside through the signal lines mounted on the printed circuit board are transmitted to the liquid crystal panel unit.

Hereinafter, a liquid crystal display according to the related art will be described in detail.

1 is a perspective view of a back surface of a conventional liquid crystal display device.

2 is an enlarged perspective view of a back surface of a liquid crystal display according to the related art.

3 is a cross-sectional view of a part of the back surface of a liquid crystal display according to the related art.

4 is a perspective view of a back surface of a liquid crystal display device according to the related art, and is a perspective view schematically showing a state before attaching the blocking tape.

5 is a partially enlarged view of a rear perspective view of a conventional liquid crystal display device.

6 is an assembled cross-sectional view of the back surface of the liquid crystal display device taken along the line VI-VI of FIG.

1 to 3, the liquid crystal display according to the related art includes a liquid crystal panel 10 and a backlight unit (not shown) for providing light to the liquid crystal panel 10.

The backlight unit (not shown) includes a light guide plate 40 disposed under the liquid crystal panel 10, a light source array 60 disposed on one side of the light guide plate 40, A guide holder 70 disposed at a lower portion of the light guide plate 40 and an optical sheet 50 disposed between the guide holder 70 and the light source array 60 and the light guide plate 40 and optical sheets And a lower cover 80 in which the upper cover 50 and the like are accommodated and fixed.

A guide panel 30 for covering the lower cover 80 is disposed outside the lower cover 80 and a liquid crystal panel 10 is mounted on the upper surface thereof.

Although not shown, the liquid crystal panel 10 includes a color filter substrate having a color filter layer for color implementation, a TFT array substrate which is adhered to the color filter substrate and opposed to the color filter substrate, (Not shown), and a printed circuit board (PCB) is connected to the corner of the TFT array substrate to provide various control signals and data signals.

That is, although not shown in the figure, the TFT array substrate on which the thin film transistors are formed includes a data line for transmitting a video signal, a gate line for crossing the data line perpendicularly to define each pixel and transmitting a scanning signal, And a data line, and a pixel electrode formed in each pixel, wherein one end of the gate line and the data line are connected to a gate driving IC (not shown) and a data driving circuit.

The gate driving circuit (not shown) is connected to the FPC 62 by a LOG line (not shown), and the data driving circuit (not shown) is directly connected to the FPC 62, Lt; / RTI >

A printed circuit board (not shown) is electrically connected to the liquid crystal panel 10 to supply control signals and video signals of the driving integrated circuits. The printed circuit board is provided on the back side of the lower cover 80 by a double- And is fixed and fixed. At this time, an FPC 62 is connected between the printed circuit board (not shown) and the liquid crystal panel 10.

A plurality of light emitting devices 60 are mounted on a surface of the FPC 62 at a predetermined interval and a plurality of light emitting devices 60 are mounted on a light guide plate 40 of a backlight unit positioned below the liquid crystal panel 10 So as to face the light surface.

One end of the FPC 62 is bent to the backside of the lower cover 80 while protruding from the lower cover 80 through an FPC through hole 82 formed in the lower cover 80, (Not shown). At this time, the FPC 62 is disposed on the back surface of the lower cover 80 in a state where the FPC 62 is folded back toward the back side of the lower cover 80 by a cover shieding tape 64 attached thereto And is connected to a printed circuit board (not shown).

Particularly, the cover blocking tape 64 blocks the inflow of foreign matter into the LCD module through the FPC through-hole 82 of the lower cover 80.

However, since the FPC 62 is folded and fixed to the back side of the liquid crystal display module by the cover blocking tape 64 in a state of being drawn out of the liquid crystal display device module (LCM) It is impossible to fasten the FPC 62 according to the position of the system fastening portion of the fastening portion, and the degree of freedom of the fastening portion is limited. For example, when the position of the connector of the customer system is outside the LCD module, it is impossible to connect with the existing structure.

As shown in FIGS. 4 to 6, when the FPC 64 is pulled out through the FPC through-hole in the case of engaging with a specific customer system after removing the cover blocking tape 64, Difficulty occurs, and foreign matter flows through the FPC through hole.

Thus, in the FPC, the pull-out direction of the FPC in the state before attachment of the cover blocking tape is perpendicular to the back surface of the liquid crystal display module LCM.

Therefore, in the conventional structure in which the cover blocking tape is attached, since it can be fastened only in one direction, that is, only inside the back surface of the liquid crystal display device module (LCM), it is impossible to fasten outside the liquid crystal display module.

In order to fasten the FPC to a specific customer system, the cover blocking tape must be removed. Therefore, a separate fixing structure is required for bending the FPC outside the LCM module.

Therefore, when the FPC is bent to the outside of the LCD module LCM without a separate fixing structure, the restoring force of the FPC in the original direction is generated, so that the FPC can not be fastened to the specific system.

In order to fasten the FPC to a specific customer system, it is necessary to remove the cover blocking tape, so that foreign matter may flow into the liquid crystal display module through the FPC through hole provided in the lower cover.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal display device capable of improving the tightening degree according to the position of the system connector fastening by changing the FPC drawing structure.

According to one aspect of the present invention, there is provided an FPC comprising: an FPC mounted with light emitting devices and drawn out through an FPC through hole provided in the lower cover; And a guide holder having a protrusion for supporting the liquid crystal display panel so as to be drawn out in a direction perpendicular to the side surface of the liquid crystal display panel.

In the liquid crystal display device according to the present invention, the protruding portion of the guide holder can protrude to the side surface of the guide panel outside the FPC through hole.

In the liquid crystal display device according to the present invention, the cover blocking tape may be attached to the back surface and the side surface of the lower cover including the FPC through hole.

In the liquid crystal display device according to the present invention, the cover blocking tape may be attached to the lower cover so as to cover the FPC through hole.

In the liquid crystal display device according to the present invention, the FPC may be installed separately from the cover blocking tape.

In the liquid crystal display device according to the present invention, the cover blocking tape may include a lid part for blocking the FPC through hole and an FPC guide part from which the FPC is drawn out.

In the liquid crystal display device according to the present invention, the FPC guiding portion of the cover blocking tape may be composed of a side adhesive portion attached to the side surface of the lower cover and spaced apart from each other, and a guide groove provided between the side adhesive portions.

The liquid crystal display device according to the present invention can improve the degree of freedom of the lead-out portion of the FPC by supporting the FPC such that the FPC is pulled out of the liquid crystal display module through the FPC through-hole of the lower cover by using the guide holder having the projecting portion It can meet customers' specifications and improves system assembly defects.

In the present invention, since the cover blocking tape has to be removed at the time of bending to the outside of the conventional liquid crystal display module LCM, the FPC through hole is exposed to the outside, It is possible to bend the liquid crystal display module LCM outward by the protruding portion of the guide holder. Therefore, since the cover blocking tape is kept covered with the FPC through hole, the foreign matter inflow failure through the FPC through- .

1 is a perspective view of a back surface of a conventional liquid crystal display device.
2 is an enlarged perspective view of a back surface of a liquid crystal display according to the related art.
3 is a cross-sectional view of a part of the back surface of a liquid crystal display according to the related art.
4 is a perspective view of a back surface of a liquid crystal display device according to the related art, and is a perspective view schematically showing a state before attaching the blocking tape.
5 is a partially enlarged view of a rear perspective view of a conventional liquid crystal display device.
6 is an assembled cross-sectional view of the back surface of the liquid crystal display device taken along the line VI-VI of FIG.
7 is a perspective view of the back surface of the liquid crystal display device according to the present invention.
8 is an enlarged perspective view of a part of the back surface of the liquid crystal display device according to the present invention.
9 is a sectional view of a part of the back surface of the liquid crystal display device taken along line IX-IX of Fig.
10 is a perspective view of a back surface of a liquid crystal display device according to the present invention, and is a perspective view schematically showing a state before a blocking tape is attached.
11 is an assembled cross-sectional view of the back surface of the liquid crystal display device taken along the line XI-XI in Fig.
12 is an enlarged cross-sectional view of part A of Fig.
13 is a schematic perspective view of a guide holder according to the present invention.
14 is an enlarged perspective view of part B of Fig.

Hereinafter, a liquid crystal display according to the present invention will be described in detail with reference to the accompanying drawings.

7 is a perspective view of the back surface of the liquid crystal display device according to the present invention.

8 is an enlarged perspective view of a part of the back surface of the liquid crystal display device according to the present invention.

9 is a sectional view of a part of the back surface of the liquid crystal display device taken along line IX-IX of Fig.

10 is a perspective view of a back surface of a liquid crystal display device according to the present invention, and is a perspective view schematically showing a state before a blocking tape is attached.

7 to 9, the liquid crystal display device according to the present invention includes a liquid crystal panel 110 and a backlight unit (not shown) in which an image is displayed, and includes a liquid crystal panel 110 and a backlight unit And a guide panel 130 for modularizing the display panel.

The liquid crystal panel 110 is placed on the upper surface of the guide panel 130 and a lower cover 180 is placed under the liquid crystal panel 110 and is fixed by being wrapped by the guide panel 130 do.

A plurality of light emitting devices 160, a light guide plate 140 and an optical sheet 150 are received and fixed to the lower cover 180 and an FPC through hole 182 is provided at one side thereof.

An FPC (Flexible Printed Circuit) 162 having a plurality of light emitting devices 160 mounted on one side of the lower cover 180 is disposed on one side of the lower cover 180. The FPC 162 is mounted on the lower cover 180, Through the FPC through hole 182 provided in the FPC.

The lower cover 162 is provided with a guide holder 170 having a protrusion 172 for supporting the FPC 162 in a direction perpendicular to the side surface of the lower cover 180.

A liquid crystal display having such a structure will be described in more detail as follows.

The liquid crystal display device according to the present invention comprises a liquid crystal panel 110 and a backlight unit (not shown) in which an image is displayed and includes a guide panel 130 for modulating the liquid crystal panel 110 and a backlight unit (not shown) And a case top 190 surrounding the top edge of the liquid crystal panel 110 and the guide panel 130.

The liquid crystal panel 110 is a part that plays a key role in image display and includes a first substrate 112 and a second substrate 114 which are bonded to each other with a liquid crystal layer (not shown) interposed therebetween.

Although not shown in the drawings, the inner surface of the first substrate 112, which is usually called an upper substrate or a color filter substrate, includes red (R), green (G), blue (B) And a black matrix covering the gate lines, the data lines, and the thin film transistors. Further, a color filter of red (R), green (G), and blue (B) colors and a transparent common electrode covering the black matrix are provided.

A plurality of gate lines and data lines cross each other on the inner surface of a first substrate 114 called a lower substrate or an array substrate, pixels are defined, and a thin film transistor (TFT) And are connected in a one-to-one correspondence with the transparent pixel electrodes formed in the respective pixels.

Polarizing plates 116 and 118 for selectively transmitting only specific light are attached to the outer surfaces of the first and second substrates 112 and 114, respectively.

In addition, the second substrate 114 is further provided with a pad region, that is, a pad portion (not shown) as compared with the first substrate 112, so that the area of one edge is larger.

Therefore, a driving circuit (not shown) for applying a signal to a plurality of gate lines and data lines is constituted by pad portions which are one edge of the second substrate 114.

This structure is referred to as a COG (Chip on Glass) type liquid crystal panel 110. The COG method is a method of directly bonding a driving circuit on a second substrate 114 using an anisotropic conductive film The liquid crystal panel 110 has an advantage that the proportion of the liquid crystal panel 110 occupied by the liquid crystal display device can be increased.

The driving circuit is a plurality of gates and data driving circuits, and each of the gates and the data driving circuit is connected to a gate and a data line (not shown) on the second substrate 114, respectively.

The gate and the data driving circuit are connected to the FPC 162 which outputs various signal voltages.

A plurality of wiring patterns (not shown) connected to the data and gate driving circuits are aligned to one side edge of the FPC 162 and bonded to the liquid crystal panel 110 via an anisotropic conductive film (not shown).

When the thin film transistor selected for each gate line is turned on by the on / off signal of the gate driving circuit, the liquid crystal panel 110 transmits the signal voltage of the data driving circuit to the corresponding pixel electrode through the data line, The arrangement direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode to show a difference in transmittance.

A backlight unit (not shown) for supplying light to the back surface of the liquid crystal panel 110 is provided so that the difference in transmittance of the liquid crystal panel 110 is externally expressed.

The backlight unit (not shown) is disposed below the liquid crystal panel 110 and serves to provide light to the liquid crystal panel 110.

The backlight unit (not shown) includes a lower cover 180, a plurality of light emitting devices 160 disposed on one side of the lower cover 180, a light guide plate 140 disposed adjacent to the light emitting device 160, An optical sheet 150 disposed on the light guide plate 140 and a reflective sheet 142 disposed under the light guide plate 140.

The light emitting device 160 may be an R, G, B light emitting diode that emits red light, G (green), or B (blue) monochromatic light, or a light emitting diode that emits white light. View) type device can be used.

When a light emitting device that emits monochromatic light is used, monochromatic light emitting devices of R, G, and B are alternately arranged at regular intervals, monochromatic light emitted therefrom is mixed with white light, and then supplied to the liquid crystal panel 110 . Alternatively, when a light emitting device that emits white light is used, a plurality of light emitting devices may be arranged at a predetermined interval to supply white light to the liquid crystal panel 110. [

For example, a white light emitting device is composed of a blue light emitting device that emits blue light and a phosphor that emits yellow light by absorbing blue monochromatic light. The blue monochromatic light output from the blue light emitting device and the yellow monochromatic light emitted by the phosphor Light can be mixed and supplied to the liquid crystal panel 110 as white light.

Although the light emitting devices are disposed on one side of the light guide plate 140 as a side type backlight unit in the drawing, the light emitting devices may be disposed on the other side of the light guide plate 140, Can be applied.

Although a light emitting element is used as a light source, the present invention is not limited thereto, and various light sources that generate light such as a cold cathode fluorescent lamp can be used.

The light guide plate (LGP) 140 guides the light emitted from the light emitting devices 160 to the liquid crystal panel 110. The light incident on one side of the light guide plate 140 is refracted and reflected repeatedly by the diffuser added to the inside of the light guide plate 140 to advance to the other side and then emitted to the upper side of the light guide plate 140. That is, the light guide plate 140 serves to change the light having the optical distribution in the form of a point light source or a linear light source into light having an optical distribution in the form of a surface light source.

The reflective sheet 142 is disposed under the light guide plate 140 and reflects light emitted from the light guide plate 140 to the lower side in the direction of the liquid crystal panel 110. The reflection sheet 142 can adjust the reflection amount of the entire incident light so that the entire light outputting surface has a uniform luminance distribution.

The optical sheet 140 includes a diffusion sheet (not shown) for diffusing the light emitted from the light guide plate 140 and a light diffusion sheet (not shown) for condensing the light diffused by the diffusion sheet A plurality of prism sheets (not shown) for supplying uniform light to the entire area of the panel 110, and the like.

The diffusing sheet is usually provided with one sheet, but the prism sheet may include a first prism sheet and a second prism sheet in which the prisms intersect perpendicularly in the X and Y axis directions. The first prism sheet and the second prism sheet can refract light in the X and Y axis directions to improve the straightness of light.

A pattern (not shown) may be formed on one surface of the prism sheet to more evenly distribute the brightness of the light. The shape of the pattern may be various shapes such as an acid, a hemisphere, and a polygon.

A guide panel 130 is disposed on the outer side of the lower cover 180 to surround the lower cover and an edge of the liquid crystal panel 110 is disposed on the upper surface of the guide panel 130.

The FPC connection structure of the liquid crystal display device will be described in detail with reference to the accompanying drawings.

As shown in FIG. 9, the FPC 162 of the present invention is bent to the outside of the liquid crystal display device in the modularization process of the liquid crystal display device and is fastened to the external system.

A plurality of light emitting devices 160 are mounted on a surface of the FPC 162 at a predetermined interval and a plurality of light emitting devices 160 are mounted on a light guide plate 140 of a backlight unit positioned below the liquid crystal panel 110 So as to face the light surface.

10, one end of the FPC 162 protrudes to the outside of the lower cover 180 through the FPC through hole 182 formed in the lower cover 180. As shown in FIG.

The lower cover 162 is provided with a guide holder 170 having a protrusion 172 for supporting the FPC 162 in a direction perpendicular to the side surface of the lower cover 180. The protrusion 172 of the guide holder 170 protrudes to the side of the guide panel 130 outside the FPC through hole 182 and is arranged to support and fix the FPC 162.

The FPC 162 is moved to the outside of the LCD module through the FPC through hole 182 of the lower cover 180 by using the guide holder 170 having the protrusion 172 ), It is possible to improve the degree of freedom of the lead-out portion of the FPC 162 to meet the specifications of the customer, and to improve the defective system assembly.

A cover shielding tape 164 is attached to the back and sides of the lower cover 180 including the FPC through holes 182. At this time, the cover blocking tape 184 is attached to the back surface of the lower cover 180 so as to cover the FPC through hole 182. Particularly, the FPCs 162 are disposed separately and independently without interference from the cover blocking tape 164. Therefore, the cover blocking tape 164 covers the FPC through hole 182 of the lower cover 180, thereby blocking foreign matter from entering the LCD module through the FPC through hole 182.

8 and 9, the cover blocking tape 164 includes a lid portion 164a for blocking the FPC through hole 182 and an FPC guide portion 164b to which the FPC 162 is drawn . At this time, the FPC guide portion 164b of the cover blocking tape 164 is attached to the side surface of the lower cover 180 and includes side adhesive portions (not shown) spaced from each other and guide grooves (not shown) ).

The FPC 162 bent to the outside of the liquid crystal display device by the projecting portion 172 of the guide holder 170 with the cover blocking tape 164 attached to the back surface and the side surface of the lower cover 180, (Not shown) of the FPC guide portion 164b.

The structure of the liquid crystal display device in which the FPC is drawn out when the cover blocking tape is not attached to the bottom surface of the lower cover will be described with reference to FIGS. 11 to 14 as follows.

Fig. 11 is an engagement sectional view of the back surface of the liquid crystal display device taken along the line XI-XI of Fig. 10, and Fig. 12 is an enlarged sectional view of the A portion of Fig.

FIG. 13 is a perspective view schematically showing a guide holder according to the present invention, and FIG. 14 is an enlarged perspective view of part B of FIG.

As shown in FIGS. 11 to 12, as in FIG. 9, the FPC 162 of the present invention is bent to the outside of the liquid crystal display device in the modularization process of the liquid crystal display device and is fastened to the external system.

A plurality of light emitting devices 160 are mounted on a surface of the FPC 162 at a predetermined interval and a plurality of light emitting devices 160 are mounted on a light guide plate 140 of a backlight unit positioned below the liquid crystal panel 110 So as to face the light surface.

One end of the FPC 162 protrudes from the bottom of the bottom cover 180 through the FPC through hole 182 formed in the bottom cover 180,

13 and 14, the lower cover 162 includes a guide holder 172 having a protrusion 172 for supporting the FPC 162 to be drawn out in a direction perpendicular to the side surface of the lower cover 180, (Not shown). The protrusion 172 of the guide holder 170 protrudes to the side of the guide panel 130 outside the FPC through hole 182 and is arranged to support and fix the FPC 162.

As described above, the liquid crystal display according to the present invention supports and fixes the FPC so that the FPC can be pulled out of the liquid crystal display module through the FPC through hole of the lower cover by using the protrusion provided in the guide holder, The degree of freedom of the lead-out portion of the lead-out portion can be improved to meet the specification of the customer, and the defective system assembly can be improved.

In the present invention, since the cover blocking tape has to be removed at the time of bending to the outside of the conventional liquid crystal display module LCM, the FPC through hole is exposed to the outside, Since the cover block tape is kept covered with the FPC through hole because bending of the liquid crystal display module LCM can be performed by the protruding portion of the guide holder without interference, foreign matter inflow failure through the FPC through- .

Although the embodiments have been described with reference to the drawings, the present invention is not limited thereto.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

110: liquid crystal panel 130: guide panel
140: light guide plate 160: light emitting element
162: FPC (Flexible Printed Circuit) 164: cover blocking tape
164a: lid part 164b: FPC guide part
170: guide holder 172: projection
180: Lower cover

Claims (7)

A liquid crystal panel displaying an image;
A guide panel on which the liquid crystal panel is placed;
A lower cover disposed under the liquid crystal panel and being wrapped and fixed by the guide panel;
A plurality of light emitting devices housed in the lower cover, a light guide plate and an optical sheet;
An FPC mounted with the light emitting elements and drawn out to the outside through an FPC through hole provided in the lower cover; And
And a guide holder disposed in the lower cover and having a protrusion for supporting the FPC to be drawn out in a direction perpendicular to a side surface of the lower cover. The liquid crystal display of claim 1, wherein the protruding portion of the guide holder protrudes to a side surface of the guide panel outside the FPC through hole. The liquid crystal display of claim 1, wherein a cover blocking tape is attached to a back surface and a side surface of the lower cover including the FPC through hole. The liquid crystal display of claim 1, wherein the cover blocking tape is attached to the lower cover so as to cover the FPC through hole. The liquid crystal display of claim 1, wherein the FPC is independently supported by the projecting portion of the guide holder without interfering with the cover blocking tape. The liquid crystal display of claim 1, wherein the cover blocking tape comprises a lid part for blocking the FPC through hole and an FPC guiding part from which the FPC is drawn out. The liquid crystal display of claim 1, wherein the FPC guiding portion of the cover blocking tape comprises a side adhesive portion attached to a side surface of the lower cover and spaced apart from each other, and a guide groove provided between the side adhesive portions.

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