KR102575520B1 - Liquid crystal display device - Google Patents

Abstract

The present invention provides a liquid crystal display device including a driving PCB connected to a liquid crystal panel, and a PCB fixing bracket protruding from a lower cover disposed below the liquid crystal panel and having a PCB accommodating part. The present invention is provided with a PCB fixing bracket protruding from the lower cover disposed below the liquid crystal panel and having a PCB accommodating portion, such as line defects and falling off of fixing tape that may occur when attaching the PCB. It is possible to improve the defect of .

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

The present invention relates to a display device, and more particularly, to a liquid crystal display device having a structure for fixing a printed circuit board (PCB).

In general, liquid crystal display devices tend to have a wider range of applications due to features such as light weight, thinning, low power consumption driving, and the like. Accordingly, liquid crystal display devices are progressing in the direction of larger area, thinner shape, and lower power consumption in response to user's needs.

A liquid crystal display device is a display device that displays an image by controlling the amount of light passing through a liquid crystal, and is widely used due to advantages such as thinning and low power consumption.

The liquid crystal display device includes a gate driving PCB (not shown) mounted with a gate driver for supplying signals to gate wiring (not shown) in a liquid crystal panel, and a data driving PCB (not shown) for supplying data signals to data wiring (not shown). not shown) is provided.

The gate driving PCB and the data driving PCB are electrically connected to a liquid crystal panel (not shown) by a COF (Chip On Film) connected to an edge of the liquid crystal display.

Both sides of the edge of the driving PCB (not shown) are coupled to the PCB fixing part provided on the side of the lower cover (not shown) by means of screws or fixing tape.

In particular, in the case of a conventional flat notebook model, a driving PCB is grounded to a bracket of a cover bottom in order to avoid electrostatic (ESD) defects of circuit components.

As such, conventionally, a screw or a fixing tape is used to fix the driving PCB in order to ground the driving PCB to a bracket of a cover bottom.

However, when the driving PCB is fixed using screws, a line defect may occur during a test in which a product user opens and closes the product.

In addition, when the drive PCB is fixed to the bracket using a fixing tape, the fixing tape may fall off when the drive PCB and the bracket are attached, resulting in a ground failure.

An object of the present invention is to provide a liquid crystal display device capable of improving defects such as a line defect and falling off of a fixing tape that may occur when attaching a PCB.

In order to solve the above problems, in one aspect, the present invention is a liquid crystal display including a driving PCB connected to a liquid crystal panel, and a PCB fixing bracket protruding from a lower cover disposed below the liquid crystal panel and having a PCB accommodating portion. device can be provided.

In such a liquid crystal display device, the PCB fixing bracket may protrude and extend from one side of the lower cover.

In such a liquid crystal display device, the PCB accommodating part may be provided at one end of the PCB fixing bracket.

In such a liquid crystal display device, the PCB accommodating portion may include a lower horizontal portion, an upper horizontal portion, and a side portion connecting the lower horizontal portion and the upper horizontal portion.

In such a liquid crystal display device, a part of the driving PCB may be accommodated in the PCB accommodating part.

In such a liquid crystal display device, PCB grounding areas may be provided on the upper and lower surfaces of the driving PCB in contact with the PCB fixing bracket.

In such a liquid crystal display device, one of metal materials including gold (Au) may be selected and used as the PCB ground area.

In such a liquid crystal display device, a plurality of concave and convex structures may be provided on an inner surface of an upper horizontal portion of the PCB accommodating portion.

In such a liquid crystal display device, a plurality of embossing structures may be provided on the inner surface of the upper horizontal portion of the PCB accommodating portion.

In such a liquid crystal display device, the upper horizontal portion of the PCB accommodating portion may be formed in a clip type structure.

Since the present invention can seat and fix the drive PCB to the "c" shaped PCB accommodating part provided in the PCB fixing bracket, a separate structure for fixing the PCB, for example, a screw or fixing previously used No need for fixing tape.

Therefore, in the present invention, since the drive PCB can move in the PCB accommodating part of the PCB fixing bracket, line defects or line defects caused by screws or fixing tapes previously used to fix the PCB A defect in which the fixing tape falls can be prevented.

In addition, the present invention eliminates the need for screws or fixing tapes used to fix the PCB, thereby reducing the fixing cost of the screws or tapes for fixing the PCB.

Moreover, since the PCB grounding area is formed on the upper and lower surfaces of the drive PCB that are in contact with the PCB fixing bracket, the PCB grounding area is enlarged compared to the prior art, thereby securing stability against external static electricity defects.

1 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.
2 is a cross-sectional view of a liquid crystal display device according to an embodiment of the present invention, schematically showing a state in which a driving PCB is inserted into and fixed to a PCB fixing bracket of a lower cover.
3 is a plan view of a liquid crystal display device according to an embodiment of the present invention, schematically showing a state in which a driving PCB is fixed to a PCB fixing bracket.
4 is an enlarged perspective view of a lower cover of a liquid crystal display device according to an embodiment of the present invention, and is a view showing a PCB fixing bracket provided on one side of the lower cover.
FIG. 5 is a cross-sectional view of the lower cover and the PCB fixing bracket taken along the line A-A′ of FIG. 4, and is a combined cross-sectional view showing the PCB fixed in the PCB fixing bracket of the lower cover.
6 is a cross-sectional view of a PCB fixing bracket of a liquid crystal display device according to another embodiment of the present invention.
7 is a cross-sectional view of a PCB fixing bracket of a liquid crystal display according to another embodiment of the present invention.
8 is a cross-sectional view of a PCB fixing bracket of a liquid crystal display according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, the same numerals are used as much as possible even if they are displayed on different drawings for the same components.

You have to keep in mind that you have to. In addition, in describing the embodiments of the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

Also, terms such as first, second, A, B, (a), and (b) may be used in describing the components of the invention. These terms are only used to distinguish the component from other components, and the nature, order, or order of the corresponding component is not limited by the term. When an element is described as being “connected,” “coupled to,” or “connected” to another element, that element is or may be directly connected to the other element, but there is another element between the elements. It will be understood that elements may be “connected”, “coupled” or “connected”. In the same vein, when a component is described as being formed “on” or “below” another component, that component is formed either directly by the other component or indirectly through another component. It should be understood as including

The present invention takes a liquid crystal display device (LCD) as an example among display devices.

Although it will be described, it is not limited thereto, and can be applied to organic light emitting diode display devices (OLEDs), flat panel display devices, electrophoretic display devices, etc. in addition to liquid crystal display devices (LCDs). Let's make it clear that this is possible.

1 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.

2 is a cross-sectional view of a liquid crystal display device according to an embodiment of the present invention, schematically showing a state in which a driving PCB is inserted into and fixed to a PCB fixing bracket of a lower cover.

3 is a plan view of a liquid crystal display device according to an embodiment of the present invention, schematically showing a state in which a driving PCB is fixed to a PCB fixing bracket.

4 is an enlarged perspective view of a lower cover of a liquid crystal display device according to an embodiment of the present invention, and is a view showing a PCB fixing bracket provided on one side of the lower cover.

FIG. 5 is a cross-sectional view of the lower cover and the PCB fixing bracket taken along the line A-A′ of FIG. 4, and is a combined cross-sectional view showing the PCB fixed in the PCB fixing bracket of the lower cover.

6 is a cross-sectional view of a PCB fixing bracket of a liquid crystal display device according to another embodiment of the present invention.

7 is a cross-sectional view of a PCB fixing bracket of a liquid crystal display according to another embodiment of the present invention.

8 is a cross-sectional view of a PCB fixing bracket of a liquid crystal display according to another embodiment of the present invention.

As shown in FIGS. 1 and 2 , the liquid crystal display device 100 according to an embodiment of the present invention includes a liquid crystal panel 110 on which an image is displayed and disposed below the liquid crystal panel 110 to provide light. It includes a backlight unit 120 to.

As shown in FIGS. 1 and 2 , the liquid crystal panel 110 includes a color filter substrate 110a and a thin film transistor (TFT) substrate 110b that face each other and are bonded to each other to maintain a uniform cell gap, A liquid crystal layer (not shown) is interposed between the two substrates, and an upper polarizer 111a and a lower polarizer 111b are respectively attached to outer surfaces of the color filter substrate 110a and the thin film transistor substrate 110b.

Although not shown in the drawings, a plurality of gate wires are formed on the thin film transistor substrate 110a, and a plurality of gate wires are formed crossing the plurality of gate wires, and the thin film transistor is formed in an intersection area between the gate wires and the data wires. (TFT) is formed.

In addition, at the edge of the liquid crystal panel 110, a gate driving PCB (gate driving printed circuit board, 115) for supplying a scan signal to the gate wiring, and a data driving PCB (data driving printed circuit board, supplying a data signal to the data wiring) not shown) is provided. At this time, in the present invention, the gate driving PCB and the data driving PCB are commonly referred to as the driving PCB 115 and used.

The driving PCB 115 is electrically connected to the liquid crystal panel 110 through a tape carrier package (TCP) 113.

The backlight unit 120 includes a lower cover 180 having an open upper surface, a light source unit 150 provided with at least one light source 151 on an inner side surface of the lower cover 180, and the light source unit 150. A light guide plate 160 disposed in parallel with the light guide plate 160 to convert light incident from the light sources 151 into surface light, an optical sheet 140 disposed on the light guide plate 160 to condense and diffuse light, and a lower cover. A reflection sheet 170 is disposed on an inner bottom surface of the 180 to reflect the light emitted from the light guide plate 160 and guide it to the liquid crystal panel 110 .

The backlight unit 120 further includes a panel guide 130 accommodated inside the lower cover 180 and accommodating the light source unit 150, the light guide plate 160, the reflective sheet 170, and the optical sheets 140. include

In addition, the light guide plate 160 is made of poly methyl methacrylate (PMMA), and although not shown in detail in the drawing, it may be formed in a wedge shape in which the thickness decreases as the distance from the incident surface where the light source unit 150 is disposed increases. A prism pattern may be formed on the rear surface of the light guide plate 160 to refract incident light toward the optical sheets 140 .

The optical sheets 140 include a diffusion sheet for diffusing light, a light-collecting sheet for condensing light, and a protective sheet for protecting the light-collecting sheet.

Further, the light source unit 150 includes light sources 151 composed of light emitting diodes (LEDs) as point light sources in addition to the lamps, and the light sources 151 to guide the light emitted from the light sources 151 toward the light guide plate 160. It includes a board 153 to be mounted.

3 is a plan view of a liquid crystal display device according to an embodiment of the present invention, schematically showing a state in which a driving PCB is fixed to a PCB fixing bracket.

4 is an enlarged perspective view of a lower cover of a liquid crystal display device according to an embodiment of the present invention, and is a view showing a PCB fixing bracket provided on one side of the lower cover.

FIG. 5 is a cross-sectional view of the lower cover and the PCB fixing bracket taken along the line A-A′ of FIG. 4, and is a combined cross-sectional view showing the PCB fixed in the PCB fixing bracket of the lower cover.

As shown in FIGS. 3 to 5 , PCB fixing brackets 190 are provided on both sides of one side of the lower cover 180 to fix the driving PCB 113 connected to the liquid crystal panel 110 .

The PCB fixing bracket 190 protrudes from the side of the lower cover 180 and extends.

In addition, the PCB fixing bracket 190 includes a lower horizontal part 191 on which the driving PCB 115 is seated, an upper horizontal part 195 spaced apart from the lower horizontal part 191 by a predetermined distance and facing each other, and a lower horizontal part 195 facing each other. A side part 193 connecting the part 191 and the upper horizontal part 191, and a "c" shaped PCB provided between the lower horizontal part 191, the upper horizontal part 195 and the side part 193 A storage unit 197 is included.

As shown in FIGS. 4 and 5, the PCB fixing bracket 190 is bent in a state where the incised portion on both sides of one side of the lower cover 180 protrudes to the outside, and at one end of the PCB accommodating portion ( 197) is provided. At this time, the PCB fixing bracket 190 is integrally formed with the lower cover 180.

In addition, cutouts 181 are formed on both sides of one side of the lower cover 180 . In particular, the cutout 181 may be formed due to the PCB fixing bracket 190 protruding from one side of the lower cover 180 .

Meanwhile, as shown in FIG. 5 , the driving PCB 115 is inserted and fixed into the PCB accommodating part 197 of the PCB fixing bracket 190 .

Therefore, since the drive PCB 115 can be inserted into and fixed to the "c" shaped PCB accommodating part 197 provided in the PCB fixing bracket 190, a separate structure for fixing the PCB, for example, the existing The screw or fixing tape used can be omitted.

In addition, since the driving PCB 115 is movable in the PCB accommodating part 197 of the PCB fixing bracket 190, wiring caused by screws or fixing tapes that have been used to fix the PCB in the past It can prevent a line defect or a defect where the fixing tape falls off.

On the other hand, as shown in FIG. 5, the upper and lower surfaces of the driving PCB 115 in contact with the lower horizontal portion 191 and the upper horizontal portion 195 constituting the PCB accommodating portion 197 are PCB ground areas ( 117) is formed. In particular, the PCB ground area 117 may be formed by selecting among metal materials including gold (Au).

Therefore, since the PCB grounding area 117 is formed on the upper and lower surfaces of the driving PCB 115 in contact with the PCB fixing bracket 190, the PCB grounding area 117 is enlarged compared to the conventional one, thereby providing stability against external static electricity defects. can be obtained. That is, since static electricity (ESD) escapes to the lower cover 180 through the PCB fixing bracket 190 by the PCB grounding area 117, stability against external static electricity defects is secured.

Meanwhile, other embodiments of the PCB fixing bracket of the liquid crystal display device according to the present invention will be described with reference to FIGS. 6 to 8.

6 is a cross-sectional view of a PCB fixing bracket of a liquid crystal display device according to another embodiment of the present invention.

As shown in FIG. 6 , the PCB fixing bracket 290 of the liquid crystal display according to another embodiment of the present invention protrudes and extends from the side of the lower cover (not shown, see 180 in FIG. 5 ).

The PCB fixing bracket 290 includes a lower horizontal portion 291 on which a driving PCB (not shown, see 115 in FIG. 1) is seated, and an upper horizontal portion 295 spaced apart from the lower horizontal portion 291 by a predetermined distance and facing each other. ), the side portion 293 connecting the lower horizontal portion 291 and the upper horizontal portion 291, and the "c" provided between the lower horizontal portion 291, the upper horizontal portion 295, and the side portion 293. "Including a PCB accommodating portion 297 in the shape of a ruler.

In addition, on the inner surface of the upper horizontal portion 295, a plurality of convex portions for fixing with flexibility in the state in which the driving PCB 115 connected to the liquid crystal panel (not shown) by the TCP 113 is inserted. A portion 295a and a concave portion 295b are provided.

Therefore, in this case, as in one embodiment of the present invention, the upper horizontal portion ( 295) A plurality of convex portions 295a provided on the inner surface contact the upper surface of the driving PCB 115 and press and fix the driving PCB 115, thereby fixing the PCB. A screw or fixing tape may be omitted.

In addition, since the driving PCB 115 is movable in the PCB accommodating part 297 of the PCB fixing bracket 290, wiring caused by screws or fixing tapes previously used to fix the PCB It can prevent a line defect or a defect where the fixing tape falls off.

On the other hand, although not shown in the drawing, the upper and lower surfaces of the driving PCB 115 in contact with the lower horizontal part 291 and the upper horizontal part 295 constituting the PCB accommodating part 297 have PCB grounding areas (not shown). ) can be formed. At this time, the PCB ground area (not shown) may be configured by selecting among metal materials including gold (Au).

Therefore, since the PCB grounding area (not shown) is formed on the upper and lower surfaces of the drive PCB 115 in contact with the PCB fixing bracket 290, the PCB grounding area (not shown) is enlarged compared to the conventional one, thereby preventing external static electricity defects. stability can be obtained. That is, since static electricity (ESD) escapes to the lower cover (not shown, see FIG. 5 180) through the PCB fixing bracket 290 by the PCB grounding area (not shown), stability against external static electricity failure can be secured. .

Meanwhile, FIG. 7 is a cross-sectional view of a PCB fixing bracket of a liquid crystal display device according to another embodiment of the present invention.

As shown in FIG. 7 , the PCB fixing bracket 390 of the liquid crystal display device according to another embodiment of the present invention protrudes and extends from the side of the lower cover (not shown, see 180 in FIG. 5 ).

The PCB fixing bracket 390 includes a lower horizontal portion 391 on which a driving PCB (not shown, see 115 in FIG. 1) is seated, and an upper horizontal portion 395 spaced apart from the lower horizontal portion 391 by a predetermined interval and facing each other. ), the side part 393 connecting the lower horizontal part 391 and the upper horizontal part 391, and the "c" provided between the lower horizontal part 391, the upper horizontal part 395 and the side part 393. "Including a PCB accommodating portion 397 in the shape of a ruler.

In addition, on the inner surface of the upper horizontal part 395, a plurality of embossings are applied so that the driving PCB 115 connected to the liquid crystal panel (not shown) by the TCP 113 can be fixed with flexibility in the inserted state. (395a) structure is provided.

Therefore, in this case, as in one embodiment of the present invention, the upper horizontal part in a state in which the driving PCB 115 is inserted into the "c" shaped PCB accommodating part 397 provided in the PCB fixing bracket 390 A plurality of embossings 395a provided on the inner surface of 395 press and fix the upper surface of the driving PCB 115, thereby fixing a separate structure for fixing the PCB, for example, a screw or fixing tape previously used. (fixing tape) can be omitted.

In addition, since the driving PCB 115 can move in the PCB accommodating part 397 of the PCB fixing bracket 390, wiring caused by screws or fixing tapes that have been used to fix the PCB in the past. It can prevent a line defect or a defect where the fixing tape falls off.

On the other hand, although not shown in the drawing, the upper and lower surfaces of the driving PCB 115 in contact with the lower horizontal part 391 and the upper horizontal part 395 constituting the PCB accommodating part 397 have PCB grounding areas (not shown). ) can be formed. At this time, the PCB ground area (not shown) may be configured by selecting among metal materials including gold (Au).

Therefore, since the PCB grounding area (not shown) is formed on the upper and lower surfaces of the driving PCB 115 in contact with the PCB fixing bracket 390, the PCB grounding area (not shown) is enlarged compared to the conventional one, thereby preventing external static electricity defects. stability can be obtained. That is, since static electricity (ESD) escapes to the lower cover (not shown, see FIG. 5 180) through the PCB fixing bracket 390 by the PCB grounding area (not shown), stability against external static electricity failure can be secured. .

Meanwhile, FIG. 8 is a cross-sectional view of a PCB fixing bracket of a liquid crystal display device according to another embodiment of the present invention.

As shown in FIG. 8 , a PCB fixing bracket 490 of a liquid crystal display device according to another embodiment of the present invention protrudes and extends from a side surface of a lower cover (not shown, see 180 in FIG. 5 ).

The PCB fixing bracket 490 includes a lower horizontal portion 491 on which a driving PCB (not shown, see 115 in FIG. 1 ) is seated, and an upper horizontal portion 495 spaced apart from the lower horizontal portion 491 by a predetermined interval and facing each other. ), the side part 493 connecting the lower horizontal part 491 and the upper horizontal part 491, and the "c" provided between the lower horizontal part 491, the upper horizontal part 495 and the side part 493. "Including a PCB accommodating portion 497 in the shape of a ruler.

Also, a clip is provided on the inner surface of the upper horizontal portion 495 so that the driving PCB 115 connected to the liquid crystal panel (not shown) by the TCP 113 can be fixed with flexibility in the inserted state. ) structure 495a is provided.

Therefore, in this case, as in one embodiment of the present invention, the upper horizontal portion in a state in which the drive PCB 115 is inserted into the "c" shaped PCB accommodating portion 497 provided in the PCB fixing bracket 490 The clip structure 495a provided on the inner surface of the 495 presses and fixes the upper surface of the driving PCB 115 with a predetermined force, so that a separate structure for fixing the PCB, for example, a screw previously used Alternatively, the fixing tape may be omitted.

In addition, since the driving PCB 115 is movable in the PCB accommodating part 497 of the PCB fixing bracket 490, wiring caused by screws or fixing tapes used to fix the PCB in the past It can prevent a line defect or a defect where the fixing tape falls off.

On the other hand, although not shown in the drawing, the upper and lower surfaces of the drive PCB 115 in contact with the lower horizontal portion 491 and the upper horizontal portion 495 constituting the PCB accommodating portion 497 have PCB grounding areas (not shown). ) can be formed. At this time, the PCB ground area (not shown) may be configured by selecting among metal materials including gold (Au).

Therefore, since the PCB grounding area (not shown) is formed on the upper and lower surfaces of the driving PCB 115 in contact with the PCB fixing bracket 490, the PCB grounding area (not shown) is enlarged compared to the conventional one, thereby preventing external static electricity defects. stability can be obtained. That is, since static electricity (ESD) escapes to the lower cover (not shown, see FIG. 5 180) through the PCB fixing bracket 490 by the PCB grounding area (not shown), stability against external static electricity failure can be secured. .

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

Terms such as "comprise", "comprise" or "having" described above mean that the corresponding component may be inherent unless otherwise stated, and therefore do not exclude other components. It should be construed that it may further include other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless defined otherwise. Commonly used terms, such as terms defined in a dictionary, should be interpreted as being consistent with the contextual meaning of the related art, and unless explicitly defined in the present invention, they are not interpreted in an ideal or excessively formal meaning.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

110: liquid crystal panel 113: TCP (Tape Carrier Package)
115: drive PCB 117: PCB ground area
180: lower cover 190: PCB fixing bracket
191: lower horizontal part 193: side part
195: upper horizontal part 197: PCB receiving part

Claims (11)

liquid crystal panel;
a lower cover disposed below the liquid crystal panel;
a driving PCB connected to the liquid crystal panel;
a PCB fixing bracket protruding from the lower cover disposed below the liquid crystal panel and having a PCB accommodating portion; and
A partial region of the lower cover includes a cutout portion,
The PCB accommodating part of the PCB fixing bracket includes a lower horizontal part protruding from the lower cover and parallel to the upper surface of the liquid crystal panel, an upper horizontal part disposed horizontally opposite to the lower horizontal part at a predetermined interval, and the lower horizontal part. It consists of a side part connecting the part and the upper horizontal part,
The lower horizontal part, the upper horizontal part and the side part of the PCB fixing bracket are formed by bending the cutout outward from the lower cover,
The liquid crystal display device in which the driving PCB is inserted into and fixed to the PCB receiving part. delete delete delete The liquid crystal display device of claim 1 , wherein PCB grounding areas are formed on upper and lower surfaces of the driving PCB that contact the PCB fixing bracket. 6. The liquid crystal display device of claim 5, wherein the PCB ground area is selected from metal materials including gold (Au). The liquid crystal display device of claim 1 , wherein a plurality of concave and convex structures are provided on an inner surface of an upper horizontal portion of the PCB accommodating portion. The liquid crystal display device according to claim 1, wherein a plurality of embossed structures are formed on an inner surface of an upper horizontal portion of the PCB accommodating portion. The liquid crystal display device of claim 1 , wherein a clip structure is formed on an inner surface of an upper horizontal portion of the PCB accommodating portion. The liquid crystal display device of claim 1 , wherein the driving PCB moves within the PCB accommodating part of the PCB fixing bracket.
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