KR20080042191A - Liquid crystal display - Google Patents

Abstract

An LCD is provided to dispose a panel board assembly in a side of an LCD panel, thereby reducing its thickness and blocking electromagnetic waves. An LCD comprises the following parts. An LCD(Liquid Crystal Display) panel(200) displays images. A backlight unit(1000) supplies light to the LCD panel. A first panel board assembly(223) supplies a signal by being connected to the LCD panel, and disposed in a side of the LCD panel. The first panel board assembly is bent in a direction of the backlight unit. The first panel board assembly is wound in a roll shape in the side of the LCD panel. The LCD further comprises receiving members(100,600) and a mold frame(400). The first panel board assembly comprises the following parts. A circuit component(223b) drives the LCD panel. A board(223a) mounts the circuit component.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY}

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

FIG. 2 is a sectional view taken on line A-A in FIG. 1; FIG.

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

<Explanation of symbols for the main parts of the drawings>

100: upper housing member 200: liquid crystal display panel

221: drive unit 222: cable

223: first panel board assembly 300: light guide plate

310: prism sheet 320: diffusion sheet

330: reflective sheet 400: mold frame

510: light emitting diode 520: substrate

530: second panel board assembly 600: lower housing member

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of reducing the thickness of the liquid crystal display device and blocking electromagnetic waves generated from the panel board assembly.

In general, the liquid crystal display (LCD) has been expanding its application range due to features such as light weight, thinness, low power driving, full color, and high resolution. Currently, liquid crystal displays are used in computers, notebooks, PDAs, telephones, TVs, and audio / video devices. Such a liquid crystal display displays a desired image on a liquid crystal display panel in which light transmittance is adjusted according to image signals applied to a plurality of control switches arranged in a matrix form.

Among the liquid crystal display devices, the liquid crystal display panel of a laptop PC equipped with a backlight unit using a light emitting diode as a light source includes a panel board assembly (PBA) for driving the liquid crystal display panel. In other words, it has a structure that is bent to the lower surface of the backlight unit. The liquid crystal display according to the related art has a problem in that the thickness of the liquid crystal display is increased by the thickness of the panel board assembly because the panel board assembly is located on the lower surface of the backlight unit. In laptop PCs requiring thinness due to portability, the increase in the thickness of the liquid crystal display device is fatal.

In addition, in relation to the wireless wide area network (WWAN) and the wireless local area network (WLAN), which have become an issue in recent years, the thickness of the panel board assembly due to positioning the panel board assembly on the lower surface of the backlight unit as described above. The increase may cause problems when surrounding the panel board assembly such as a cover (flexible printed circuit board using copper foil or silver ink, etc.) shielding electromagnetic waves.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a liquid crystal display having a reduced thickness.

Another object of the present invention is to provide a liquid crystal display device that shields electromagnetic waves of a panel board assembly without a separate member.

In order to achieve the above object, the present invention provides a liquid crystal display panel for displaying an image, a backlight unit for supplying light to the liquid crystal display panel, a liquid crystal display panel connected to the liquid crystal display panel to supply a signal, It is possible to provide a liquid crystal display comprising a first panel board assembly located.

In this case, the first panel board assembly may be bent in the direction of the backlight unit. However, the present invention is not limited thereto, and the first panel board assembly may be wound in a roll form on the side of the liquid crystal display panel. In this case, the first panel mode assembly may include a circuit component for driving the liquid crystal display panel and a substrate for mounting the circuit component, and the circuit component may be positioned between the substrate wound in a roll shape.

In addition, the backlight unit may include a light source and a second panel board assembly for driving the light source, and the second panel board assembly may be positioned at a side surface of the liquid crystal display panel. In this case, the second panel board assembly may be bent in the direction of the liquid crystal display panel. However, the present invention is not limited thereto, and the second panel board assembly may be wound in a roll form on the side of the liquid crystal display panel. In this case, the second panel mode assembly may include a circuit component for driving the light source and a substrate for mounting the circuit component, and the circuit component may be positioned between the substrate wound in a roll shape.

In addition, the substrate preferably comprises a flexible printed circuit board.

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

However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention, and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you. Like reference numerals in the drawings refer to like elements.

1 is a schematic exploded perspective view of a liquid crystal display according to a first exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line A-A of FIG.

As shown in FIGS. 1 and 2, the liquid crystal display according to the first exemplary embodiment of the present invention includes a liquid crystal display panel 200 and a first panel board assembly for applying a signal to the liquid crystal display panel 200. 223, the backlight unit 1000 for supplying light to the liquid crystal display panel 200, the liquid crystal display panel 200, the first panel board assembly 223, and the backlight unit 1000. It includes a receiving member (100, 600) for. The apparatus may further include a mold frame 400 for fixing the liquid crystal display panel 200 and the backlight unit 1000 in position.

The liquid crystal display panel 200 is for displaying an image, and includes a thin film transistor substrate 200b and a color filter substrate 200a bonded to the thin film transistor substrate 200b.

The thin film transistor substrate 200b may be a light-transmitting insulating substrate including a plurality of pixel regions in a matrix form and including a thin film transistor and a pixel electrode provided in the pixel region. At this time, it is effective to use a rectangular glass substrate as shown in the figure as the insulating substrate for forming the thin film transistor and the pixel electrode. In this case, the thin film transistor substrate 200b overlaps the color filter substrate 200a and is exposed to the outside when the image area is displayed and when the thin film transistor substrate 200a is bonded to the color filter substrate 200a and the driving unit of the liquid crystal display panel 200 is mounted. Divided into non-display areas.

The source terminal of the thin film transistors is connected to a data line extending in one direction, and the gate terminal is connected to a gate line extending in another direction perpendicular to the one direction. The drain terminal is connected to a pixel electrode made of a transparent conductive material provided in a part of the pixel region. In this case, it is preferable to use indium tin oxide (ITO) or indium zinc oxide (IZO) as the transparent conductive material.

In the thin film transistor substrate 200b, when an electrical signal is applied to the gate line and the data line, the thin film transistor is turned on or turned off, and thus the thin film transistor substrate 200b is applied to the electrical signal of the data line, that is, the pixel formation. The necessary electrical signal is applied to the pixel electrode. The liquid crystal display according to the present invention may further include a separate driver 221 for driving the gate line and the data line. In this case, the liquid crystal display panel 200 according to the present invention is connected to the gate line and the data line, as shown in the drawing, the liquid crystal display panel 200 driver 221 for applying a predetermined signal to the gate line and the data line. Has a structure mounted on one end of the thin film transistor substrate 200b, that is, in the non-display area, in the form of an IC.

The color filter substrate 200a may be a light-transmitting insulating substrate including a pixel region corresponding to the thin film transistor substrate 200b and a color filter and a common electrode provided in the pixel region.

The color filter and the common electrode may be disposed in a plurality of pixel areas corresponding to the pixel electrode, and the common electrode may be disposed on the entire surface of the color filter substrate 200a. In addition, the color filter substrate 200a may be provided with a black matrix pattern for preventing light leakage. Here, the common voltage Vcom is applied to the common electrode.

Meanwhile, the above-described thin film transistor substrate 200b and the color filter substrate 200a are pressed by pressing the two substrates such that each pixel electrode and the common electrode face each other. In this case, a predetermined sealing film may be applied to seal the two substrates. In addition, a spacer may be provided to maintain a cell gap between the two substrates. Thereafter, the liquid crystal is injected and sealed between the two bonded substrates through liquid crystal injection to manufacture the liquid crystal display panel 200. Although liquid crystal injection was performed in the above, a liquid crystal may be dripped before bonding of two board | substrates.

The liquid crystal display panel 200 manufactured as described above turns on the thin film transistor of the thin film transistor substrate 200b to apply an electrical signal necessary for pixel formation to the pixel electrode, and a common voltage to the common electrode of the color filter substrate 200a. When is applied, an electric field is formed between the pixel electrode and the common electrode. Such an electric field causes the arrangement of the liquid crystal layer to change, and the light transmittance is changed according to the changed arrangement to display a target image.

The LCD panel 200 may further include a first panel board assembly 223 electrically connected to the liquid crystal display panel 200 and the driver of the liquid crystal display panel 200 and in which various circuit components 223b are mounted on the substrate 223a. have. The first panel board assembly 223 generates an electrical signal for controlling the gate driver and the data driver, a timing controller for controlling a digital data signal input from the outside, and a DC-DC for generating different kinds of voltages. A power supply driver such as a gamma standard voltage generator for voltage outputting the gray scale of the converter circuit and the data driver may be mounted.

In this case, the first panel board assembly 223 is bent to the side of the liquid crystal display to reduce the thickness of the liquid crystal display. That is, the thickness of the liquid crystal display may be reduced by bending the first panel board assembly 223 toward the backlight unit 1000 so that the first panel board assembly 223 is positioned on the side surfaces of the liquid crystal display panel 200 and the backlight unit 1000. To this end, a cable 222 for connecting the liquid crystal display panel 200 and the first panel board assembly 223 may be provided, and the cable 222 may be, for example, flexible printed with good bending. Flexible printed circuits (FPCs) may be used. However, the present invention is not limited thereto, and a flexible printed circuit board may be used as the substrate 223a of the first panel board assembly 223.

As such, when the first panel board assembly 223 is disposed on the side surfaces of the liquid crystal display panel 200 and the backlight unit 1000, the thickness of the first panel board assembly 223, that is, the first panel board assembly 223 is configured. The thickness of the liquid crystal display device may be reduced by the thickness of the substrate 223a and the circuit component 223b.

In addition, in the present exemplary embodiment, when another board connected to the first panel board assembly 223 is connected with a cable (not shown), the first panel board assembly 223 is located at the side of the backlight unit 1000 so that the cable The connection portion (not shown) is positioned at the side of the backlight unit 1000. As described above, when the cable connection part (not shown) is located at the side of the backlight unit 1000, defects due to friction with the cable (not shown) may be minimized against vibration or shock.

On the other hand, the backlight unit 1000 is to supply the light required for the liquid crystal display panel 200 to display an image, in the present embodiment, the light emitting diode 510, the light guide plate 300, the optical sheet 310, 320, 330).

The backlight unit 1000 is provided on the light emitting diode 510 for generating light and on the upper or lower surface of the light emitting diode 510 to improve the quality of light emitted from the light emitting diode 510 and to increase efficiency. The optical sheet 310, 320, 330, and the lower accommodating member 600 for accommodating the light emitting diode 510 and the optical sheet 310, 320, 330. In this case, it may include a second panel board assembly 530 for driving the light emitting diode 510.

The second panel board assembly 530 may include a circuit component for driving the light emitting diode 510 and a substrate for mounting the light emitting diode 510. In this case, the second panel board assembly 530 may also be positioned on the side of the liquid crystal display device in the same manner as the first panel board assembly 223. That is, the thickness of the liquid crystal display may be reduced by placing the substrate 520 on which the light emitting diode 510 is mounted so that the second panel board assembly 530 is positioned on the side of the liquid crystal display panel 200. In this case, the second panel board assembly 530 may be bent in the direction of the liquid crystal display panel 200 to secure a bending space. That is, it is preferable to bend the substrate 520 on which the light emitting diode 510 is mounted in the direction of the liquid crystal display panel 200. In this case, the first and second panel board assemblies 223 and 530 are preferably disposed in parallel with the side surfaces of the liquid crystal display panel 200 in terms of space saving.

The light emitting diode 510 may include a white (W) light emitting diode 510 as a main light source of the backlight unit 1000. The light emitting diode 510 includes a light emitting chip that is a compound semiconductor having a pn junction structure therein, and the light emitting diode 510 emits a specific color to emit white (W) and the white light (W). It may include a phosphor for exciting with light. However, the present invention is not limited thereto, and white (W) may be implemented by a combination of a light emitting chip or a light emitting diode 510 emitting red (R), green (G), and blue (B).

The light guide plate 300 is for controlling the point light source emitted from the light emitting diode 510 to a surface light source, and is made of a transparent material having a constant refractive index, such as polyolefin or polycarbonate, which is usually PMMA (Poly Methy Methacrylate), which is an acrylic resin. Are manufactured. The light guide plate 300 as described above may include at least one of a molded light guide plate, a light scattering light guide plate, and a hollow light guide plate.

The optical sheets 310, 320, and 330 are for improving the quality and efficiency of light emitted from the light emitting diode 510 through the light guide plate 300. In this embodiment, the diffusion sheet 320 and the prism sheet ( 310 and a reflective sheet 330.

The diffusion sheet 320 is positioned on the upper surface of the light guide plate 300 to uniformly diffuse the light emitted from the light guide plate 300 and transmit the light to the front direction of the prism sheet 310 and the liquid crystal display panel 200 to widen the viewing angle. In order to reduce diffusion of bright spots, bright lines, spots, and the like, the light guide plate 300 is preferably located between the prism sheet 310. The diffusion sheet 320 may be manufactured using polycarbonate (PC) resin or polyester (PET) resin.

The prism sheet 310 is for injecting the light emitted from the light guide plate 300 to the liquid crystal display panel 200 by increasing the luminance by refracting and condensing the light. For this purpose, the upper surface of the light guide plate 300, that is, the light guide plate 300. ) And the liquid crystal display panel 200. As the prism sheet 310, a strip-shaped micro-prism is formed on a base material such as polyester, and two horizontal and vertical sheets may be used as one set.

The reflective sheet 330 reflects the light exiting to the lower surface of the light guide plate 300 again and enters the liquid crystal display panel 200 (not shown) to prevent light staining. ) Is preferably located on the lower surface of the light guide plate 300. The reflective sheet 330 may be manufactured using, for example, white foamed PET, and it is preferable to increase the reflectance by forming a multilayer air layer. In this case, the reflective sheet 330 may be omitted by forming a material having excellent reflection efficiency on the bottom surface of the lower housing member 600. In addition, the reflective sheet 330 may be integrally formed with the lower accommodating member 600.

The accommodating member is for protecting and accommodating the backlight unit 1000, the liquid crystal display panel 200, and the first panel board assembly 223. The upper accommodating member 100 is positioned on the liquid crystal display panel 200. ) And a lower accommodating member 600 positioned under the backlight unit 1000.

The upper accommodating member 100 and the lower accommodating member 600 may each include a flat base plate and sidewalls extending vertically from the edge of the base plate. In addition, a predetermined storage space is formed when the upper housing member 100 and the lower housing member 600 are coupled to each other by the above structure, and the liquid crystal display panel 200 and the first panel board assembly ( 223 and the backlight unit 1000 may be stored and protected.

Next, a liquid crystal display according to a second exemplary embodiment of the present invention will be described with reference to the accompanying drawings. Descriptions overlapping with the above-described liquid crystal display according to the first embodiment of the present invention will be omitted or briefly described.

3 is a schematic cross-sectional view of a liquid crystal display according to a second exemplary embodiment of the present invention.

As shown in FIG. 3, the liquid crystal display according to the second exemplary embodiment of the present invention includes a liquid crystal display panel 200, a third panel board assembly 224 for applying a signal to the liquid crystal display panel 200. And a backlight unit 1000 that supplies light to the liquid crystal display panel 200 and includes a fourth panel board assembly (not shown), the liquid crystal display panel 200, the third panel board assembly 224, and a backlight. It includes a receiving member for receiving and protecting the unit (1000).

The third panel board assembly 224 according to the present embodiment uses a flexible printed circuit board that can be easily bent into a substrate 224a on which various circuit components 224b are mounted, and rolls the flexible printed circuit board. Roll) so that the circuit component 224b is positioned therein. In this case, the fourth panel board assembly (not shown) also uses a flexible printed circuit board that can be easily bent into a board on which circuit components are mounted, similarly to the third panel board assembly 224. It is desirable to roll in the form of a roll so that the circuit component is located therein.

That is, in the present embodiment, a circuit cover is placed in a flexible printed circuit board for shielding electromagnetic interference (EMI) for a wireless wide area network and a wireless local area network. It can block the electromagnetic wave generated from the part. In addition, the manufacturing cost of the liquid crystal display may be reduced by omitting the cover that shields electromagnetic waves as described above.

In addition, according to the present embodiment, the third and fourth panel board assemblies 224 (not shown) may be formed in a roll shape and positioned on the side of the liquid crystal display panel 200 in the same manner as the first embodiment of the present invention. It is possible to reduce the thickness of the liquid crystal display at the same time as the electromagnetic shielding.

Although described above with reference to the drawings and embodiments, those skilled in the art can be variously modified and changed within the scope of the invention without departing from the spirit of the invention described in the claims below. I can understand.

As described above, the present invention can provide a liquid crystal display device having a reduced thickness by placing the panel board assembly on the side of the liquid crystal display panel.

In addition, according to the present invention, the panel board assembly may be wound in a roll to shield electromagnetic waves generated from circuit components, and the manufacturing cost of the liquid crystal display may be reduced by omitting a cover for shielding the electromagnetic waves.

In addition, the present invention can provide a liquid crystal display device in which the cable connection portion of the panel board assembly is located on the side of the backlight unit to minimize a defect due to friction with the cable against vibration or shock.

Claims (9)

A liquid crystal display panel for displaying an image, A backlight unit for supplying light to the liquid crystal display panel; And a first panel board assembly connected to the liquid crystal display panel to supply a signal and positioned at a side of the liquid crystal display panel. The method according to claim 1, And the first panel board assembly is bent in a direction of a backlight unit. The method according to claim 1, And the first panel board assembly is wound in a roll form on the side of the liquid crystal display panel. The method according to claim 3, The first panel mode assembly may include a circuit component for driving the liquid crystal display panel; A substrate for mounting the circuit components, The circuit component is positioned between the substrate wound in the form of a roll. The method according to claim 1, The backlight unit includes a light source, A second panel board assembly for driving said light source, And the second panel board assembly is positioned at a side of the liquid crystal display panel. The method according to claim 5, And the second panel board assembly is bent in a direction of the liquid crystal display panel. The method according to claim 5, And the second panel board assembly is wound in a roll on the side of the liquid crystal display panel. The method according to claim 7, The second panel mode assembly comprises a circuit component for driving the light source; A substrate for mounting the circuit components, The circuit component is positioned between the substrate wound in the form of a roll. The method according to claim 4 or 8, And the substrate comprises a flexible printed circuit board.

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