KR20080030776A - Liquid crystal display device - Google Patents

Abstract

An LCD(Liquid Crystal Display) is provided to protect a source PCB(Printed Circuit Board) by forming a cover shield and to fix the source PCB regardless of the floating of the cover shield by fixing the source PCB to a main supporter through a coupling part. An LCD comprises an LCD panel(102), a backlight unit, a main supporter(118), a source PCB(132), and a signal transfer part(130). The backlight unit applies light to the LCD panel. The main supporter supports the LCD panel and the backlight unit, and has a protrusion part(118d). The source PCB, on which circuits to generate signals necessary to drive the LCD panel are mounted, has a coupling part which is separably combined with the protrusion part. The signal transfer part electrically connects the source PCB with the LCD panel.

Description

Liquid Crystal Display Device

1 is a view showing the back of a conventional liquid crystal display device equipped with a cover shield.

2 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention as viewed from the back thereof.

3 is a cross-sectional view showing a main supporter of part A shown in FIG. 2;

4A and 4B show a main supporter and a source PCB of part A shown in FIG. 2, respectively.

5 is a view showing the attachment of the first tape shown in FIG.

6A and 6B are views illustrating the liquid crystal display rear surface before and after the cover shield is attached.

<Brief description of symbols for the main parts of the drawings>

16, 116: bottom cover 18, 118: main supporter

20, 24, 26, 120, 126, 134: tape 22, 122: cover shield

102: liquid crystal display panel 104: top case

128: driver integrated circuit 130: signal transmission unit

132: source printed circuit board

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of fixing and protecting a source printed circuit board.

In general, a liquid crystal display device ("LCD") is a typical flat panel display device that displays an image by adjusting the transmission amount of the light beam to correspond to the image signal. In particular, LCDs are in a trend of widening their application range due to features such as light weight, thinness, and low power consumption. According to this trend, LCDs are used as office automation devices and display devices of notebook computers. In addition, LCDs are being developed in the direction of large screen, high definition, and low power consumption in response to user demands.

A conventional liquid crystal display device includes a liquid crystal display panel and a backlight unit for irradiating light to the liquid crystal display panel.

The liquid crystal display panel is formed by bonding a thin film transistor substrate on which a thin film transistor array is formed and a color filter substrate on which a color filter array is formed, with the liquid crystal layer interposed therebetween. The data lines and the gate lines formed on the thin film transistor substrate of the liquid crystal display panel are perpendicular to each other. A thin film transistor ("TFT") connected to an intersection of the data lines and the gate lines supplies a data voltage supplied through the data line to the pixel electrode of the liquid crystal cell in response to a scan pulse of the gate line. . A black matrix, a color filter, a common electrode, and the like are formed on the color filter substrate. Accordingly, the liquid crystal cell rotates the liquid crystal having dielectric anisotropy by the potential difference between the data voltage supplied to the pixel electrode and the common voltage supplied to the common electrode to adjust the transmittance of light supplied from the backlight unit. A polarizing plate having an orthogonal optical axis is attached to the thin film transistor substrate and the color filter substrate of the liquid crystal display panel, and an alignment layer for determining the pretilt angle of the liquid crystal is further formed on the inner side of the liquid crystal layer. In addition, a storage capacitor is further formed in each of the liquid crystal cells. The storage capacitor is formed between the pixel electrode and the front gate line or between the pixel electrode and a common line (not shown) to maintain a constant data voltage charged in the liquid crystal cell.

The backlight unit is used as a light source of the liquid crystal display device, not the self-luminous display device. Such a backlight unit includes a direct type and an edge type according to the position of the light source. The edge type backlight unit installs a light source at one edge of the liquid crystal display, and irradiates the liquid crystal display panel with light incident from the light source through the light guide plate and the plurality of optical sheets. The direct type backlight unit arranges a plurality of light sources directly under the liquid crystal display panel, and irradiates the liquid crystal display panel with light incident from the light sources through the diffusion plate and the plurality of optical sheets.

The liquid crystal display further includes a driver integrated circuit for applying a driving signal to the thin film transistor of the liquid crystal display panel. The driver integrated circuit is mounted on a Tape Carrier Package (“TCP”), which is located between the source printed circuit board (“PCB”) and the liquid crystal display panel. By connecting the display panel, the driving signal can be supplied from the source PCB to the liquid crystal display panel through the driver integrated circuit.

The source PCB is positioned on the rear side of the liquid crystal display panel, so that the conventional liquid crystal display device further includes a cover shield covering the source PCB to protect the circuits of the exposed source PCB.

FIG. 1 is a view illustrating a rear surface of a conventional liquid crystal display equipped with a cover shield, and shows a bottom cover 16, a main supporter 18, and a cover shield 22.

The bottom cover 16 is disposed on the rear surface of the liquid crystal display panel (not shown) to form a liquid crystal display module such as a liquid crystal display panel and a backlight unit. In addition, the main supporter 18 is bent by the letter “c” to support the liquid crystal display panel, accommodate the backlight unit, and support the edge of the bottom cover 16.

A top case (not shown) is positioned in the front direction of the liquid crystal display panel. The top case is bent at right angles to surround the front edge of the liquid crystal display panel and the side surface of the main supporter 18 to form a rectangular band of metal material having a flat portion and a side portion. In order to fix the top case and the main supporter 18, at least one tape 20 is attached to cover a portion where the side surface of the top case and the rear surface of the main supporter 18 meet at right angles. In this case, when the tape 20 is attached to cover a part of the cover shield 22, the tape 20 may serve to fix the cover shield 22 to the rear surface of the liquid crystal display.

As described above, a source PCB (not shown) connected to the liquid crystal display panel through TCP is positioned on one side of the rear surface of the liquid crystal display on which the bottom cover 16 is formed, and a cover shield 22 protecting the source PCB is attached. . One side of the cover shield 22 is formed to cover a portion of the side of the top case, and is attached to the top case through a tape (not shown). In addition, the cover shield 22 and the source PCB are attached to each other via a double-sided tape 24 positioned between the cover shield 22 and the source PCB.

An aluminum tape 26 is attached to one side of the source PCB. The aluminum tape 26 is attached to the source PCB, the main supporter 18 and the top case to serve as a ground of the source PCB and to fix the source PCB.

As described above, in the conventional liquid crystal display device, the means for fixing the source PCB is not only provided with the aluminum tape 26, but also attached to the cover shield 22 through the double-sided tape 24. When a flow occurs in the cover shield 22, such as when carrying out an impact test, transporting the manufactured liquid crystal display device, and applying the liquid crystal display device to a notebook, the double-sided tape 24 attached to the cover shield 22 is generated. This also causes movement in the source PCB. As a result, interference between the source PCB and the connection portion of the TCP, causing damage to the driver integrated circuit attached to the TCP as well as TCP.

Accordingly, an object of the present invention is to provide a liquid crystal display device capable of fixing and protecting a source printed circuit board.

In order to achieve the above object, the liquid crystal display device according to the present invention comprises a liquid crystal display panel; A backlight unit radiating light onto the liquid crystal display panel; A main supporter supporting the liquid crystal display panel and the backlight unit and having a protrusion protruding from one side; A printed circuit board on which circuits for generating signals required for driving the liquid crystal display panel are mounted and having fastening portions detachably coupled to protrusions of the main supporter; And a signal transmission unit for electrically connecting the printed circuit board and the liquid crystal display panel.

The main supporter may include a first flat portion having a rectangular frame shape that supports an edge of a bottom surface of the liquid crystal display panel; A side portion forming a right angle structure with the first flat portion; And a second plane portion forming a right angle structure with the side portion.

The protruding portion extends from the second flat portion and has a protrusion protruding toward the printed circuit board.

The fastening part has a hole into which the protrusion is inserted.

The fastening portion is thinner than other portions of the printed circuit board.

The liquid crystal display may further include: a bottom cover mounted on a second planar portion of the main supporter and supporting the backlight unit under the backlight unit; A top case having a flat portion and a side portion to surround side surfaces of the liquid crystal display panel and the main supporter; And a cover shield for covering a portion of the top case side part and the printed circuit board.

The liquid crystal display further includes a first tape attached to cover a part of each of the printed circuit board, the second planar part of the main supporter, and a side part of the top case.

A portion of the first tape in contact with the cover shield is formed of a double-sided tape.

The top case is formed of a metal material and the first tape is an aluminum tape.

One side of the cover shield is attached to the side of the top case through a second tape.

The liquid crystal display further includes at least one third tape attached to cover the top case and a part of the main supporter.

At least one of the third tapes is attached to cover a portion of the cover shield.

The signal transmission unit is formed of a tape carrier package.

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

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 2 to 6B.

2 is an exploded view of a liquid crystal display according to an exemplary embodiment of the present invention as viewed from the back thereof.

2, a liquid crystal display according to an exemplary embodiment of the present invention includes a liquid crystal display panel 102, a bottom cover 116, a main supporter 118, and a liquid crystal display panel 102. A top case 104 and the like.

The liquid crystal display panel 102 is formed by bonding a thin film transistor substrate 102a on which a thin film transistor array is formed and a color filter substrate 102b on which a color filter array is formed, with a liquid crystal layer interposed therebetween. The data lines and the gate lines formed on the thin film transistor substrate 102a of the liquid crystal display panel 102 are perpendicular to each other. A thin film transistor ("TFT") connected to an intersection of the data lines and the gate lines supplies a data voltage supplied through the data line to the pixel electrode of the liquid crystal cell in response to a scan pulse of the gate line. . A black matrix, a color filter, a common electrode, and the like are formed on the color filter substrate 102b. Accordingly, the liquid crystal cell rotates the liquid crystal having dielectric anisotropy by the potential difference between the data voltage supplied to the pixel electrode and the common voltage supplied to the common electrode to adjust the transmittance of light supplied from the backlight unit. On the outer surface of the thin film transistor substrate 102a and the color filter substrate 102b of the liquid crystal display panel 102, a polarizing plate having an orthogonal optical axis is attached, and an alignment layer for determining the pretilt angle of the liquid crystal on the inner surface in contact with the liquid crystal layer. This is further formed. In addition, a storage capacitor is further formed in each of the liquid crystal cells. The storage capacitor is formed between the pixel electrode and the front gate line or between the pixel electrode and a common line (not shown) to maintain a constant data voltage charged in the liquid crystal cell.

The backlight unit, not shown, is positioned between the liquid crystal display panel 102 and the bottom cover 116 and used as a light source of the liquid crystal display device, not the self-luminous display device. Such a backlight unit includes a direct type and an edge type according to the position of the light source. The edge type backlight unit installs a light source at one edge of the liquid crystal display, and irradiates the liquid crystal display panel 102 with light incident from the light source through the light guide plate and the plurality of optical sheets. The direct type backlight unit arranges a plurality of light sources directly under the liquid crystal display panel 102, and irradiates the liquid crystal display panel 102 with light incident from the light sources through the diffusion plate and the plurality of optical sheets.

The main supporter 118 is a mold made of a plastic material. Referring to FIG. 3, a portion A of FIG. 2 and FIG. 2 is cut off, and the main supporter 118 is formed of a rectangular frame type supporting the bottom edge of the liquid crystal display panel 102. A first planar portion 118a, a side portion 118b perpendicular to the first planar portion 118a, and a second planar portion 118c perpendicular to the side surface 118b are formed. In addition, the main supporter 118 includes a protrusion 118d extending and protruding from the second planar portion 118c as shown in FIGS. 2 to 4A, and a protrusion 118e is formed on the protrusion 118d. .

The bottom cover 116 is seated on the second flat portion 118c of the main supporter 118 and is formed under the liquid crystal display panel 102 and the backlight unit to support the liquid crystal display panel 102 and the backlight unit.

On the thin film transistor substrate 102a of the liquid crystal display panel 102, a signal transmission unit 130 mounted with a driver integrated circuit 128 for applying a driving signal to a TFT is attached to the source printed circuit board. PCB ") 132 and the liquid crystal display panel 102 are connected. In this case, a tape carrier package (“TCP”) may be used as the signal transmitter 130.

The source PCB 132 includes circuits for generating a signal for driving the liquid crystal display panel 102 and is located close to the bottom of the bottom cover 116. The source PCB 132 has a fastening portion detachably coupled to the protrusion 118d of the main supporter 118. 2 and 4B, the fastening part illustrated in FIGS. 2 and 4B is formed of a hole 132a to fix the source PCB 132 to the main supporter 118 by inserting the protrusion 118e of the main supporter 118. In addition, the portion near the hole 132a of the source PCB 132, that is, the portion corresponding to the protrusion 118d of the main supporter 118 is formed thinner than other portions.

The top case 104 is bent at a right angle to surround the front edge of the liquid crystal display panel 102, the side surface of the liquid crystal display panel 102, and the side surface of the main supporter 118, and has a flat band and a metal side band having a side surface. It is formed in the form. The first tape 126 as shown in FIGS. 2 and 5 is attached to the side portion of the top case 104, the source PCB 132, and the second planar portion 118c of the main supporter 118. The first tape 126 is an aluminum tape, which serves as a ground of the source PCB 132 and at the same time, fixes the source PCB 132.

The liquid crystal display according to the exemplary embodiment of the present invention further includes a cover shield 122 to protect the source PCB 132 exposed due to being located close to the bottom of the bottom cover 116.

The cover shield 122 is formed to cover a portion of the side surface of the top case 104 and the source PCB 132, and one side of the cover shield 122 is formed on the side surface of the top case 104 by the second tape 134. Attached. In this case, when the portion 126a in which the cover shield 122 overlaps with the first tape 126 is formed of a double-sided tape, the cover shield 122 may be fixed to the source PCB 132. In addition, in order to fix the above-described top case 104 and the main supporter 118, the third side portion of the top case 104 and the second planar portion 118c of the main supporter 118 may cover a portion where they meet at right angles. When the tape 120 is attached, and the third tape 120 is attached to cover a part of the cover shield 122, the tape 120 is fixed to the rear surface of the liquid crystal display.

6A and 6B are views illustrating the liquid crystal display rear surface before and after the cover shield 122 is attached, respectively.

6A and 6B, the source PCB 132 disposed on the rear surface of the liquid crystal display device includes a protrusion 118e formed in the protrusion 118d of the main supporter 118 and a hole 132a formed in the source PCB 132. The first tape 126 is fixed primarily, and the second tape is fixed secondly due to the first tape 126. In addition, the cover shield 122 is primarily fixed by the double-sided tape portion 126a of the first tape 126, and is fixed by the third tape 120 attached to cover a part of the cover shield 122. It is fixed by car. In addition, the cover shield 122 is attached to the top case 104 through the second tape 134 shown in FIG.

As described above, the liquid crystal display according to the present invention forms a cover shield to protect the source PCB, and also includes a fastening portion for fastening the main supporter and the source PCB to fix the source PCB to the main supporter, thereby providing a flow of the cover shield. Regardless, the source PCB can be fixed.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present 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 (13)

A liquid crystal display panel; A backlight unit radiating light onto the liquid crystal display panel; A main supporter supporting the liquid crystal display panel and the backlight unit and having a protrusion protruding from one side; A printed circuit board on which circuits for generating signals required for driving the liquid crystal display panel are mounted and having fastening portions detachably coupled to protrusions of the main supporter; And And a signal transmission unit for electrically connecting the printed circuit board and the liquid crystal display panel. According to claim 1, The main supporter, A first flat portion having a rectangular frame shape supporting an edge of a bottom surface of the liquid crystal display panel; A side portion forming a right angle structure with the first flat portion; And And a second planar portion forming a right angle structure with the side portion. The method of claim 2, The protrusion, Is formed to extend in the second plane portion, And a projection protruding toward the printed circuit board. The method of claim 3, wherein The fastening portion, And a hole into which the protrusion is inserted. According to claim 1, And the fastening portion is thinner than other portions of the printed circuit board. The method of claim 2, A bottom cover mounted on the second planar portion of the main supporter and supporting the backlight unit under the backlight unit; A top case having a flat portion and a side portion to surround side surfaces of the liquid crystal display panel and the main supporter; And And a cover shield for covering a portion of the top case side part and the printed circuit board. The method of claim 6, And a first tape attached to cover each of the printed circuit board, the second planar part of the main supporter, and a part of the side part of the top case. The method of claim 7, wherein The first tape is a liquid crystal display, characterized in that the portion in contact with the cover shield is formed of a double-sided tape. The method of claim 8, The top case is formed of a metal material, And the first tape is an aluminum tape. The method of claim 6, One side of the cover shield is attached to the side surface of the top case via a second tape. The method of claim 6, And at least one third tape attached to cover the top case and a part of the main supporter. The method of claim 11, wherein And at least one of the third tapes is attached to cover a portion of the cover shield. According to claim 1, And the signal transmission unit is formed of a tape carrier package.

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