KR20070109471A - Liquid crystal display module and assembly method thereof - Google Patents

Abstract

An LCD module and an assembly method thereof are provided to place the elastic pad between a backlight unit and a connector by using a wing portion of a shied cover provided with the elastic pad to remove a need for separate assembly of attaching an elastic pad, thereby preventing defective exterior due to the elastic pad. A liquid crystal panel displays an image. A backlight unit(40) supplies light to the liquid crystal panel. A printed circuit board(26) is connected with the liquid crystal panel by using a circuit film(24), and is mounted on one surface of the backlight unit. A connector(30) is mounted at the printed circuit board. A shield cover(50) protects the printed circuit board. An elastic pad(54) is attached to the shield cover, and is placed between the backlight unit and the connector. A wing portion(52) diverges from the shield cover and the elastic pad is attached to the wing portion.

Description

Liquid crystal display module and its assembly method {LIQUID CRYSTAL DISPLAY MODULE AND ASSEMBLY METHOD THEREOF}

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

FIG. 2 is a view for explaining a method of assembling the liquid crystal display module shown in FIG. 1.

3 is a rear view of a liquid crystal display module according to an exemplary embodiment of the present invention.

FIG. 4 is a cross-sectional view of the connector portion of the liquid crystal display module illustrated in FIG. 3 taken along line IV-IV ′.

<Description of Symbols for Main Parts of Drawings>

10 liquid crystal panel 12 top plate

14: lower plate 20: drive unit

22: driving chip 24: circuit film

26: printed circuit board 28: insertion hole

30 connector 40 backlight unit

42: mold frame 44: optical sheet

46: reflective sheet 48: light guide plate

50: shield cover 52: wing

54: elastic pad 56: incision

100: liquid crystal display module

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display module, and more particularly, to a liquid crystal display module and an assembly method thereof, which are easy to assemble while preventing a poor image quality due to the pressing of a connector.

The liquid crystal display module displays an image by using the electrical and optical characteristics of the liquid crystal. Specifically, the liquid crystal display module includes a liquid crystal display panel (hereinafter, referred to as a liquid crystal panel) for displaying an image through a pixel matrix for controlling the liquid crystal, a driving circuit for driving the liquid crystal panel, and a backlight unit for supplying light from the rear surface of the liquid crystal panel. It is provided. The liquid crystal panel displays an image by adjusting the transmittance of light emitted from the backlight unit by changing the liquid crystal arrangement state according to each sub-pixel of the pixel matrix according to the data signal.

The driving circuit for driving the liquid crystal panel is integrated in a chip form and mounted on a circuit film and connected between a printed circuit board (PCB) on which a control chip and a power chip are mounted and the liquid crystal panel. The printed circuit board is provided with a connector for connection with an external computer system. The printed circuit board is protected by the shield cover, and the connector is exposed through a groove in which one end of the shield cover is connected to the external connector.

After the assembly of the liquid crystal display module is completed, a reliability test is performed to apply a constant force to each of the front and rear surfaces. At this time, when the connector is pressed, it causes a failure of pressing on the optical sheet of the backlight unit, and the pressing failure portion of the optical sheet lowers the optical uniformity, resulting in poor image quality appearing in the form of a white spot on the liquid crystal panel.

In order to prevent this, an elastic pad is attached to the rear surface of the reflective sheet, which is the lowermost layer of the backlight unit, to absorb and relax the force applied through the connector. However, since the position of the connector is different for each model, it is troublesome to adjust the position of the elastic pad according to the position of the connector and attach it to the back of the reflective sheet. As a result, not only the productivity of the liquid crystal display module is degraded, but also the size of the elastic pad is increased in view of the margin of attachment of the elastic pad, resulting in poor appearance, resulting in a poor appearance of the liquid crystal display module.

Accordingly, the present invention provides a liquid crystal display module and a method for assembling the same, which are designed to solve the problems of the related art and can easily assemble an elastic pad and prevent defective appearance due to the elastic pad.

To this end, the liquid crystal display module according to an aspect of the present invention comprises a liquid crystal panel for displaying an image; A backlight unit for supplying light to the liquid crystal panel; A printed circuit board connected to the liquid crystal panel through a circuit film and seated on one surface of the backlight unit; A connector mounted to the printed circuit board; A shield cover protecting the printed circuit board; And an elastic pad attached to the shield cover and positioned between the backlight unit and the connector.

The shield cover further includes a wing portion branched from the shield cover and to which the elastic pad is attached, and the printed circuit board further includes an insertion hole into which the wing portion to which the elastic pad is attached is inserted. The elastic pad is attached to at least one of both sides of the wing portion. The wing is branched from the shield cover through an incision.

According to another aspect of the present invention, there is provided a method of assembling a liquid crystal display module, the method including allowing a liquid crystal panel connected with a printed circuit board to be seated on one side of a backlight unit, and the printed circuit board seated on the other side of the backlight unit; ; Attaching a shield cover protecting the printed circuit board to the backlight unit and exposing a connector mounted on the printed circuit board; And placing the elastic pad attached to the shield cover in alignment with the connector and the backlight unit.

Here, the elastic pad is positioned between the connector and the backlight unit in a state where it is attached to at least one surface of the wing portion branched from the shield cover. The wing portion to which the elastic pad is attached is inserted through an insertion hole formed in the printed circuit board to be positioned between the connector and the backlight unit.

Other features and advantages of the present invention in addition to the features of the present invention will become apparent from the description of the preferred embodiment of the present invention with reference to the accompanying drawings.

Hereinafter, with reference to Figures 1 to 4 attached to a preferred embodiment of the present invention will be described in detail.

FIG. 1 is an exploded perspective view of an LCD according to an exemplary embodiment of the present invention, and FIG. 2 is a perspective view of the LCD cover module in FIG. It is a rear view of the liquid crystal display module shown. 4 is a cross-sectional view of the connector portion of the liquid crystal display module illustrated in FIG. 3 taken along the line IV-IV '.

The liquid crystal display module 100 illustrated in FIGS. 1 to 4 includes a liquid crystal panel 10 for displaying an image, a backlight unit 40 for supplying light to the rear surface of the liquid crystal panel 10, and a liquid crystal panel 10. And a shield cover 50 covering the driving unit 20 connected thereto. In addition, the liquid crystal display module 100 is coupled to surround the liquid crystal panel 10 and the backlight unit 40 to prevent the liquid crystal panel 10 and the backlight unit 40 from flowing. A chassis (not shown) is further provided.

The liquid crystal panel 10 has a structure in which an upper plate 12 having a color filter array and a lower plate 14 having a thin film transistor array are bonded to each other with a liquid crystal interposed therebetween. On the contrary, the lower plate 14 of the liquid crystal panel 10 may have a structure in which both the thin film transistor array and the color filter array are formed. The liquid crystal panel 10 has a structure in which sub pixels independently driven by thin film transistors are arranged in a matrix form for image display. Each of the sub pixels expresses grayscale by controlling the light transmittance by controlling the liquid crystal array according to the difference voltage between the common voltage supplied to the common electrode and the data signal supplied to the pixel electrode through the thin film transistor. Accordingly, the color of each pixel is realized by a combination of red, green, and blue sub-pixels representing gray levels according to data signals, and an image is displayed on the liquid crystal panel 10 by the combination of each pixel. Since the liquid crystal panel 10 is a non-light emitting device, light generated from the backlight unit 60 is used.

The driver 20 is connected to the lower plate 14 to drive the liquid crystal panel 10. The driver 20 includes a data driver chip 22 for driving a data line formed on the lower plate 14 of the liquid crystal panel 10, a gate driver (not shown) embedded in the lower plate 14 to drive a gate line, A plurality of circuit films 24 mounted on the data driving chip 22 and connected to the lower plate 14 and one side thereof, and a printed circuit board 26 connected to the other sides of the plurality of circuit films 24. .

The printed circuit board 26 includes a control chip (not shown) for controlling the data driver chip 22 and the gate driver, a power chip (not shown) for supplying driving voltages required for the driver 20, and the like. The printed circuit board 26 is provided with a connector 30 for connection with an external computer system, and an insertion hole 28 is formed adjacent to the connector 30. The insertion hole 28 is branched from the shield cover 50 and has a size into which the wing portion 52 to which the elastic pad 54 is attached can be inserted, and is formed in parallel with the connector 30.

The circuit film 24 having the data driving chip 22 mounted thereon is a printed circuit board 26 in the form of a chip on film (COF) or tape carrier package (TCP), as shown in FIG. 1. ) And the lower plate 14. The gate driver is formed and embedded in the thin film transistor array manufacturing process of the lower plate 14. On the other hand, the gate driver may be integrated in the form of a chip like the data driver chip 22, mounted on the circuit film 24, and connected to the lower plate 21. Alternatively, the data driver chip 22 and the gate driver may be directly mounted on the lower plate 14 in a chip on glass (COG) manner.

The backlight unit 40 includes a plurality of optical sheets 44 seated on a plastic mold frame 42, a light source unit (not shown) and a light guide plate inserted in a space below the optical sheet 44 in the mold frame 42. 48; FIG. 4). The light source unit is disposed to face at least one side surface of the light guide plate 48. The light source unit includes a cylindrical lamp for emitting light and a lamp case surrounding an outer circumferential surface of the lamp, or a plurality of light emitting diodes for emitting light and a circuit board on which the light emitting diodes are mounted. The light guide plate 48 guides the light incident from the light source portion through the side toward the plurality of optical sheets 44 stacked on the light guide plate 48 as shown in FIG. 4. The plurality of optical sheets 44 may include a diffusion sheet for diffusing light from the light guide plate 48, a prism sheet for collecting the diffused light in a direction perpendicular to the liquid crystal panel 10, a protective sheet for protecting the prism sheet, and the like. Including improves the light efficiency. Also, a reflecting sheet 46 (FIGS. 2 to 4) is disposed below the light guide plate 48 to reflect light traveling under the light guide plate 48 toward the light guide plate 48 to be directed to the optical sheets 44. To improve.

On the other hand, unlike the edge type in which the light source unit is disposed on the side surface of the light guide plate as described above, the backlight unit 40 may have a direct structure in which a plurality of light sources are directly disposed under the optical sheet 44 so that the light guide plate is not required. For example, the direct type backlight unit may include a plurality of light sources, that is, a mold frame is stacked on a bottom chassis in which a plurality of lamps are arranged side by side or a plurality of circuit boards on which a plurality of light emitting diodes are mounted side by side, and a plurality of mold frames are stacked on the mold frame. The optical sheet has a structure on which it is seated.

As described above, the liquid crystal panel 10 and the backlight unit 40 have a top chassis (not shown) surrounding their periphery and are fastened to the mold frame 42 and / or the bottom chassis (not shown) to protect against external shocks and prevent flow. do

The shield cover 50 is formed of a material such as polyethylene terephthalate (PET) to protect the printed circuit board 26 positioned on the rear surface of the backlight unit 40. The shield cover 50 is provided with a groove 58 in which a part of one end is stepped in order to expose the connector 30 of the printed circuit board 26. In addition, the shield cover 50 is inserted through an insertion hole 28 provided in the printed circuit board 26 to be positioned between the backlight unit 40 and the connector 30 of the printed circuit board 26. ) Is further provided. The wing 52 has a structure branched from the shield cover 50 through the cutout 56 of the shield cover 50. The wing 52 is attached with an elastic pad 54 for dispersing and alleviating the force due to the pressing of the connector 30 to prevent the pressing failure of the optical sheet 44. The elastic pad 54 has a larger area than the connector 30 in consideration of the margin of alignment with the connector 30, but the exposed portion of the elastic pad 54 is a liquid crystal display. Do not have an area large enough to damage the outside of the module 100. The elastic pad 54 is formed on at least one surface of both surfaces of the wing portion 52. For example, the elastic pad 54 may be attached to one surface of the wing 52 facing the connector 30, or may be attached to one surface of the wing 52 facing the backlight unit 40, or may be attached to both surfaces of the wing 52. Attached. The elastic pad 54 is inserted through the insertion hole 28 of the printed circuit board 26 together with the wing 52 in the process of attaching the shield cover 50 to the rear surface of the backlight unit 40. It is located between the back of the unit 40 and the connector 30. Accordingly, the assembling process of placing the elastic pad 54 between the backlight unit 40 and the connector 30 is simple, thereby improving the assemblability of the liquid crystal display module 100.

Specifically, look at the assembly process of the liquid crystal display module according to the present invention.

The driver 20 is attached to the liquid crystal panel 10, and then the periphery of the liquid crystal panel 10 is seated on the mold frame 42 of the backlight unit 40. In the mold frame 42, a seating part on which the peripheral parts of the plurality of optical sheets 44 are seated and a seating part on which the peripheral parts of the liquid crystal panel 10 are seated are formed stepwise so that the liquid crystal panel 10 may be formed of the optical sheet 44. It is seated on the mold frame 42 in a spaced apart state. Subsequently, the circuit film 24 attached to the liquid crystal panel 10 is bent so that the printed circuit board 26 is seated on the rear surface of the backlight unit 40 as shown in FIG. 2. At this time, the printed circuit board 26 may be seated on a seating portion provided on the rear surface of the mold frame 42.

Subsequently, the liquid crystal panel 10 and the backlight unit 40 have a top chassis (not shown) surrounding their periphery and are fastened with the mold frame 42 and / or the bottom chassis (not shown) of the backlight unit 40. 10 and the backlight unit 40 are protected from external impact and prevent flow.

Next, as shown in FIGS. 2 and 3, the shield cover 50 is attached to the rear surface of the backlight unit 40 to protect the printed circuit board 26. At this time, the wing portion 52 branched through the cut portion 56 of the shield cover 50 and the elastic pad 54 is attached is inserted through the insertion hole 28 of the printed circuit board 26. Accordingly, as shown in FIG. 4, the wing portion 52 to which the elastic pad 54 is attached is positioned between the backlight unit 40 and the printed circuit board 26, and the elastic pad 54 is the backlight unit 40. And positioned between the connector 30. In other words, the elastic pad 54 attached to the wing 52 through a simple assembly process of inserting the wing 52 branched from the shield cover 50 into the insertion hole 28 of the printed circuit board 26. ) May be aligned with the rear surface of the connector 30 and overlap with the connector 30 as shown in FIG. 3.

Accordingly, the elastic pad 54 absorbs and relieves the force applied to the connector 30, such as a white spot caused by poor pressing of the optical sheet 44 due to the connector 30 and poor pressing of the optical sheet 44. Image quality can be prevented. In addition, since the elastic pad 54 has an appropriate size according to the position of the connector 30, the appearance of the liquid crystal display module 100 may be poor due to the large area of the elastic pad 54. Can also be prevented.

Meanwhile, in the liquid crystal display module 100 according to the present invention, the wing portion 52 having the elastic pad 54 attached thereto is branched from the shield cover 50 and the insertion hole 28 of the printed circuit board 26 is formed. Positions are variously changeable and are not limited to those shown in the drawings.

As described above, the liquid crystal display module and the assembly method thereof according to the present invention require a separate assembly to attach the elastic pad by placing the elastic pad between the backlight unit and the connector by using the wing of the shield cover with the elastic pad attached thereto. There will be no. Therefore, the liquid crystal display module and the assembly method thereof according to the present invention can simplify the assembly of the elastic pad, thereby improving productivity, and the appropriate size of the elastic pad, thereby preventing appearance defects due to the elastic pad.

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 (8)

A liquid crystal panel which displays an image; A backlight unit for supplying light to the liquid crystal panel; A printed circuit board connected to the liquid crystal panel through a circuit film and seated on one surface of the backlight unit; A connector mounted to the printed circuit board; A shield cover protecting the printed circuit board; And an elastic pad attached to the shield cover and positioned between the backlight unit and the connector. The method of claim 1, The shield cover And a wing portion branched from the shield cover and having the elastic pad attached thereto. The method of claim 2, The printed circuit board is And an insertion hole into which the wing portion to which the elastic pad is attached is inserted. The method of claim 2, And the elastic pad is attached to at least one of both surfaces of the wing portion. The method of claim 2, And the wing portion is branched from the shield cover through a cutout portion. Allowing a liquid crystal panel to which a printed circuit board is connected through a circuit film is seated on one side of the backlight unit and the printed circuit board is seated on the other side of the backlight unit; Attaching a shield cover protecting the printed circuit board to the backlight unit and exposing a connector mounted on the printed circuit board; And arranging an elastic pad attached to the shield cover to be aligned between the connector and the backlight unit. The method of claim 6, And the elastic pad is positioned between the connector and the backlight unit in a state in which the elastic pad is attached to at least one surface of the wing portion branched from the shield cover. The method of claim 7, wherein And the wing portion to which the elastic pad is attached is inserted through an insertion hole formed in the printed circuit board to be positioned between the connector and the backlight unit.

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