KR100687534B1 - Lcd module - Google Patents

Abstract

The present invention relates to an LCD module, by using a fixing boss formed in the mold frame and a fixing hole formed in the optical sheet to primarily fix the optical sheets to the mold frame to prevent the optical sheets from flowing horizontally, The optical sheets are completely fixed to the mold frame by joining the sub mold frame having the fixing hole inserted into the dragon boss to the mold frame.

As such, fixing the optical sheets using the mold frame and the sub mold frame may simplify assembly of the LCD module. In addition, the application of the present invention eliminates the seat fixing holder, thereby reducing the number of parts of the LCD module, thereby reducing the raw material cost of the LCD module.

Mold frame, fixing boss, sub mold frame, fixing hole, optical sheet

Description

LCD Module {LCD MODULE}

1 is an exploded perspective view schematically showing the structure of a conventional LCD module.

FIG. 2 is a cross-sectional view of FIG. 1 taken in II-II.

Figure 3 is an exploded perspective view schematically showing the structure of the LCD module according to the present invention.

Figure 4 is a partially cut perspective view showing a state in which the sub-mold frame is coupled to the mold frame according to the present invention to secure the optical sheets.

5 is a cross-sectional view taken along the line VV of FIG. 4.

The present invention relates to a backlight assembly of an LCD (Liquid Crystal Display (LCD)) module, and more particularly, to a sub mold frame and a mold frame without using separate fixing parts for sheets. The present invention relates to an LCD module capable of improving workability by fixing using the same.

Cathode ray tube (CRT), which is one of the commonly used display devices, is mainly used for monitors such as televisions, measuring devices, information terminal devices, etc., but due to its own weight and size, It could not actively respond to the demand for miniaturization and weight reduction.

In order to replace the cathode ray tube, it has advantages such as small size, light weight, low power consumption, and the like, and a liquid crystal display device that displays information by using the electrical and optical properties of the liquid crystal injected into the LCD panel has been actively developed. The function is improved enough to perform a role as a flat panel display device, and is used as a large-scale liquid crystal display device as well as a laptop computer and a monitor.

Unlike the cathode ray tube, such a liquid crystal display device is a liquid crystal material injected between the TFT substrate and the color filter substrate, not a material capable of generating light by itself, but a light-sensitive material that displays the light by controlling the amount of light coming from the outside. A separate light source, that is, a backlight assembly, for irradiating light to the LCD panel is essential.

As shown in FIG. 1, the mold sheet 10 having the storage space formed thereon as shown in FIG. 1 and the reflective sheet 20 which is sequentially stacked from the base surface of the storage space 12 of the mold frame 10 to increase light utilization efficiency , The light guide plate 22, the optical sheets 30, and the lamp unit 24 installed on the side of the light guide plate 22 to emit light for displaying information, and fastened to the lower surface of the mold frame 10. The bottom chassis 5 supporting the members installed in the storage space 12 and the top chassis 60 covering from the predetermined portion of the edge of the LCD panel 50 installed on the mold frame 10 to the side surface of the mold frame 10. It is composed of

Since the performance of the backlight assembly configured as described above greatly affects the display quality of the liquid crystal display device, it is important to improve the reliability of the backlight assembly by minimizing the flow by assembling tolerances between the members and considering the coefficient of thermal expansion. .

Here, when the assembly tolerance between the mold frame 10 and the light guide plate 22 is smaller than the thermal expansion coefficient of the light guide plate 22, the light guide plate 22 is bent in a predetermined direction by the mold frame 10, and the optical sheets ( In the case of 30), ooze is generated to deteriorate the display quality of the LCD module 1.

In addition, when the optical sheets 30 flow because the optical sheets 30 are not properly fixed to the mold frame 10, scratches are generated due to friction between the optical sheets 30, and are eccentric to one side. Cause the phenomenon.

Accordingly, in order to minimize the flow of the optical sheets 30, the sheet fixing holder 40 may be fixed after fixing the predetermined region of the edges of the optical sheets 30 to the mold frame 10 as shown in FIG. 1. Since the fixing part is covered using the optical sheets 30, the optical sheets 30 are completely fixed to the mold frame 10.

In more detail, as shown in FIG. 1, the rectangular fixing grooves 17 are formed at both ends of the short sides of the storage space 12 to the outside of the storage space 12, and the interior of each of the fixing grooves 17 is defined in FIG. Fixing bosses 18 are formed to prevent the optical sheets 30 from flowing in the horizontal direction.

The short sides of the optical sheets 30 fixed to the mold frame 10 configured as described above are fitted into the fixing protrusions 32 and the fixing bosses 18 fitted into the fixing grooves 17, so that the flow of the optical sheets 30 is fixed. Fixing holes 34 are formed to restrict the fixing protrusions 32, and the fixing protrusions 32 are formed at both ends corresponding to the fixing grooves 17 among short sides of the optical sheets 30, respectively. Are each formed in the portion corresponding to the fixing boss 18 of the fixing projection (32).

Meanwhile, in order to prevent the optical sheets 30 fixed to the mold frame 10 from flowing in the vertical direction due to vibration or shock, the optical sheets 30 are formed in the mold frame 10 as shown in FIG. 2. When all are fixed to the rectangular seat fixing holder 40 is slightly smaller than the size of the fixing groove 17 and the fixing hole 44 is formed in a portion corresponding to the fixing boss 18 into the fixing groove 17. The upper surface of the fixing groove 17 is closed.

In this case, in order to prevent the sheet fixing holder 40 from being separated from the fixing groove 17, as shown in FIG. 2, the sheet fixing holder 40 facing the fixing groove 17 by using the adhesive 45. The lower surface is bonded to the fixing groove 17.

However, at least four seat holders must be installed in the mold frame, and four or more seat holders must be fixed in a fixed groove of a narrow space by using an adhesive, which increases the working time and complicates the assembly process of the LCD module. .

In addition, since the sheet fixing holder is adhered to the mold frame using the flowable adhesive, the adhesive flows toward the optical sheet, causing a problem of contaminating the optical sheet.

Therefore, an object of the present invention is to reduce the manufacturing cost of the LCD module by removing some of the backlight components.

Another object of the present invention is to simplify the assembly process of the optical sheets to improve the workability and reliability of the LCD module.                         

Still other objects of the present invention will become more apparent from the following detailed description and the accompanying drawings.

In order to achieve the above object, the present invention provides a mold frame in which a storage space is formed in a predetermined portion of the upper surface, a fixing groove is formed in a predetermined rib portion formed at an edge of the storage space, and a fixing boss is formed inside the fixing groove. A reflection sheet installed on the base surface of the space to reflect light, a light guide plate installed on the upper surface of the reflection sheet to guide the light, a lamp unit installed on the side of the light guide plate to emit light, and an upper surface of the light guide plate; It improves the utilization efficiency of light and protrudes from the side corresponding to the fixing groove to the outside of the storage space by a predetermined length and is formed on the fixing boss and the fixing boss fitted in the fixing groove and corresponding to the fixing boss in the fixing protrusion. The optical sheet is provided with a first fixing hole, and is coupled to a mold frame to fix the optical sheets and the first fixing hole. And a sub-mold frame having a second fixing hole inserted into the fixing boss at a portion corresponding to the sub-mold, an LCD panel installed on the upper surface of the sub-mold frame to display information and an edge of the upper surface of the LCD panel. It includes a supporting top chassis.

Hereinafter, the structure of the LCD module according to the present invention will be described with reference to FIGS. 3 to 5.

As shown in FIG. 3, the LCD module 100 according to the present invention has a rectangular storage space 112 formed therein, and includes a mold frame 110 and a storage space 112 for receiving components for emitting and guiding light. Reflector sheet 120 is installed on the base surface of the reflecting light in the upper direction, the light guide plate 122 is installed on the upper surface of the reflecting sheet 120 to guide the light by emitting light incident from the side to the upper direction, the light guide plate An optical sheet coupled to the side of the 122 and installed on the upper surface of the light guide plate 122 and the lamp unit 124 that emits light, and diffuses and condenses the light transmitted from the light guide plate 122 to increase light utilization efficiency. And the mold frame 110, the sub-mold frame 140 and the sub-mold frame which restrict the flow of the optical sheets 130 because the optical sheets 130 are fixed together with the mold frame 110. LCD panel installed on the upper surface of the 140 to display information 150, and is coupled to a sub-mold frame 140 consists of a top chassis 160 for fixing the LCD panel 150.

Among the above-described members, only the mold frame 110, the optical sheets 130, and the sub-molded frame 140 which are directly related to the present invention will be described below.

First, the lower surface of the mold frame 110 is closed to support the reflective sheet 120, the light guide plate 122, the lamp unit 124, and the optical sheets 130, and the upper surface of the mold frame 110 stores the above-described members. The opening 112 is opened so that the above-described lamination can be performed.

In addition, a sub mold frame receiving groove 116 is formed at a short side of the mold frame 110 among the ribs 114 formed along the edge of the storage space 112, and the sub mold frame receiving groove 116 is formed of a mold frame ( It is formed from the both sides of the short side of the 110 to the point that enters the inside in the width direction of the mold frame 110 by a predetermined length. The sub-mold frame receiving groove 116 formed as described above is equal to the height of the mold frame 110 and the height of the sub-mold frame 140 when the sub-mold frame 140 is coupled to the mold frame 110. The module 100 is thinned.

Fixing grooves 117 are formed in each of the sub-mold frame receiving grooves 116 to fix the optical sheets 130 to the mold frame 110. Each of the fixing grooves 117 is shown in FIG. 3. As described above, it is formed from a sidewall of the storage space 112 to a predetermined portion of the rib 114 formed on the outside of the storage space. Each of the fixing grooves 117 formed as described above is provided with fixing bosses 118 protruding to a predetermined height to prevent the optical sheets 130 from flowing horizontally in the storage space 112.

Meanwhile, a slide groove 119 is formed at one end in the longitudinal direction of the mold frame 110 to insert the lamp unit 124 into the storage space 112 in a slide manner.

Fixing protrusions 132 fitted into the fixing groove 117 are formed in the optical sheets 130 installed in the mold frame 110 configured as described above, and the fixing protrusions 132 are formed of the optical sheets 130. It is formed in a portion corresponding to the fixing groove 117 of the short side, the fixing hole 144 is fitted in the center portion of the fixing protrusion 132, that is, the portion corresponding to the fixing boss 118 is fixed to the fixing boss 118 ( 134 are formed respectively.

As shown in FIG. 3, the sub mold frame 140 is divided into two, and the planar shape of each sub mold frame 140 is formed in a “c” shape. Therefore, as shown in FIG. 4, the short side of the sub mold frame 140 is accommodated in each sub mold frame receiving groove 116, and the long side of the sub mold frame 140 is a rib formed at the long side of the mold frame 110. Wrap 114. That is, the long sides of the sub-mold frames 140 and 150 correspond to the ribs 114 so as to cover the outer surface of the mold frame 110 from the inner wall of the storage space 112 to the upper surface of the ribs 114. The rib receiving groove 142 is formed.

In addition, a fixing hole 144 inserted into the fixing boss 118 is formed at a portion corresponding to the fixing boss 118 among the short sides of the sub-molded frame 140, so that the optical sheets 130 may be formed in the mold frame ( Prevent vertical flow between the 110 and the LCD panel 150.

Meanwhile, guide protrusions 146 for preventing the LCD panel 150 from being eccentric are formed at each corner of the upper surface of the sub-molded frame 140, and the LCD panel 150 is formed in the guide protrusions 146. Is installed.

The assembly process of the LCD module configured as described above is as follows.

First, the reflective sheet 120 reflecting light toward the LCD panel 150 is installed in the storage space 112 of the mold frame 110 with the lower surface closed and the upper surface opened, and the upper portion of the reflective sheet 120 is provided. The light guide plate 122 for guiding the incident light toward the LCD panel 150 is installed on the surface, and a lamp unit 124 for emitting light on the side surface in the width direction of the light guide plate 122 is installed.

Then, the optical sheets 130 for diffusing and condensing light on the upper surface of the light guide plate 122 to improve light utilization efficiency are stacked. In this case, as shown in FIG. 3, the alignment protrusions 132 formed at the short sides of the optical sheets 130 are aligned with the fixing grooves 117 formed at the short sides of the mold frame 110, and then the optical sheets 130. To lower the storage space 112 of the mold frame 110 to insert the fixing hole 134 into the fixing boss 118 as shown in Figure 4, the optical sheets 130 by shock or vibration This mold frame 110 is prevented from flowing in the horizontal direction.

When the optical sheets 130 are completely accommodated in the storage space () of the mold frame 110, the sub-frames 140 are coupled to the mold frame 110 so that the optical sheets 130 are molded by shock or vibration. Prevent vertical flow between the frame 110 and the LCD panel 150. That is, the short side of the sub mold frame 140 is positioned in a portion corresponding to the sub mold frame receiving groove 116 formed in the mold frame 110, and the fixing holes 144 formed in the sub mold frame 140 are molded in the mold frame. The sub mold frame 140 is lowered toward the mold frame 110 after alignment with the respective fixing bosses 118 formed in the 110. Then, as illustrated in FIG. 4, the rib receiving groove 142 formed on the long side of the sub mold frame 140 may surround the rib 114 formed on the long side of the mold frame 110 to support the lamp unit 124. The short side of the sub mold frame 140 is inserted into the sub mold frame receiving groove 116, and the fixing groove 144 is inserted into the fixing boss 118.

As described above, when the two sub mold frames 140 are coupled to both sides in the width direction of the mold frame 110, information is generated by the electric and optical properties in the guide protrusion 146 formed at the edge of the sub mold frame 140. Install the LCD panel 150, and cover the top chassis 160 from the upper surface of the LCD panel 150 to complete the assembly of the LCD module 100.

 As described above, when the LCD module is assembled, the sheet fixing holder, which is conventionally required, is eliminated in the present invention, thereby reducing the number of parts of the LCD module, thereby reducing raw material costs of the LCD module.

In addition, the assembly of the LCD module can be simplified by fixing the optical sheets using a mold frame and a sub mold frame instead of a sheet fixing holder.

Claims (4)

A mold frame having an accommodating space formed on an upper surface thereof, a fixing groove being formed in a rib formed along an edge of the accommodating space, and a fixing boss formed in the fixing groove; A reflection sheet installed in the storage space to reflect light upward; A light guide plate installed on an upper surface of the reflective sheet to guide incident light; A lamp unit installed at a side of the light guide plate to emit light; It is installed on the upper surface of the light guide plate to increase the use efficiency of the light, and extending from the side corresponding to the fixing groove to the outside of the storage space is fitted into the fixing groove and the fixing boss in the fixing projections Optical sheets having a first fixing hole formed in a portion corresponding to the first fitting hole and inserted into the fixing boss; The planar shape is formed in a "-" shape and are respectively coupled to one end and the other end in the width direction of the mold frame to fix the fixing protrusions of the optical sheets, and to the portions corresponding to the first fixing holes. A sub-mold frame having a second fixing hole inserted into the fixing boss; An LCD panel installed on an upper surface of the sub-molded frame to display information; And And a top chassis covering the top edge of the LCD panel to support the LCD panel. delete The LCD module of claim 1, wherein guide protrusions are formed at each corner of the upper surface of the sub-molded frame to prevent the LCD panel from being seated. The LCD module according to claim 1, wherein the ribs positioned at one side and the other side in the longitudinal direction of the mold frame are formed with a sub mold frame receiving groove for accommodating a short side of the sub mold frame.

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