KR20040062178A - Lcd backlight assembly - Google Patents

Abstract

PURPOSE: An LCD(liquid crystal display) assembly is provided to prevent mis-alignment of a main frame and a light guide. CONSTITUTION: An LCD includes an LCD panel(105), a back light assembly composed of optical sheets(111), a light guide(115), a back light and a reflecting plate(117), a main frame(121), a lower cover(122) and a top case. A combining part(200) is arranged on the light guide and a combining hole(250) is located on the main frame such that the combining part and the combining hole are combined with each other. The combining part includes protrusions respectively arranged on four corners of the light guide. The combining part is a protrusion formed on the light guide along the edge of the light guide.

Description

Liquid Crystal Display Assembly {LCD BACKLIGHT ASSEMBLY}

The present invention relates to a liquid crystal display backlight assembly, and more particularly, to a liquid crystal display backlight assembly that can prevent the pressing and the inflow of foreign matters of the backlight assemblies that are stacked and coupled under the main frame.

Recently, due to the rapid development of technology in the semiconductor industry, liquid crystal display devices are being manufactured with smaller and lighter weight and more powerful products. Cathode ray tube (CRT), which is widely used in information display devices, has many advantages in terms of performance and price, but has many disadvantages in terms of miniaturization or portability.

On the other hand, liquid crystal displays have been attracting attention as an alternative means of overcoming the shortcomings of CRTs because they have advantages such as miniaturization, light weight, and low power consumption. Currently, almost all information processing devices that require display devices are required. The situation is attached to.

Such liquid crystal displays generally apply voltages to specific molecular arrays of liquid crystals to convert them into other molecular arrays, and change optical properties such as birefringence, photoreactivity, dichroism, and light scattering characteristics of liquid crystal cells that emit light by such molecular arrays Is a display device using modulation of light by a liquid crystal cell by converting the light into a visual change.

Recently, various structures have been developed for slimming and lightening in order to secure the competitiveness of the product. One of them stacks and combines the backlight assemblies, which are optical units, on the liquid crystal display panel in which the array substrate and the color filter substrate are bonded together, and inserts them into the main frame to protect them. A display mold frame structure is fabricated.

The PCB for applying a signal to the gate pad and the data pad formed at the edge of the display panel is connected with the flexible cable by TCP to which the drive IC is bonded, and is attached to the rear surface of the main frame of the liquid crystal display.

FIG. 1 is a view illustrating components assembled to a main frame of a liquid crystal display generally.

As shown in FIG. 1, the backlight assembly is connected to a liquid crystal panel 5 in which an array substrate having a plurality of pixels in a matrix form and a color filter substrate in which R, G, and B color filters are formed in a matrix form are bonded together. It is stacked and stored in the main frame.

A gate printed circuit board (PCB) 7 for applying a driving signal is provided at one edge of the liquid crystal panel 5 with a gate pad of the liquid crystal panel 5 interposed between the gate pad and a gated taper package (TCP). It is connected by a (flexible cable).

Similarly, at the other edge of the liquid crystal panel 5, a data printed circuit board (PCB) 9 for applying a graphic signal is connected to a data pad of the liquid crystal display panel 5 by a flexible cable. Data TCP is attached to apply a signal to the liquid crystal panel 5 according to a certain scanning method.

Under the liquid crystal panel 5, a plurality of optical sheets 11 and a backlight 13 for generating light for representing an image, and the light generated from the backlight 13 are plane light of an area of the liquid crystal panel 5. The backlight assembly 10 including the light guide plate 15 to be replaced with the light reflection plate 17 for reflecting the light leaked from the light guide plate 15 and increasing the light efficiency is attached in a stacked form.

The backlight assembly 10 and the liquid crystal panel 5 are inserted in a stacked form on the main frame 21 for optical alignment while protecting from external shock. In order to prevent movement of the liquid crystal panel 5, a guide panel 3 capable of fixing the liquid crystal panel 5 is attached.

The main frame 21 is divided into a metal material or a plastic material, and the liquid crystal panel 5 and the backlight assembly 10 are inserted into the main frame 21 in a stacked form, and then the panel The guide 3 is coupled to the main frame 21.

Thereafter, an upper case 1 and a lower cover 22 are assembled to the liquid crystal panel 5 and the main frame 21 in which the backlight assembly 10 is accommodated.

The upper case 1 and the lower cover 22 serve to ground the PCB connected to the liquid crystal display panel while protecting the liquid crystal display panel and the backlight assembly.

2 is an assembled structure of a main frame and a backlight assembly of a liquid crystal display according to the related art.

As shown in FIG. 2, the liquid crystal panel 5 is mounted on the main frame 21, and the rear surface of the main frame 21 is provided with optical sheets 11, a backlight (not shown), The backlight assembly composed of the light guide plate 15 and the reflector plate 17 is stacked and bonded.

When the backlight assembly including the optical sheets 11, the backlight, the light guide plate 15, and the reflector plate 17 is coupled to the main frame 21, the lower cover 22 is coupled to the rear surface of the main frame 21. .

The lower cover 22 serves to protect the optical elements of the liquid crystal display while serving as a ground of the PCB substrates connected to the liquid crystal panel 5.

As shown in the drawing, when the screw 20 is coupled along the main frame 21 and the lower cover 22 is coupled, the upper case 1 is combined to complete one liquid crystal display device. .

The center of the main frame 21 is open to reach the liquid crystal panel 5 in which the planar light generated from the backlight assembly is seated on the main frame 21. The main frame 21 is structured to be constantly fixed along the circumference of the backlight assembly.

The main frame 21 serves as a fixture for accommodating the liquid crystal panel 5, backlight assemblies, and an optical alignment of the received backlight assemblies.

Therefore, when the liquid crystal panel 5 is displayed, in order to obtain a high quality image, the plane light generated in the backlight assembly effectively reaches the liquid crystal panel 5, and light leakage is not generated along the edge.

The upper case 1 and the lower cover 22 serve as the ground of the PCB connected to the liquid crystal panel 5, and the optical elements of the liquid crystal display device coupled to the main frame 21 may be impacted by an external impact, It protects against vibration.

However, the main frame and the backlight assembly of the liquid crystal display having the structure as described above have a problem in that the foreign sheets are pressed by the edges of the main frame or foreign matters are introduced by the edges of the main frame during the bonding of the lower cover and the upper case.

3A and 3B illustrate a state in which the backlight assembly is pressed and foreign matters are introduced in the LCD according to the related art.

As shown in FIG. 3A, the liquid crystal panel 5 is seated on the main frame 21, and the backlight assemblies such as the optical sheets 11, the light guide plate 15 including the backlight, and the reflector plate 17 are disposed on the rear surface. Are combined.

When the liquid crystal panel 5 and the backlight assembly are combined as described above, the lower cover 22 is assembled to cover the rear surface of the main frame 21. The lower cover 22 to be assembled is coupled to the main frame 21 by a screw 20, the main frame due to the coupling of the screw 20, the poor dimension of the main frame 21 and the backlight assembly. The failure of 21 to press the optical sheets 11 to cause wrinkles occurs.

As described above, the optical paths of the light guide plate 15 are pressed by the optical sheets 11 to be different, thereby degrading the image quality.

In addition, as shown in Figure 3b, the coupling of the screw 20 for coupling the lower cover 22 and the main frame 21 or the optical sheet 11 and the main due to poor dimensionality during casting When a gap is formed in the area where the frame 21 is in contact with the foreign material, not only the foreign matter flows into the backlight assembly area, but also the misalignment of the optical sheets 11 due to vibration or shock during movement. There is a problem that is caused.

The present invention provides a liquid crystal display backlight assembly that can prevent foreign substances from entering or pressing of the optical sheets due to a misalignment between the main frame and the light guide plate in the process of combining the main frame and the backlight assembly of the liquid crystal display. The purpose is to provide.

1 is a view showing components generally assembled to the main frame of a liquid crystal display.

2 is an assembled structure of a main frame and a backlight assembly of a liquid crystal display according to the related art.

3A and 3B illustrate a state in which the backlight assembly is pressed and foreign matters are introduced in a liquid crystal display device assembled according to the related art.

4 is a view showing the structure of a light guide plate of the liquid crystal display according to the present invention;

5 is a view showing the structure of a light guide plate according to another embodiment of the present invention.

6 is a cross-sectional view showing a light guide plate coupled to the main frame according to the present invention.

7A and 7B are views illustrating a light guide plate structure coupled to a main frame according to another embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

100: coupling projection 111: optical sheet

115: Light guide plate 117: Reflector plate

133: backlight 200: coupling jaw

250, 300: coupling groove 350: coupling portion

In order to achieve the above object, the liquid crystal display backlight assembly according to the present invention,

A liquid crystal display device comprising a liquid crystal display panel, a backlight assembly composed of optical sheets, a light guide plate, a backlight, and a reflection plate, a main frame, a lower cover, and a top case.

The coupling part is disposed on the edge of the light guide plate, and the coupling groove is disposed on the main frame so as to correspond to the coupling part.

Here, the coupling portion disposed on the edge of the light guide plate is in the form of a coupling protrusion protruding on the four corners of the light guide plate edge, the coupling portion disposed on the edge of the light guide plate protruding along the rectangular edge of the light guide plate edge. The coupling jaw is formed, and the coupling part disposed on the edge of the light guide plate is characterized in that a plurality of coupling protrusions are arranged along the rectangular edge of the light guide plate edge.

In addition, the liquid crystal display backlight assembly according to another embodiment of the present invention,

A liquid crystal display device comprising a liquid crystal display panel, a backlight assembly composed of optical sheets, a light guide plate, a backlight, and a reflection plate, a main frame, a lower cover, and a top case.

The coupling groove is disposed along the edge of the light guide plate, and the coupling part is disposed on the main frame so as to correspond to the coupling groove.

Herein, the coupling grooves disposed on the edge of the light guide plate may have grooves formed on four corners of the edge of the light guide plate, and the coupling grooves disposed on the edge of the light guide plate may have grooves along a rectangular edge of the light guide plate edge. The coupling groove is formed on the edge of the light guide plate is characterized in that a plurality of coupling grooves are arranged along the rectangular edge of the light guide plate edge.

According to the present invention, among the backlight assemblies stacked on the bottom of the main frame of the liquid crystal display device, coupling protrusions, coupling jaws, and coupling grooves that can be coupled with the main frame are formed along edges of edges of the light guide plate, thereby improving assemblability. Foreign matter may be introduced into the assembly or the pressing of the optical sheets may be prevented.

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

4 is a view showing the structure of a light guide plate of the liquid crystal display according to the present invention.

As shown in FIG. 4, a backlight assembly is stacked and coupled to a lower side of the main frame on which the liquid crystal panel is seated on the upper side. The light guide plate structure of the backlight assembly and the structure of the main frame are modified to improve assemblability.

The coupling protrusions 100 are formed on four edges of the light guide plate 115 to serve as guides of the optical sheets 111, thereby improving assembling with the main frame.

That is, the coupling protrusions 100 formed on four corners of the light guide plate 115 correspond to four coupling grooves to be coupled to the main frame, so that the coupling protrusions 100 of the light guide plate 115 are assembled in the assembling process. ) And the coupling groove of the main frame.

According to the dimensions of the coupling protrusion 100 of the light guide plate 115, the backlight assemblies are accurately positioned on the back of the main frame, and the coupling protrusions 100 serve to fix the movement of the optical sheets 111. The optical alignment is also improved.

Although the coupling protrusions 100 are formed at four corners of the light guide plate 115 in the drawing, in some cases, the coupling protrusions may be formed at regular intervals along the four corners.

Therefore, the number of coupling protrusions may be variously adjusted to prevent the main frame and the assembly and the optical sheets from being pressed.

As the coupling protrusions 100 are formed along the edges of the light guide plate 115, the edges of the optical sheets 111 stacked and disposed on the light guide plate 115 may be cut accordingly.

However, since the cut edge edges of the optical sheets are areas blocked by the main frame, they do not affect the displayed area of the liquid crystal panel.

5 illustrates a structure of a light guide plate according to another exemplary embodiment of the present invention.

As shown in FIG. 5, unlike the structure of the light guide plate illustrated in FIG. 4, a rectangular coupling jaw 200 is formed along the edge edge of the light guide plate 115, and a coupling groove is formed in the area of the main frame corresponding thereto. To form.

In the above structure, the backlight assembly and the main frame are coupled by the coupling jaw 200 and the coupling groove, and the height of the coupling jaw 200 is adjusted to adjust the coupling distance between the backlight assemblies and the main frame. Can be.

In addition, since the assembling property of the main frame and the backlight assembly may be improved, the coupling jaw 200 is formed along the circumference of the light guide plate 115 so that foreign matter does not flow into the backlight assembly area from the outside. .

Even when dimension defects occur in the manufacture of the main frame, the lower cover is assembled to the main frame because the coupling jaw 200 formed on the light guide plate 115 and the coupling groove formed on the main frame are assembled at a predetermined distance. When coupled to the rear surface, the phenomenon that the optical sheets of the backlight assembly are not pressed by the main frame does not occur.

6 is a cross-sectional view illustrating a light guide plate coupled to a main frame according to the present invention.

As shown in FIG. 6, the liquid crystal panel 105 is mounted on the main frame 121. The liquid crystal panel 105 is not shown in the figure but is not moved left and right by the panel guide.

In addition, a backlight assembly composed of optical sheets 111, a backlight (not shown), a light guide plate 115, and a reflector plate 117 is laminated and coupled to the rear of the main frame 121. The lower cover 122 is coupled to the rear surface of the main frame 121 by a screw 120 to protect it from the outside.

In this case, the coupling protrusion 100 or the coupling jaw 200 formed on the edge of the light guide plate 115 of the backlight assembly is coupled to the coupling groove 250 formed on the main frame 121.

Therefore, when assembling the lower cover 122, the coupling groove 100 or the coupling jaw 200 of the light guide plate 115 is coupled to the coupling groove 250 of the main frame 121 even when the screw 120 is excessively fastened. ) Is fastened and supported so that the optical sheets 111 of the backlight assembly by the main frame 121 are not pressed.

In addition, since the coupling jaw 200 of the light guide plate 115 and the coupling groove 250 of the main frame 121 are coupled in a quadrangular shape, the foreign material is a region where the inner surface of the main frame 121 and the backlight assembly are located. Will not flow.

7A and 7B are views illustrating a light guide plate structure coupled to a main frame according to another embodiment of the present invention.

As shown in FIG. 7A, as shown in FIGS. 4 and 5, the coupling portion formed in the rectangular shape on the main frame does not form a coupling protrusion or coupling jaw for coupling on the edge of the light guide plate 215. The coupling groove 300 is formed to correspond to the edge of the light guide plate 215 of the backlight assembly.

On the edge edge of the light guide plate 215, the coupling groove 300 is formed to have a constant depth along a rectangular edge.

However, although not shown in the drawing, the coupling grooves 300 formed along the edge edge of the light guide plate 215 may be formed only four on the edge edge as described with reference to FIGS. 4 and 5 or along the edge edge. Multiple can be formed at regular intervals.

When the various defect grooves 300 are formed on the light guide plate as described above, the coupling portion on the main frame also has to form only four coupling protrusions or a plurality of coupling protrusions to correspond thereto.

Therefore, the coupling distance between the light guide plate 215 and the main frame is adjusted according to the height of the coupling part of the main frame corresponding to the coupling groove 300 formed along the edge edge of the light guide plate 215.

Such a structure can achieve an effect similar to that of the light guide plate shown in FIG. 5, which can improve the assemblability of the main frame and the backlight assembly as well as the coupling groove 300 formed around the edge of the light guide plate 215. Since the coupling part formed on the main frame is inserted into the foreign material, foreign matter does not flow into the backlight assembly area from the outside.

As shown in FIG. 7B, a liquid crystal panel 205 is mounted on the main frame 221, and optical sheets 211, a backlight (not shown), and a light guide plate 215 are disposed on the rear of the main frame 221. ), A backlight assembly composed of a reflector plate 217 is laminated and joined in order.

The lower cover 222 is coupled to the rear surface of the main frame 221 by a screw 220 to protect the backlight assembly from the outside.

In addition, the coupling groove 300 formed on the edge of the light guide plate 215 of the backlight assembly is coupled to the coupling portion 350 formed on the main frame 221. It serves to guide the optical sheets 211 of the backlight assembly to keep the optical alignment constant.

Therefore, when assembling the lower cover 222, even if the screw 220 is excessively fastened, the coupling distance with the light guide plate 215 is maintained by the coupling part 350 of the main frame 221. The optical sheets 211 of the backlight assembly by the main frame 221 are not pressed.

In addition, since the coupling groove 300 of the light guide plate 215 and the quadrangle coupling portion 350 formed on the main frame 221 are coupled, the foreign material is a region in which the inner side of the rear surface of the main frame 221 and the backlight assembly are located. Will not flow.

Therefore, in the present invention, it is possible to control the deterioration of the assembly due to the dimensional defects during the manufacture of the main frame, and to prevent foreign substances from flowing into the backlight assembly stacked inside the main frame back from the outside.

As described in detail above, the present invention improves the assemblability of the backlight assembly of the liquid crystal display and the main frame, thereby preventing foreign matter from entering the main frame.

In addition, there is an advantage that the pressing phenomenon of the optical sheets by the main frame can be prevented by improving the assemblability of the liquid crystal display device.

The present invention is not limited to the above-described embodiments, and various changes can be made by those skilled in the art without departing from the gist of the present invention as claimed in the following claims.

Claims (8)

A liquid crystal display device comprising a liquid crystal display panel, a backlight assembly composed of optical sheets, a light guide plate, a backlight, and a reflection plate, a main frame, a lower cover, and a top case. And a coupling groove disposed on an edge of the light guide plate, and a coupling groove disposed on the main frame to correspond to the coupling portion. The method of claim 1, And a coupling part disposed on the edge of the light guide plate, the coupling part protruding from four edges of the light guide plate edge. The method of claim 1, And a coupling part disposed on the edge of the light guide plate, the coupling part protruding along the rectangular edge of the light guide plate edge. The method according to claim 1 or 2, And a coupling part disposed on the edge of the light guide plate, wherein a plurality of coupling protrusions are disposed along a rectangular edge of the light guide plate edge. A liquid crystal display device comprising a liquid crystal display panel, a backlight assembly composed of optical sheets, a light guide plate, a backlight, and a reflection plate, a main frame, a lower cover, and a top case. And a coupling part disposed along an edge of the light guide plate, and a coupling part disposed on the main frame so as to correspond to the coupling groove. The method of claim 5, wherein And the coupling grooves disposed on the edges of the light guide plate have grooves formed on four edges of the edges of the light guide plate. The method of claim 5, wherein And a coupling groove disposed on the edge of the light guide plate having a groove formed along a square edge of the edge of the light guide plate. The method of claim 5, wherein The coupling groove disposed on the edge of the light guide plate is a plurality of coupling grooves are arranged along the rectangular edge of the light guide plate edge.