KR20030033320A - Structure for back light assembly of liquid crystal display - Google Patents

Abstract

PURPOSE: A structure of a backlight assembly of a liquid crystal display device is provided to integrate a main supporting stand with a light guide panel for lightening the backlight assembly. CONSTITUTION: A structure of a backlight assembly of a liquid crystal display device includes a lamp(101) for generating light, a lamp housing(102) for fixing the lamps to a surface of a light guide panel(110), main supporting stand(100) integrated with the light guide panel, first and second prism sheets(105,106) inserted between the light guide panel and a liquid crystal display panel, and a reflecting plate(103) facing the optical sheets.

Description

STRUCTURE FOR BACK LIGHT ASSEMBLY OF LIQUID CRYSTAL DISPLAY}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight assembly structure of a liquid crystal display device, and more particularly, to a backlight assembly structure of a liquid crystal display device in which a main supporter and a light guide panel, which are components of a backlight assembly, can be integrated.

Cathode ray tube (CRT), one of the widely used display devices, is mainly used for monitors such as TVs, measuring devices, information terminal devices, etc. And it could not respond actively to the request of weight reduction.

Accordingly, liquid crystal displays having advantages of small size, light weight, and low power consumption have been actively developed in order to replace the cathode ray tube, and recently, the liquid crystal display has been developed enough to perform a role as a flat panel display, and the demand continues to increase. It is becoming.

Such a liquid crystal display device is a display device in which a data signal according to image information is individually supplied to liquid crystal cells arranged in a matrix form so as to display a desired image by adjusting the light transmittance of the liquid crystal cells. .

Accordingly, a liquid crystal display device includes: a liquid crystal panel in which liquid crystal cells forming a pixel unit are arranged in an active matrix form; A driver integrated circuit (IC) for driving the liquid crystal cells is provided, the liquid crystal panel comprising: an upper and lower substrate facing each other; It is made of a liquid crystal layer formed in the injection gap of the upper and lower substrates.

As described above, since the liquid crystal display does not emit light by itself and has a characteristic of displaying an image by adjusting light transmittance, a separate device, that is, a backlight assembly, for irradiating light to the liquid crystal panel is required.

A light source provided in the backlight assembly, that is, a lamp, is disposed on a bottom surface of the liquid crystal display to directly transmit light to the front surface of the liquid crystal panel, and is disposed on one side or both sides of the light guide plate so that the light is disposed on the light guide plate, the reflecting plate, and the like. The reflection, diffusion and condensation through the sheets are divided into an edge method for transmitting the front surface of the liquid crystal panel, and an edge method is mainly used.

However, since the edge method has a lower luminance than the direct method, an attempt is made to condense light by using a prism sheet to compensate for this.

Referring to the conventional backlight assembly as described above with reference to the exemplary view of Figure 1 as follows.

1, a light guide plate 2 for guiding light generated from a lamp 1; It is provided with a lamp housing (3) installed on the side of the light guide plate (2) in the form of surrounding the lamp (1). Here, the cold cathode tube is mainly used for the lamp 1.

The light generated by the lamp 1 is incident toward the side of the light guide plate 2, and the inner surface of the lamp housing 3 is processed to reflect light, so that light generated from the lamp 1 may be reflected by the light guide plate ( By reflecting toward the side of 2), the utilization of light generated in the lamp 1 is improved.

Meanwhile, the light guide plate 2 is formed of a plastic-based transparent material such as PMMA so as to have a panel shape of an inclined lower surface and a horizontal upper surface (or an inclined upper surface and a horizontal lower surface). As the photograph surface is provided with a plurality of dots or V-shaped grooves to uniformly reflect the light, the light generated from the lamp 1 is uniformly advanced upward through the upper surface.

In addition, a reflecting plate 4 is installed below the light guide plate 2, and a diffusion plate 5, first and second prism sheets 6 and 7, and a protective sheet 8 are sequentially installed above. do. Here, the reflector 4 reflects the light transmitted downward through the lower surface of the light guide plate 2 toward the light guide plate 2, thereby reducing the loss of light and improving the uniformity of the light transmitted above the light guide plate 2. Contribute to improvement.

Thus, the light guide plate 2 guides the light generated from the lamp 1 together with the reflecting plate 4 upwards.

In addition, the diffusion plate 5 provided between the light guide plate 2 and the first prism sheet 6 disperses the light incident from the light guide plate 2, so that spots due to partial concentration of light are not generated. In addition, the diffusion plate 5 also plays a role of vertically raising the direction of light traveling toward the first prism sheet 6.

In addition, the first prism sheet 6 has a flat lower surface and a corrugated surface corrugated in the front and rear directions, while the second prism sheet 7 has a flat lower surface and a corrugated surface corrugated in the left and right directions. Accordingly, the first prism sheet 6 condenses the light traveling toward the second prism sheet 7 in the front and rear directions, and the second prism sheet 7 condenses the light traveling toward the protective sheet 8 in the left and right directions. As a result, the light propagating from the diffusion plate 5 toward the protective sheet 8 is raised so that it can proceed vertically.

Accordingly, the light passing through the first and second prism sheets 6 and 7 proceeds vertically and is uniformly distributed with respect to the entire surface of the protective sheet 8, thereby improving luminance.

The protective sheet 8 is formed on the uppermost layer of the backlight assembly to protect the lower sheets sensitive to dust or scratches and to prevent the flow of the lower sheets when only the backlight assembly is transported. In addition, the light distribution may have a property of diffusing light to make the distribution of light more uniform.

The main support 9 may include the lamp 1, the light guide plate 2, the lamp housing 3, the reflector 4, the diffuser plate 5, the first and second prism sheets 6 and 7, In addition to supporting the protective sheet (8) serves to seat each member.

Accordingly, the main support 9 is provided with ribs 10 to effectively support the members, and also has seating portions of the members for effectively seating the members.

On the other hand, the main support (9) is manufactured through injection in consideration so that the lip 10 and the seating portion of each member can be provided in advance.

Referring to the main support 9 as described above in more detail with reference to the exemplary view of Figures 2a and 2b as follows.

Figure 2a is an exemplary view showing a planar configuration of the main support 9, Figure 2b is an exemplary view showing a cross-sectional configuration taken along the line II 'of Figure 2a.

2A and 2B, the main support 9 is provided with a lip 10 to support the entire liquid crystal display, a mounting portion 30 for the reflecting plate and the light guide plate, and a diffusion plate and a first plate. And mounting portions 40 of the second prism sheets and the protective sheets, and finally, the mounting portions 50 of the liquid crystal panel are provided.

In this case, a lamp housing surrounding the lamp should be installed on one side of the light guide plate. Accordingly, one side of the light guide plate and the opposite surface of the main support 9 are spaced apart from each other, and the mounting portion 60 of the lamp housing is provided in the spaced apart area.

Meanwhile, FIG. 3 is an exemplary view showing that the members of the backlight assembly are seated on the cross section of the main support 9 shown in FIG. 2B. The same reference numerals are used for the same objects as those of FIG. Is applied.

Referring to Figure 3, the main support (9) is provided with a lip 10 to support the entire liquid crystal display, the light guide plate (2) having a lamp housing (3) attached to the side, including a lamp (1), The reflecting plate 4, the diffusion plate 5, the first and second prism sheets 6 and 7 and the protective sheet 8 are housed in the corresponding mounting portions 30 and 40 shown in Fig. 2B.

Then, on the protective sheet 8, the liquid crystal panel 20 is accommodated in the seating portion 50 shown in Fig. 2B of the main support 9.

Then, a top case 21 is installed to press and fix the entire upper edge of the liquid crystal panel 20.

Referring to the operation of the conventional backlight assembly configured as described above are as follows.

First, the light generated by the lamp 1 proceeds directly to the light guide plate 2 or is reflected by the lamp housing 3 to the light guide plate 2.

Then, a part of the light incident on the light guide plate 2 passes through the light guide plate 2 and proceeds upward, and the other part is reflected by the reflection plate 4 provided under the light guide plate 2, and then the light guide plate 2 Proceeds to the top through).

In addition, the light propagated through the light guide plate 2 is uniformly diffused while passing through the diffusion plates 5, the first and second prism sheets 6 and 7, and the protective sheets 8, and the luminance is improved. And incident on each pixel of the liquid crystal panel 20.

However, the structure of the backlight assembly of the conventional liquid crystal display device as described above has a problem in that the material cost for manufacturing the corresponding members increases as the number of members to be provided increases, and in particular, the entire liquid crystal display device may be supported. The lip 10 provided in the main support 9 serves to increase the weight of the liquid crystal display device, thereby not satisfying the desire of the consumer to improve portability through light weight of the product. have.

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems as described above, and an object of the present invention is to integrate the main support and the light guide plate, which is a part of the backlight assembly, thereby reducing the material cost and weight of the liquid crystal display device. The present invention provides a backlight assembly structure of a liquid crystal display device capable of reducing the weight of the product through reduction.

1 is an exemplary view showing a conventional backlight assembly.

Figure 2a is an exemplary view showing a planar configuration of the main support in Figure 1;

Figure 2b is an exemplary view showing a cross-sectional configuration cut along the line II 'of Figure 2a.

FIG. 3 is an exemplary view showing each member of the backlight assembly seated on a cross section of the main support shown in FIG. 2B; FIG.

Figure 4a is an exemplary view showing a planar configuration of the light guide plate and the main support made of an integrated frame according to an embodiment of the present invention.

Figure 4b is an exemplary view showing a cross-sectional configuration cut along the line II-II 'of Figure 4a.

FIG. 5 is an exemplary view showing each member of the backlight assembly seated on a cross section of the main support shown in FIG. 4B; FIG.

6 is an exemplary view showing an example in which the lamp housing is omitted by processing one side of the reflector shown in FIG. 5 in a U shape.

*** Explanation of symbols for main parts of drawing ***

100: main support 101: lamp

102: lamp housing 103: reflecting plate

104: diffusion plate 105, 106: first, second prism sheets

107: Protection sheet 108: Liquid crystal panel

109: top case 110: light guide plate

120: connector

The backlight assembly structure of the liquid crystal display device for achieving the object of the present invention as described above comprises a lamp for generating light; A lamp housing fixedly attaching the lamp to one side of the light guide plate; A main support made of the light guide plate and an integrated frame; Optical sheets inserted between the light guide plate and the liquid crystal panel; The light guide plate is disposed therebetween, and the reflective plate is disposed at a position facing the optical sheets.

The backlight assembly structure of the liquid crystal display according to the present invention as described above will be described in detail with reference to the accompanying drawings.

First, Figure 4a is an exemplary view showing a planar configuration of the light guide plate and the main support made of an integrated frame according to an embodiment of the present invention, Figure 4b is a cross-sectional configuration cut along the line II-II 'of Figure 4a. It is an illustration.

4A and 4B, a main support 100 having a rectangular band frame and a light guide plate 110 having a rectangular plate shape inside the main support 100 are integrally manufactured by a plurality of connection parts 120. It is.

In this case, since the main support 100 and the light guide plate 110 should be made of different materials selected to properly perform their respective functions, the main support 100 and the light guide plate 110 may be manufactured integrally by double injection.

As the light guide plate 110 is fixed to the main support 100 by the connection part 120, the light guide plate 110 can properly support each member of the backlight assembly. It is possible to remove the lip provided in the.

Therefore, the weight of the backlight assembly can be reduced, and the material cost of manufacturing the product can be reduced.

Meanwhile, since the width of the light guide plate 110 is relatively wider than the width of the connection part 120, the spaces 130 and 130 ′ of the main support 100 and the light guide plate 110 are provided.

Thus, one side space 130 of the main support 100 and the light guide plate 110 may be used as a mounting portion of the U-shaped lamp housing for fixing and fixing the lamp to one side of the light guide plate 110. It is preferable that the 100 is manufactured to extend under the light guide plate 110 to support the U-shaped lamp housing.

In addition, the main support 100 is provided with a mounting portion 140 for the reflecting plate, the diffusion plate, the prism sheets, and the mounting portion 150 of the protective sheet is provided, and finally the mounting portion 160 of the liquid crystal panel ) Is provided.

In this case, the mounting plate 150 of the diffusion plate, the prism sheets, and the protective sheet provided in the main support 100 may have the same step as the light guide plate 110 manufactured integrally with the main support 100. . In this case, the diffusion plate, the prism sheets, and the protective sheet can be supported and seated more stably.

On the other hand, Figure 5 is an exemplary view showing a state in which each member of the backlight assembly is seated on the cross section of the main support 100 shown in FIG.

Referring to FIG. 5, the light guide plate 110 is integrally fixed to the main support 100 by the connection part 120 to support the entire liquid crystal display.

In addition, the main support 100 accommodates the diffusion plate 104, the first and second prism sheets 105 and 106, and the protective sheet 107 in the seating part 150 shown in FIG. 4B. In this case, as illustrated in FIG. 4B, the seating part 150 is formed on the main support 100 to have the same level as that of the light guide plate 110, so that the diffusion plate 104, the first and second prism sheets ( 105, 106, and the protective sheet 107 can be supported and seated more stably.

In addition, a U-shaped lamp housing 102 surrounding the lamp 101 is seated in the main support 100 shown in FIG. 4B and one side space 130 of the light guide plate 110. In this case, in order to further improve the luminance of the liquid crystal display, the lamp 101 may be formed in the spaces 130 and 130 ′ on both sides of the light guide plate 110. Accordingly, the lamp housing 102 may be formed in the main support shown in FIG. 4B. It may be seated in the spaces 130 and 130 ′ on both sides of the 100 and the light guide plate 110.

In addition, the reflecting plate 103 is mounted on the mounting portion 140 shown in Fig. 4B.

Then, on the protective sheet 107, the liquid crystal panel 108 is seated on the mounting portion 160 shown in Fig. 4b.

Then, the top case 109 is installed to press and fix the entire upper edge of the liquid crystal panel 108.

6 is an exemplary view showing an example in which the lamp housing 102 shown in FIG. 5 is omitted by processing one side of the reflector 103 in a U shape.

Referring to Fig. 6, one side portion of the reflecting plate 103 is extended to form a U-shape surrounding the lamp 101, and the lamp housing 102 shown in Fig. 5 is removed.

That is, by processing one side of the reflective plate 103 to perform the function of the lamp housing 102 shown in Figure 5, it is possible to reduce the convenience of manufacturing and waste of material.

The reflection plate 103 reflects the light incident on the light guide plate 110 when the light does not travel in the direction of the liquid crystal panel 108 to proceed toward the liquid crystal panel 108, thereby reducing the loss of light and further reducing the light guide plate ( It contributes to improving the uniformity of the light traveling from the 110 toward the liquid crystal panel 108.

In addition, the U-shaped lamp housing 102 shown in FIG. 5 is processed to reflect the light on the inner surface thereof, thereby reflecting the light generated from the lamp 101 to the side surface of the light guide plate 110, thereby providing a lamp 101. Contributes to improving the utilization of light generated in

That is, the reflector plate 103 and the lamp housing 102 must be processed to reflect light in common, and the lamp housing 102 is manufactured in a U shape surrounding the lamp 101.

Therefore, when one side of the reflector plate 103 is machined to surround the lamp 101, the reflector plate 103 can perform the function of the lamp housing 102 at the same time to remove the lamp housing 102. You can do it.

As described above, the backlight assembly structure of the liquid crystal display device according to the present invention may reduce the cost of the backlight assembly by manufacturing the main support and the light guide plate as an integrated frame, and reduce the material cost according to the production of the product.

Therefore, there is a favorable effect on the price competitiveness through the reduction of the unit cost of the product, the portability is improved through the weight of the product has the effect that can satisfy the needs of consumers.

Claims (10)

A lamp for generating light; A lamp housing fixedly attaching the lamp to one side of the light guide plate; A main support made of the light guide plate and an integrated frame; Optical sheets inserted between the light guide plate and the liquid crystal panel; And a reflection plate disposed at a position facing the optical sheets with the light guide plate therebetween. The backlight assembly structure of claim 1, wherein the optical sheets comprise a diffusion plate, a prism sheet, and a protective sheet sequentially stacked between the light guide plate and the liquid crystal panel. The backlight assembly structure of claim 1, wherein the main support manufactured from the light guide plate and the integrated frame is manufactured by double injection. The main support of claim 3, wherein the main support is made of an integral frame with the light guide plate. The main support has a rectangular band shape, a light guide plate having a rectangular plate shape, and a light guide plate having a rectangular plate shape inside the square support main body. The backlight assembly structure of the liquid crystal display device, characterized in that composed of a plurality of connecting parts to be fixed. The backlight assembly structure of claim 4, wherein the width of the light guide plate is wider than that of the connection part. The backlight assembly structure of claim 5, wherein a lamp housing is mounted in a space between the main support and the light guide plate provided as the width of the light guide plate is wider than that of the connection part. A lamp for generating light; A lamp housing fixedly attaching the lamp to one side of the light guide plate; A diffusion plate and a prism sheet laminated between the light guide plate and the liquid crystal panel; A protective sheet provided between the prism sheet and the liquid crystal panel; A reflection plate disposed at a position facing the diffusion plate with the light guide plate therebetween; A main support made of an integrated frame with the light guide plate and provided with seating parts of the members; And a top case configured to press and fix an edge of the liquid crystal panel. The backlight assembly structure of claim 7, wherein the mounting parts of the diffusion plate, the prism sheet, and the protection sheet provided on the main support have the same level as that of the light guide plate. A lamp for generating light toward the side of the light guide plate; A main support made of the light guide plate and an integrated frame; Optical sheets inserted between the light guide plate and the liquid crystal panel; The light guide plate is disposed between the optical sheets, and is disposed at a position facing the optical sheets, and has a reflective plate configured to fix and attach the lamp to the side surface of the light guide plate by being processed in a U shape to extend one side to surround the lamp. The backlight assembly structure of the liquid crystal display device characterized in that. A lamp for generating light toward the side of the light guide plate; A diffusion plate and a prism sheet laminated between the light guide plate and the liquid crystal panel; A protective sheet provided between the prism sheet and the liquid crystal panel; A reflection plate installed at a position facing the diffuser plate with the light guide plate interposed therebetween, and having one side extended to process the U shape to surround the lamp, thereby fixing the lamp to the side of the light guide plate; A main support made of an integrated frame with the light guide plate and provided with seating parts of the members; And a top case configured to press and fix an edge of the liquid crystal panel.