KR20110020050A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: A liquid crystal display is provided to have a purpose of supplying a narrow bezel and a light weight liquid crystal device. CONSTITUTION: A liquid crystal display device is comprised as follows. A narrow bezel design of a liquid crystal display device is realized by removing a side surface of a cover bottom(50) and attaching a edge of a cover bottom to a rear surface of a support main(30) through a adhesive material. A lighter weight liquid crystal device than existing liquid crystal device is possible by removing a rear surface of the cover bottom. At the same time, reducing manufacturing cost and simplifying a process are possible.

Description

Liquid crystal display device

The present invention relates to a liquid crystal display device, in particular narrow It relates to a narrow bezel and a lightweight liquid crystal display device.

In line with the recent information age, the display field has also been rapidly developed, and a liquid crystal display device (FPD) is a flat panel display device (FPD) having advantages of thinning, light weight, and low power consumption. LCD, plasma display panel device (PDP), electroluminescence display device (ELD), field emission display device (FED), etc. : It is rapidly replacing CRT.

Among them, LCDs are excellent in moving image display and are most actively used in notebooks, monitors, TVs, etc. due to high contrast ratio. The LCDs are devices that do not have their own light emitting elements. It requires a light source.

As a result, a backlight unit having a lamp is provided on the rear side to irradiate light toward the front of the liquid crystal panel, thereby realizing an image of identifiable luminance.

1 is an exploded perspective view of a general liquid crystal display device.

As illustrated, a general liquid crystal display device includes a liquid crystal panel 10, a backlight unit 20, a support main 30, a cover bottom 50, and a top cover 40.

The liquid crystal panel 10 is a part that plays a key role in image expression and is composed of first and second substrates 12 and 14 bonded to each other with a liquid crystal layer interposed therebetween. The printed circuit board 17 is connected to one side edge of the liquid crystal panel 10 through the connection member 15.

In addition, the backlight unit 20 is provided behind the liquid crystal panel 10.

In this case, the backlight unit 20 includes a lamp 24 arranged along the longitudinal direction of at least one edge of the support main 30, a white or silver reflecting plate 22 seated on the cover bottom 50, and the reflecting plate. It includes a light guide plate 26 seated on the 22 and the lamp 24 is located on one side and a plurality of optical sheets 28 interposed thereon.

The liquid crystal panel 10 and the backlight unit 20 have a top cover 40 surrounding the top edge of the liquid crystal panel 10 and a back surface of the backlight unit 20 in a state where the edges are surrounded by the support main 30 having a rectangular frame shape. Cover cover 50 to cover each is coupled in front and rear are integrated through the support main 30 as a medium.

As a result, the light emitted from the lamp 24 is incident on the light incident part of the light guide plate 26 and refracted in the direction of the liquid crystal panel 10, and processed to a high quality of uniform brightness while passing through the plurality of optical sheets 28. The liquid crystal panel 10 is incident on the liquid crystal panel 10.

As a result, the liquid crystal panel 10 displays an image to the outside.

On the other hand, the liquid crystal display device has recently been widely used, such as a desktop computer monitor and a wall-mounted television, as well as a portable computer. It is actively underway.

Therefore, a narrow bezel design of the outer edge of the non-light emitting area except for the effective light emitting area where an image is displayed is essential.

However, despite efforts to manufacture a liquid crystal display device with a narrow bezel and light weight, there are too many components constituting the liquid crystal display device, which hinders the narrow bezel and light weight of the liquid crystal display device.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a narrow bezel and a lightweight liquid crystal display device.

In order to achieve the object as described above, the present invention is a backlight unit; A liquid crystal panel seated on the backlight unit; A support frame having a rectangular frame shape surrounding an edge of the backlight unit and the liquid crystal panel; Provided is a liquid crystal display including a cover-like cover bottom having an edge attached to a rear surface of the support main through an adhesive material.

In this case, a protrusion is formed on a rear surface of the support main, a hole is formed at an edge of the cover bottom corresponding to the protrusion, and a guide groove is formed on a rear surface of the support main, and the cover bottom corresponding to the guide groove is formed. Guide jaws are formed at the edges.

In addition, the support main has a protrusion formed inwardly, and the liquid crystal panel is attached to the protrusion through an adhesive material, and includes a top cover covering the upper edge of the liquid crystal panel and being coupled to the support main. .

The backlight unit may be a side light method including a reflector, a light guide plate positioned on the reflector, a plurality of optical sheets interposed on the light guide plate, and a light source positioned at one side of the light guide plate. It is a direct light method comprising a reflector, a plurality of light sources arranged side by side on the reflecting plate, and a plurality of optical sheets interposed on the light source.

As described above, according to the present invention, the side of the cover bottom is removed and the edge of the cover bottom is attached to the back side of the support main through the adhesive material, so that the narrow bezel design of the liquid crystal display device can be realized. .

In addition, by eliminating the side surface of the metal cover cover, it is possible to be lighter than the existing liquid crystal display device, it is possible to reduce the process cost.

In addition, it is possible to omit the process of assembling the existing top cover and cover bottom assembly has the effect of simplifying the process.

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

The present invention can be applied to mobile phones, digital multimedia broadcasting (DMB) terminals, small liquid crystal display devices mounted on PDAs (personal digital assistants) and digital cameras, and large liquid crystal display devices used in TVs or computer monitors. In the following, a small liquid crystal display manufactured to 5 inches or less will be described as an example.

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

As shown, the liquid crystal display device includes a liquid crystal panel 110, a backlight unit 120, a support main 130, a cover bottom 150, and a top cover 140, which will be described in detail. .

First, the liquid crystal panel 110 plays a key role in image expression and includes a first substrate 112 and a second substrate 114 bonded to each other with the liquid crystal layer interposed therebetween.

In this case, under the premise of an active matrix method, a plurality of gate lines and data lines intersect each other and a pixel is defined on an inner surface of the first substrate 112, which is commonly referred to as an array substrate, at each intersection point. A thin film transistor (TFT) is provided and is connected one-to-one with a transparent pixel electrode formed in each pixel.

An inner surface of the second substrate 114, called a color filter substrate, includes color filters of red (R), green (G), and blue (B) colors, and respective color filters. A black matrix is provided to cover non-display elements such as gate lines, data lines, and thin film transistors.

In addition, a transparent common electrode covering each color filter and a black matrix is provided on an inner surface of the second substrate 114.

A polarizer (not shown) for selectively transmitting only specific light is attached to the outer surfaces of the first and second substrates 112 and 114, respectively.

Meanwhile, the printed circuit board 117 is provided through the connection member 115 along at least one edge of the liquid crystal panel 110.

In the liquid crystal panel 110 having the above-described structure, when the thin film transistor selected for each gate line is turned on by the on / off signal of the gate driver circuit which is scanned and transmitted, the signal voltage of the data driver circuit becomes data. The direction of the liquid crystal molecules in the liquid crystal layer is changed by the electric field between the pixel electrode and the common electrode.

In addition, the liquid crystal display according to the present invention is provided with a backlight unit 120 for supplying light from its rear surface such that the difference in transmittance of the liquid crystal panel 110 is expressed to the outside.

The backlight unit 120 includes a lamp 124 arranged along at least one edge length direction of the support main 130, a white or silver reflecting plate 122, and a light guide plate 126 mounted on the reflecting plate 122. And a plurality of optical sheets 128 interposed thereon.

Although not shown in the drawings, the light shielding tape may further include a light shielding tape between the plurality of optical sheets 128 and the liquid crystal panel 110 to prevent light from leaking to portions outside the screen display area of the liquid crystal panel 110.

In addition, a lamp guide for guiding the lamp 124 is further provided. The lamp guide surrounds the upper and lower sides of the lamp 124 with the inner side facing the light guide plate 126 open and the light, together with the protection of the lamp 124. Is concentrated in the direction of the light guide plate 126.

In this case, as the light source, the lamp 124 may be a fluorescent lamp such as a cold cathode fluorescent lamp or an external electrode fluorescent lamp. Alternatively, in addition to the fluorescent lamp, a light-emitting diode lamp may be used as the lamp 124. When the light-emitting diode lamp is used, the lamp guide may be omitted.

The light guide plate 126 evenly spreads the light incident from the lamp 124 to a wide area of the light guide plate 126 while traveling through the light guide plate 126 by a plurality of total reflections to provide a surface light source to the liquid crystal panel 110.

The light guide plate 126 may include a pattern of a specific shape on the rear surface to supply a uniform surface light source.

Here, the pattern may be configured in various ways, such as an elliptical pattern, a polygonal pattern, a hologram pattern, and the like to guide light incident to the light guide plate 126. The pattern is formed on the lower surface of the light guide plate 126 by a printing method or an injection method.

In addition, the reflector plate 122 is positioned on the rear surface of the light guide plate 126 to improve the brightness of the light by reflecting the light passing through the rear surface of the light guide plate 126 toward the liquid crystal panel 110.

The plurality of optical sheets 128 on the light guide plate 126 include a diffusion sheet and at least one light collecting sheet.

Here, the diffusion sheet is positioned directly on the light guide plate 126, and serves to adjust the direction of light so that the light propagates toward the light collecting sheet while dispersing light incident through the light guide plate 126.

The light diffused through the diffusion sheet by the light collecting sheet is focused in the direction of the liquid crystal panel 110. As a result, the light passing through the light collecting sheet is almost perpendicular to the liquid crystal panel 110.

Meanwhile, the backlight unit 120 having the above-described structure is called a side light method, and a plurality of lamps 124 may be arranged in a plurality of layers along an inner length direction of one edge of the support main 130. It is also possible to arrange them side by side along the inner longitudinal direction of both edges of the main 130 facing each other.

The liquid crystal panel 110 and the backlight unit 120 are modularized through the top cover 140, the support main 130, and the cover bottom 150.

Here, the top cover 140 is a rectangular frame having a cross section bent in a "b" shape so as to cover the top and side edges of the liquid crystal panel 110, and opens the front surface of the top cover 140 to form a liquid crystal. It is configured to display an image implemented in the panel 110.

In addition, the support main 130 has a rectangular frame having a protrusion formed therein for distinguishing the positions of the liquid crystal panel 110 and the backlight unit 120, and has two edges of the liquid crystal panel 110 and the backlight unit 120. It is assembled and fastened with the top cover 140.

In particular, the liquid crystal panel 110 and the backlight unit 120 of the present invention, the cover bottom 150, which is the basis for assembling the entire apparatus of the liquid crystal display device, is formed in a single plate shape having a rectangular shape, such as a double-sided tape. It is attached and fixed to the support main 130 through an adhesive material (not shown).

Through this, the present invention enables the narrow bezel and the light weight of the liquid crystal display device, which leads to the simplification of the process. In addition, the process cost can be reduced. We will discuss this in more detail later.

In this case, the top cover 140 may also be referred to as a case top or a top case, and the support main 130 may also be referred to as a guide panel, a main support, or a mold frame, and the cover bottom 150 may be referred to as a bottom cover or a lower cover. It is also built.

3A to 3B are cross-sectional views schematically illustrating some cross sections of FIG. 2.

As shown in FIG. 3A, a reflector 122, a light guide plate 126, a lamp (not shown) provided on one side of the light guide plate 126, and a plurality of optical sheets 128 on the light guide plate 126. These are stacked to form the backlight unit 120.

In addition, the liquid crystal panel 110 having a liquid crystal layer (not shown) is disposed between the backlight unit 120 and the first and second substrates 112 and 114 and the first and second substrates 112 and 114. On each of the outer surfaces of the 112 and 114, polarizing plates 119a and 119b for selectively transmitting only specific light are attached.

The backlight unit 120 and the liquid crystal panel 110 have an edge surrounded by the support main 130, and the top cover 140 covering the upper edge and the side of the liquid crystal panel 110 is supported by the support main 130. )

In this case, the support main 130 protrudes vertically into the vertical portion 130a and the vertical portion 130a having a rectangular frame shape having a predetermined thickness covering the edges of the liquid crystal panel 110 and the backlight unit 120. The protrusion 130b may be configured to distinguish the positions of the liquid crystal panel 110 and the backlight unit 120.

Therefore, the liquid crystal panel 110 is seated and supported on the protrusion 130b, and the liquid crystal panel 110 and the backlight unit 120 are surrounded by the vertical portion 130a.

In addition, the cover bottom 150 of the present invention has a rectangular plate shape, and its edge portion is in contact with the vertical portion 130a of the support main body 130 having a rectangular frame shape and attached to the support main body 130.

That is, the edge of the cover bottom 150 is defined as the upper surface of the back surface of the support main body 130, that is, the one surface facing the liquid crystal panel 110 of the vertical portion 130a as the upper surface of the support surface 130. It is attached and secured through an adhesive material 200 such as a tape.

Through this, narrow bezel and light weight of the liquid crystal display are possible.

Looking at this in more detail, the following table (1) shows the thickness of the top cover 140, the support main 130 and the cover bottom 150 for modularizing the liquid crystal panel 110 and the backlight unit 120 (d1, d2) , d3).

In this case, the thickness d2 of the support main 130 refers to the thickness of the vertical portion 130a of the support main 130.

In general, the cover bottom 150 and the top cover 140, which are the mechanisms for the modularization of the liquid crystal display, are made of a metal material, and the support main 130 is formed through an injection molding process using a mold of synthetic resin.

Therefore, due to limitations in the injection molding process, as shown in Table 1, the cover bottom 150 and the top cover 140 made of a metal material have a thickness d1 and d3 of at least 0.2 to 0.3 mm. The support main 130 made of a molded product of synthetic resin is formed to have a thickness d2 of at least 0.4 to 0.6 mm.

Thickness (mm) Support main 0.4 to 0.6 Cover 0.2 to 0.3 Top cover 0.2 to 0.3

Table (1)

In addition, the mechanisms for modularizing the liquid crystal display device include the support main 130 and the cover bottom 150 assembled and fastened to each other in the bezel area of the outer edge of the non-light emitting area of the liquid crystal display device. The 140 is integrated by assembling and fastening to each other.

At this time, the table (2) is a table showing the assembly tolerance that occurs in the process of the support main 130, the cover bottom 150 and the top cover 140 is assembled.

Assembly Tolerance (mm) Support Main and Cover Bottom 0.1 Cover Bottom and Top Cover 0.1

 Table (2)

Accordingly, the bezel area of the liquid crystal display device may include at least the top cover 140, the support main 130, and the thicknesses d1, d2, and d3 of the cover bottom 150 between the support main 130 and the cover bottom 150. The assembly tolerance and the sum of the assembly tolerance between the cover bottom 150 and the top cover 140.

That is, the bezel area of the liquid crystal display device has a thickness of 1 to 1.4 mm.

Here, in the present invention, the support main 130 and the cover bottom 150 are assembled and fastened to each other, and the cover bottom 150 and the top cover 140 are assembled and fastened to each other, but the assembly thereof has various fastening methods. Can be assembled through.

However, the tolerance does not change between the support main 130 and the cover bottom 150 and the top cover 140 occurring during the process of assembling.

Accordingly, in the liquid crystal display of the present invention, the cover bottom 150 is formed in a plate shape, and the edge of the cover bottom 150 is perpendicular to the support main 130 through the adhesive material 200 such as a double-sided tape. By attaching and fixing to the back of the part 130a, the thicknesses (d1, d3) and top cover of the top cover 140 and the cover bottom 150 for assembling and coupling the existing top cover 140 and the cover bottom 150 Assembly tolerance between the 140 and the cover bottom 150 can be omitted.

That is, the bezel area of the liquid crystal display device corresponds only to the thicknesses d1 and d2 of the top cover and the support main 130 and the assembly tolerance between the support main 130 and the top cover 140, thereby providing a liquid crystal display of the present invention. The bezel area of the device will have a thickness of 0.7-1 mm.

As a result, the liquid crystal display of the present invention implements a narrow bezel design.

In addition, by removing the side of the cover bottom 150 made of a metal material, it is possible to be lighter than the liquid crystal display device including the cover bottom (50 of FIG. 1) is configured, the process cost can be reduced .

In addition, by attaching the cover bottom 150 directly to the back surface of the support main 130 through the adhesive material 200 such as a double-sided tape, the process of assembling and fastening the existing top cover 140 and the cover bottom 150 Compared to this, the process is simplified.

In this case, it is preferable that a separate structure for attaching the cover bottom 150 to the back of the support main 130 is provided. In particular, the process of attaching the cover bottom 150 to the back of the support main 130 is provided. If the worker proceeds by hand, its structure becomes more necessary.

Accordingly, the protrusion 131 is formed on the rear surface of the vertical portion 130a of the support main 130, and the hole 151 is formed in the cover bottom 150 corresponding to the hole 151 of the cover bottom 150. The protrusion 131 is inserted into the cover bottom 150 so that the cover bottom 150 is attached and fixed at the correct position of the rear surface of the support main 130.

Alternatively, as illustrated in FIG. 3B, the guide groove 133 is formed in the rear surface of the vertical portion 130a of the support main 130, and the guide jaw 153 is formed at the edge of the cover bottom 150 corresponding to the guide groove 133. As such, the guide groove 133 and the guide jaw 153 are coupled to each other, such that the cover bottom 150 may be attached and fixed at the correct position on the rear surface of the support main 130.

The front and rear surfaces of the cover bottom 150 attached to the rear surface of the support main 130 by the hole 151 and the guide jaw 153 of the cover bottom 150 may be checked.

4 is a cross-sectional view schematically showing a second embodiment including a cover bottom according to an embodiment of the present invention.

As shown, the reflective plate 322, the light guide plate 326, a lamp (not shown) provided on one side of the light guide plate 326, and a plurality of optical sheets 328 are stacked on the light guide plate 326. The backlight unit 320 is achieved.

In addition, the liquid crystal panel 310 having a liquid crystal layer (not shown) is disposed between the backlight unit 320 and the first and second substrates 312 and 314 and the first and second substrates 312 and 314. On each of the outer surfaces of the 312 and 314, polarizing plates 319a and 319b for selectively transmitting only specific light are attached.

The backlight unit 320 and the liquid crystal panel 310 are edged by the support main 330, and the cover bottom 350 is supported by an adhesive material 360 such as a double-sided tape. 330 is attached and secured and modularized.

In this case, the support main 330 protrudes vertically into the vertical portion 330a and the vertical portion 330a having a rectangular frame shape that surrounds the edges of the liquid crystal panel 310 and the backlight unit 320. ) And a protrusion 330b for distinguishing a position of the backlight unit 320.

Accordingly, the liquid crystal panel 310 is attached to the protrusion 330b through an adhesive material 370 such as a double-sided tape, and the liquid crystal panel 310 and the backlight unit 320 are edged by the vertical portion 330a. Will be surrounded.

In addition, the cover bottom 350 of the present invention has a rectangular plate shape, the edge portion of which is in contact with the vertical portion 330a of the support main 330 of the rectangular frame shape, through an adhesive material 360 such as a double-sided tape. It is attached and fixed to the support main 330.

That is, the liquid crystal panel 310 of the present invention is attached to the protrusion 330b of the support main 330 through the adhesive material 370, and the liquid crystal panel 310 and the backlight unit 320 are the support main 330. The edge is surrounded by) and the cover bottom 350 prevents detachment of the backlight unit 320.

As a result, the bezel area of the liquid crystal display device corresponds to the thickness d'2 of the support main 330, so that the bezel area of the liquid crystal display device of the present invention has a thickness of 0.4 to 0.6 mm.

As a result, the liquid crystal display of the present invention implements a narrow bezel design.

In addition, by removing the side surface of the metal top cover (140 in FIG. 3b) and the cover bottom 350, it is possible to be lighter than the conventional liquid crystal display device, it is possible to reduce the process cost.

In addition, the process of assembling and assembling the existing top cover (140 of FIG. 3B) and the cover bottom 350 may be omitted, thereby simplifying the process.

In this case, the protrusion 331 is formed on the rear surface of the vertical portion 330a of the support main 330, and the hole 351 is formed in the cover bottom 350 corresponding thereto. Through this cover cover 350 is to be attached and fixed at the correct position on the back of the support main (330).

Alternatively, although not shown in the drawing, a guide groove (133 of FIG. 3B) is formed inside the rear surface of the vertical portion 330a of the support main 330, and a guide jaw (FIG. 3B) is formed at the edge of the cover bottom 350 corresponding thereto. 153 of the guide groove (133 of FIG. 3b) and the guide jaw (153 of FIG. 3b) to be coupled to each other, so that the cover bottom 350 is attached and fixed at the correct position on the back of the support main 330 can do.

In this case, the cover bottom 350 may check the front and rear surfaces of the cover bottom 150 attached to the rear surface of the support main 330 by the hole 351 and the guide jaw (153 of FIG. 3B).

In this case, the backlight unit 320 having the above-described structure is commonly referred to as a side light method, and a direct light for arranging a plurality of lamps (not shown) side by side to the upper front surface of the reflector 322 according to the purpose. In this case, the light guide plate 326 may be omitted.

As described above, by removing the side surface of the cover bottom 350 and attaching the edge of the cover bottom 350 to the back surface of the support main 330 through the adhesive material 360, the narrow bezel of the liquid crystal display device The design can be implemented.

In addition, by removing the side surface of the metal cover cover 350, it is possible to be lighter than the existing liquid crystal display device, the process cost can be reduced, and the existing top cover (140 in FIG. 3b) and cover cover ( 350 can be omitted to assemble the fastening process, which leads to a simplification of the process.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

1 is an exploded perspective view of a general liquid crystal display device.

2 is an exploded perspective view showing a liquid crystal display device according to an embodiment of the present invention.

3A-3B are cross-sectional views schematically showing some cross sections of FIG.

Figure 4 is a schematic cross-sectional view of a second embodiment including a cover bottom according to an embodiment of the present invention.

Claims (7)

A backlight unit; A liquid crystal panel seated on the backlight unit; A support frame having a rectangular frame shape surrounding an edge of the backlight unit and the liquid crystal panel; Cover bottom of the plate shape is attached to the back of the support main through the adhesive material Liquid crystal display comprising a. The method of claim 1, A projection is formed on the rear surface of the support main, and a hole is formed at an edge of the cover bottom corresponding to the projection. The method of claim 1, A guide groove is formed on a rear surface of the support main, and a guide jaw is formed at an edge of the cover bottom corresponding to the guide groove. The method of claim 1, The support main has a protrusion formed inward, and the liquid crystal panel is attached to the protrusion through an adhesive material. The method of claim 1, And a top cover covering an upper edge of the liquid crystal panel and coupled to the support main. The method of claim 1, The backlight unit may be a side light method including a reflector, a light guide plate positioned on the reflector, a plurality of optical sheets interposed on the light guide plate, and a light source positioned at one side of the light guide plate. The method of claim 1, The backlight unit is a direct light type liquid crystal display device comprising a reflector, a plurality of light sources arranged side by side on the reflecting plate, and a plurality of optical sheets interposed on the light source.

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