KR102143371B1 - Liquid crystal display device and method for manufacturing of the same - Google Patents

Abstract

A liquid crystal display according to an embodiment of the present invention includes a light guide plate for guiding light, a light source positioned at one side of the light guide plate to provide light, a reflector plate positioned under the light guide plate to reflect light, and the light guide plate and the light source. And a guide panel supporting, the light guide plate, the light source, a bottom cover accommodating the reflective plate and the guide panel, and an adhesive bonding the guide panel to the bottom cover.

Description

Liquid crystal display device and its manufacturing method {LIQUID CRYSTAL DISPLAY DEVICE AND METHOD FOR MANUFACTURING OF THE SAME}

The present invention relates to a liquid crystal display device, and to a liquid crystal display device capable of reducing a bezel and implementing slimming, and a method of manufacturing the same.

Liquid Crystal Display Device (LCD) is widely used due to its advantages such as low power operation, thin structure, and excellent image quality. In such a liquid crystal display, a liquid crystal panel made of two substrates facing each other and a liquid crystal interposed therebetween is used. Then, the liquid crystal panel displays an image by changing the liquid crystal arrangement by an electric field generated through the liquid crystal.

Such a liquid crystal panel is a non-luminous display panel and requires a light supply device such as a back light unit (BLU) to display an image. In general, a liquid crystal display device includes a liquid crystal panel and a backlight unit (BLU). ) Are composed together. These backlight units are classified into an edge type backlight unit (Edge type BLU) and a direct type backlight unit (Bottom Type BLU) according to the location of the light source. In addition, the backlight unit (BLU) includes a light guide plate and various types of optical sheets to efficiently transmit and use light supplied to a light source to a liquid crystal panel.

1 is a cross-sectional view illustrating a bottom cover and a guide panel of a conventional liquid crystal display device. Referring to FIG. 1, a conventional liquid crystal display 10 includes a bottom cover 20 accommodating a backlight unit, and a guide panel 40 attached to the bottom cover 20 with double-sided tape 30. In the guide panel 40, a light guide plate 50 for guiding light, a light source 60 for providing light, and a reflector 70 for reflecting light from under the light guide plate 50 are positioned.

The conventional liquid crystal display 10 uses a double-sided tape 30 as a means for attaching the guide panel 40 to the bottom cover 20. Recently, as the bezel is reduced, the width of the guide panel 40 is becoming thinner, and accordingly, the width of the double-sided tape 30 must be gradually reduced. However, there is a limit to the width of the double-sided tape 30 due to limitations in the current double-sided tape 30 manufacturing technology. Therefore, a new method of bonding the guide panel to the bottom cover is required.

The present invention provides a liquid crystal display device capable of reducing a bezel and implementing slimming, and a method of manufacturing the same.

In order to achieve the above object, a liquid crystal display device according to an embodiment of the present invention includes a light guide plate for guiding light, a light source positioned at one side of the light guide plate to provide light, and a light source positioned under the light guide plate to reflect light. Adhering the guide panel to a reflector, a guide panel supporting the light guide plate and the light source, the light guide plate, the light source, a bottom cover accommodating the reflective plate and the guide panel, a liquid crystal panel positioned on the light guide plate, and the bottom cover It characterized in that it comprises an adhesive.

The adhesive is characterized in that it is located between the guide panel and the side wall of the bottom cover.

The guide panel may further include a protrusion corresponding to a sidewall of the bottom cover.

An injection part into which the adhesive is injected is positioned between the protrusion of the guide panel and the sidewall of the bottom cover.

The injection part may be located at least partially around the guide panel.

In addition, a method of manufacturing a liquid crystal display device according to an embodiment of the present invention comprises the steps of aligning a guide panel to a bottom cover and injecting an adhesive to an injection portion provided between the bottom cover and the guide panel, and pressing the guide panel. And bonding to the bottom cover, forming a reflective plate in the guide panel, forming a light guide plate and a light source on the reflecting plate, and forming a liquid crystal panel on the light guide plate.

After injecting the adhesive, it characterized in that it further comprises the step of curing the adhesive by irradiating heat or UV.

In the liquid crystal display device according to the exemplary embodiment of the present invention, the guide panel and the bottom cover are easily provided even when the width of the guide panel is reduced by forming a protrusion on the guide panel and arranging it at a predetermined distance from the bottom cover so that the adhesive can be injected. There is an advantage of being able to bond properly. In addition, since the double-sided tape for bonding the conventional guide panel and the bottom cover can be omitted, there is an advantage in that the liquid crystal display can be made slim.

1 is a cross-sectional view showing a bottom cover and a guide panel of a conventional liquid crystal display device.
2 is an exploded perspective view showing a liquid crystal display device according to an embodiment of the present invention.
3 is a cross-sectional view taken along line II′ of FIG. 2.
4 is an enlarged view of an area A of FIG.
5 is a side view of the liquid crystal display of FIG. 3 viewed from a direction B;
6 is a side view of a liquid crystal display according to another embodiment.
7 is a view showing a method of manufacturing a liquid crystal display device according to an embodiment of the present invention.
8A and 8B are photographs showing a liquid crystal display device manufactured through the method of manufacturing a liquid crystal display device of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals throughout the specification mean substantially the same elements. In the following description, when it is determined that a detailed description of known content or configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

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

Referring to FIG. 2, a liquid crystal display device 100 according to an embodiment of the present invention includes a liquid crystal panel 110, a backlight unit 130, a guide panel 140, a bottom cover 150, and a top cover 160. Consists of including.

The liquid crystal panel 110 is mounted on a panel support portion of the guide panel 140 to adjust the transmittance of light supplied from the backlight unit 130 to implement an image. The liquid crystal panel 110 includes a first substrate 111 and a second substrate 112 bonded to each other with a tongue facing each other with a liquid crystal layer (not shown) therebetween. Although not shown in the drawing, a plurality of pixels may be defined by crossing a plurality of scan lines and data lines in a matrix shape on a first substrate 111 called a TFT array substrate. Each pixel may be provided with a thin film transistor (TFT) capable of turning on/off a signal, and a pixel electrode connected to each of the thin film transistors may be positioned.

In addition, the second substrate 112 called a color filter substrate includes red (R), green (G), and blue (B) color filters respectively corresponding to a plurality of pixels, and scan lines, data lines, and thin films surrounding them. A black matrix may be provided to cover non-display devices such as transistors. In addition, a transparent common electrode covering them may be provided. In this embodiment, a pixel electrode is provided on the first substrate and a common electrode is provided on the second substrate as an example, but the present invention is not limited thereto, and both the pixel electrode and the common electrode may be provided on the first substrate. In addition, a printed circuit board 116 is connected to at least one side of the liquid crystal panel 110 through a connection member 114 such as a flexible circuit board or a tape carrier package (TCP), so that a guide panel ( It may be disposed in close contact with the side surface of 140) or the rear surface of the bottom cover 150.

In the liquid crystal panel 110 having the above structure, when the thin film transistor selected for each scan line is turned on by the on/off signal of the gate driving circuit transmitted from the scan line, the data voltage of the data driving circuit is transmitted through the data line. It is transmitted to the corresponding pixel electrode, and accordingly, an arrangement direction of liquid crystal molecules is changed by an electric field between the pixel electrode and the common electrode, thereby indicating a difference in transmittance.

The guide panel 140 wraps the edges of the light guide plate 125, the optical sheet 139, and the reflective plate 128, and attaches the light guide plate 125, the optical sheet 139, and the reflective plate 128 to the bottom cover 150. It plays a role of fixing and supporting the liquid crystal panel 110.

Meanwhile, the liquid crystal display device 100 of the present invention may be provided with a backlight unit 130 capable of providing light to the liquid crystal panel 110 from the rear surface of the liquid crystal panel 110. The backlight unit 130 includes a light source 120, a white or silver reflecting plate 128, a light guide plate 125 positioned on the reflecting plate 128, and a plurality of optical sheets 139 interposed on the light guide plate 125 It may include.

The light source 120 is mounted on a light source circuit board, driven by a power source, and generates light. The light source 120 may be formed of any one of a Light Emitting Diode (LED), a Cold Cathode Flourescent Lamp (CCFL), and an External Electrode Fluorescent Lamp (EEFL). Light emitted from the light source 120 is incident into the light guide plate 125 and is supplied to the liquid crystal panel 110 by the light guide plate 125, the optical sheet 139, and the reflecting plate 128. The light source 120 is formed to face at least one surface of the light guide plate 125. In this embodiment, when the LED is described as an example of the light source 120, the LED assembly is located on one side of the light guide plate 125, and a plurality of LED light sources 121 and the LED light sources 121 are mounted at predetermined intervals. It is configured to include an LED flexible circuit board 122.

Meanwhile, in the present invention, it is advantageous that the backlight unit 130 is configured in an edge type. The light guide plate of the present invention induces total reflection of light emitted from the light source 120 by not only the upper pattern and the light collecting sheet, but also the lower pattern, thereby improving luminance and preventing hot spots or bright lines from occurring.

The optical sheet 139 condenses or diffuses the light emitted through the light guide plate 125 to be transmitted to the liquid crystal panel 110. To this end, the optical sheet 139 is configured to include at least one diffusion sheet or a light collecting sheet. The diffusion sheet prevents the light emitted through the light guide plate 125 from being concentrated in a partial area, and distributes the light so that it is transmitted to the liquid crystal panel 110 in an even distribution. The light collecting sheet collects light emitted from the light guide plate 125 and allows the light to be transmitted vertically to the liquid crystal panel 110. In particular, the light collecting sheet of the present invention may be composed of a reverse prism sheet in which a sheet pattern is formed on a surface facing the light guide plate 125.

The reflective plate 128 is disposed below or on the side of the light guide plate 125 and reflects light emitted to the exit or lower portion of the light guide plate 125 into the light guide plate 125. The formation position of the reflector 128 may vary depending on the arrangement of the light source 120. For example, in the case of an edge type backlight unit, as shown in FIG. 2, it may be disposed under the light guide plate 125, that is, on a surface facing the liquid crystal panel 110 with the light guide plate 125 therebetween. Further, in the case of the direct type backlight unit, it may be configured on the side of the light guide plate 125 or omitted as necessary, and is not limited only to what is presented, and may be modified according to various tolerances such as the arrangement of the light source 120. The light guide plate 125 serves to provide a primary surface light source to the liquid crystal panel 110 by spreading to a wide area of the light guide plate 125 while the light incident from the light source 120 travels through the light guide plate 125 by several total reflections. can do. The light guide plate 125 may include a pattern having a specific shape on its rear surface to supply a uniform surface light source.

The liquid crystal panel 110 and the backlight unit 130 may be modularized through the top cover 160, the guide panel 140, and the bottom cover 150. The top cover 160 has a shape of a rectangular frame that covers the top and side surfaces of the liquid crystal panel 110, and opens the front of the top cover 160 to display an image implemented in the liquid crystal panel 110. The bottom cover 150 serves as a basis for a liquid crystal display by combining the liquid crystal panel 110 and the backlight unit 130, and may be formed in a single plate shape having a square shape.

Hereinafter, a configuration in which the above-described bottom cover and the guide panel are bonded will be described in more detail with reference to the following drawings.

FIG. 3 is a cross-sectional view taken along line II′ of FIG. 2, FIG. 4 is an enlarged view of area A of FIG. 3, and FIG. 5 is a side view of the liquid crystal display of FIG. 3 viewed from direction B, and FIG. 6 is a side view of a liquid crystal display according to another embodiment.

3 and 4, in the liquid crystal display device 100 of the present invention, a reflector 128, a light guide plate 125, a light source 120, and a guide panel 140 are accommodated in the bottom cover 150. In particular, the guide panel 140 is bonded to the bottom cover 150 through an adhesive 145 in order to be fixed in the bottom cover 150. As the adhesive 145, glue, acrylic resin, epoxy resin, or the like may be used, and any adhesive material may be used as long as it has adhesive properties.

The guide panel 140 of the present invention has a protruding portion 142 that partially protrudes. For example, the cross section of the guide panel 140 may be formed in a "L" shape. Here, the protrusion 142 of the guide panel 140 protrudes above the side wall 152 of the bottom cover 150 and is positioned to be spaced apart from the side wall 152 of the bottom cover 150 by a predetermined interval. The portion where the protrusion 142 of the guide panel 140 and the sidewall 152 of the bottom cover 150 are spaced apart serves as an injection part 147 into which the adhesive 145 is injected. The distance between the protrusion 142 of the guide panel 140 and the sidewall 152 of the bottom cover 150 is spaced apart, that is, the size d1 of the injection part 147 is at least 0.2 mm or more. When the size d1 of the injection unit 147 is at least 0.2 mm or more, the adhesive 145 can be easily injected using an injection device for injection of the adhesive 145.

In addition, the guide panel 140 is positioned to be spaced apart from the side wall 152 of the bottom cover 150 by a predetermined interval in the horizontal direction. The portion where the sidewall 152 of the guide panel 140 and the bottom cover 150 is spaced apart is filled with an adhesive 145 to serve as a region to which the guide panel 140 and the bottom cover 150 are bonded. The distance d2 between the guide panel 140 and the sidewall 152 of the bottom cover 150 is at least 0.3 mm or more. The distance d2 between the guide panel 140 and the sidewall 152 of the bottom cover 150 is substantially adjusted to the amount of the adhesive 145 bonding the guide panel 140 and the bottom cover 150 to each other. . That is, if the distance d2 between the side walls 152 of the guide panel 140 and the bottom cover 150 is narrow, the amount of the adhesive 145 is reduced, and the When the distance d2 between the side walls 152 is wide, the amount of the adhesive 145 is also large. Accordingly, in the present invention, the minimum amount of adhesive 145 that can reliably adhere the guide panel 140 and the bottom cover 150 is adjusted, and the side walls of the guide panel 140 and the bottom cover 150 ( The distance d2 separated by 152) is made of at least 0.3mm or more.

Meanwhile, referring to FIG. 5, a gap between the protruding portion 142 of the guide panel 140 and the sidewall 152 of the bottom cover 150 is formed of an injection portion 147. In this case, the injection part 147 may be provided on all sidewalls of the bottom cover 150. That is, when the protrusions 142 are provided on all outer surfaces of the guide panel 140, the sidewall 152 of the bottom cover 150 and the protrusion 142 of the guide panel 140 may be spaced apart in all areas. Accordingly, the injection unit 147 may be positioned anywhere on the outer surface of the guide panel 140 or the bottom cover 150.

On the other hand, referring to FIG. 6, as another example of the present invention, the protrusion 142 of the guide panel 140 and the sidewall 152 of the bottom cover 150 may be partially spaced apart. That is, the protrusion 142 of the guide panel 140 and the sidewall 152 of the bottom cover 150 contact each other in most areas, but may be spaced apart from only a part. Accordingly, the injection part 147 may be located only on a part of the outer surface of the guide panel 140 or the bottom cover 150.

As described above, in the liquid crystal display device according to the exemplary embodiment of the present invention, a protrusion is formed on the guide panel, but the bottom cover is spaced apart from the bottom cover so that the adhesive can be injected, so that even when the width of the guide panel is reduced, There is an advantage that the bottom cover can be easily bonded. In addition, since the double-sided tape for bonding the conventional guide panel and the bottom cover can be omitted, there is an advantage in that the liquid crystal display can be made slim.

Hereinafter, a method of manufacturing a liquid crystal display device according to an embodiment of the present invention will be described. In the following, the process of bonding the bottom cover and the guide panel will be described in detail.

7 is a diagram illustrating a method of manufacturing a liquid crystal display device according to an exemplary embodiment of the present invention.

Referring to FIG. 7, the bottom cover 150 is mounted on the jig 180. The jig 180 serves to support and fix the bottom cover 150 and prevents the bottom cover 150 from moving during the bonding process with the guide panel 140. When the bottom cover 150 is mounted on the jig 180, the guide panel 140 is aligned on the bottom cover 150. In the alignment process of the guide panel 140, the guide panel 140 is aligned in an area where the guide panel 140 is finally positioned.

Subsequently, the guide panel 140 is pressed using a pressing device 190 from the upper part of the guide panel 140 and fixed so that it cannot be moved. The fixing process of the guide panel 140 prevents the guide panel 140 from moving when the adhesive is injected, thereby imparting reliability to the bonding process between the guide panel 140 and the bottom cover 150. Next, the adhesive 145 is injected into the injection hole 147 between the guide panel 140 and the bottom cover 150 using the adhesive injection device 200. The adhesive injection device 200 may be any known device as long as it is a device capable of injecting an adhesive. The adhesive injection device 200 injects a predetermined amount of the adhesive 145 into the injection hole 147 where the guide panel 140 and the bottom cover 150 are spaced apart. At this time, the area between the guide panel 140 and the bottom cover 150 is injected as much as the adhesive 145 can fill. In the adhesive injection process, all of the adhesive 145 may be injected by aligning the adhesive injection device 200 to any one injection port 147, or the adhesive may be simultaneously or sequentially injected into at least two injection ports 147. The adhesive injection process can be injected by any method as long as the adhesive 145 is all filled between the bottom cover 150 and the guide panel 140.

Finally, when the injection of the adhesive 145 is completed, the adhesive 145 is completely cured by irradiating the adhesive 145 with ultraviolet (UV) rays, heat treatment, or leaving it in the air. Accordingly, the bonding process between the bottom cover 150 and the guide panel 140 is completed. In addition, a reflection plate, a light guide plate, a light source, an optical sheet, and the like are mounted in the guide panel 140, and a liquid crystal panel is also mounted to manufacture the liquid crystal display device of the present invention.

8A and 8B are photographs showing a liquid crystal display device manufactured through the method of manufacturing the liquid crystal display device of the present invention. A drop test was performed on the liquid crystal display device thus manufactured, and the results are shown in Table 1 below. Drop test conditions were dropped at 1m away from the ground, but the number of drops was performed twice. If there was no separation of the guide panel and bottom cover after dropping, it was marked as OK.

# 1st test 2nd test One OK 2 OK OK 3 OK OK 4 OK OK 5 OK OK 6 OK OK 7 OK OK 8 OK OK 9 OK OK 10 OK OK 11 OK OK 12 OK OK 13 OK OK 14 OK OK 15 OK OK 16 OK OK 17 OK OK 18 OK OK 19 OK OK 20 OK OK

Referring to Table 1, as a result of a drop test of the liquid crystal display device manufactured according to the present invention, a phenomenon in which the guide panel and the bottom cover are not separated did not occur even once. Therefore, it was possible to confirm the reliability of adhesion between the guide panel and the bottom cover.

As described above, in the liquid crystal display device according to the exemplary embodiment of the present invention, a protrusion is formed on the guide panel, but the bottom cover is spaced apart from the bottom cover so that the adhesive can be injected. There is an advantage that the bottom cover can be easily bonded. In addition, since the double-sided tape for bonding the conventional guide panel and the bottom cover can be omitted, there is an advantage in that the liquid crystal display can be made slim.

It will be appreciated by those skilled in the art through the above description that various changes and modifications can be made without departing from the spirit of the present invention. Therefore, the present invention should not be limited to the content described in the detailed description, but should be defined by the claims.

100: liquid crystal display device 110: liquid crystal panel
120: light source 130: backlight unit
140: guide panel 145: adhesive
150: bottom cover 160: top cover

Claims (7)

A light guide plate to guide light;
A light source positioned on one side of the light guide plate to provide light;
A reflective plate positioned under the light guide plate to reflect light;
A guide panel supporting the light guide plate and the light source;
A bottom cover accommodating the light guide plate, the light source, the reflector, and the guide panel;
A liquid crystal panel positioned on the light guide plate; And
Including an adhesive for bonding the guide panel to the bottom cover,
The adhesive is located between the guide panel and the sidewall of the bottom cover,
The guide panel includes a protrusion corresponding to a sidewall of the bottom cover,
An injection part into which the adhesive is injected is formed between the protrusion of the guide panel and the sidewall of the bottom cover,
The injection part is formed in an opening shape only in a part around the guide panel,
The liquid crystal display device, wherein the guide panel does not cover the light guide plate and the light source. delete delete delete delete delete delete

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