KR20080058911A - Liquid crystal display device - Google Patents

Abstract

An LCD(Liquid Crystal Display) is provided to form a reflector such that the reflector envelops the backside of a light guide plate, the outer side of a main support and the side of an LCD panel and comes into contact with the inner side of a bottom cover to protect the LCD panel and reduce the size and weight of the main support. An LCD includes a backlight assembly(104), a main support(105), an LCD panel(108), and a bottom cover(109). The backlight assembly includes a reflector(101) and a light guide plate(102). The main support houses the backlight assembly. The LCD panel is located on the main support and displays images. The bottom cover envelops the main support, the backlight assembly and the LCD panel. The reflector is arranged inside the bottom cover and envelops the rear side of the light guide plate, the outer side of the main support and the side of the LCD panel.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

1 is a perspective view showing a general liquid crystal display device.

2 is a cross-sectional view taken along the line I-I of FIG.

3 is a perspective view showing a liquid crystal display according to a first embodiment of the present invention.

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

5 is a cross-sectional view of the liquid crystal display according to the second exemplary embodiment of the present invention.

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

101, 201: reflector

102, 202: Light guide plate

108, 208: liquid crystal panel

109, 209: lower cover

112, 212: double sided tape

213: guide means

The present invention relates to a liquid crystal display, and more particularly, to a liquid crystal display capable of minimizing the size and weight of the liquid crystal display by changing the shape of the reflector and the main support.

BACKGROUND ART In general, liquid crystal display devices have tended to be gradually widened due to their light weight, thinness, and low power consumption. Accordingly, the liquid crystal display device is widely used as a portable computer such as a notebook PC, office automation equipment, audio / video equipment, indoor and outdoor advertising display devices, and the like.

In the liquid crystal display, the amount of light transmitted is adjusted according to image signals applied to a plurality of control switching elements arranged in a matrix to display a desired image on a screen. Such liquid crystal displays are rapidly developing in size and in high resolution due to recent mass production technology and R & D.

In general, a liquid crystal display includes a liquid crystal panel including a color filter substrate as an upper substrate, a thin film transistor array substrate as a lower substrate, and a liquid crystal layer filled between the substrates; And a driver for supplying a scan signal to the liquid crystal panel and supplying image information to perform an operation of the liquid crystal panel.

Here, the liquid crystal panel includes gate lines that are horizontally spaced apart from each other and data lines that are vertically spaced apart from each other intersect with each other, and pixels are formed in a region where the gate lines and data lines intersect with each other. do. Switching elements are individually provided in the pixels, and are electrically connected to gate lines and data lines.

The thin film transistor array substrate and the color filter substrate include a pixel electrode and a common electrode, and a liquid crystal is driven by a voltage difference between the pixel electrode and the common electrode to display an image.

Since the liquid crystal display does not emit light by the liquid crystal panel itself, a light source such as a lamp is required to visually recognize the display contents. Therefore, the backlight assembly is provided on the rear surface of the liquid crystal display as a light source.

The liquid crystal panel and the backlight assembly must be fastened in an integrated form to prevent light loss and must be protected from damage by external impact. To this end, a case formed in a form surrounding the backlight assembly including the edge of the liquid crystal panel is provided.

A conventional liquid crystal display including the case will be described in detail with reference to FIGS. 1 and 2 as follows.

FIG. 1 is a perspective view illustrating a general liquid crystal display, in which a lower cover is fastened to a main support in which a backlight assembly and a liquid crystal panel are accommodated.

FIG. 2 is a cross-sectional view of the II-II part of FIG. 1 and illustrates a panel guide part provided in the main support.

As shown in Fig. 1 and Fig. 2, a typical liquid crystal display device includes a backlight assembly 4; A liquid crystal panel 8 disposed on the backlight assembly 4; A main support 5 having the backlight assembly 4 and the liquid crystal panel 8 housed therein; The main support 5 and the main support 5 includes a liquid crystal panel 8 and a lower cover 9 which surrounds and protects the backlight assembly 4. Upper and lower polarizers 10 and 11 are attached to upper and lower portions of the liquid crystal panel 8, respectively. Here, FIG. 1 omits the upper polarizer 10 and the lower polarizer 11 for convenience of description, and FIG. 2 illustrates the upper polarizer 10 and the lower polarizer 11.

A double-sided tape 12 is attached between the lower polarizer 11 and the main support 5, which may be a light shielding tape.

As shown in FIG. 2, the backlight assembly 4 includes a lamp (not shown); A light guide plate (2) for converting light incident from the lamp (not shown) into a surface light source and guiding it toward the liquid crystal panel (8); A reflector plate (1) positioned below the light guide plate (2); It comprises a plurality of optical sheets (3) for improving the efficiency of the light emitted from the light guide plate (2) to irradiate the liquid crystal panel (8).

Light emitted from the lamp (not shown) travels toward the liquid crystal panel 8 by the reflecting plate 1 and the light guide plate 2, and is converted into light having a uniform luminance while passing through the optical sheet 3. And enters into the liquid crystal panel 8. Through this, the liquid crystal panel 8 displays an image of high brightness to the outside.

The main support 5 is formed of a mold made of metal or synthetic resin, and a plurality of panel guide portions 5a are formed along an inner side surface of the main support 5. The plurality of panel guide portions 5a protruding toward the liquid crystal panel 8 serve to hold the position of the liquid crystal panel 8 when the liquid crystal panel 8 is accommodated in the main support 5 and assembled. do.

The portion of the main support 5 in which the panel guide 5a is formed has a thickness of W1 as shown in FIG. 2, and the thickness W1 preferably has a length of 1.1 mm or more.

In addition, a portion of the main support 5 in which the panel guide 5a is not formed has a thickness of W2 as shown in FIG. 2, and the thickness W1 preferably has a length of 0.6 mm or more.

As shown in FIG. 2, the liquid crystal panel 8 includes a color filter substrate 6 as an upper substrate and a thin film transistor array substrate 7 as a lower substrate, and an upper polarizing plate on the upper surface of the color filter substrate 6. 10) the lower polarizing plate 11 is located on the rear surface of the thin film transistor array substrate 7.

In addition, the lower cover 9 encloses and holds the main support 5 in which the liquid crystal panel 8 and the backlight assembly 4 are accommodated, and the liquid crystal panel 8 and the backlight assembly 4 as well as the main support 5. Protect.

The liquid crystal display device having the above-described configuration has been actively developed in a thinner and lighter model as the user's expectation for a lighter and thinner model is recently increased.

Lightweight, thinner models are especially required in small models such as mobile phones, digital cameras, and personal digital assistants (PDAs). Recently, in order to reduce the outer size and weight of the liquid crystal display device, the thickness W1 of the portion where the panel guide 5a is formed and the thickness W2 of the portion where the panel guide 5a is not formed are reduced. In order to reduce the size of the liquid crystal display, there is a limitation in minimizing the outer size of the liquid crystal display.

In particular, since the structure of the panel guide 5a formed in the existing main support 5 is configured to guide the liquid crystal panel 8 by applying a rib shape, the main support 5 may be used to reduce the outer size and weight of the liquid crystal display device. It is more difficult to reduce the thickness of).

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a liquid crystal display device by minimizing the outer size and weight of the liquid crystal display device by changing the shape of the reflector and the main support.

According to an aspect of the present invention, there is provided a liquid crystal display device including: a backlight assembly including a reflection plate and a light guide plate; A main support in which the backlight assembly is received; A liquid crystal panel disposed on an upper surface of the main support and displaying an image; A lower cover surrounding the main support, the backlight assembly, and the liquid crystal panel; It is configured to include, wherein the reflector is characterized in that it is disposed inside the lower cover in a form surrounding the outer side of the main support and the side of the liquid crystal panel starting from the back of the light guide plate.

Hereinafter, a liquid crystal display according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, a first embodiment according to the present invention will be described with reference to FIGS. 3 and 4.

3 is a perspective view illustrating a liquid crystal display according to a first exemplary embodiment of the present invention, in which a reflector disposed inside the lower cover surrounds the main support and the liquid crystal panel. 4 is a cross-sectional view taken along the line II-II of FIG. 3.

3 and 4, a liquid crystal display according to a first embodiment of the present invention includes a backlight assembly 104 including a reflector 101 and a light guide plate 102; A main support 105 in which the backlight assembly 104 is received; A liquid crystal panel 108 disposed on an upper surface of the main support 105 to display an image; A lower cover 109 surrounding the main support 105, the backlight assembly 104, and the liquid crystal panel 108; The reflective plate 101 is disposed inside the lower cover 109 in such a manner as to surround the outside of the main support 105 and the side surface of the liquid crystal panel 108, starting from the rear surface of the light guide plate 102.

Here, an upper polarizer 110 and a lower polarizer 111 are provided on the upper and lower portions of the liquid crystal panel 108. In addition, a double-sided tape 112 is attached between the lower polarizer 111 and the upper surface of the main support 105. 3, the upper polarizer 110 and the lower polarizer 111 are omitted for convenience of description, and the upper polarizer 110 and the lower polarizer 111 are illustrated in FIG. 4.

As shown in FIG. 4, the backlight assembly 104 includes a lamp (not shown); A light guide plate 102 for converting light incident from the lamp (not shown) into a surface light source and guiding the light toward the liquid crystal panel 108; A plurality of optical sheets 103 for improving the efficiency of light emitted from the light guide plate 102 and irradiating the liquid crystal panel 108; Starting from the rear surface of the light guide plate 102, the reflector 101 includes an outer side of the main support 105 and a side surface of the liquid crystal panel 108.

Light emitted from the lamp (not shown) travels toward the liquid crystal panel 108 by the reflector 101 and the light guide plate 102, and is converted into light having a uniform luminance while passing through the optical sheet 103. And enters the liquid crystal panel 108. Through this, the liquid crystal panel 108 may display a high brightness image to the outside.

The main support 105 is formed of a mold made of metal or synthetic resin, and houses a backlight assembly 104 therein and a liquid crystal panel 108 is stacked thereon.

In more detail, the optical sheet 103 is stacked on the latching jaw 105b formed in the main support 105, and the upper portion of the double-sided tape 112 attached to the upper surface 105a of the main support 105 is provided. The liquid crystal panel 108 is laminated.

That is, since the reflecting plate 101 is provided to surround the outside of the main support 105 and the side surface of the liquid crystal panel 108 including the rear surface of the light guide plate 102 to protect the liquid crystal panel 108. The main support 105 has only one locking jaw 105b therein to accommodate the optical sheet 103 in the locking jaw 105b, and the liquid crystal panel 108 is not inside the main support 105. It is accommodated in the upper portion of the main support 105.

As described above, in the structure in which the liquid crystal panel 108 is not housed in the main support 105 but stacked on the main support 105, the size of the main support 105 is provided in the conventional liquid crystal display device. It is greatly reduced as compared with the support 105. That is, in the liquid crystal display device in which the liquid crystal panel 108 is stacked on the main support 105, not only the height but also the width of the main support 105 is greatly reduced. Therefore, the liquid crystal display device as described above significantly reduces the overall size and weight of the liquid crystal display device.

A double-sided tape 112 connected to and attached to a portion adjacent to the optical sheet 103 in the upper surface 105a of the main support 105 and a portion adjacent to the main support 105 in the upper surface of the optical sheet 103. Is provided, the liquid crystal panel 108 is located on the upper side of the double-sided tape (112).

Here, the optical sheet 103 is configured to include a diffusion sheet, a prism sheet, and a protective sheet, but for convenience of description, a set thereof is referred to as one optical sheet 103.

The double-sided tape 112 positioned as described above not only serves to prevent the flow of the optical sheet 103 accommodated in the latching jaw 105b of the main support 105, and is provided on the upper portion of the main support 105. It also serves to prevent the flow of the liquid crystal panel 108.

In addition, the double-sided tape 112 may be both an adhesive tape capable of adhering both sides and a light-shielding tape, and the double-sided tape 112 having the function of the light-shielding tape is provided from a lamp (not shown) of the backlight assembly 104. The emitted light serves to prevent light from being incident on the image non-display area that borders the image display area of the liquid crystal panel 108.

That is, the double-sided tape 112 as described above prevents the flow of the optical sheet 103 located on the latching jaw 105b of the main support 105 and the liquid crystal panel 108 located above the main support 105. At the same time it serves to increase the efficiency of the light emitted from the lamp.

The liquid crystal panel 108 includes a color filter substrate 106 as an upper substrate and a thin film transistor array substrate 107 as a lower substrate, and an upper polarizer 110 is disposed on an upper surface of the color filter substrate 106. The lower polarizing plate 111 is positioned on the rear surface of the substrate 107.

As mentioned in the description of the main support 105, the liquid crystal panel 108 is fixed to the upper side of the main support 105 by being attached to the double-sided tape 112 attached to the upper surface 105a of the main support 105. do. In addition, the reflective plate 101 covering the rear surface of the light guide plate 102 and the outside of the main support 105 to protect the liquid crystal panel 108 from external impact and at the same time may be formed of a metal material. The liquid crystal panel 108 is prevented from contacting the lower cover 109.

The color filter substrate 106 of the liquid crystal panel 108 is provided with a common electrode (not shown) including a color filter (not shown) layer and a light blocking layer (not shown). In addition, a thin film transistor array substrate 107 of the liquid crystal panel 108 includes a thin film transistor (not shown) and a pixel electrode (not shown) to drive a liquid crystal by directly applying a voltage to the liquid crystal layer together with the common electrode. .

The common electrode is typically made of a transparent conductive material such as indium tin oxide (ITO), and the common electrode directly applies a voltage to the liquid crystal layer together with the pixel electrode of the thin film transistor array substrate 107.

The pixel electrode is also typically made of a transparent conductive material such as indium tin oxide (ITO), and the pixel electrode is electrically connected to the thin film transistor.

Since the reflective plate 101 is disposed inside the lower cover 109 in such a shape as to surround the side of the liquid crystal panel 108 starting from the rear surface of the light guide plate 102, the common electrode or pixel electrode as described above may be disposed on the reflective plate 101. It is protected from external shocks, and also prevents direct contact with the metal lower cover 109.

The lower cover 109 surrounds the main support 105, the backlight assembly 104, and the liquid crystal panel 108. In addition, the lower cover 109 is typically formed of a metal material.

The lower cover 109 accommodates the main support 105 therein, thereby receiving the backlight assembly 104 provided in the main support 105. In addition, the lower cover 109 accommodates the liquid crystal panel 108 mounted on the upper portion of the main support 105.

As such, the lower cover 109 allows the liquid crystal panel 108, which is a key component of the liquid crystal display device, to be seated on the upper portion of the main support 105 to maintain a fixed shape, and also to provide a key component of the liquid crystal display device. The in backlight assembly 104 is accommodated in the main support 105 to maintain a fixed shape. The lower cover 109 serves to protect the liquid crystal panel 108 and the backlight assembly 104 from external shocks.

 Inside the lower cover 109, a reflecting plate 101 is disposed to abut on an inner surface of the lower cover 109, and the reflecting plate 101 is a portion in which the rear surface of the light guide plate 102 is located in the inner surface of the lower cover 109. Starting from at least to the side of the liquid crystal panel 108 has a form that wraps. Here, the reflective plate 101 may be attached to the inner surface of the lower cover 109 by using an adhesive member.

That is, the reflecting plate 101 is provided inside the lower cover 109, and as shown in FIG. 4, the outer side of the main support 105 and the liquid crystal panel 108 starting from the rear surface of the light guide plate 102. It is arranged to surround the side. In addition, the reflector 101 may be a non-conductive material and have a small frictional force so as not to impact the liquid crystal panel.

As described above, the reflective plate 101 wraps the entire side surface of the liquid crystal panel 108 so that the liquid crystal panel 108 is formed of the metal lower cover 109 when the liquid crystal panel 108 is assembled into the lower cover 109. The liquid crystal panel 108 is prevented from directly contacting the lower cover 109 even after the assembly of the liquid crystal display device is completed.

The reflector 101 serves to enhance the efficiency of light emitted from the lamp by reflecting the light emitted from the lamp (not shown), which is a component of the backlight assembly 104, toward the liquid crystal panel 108.

That is, the reflecting plate 101 reflects the light emitted from the lamp to be incident into the light guide plate 102, whereby the light emitted from the lamp is formed on the back of the light guide plate 102 or the light guide plate 102 and the main support 105. Minimize light loss by preventing escape to gaps formed between them. The light emitted from the lamp and reflected by the reflecting plate 101 and then incident into the light guide plate 102 is converted into high quality light through the light guide plate 102 and the optical sheet 103 and then enters the liquid crystal panel 108. Thus, the screen displayed on the liquid crystal panel 108 is displayed to the user.

As described above, the reflective plate 101 is disposed in the form of surrounding the outside of the main support 105 and the side surface of the liquid crystal panel 108, starting with the rear surface of the light guide plate 102. However, the reflective plate 101 is not disposed to be in contact with the side surface of the liquid crystal panel 108 when the liquid crystal display device is assembled, but is assembled with a side surface and a predetermined gap (Gap) of the liquid crystal panel 108. do. The reason why the side surfaces of the reflective plate 101 and the liquid crystal panel 108 are assembled with a predetermined gap is to prevent the shock applied to the lower cover 109 from being transmitted to the liquid crystal panel 108 from the outside.

That is, the reflective plate 101 and the liquid crystal panel 108 are assembled with a predetermined gap, thereby minimizing the transmission of an impact from the outside to the liquid crystal panel 108, and thus occurring in the liquid crystal panel 108 by an external impact. Minimize defects.

In addition, the reflective plate 101, which is a component of the present invention, is preferably formed of a non-conductive material as mentioned above. That is, when assembling the liquid crystal display device, the reflective plate 101 is assembled with a fine gap between the side surfaces of the liquid crystal panel 108. However, when the impact is applied to the liquid crystal display device from the outside, the reflective plate 101 is formed. Since the liquid crystal panel 108 comes into contact with the side surface of the liquid crystal panel 108, when the reflective plate 101 is formed of a conductive material, static electricity or the like deposited on the reflective plate 101 affects the liquid crystal panel 108. Since the display quality of the device may be degraded, the reflective plate 101 is preferably formed of a non-conductive material.

As described above, the liquid crystal display device to which the reflective plate 101 disposed inside the lower cover 109 is applied to surround the main support 105 and the side surface of the liquid crystal panel 108, starting from the rear surface of the light guide plate 102. Since 101 serves to protect the liquid crystal panel 108, the size of the main support 105 is greatly reduced. That is, in the liquid crystal display device to which the reflection plate 101 is applied as described above, the height and width of the main support 105 are greatly reduced, so that the size and weight of the liquid crystal display device itself are greatly reduced.

Hereinafter, a second embodiment of the present invention will be described with reference to FIG. 5.

In the liquid crystal display according to the second exemplary embodiment of the present invention, since the components except for the reflecting plate and the guide means are the same as those of the first exemplary embodiment, detailed descriptions overlapping with those of the first exemplary embodiment will be omitted.

5 is a cross-sectional view of the liquid crystal display according to the second exemplary embodiment of the present invention.

As shown in FIG. 5, the liquid crystal display according to the second exemplary embodiment of the present invention includes a backlight assembly 204 including a reflecting plate 201 and a light guide plate 202; A main support 205 in which the backlight assembly 204 is received; A liquid crystal panel 208 disposed on an upper surface of the main support 205 to display an image; Guide means 213 connected to the reflective plate 201 and surrounding the side surface of the liquid crystal panel 208; The main support 205 and the backlight assembly 204 and the lower cover 209 surrounding the liquid crystal panel 208 is configured to include.

In addition, an upper polarizer 210 and a lower polarizer 211 are attached to upper and lower portions of the liquid crystal panel 208, and a double-sided tape 212 is disposed between the rear surface of the lower polarizer 211 and the upper surface of the main support 205. Is attached. Here, the double-sided tape 212 may be a light shielding tape.

As shown in FIG. 5, the reflecting plate 201 is positioned on the rear surface of the light guide plate 202, and the guide means 213 extends from an end of the reflecting plate 201 to pass through the main support 205 and pass through the liquid crystal panel. It has a shape extending to the side of 208.

That is, the guide means 213 has a shape that wraps the side of the liquid crystal panel 208 and surrounds the outside of the main support 205.

The guide means 213 is preferably a non-conductive material, which is to prevent the common electrode or the pixel electrode of the liquid crystal panel 208 from directly contacting the lower cover 209 of the metal material.

As illustrated in FIG. 5, the guide means 213 wraps the entire side surface of the liquid crystal panel 208 to assemble the liquid crystal panel 208 into the lower cover 209. Prevents direct contact with the lower cover 209 and prevents the liquid crystal panel 208 from directly contacting the lower cover 209 even after the assembly of the liquid crystal display device is completed.

In the liquid crystal display device provided with the guide means 213 as described above, since the guide means 213 serves to protect the liquid crystal panel 208, the size of the main support 205 is greatly reduced. That is, in the liquid crystal display device to which the guide means 213 as described above is applied, the height and width of the main support 205 are greatly reduced, so that the size and weight of the liquid crystal display device itself are greatly reduced.

As described in detail above, the present invention protects the liquid crystal panel by contacting the inner surface of the lower cover with the reflector formed in the form of surrounding the side of the main support and the side of the liquid crystal panel, starting from the rear surface of the light guide plate, or extending from the reflector to extend the liquid crystal panel. Since the guide means formed in a form surrounding the side protects the liquid crystal panel by contacting the inner surface of the lower cover, there is an effect that can significantly reduce the size and weight of the main support.

Therefore, it is possible to meet the expectation for the development of thinner and lighter models according to the recent trend of light weight and thinness in the liquid crystal display device. In particular, it is more effective when applied to small models such as mobile phones, digital cameras and personal digital assistants (PDAs), which are expected to be light and thin.

Claims (14)

A backlight assembly including a reflector and a light guide plate; A main support in which the backlight assembly is received; A liquid crystal panel disposed on an upper surface of the main support and displaying an image; A lower cover surrounding the main support, the backlight assembly, and the liquid crystal panel; It is configured to include, And the reflection plate is disposed inside the lower cover to surround the outside of the main support and the side of the liquid crystal panel starting from the rear surface of the light guide plate. The liquid crystal display of claim 1, wherein the reflector is formed of a non-conductive material. The liquid crystal display of claim 1, wherein the reflective plate is disposed to contact the inner surface of the lower cover. The liquid crystal display device of claim 3, wherein the reflective plate is arranged to surround the upper surface of the side surface of the liquid crystal panel, starting from the rear surface of the light guide plate. The liquid crystal display of claim 4, wherein the reflector is attached to an inner surface of the lower cover. The liquid crystal display of claim 1, wherein an upper polarizer and a lower polarizer are attached to upper and lower portions of the liquid crystal panel. The liquid crystal display of claim 6, wherein a double-sided tape is attached between the rear surface of the lower polarizer and the upper surface of the main support. 8. The liquid crystal display device according to claim 7, wherein the double-sided tape is a light shielding tape. A backlight assembly including a reflector and a light guide plate; A main support in which the backlight assembly is received; A liquid crystal panel disposed on an upper surface of the main support and displaying an image; Guide means connected to the reflector and surrounding a side surface of the liquid crystal panel; A lower cover surrounding the main support, the backlight assembly, and the liquid crystal panel; Liquid crystal display device comprising a. 10. The liquid crystal display device according to claim 9, wherein the guide means is formed of a non-conductive material. 10. The liquid crystal display device according to claim 9, wherein the guide means surrounds the outside of the main support. The liquid crystal display of claim 9, wherein an upper polarizer and a lower polarizer are attached to upper and lower portions of the liquid crystal panel. The liquid crystal display of claim 12, wherein a double-sided tape is attached between the rear surface of the lower polarizer and the upper surface of the main support. The liquid crystal display of claim 13, wherein the double-sided tape is a light shielding tape.

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