KR20110020614A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: A liquid crystal display is provided to reduce the volume of a backlight unit and an assembly time in a modularization process of the liquid crystal display. CONSTITUTION: A backlight unit which is located in the lower part of a liquid crystal display includes a light source and an optical sheet. A supporter main(200) includes a horizontal plane covering the rear side of the backlight unit and a liquid crystal panel. A top cover is combined with the supporter main. The supporter main is formed in a super reflection resin.

Description

Liquid crystal display device

The present invention relates to a liquid crystal display device, and more particularly, to a light weight liquid crystal display device.

Liquid crystal display devices (LCDs), which are used for TVs and monitors due to their high contrast ratio and are advantageous for displaying moving images, are characterized by optical anisotropy and polarization of liquid crystals. The principle of image implementation by

Such a liquid crystal display is an essential component of a liquid crystal panel bonded through a liquid crystal layer between two side-by-side substrates, and realizes a difference in transmittance by changing an arrangement direction of liquid crystal molecules with an electric field in the liquid crystal panel. do.

On the other hand, the liquid crystal panel requires a separate light source to display the difference in transmittance as an image because it does not have a self-luminous element, and for this purpose, a backlight including a light source is disposed on the back of the liquid crystal panel.

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

As illustrated, a general liquid crystal display module includes a liquid crystal panel 10, a backlight unit 20, a supporter 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 boards 17 are connected to each other along the two adjacent edges of the liquid crystal panel 10 through the connecting member 16.

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

The backlight unit 20 includes a lamp 24 arranged along one longitudinal edge of the supporter main 30, a white or silver reflector 22 seated on the cover bottom 50, and the reflector 22. A light guide plate 26 seated thereon and a plurality of optical sheets 28 interposed thereon are included.

At this time, the lamp guide 25 for guiding the lamp 24 is further provided.

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 the back of the backlight unit 20 in a state where the edges are surrounded by the supporter main 30 having a rectangular frame shape. Cover bottoms 50 covering each of the front and rear are combined and integrated.

That is, the top cover 40 is coupled to the supporter main 30, and the supporter main 30 is coupled to the cover bottom 50 so that the liquid crystal display device is modularized.

However, such a liquid crystal display module modularization process is too complicated to have a low efficiency of the process.

That is, since the cover bottom 50 and the support main main 30 are assembled, the top cover 40 needs to be combined with the support main main 30, thus unnecessarily consuming much time and effort in the modularization process of the liquid crystal display. .

In particular, in recent years, the liquid crystal display device has been gradually expanding its use area such as portable computers, desktop computer monitors and wall-mounted televisions, and has been actively researched to have a significantly reduced weight and volume while having a large display area. It is becoming.

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

In order to achieve the above object, the present invention has a first object of reducing the assembly time and material cost in the modular process of the liquid crystal display device.

Another object of the present invention is to provide a lightweight liquid crystal display device.

The present invention is to solve the above problems, the liquid crystal panel; A backlight unit positioned below the liquid crystal panel and including a plurality of optical sheets and a light source; A supporter main including a horizontal surface covering a rear surface of the backlight unit, and first to fourth edge portions covering edges of the liquid crystal panel and the backlight unit; A liquid crystal display device includes a top cover that covers a front edge of the liquid crystal panel and is coupled to the supporter main.

In this case, the supporter main may be formed of a mold made of super reflection resin, and at least two edge portions of the first to fourth edge portions facing each other may face each other in a direction facing each other. A panel seating jaw supporting a part protrudes.

The backlight unit may be a side light method including a light guide plate positioned on a horizontal surface of the supporter main, a plurality of optical sheets interposed on the light guide plate, and a light source positioned at one side of the light guide plate. Is a direct light method comprising a plurality of light sources arranged side by side on the horizontal plane of the supporter main and a plurality of optical sheets interposed on the light source.

As described above, in accordance with the present invention, the supporter main is configured to have the horizontal plane on which the backlight unit including the liquid crystal panel is seated and the first to fourth edge portions whose edges are bent, and thus the supporter main is inherent in the existing cover bottom. By substituting all of the roles, the cover bottom can be deleted to shorten the assembly time during the modularization of the LCD.

In addition, due to the elimination of the cover bottom composed of a metal material, there is an effect that can provide a lightweight liquid crystal display device, it is also possible to reduce the process cost.

In addition, by forming the supporter main with a super reflection resin, the reflection plate can be eliminated, thereby reducing the volume of the backlight unit occupying the largest volume in the liquid crystal display device, thereby providing a lighter liquid crystal display device. It can work. In addition, there is an effect that can reduce the process cost.

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

2 is an exploded perspective view of 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 top cover 140, and a supporter main 200.

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

In this case, under the premise of an active matrix method, although a plurality of gate lines and data lines are intersected on the inner surface of the first substrate 112, which is commonly referred to as a lower substrate or an array substrate, pixels are defined. Thin film transistors (TFTs) are provided at each intersection to be connected one-to-one with the transparent pixel electrodes formed in each pixel.

In addition, the inner surface of the second substrate 114 called the upper substrate or the color filter substrate may correspond to each pixel, for example, a color filter of red (R), green (G), and blue (B) color, and each of them. A black matrix covering the non-display elements such as gate lines, data lines, and thin film transistors is provided. In addition, a transparent common electrode covering them is provided.

The printed circuit board 117 is connected to at least one edge of the liquid crystal panel 110 via a connection member 116 such as a flexible circuit board, and is folded and adhered to the side or the back of the supporter main 200 during the modularization process. .

Although not clearly shown in the drawings, upper and lower alignment layers (not shown) for determining the initial molecular alignment direction of the liquid crystal are interposed between the two substrates 112 and 114 of the liquid crystal panel 110 and the liquid crystal layer. In order to prevent leakage of the liquid crystal layer filled therebetween, a seal pattern is formed along edges of both substrates 112 and 114.

In this case, polarizers (not shown) are attached to outer surfaces of the first and second substrates 112 and 114, respectively.

A backlight unit 120 for supplying light is provided on a rear surface of the liquid crystal panel 110 such that a difference in transmittance of the liquid crystal panel 110 is expressed to the outside.

The backlight unit 120 includes a lamp 124 and a light guide plate 126 arranged along the length direction of at least one edge of the supporter main 200, 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.

Further, a lamp guide 125 for guiding the lamp 124 is further provided. The lamp guide 125 surrounds the upper and lower sides of the lamp 124 and the outside of the lamp 124 in an open state toward the light guide plate 126. ) And the light 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 in the light guide plate 126 by several total reflections, thereby providing 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.

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 supporter main 200. It is also possible to arrange them side by side along the inner longitudinal direction of both edges of the main 200 facing each other.

The liquid crystal panel 110 and the backlight unit 120 are modularized through the top cover 140 and the supporter main 200.

The top cover 140 has a rectangular frame having a cross section bent in a shape of “a” so as to cover the top and side edges of the liquid crystal panel 110. The top cover 140 opens the front of the top cover 140 to be implemented in the liquid crystal panel 110. It is configured to display an image to be displayed.

In addition, the supporter main 200 of the present invention is configured by vertically bending four edges thereof in a single plate shape having a square shape on which the liquid crystal panel 110 and the backlight unit 120 are seated.

Therefore, the supporter main 200 surrounds the rear surface of the backlight unit 120 and surrounds the edges of the liquid crystal panel 110 and the backlight unit 120.

Accordingly, the supporter main 200 provides a modular liquid crystal display by integrating the liquid crystal panel 110 and the backlight unit 120 together with the top cover 140.

Therefore, the present invention prevents the liquid crystal panel 110 from being detached around the top and side surfaces of the four edges of the liquid crystal panel 110 through the top cover 140, and the liquid crystal panel 110 through the supporter main 200. It is possible to prevent the detachment of the backlight unit 120 while covering the edge of the backlight unit 120.

That is, the supporter main 200 of the present invention replaces all of the supporter main 200 including the unique role of the existing cover bottom (50 of FIG. 1) in addition to its own unique role.

Through this, the present invention enables 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.

In particular, even if the reflective plate (22 of FIG. 1) of the backlight unit 120 is deleted, the luminance of the light may be improved by reflecting the light passing through the rear surface of the light guide plate 126 toward the liquid crystal panel 110.

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 supporter main 200 may be referred to as a guide panel or a main support or a mold frame.

3 is a schematic view showing the appearance of the supporter main according to the embodiment of the present invention.

As shown, the supporter main 200 of the present invention provides a horizontal surface 201 on which the backlight unit (120 of FIG. 2), including the liquid crystal panel (110 of FIG. 2), is mounted to support the entire liquid crystal display device. At the same time, it serves as a subframe that minimizes light loss.

In more detail, the supporter main 200 has a rectangular plate shape having four edges vertically bent edges 203a, 203b, 203c, and 203d, and is closely attached to the back of the backlight unit 120 of FIG. The horizontal surface 201 and its edges are vertically bent upwardly to the first to fourth edge portions 203a, 203b, 203c, and 203d that surround the edge of the backlight unit (120 in FIG. 2) and the liquid crystal panel (110 in FIG. 2). Is done.

In this case, inside the first and second edge portions 203a and 203b, a panel seating jaw 205 protruding a predetermined width in a direction facing each other is configured, and the panel seating jaw 205 is a liquid crystal panel (see FIG. 2). It serves to define the location space of the 110 and the backlight unit (120 of FIG. 2).

That is, the upper portion of the panel seating jaw 205 is located in the liquid crystal panel (110 of FIG. 2), but a part of the rear surface of both sides of the liquid crystal panel (110 of FIG. 2) is seated and supported by the panel seating jaw 205, the position thereof Is fixed, and a backlight unit (120 of FIG. 2) is positioned under the panel seating jaw 205.

Therefore, the heights of the first to fourth edge portions 203a, 203b, 203c, and 203d of the supporter main 200 correspond to the thickness of the liquid crystal panel (110 in FIG. 2) and the thickness of the backlight unit (120 in FIG. 2). It is preferable to comprise so that it may have a height.

As described above, the first to fourth portions of the supporter main 200 are supported while supporting the entire liquid crystal display device through the horizontal plane 201 of the supporter main 200 and minimizing light loss. The edges 203a, 203b, 203c, and 203d surround the edges of the liquid crystal panel 110 (see FIG. 2) and the backlight unit 120 (FIG. 2).

Therefore, the liquid crystal display of the present invention replaces all of the original roles of the existing cover bottom (50 in FIG. 1) through the supporter main 200, thereby eliminating the cover bottom (50 in FIG. 1). Assembly time can be shortened in the modularization process.

In addition, due to the elimination of the cover bottom (50 of FIG. 1) made of a metal material, it is possible to provide a lightweight liquid crystal display device, it is also possible to reduce the process cost.

On the other hand, the supporter main 200 of the present invention is formed through injection molding as a mold of the synthetic resin, wherein, the synthetic resin forming the supporter main 200 is characterized by consisting of a high reflection resin (super reflection resin).

High reflective resins have a very high reflectance of whiteness, and high reflective resins also have good dimensional stability, moldability and high flame retardant and UV resistance.

Therefore, when the supporter main 200 is formed through the high reflection resin, the supporter main 200 has good dimensional stability and moldability and high heat resistance and durability against ultraviolet rays.

In particular, by having a high reflectance, the light passing through the back surface of the light guide plate 126 of FIG. 2 is reflected toward the liquid crystal panel (110 of FIG. 2) through the horizontal plane 201 of the supporter main 200 to improve the brightness of the light. You can.

Therefore, in the liquid crystal display of the present invention, the reflective plate (22 of FIG. 1) disposed on the rear surface of the existing light guide plate 126 of FIG.

As such, by removing the reflector plate 22 of FIG. 1, the volume of the backlight unit 120 of FIG. 2 that occupies the largest volume in the liquid crystal display device can be reduced, thereby providing a lighter liquid crystal display device. .

In addition, the process cost can be reduced.

In particular, it is possible to provide a liquid crystal display device that realizes a more uniform surface light source by preventing the luminance unevenness caused by the conventional reflector (22 of FIG. 1).

Looking at this in more detail, the reflecting plate (22 of FIG. 1) located on the back of the conventional light guide plate (126 of FIG. 2) may be generated by the heat generated when driving the liquid crystal display, the reflecting plate (FIG. 1 22) occurs, the luminance difference occurs in the region where the recesses of the reflecting plate (22 of FIG. 1) are generated, the display region overlapped therewith, and the display region where the recesses are not generated, do. Due to this luminance difference, spots appear on the LCD screen.

However, according to the present invention, since the supporter main 200 is formed to have a high reflectance, the reflecting plate (22 of FIG. 1), which has been separately provided, may be deleted to prevent the occurrence of such a problem.

Alternatively, in addition to forming the supporter main 200 as a high reflection resin, the supporter main 200 may be formed through a general synthetic resin, and then formed inside the horizontal plane 201 in contact with the light guide plate 126 of FIG. 2 and the first to fourth edge portions 203a, It is also possible to coat the inside of 203b, 203c, and 203d with a glossing layer (not shown).

Here, the gloss treatment layer (not shown) may be made of silver (Ag) or aluminum oxide (Al ₂ O ₃ ) having high reflectance.

4 is a partial cross-sectional view of the liquid crystal display of FIG.

As illustrated, the light guide plate 126 is seated on the horizontal surface 201 of the supporter main 200, and the lamp 124 and the light guide plate guided by the lamp guide 125 on one side of the light guide plate 126. A plurality of optical sheets 128 are stacked on top of each other to form the backlight unit 120.

In addition, the liquid crystal panel 110 including the liquid crystal layer (not shown) is disposed between the first and second substrates 112 and 114 and the backlight unit 120 and the upper portion thereof.

In this case, the backlight unit 120 and the liquid crystal panel 110 are surrounded by the supporter mains 200, and the liquid crystal panel 110 protrudes into the edge portion 203a of the supporter mains 200. Supported by the 205, the backlight unit 120 is positioned below the panel mounting jaw 205.

In addition, the top cover 140 covering the upper edge and the side of the liquid crystal panel 110 is integrated with the supporter main 200 to be integrated.

Here, reference numerals 119a and 119b are polarizing plates that selectively transmit only specific light to the outer surfaces of the first second substrates 112 and 114 of the liquid crystal panel 110.

As described above, the supporter main 200 includes a horizontal plane 201 on which the backlight unit (120 of FIG. 2) including the liquid crystal panel (110 of FIG. 2) is seated and first to fourth edge portions of which the edges thereof are bent. By configuring 203a, 203b, 203c, and 203d of FIG. 3, the liquid crystal display of the present invention can replace all of the original roles of the existing cover bottom (50 in FIG. 1) through the supporter main 200. .

As a result, assembling time may be reduced in the modularization process of the liquid crystal display by deleting the cover bottom (50 in FIG. 1).

In addition, due to the elimination of the cover bottom (50 of FIG. 1) made of a metal material, it is possible to provide a lightweight liquid crystal display device, it is also possible to reduce the process cost.

In addition, by forming the supporter main 200 as a super reflection resin, the reflection plate (22 in FIG. 1) disposed on the rear surface of the existing light guide plate 126 of FIG. 2 may be deleted.

As such, by removing the reflector plate 22 of FIG. 1, the volume of the backlight unit 120 of FIG. 2 that occupies the largest volume in the liquid crystal display device can be reduced, thereby providing a lighter liquid crystal display device. .

In addition, the process cost can be reduced.

In particular, it is possible to provide a liquid crystal display device that realizes a more uniform surface light source by preventing the luminance unevenness caused by the conventional reflector (22 of FIG. 1).

In this case, the backlight unit 120 having the above-described structure is generally referred to as a side light method. According to the purpose, the backlight unit 120 directly arranges a plurality of lamps 124 side by side on the upper surface of the horizontal surface 201 of the supporter main 200. A light method may be used, and in the case of the direct light method, the light guide plate 126 may be omitted.

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 of a liquid crystal display according to an exemplary embodiment of the present invention.

Figure 3 is a perspective view schematically showing the appearance of the supporter main in accordance with an embodiment of the present invention.

4 is a partial cross-sectional view of the liquid crystal display of FIG.

Claims (5)

A liquid crystal panel; A backlight unit positioned below the liquid crystal panel and including a plurality of optical sheets and a light source; A supporter main including a horizontal surface covering a rear surface of the backlight unit, and first to fourth edge portions covering edges of the liquid crystal panel and the backlight unit; The top cover which covers the front edge of the liquid crystal panel and is combined with the supporter main Liquid crystal display comprising a. The method of claim 1, The supporter main is a liquid crystal display device formed of a mold of super reflection resin. The method of claim 1, And a panel seating jaw for supporting a portion of the rear surface of the liquid crystal panel in a direction facing each other inside at least two edge portions facing each other among the first to fourth edge portions. The method of claim 1, The backlight unit is a liquid crystal display device comprising a light guide plate positioned on a horizontal surface of the supporter main, 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 plurality of light sources arranged side by side on the horizontal plane of the supporter main and a plurality of optical sheets interposed thereon.

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