KR102224095B1 - Backlight assembly and liquid crystal display device having the same - Google Patents

Abstract

The present invention discloses a backlight assembly and a liquid crystal display device including the same. The disclosed backlight assembly and a liquid crystal display device including the same include an optical sheet disposed on a rear surface of a display panel, and include a light guide plate disposed on a rear surface of the optical sheet. In addition, a PCB substrate including a first PCB substrate disposed on a side surface of the light guide plate and a second PCB substrate extending perpendicularly to the first PCB substrate and disposed under the light guide plate, and a rear surface of the second PCB substrate It is disposed on and includes a cover bottom containing photo paper.

Description

Backlight assembly and liquid crystal display device having the same

The present invention relates to a backlight assembly and a liquid crystal display device having the same, and more specifically, a backlight assembly capable of reducing weight and slimming, and improving the aesthetics of the rear surface of the liquid crystal display device, and a liquid crystal display including the same It relates to the device.

As the information society develops, the demand for video display devices is increasing in various forms, and in recent years, liquid crystal displays, field emission displays, plasma display panels, and Various flat panel displays such as light emitting displays are being used.

In general, among flat panel displays, liquid crystal displays are widely used because they can drive low power and have excellent image quality. In the liquid crystal display, a liquid crystal panel composed of two substrates facing each other and a liquid crystal interposed therebetween is used. Here, the liquid crystal display panel displays an image by changing the liquid crystal arrangement by an electric field generated through the liquid crystal.

Such a liquid crystal display panel corresponds to a non-emission type liquid crystal panel and displays an image by receiving light from a backlight unit. A liquid crystal display device is a non-light-emitting device and requires a light source to visually represent an image. In this case, the backlight assembly serves as the light source.

Such a backlight assembly includes a guide panel accommodating a liquid crystal display panel, an optical sheet that increases light efficiency, a lamp or LED chip used as a light source, and a light guide plate that uniformly distributes light transmitted from the light source to the liquid crystal display panel. It is equipped with.

The PCB board included in the light source is mainly disposed on the side of the light guide plate. This PCB board includes a light source, wiring, and power, so that the height is increased. Therefore, there is a problem in that it is difficult to slim the backlight assembly having the same. In addition, since the light guide plate of the backlight assembly is very thick, it is difficult to reduce the weight and slimness of the backlight assembly.

In the case of the cover bottom disposed on the rear surface of the light guide plate, it is mainly made of a painted metal material. Accordingly, there is a problem that the rear surface of the liquid crystal display device is made of a single color, which results in poor aesthetics, and the design of the rear surface of the liquid crystal display device is monotonous.

An object of the present invention is to provide a backlight assembly for lightening and slimming a liquid crystal display device and a liquid crystal display device including the same by including a PCB substrate including a first PCB substrate having a low height.

In addition, another object of the present invention is to provide a backlight assembly for securing aesthetics of a rear surface of a liquid crystal display device by including a cover bottom including photo paper, and a liquid crystal display device including the same.

The backlight assembly of the present invention and a liquid crystal display including the same for solving the problems of the prior art include an optical sheet disposed on a rear surface of a display panel, and a light guide plate disposed on a rear surface of the optical sheet. In addition, a PCB substrate including a first PCB substrate disposed on a side surface of the light guide plate and a second PCB substrate extending perpendicularly to the first PCB substrate and disposed under the light guide plate, and a rear surface of the second PCB substrate It is disposed on and includes a cover bottom containing photo paper.

The backlight assembly and the liquid crystal display device including the same according to the present invention include a PCB substrate including a first PCB substrate having a low height, thereby reducing the weight and slimness of the liquid crystal display device.

In addition, the backlight assembly and the liquid crystal display including the same according to the present invention include a cover bottom including photo paper, thereby ensuring the aesthetics of the rear surface of the liquid crystal display.

1 is a diagram showing a lamination structure of a liquid crystal display device according to the present invention.
2 is a diagram illustrating a cover bottom of a backlight assembly according to the present invention.
3 is a view showing a PCB substrate of the backlight assembly according to the present invention.
4 is an image taken of a rear surface of a liquid crystal display device according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following embodiments are provided as examples in order to sufficiently convey the spirit of the present invention to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. In addition, in the drawings, the size and thickness of the device may be exaggerated for convenience. The same reference numbers throughout the specification indicate the same elements.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only the present embodiments are intended to complete the disclosure of the present invention, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have, and the invention is only defined by the scope of the claims. The same reference numerals refer to the same elements throughout the specification. In the drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity of description.

When an element or layer is another element or referred to as “on” or “on”, it includes not only directly above the other element or layer, but also a case in which another layer or other element is interposed in the middle. do. On the other hand, when a device is referred to as "directly on" or "directly on", it indicates that no other device or layer is interposed therebetween.

The terms "below, beneath", "lower", "above", "upper", which are spatially relative terms, are one element or component as shown in the drawing. It can be used to easily describe the correlation between the and other devices or components. Spatially relative terms should be understood as terms including different directions of the device during use or operation in addition to the directions shown in the drawings. For example, if an element shown in the figure is turned over, an element described as “below” or “beneath” another element may be placed “above” another element. Accordingly, the exemplary term "below" may include both the lower and upper directions.

The terms used in the present specification are for describing exemplary embodiments, and therefore, are not intended to limit the present invention. In this specification, the singular form also includes the plural form unless specifically stated in the phrase. As used in the specification, "comprise" and/or "comprising" refers to the presence of one or more other components, steps, actions and/or elements in which a recited component, step, operation and/or element is Or does not preclude additions.

1 is a diagram showing a lamination structure of a liquid crystal display device according to the present invention. Referring to FIG. 1, a liquid crystal display device 10 according to the present invention includes a liquid crystal display panel 180 and a backlight assembly. The backlight assembly includes a guide panel 150, an optical sheet 160, a light guide plate 110, a reflector sheet 130, a PCB substrate 300, a lower cover 170, and a cover bottom 200.

In addition, the liquid crystal display device 10 further includes an upper cover 140 surrounding a portion of an upper surface of the liquid crystal display panel 180 and a side surface of the backlight assembly. In this case, a pad 145 may be further disposed between the front cover 140 and the liquid crystal display panel 180 so that the upper cover 140 can effectively guide the liquid crystal display panel 180.

Although not shown in the drawing, a polarizing plate may be disposed on the rear surface of the liquid crystal display panel 180. The polarizing plate polarizes the light incident from the backlight assembly and transmits it to the liquid crystal display panel 180, and causes the liquid crystal display panel 180 to display an image.

In addition, the liquid crystal display panel 180 may include a lower substrate, an upper substrate disposed to face the lower substrate, and a liquid crystal layer formed between the lower substrate and the upper substrate to control light transmittance. The lower substrate may include a thin film transistor formed in each cell region defined by data lines and gate lines, and a pixel electrode connected to the thin film transistor. In addition, the upper substrate may include blue, red, and green color filters and a black matrix.

Further, the liquid crystal display panel 180 may have a color filter on transistor (COT) structure in which a color filter and a black matrix are formed on a lower substrate. A thin film transistor may be formed on the lower substrate, a protective layer may be formed on the thin film transistor, and a color filter layer may be formed on the protective layer. Further, a pixel electrode in contact with the thin film transistor is formed on the lower substrate. In this case, in order to improve the aperture ratio and simplify the mask process, the black matrix may be omitted, and the common electrode may be formed to serve as the black matrix.

The guide panel 150 is disposed on a part of the rear surface of the liquid crystal display panel 180, and the guide panel 150 includes the optical sheet 160, the light guide plate 110, the PCB substrate 300, and the lower cover. 170). The guide panel 150 may serve to support the liquid crystal display panel 180. In addition, the guide panel 150 may serve to protect the backlight assembly.

An optical sheet 160 is disposed under the liquid crystal display panel 180 and the guide panel 150. The optical sheet 160 may diffuse and condense light to transmit the light toward the liquid crystal display panel 180. Here, since the guide panel 150 is formed on a part of the rear surface of the liquid crystal display panel 180, a space 100 may be generated between the liquid crystal display panel 180 and the optical sheet 160.

In addition, the optical sheet 160 is not limited to the drawings, and may be formed in multiple layers. For example, the optical sheet 160 may be formed in three layers. The optical sheet 110 may be formed of a diffuser sheet, a lower prism sheet formed on the diffuser sheet, and an upper prism sheet formed on the lower prism sheet.

Here, the diffuser sheet may scatter light transmitted from the light guide plate 120 to uniformize light luminance. In addition, the prism sheet may serve to improve luminance by refracting and condensing light diffused from the diffuser sheet.

The light guide plate 110 is disposed on the rear surface of the optical sheet 160. The thickness of the light guide plate 110 may be 1.5 mm to 2.5 mm. In this case, when the thickness of the light guide plate 110 is less than 1.5 mm, light efficiency may be reduced. In addition, when the thickness of the light guide plate 110 exceeds 2.5 mm, it may be difficult to reduce the weight and slimness of the liquid crystal display device 10.

A reflector sheet 130 may be disposed on the rear surface of the light guide plate 110. The reflector sheet 130 may improve light efficiency by reflecting light emitted from a light source.

The PCB substrate 300 is disposed on the side and rear surfaces of the light guide plate 110 and the reflector sheet 130. Specifically, a first PCB substrate 301 is disposed on at least one side of the light guide plate 110, and a second PCB substrate 302 extending from the first PCB substrate 301 is disposed on the rear surface of the light guide plate 110. Is placed.

In the PCB substrate of the liquid crystal display, a light source and a power supply unit and a wiring unit required to drive the light source are all disposed on the side of the light guide plate 110. The PCB substrate is raised in height to accommodate a light source, a power supply unit, and a wiring unit on the side surface of the PCB substrate. For this reason, there is a problem that it is difficult to slim down a liquid crystal display device using the PCB substrate.

To solve this problem, in the PCB substrate 300 of the liquid crystal display device 10 according to the present invention, the light source is mounted on the first PCB substrate 301 and the power source is disposed on the second PCB substrate 302. In detail, in this case, a light source may be mounted on the first PCB substrate 301. For example, a plurality of light emitting diode (LED) chips may be mounted on the first PCB substrate 301. Through this, light may be transmitted to the light guide plate 110.

The first PCB substrate 301 may have a height of 4 mm to 5 mm. When the height of the first PCB substrate 301 is less than 4 mm, it may be difficult to mount the LED chip. In addition, when the height of the first PCB substrate 301 exceeds 5 mm, it may be difficult to make the liquid crystal display device 10 slim.

In addition, a power supply required to drive the LED chip is disposed on the second PCB substrate 302. In addition, a wiring portion electrically connecting the power source and the light source may be further disposed on the first PCB substrate 301 and the second PCB substrate 302. A portion of the power supply unit and the wiring unit is disposed on the second PCB substrate 302, thereby reducing the height of the first PCB substrate 301. In addition, since the height of the first PCB substrate 301 is lowered, the height of the light guide plate can also be reduced.

A lower cover 170 is disposed on the rear surface of the second PCB substrate 302. The lower cover 170 may fix the optical sheet 160, the light guide plate 110, and the reflector sheet 130. A cover bottom 200 of the liquid crystal display 10 is disposed on the rear surface of the lower cover 170.

The cover bottom of a liquid crystal display is mainly made of aluminum (Al) or electrolytically galvanized steel sheets (EGI) coated. That is, since the cover bottom is made of a single color, it has a very monotonous shape, and there is a problem in that the aesthetics are poor.

To solve this problem, the cover bottom 200 of the liquid crystal display 10 of the present invention may include photo paper. In detail, the cover bottom 200 is disposed on the first cover bottom 201, the second cover bottom 202 disposed on the first cover bottom 201, and the second cover bottom 202. The third cover bottom 303 may be formed. Since the cover bottom 200 is formed of multiple layers, aesthetics may be secured.

In this case, the first cover bottom 201 may be made of transparent plastic. For example, the first cover bottom 201 may be polymethyl methacrylate (PMMA) or polycarbonate (PC). However, the first cover bottom 201 is not limited thereto, and a transparent plastic is sufficient. In addition, the first cover bottom 201 may be disposed to be exposed to the outside.

The second cover bottom 202 may be photo paper. In this case, the photo paper may be a photosensitive material, a picture, a masterpiece, or a photograph using paper on which various colors are printed as a support. Since the first cover bottom 201 overlapping the second cover bottom 202 is made of transparent plastic, the cover bottom 200 may look like a picture frame.

In addition, the third cover bottom 203 may have a structure in which two or more types of layers are stacked. For example, the third cover bottom 203 may be formed of a triple layer consisting of a first layer, a second layer on the first layer, and a third layer on the second layer.

In this case, the first layer and the third layer may be made of a metal, and the second layer may be made of an inorganic material. Through this, the third cover bottom 203 may have a light weight and excellent rigidity.

The liquid crystal display device 10 according to the present invention includes a PCB substrate including the first PCB substrate 301 having a low height, thereby reducing the weight and slimness of the liquid crystal display device 10. In addition, the liquid crystal display device 10 according to the present invention includes a cover bottom 200 including photo paper and, thereby ensuring the aesthetics of the rear surface of the liquid crystal display device 10. Accordingly, the liquid crystal display device 10 according to the present invention can be used in various display devices such as a frame-type wall-mounted display device and a front/rear rotating display device.

Next, referring to FIG. 2, a detailed review of the cover bottom according to the present invention is as follows. 2 is a diagram illustrating a cover bottom of a backlight assembly according to the present invention. Referring to FIG. 2, the cover bottom 200 according to the present invention includes a first cover bottom 201, a second cover bottom 202 on the first cover bottom 201, and a second cover bottom 202. It consists of a third cover bottom (203).

In this case, the first cover bottom 201 may be disposed to be exposed to the outside. In addition, the third cover bottom 203 may be disposed to face the first cover bottom 201 and may be disposed to overlap the cover bottom of the backlight assembly.

The first cover bottom 201 may be made of transparent plastic. The second cover bottom 202 may be formed of photo paper including various images. In this case, the area on which the image of the second cover bottom 202 is printed may be disposed to face the rear surface of the liquid crystal display panel. That is, the front side of the liquid crystal display can watch an image emitted from the liquid crystal display panel, and the rear side of the liquid crystal display can view the image printed on the photo paper of the cover bottom 200.

In this case, since the first cover bottom 201 is made of transparent plastic, it may have the same effect as glass. That is, since the first cover bottom 201 is made of transparent plastic, there is an effect of making the cover bottom 200 look like a picture frame together with the second cover bottom 202.

In this case, the height of the first cover bottom 201 may be 1.0 mm to 1.5 mm. When the height of the first cover bottom 201 is less than 1.0 mm, it may be difficult for the first cover bottom 201 to have a glass-like effect. In addition, when the height of the first cover bottom 201 exceeds 1.5 mm, it may be difficult to make the liquid crystal display device slim.

In addition, the third cover bottom 203 may be formed of a first layer 204, a second layer 205 on the first layer 204, and a third layer 206 on the second layer 205. have. In this case, the first layer 204 and the third layer 206 may be made of metal. For example, it can be made of aluminum (Al) or electrolytically galvanized steel sheets (EGI). However, the first layer 204 and the third layer 206 of the third cover bottom 203 are not limited thereto, and may be formed of various metals.

The second layer 205 of the third cover bottom 203 may be formed of an inorganic material. In addition, the second layer 205 may include a core. For example, the second layer 205 may be made of a material selected from the group consisting of paper, wood, synthetic resin, foam synthetic resin, foam rubber, and mixtures thereof. However, the material of the second layer 205 is not limited thereto, and an inorganic lightweight material is sufficient.

In addition, the second layer 205 may include a core. For example, the second layer 205 may be porous. Through this, there is an effect of improving the rigidity of the third cover bottom 203 and reducing the weight.

The third cover bottom 203 is disposed on the rear surfaces of the first cover bottom 201 and the second cover bottom 202 to stably support the first cover bottom 201 and the second cover bottom 202 can do.

Since the cover bottom 200 of the liquid crystal display according to the present invention includes the second cover bottom 202 disposed on the rear surface of the first cover bottom 201, the rear surface of the liquid crystal display can have the same effect as a picture frame. . That is, the aesthetics of the rear surface of the liquid crystal display device may be improved through the cover bottom 200.

Next, a detailed review of the PCB substrate according to the present invention with reference to FIG. 3 is as follows. 3 is a view showing a PCB substrate of the backlight assembly according to the present invention. Referring to FIG. 3, the PCB substrate 300 according to the present invention includes a first PCB substrate 301 and a second PCB substrate 302. The second PCB substrate 302 may extend vertically from the first PCB substrate 301. The first PCB substrate 301 may be disposed on the side of the light guide plate in the backlight assembly, and the second PCB substrate 302 may be disposed on the rear side of the light guide plate.

A light source 303 may be mounted on the first PCB substrate 301. In detail, a plurality of light sources 303 may be disposed on the first PCB substrate 301 to be spaced apart from each other at regular intervals.

A power supply unit 305 may be disposed on the second PCB substrate 302. A signal may be transmitted from the power supply unit 305 to the light source 303 through the wiring unit 305. In this case, a part of the wiring part 305 is disposed on the second PCB substrate 302, and the remaining part of the wiring part 305 is disposed on the first PCB substrate 301.

In this way, a partial region of the wiring unit 304 and the power supply unit 305 are disposed on the second PCB substrate 302, so that the height of the first PCB substrate 301 may be lowered. In detail, the first PCB substrate 301 may have a height of 4 mm to 5 mm.

The height of the PCB substrate 300 may be the same as the height of the first PCB substrate 301. That is, as the height of the first PCB substrate 301 is lowered, the height of the PCB substrate 300 may be lowered.

In the PBC substrate according to the present invention, the light source 305 is disposed on the first PCB substrate 301 disposed on the side of the light guide plate, and the power source 305 is disposed on the second PCB substrate 302 disposed on the rear side of the light guide plate. By being disposed, there is an effect of reducing the height of the PCB substrate 300.

Next, a rear surface of the liquid crystal display device according to the present invention will be described with reference to FIG. 4. 4 is an image taken of a rear surface of a liquid crystal display device according to the present invention. Referring to FIG. 4, the liquid crystal display according to the present invention includes a cover bottom including photo paper on which various types of images are printed, so that the aesthetics of the rear of the liquid crystal display may be improved as illustrated in FIG. 4.

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 technical idea of the present invention. Accordingly, the technical scope of the present invention should not be limited to the content described in the detailed description of the specification, but should be determined by the claims.

110: light guide plate
180: liquid crystal display panel
200: cover bottom
201: first cover bottom
202: second cover bottom
203: third cover bottom
300: PCB board

Claims (20)

Optical sheet;
A light guide plate on the rear surface of the optical sheet;
A PCB substrate including a first PCB substrate disposed on a side surface of the light guide plate and a second PCB substrate extending perpendicularly to the first PCB substrate and disposed under the light guide plate;
A lower cover disposed on the rear surface of the second PCB substrate and fixing the light guide plate; And
Including a cover bottom disposed on the rear surface of the lower cover,
The cover bottom is
A first cover bottom exposed to the outside;
A second cover bottom disposed on the first cover bottom and made of photo paper; And
A backlight assembly including a third cover bottom disposed on the second cover bottom, facing the lower cover, and supporting the first and second cover bottoms.
The method of claim 1,
The light guide plate has a thickness of 1.5 mm to 2.5 mm.
The method of claim 1,
A backlight assembly in which a light source is mounted on the first PCB substrate.
The method of claim 1,
The height of the first PCB substrate is 4 mm to 5 mm backlight assembly.
The method of claim 1,
The second PCB substrate is a backlight assembly including a power supply.
delete The method of claim 1,
The first cover bottom is a backlight assembly made of transparent plastic.
The method of claim 1,
The photo paper is a backlight assembly made of a photosensitive material, a picture, a masterpiece, or a photograph using paper on which various colors are printed as a support.
The method of claim 1,
The third cover bottom is a backlight assembly including a first layer, a second layer on the first layer, and a third layer on the second layer.
The method of claim 9,
The first and third layers are made of metal,
The second layer is made of an inorganic material and a backlight assembly including a core.
The backlight assembly according to any one of claims 1 to 5 and 7 to 10; And
A liquid crystal display device including a display panel disposed on the optical sheet of the backlight assembly.
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