KR101147108B1 - Light Guide Plate having Serration Film, and Backlight Unit Using the Same - Google Patents

Abstract

The present invention provides a light guide plate including a light guide plate, and a serration film including a base film attached to a side of the light guide plate and a serration film coated on one surface of the base film and including a serration part having a sawtooth shape. . In addition, the backlight unit of the present invention is a light guide plate including a serration film, a light source installed on one side of the serration portion of the light guide plate including the serration film, a diffusion film laminated on the upper surface of the light guide plate including the serration film. And a prism sheet laminated on the upper surface of the diffusion film.

Description

Light guide plate having a serration film and a backlight unit using the same {Light Guide Plate having Serration Film, and Backlight Unit Using the Same}

The present invention relates to a light guide plate including a serration film and a backlight unit using the same, and more particularly, to minimize a dark area according to the light emission angle characteristic of the LED, and to prevent deformation of the film due to heat generation. The present invention relates to a light guide plate including a serration film and a backlight unit using the serration film to form a serration portion on a light incident surface of a large light guide plate.

In general, a liquid crystal display (LCD) does not emit light by itself, and thus a separate surface light source unit is mainly installed on the rear of the LCD. The light incident on the LCD panel from the surface light source unit uniformly illuminates the entire LCD screen, so that a surface light source unit that allows characters or images to be viewed on the LCD is called a backlight unit. The backlight unit is generally composed of a composite of a light source, a reflecting plate, a light guide plate, a diffusion plate, and a prism sheet.

In addition, a light guide plate (LGP) is a display component for performing brightness and uniform illumination function of a backlight unit. The light guide plate (LGP) is configured to receive light incident from a light source such as a light emitting diode (LED). It is a kind of plastic molded lens that serves to uniformly transfer to the entire surface of the display device.

Since all types of LCD panels require the use of a surface light source device, the uniformity of the entire screen and the amount of light transmitted by the brightness (luminance, cd / m²) and uniformity (%) Is determined. Such a surface light source unit requires a high level of technology to realize thin, light, high brightness, low power, and uniformity.

Recently, liquid crystal displays are used in not only small display products such as mobile phones or PDAs but also large display products such as large TVs or electronic bulletin boards to secure product competitiveness in various aspects such as light weight, thinness, low power, high brightness, and durability. Criteria for quality demanded by consumers are gradually increasing.

However, the backlight unit used in a liquid crystal display device having a size of a conventional TV, a monitor, etc. is changed from a cold cathode fluorescent lamp (CCFL), which is a linear light source, to an LED light source, which is a point light source, for the purpose of thinning and low power consumption. If the configuration is small, the brightness is low, there is a problem that a large number of dark areas that do not give visual information to the display panel in some sections beyond the angle of incidence of the light source. In order to solve this problem, there are a number of problems such as film deformation, product cost increase, power consumption increase and film aging, and difficulty in thinning due to deformation due to the high heat generation caused by the use of the LED light source. It was.

In addition, since the conventional light guide plate for a small backlight unit is manufactured through injection, it was possible to manufacture by using the core of the serration part in the mold, but in the case of the large light guide plate which cannot be injected, the processing of the serration part became a problem while using an extruded light guide plate. .

1 is an explanatory diagram schematically showing a method of processing a serration part of a large light guide plate for a TV and a monitor possible in the prior art. As shown in FIG. 1, in order to form the serration portion 20 on the side surface of the large light guide plate 10 according to the related art, a plurality of light guide plates 10 are stacked, and then the side surfaces of the stacked large light guide plates are bite. The cutting method using a cutting tool such as) was used. However, according to the related art, since the cutting is performed using a cutting tool, a mirror treatment such as a post-processing process, that is, a fine polishing, must be performed, and when a serration portion is formed on a large light guide plate, the light guide plate is processed during the process. There was a problem that it is deformed by heat and physical force. Therefore, according to the prior art, it is not only a difficult process to form the serration portion on the side of the light guide plate, but also has a disadvantage in that fine processing is impossible and the defect rate is high. Or forming the serration part in the light incident part surface of the cast large light-guide plate board was not performed.

In order to solve the problems of the prior art, the present inventors can prevent the formation of a dark portion and light loss for incident light, and prevent deformation of the film due to heat generation. The present invention has led to the development of a light guide plate including a serration film that can be applied and reduce manufacturing costs, and a backlight unit using the same.

An object of the present invention is to provide a light guide plate and a backlight unit using the serration film that can prevent the formation of the dark portion and the light loss to the incident light even when using a small number of LEDs.

Another object of the present invention is to provide a light guide plate including a serration film capable of preventing deformation of the film due to heat generation and a backlight unit using the same.

Still another object of the present invention is to provide a light guide plate including a serration film applicable to a large light guide plate and a backlight unit using the same.

Still another object of the present invention is to provide a light guide plate including a serration film and a backlight unit using the same, which can reduce manufacturing cost.

The above and other objects of the present invention can be achieved by the present invention described below.

The light guide plate including the serration film according to the present invention is a light guide plate; And a serration film coated on one side of the base film and a base film attached to the side of the light guide plate and including a serration part having a sawtooth shape.

Here, the base film is characterized in that it further comprises a transparent adhesive layer on the surface attached to the light guide plate.

The base film is characterized in that it further comprises an infrared coating layer on the opposite side of the surface on which the serration portion is formed.

The infrared coating layer is characterized in that it further comprises a transparent adhesive layer on at least one side.

The serration part is characterized in that it has a sawtooth shape of the intaglio or embossed at regular intervals.

In addition, the backlight unit using the light guide plate including the serration film according to the present invention, the light guide plate including the serration film of the present invention; A light source installed on one side of a serration part of the light guide plate including the serration film; A diffusion film laminated on an upper surface of the light guide plate including the serration film; And a prism sheet laminated on the upper surface of the diffusion film.

The present invention can prevent the formation of a dark portion and light loss for incident light even with a small number of LEDs, can prevent deformation of the film due to heat generation, can be applied to a large light guide plate, and can reduce the manufacturing cost It has the effect of providing an light guide plate including a serration film and a backlight unit using the same.

1 is an explanatory diagram schematically showing a method of processing a serration portion of a large light guide plate for a TV and a monitor possible according to the prior art;
Figure 2 is an exploded perspective view schematically showing a light guide plate including a serration film according to the present invention
3 is an exploded perspective view schematically showing an embodiment of a backlight unit using a light guide plate including a serration film according to the present invention;
4 is an exploded perspective view schematically showing another embodiment of a backlight unit using a light guide plate including a serration film according to the present invention;

Hereinafter, a light guide plate including a serration film and a backlight unit using the same according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the following description, and has a general knowledge in the art. If the present invention can be implemented in various other forms without departing from the spirit of the present invention.

2 is an exploded perspective view schematically illustrating a light guide plate including a serration film according to the present invention.

As shown in FIG. 2, the light guide plate 100 including the serration film according to the present invention includes a light guide plate 110 and a serration film 120 attached to a side surface of the light guide plate, and the serration film 120. ) Includes a base film 122 and a serration part 121 coated on one surface of the base film. In order for the base film 122 to be attached to the side surface of the light guide plate, the base film may be formed of a film including an adhesive polymer. However, in consideration of optical properties, the base film 122 may include a transparent adhesive layer (not shown) between the light guide plate and the base film. It is preferable to construct. Here, the material of the light guide plate 110 is not particularly limited, but it is preferable to use a polycarbonate (PC) substrate having excellent heat resistance or a poly methyl methacrylate (PMMA) substrate having excellent refractive index. The material of the base film 122 is not particularly limited, and it is preferable to use a thin transparent plastic film. In addition, the serration unit 121 may be formed of a resin having excellent adhesion to adhere to the base film 122. However, when the adhesion is not excellent, the serration part 121 may form an adhesive layer on the surface of the base film. Can be used. The serration part 121 is preferably formed on the surface of the base film is coated in a manner to form a light guide plate including a serration film using a roller attachment method including a cutting device.

In addition, in order to prevent deformation of the film due to heat generation from the light source, an infrared (IR) coating layer (not shown) may be formed on one surface of the base film 122. For example, when the infrared coating layer is disposed between the base film and the light guide plate, only light in the infrared wavelength range is incident into the light guide plate due to the filtering effect of the infrared coating layer among the light bands incident from the light source. The amount of generated heat is significantly reduced. Therefore, it is possible to prevent film deformation due to heat generation by reducing the amount of heat generated by light that affects the light guide plate without affecting the optical effect.

3 is an exploded perspective view schematically showing an embodiment of a backlight unit using a light guide plate including a serration film according to the present invention.

As shown in FIG. 3, the light guide plate 100 including the serration film according to the present invention includes a light source 200 disposed on a side thereof, and a diffusion film 300 disposed on an upper surface of the light guide plate including the serration film. Stacked), and the prism sheet 400 is laminated on the upper surface of the diffusion film. Here, the serration portion of the light guide plate 100 including the serration film may be formed to have an intaglio tooth shape repeated at regular intervals. Incident light incident from the light source 200 by the serration having a serrated jagged shape is refracted by the serration and, when forming the IR coating layer, is filtered by the IR coating layer to minimize the formation of the dark portion and to prevent thermal deformation. It can be manufactured as a backlight unit capable of.

4 is an exploded perspective view schematically showing another embodiment of a backlight unit using a light guide plate including a serration film according to the present invention.

As illustrated in FIG. 4, the serration portion of the light guide plate 100 including the serration film according to the present invention may be formed to have a sawtooth shape of embossed portions that are repeated at regular intervals. Incident light incident from the light source 200 by the serration part having the above-described shape is refracted by the serration part, and when the IR coating layer is formed, the IR coating layer is filtered by the IR coating layer to minimize the formation of the dark part and prevent thermal deformation. Can be manufactured as a back light unit. Regarding the shape of the serration part and the serration film according to the present invention, a simple deformation and a change in the shape of the serration part which can be easily derived by those skilled in the art from this specification, or a minute design change and arrangement change of the serration film are all present. It will be considered to belong to the scope of the invention.

100: light guide plate 110 including a serration film: light guide plate
120: serration film 121: serration section
122: base film 200: light source
300: diffusion film 400: prism sheet

Claims (6)

Light guide plate; And
A serration film coated on one side of the base film and a base film attached to the side of the light guide plate and including a serration part having a sawtooth shape;
To include, The base film is a light guide plate comprising a serration film, characterized in that it comprises an infrared coating layer on the opposite side of the surface on which the serration portion is formed. The light guide plate of claim 1, wherein the base film further comprises a transparent adhesive layer on a surface attached to the light guide plate. delete The light guide plate of claim 1, wherein the infrared coating layer further comprises a transparent adhesive layer on at least one surface. The light guide plate of claim 1, wherein the serration portion has a serrated shape of an intaglio or an embossment at predetermined intervals. Claims 1, 2, 4 or 5, wherein the light guide plate comprising a serration film according to any one of claims;
A light source installed on one side of a serration part of the light guide plate including the serration film;
A diffusion film laminated on an upper surface of the light guide plate including the serration film; And
A prism sheet laminated on the upper surface of the diffusion film;
Backlight unit using a light guide plate comprising a serration film comprising a.

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