KR200349270Y1 - Prism film employing lihgt-shielding layer and backlight unit of LCD having the same - Google Patents

Abstract

The present invention provides a prism plate constituting a backlight unit of a liquid crystal display device in which a light shielding layer coated with a light shielding material is formed, a liquid crystal display device employing such a prism plate, and an electronic product having the liquid crystal display device. It is started. The prism plate on which the light shielding layer of the present invention is formed has a light shielding effect as compared to a conventional prism plate, and the light shielding process by printing can facilitate the formation of the light shielding means, and can improve mass productivity.

Description

Prismatic film employing a light shielding layer and a backlight unit of a liquid crystal display employing the same {Prism film employing lihgt-shielding layer and backlight unit of LCD having the same}

The present invention relates to a prism plate constituting a backlight unit of a liquid crystal display device and a backlight unit of a liquid crystal display device employing the same, and more particularly, a prism plate constituting a backlight unit of a liquid crystal display device in which a light shielding layer is formed. And a backlight unit of a liquid crystal display device employing the same.

LCD backlight is basically composed of light source lamp, light guiding plate (light wave guide), reflector sheet (diffuser sheet), diffuser film (diffuser film or diffusion sheet), and prism film (prismatic film or prism sheet). The structural diagram is shown in FIG. The backlight unit of the liquid crystal display device will be briefly described with reference to FIG. 1.

The lamp is a light source that injects light into the LCD panel through the backlight unit. The types of lamps are mainly used, such as LED (Light Emitting Diodes), organic EL (ElectroLuminescent), and CCFL (Cold Cathode Fluorescent Lamp). The light guide plate is a component that converts light incident from a lamp into uniform plane light, and mainly uses PMMA (polymethymethacrylate), which is an acrylic resin. This is because the absorption of light in the visible region is the lowest among the polymers because of the good transparency and gloss. The reflector is located under the light guide plate, and reflects the light incident from the lamp in the direction of the light emitting surface of the backlight to increase the light utilization efficiency. Also, by adjusting the amount of reflection of the entire incident light, the light emitting surface of the backlight has a uniform luminance distribution. do. The material of the reflector is mainly a polyester film or a metal coating film. The diffusion plate is positioned toward the liquid crystal panel on the light guide plate, and diffuses and scatters the light incident through the light guide plate, thereby increasing and uniforming the luminance in the front direction of the backlight exiting surface. The material of the diffusion plate mainly uses a polyester (PET) resin capable of good light diffusing ability and high brightness, and a surface diffusion layer is coated on the PET film to increase the light diffusing ability. The prism plate prevents the light from the diffuser from exiting in the direction other than the front surface of the light-emitting surface, improves the light directivity, and narrows the viewing angle, thereby increasing the brightness toward the front surface of the backlight surface.

Since the liquid crystal display module has low efficiency such that only 3% to 10% of the light incident from the light source is transmitted, it is necessary to prevent the light from the light source from leaking out. Therefore, the part of the color filter that blocks light in order to prevent light leakage is patterned in black, which is commonly referred to as a black matrix.

Republic of Korea Patent Application No. 10-2000-0083249 means that the seal provided inside the edge of the panel of the liquid crystal display device to block the light to be used as a light blocking auxiliary material of the black matrix to achieve a uniform light blocking Is starting. In addition, Korean Utility Model Registration Application No. 20-2001-00014422 discloses a liquid crystal panel having a black silk layer formed by a printing process for light blocking means in a lower edge region of a liquid crystal panel in which liquid crystal is injected.

However, since the light blocking of the black matrix is limited, when the liquid crystal display device is manufactured, a light blocking means called a light blocking tape is attached, which is usually done manually. If it is made by hand, the defective rate is considerably high, there is a problem that the cost of the backlight unit increases due to problems such as labor costs. They try to solve the shading problem by trying to add shading means to the LCD panel rather than the backlight. The above-described technique using the black matrix is applied to the lower part of the liquid crystal panel, and is not directly applied to the light guide plate, diffuser plate or prism plate constituting the actual backlight unit, and does not disclose the method of applying the lower liquid crystal panel. .

In addition, Korean Patent Application No. 10-1998-0008056 discloses a diffusion sheet having a technical feature of increasing the luminance of the screen display area of the liquid crystal display by forming a reflective material layer on the edge of the diffusion sheet. The above-described technique does not disclose the light shielding means, and there is a problem that the light shielding means must be manually attached. In addition, the light shielding layer and the reflective layer may be simultaneously formed, so that the diffusion plate constituting the backlight unit of the liquid crystal display device capable of lowering the production cost while simultaneously performing the light shielding function and the reflective function may not be disclosed. It is not.

The present invention is to provide a prism plate of the backlight unit of the liquid crystal display device, characterized in that the light shielding layer is formed on the edge of the prism plate constituting the backlight unit as a light source.

Another technical object of the present invention is to provide a backlight unit, a liquid crystal display device including the backlight unit, and a mobile phone, a monitor, a digital TV, and a PDA including the prism plate. And a laptop computer.

1 is a conceptual diagram of a configuration of a conventional light guide plate type backlight unit.

2 is a configuration diagram of an embodiment of a prism plate of the present invention in which a light shielding layer is formed on one surface of a prism plate.

3 is a configuration diagram of an embodiment of a prism plate of the present invention in which light shielding layers are formed on both surfaces of a prism plate.

4 is a configuration diagram of an embodiment of a prism plate of the present invention in which a light shielding layer is formed on one surface of a prism plate, and an adhesive layer is formed on an outer surface of the light shielding layer.

5 is a configuration diagram of an embodiment of a prism plate of the present invention in which a light shielding layer is formed on one surface of a prism plate, and a reflective layer is formed on the rear surface of the prism plate.

6 is a configuration diagram of an embodiment of a prism plate of the present invention in which a light shielding layer is formed on one surface of a prism plate, and a reflective layer is formed on an outer surface of the light shielding layer.

7 is a configuration diagram of an embodiment of a prism plate of the present invention in which a reflective layer is formed on one surface of a prism plate, and a light shielding layer is formed on an outer surface of the reflective layer.

8 is a configuration diagram of an embodiment of a prism plate of the present invention in which a light blocking layer is formed on one surface of a prism plate, a reflective layer is formed on an outer surface of the light blocking layer, and an adhesive layer is formed on the outer surface of the reflective layer.

9 is a configuration diagram of an embodiment of a prism plate of the present invention in which a light blocking layer is formed on one surface of a prism plate, and a release layer is formed on an outer surface of the light blocking layer.

10 is a prism plate of the present invention in which a light shielding layer is formed on one surface of a prism plate, and a first prism plate having a reflective layer is formed on a rear surface of the prism plate and a conventional prism plate having no light shielding layer formed thereon. It is a block diagram of an embodiment.

11 is a view of a prism plate of the present invention in which a light shielding layer is formed on one surface of a prism plate, and a first prism plate having a reflective layer is formed on a rear surface of the prism plate, and a second prism plate having a light shielding layer is combined. It is a block diagram of an Example.

12 is a conventional light guide plate type backlight unit formed of a prism plate, a diffuser plate, a light guide plate, a reflector plate, and a light source, wherein the prism plate has a light shielding layer formed on one surface thereof, and a reflective layer formed on the rear surface of the prism plate A configuration diagram of an embodiment of the backlight unit of the present invention exists in the form of a combination of a prism plate and a conventional prism plate on which no light shielding layer is formed.

*** Explanation of symbols for the main parts of the drawing ***

100: prism plate 200: diffuser plate

300: light guide plate 400: reflector

500: light source 150: light shielding layer

170: adhesive layer 190: reflective layer

195: release layer

The prism plate constituting the backlight unit of the liquid crystal display according to the present invention for achieving the above technical problem, characterized in that it comprises a light shielding layer formed on a portion of the prism plate containing a light shielding material to block light. do.

The light blocking layer may be formed on at least a part of the edge of the prism plate, preferably, it is formed over the entire edge of the prism plate. The light blocking layer may be formed only on one surface of the prism plate, and the light blocking layer may be formed on both surfaces of the prism plate.

The light blocking layer has a thickness of 10 micrometers to 150 micrometers, and the light blocking material of the light blocking layer is black ink.

The light blocking layer may further include an adhesive material together with the light blocking material. The light blocking layer may further include an adhesive layer formed on an outer surface of the light blocking layer and including an adhesive material. The adhesive layer may be oily, and the adhesive material may be aqueous. The width of the light blocking layer is preferably 2% to 20% of the width of the prism plate.

The light blocking layer may be printed on an edge of the prism plate, and the printing method of forming the light blocking layer may be one of silk screen printing or gravure printing. The adhesive layer may be printed on the edge of the prism plate, the printing method for forming the adhesive layer may be any one of silk screen printing or gravure printing.

The prism plate may further include a reflective layer formed on at least one surface and including a reflective material for reflecting light. The reflective layer may be formed on the same side as the light blocking layer forming surface of the prism plate, wherein the reflective layer may be disposed on an outer surface of the light blocking layer of the prism plate, and the light blocking layer is the prism It may be disposed on the outer surface of the reflective layer of the plate. The reflective layer may be formed on the rear surface of the light shielding layer formation surface.

The reflective material forming the reflective layer may include at least one selected from the group consisting of white ink and silver ink, and the reflective layer may be formed by a silk screen printing method. The reflective layer may further include an adhesive material together with the reflective material, and may further include an adhesive layer formed on an outer surface of the reflective layer and including an adhesive material.

It may further include a release layer attached to at least one outer surface of the prism plate.

The backlight unit of the present invention may be provided with at least one prism plate.

Another object of the present invention is to provide a backlight unit employing the prism plate, a liquid crystal display device employing the backlight unit, and an electronic product employing the liquid crystal display device. Such electronic products naturally include portable telephones, monitors, and notebook computers.

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

2 is a structural diagram of the prism plate 100 of the present invention in which the light shielding layer 150 of the present invention is formed. The light blocking layer 150 may be formed on one surface of the prism plate 100 as shown in FIG. 2. 3 illustrates that the light blocking layer 150 is formed on both surfaces of the prism plate 100.

Since the prism plate 100 of the present invention needs to be combined with other components such as a diffuser plate when used in the backlight unit, the prism plate 100 may additionally retain adhesive properties for ease of coupling with other components. There may be a need. At this time, there are two ways of having an adhesive property.

First, the light blocking material or other functional material constituting the light blocking layer 150 formed on the prism plate 100 or a layer having another function (for example, a reflective layer 190 containing a reflective material). The adhesive material is contained in or mixed with the light shielding layer 150 or other functional layers as a whole. At this time, the method of applying the adhesive material is the same as the method of applying the light-shielding material or other functional material.

Second, the adhesive layer 170 including the adhesive material is formed on at least one surface of the prism plate 100 as an independent layer. 4 illustrates that the adhesive layer 170 is formed on the outer surface of the light blocking layer 150 formed on one surface of the prism plate 100. In this case, the adhesive layer 170 may be formed on both sides of the prism plate 100. The adhesive layer 170 may be formed directly on the prism plate 100, or may be formed on an outer surface of the light blocking layer 150 or a layer having other functions. 8 illustrates that the adhesive layer 170 may be formed on the outer surface of the reflective layer 190.

The prism plate 100 of the present invention may further include a reflective layer 190 formed on at least one surface thereof and including a reflective material for reflecting light. The relative positional relationship between the reflective layer 190 and the light blocking layer 150 becomes important. The relative positional relationship is largely divided into two types, in which two layers are formed on the same side with respect to the prism plate 100 or are formed on the opposite back side.

FIG. 5 illustrates that the reflective layer 190 may be formed on the rear surface of the light blocking layer 150. In this case, the side with the reflective layer 190 becomes the light source 500 in the backlight unit.

6 and 7 illustrate that the reflective layer 190 may be formed on the same side as the surface of the light blocking layer 150 of the prism plate 100. 6 illustrates that the reflective layer 190 may be disposed on an outer surface of the light blocking layer 150 of the prism plate 100, and FIG. 7 shows that the light blocking layer 150 is the prism plate 100. It can be shown that can be disposed on the outer surface of the reflective layer 190. In this case, the side where the reflective layer 190 is located becomes the light source 500 in the backlight unit.

The prism plate 100 of the present invention may further include a release layer 195 on at least one outer surface of the prism plate 100 for the purpose of storage, transportation or delivery convenience and pollution prevention. The release paper constituting the release layer 195 is also called a release paper and protects the surface by contacting the adhesive tape, pressure-sensitive adhesive paper, or other adhesive surface of the adhesive object. When used, the surface is peeled off to achieve its purpose.

Release paper employed in the present invention can be divided into paper release paper and film release paper. Paper release paper refers to the lamination of polyethelene (PE) on paper and the coating of silicone release agent or fluorine release agent. As a kind of paper, a grinding paper, a graft paper, etc. are used normally. As the release agent, silicone and fluorine are typical, but synthetic resins may sometimes be paraffin or release.

In the case of a film release paper, a silicone release agent or a fluorine release agent is coated on a polyethelene terephthalate (PET). In addition to PET, there are release films in which other films such as PE are used.

In the prism plate 100 of the present invention, the functional release layer 195 may not be an essential component, but may be formed for additional functions of storage, transportation, delivery convenience, or pollution prevention. In this case, the release layer 195 may be formed on one or both outer sides of the prism plate 100 of the present invention. In particular, when the adhesive layer 170 on the outer surface of the prism plate 100 of the present invention, or when the light shielding layer 150 or the reflective layer 190 includes an adhesive material, the adhesive layer 170, the light shielding layer 150 In addition, the release layer 195 may be included on the outer surface of the reflective layer 190. 9 illustrates that the release layer 195 may be formed on an outer surface of the light blocking layer 150 formed on the prism plate 100.

The prism plate 100 constituting the backlight unit is generally composed of one piece or two or more pieces. In the case of the prism plate 100 composed of two or more pieces, at least one or more of the prism plates 100 may be the prism plate 100 including the light shielding layer 150 of the present invention. FIG. 10 illustrates a conventional first prism plate 100 having no light shielding layer 150 and a second prism plate 100 including a light shielding layer 150 and a reflecting layer 190. In addition, the eggplant shows the prism plate 100 of the present invention. At this time, the side where the reflective layer 190 is formed becomes the light source 500 side of the backlight unit. FIG. 11 illustrates that a first prism plate 100 having a light shielding layer 150 and a second prism plate 100 having a light shielding layer 150 and a reflection layer 190 are stacked to have a double shielding function and a reflection function. The prism plate 100 of the present invention is shown. At this time, the side where the reflective layer 190 is formed becomes the light source 500 side of the backlight unit.

The prism plate 100 of the present invention is applied to the backlight unit, and FIG. 12 shows how the prism plate 100 of the present invention can be applied to the backlight unit. There is a light source 500 and a light guide plate 300, a reflector plate 400 below the light guide plate 300, a diffuser plate 200 above the light guide plate 300, and the diffusion plate 200. A light guide plate type backlight unit having a prism plate 100 thereon is shown. The prism plate 100 includes a first prism plate 100 including the light blocking layer 150 and a second prism plate 100 without the light blocking layer 150, and the first prism plate 100. The reflective layer 190 is formed on one surface of the prism plate 100 in the direction of the light source 500, and the light blocking layer 150 is formed on one surface of the first prism plate 100 in the direction of the second prism plate 100. The prism plate 100 which performs the light blocking function and the reflective function at the same time may be configured.

The light blocking material constituting the light blocking layer 150 may be a material including a black pigment or a dye that may block or absorb light. Examples of the light blocking material may be black ink, black toner, black paint, and the like, and black ink is preferable. A binder, a solvent, a surfactant, etc. other than the black pigment and dye constituting the black ink are not particularly limited.

The light blocking layer 150 may be formed on a part of the edge of the prism plate 100, but is preferably formed over the entire edge of the prism plate 100. FIG. 2 shows that the light blocking layer 150 is formed between all edges of the prism plate 100. In this case, the light blocking layer 150 formed at the edge may have a linear shape. The width of the prism plate 100 refers to a length of the horizontal or vertical length of the prism plate 100 on which the light blocking layer 150 is formed.

The width of the light blocking layer 150 to which the light shielding layer 150 is applied or printed on the prism plate 100 may vary depending on the width of the prism plate 100, but is 0.5% to 25% of the width of the prism plate 100. It is preferable, 2%-20% are more preferable, It is good to have a width of 3%-10% most preferably.

The light blocking layer 150 formed on the prism plate 100 of the liquid crystal display backlight unit of the present invention may include an adhesive material. The adhesive substance is not particularly limited. When the light shielding material and the adhesive material are mixed to form one light shielding layer 150, the relative weight ratio of the light shielding material and the adhesive material is preferably 20 parts by weight to 500 parts by weight with respect to 100 parts by weight of the light blocking material. 35 parts by weight to 250 parts by weight are more preferred, and 50 parts by weight to 200 parts by weight are most preferred.

As shown in FIGS. 2 and 3, the adhesive material may be mixed with the light blocking material to form one light shielding layer 150, and the adhesive layer 170 composed of only the adhesive component may directly contact the prism plate 100. Alternatively, the light blocking layer 150 may be formed on the outer surface of the light blocking layer 150 or the outer surface of the reflective layer 190 formed on the prism plate 100.

The adhesive material constituting the adhesive layer 170 is not particularly limited as long as it has adhesiveness. Therefore, it may be an oily adhesive material or an aqueous adhesive material. However, it is necessary to match the properties of the solvent constituting the light blocking material in relation to the light blocking material, or the properties of the solvent constituting the reflective material in relation to the reflective material. In an embodiment of the present invention, since the black ink is used as the light blocking material, and the solvent constituting the black ink may be an aqueous solvent such as water, in this case, the adhesive material is preferably aqueous. If the solvent is oily, an oily adhesive material may be more preferable than an aqueous adhesive material. Such an adhesive component may facilitate coupling of the prism plate 100 with other components constituting the backlight unit of the liquid crystal display.

The light blocking layer 150 may be formed by applying a light blocking material to the prism plate 100 or another reflective layer 190 formed on the prism plate 100. The method of applying the light blocking material may vary depending on the nature and type of the light blocking material. The light-shielding material application method that can be used when the light-shielding material is black ink may be printing, painting, spraying, laser printing printing, and the like, and is preferably formed by a printing method. When the light blocking material has a toner form, a thermal bonding method may be used, and a copier or the like may be used.

As the printing method, a silk screen printing method, a gravure printing method, a master printing method, an offset printing method, a flexographic printing (flexography), a transfer printing, or the like may be borrowed, but a silk screen printing method is most preferred. The silk screen printing method is a printing method that transfers ink to paper by passing ink through a mesh hole using a plate composed of wires on a surface of a wooden frame attached to a mesh. In the past it was called silk screen printing because it used silk mesh, and recently it is called screen printing because it uses nylon, tetron, and stainless steel mesh. (In the specification and claims of the present invention, silk screen printing is equivalent to screen printing. The screen printing machine has a flat printing machine and a curved printing machine. The flat printing machine prints paper, plastic, printed wiring board, etc., and the curved printing machine prints on bottles and cups. The flatbed printing machine places a screen frame with a mesh on the paper, and then pushes ink into the screen hole with a rubber spatula called a squeegee. The curved printing machine fixes the squeegee and rotates the printed object as the screen moves to print. This method has the advantage of being able to print on a wide range of materials such as paper, plastic, glass, and metal since the one side is flexible and the printing pressure is weak.

When the light shielding material is printed on the prism plate 100 by the silk screen printing method, the number of meshes (MESH) of the screen mesh becomes important in order to produce a desired light shielding effect. Although mesh of 50 to 450 mesh may be used, preferably 70 to 350 mesh, more preferably 80 to 250 mesh, and most preferably 90 to 150 mesh.

The lower the number of meshes, the greater the application amount of ink, but the disadvantage of intricate printing is inferior. Therefore, it is necessary to use a mesh having a high mesh number for precise printing. The number of prints is preferably one, but when a mesh having a high mesh number is used, one or more print jobs may be performed.

Factors that determine the thickness of the light blocking layer 150 may vary. The thickness of the light blocking layer 150 may vary depending on the application amount of the light blocking material. In the case of silk screen printing, the ink may vary depending on the strength of the skew, a tool for forcing the ink down to the portion to be printed through the screen mesh, and also depending on the tension of the screen mesh. In addition, the printing speed and the type of solvent that dissolves the light-shielding substance may also affect the coating amount of the light-shielding substance.

The thickness of the light blocking layer 150 is preferably 1 micrometer to 500 micrometers, more preferably 10 micrometers to 150 micrometers, and most preferably 20 micrometers to 100 micrometers.

The light blocking layer 150 may be formed by a gravure printing method or a PAD printing method.

The reflective material constituting the reflective layer 190 may be a material including a white, silver, or gold-based pigment or dye that may block or absorb light. Examples of the reflective material may be white ink, silver ink, white paint or silver paint, and the like, and white ink or silver ink is more preferable. A binder, a solvent, a surfactant, etc. other than the white-based or silver-based pigments or dyes constituting the white ink or the silver ink are not particularly limited.

The reflective layer 190 may be formed at a part of the edge of the prism plate 100, but is more preferably formed over the entire edge of the prism plate 100. FIG. 4 shows that the reflective layer 190 is formed between all edges of the prism plate 100. In this case, the reflective layer 190 formed at the edge may be linear having a width. The width of the prism plate 100 refers to the longer of the horizontal or vertical length of the prism plate 100 on which the reflective layer 190 is formed.

The width of the reflective layer 190 to which the reflective layer 190 is applied or printed on the prism plate 100 may vary depending on the width of the prism plate 100, but is 0.5% to 25% of the width of the prism plate 100. Preferably, 2%-15% are more preferable, Most preferably, it has a width of 3%-10%. In addition, the width of the reflective layer 190 is more preferably the same as the width of the light blocking layer 150. This is especially true when the light blocking layer 150 and the reflective layer 190 are simultaneously formed on the same or different surfaces of the prism plate 100.

The thickness of the reflective layer 190 is preferably 1 micrometer to 500 micrometers, more preferably 10 micrometers to 150 micrometers, and most preferably 20 micrometers to 100 micrometers.

The reflective layer 190 formed on the prism plate 100 of the liquid crystal display backlight unit of the present invention may include an adhesive material. The adhesive substance is not particularly limited. When the reflective material and the adhesive material are mixed to form one reflective layer 190, the relative weight ratio of the reflective material and the adhesive material is preferably 20 parts by weight to 500 parts by weight with respect to 100 parts by weight of the reflective material. More preferred is from 250 parts by weight to 250 parts by weight, most preferably from 50 parts by weight to 200 parts by weight.

The adhesive material may be mixed with the reflective material to form one reflective layer 190, and the reflective layer 170, which is composed of only an adhesive component, is formed directly on the prism plate 100 or on the prism plate 100. It may be formed on the outer surface of the 190 or the outer surface of the reflective layer 190.

The adhesive material constituting the adhesive layer 170 is not particularly limited as long as it has adhesiveness. Therefore, it may be an oily adhesive material or an aqueous adhesive material. However, it is necessary to match the properties of the solvent constituting the reflective material in relation to the reflective material, or the properties of the solvent constituting the reflective material in relation to the reflective material. In an embodiment of the present invention, since the white ink is used as the reflective material, and the solvent constituting the white ink may be an aqueous solvent such as water, in this case, it is preferable that the adhesive material is aqueous. If the solvent is oily, it may be more preferable as the oily adhesive material than the aqueous adhesive material. Such an adhesive component may facilitate coupling of the prism plate 100 with other components constituting the backlight unit of the liquid crystal display.

The adhesive layer 170 may be formed on a part of the edge of the prism plate 100, but is more preferably formed over the entire edge of the prism plate 100. FIG. 4 shows that the adhesive layer 170 is formed between all edges of the prism plate 100. In this case, the adhesive layer 170 formed at the edge may have a linear shape. The width of the prism plate 100 refers to the longer of the horizontal or vertical length of the prism plate 100 on which the adhesive layer 170 is formed.

The width of the adhesive layer 150 to which the adhesive layer 170 is applied or printed on the prism plate 100 may vary depending on the width of the prism plate 100, but is preferably 0.5% to 25% of the width of the prism plate 100. 2% to 20% is more preferable, and most preferably 3% to 10% of the width. It is preferable that the width of the adhesive layer matches the width of the light shielding layer or the reflective layer to be applied or printed.

The thickness of the adhesive layer 170 is preferably 1 micrometer to 500 micrometers, more preferably 10 micrometers to 150 micrometers, and most preferably 20 micrometers to 100 micrometers.

The prism plate 100 of the present invention may be used in a backlight unit, and a liquid crystal display device employing the backlight unit may be configured. In particular, the prism plate 100 of the present invention may be formed in a color TFT LCD. It can be better used. The liquid crystal display device may be utilized in various electronic products. Examples of the electronic product may include portable wired and wireless telephones, monitors, notebook computers, PDAs, digital TVs, and the like. Application examples are not limited to the above examples, and those skilled in the art will be able to utilize the liquid crystal display device of the present invention in more electronic products.

The prism plate on which the light shielding layer of the present invention is formed has a light shielding effect as compared to a conventional prism plate. The light shielding layer of the present invention formed by the printing method can be easily formed as compared with other light shielding means, has high mass productivity, reduces production cost, and improves production speed.

The prism plate on which the reflective layer of the present invention is formed has a reflection effect as compared to the conventional prism plate. The light shielding layer of the invention designed by the printing method can be easily formed as compared with other light shielding means, has high mass productivity, reduces production costs, and improves production speed.

In addition, when the light blocking layer and the reflective layer are simultaneously on one prism plate, there is an advantage that the light blocking effect and the reflection effect are simultaneously.

The backlight unit provided with the prism plate of the present invention, the liquid crystal display device provided with the backlight unit, and the electronic product provided with the liquid crystal display device have high light blocking effect and reflection effect, and thus high quality image can be expressed. The cost of production can be lowered.

Claims (28)

In the prism plate which comprises the backlight unit of a liquid crystal display device, A prism plate of the backlight unit, wherein the prism plate is formed by printing and includes a light blocking layer including a light blocking material that blocks light. The method of claim 1, The light blocking layer is formed on at least a portion of the edge of the prism plate prism plate of the backlight unit. The method of claim 2, The light blocking layer is a prism plate of the backlight unit, characterized in that formed over the entire section of the edge of the prism plate. The method of claim 1, The light blocking material is a black ink, the prism plate of the backlight unit. The method of claim 1, The light blocking layer is formed on at least one surface of the prism plate, the prism plate of the backlight unit. The method of claim 1, The thickness of the light blocking layer is a prism plate of the backlight unit, characterized in that 10 to 150 micrometers. The method of claim 1, The light blocking layer further includes an adhesive material together with the light blocking material. The method of claim 1, The prism plate of the backlight unit is formed on the outer surface of the light shielding layer, further comprising an adhesive layer containing an adhesive material. The method of claim 8, The adhesive material is oil-based prism plate, characterized in that. The method of claim 8, The adhesive material is a prism plate of the backlight unit, characterized in that the aqueous. The method of claim 1, The width of the light blocking layer is a prism plate of the backlight unit, characterized in that 2% to 20% of the width of the prism plate. The method of claim 1, The printing is a prism plate of the backlight unit, characterized in that the printing of silk screen printing. The method of claim 1, The printing is a prism plate of the backlight unit, characterized in that the printing of the gravure printing method. The method of claim 8, The adhesive layer is a prism plate of the backlight unit, characterized in that formed by the silk screen printing method. The method of claim 1, And a reflective layer formed on at least one surface of the prism plate, the reflective layer including a reflective material reflecting light. The method of claim 15, And the reflecting layer is formed on the same side as the light shielding layer forming surface of the prism plate. The method of claim 16, The reflective layer is a prism plate of the backlight unit, characterized in that disposed on the outer surface of the light shielding layer of the prism plate. The method of claim 16, The light blocking layer is disposed on an outer surface of the reflective layer of the prism plate, the prism plate of the backlight unit. The method of claim 15, The reflective layer is formed on the rear surface of the light shielding layer forming surface, the prism plate of the backlight unit. The method of claim 15, The reflective material forming the reflective layer comprises a white ink and / or a silver ink. The method of claim 15, The reflective layer is formed by a silk screen printing method, the prism plate of the backlight unit. The method of claim 15, The reflective layer further includes an adhesive material together with the reflective material. The method of claim 15, The prism plate of the backlight unit is formed on the outer surface of the reflective layer, further comprising an adhesive layer containing an adhesive material. The method according to any one of claims 1 to 23, The prism plate of the backlight unit further comprises a release layer attached to at least one outer surface of the prism plate. 24. A backlight unit comprising at least one of the prism plates of any one of claims 1 to 23. A liquid crystal display device comprising the backlight unit of claim 25. A portable telephone comprising the liquid crystal display device according to claim 26. An electronic product comprising the liquid crystal display device according to claim 26.