KR101158905B1 - Light control palate and back light assembly having the same - Google Patents

Abstract

Disclosed are a light adjusting plate and a backlight assembly having the same for improving assembly quality and at the same time improving display quality. The light adjusting plate includes a light adjusting layer and an optical property improving layer. The light control layer has a foam layer, and controls light provided from the outside, and the light property improving layer is integrally formed on the light control layer and improves the optical properties of the light provided from the light control layer. Therefore, as the optical property improving layer is integrally formed on the light adjusting layer having the foam layer, the handleability is improved and the assemblability is improved, and the light is scattered by the foam layer to increase the brightness.

Description

LIGHT CONTROL PALATE AND BACK LIGHT ASSEMBLY HAVING THE SAME}

1 is an exploded perspective view showing a backlight assembly according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line II ′ of FIG. 1.

3 is a cross-sectional view illustrating in detail the diffusion plate illustrated in FIG. 1.

4 is a schematic view of an apparatus for forming the diffusion plate shown in FIG. 1.

5 is a cross-sectional view illustrating in detail the optical characteristic improving member illustrated in FIG. 1.

6 is a cross-sectional view showing in detail the adhesive layer shown in FIG.

7 is a graph showing the amount of change in relative luminance according to the interlayer refractive index.

8A is a view showing a change in luminance distribution when there is no air layer between the diffusion plate and the optical property improving member.

8B is a view showing a change in luminance distribution when there is an air layer between the diffusion plate and the optical property improving member.

9 is an exploded perspective view illustrating a backlight assembly according to another embodiment of the present invention.                 

FIG. 10 is a cross-sectional view illustrating in detail the light guide plate and the optical property improving member illustrated in FIG. 9.

11 is an exploded perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

12 is an exploded perspective view illustrating a liquid crystal display according to another exemplary embodiment of the present invention.

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

100: lamp unit 200: light adjusting member

210: first foam layer 220: diffusion layer

230: second foam layer 250: optical properties improving member

260: adhesive layer 300: reflector

400: storage container 500: backlight assembly

The present invention relates to a light control plate and a backlight assembly having the same, and more particularly, to a light control plate and a backlight assembly having the same for improving assembly quality and at the same time improving display quality.

Recently, a display device for displaying an image has been rapidly developed according to its use and type, and a liquid crystal display device excellent in performance and function among various kinds of display devices is widely used.

The liquid crystal display is one of the most widely used flat panel display devices. The liquid crystal display panel (hereinafter, referred to as an LCD panel) includes two substrates on which electrodes are formed and a liquid crystal layer injected therebetween. ). Accordingly, the liquid crystal display displays an image by controlling the amount of light transmitted by applying a voltage to the electrodes of the liquid crystal display panel to rearrange the liquid crystal molecules of the liquid crystal layer.

Since the liquid crystal display displays an image using an LCD panel that controls the amount of light coming from the outside, in order to form the image on the LCD panel, a separate light source for irradiating light to the LCD panel, that is, a backlight Assembly is required.

The backlight assembly may include a reflection sheet, a diffusion plate, and a plurality of optical sheets, which are sequentially stacked in a storage container and transmit light to the LCD panel, and a lamp assembly configured to generate the light under the diffusion plate. In this case, the optical sheets include a diffusion sheet, a prism sheet, and a reflective polarizing sheet having a thin film structure.

Here, as the size of the plurality of optical sheets on the diffuser plate increases, there is a problem in that the assembly process of the optically exposed sheets having a thin film structure becomes more and more difficult.

Accordingly, an object of the present invention is to provide a light control plate in which an optical sheet is integrally formed on a diffusion plate or a light guide plate.

Another object of the present invention to provide a backlight assembly having the light control plate.

Another object of the present invention is to provide a display device having the above-described backlight assembly.

Light control plate according to the present invention for achieving the above object includes a light control layer and an optical characteristic enhancement layer. The light control layer has a foam layer, and controls the light provided from the outside, the light property improving layer is integrally formed on the light control layer, to improve the optical properties of the light provided from the light control layer.

The light control layer has a first plurality of air bubbles randomly distributed, the first foam layer to first scatter the light provided from the outside by the first plurality of air bubbles, on the first foam layer A diffusion layer formed on the diffusion layer, the diffusion layer for diffusing light provided from the first foam layer, and a second plurality of air bubbles formed on the diffusion layer and randomly distributed from the diffusion layer by the second plurality of air bubbles. And a second foam layer that secondary scatters light.

In addition, the light control layer includes a light guide layer for controlling the path of the light and the foam layer formed on the light guide layer and having a plurality of randomly distributed air bubbles.                     

The lamp of the backlight assembly for achieving another object of the present invention generates light, the light control plate has a foam layer, and adjusts the light provided from the lamp, the optical properties improving member integrally on the light control member It is formed, and improves the characteristics of the light provided from the light adjusting member.

A display device for achieving another object of the present invention includes a display unit for displaying an image, a lamp for generating light for displaying the image, a light emitting layer, and a light adjusting plate for adjusting the light provided from the lamp and the And a backlight assembly integrally formed on the light adjusting plate and having a light characteristic improving member for improving the properties of the light provided from the light adjusting plate.

According to the light control plate and the backlight assembly having the same, as the optical property improving layer is integrally formed on the diffusion layer or the light guide layer having the foam layer, the handleability is improved to improve the assemblability and at the same time the light is emitted by the foam layer. Scattering can increase the brightness.

Hereinafter, a backlight assembly according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exploded perspective view illustrating a backlight assembly according to an exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II ′ of FIG. 1.

As shown in FIG. 1 and FIG. 2, the backlight assembly 500 according to the exemplary embodiment of the present invention may include a lamp unit 100, a light adjusting plate 200, an optical characteristic improving member 250, and a reflecting plate 300. And a storage container 400.                     

The lamp unit 100 includes a plurality of lamps 110 arranged in parallel to generate light and a lamp holder 120 for fixing both ends of the lamps 110. The lamps 110 are formed of a cold cathode fluorescent lamp (CCFL) having a rod shape. Hot electrodes (not shown) for applying a high voltage and cold electrodes (not shown) for providing a low voltage are respectively connected to both ends of the lamps 110. The lamp holder 120 is installed to cover hot and cold electrodes of the lamps 110, respectively.

The light control plate 200 is formed on the lamp unit 100 to diffuse the light provided from the lamp unit 100. Hereinafter, the light control plate 200 is referred to as a diffusion plate. Here, the diffusion plate 200 has a multilayer structure. That is, the diffusion plate 200 includes a first foam layer 210, a diffusion layer 220 and a second foam layer 230.

3 is a cross-sectional view illustrating in detail the diffusion plate illustrated in FIG. 1.

Referring to FIG. 3, the diffusion plate 200 is formed on the first foam layer 210 and the first foam layer 210 that primarily scatter light generated by the lamps 110, and the first foam. The diffusion layer 220 diffuses the light scattered first by the layer 210 and the second foam layer 230 formed on the diffusion layer 220 and secondary scatters the light diffused by the diffusion layer 220. Include.

The diffusion layer 220 is made of an acrylic resin and a diffusion agent. In this case, the acrylic resin is a methyl methacrylate (MMA) monomer (Monomer) is a polymethyl methacrylate (polymethylmethacrylate; PMMA) as a main raw material.

In addition, the first foam layer 210 is randomly distributed in the first mixture 212 and the first mixture 212, the plurality of first air bubbles 214 having a maximum first diameter (d1). Include. The air bubbles 214 include air therein, and the first diameter d1 is about 50 μm or less.

The first mixture 212 is formed by mixing an antistatic agent and an acrylic resin. In addition, the first air bubbles 214 are formed by a blowing agent. The blowing agent vaporizes above a predetermined temperature to generate gas, thereby forming air bubbles having air therein. Therefore, the first foam layer 210 is formed by mixing the antistatic agent, the acrylic resin and the foaming agent.

Here, the antistatic agent prevents static electricity with a protective film (not shown) attached to the upper and lower surfaces to protect the diffusion plate 200.

The second foam layer 230 is randomly distributed in the second mixture 232 and the second mixture 232, the plurality of second air bubbles 234 having the same diameter as the first air bubbles 214. ). The second mixture 232 is formed by mixing an antistatic agent and an acrylic resin. In addition, the second air bubbles 234 are formed by the blowing agent. Therefore, the second foam layer 230 is formed by mixing the antistatic agent, the acrylic resin and the foaming agent.

The first and second foam layers 210 and 230 having the above configuration scatter the light provided from the lamps 110 by the first and second air bubbles 214 and 234.

Therefore, the diffusion plate 200 not only diffuses the light by the diffusion agent of the diffusion layer 220 but also the lamp by the first and second air bubbles 214 and 234 of the first and second foam layers 210 and 230. As the light incident from the unit 100 is scattered, luminance may be improved as compared with the conventional art. As a result, even if the amount of the diffusion agent mixed in the diffusion layer 220 of the diffusion plate 200 is reduced, the same brightness as the conventional one may be obtained by the first and second foam layers 210 and 230.

Meanwhile, the thickness of the diffusion plate 200 may be reduced by optimizing the diameters of the first and second air bubbles 214 and 234 of the first and second foam layers 210 and 230.

For example, reducing the diameter of the first and second air bubbles 214 and 234 increases the number of first and second air bubbles 214 and 234. When the number of the first and second air bubbles 214 and 234 increases, the amount of scattering of light increases, so that the brightness is improved. Therefore, in order to obtain a predetermined brightness, the thickness of the diffusion plate 200 having the first and second foam layers 210 and 230 is relatively reduced compared to the case where the first and second foam layers 210 and 230 are not provided.

The diffusion plate 200 having the above configuration is formed by an injection molding or extrusion molding method.

4 is a schematic view of an apparatus for forming the diffusion plate shown in FIG. 1.

Referring to FIG. 4, the diffusion plate forming apparatus 600 includes a main body 610, a first inlet 620, a second inlet 630, and an outlet 640. The diffusion plate forming apparatus 600 is an extruder that forms a diffusion plate having a predetermined shape by applying pressure to a material to be injected.

A mixture of an acrylic resin and a diffusion agent for forming the diffusion layer 220 of the diffusion plate 200 through the first injection hole 620 is supplied into the main body 610, and the diffusion plate (through the second injection hole 630). A mixture of an acrylic resin, an antistatic agent and a blowing agent for forming the first and second foam layers 210 and 230 of 600 is supplied into the main body 610.

The main body 610 has an internal structure for forming a diffusion plate 200 of a predetermined shape, for example, a flat shape. Also, the first injection hole 620 is formed at the input end side of the main body 610, and the second injection hole 630 is formed at the output end side of the main body 610 adjacent to the discharge port 640.

A diffusion plate manufacturing process by the diffusion plate forming apparatus having the above configuration is as follows.

First, the mixture in which an acrylic resin and a diffusion agent are mixed through the first injection hole 620 is injected into the main body 610 to form a diffusion layer 220.

Subsequently, the mixture of the acrylic resin, the antistatic agent, and the foaming agent is injected into the main body 610 through the second injection hole 630, and then adhered to the upper and lower surfaces of the diffusion layer 220 to form the first and second foams. Layers 210 and 230 are formed, respectively. In this case, the mixture injected through the second injection hole 630 is distributed by a splitter (not shown) formed in the main body 610. Therefore, the first and second foam layers 210 and 230 are formed as the mixture is adhered to the upper and lower surfaces of the diffusion layer 220, respectively.

Through the above process, the diffusion plate 200 including the diffusion layer 220 and the first and second foam layers 210 and 230 is discharged to the outside through the discharge port 640. At this time, since the diffusion plate 200 is in a high temperature state, the manufacture of the diffusion plate 200 is completed as the cooling process is performed.

Referring back to FIGS. 1 and 2, the optical characteristic improving member 250 has a thin film shape and is integrally formed by being laminated on the diffusion plate 200. In addition, the optical characteristic improving member 250 has a reflective polarization function and a light condensing function.

5 is a cross-sectional view illustrating in detail the optical characteristic improving member illustrated in FIG. 1.

Referring to FIG. 5, the optical characteristic improving member 250 includes a reflective polarizing sheet 252 and a light collecting sheet 254. At this time, the reflective polarizing sheet 252 and the light collecting sheet 254 are integrally formed with each other. The reflective polarizing sheet 252 is a Double Brightness Enhancement Film (DBEF), and the light collecting sheet 254 is a Round Brightness Enhancement Film (RBEF).

Here, the reflective polarizing sheet 252 is composed of a first base film 252a formed of polycarbonate (PC) and a reflective polarization film 252b formed on the first base film 252a. In addition, the light collecting sheet 254 is integrally formed on the reflective polarizing film 252b, is formed on the second base film 254a and the second base film 254a made of PC, and forms a round prism acid. And a plurality of prisms 254b having. At this time, the prisms 254b are formed by coating an acrylic resin.

The reflective polarizing sheet 252 having the above-described configuration reflects and polarizes light incident from the diffuser plate 220, and the light collecting sheet 254 collects light incident from the reflective polarizing sheet 252 in front. Exit after condensing.

1 and 2, an adhesive layer 260 is formed between the diffusion plate 200 and the optical characteristic improving member 250. The adhesive layer 260 laminates the optical property improving member 250 on the diffusion plate 200.                     

6 is a cross-sectional view showing in detail the adhesive layer shown in FIG.

Referring to FIG. 6, an adhesive layer 260 is formed between the diffusion plate 200 and the optical property improving member 250 to integrate the optical property improving member 250 on the diffusion plate 200.

The adhesive layer 260 includes an adhesive agent 262 and a plurality of third air bubbles 264 randomly distributed in the adhesive 262. The third air bubbles 264 are formed by a blowing agent. That is, the adhesive layer 260 is formed of a mixture of the adhesive 262 and the blowing agent. In this case, the third air bubbles 264 have a second diameter d2 smaller than the first diameter d1 of the first and second air bubbles 214 and 234.

The adhesive 262 integrates the optical property improving member 250 on the diffusion plate 200. In addition, the third air bubbles 264 scatter light incident from the diffuser plate 200. Accordingly, the adhesive layer 260 not only integrates the diffusion plate 200 and the optical property improving sheet 250, but also scatters light to improve luminance. For this reason, a separate diffusion sheet for diffusing the light provided from the diffusion plate 200 is unnecessary.

As described above, as the optical property improving member 250 is integrally formed on the diffusion plate 200 by the adhesive layer 260, the handleability is improved, thereby simplifying the assembly process and reducing the manufacturing cost. . In addition, it is possible to eliminate the air layer existing between the diffusion plate 200 and the optical characteristic improving member 250, thereby reducing the reflection of the light by the air layer, it is possible to increase the transmittance.

In general, as the interlayer refractive index between each component in the backlight assembly approaches 1, the maximum luminance may be obtained.                     

7 is a graph showing the amount of change in relative luminance according to the interlayer refractive index.

As shown in FIG. 7, the relative luminance increases as the interlayer refractive index approaches 1, and the relative luminance decreases as the refractive index exceeds 1. Here, the air layer has a refractive index of one.

Therefore, when the diffuser plate and the optical characteristic improving member are integrally formed without any configuration, there is no air layer between the diffuser plate and the optical characteristic improving member. For this reason, since the interlayer refractive index between the said diffusion plate and an optical characteristic improving member becomes larger than 1, a relative luminance decreases.

However, the diffusion plate 200 according to the present invention includes first and second foam layers 210 and 230 having first and second air bubbles 214 and 234. In addition, the adhesive layer 260 that adheres the optical property improving member 250 to the diffusion plate 200 also includes third air bubbles 264. In this case, the first to third air bubbles 214, 234, and 264 include air therein.

Therefore, in the backlight assembly 500 according to the present invention, air is trapped between the diffuser plate 200 and the optical characteristic improving member 250 by the first to third air bubbles 214, 234, and 264. Can be. Therefore, as the interlayer refractive index between the diffuser plate 200 and the optical characteristic improving member 250 approaches 1, the backlight assembly 500 has a high relative luminance.

FIG. 8A is a view showing a change in luminance distribution when there is no air layer between the diffusion plate and the optical property improving member, and FIG. 8B is a view showing a change in luminance distribution when there is an air layer between the diffusion plate and the optical property improving member. . In this case, the optical characteristic improving member is a light collecting sheet.

Referring to FIG. 8A, when the diffusion plate and the light collecting sheet are integrally formed by the adhesive, no air layer exists between the diffusion plate and the light collecting sheet. At this time, the maximum luminance measured on the light collecting sheet at the front, that is, the viewing angle of 0 degrees, is about 5100 nits.

On the other hand, when an air layer is formed between the diffusion plate and the light collecting sheet as shown in FIG. 8B, the maximum luminance measured on the light collecting sheet at a viewing angle of 0 degrees is about 8164 nits.

As such, when the air layer is formed between the diffusion plate and the light collecting sheet, the maximum luminance is relatively higher than when the air layer does not exist. In addition, the light condensing function by the light condensing sheet is also improved, and light is concentrated in the center of the light condensing sheet.

Accordingly, in the backlight assembly according to the present invention, the maximum luminance is increased by the first to third air bubbles 214, 234, and 264, and the light condensing function by the optical characteristic improving member 250 is also improved.

Referring back to FIGS. 1 and 2, the reflector 300 is formed under the lamp unit 100, and reflects the light leaking from the lamp unit 100 to be emitted to the diffuser plate 200.

In addition, the storage container 400 is formed under the reflective plate 300, and consists of a bottom portion and a side portion extending from the end of the bottom portion to form a storage space. The optical characteristic improving member 250, the diffusion plate 200, and the lamp unit 100 are sequentially received in the accommodation space.

9 is an exploded perspective view illustrating a backlight assembly according to another embodiment of the present invention.                     

9, the backlight assembly 1200 according to another embodiment of the present invention may include a lamp unit 800, a light adjusting plate 900, an optical characteristic improving member 950, a reflecting plate 1000, and a storage container 1100. ).

The lamp unit 800 protects at least one or more lamps 810 and lamps 810 that generate light, and lamp covers 820 for reflecting the light generated from the lamps 810 toward the light control plate 900. It includes. At this time, the lamp unit 800 is accommodated in one side of the storage container 1100 to correspond to one side of the light control plate 900 to which the light is incident.

Here, the lamp 810 is composed of a cold cathode fluorescent lamp (CCFL) having a rod shape. Hot electrodes (not shown) for applying a high voltage and cold electrodes (not shown) for providing a low voltage are respectively connected to both ends of the lamp 810, and the lamps 810 are positioned at these connection portions. Lamp holders 830 for giving, respectively, are provided.

In addition, the lamp cover 820 is made of a material having a high reflectance or has a structure in which a reflective member is coated on a cover surface covering the lamp 810, and the light generated from the lamp 810 is controlled by the light control plate 900. Reflected to the side to improve the use efficiency of light.

The light control plate 900 is formed on one side of the lamp unit 800, and guides the light provided from the lamp unit 800 to emit. Hereinafter, the light control plate 900 will be referred to as a light guide plate. Here, the light guide plate 900 has a multilayer structure.

FIG. 10 is a cross-sectional view illustrating in detail the light guide plate and the optical property improving member illustrated in FIG. 9.

Referring to FIG. 10, the light guide plate 900 includes a light guide layer 910 and a foam layer 920 formed on the light guide layer 910.

Here, the light guide layer 910 is made of an acrylic resin and a diffusion agent. In addition, a reflection pattern (not shown) is formed on a lower surface of the light guide layer 910 to reflect light incident from the lamp unit 800 and to emit the light upward.

The foam layer 920 includes a mixture 922 and a plurality of first air bubbles 924 having a first diameter d1 distributed randomly in the mixture 922. The first air bubbles 924 include air therein, and the first diameter d1 is about 50 μm or less.

 The mixture 922 is formed by mixing an acrylic resin and an antistatic agent, and the first air bubbles 924 are formed by a blowing agent. In this case, the blowing agent vaporizes above a predetermined temperature to generate gas to form first air bubbles 924. Thus, the foam layer 920 is formed by the acrylic resin, the antistatic agent and the foaming agent.

The light guide plate 900 having the above configuration adjusts a path of light that reflects and emits the light by the reflection pattern formed on the lower surface of the light guide layer 910, and diffuses the light by the diffusion agent. In addition, the light guide plate 900 scatters the light by the first air bubbles 924 in the foam layer 920.

Accordingly, the light guide plate 900 diffuses the light by the diffusing agent of the light guide layer 910, and the light diffused by the diffusing agent into the first air bubbles 924 of the foam layer 920. By scattering again can improve the brightness compared to the conventional. Therefore, even if the amount of the diffusion agent mixed in the light guide layer 910 of the light guide plate 900 is reduced, the same brightness as the conventional one can be obtained by the foam layer 920.

Meanwhile, the thickness of the light guide plate 900 may be reduced by optimizing the diameters of the first air bubbles 924 of the foam layer 920. That is, reducing the diameter of the first air bubbles 924 increases the number of the first air bubbles 924. When the number of the first air bubbles 924 increases, the amount of scattering of light increases, so that the brightness is improved. For this reason, when the desired brightness is to be obtained, the light guide plate 900 having the foam layer 920 is relatively thinner than the case where the foam layer 920 is not provided.

The optical characteristic improving member 950 includes a reflective polarizing sheet 952 and a light collecting sheet 954. Here, the reflective polarizing sheet 952 and the light collecting sheet 954 are the same as the reflective polarizing sheet 252 and the light collecting sheet 254 according to an embodiment of the present invention, a detailed description thereof will be omitted.

Referring to FIG. 9 again, an adhesive layer 960 is formed between the optical characteristic improving member 950 and the light guide plate 900. The adhesive layer 960 is integrated by laminating the optical property improving member 950 on the light guide plate 900.

As illustrated in FIG. 10, the adhesive layer 960 includes an adhesive 962 and a plurality of second air bubbles 964 randomly distributed in the adhesive 962. The adhesive layer 960 is formed of an adhesive 962 and a blowing agent, and second air bubbles 964 are formed by the blowing agent. At this time, the second air bubbles 964 have a second diameter d2. The second diameter d2 is smaller than the first diameter d1 of the first air bubbles 924.

The adhesive layer 960 not only integrates the light guide plate 900 and the optical property improving member 950, but also scatters light to improve luminance. For this reason, a separate diffusion sheet for diffusing the light onto the light guide plate 900 is unnecessary.

In addition, even when the light guide plate 900 and the optical property improving member 950 are integrally formed by the adhesive layer 960, the adhesive layer 960 has a refractive index close to one. That is, an effect of forming an air layer between the light guide plate 900 and the optical property improving member 950 by the first air bubbles 924 in the foam layer 920 and the second air bubbles 964 in the adhesive layer 960. Has Therefore, since the interlayer refractive index between the light guide plate 900 and the optical characteristic improving member 950 approaches 1, it has the maximum relative luminance.

Referring to FIG. 9 again, the reflective plate 1000 is formed under the light guide plate 900, and reflects the light leaked from the light guide plate 900 to be emitted to the light guide plate 900.

In addition, the storage container 1100 is formed under the reflective plate 1000, and includes a bottom portion and a side portion extending from an end portion of the bottom portion to form a storage space. The optical characteristic improving member 950, the light guide plate 900, and the lamp unit 800 are accommodated in the accommodation space.

11 is an exploded perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention. In the present embodiment, since the backlight assembly has the same configuration as that shown in FIGS. 1 to 6, the same reference numerals are used for the same configuration, and detailed description thereof will be omitted.

Referring to FIG. 11, a liquid crystal display 1500 according to an exemplary embodiment of the present invention may include a backlight assembly 500 for supplying light and a display for displaying an image using light supplied from the backlight assembly 500. A top chassis 1400 for fixing the unit 1300 and the display unit 1300 to the backlight assembly 500.

The backlight assembly 500 is integrated in the lamp unit 100 generating the light, the diffuser plate 200 and the diffuser plate 200 which are formed on the lamp unit 100 to diffuse the light generated from the lamp unit 100. It is formed to include an optical characteristic improving member 250 to improve the optical characteristics of the diffused light. In addition, the backlight assembly 500 is formed under the lamp unit 100 to reflect the light leaked from the lamp unit 100 toward the display unit 1300, and is formed under the reflector plate 300 and the reflector plate 300. 100, a storage container 400 for sequentially receiving the diffusion plate 200 and the optical characteristic improving member 250.

Here, the diffusion plate 200 includes a first foam layer 210, a diffusion layer 220 and the second foam layer 230. The optical property improving member 250 is laminated on the diffusion plate 200 by an adhesive layer 260 having a plurality of air bubbles.

Therefore, as the diffuser plate 200 and the optical characteristic improving member 250 are integrally formed, the assemblability is improved. In addition, as a result of forming an air layer between the diffusion plate 200 and the optical characteristic improving member 250 by the first and second foam layers 210 and 230, the luminance may be prevented from being lowered.

The display unit 1300 may include a liquid crystal display panel 1310 for displaying an image, a source printed circuit board 1320 and a gate printed circuit board 1330 for providing a driving signal for driving the liquid crystal display panel 1310. Include.

The driving signals provided from the source printed circuit board 1320 and the gate printed circuit board 1330 are applied to the liquid crystal display panel 1310 through the data flexible circuit film 1330 and the gate flexible circuit film 1340. The data and gate flexible circuit films 1330 and 1340 may include, for example, a tape carrier package (TCP) or a chip on film (COF). Here, each of the data and gate flexible circuit films 1330 and 1340 is driven to apply driving signals provided from the source printed circuit board 1320 and the gate printed circuit board 1330 to the liquid crystal display panel 810 at an appropriate timing. A data driving chip 1360 and a gate driving chip 1370 for controlling the timing of the signal are further included.

The liquid crystal display panel 1310 includes a thin film transistor (TFT) substrate 1312, a color filter substrate 1314 coupled to face the TFT substrate 1312, and the two substrates 1312. A liquid crystal (not shown) interposed between 1314.

The TFT substrate 1312 is a transparent glass substrate on which a switching element TFT (not shown) is formed in a matrix form. A data line is connected to a source terminal of the TFTs, and a gate line is connected to a gate terminal. In addition, a pixel electrode made of a transparent conductive material is connected to the drain terminal.

The color filter substrate 1314 is disposed to face the TFT substrate 1312 at regular intervals. The color filter substrate 1314 is a substrate in which RGB pixels, which are color pixels that are expressed in a predetermined color when light passes, are formed by a thin film process. A common electrode made of a transparent conductive material is formed on the front surface of the color filter substrate 814.

In the liquid crystal display panel 1310 having such a configuration, when power is applied to the gate terminal of the TFT and the TFT is turned on, an electric field is formed between the pixel electrode and the common electrode. Such an electric field changes the arrangement of the liquid crystal interposed between the TFT substrate 1312 and the color filter substrate 1314, and changes the transmittance of the light supplied from the backlight assembly 500 in accordance with the change in the arrangement of the liquid crystal so that desired gray scale is achieved. You will get a video of.

The source printed circuit board 1320 is connected to one end of the TFT substrate 1312 through the data flexible circuit film 1340. In addition, the gate printed circuit board 1330 is connected to the other end of the TFT substrate 1312 through the gate flexible circuit film 1350. Accordingly, the source printed circuit board 1320 and the gate printed circuit board 1330 generate and output a data driving signal and a gate driving signal for driving the liquid crystal display panel 1310.

The data driving signal is a driving signal for controlling the data line formed on the TFT substrate 1312 and is applied to the data line through the data flexible circuit film 1340. The gate driving signal is a driving signal for controlling the gate line formed on the TFT substrate 1312 and is applied to the gate line via the gate flexible circuit film 1350. To this end, a conductive wiring (not shown) for connecting the data flexible circuit film 1340 and the gate flexible circuit film 1350 is formed on the TFT substrate 1312.

Meanwhile, the display unit 1300 is mounted from the top of the backlight assembly 500. In this case, the liquid crystal display panel 1310 is accommodated in the upper mold frame 1450 and disposed on the backlight assembly 500. In addition, the source printed circuit board 1320 is fixed to the rear surface of the storage container 400 by bending the data flexible circuit film 1340.

The top chassis 1400 is coupled to the storage container 400 while surrounding the edge of the liquid crystal display panel 1310 accommodated in the backlight assembly 500. The top chassis 1400 prevents the liquid crystal display panel 1310 from being damaged by an external impact, and prevents the liquid crystal display panel 1310 from being separated from the storage container 400.

12 is an exploded perspective view illustrating a liquid crystal display according to another exemplary embodiment of the present invention. In the present embodiment, since the backlight assembly has the same configuration as that shown in FIGS. 9 and 10, the same reference numerals are used for the same configuration, and detailed description thereof will be omitted.

Referring to FIG. 12, a liquid crystal display 1600 according to another exemplary embodiment of the present invention may include a backlight assembly 1200 for supplying light and a display for displaying an image using light supplied from the backlight assembly 1200. The unit 1300 includes a top chassis 1400 for fixing the display unit 1300 to the backlight assembly 1200.

The backlight assembly 1200 is formed on the lamp unit 800 that generates light and the lamp unit 800 to adjust the path of the light provided from the lamp unit 800 to the light guide plate 900 that exits to the display unit 1300. And an optical property improving member 950 integrally formed with the light guide plate 900 to improve optical characteristics of light provided from the light guide plate 900.

In addition, the backlight assembly 1200 is formed under the lamp unit 800 to reflect the light leaked from the lamp unit 800 to the display unit 1300, and formed under the reflector plate 1000 and the reflector plate 1000. And a storage container 1100 for sequentially receiving the light guide plate 900 and the optical property improving member 950.

The lamp unit 800 is formed on one side of the light guide plate 900 to generate the light. In addition, the light guide plate 900 includes a light guide layer 910 and a foam layer 920. The optical property improving member 950 is laminated on the light guide plate 900 by an adhesive layer 960 having a plurality of air bubbles.

Therefore, as the light guide plate 900 and the light characteristic improving member 950 are integrally formed, the assemblability is improved. In addition, the effect of forming an air layer between the light guide plate 900 and the optical characteristic improving member 950 by the foam layer 920 can be obtained, it is possible to prevent the luminance is lowered.

On the other hand, since the display unit 1300 has the same configuration as in FIG. 11, the same reference numerals will be given, and detailed description thereof will be omitted.

In the embodiments of the present invention, the liquid crystal display device is described as an example, but the present invention may be applied to other display devices having a diffusion plate and a light guide plate for diffusing light.

According to such a backlight assembly and a display device having the same, an optical characteristic improving member is integrally formed on a diffusion plate or a light guide plate that diffuses or adjusts a path incident from the lamp unit. In this case, the diffusion plate and the light guide plate include a foam layer having a plurality of air bubbles. In addition, the adhesive layer for laminating the optical property improving sheet on the diffusion plate or the light guide plate also includes a plurality of air bubbles.                     

Therefore, the present invention has an effect of improving the handleability and assemblability as the optical property improving member is integrally formed on the diffusion plate or the light guide plate.

In addition, even if the diffuser plate or the light guide plate and the optical property improving member are integrally formed, the interlayer refractive index between the diffuser plate or the light guide plate and the optical property improving member approaches 1 due to the air bubbles, so that the luminance is prevented from being lowered and the display quality is improved. Is improved.

In addition, according to the present invention, as the light is scattered by the air bubbles in the foam layer and the brightness is improved, the proportion of the diffusion agent mixed in the diffusion plate or the light guide plate may be relatively reduced, thereby reducing manufacturing costs.

Although the present invention has been described with reference to the embodiments, those skilled in the art may variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. You will understand.

Claims (22)

Light having a first foam layer in which a plurality of first air bubbles are randomly distributed therein and a second foam layer in which a plurality of second air bubbles are randomly distributed therein, and controlling light provided from the outside Control layer; An optical property improving layer integrally formed on the light adjusting layer, and improving an optical property of light provided from the light adjusting layer; And An adhesive layer formed between the light adjusting layer and the light improving layer to laminate the light improving layer on the light adjusting layer, and a plurality of third air bubbles randomly distributed therein; And the diameter of the third air bubbles is smaller than the diameter of the first and second air bubbles. According to claim 1, wherein the light control layer is formed on the first foam layer, and further comprises a diffusion layer for diffusing light provided from the first foam layer, Wherein the first foam layer first scatters light provided from the outside by the plurality of first air bubbles, and the second foam layer is formed on the diffusion layer and receives the light provided from the diffusion layer. Light control plate, characterized in that the secondary scattering. The light regulating plate of claim 1, wherein the first and second air bubbles have a diameter of 50 μm or less. The light regulating plate according to claim 1, wherein the first and second foam layers comprise an acrylic resin, an antistatic agent and a foaming agent. The light adjusting plate of claim 1, wherein the light adjusting layer further includes a light guide layer that controls a path of light provided from the outside. The optical property improving layer of claim 1, wherein A reflective polarizing sheet for reflecting and polarizing light provided from the light adjusting layer; And And a prism sheet integrally formed on the reflective polarizing sheet. The method of claim 6, wherein the prism sheet is Base film; And And a plurality of prisms formed on the base film, wherein round prism acids are formed adjacent to each other. delete delete A lamp for generating light; And Scatters light provided from the lamp, and has a first foam layer in which a plurality of first air bubbles randomly distributed therein and a second foam layer in which a plurality of second air bubbles randomly distributed therein are formed; A light adjusting plate for adjusting light provided from the lamp; An optical property improving member integrally formed on the light control plate and improving the property of light provided from the light control plate; And And an adhesive member formed between the light adjusting plate and the light improving member to laminate the light improving member on the light adjusting plate, and having a plurality of third air bubbles randomly distributed therein. And the diameter of the third air bubbles is smaller than the diameter of the first and second air bubbles. The method of claim 10, wherein the light control plate is formed on the first foam layer, and comprises a diffusion layer for diffusing light provided from the first foam layer, The first foam layer first scatters light provided from the lamp by the plurality of first air bubbles, and the second foam layer is formed on the diffusion layer, and by the plurality of second air bubbles And backscatter the light provided from the diffusion layer. The method of claim 10, wherein the light control plate And a light guide layer formed on the lamp and controlling a path of light provided from the lamp. delete delete A lamp for generating light; A first foam layer comprising a plurality of randomly distributed first air bubbles, the first foam layer which first scatters light provided from the lamp, integrally formed on the first foam layer, and diffusing the first scattered light A light control plate integrally formed on the diffusion layer, the light control plate including a plurality of second air bubbles, and a second foam layer secondaryly scattering light diffused in the diffusion layer; An optical property improving member integrally formed on the second foam layer and improving characteristics of the secondary scattered light; And An adhesive member formed between the light control plate and the optical characteristic improving member to laminate the optical characteristic improving member on the second foam layer and having a plurality of third air bubbles randomly distributed therein; And the diameter of the third air bubbles is smaller than the diameter of the first and second air bubbles. delete delete A lamp for generating light; A light guide layer formed on one side of the lamp to adjust a path of light provided from the lamp; A foam layer integrally formed on the light guide layer and including a plurality of randomly distributed first air bubbles, and scattering light whose path is controlled; An optical property improving member integrally formed on the foam layer and improving characteristics of the scattered light; And An adhesive member formed between the foam layer and the optical characteristic improving member to laminate the optical characteristic improving member on the foam layer, and having a plurality of third air bubbles randomly distributed therein; And the diameter of the third air bubbles is smaller than the diameter of the first air bubbles. delete delete A display unit for displaying an image; And A lamp for generating light for displaying the image, a light regulating plate including a plurality of randomly distributed first air bubbles and having a foam layer for scattering light provided from the lamp, the light adjusting plate controlling the light provided from the lamp, An optical property improving member integrally formed on the light adjusting plate and formed between the light adjusting plate and the optical property improving member to improve the property of the light provided from the light adjusting plate; A backlight assembly including an adhesive member laminated on a plate and having a plurality of third air bubbles randomly distributed therein, The diameter of the third air bubbles is smaller than the diameter of the first air bubbles. delete

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