KR20110061027A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: A liquid crystal display device is provided to attach a cover plate on an external case frame of a liquid crystal display device in order to protect a liquid crystal display panel of a liquid crystal display device. CONSTITUTION: A liquid crystal display module includes a liquid crystal display panel and a backlight unit. A case(2200) is installed at the liquid crystal display module inside the image display region of the liquid crystal display panel. A cover plate(2300) is attached to the front frame of the case in order to cover up the front side of the case. A first polarizer(2400) is attached to the front side of the cover plate.

Description

[0001] The present invention relates to a liquid crystal display device,

The present invention relates to a flat panel display device, and more particularly, to a liquid crystal display device.

With the recent rapid development of semiconductor technology, as the screen size of flat panel displays increases and the weight of the flat panel displays improves, the demand for flat panel displays increases explosively. Such a flat panel display device is not only bulky, light in weight, and also implements a clear display screen, and thus is used in all display devices such as TVs, monitors, and mobile phones.

Such flat panel displays include liquid crystal displays (LCDs), plasma display devices (PDPs), and organic light emitting diodes (OLEDs).

In this case, the liquid crystal display device converts an optical property such as birefringence, photoreactivity, dichroism, and light scattering characteristics of a liquid crystal cell that emits light by applying a voltage to a specific molecular array of the liquid crystal and converts it into another molecular array. It is a display apparatus which displays information using the modulation of the light by a liquid crystal cell as converting into a visual change.

The structure of such a general liquid crystal display device is shown in FIGS. 1A and 1B. FIG. 1A is a perspective view of a general liquid crystal display, and FIG. 1B is a view showing a portion of the sectional view taken along line A-A of FIG. 1A.

As shown in FIG. 1B, the general LCD apparatus 1000 includes an external case formed to surround the LCD display module 1100 such that an image display area of the LCD display module 1100 and the liquid crystal display module 1100 is exposed to the outside. (1200).

The liquid crystal display module 1100 includes a first substrate 1112 having a first polarizer 1111 and a second substrate 1114 having a second polarizer 1116, and the liquid crystal display. The backlight unit 1120 for supplying light to the display panel 1110, the main frame 1130 for accommodating the liquid crystal display panel 1110 and the backlight unit 1120, and the exterior of the main frame 1130 and the liquid crystal display. The case top 1140 is formed to surround the edge of the panel 1110.

The exterior case 1200 includes a side frame 1210 formed to surround the side of the liquid crystal display module 1100, a front frame 1220 formed to surround the front edge portion, and a rear frame (not shown) formed to surround the rear surface. do.

However, in the general liquid crystal display device 1000 having the structure shown in FIGS. 1A and 1B, the image display area of the liquid crystal display panel 1110 is directly exposed to the outside of the exterior case 1200. During the storage or movement of the liquid crystal display device 1000, the liquid crystal display panel 1110 may be damaged by an impact, the surface of the liquid crystal display panel 1110 may be scratched, or foreign substances may penetrate into the liquid crystal display device 1000. There is a problem.

In addition, in the case of the general liquid crystal display device 1000 having the structure shown in FIGS. 1A and 1B, the exterior case 1200 may have the front edge of the LCD panel 1110 as shown in FIGS. 1A and 1B. Since the front frame 1220 of the exterior case 1200 must be formed at the front edge portion of the liquid crystal display device 1080 so as to surround the portion, the front frame 1220 of the exterior case 1200 is formed. As a result, the aesthetics of the liquid crystal display device 1000 may be impaired.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a liquid crystal display device having a cover plate attached to an outer case front frame of the liquid crystal display device to protect the liquid crystal display panel of the liquid crystal display device. .

In addition, the present invention provides an air gap prevention layer formed between the liquid crystal display and the cover plate or between the liquid crystal display and the polarizer to reduce the air gap between the liquid crystal display and the cover plate or between the liquid crystal display and the polarizer. It is another technical problem to provide a liquid crystal display device.

In addition, the present invention provides a liquid crystal display device having a polarizing plate attached on the outer case front frame of the liquid crystal display device so that the front frame of the outer case is not exposed to the outside when the power of the liquid crystal display device is turned off. It is a task.

In addition, another object of the present invention is to provide a liquid crystal display device having a mirror film on the front surface of a polarizing plate attached to the liquid crystal display device so that the liquid crystal display device can implement a mirror function.

According to an aspect of the present invention, a liquid crystal display device includes a liquid crystal display module including a liquid crystal display panel and a backlight unit; An outer case in which the liquid crystal display module is installed to expose the image display area of the liquid crystal display panel to the outside; A cover plate attached to a front frame of the outer case to cover the front of the outer case; And a first polarizing plate attached to the front surface of the cover plate to cover the front surface of the cover plate.

According to another aspect of the present invention, a liquid crystal display device includes a liquid crystal display module including a liquid crystal display panel and a backlight unit; An outer case in which the liquid crystal display module is installed to expose the image display area of the liquid crystal display panel to the outside; A first polarizer attached to the front frame of the outer case to cover the front of the outer case; And a cover plate attached to the front surface of the first polarizing plate to cover the front surface of the first polarizing plate.

According to the present invention, by attaching a cover plate on the front frame of the outer case of the liquid crystal display device to protect the liquid crystal display panel of the liquid crystal display from impact or to prevent scratches on the surface of the liquid crystal display panel and to prevent foreign substances from penetrating into the liquid crystal display device. Of course, the front frame of the outer case can be prevented from being exposed to the outside.

In addition, the present invention forms an air gap prevention layer using a refractive index matching material between the liquid crystal display device and the cover plate or between the liquid crystal display device and the polarizing plate to form an air gap between the liquid crystal display device and the cover plate or between the liquid crystal display device and the polarizing plate. By reducing it, there is an effect that the luminance characteristic of the liquid crystal display device can be improved.

 In addition, by attaching a polarizing plate on the front frame of the external case of the liquid crystal display device, the front frame of the external case can be prevented from being exposed to the outside even when the power supply of the liquid crystal display device is turned off, thereby improving the aesthetics of the liquid crystal display device. It works.

In addition, the present invention has an effect that it is possible to implement a mirror function with a liquid crystal display device while increasing the aesthetics of the liquid crystal display device by additionally attaching a mirror film on the front surface of the polarizing plate attached to the liquid crystal display device.

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

2A is a perspective view of a liquid crystal display according to a first embodiment of the present invention, and FIG. 2B is a view showing a portion of a cross-sectional view of the liquid crystal display according to the first embodiment of the present invention.

Referring to FIG. 2B, the liquid crystal display device 2000 according to an exemplary embodiment of the present invention includes a liquid crystal display module 2100, an external case 2200, a cover plate 2300, and a first polarizing plate 2400. .

First, the liquid crystal display module 2100 will be briefly described. As illustrated in FIG. 2B, the liquid crystal display module 2100 includes a liquid crystal display panel 2110, a backlight unit 2120, a main frame 2130, and a case top 2140.

The liquid crystal display panel 2110 displays a desired image by adjusting the transmittance of light emitted from the backlight unit 2120. To this end, the liquid crystal display channel 2110 is formed between the first substrate 2112 and the second substrate 2114 and the first substrate 2112 and the second substrate 2114 to display an image by controlling light transmittance. A liquid crystal layer (not shown), and a second polarizing plate 2116 attached to the second substrate. Here, the first substrate may be an upper substrate, and the second substrate may be a lower substrate.

Unlike a general liquid crystal display panel, the liquid crystal display panel 2110 according to the first embodiment of the present invention has a second polarizing plate 2116 attached only to the second substrate 2114, and a polarizing plate attached to the first substrate 2114. This is because the first polarizing plate 2400 is attached to the front surface of the cover plate 2300 as shown in FIG. 2A.

The backlight unit 2120 irradiates light to the liquid crystal display panel 2110, and includes at least one light source 2121, a PCB 2122 on which the at least one light source is mounted, a light guide plate 2123, a reflector 2124, and an optical. A seat 2125, and a bottom case 2126.

The one or more light sources 2121 generate light to enter the light guide plate 2123, and are disposed on at least one side of the light guide plate 2123. In one embodiment, the light source 2121 may be one or more light emitting diodes (LEDs) or cold cathode fluorescent lamps (CCFLs), and the light source 2121 may be one or more light emitting diodes. When configured, each of the light emitting diodes is mounted on the PCB 2122 at a predetermined interval in a package form.

The light guide plate 2123 propagates light incident from one or more light sources 2121 disposed on at least one side of the light guide plate 2123 to the optical sheet 2125, and the light guide plate 2123 may be refracted by the incident light several times. It may have at least one pattern (not shown) in order to. In this case, the light guide plate 2123 may be formed of polyethylene terephthalate, polyacrylate, polyethylene, polycarbonate, or polyester.

The reflective plate 2124 is used to prevent light loss by reflecting light incident through the light guide plate 2123 toward the light guide plate 2123 and disposed on the bottom surface of the bottom case 2126. In this case, the reflector 2124 may be formed to be the same as the width of the light guide plate 2123 or larger than the width of the light guide plate 2123 to prevent light leakage of light reflected from the light guide plate 2123.

In one embodiment, the reflector plate 2124 may be in the form of a thin film or sheet, and coated with silver on a base material such as SUS, brass, aluminum, PET, etc. to increase the reflectance, and the light source 2121. Titanium coatings can be applied to prevent thermal deformation from occurring.

The optical sheet 2125 improves the brightness and uniformity of light incident from the light guide plate 2123 and irradiates the liquid crystal display panel 2110. In detail, the optical sheet 2125 distributes the light incident from the light guide plate 2123 and uniformly supplies the light to the image display area of the liquid crystal display panel 2110 so that the brightness of the image displayed on the liquid crystal display panel 2110 is evenly distributed. At least one diffusing sheet for having a light and at least one prism for increasing the luminance of an image displayed on the liquid crystal display panel 2110 by causing the light incident from the diffusing sheet to travel in a predetermined direction at a pitch and angle of a prism shape. And a protective sheet for protecting the sheet and the prism sheet.

The bottom case 2126 is positioned at the bottom of the backlight unit 2120 to surround the reflective plate 2124 and may be formed of a material having high thermal conductivity so that heat generated from the backlight unit 2120 may be discharged to the outside. .

The main frame 2130 accommodates the liquid crystal display channel 2110 and the backlight unit 2120. The main frame 2130 includes a panel accommodating portion accommodating the liquid crystal display panel 2110 and a backlight accommodating portion accommodating the backlight unit 2120. It includes a plurality of stepped surface formed in the form. In this case, the liquid crystal display panel 2110 accommodated in the panel accommodating part may be accommodated to face the backlight unit 2120 accommodated in the backlight unit accommodating part.

The top case 2140 is installed to surround the edge of the liquid crystal display panel 2110 and the side surface of the main frame 2130 so that the liquid crystal display panel 2110 is fixed to the main frame 2130.

Next, the outer case 2200 is the liquid crystal display module 2100 is installed therein, the outer case 2200 is an image display area of the liquid crystal display panel 2110 included in the liquid crystal display module 2100 It is formed to surround the front edge, the rear and the entire side of the liquid crystal display panel 2100 so as to be exposed to the outside.

The exterior case 2200 is a side frame 2210 formed to surround the side of the liquid crystal display module 2100 and a front frame 2220 formed to surround the front edge portion and a rear frame (not shown) formed to surround the rear surface. It is composed.

Next, the cover plate 2300 is attached to the front frame 2220 of the outer case 2200 to cover the entire front surface of the outer case 2200 and is exposed to the outside through the outer case 2200 ( It protects the 2110 from impact and prevents scratches of the liquid crystal display channel 2110.

In addition, since the cover plate 2300 is attached to the front frame 2220 of the outer case 2200 as described above, the front surface of the liquid crystal display device 2000 becomes flat, resulting in the liquid crystal display device 2000. The sense of aesthetics can be improved.

In one embodiment, the cover plate 2300 is made of polyethylene terephthalate, polyacrylate, polyethylene, polycarbonate, polyester, or tempered glass. It may be formed using a material.

On the other hand, by attaching the cover plate 2300 on the front frame 2220 of the outer case 2200 as described above, it is possible to prevent the front frame 2220 of the outer case 2200 cannot be visually identified, Since the cover plate 2300 is formed of a transparent material, when the power of the liquid crystal display device 2000 is turned off, the cover plate 2300 may be disposed on the front edge of the liquid crystal display panel 2100 through the transparent cover plate 2300. The front frame 2220 can only be visually identified.

Therefore, in the case of the liquid crystal display device 2000 according to the first exemplary embodiment of the present invention, when the power of the liquid crystal display device 2000 is turned off, the exterior case 2200 of the external case 2200 is installed at the front edge of the liquid crystal display panel 2100. In order to prevent the front frame 2220 from being visually identified, a first polarizing plate 2400 is attached on the front surface of the cover plate 2300 to cover the entire front surface of the cover plate 2300.

That is, in the case of the liquid crystal display device 2000 according to the first exemplary embodiment of the present invention, since the first polarizing plate 2400 is additionally attached on the front surface of the cover plate 2300, the power supply of the liquid crystal display device 2000 is applied. Even if it is off, the front frame 2220 of the outer case 2200 installed at the front edge of the liquid crystal display module 2100 is visually identified by the first polarizing plate 2400 attached to the front surface of the cover plate 2300. It will not be possible.

On the other hand, since the polarizing plate is not attached to the first substrate of the liquid crystal display panel 2110 as described above, the first polarizing plate 2400 attached to the front surface of the cover plate 2300 is a general liquid crystal display panel. The function of the polarizer attached to the first substrate of 2100 is also performed.

As shown in FIG. 3, the first polarizing plate 2400 is a polyvinyl alcohol (PVA) film 3100 treated with iodine (Iodine) as a polarizing base film, Triacetate Cellulose (TAC) films 3110 and 3120 having excellent transparency, UV absorption, and durability as well as stability against deformation, and a PVA film 3100 are formed as a protective layer. In addition, a release film (not shown) and a protection film (not shown) may be further attached to protect the TAC films 3110 and 3120 and the PVA film 3100 adhered to each other.

An adhesive 3130 may be used to attach the first polarizing plate 2400 according to the exemplary embodiment having the structure as illustrated in FIG. 3 on the front surface of the cover plate 2300. In one embodiment, a pressure sensitive adhesive (PSA) may be used as the pressure sensitive adhesive 3130. For example, an adhesive including an acrylic copolymer having good elastic modulus and adhesive properties and capable of preventing peeling of the adhesive 3130 by reducing occurrence of fine bubbles between the cover plate 2300 and the adhesive 3130 layer may be used. .

The pressure-sensitive adhesive 3130 not only attaches the first polarizing plate 2400 to the cover plate 2300, but also reinforces the moisture resistance of the first polarizing plate 2400, and has a constant elasticity to prevent the first polarizing plate 2400 from external impact. Serves to protect the

Second embodiment

In the above-described first embodiment, the cover plate 2300 is attached to the front frame 2220 of the outer case 2200. However, in the first embodiment, an air gap is generated between the cover plate 2300 and the liquid crystal display panel 2110, and this air gap is formed between the liquid crystal display panel 2110 and the cover plate 2300. When this occurs, the direction of movement of light may be changed due to the difference in refractive index between the liquid crystal display channel 2110 and air, or internal reflection may occur between the air layers, thereby degrading image quality.

Therefore, in the second embodiment, as shown in FIG. 2C, an air gap prevention layer 2500 may be formed between the cover plate 2300 and the liquid crystal display panel 2110 to reduce the air gap. In one embodiment, the air gap prevention layer 2500 may be formed using an index matching material. Specifically, an air gap prevention layer is formed between the liquid crystal display panel 2110 and the cover plate 2300 by filling the refractive index matching material between the cover plate 2300 and the liquid crystal display panel 2110 and curing the refractive index matching material with UV. Can be formed.

In this case, the refractive index matching material may be a material having the same refractive index as that of the liquid crystal display panel 2110. For example, since the refractive index of the liquid crystal display panel 2110 is approximately 1.5, the refractive index of the refractive index matching material is about 1.5. It is possible to use a substance having a.

The air gap prevention layer 2500 may be formed not only in the region between the cover plate 2300 and the liquid crystal display panel 2110, but also in the region between the cover plate 2300 and the front frame 2220 of the outer case 2200. Could be.

In the above-described embodiment, the air gap prevention layer 2500 is separately formed between the liquid crystal display panel 2110 and the cover plate 2300. However, in the modified embodiment, the front frame of the exterior case 2200 is described. When attaching the cover plate 2300 to the 2220, a refractive index matching material may be used. That is, the air gap prevention layer 2500 may be formed by attaching the cover plate 2300 on the front frame of the outer case 2200 using an index matching adhesive.

Third embodiment

In the case of the liquid crystal display according to the third embodiment of the present invention, as shown in FIG. 2D, the liquid crystal display 2000 according to the first embodiment may enable the liquid crystal display 2000 to perform a mirror function. The mirror film 2600 may be further attached onto the front surface of the first polarizing plate 2400.

In the above-described third embodiment, an additional mirror film 2600 is additionally attached to the first polarizing plate 2400. However, in the modified embodiment, the separate polarizing film 2400 is additionally attached to the first polarizing plate 2400. Rather than attaching the mirror film 2600 additionally, only the first film including both the polarization and mirror properties is attached to the cover plate 2300 so that both the first polarizing plate 2400 and the mirror film 2600 are attached. You might be able to get the same effect as you attached. For example, by attaching a film such as Dual Brightness Enhancement Film Polarizer (DBEF-P) onto the cover plate 2300, the same effect as that of attaching both the first polarizing plate 2400 and the mirror film 2600 may be achieved. will be.

In another embodiment, an additional mirror film 2600 is added to the first polarizing plate 2400 of the liquid crystal display 2000 according to the second embodiment, or the liquid crystal display 2000 according to the second embodiment. The first polarizing plate 2400 may be formed of a film such as DBEF-P.

 Fourth embodiment

In the first embodiment described above, the cover plate 2300 is attached to the front frame 2220 of the outer case 2200, and the first polarizing plate 2400 is attached to the front surface of the cover plate 2300. It was.

However, in the liquid crystal display 4000 according to the fourth embodiment, as illustrated in FIGS. 4A and 4B, the first polarizing plate 4400 is attached to the front frame 4220 of the exterior case 4200. The cover plate 4300 may be attached on the front surface of the first polarizing plate 4400.

In this case, as shown in FIG. 5, the first polarizing plate 4400 is configured by using a PVA film 5100 as a polarizing substrate film and TAC films 5110 and 5120 as a protective layer protecting the PVA film 5100. In order to attach the cover plate 4300 on the front surface of the first polarizing plate 4400, an adhesive 5130 such as PSA may be used. Meanwhile, a release film (not shown) and a protection film (not shown) may be further attached to protect the TAC films 5110 and 5120 and the PVA film 5100 adhered to each other.

In the case of the liquid crystal display 4000 according to the fourth exemplary embodiment, the first polarizing plate 4400 is attached to the front frame 4220 of the exterior case 4200, and the cover is disposed on the front surface of the first polarizing plate 4400. The other configuration except that the plate 4300 is attached is the same as that of the liquid crystal display device 2000 according to the first embodiment, and thus a detailed description thereof will be omitted.

Fifth Embodiment

In the case of the liquid crystal display according to the fifth embodiment, as shown in FIG. 4C, the first polarizing plate 4400 and the liquid crystal display to reduce the air gap between the first polarizing plate 4400 and the liquid crystal display panel 4110. An air gap prevention layer 4500 may be further formed between the panels 4110.

In this case, the air gap preventing layer 4500 may be formed using a refractive index matching material, and the air gap preventing layer 4500 may be formed on the first polarizing plate 4400 in the same manner as the liquid crystal display device 2000 according to the second embodiment. ) And the area between the first polarizing plate 4400 and the front frame 4220 of the outer case 4200, as well as the area between the liquid crystal display channel 4110 and the liquid crystal display channel 4110.

In addition, the air gap prevention layer 4500 may be formed by bonding the first polarizing plate 4400 onto the front frame 4220 of the exterior case 4200 using a refractive index matching material instead of forming a separate air gap prevention layer 4500. It may also be formed. That is, by attaching the first polarizing plate 4400 on the front frame 4220 of the outer case 4200 using a refractive index matching adhesive, between the liquid crystal display panel 4110 and the first polarizing plate 4400 and the outer case 4200. An air gap prevention layer 4500 may be formed between the front frame 4220 and the first polarizer 4400.

Sixth embodiment

In the case of the liquid crystal display according to the sixth embodiment, as shown in FIG. 4D, the liquid crystal display 4000 according to the fourth embodiment may be used to perform the mirror function. The mirror film 4600 may be attached onto the front surface of the first polarizing plate 4400, and the cover plate 4300 may be attached onto the mirror film 4600.

In the modified embodiment, instead of attaching a separate mirror film 4600 on the front surface of the first polarizing plate 4400 as in the above-described third embodiment, the polarization characteristics are the same as in the DBEF-P film. And attaching only one film including both mirror and mirror characteristics on the front frame 4220 of the exterior case 4200 to produce the same effect as attaching both the first polarizing plate 4400 and the mirror film 4600. Could be

In another embodiment, a separate mirror film 4600 is added to the entire surface of the first polarizing plate 4400 of the liquid crystal display 4000 according to the fifth embodiment, or the liquid crystal display according to the fifth embodiment The first polarizer 4400 of 4000 may be formed of a film such as DBEF-P.

Those skilled in the art to which the present invention pertains will understand that the above-described present invention can be implemented in other specific forms without changing the technical spirit or essential features.

Therefore, it is to be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

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

1B shows a portion of the A-A cross section of FIG. 1D.

2A to 2D are views showing the structure of a liquid crystal display device according to the first to third embodiments of the present invention.

3 is a view showing an adhesive structure of a polarizing plate and a cover plate according to the first embodiment of the present invention.

4A to 4D are views showing the structure of a liquid crystal display device according to a fourth to sixth embodiments of the present invention.

5 is a view showing an adhesive structure of a polarizing plate and a cover plate according to a fourth embodiment of the present invention.

Claims (10)

A liquid crystal display module including a liquid crystal display panel and a backlight unit; An outer case in which the liquid crystal display module is installed to expose the image display area of the liquid crystal display panel to the outside; A cover plate attached to a front frame of the outer case to cover the front of the outer case; And And a first polarizer attached to the front side of the cover plate to cover the front side of the cover plate. The liquid crystal display module of claim 1, wherein A liquid crystal display panel comprising a first substrate and a second substrate facing the first substrate and having a second polarizing plate attached thereto; A backlight unit radiating light onto the liquid crystal display panel; A main frame accommodating the liquid crystal display panel and the backlight unit; And And a case top formed to surround an edge of the liquid crystal display panel and an exterior of the main frame so that the image display area of the liquid crystal display panel is exposed to the outside. The method of claim 1, And an air gap prevention layer formed between a front surface of the liquid crystal display module and the cover plate by using an index matching material. The method of claim 1, The first polarizing plate and the cover plate are bonded using a pressure sensitive adhesive (PSA). The method of claim 1, And a mirror film attached to the front surface of the first polarizing plate. A liquid crystal display module including a liquid crystal display panel and a backlight unit; An outer case in which the liquid crystal display module is installed to expose the image display area of the liquid crystal display panel to the outside; A first polarizer attached to the front frame of the outer case to cover the front of the outer case; And And a cover plate attached to the front surface of the first polarizer to cover the front surface of the first polarizer. The method of claim 6, And an air gap prevention layer formed between a front surface of the liquid crystal display module and the first polarizing plate by using a refractive index matching material. The method of claim 6, And a mirror film disposed between the first polarizing plate and the cover plate. The method according to any one of claims 1 to 8, The cover plate is a liquid crystal display, characterized in that formed using polyethylene terephthalate (polyethylene terephthalate), polyacrylate (polyacrylate), polyethylene (polyethylene), polycarbonate, polyester (polyester), or tempered glass Device. The method according to any one of claims 1 to 4, 6, and 7, The first polarizer is a liquid crystal display, characterized in that formed of a dual brightness enhancement film polarizer (DBEF-P) film.

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