KR101719156B1 - Liquid Crystal Display Device - Google Patents

Abstract

An embodiment of the present invention is to provide a liquid crystal display device in which a cover plate is attached on a front case front frame of a liquid crystal display device to protect the liquid crystal display panel of the liquid crystal display device. The liquid crystal display according to an embodiment of the present invention includes a liquid crystal display module including a liquid crystal display panel and a backlight unit, an external case in which a liquid crystal display module is installed so that a video display region of the liquid crystal display panel is exposed to the outside, And a first polarizer attached to a front surface of the cover plate so as to cover the entire surface of the cover plate.

A liquid crystal display device, a cover plate, a case,

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.

Due to the recent rapid development of semiconductor technology, the flat panel display device has increased in screen size and weight, and the performance of the flat panel display device has been improved, so that the demand of the flat panel display device has been explosively increased. Such flat panel display devices are not only bulky, light in weight, but also provide a clear display screen, and thus are used in all display devices such as TVs, monitors, and mobile phones.

Such flat panel display devices include a liquid crystal display (LCD), a plasma display device (PDP), and an organic light emitting diode (OLED).

Herein, the liquid crystal display device is a device in which a voltage is applied to a specific molecular arrangement of a liquid crystal to convert it into another molecular arrangement, and optical property changes such as birefringence, optical rotation, dichroism, And is a display device for displaying information by using modulation of light by a liquid crystal cell.

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 device, and FIG. 1B is a view showing a part of a cross-sectional view taken along line A-A of FIG. 1A.

1B, a general liquid crystal display 1000 includes a liquid crystal display module 1100 and a liquid crystal display module 1100. The liquid crystal display module 1100 includes a liquid crystal display module 1100, (1200).

The liquid crystal display module 1100 includes a liquid crystal display panel 1110 including a first substrate 1112 to which a first polarizing plate 1111 is attached and a second substrate 1114 to which a second polarizing plate 1116 is attached, A backlight unit 1120 for supplying light to the display panel 1110, a main frame 1130 for housing the liquid crystal display panel 1110 and the backlight unit 1120, And a case top 1140 configured to surround an edge portion of the panel 1110.

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

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

1A and 1B, in the case of a general liquid crystal display device 1000 having a structure as shown in FIGS. 1A and 1B, an external case 1200 is formed on the front edge of the liquid crystal display panel 1110 The front frame 1220 of the case 1200 is formed at the front edge portion of the LCD 1080 so as to surround the front frame 1220 of the case 1200, And thus the aesthetics of the liquid crystal display device 1000 is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is a technical object of the present invention to provide a liquid crystal display device in which a cover plate is attached on a front case front frame of a liquid crystal display device to protect the liquid crystal display panel of the liquid crystal display device .

The present invention also relates to a liquid crystal display device, a liquid crystal display device, and a polarizing plate, in which an air gap preventing layer is formed between a liquid crystal display and a cover plate or between a liquid crystal display and a polarizing plate to reduce an air gap between the liquid crystal display and a cover plate And to provide a liquid crystal display device.

It is another object of the present invention to provide a liquid crystal display device in which a polarizing plate is attached on a front case frame of an external case of a liquid crystal display device so that the front frame of the external case is not exposed to the outside when the power source of the liquid crystal display device is turned off. We will do it.

Another object of the present invention is to provide a liquid crystal display in which a mirror film is attached on a front surface of a polarizing plate attached to a liquid crystal display so that a liquid crystal display can realize a mirror function.

According to an aspect of the present invention, there is provided a liquid crystal display device including: a liquid crystal display module including a liquid crystal display panel and a backlight unit; a liquid crystal display module disposed inside the liquid crystal display module such that an image display area of the liquid crystal display panel is exposed to the outside A cover plate attached to the front frame of the case for covering the front surface of the case, and a first polarizer attached to the front surface of the cover plate so as to cover the front surface of the cover plate.

According to another aspect of the present invention, there is provided a liquid crystal display device including a liquid crystal display module including a liquid crystal display panel and a backlight unit, and a liquid crystal display module disposed inside the liquid crystal display module so that an image display area of the liquid crystal display panel is exposed to the outside. And a cover plate attached to the front surface of the first polarizing plate to cover the entire surface of the first polarizing plate and the first polarizing plate attached to the front frame of the case for covering the front case.

According to the present invention, by attaching the cover plate on the outer case front frame of the liquid crystal display device, it is possible to prevent the liquid crystal display panel of the liquid crystal display device from being impacted, to prevent scratching of the liquid crystal display panel, And 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 preventing layer by using a refractive index matching material between a liquid crystal display device and a cover plate or between a liquid crystal display and a polarizing plate, thereby forming an air gap between the liquid crystal display and the cover plate or between the liquid crystal display and the polarizing plate There is an effect that the luminance characteristic of the liquid crystal display device can be improved.

 Further, by attaching the polarizing plate on the outer case front frame of the liquid crystal display device, even when the power of the liquid crystal display device is turned off, the front frame of the outer case can be prevented from being exposed to the outside, It is effective.

Further, the present invention has the effect of enhancing the aesthetics of a liquid crystal display device and realizing a mirror function with a liquid crystal display device by further attaching a mirror film on the front surface of a polarizing plate attached to a liquid crystal display device.

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

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

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

First, the liquid crystal display module 2100 will be briefly described. 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 as shown in FIG.

The liquid crystal display panel 2110 displays a desired image by controlling the transmittance of light emitted from the backlight unit 2120. A 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 control the transmittance of light to display an image 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.

The liquid crystal display panel 2110 according to the first embodiment of the present invention is different from the conventional liquid crystal display panel in that the second polarizer 2116 is attached only to the second substrate 2114 and the polarizer is attached to the first substrate 2114 This is because the first polarizing plate 2400 is attached on 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 reflection plate 2124, A sheet 2125, and a bottom case 2126. Fig.

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

The light guide plate 2123 guides light incident from at least one light source 2121 disposed on at least one side of the light guide plate 2123 to the optical sheet 2125. This light guide plate 2123 allows the incident light to be refracted several times At least one pattern (not shown) may be provided. At this time, the light guide plate 2123 may be formed of polyethylene terephthalate, polyacrylate, polyethylene, polycarbonate, or polyester.

The reflection plate 2124 is disposed on the bottom surface of the bottom case 2126 for preventing light loss by reflecting light incident on the light guide plate 2123 and reflected toward the light guide plate 2123. The reflection plate 2124 may be formed to have a width equal to the width of the light guide plate 2123 or larger than the width of the light guide plate 2123 so as to prevent light leakage of light reflected in the light guide plate 2123.

In one embodiment, the reflector 2124 may be in the form of a thin film or a sheet and may be coated with silver over a base material such as SUS, brass, aluminum, PET to enhance reflectivity, A titanium coating can be applied to prevent deformation due to heat generated in the substrate.

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 with the light. Specifically, the optical sheet 2125 disperses 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 image displayed on the liquid crystal display panel 2110 has a uniform distribution luminance And at least one prism for increasing the brightness of the image displayed on the liquid crystal display panel 2110 by advancing the light incident from the diffusion sheet in a predetermined angle with the pitch of the prismatic shape, A sheet, and a protective sheet for protecting the prism sheet.

The bottom case 2126 is disposed at the lowermost part of the backlight unit 2120 and surrounds the reflection plate 2124. The bottom case 2126 may be formed of a material having a high thermal conductivity so that heat generated in the backlight unit 2120 can be emitted to the outside .

The main frame 2130 includes a liquid crystal display channel 2110 and a 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, And includes a plurality of stepped surfaces formed in the shape of a circle. At this time, the liquid crystal display panel 2110 housed in the panel housing portion is housed so as to face the backlight unit 2120 accommodated in the backlight unit housing portion.

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.

The external case 2200 is installed inside the liquid crystal display module 2100 and the external case 2200 is connected to the liquid crystal display panel 2110 via the liquid crystal display panel 2110, The rear surface and the entire side surface of the liquid crystal display panel 2100 so as to be exposed to the outside.

The case 2200 includes a side frame 2210 formed to enclose the side surface of the liquid crystal display module 2100, a front frame 2220 configured to surround the front edge portion, and a rear frame (not shown) .

The cover plate 2300 is attached to the front frame 2220 of the case 2200 so as to cover the entire front surface of the case 2200 and is exposed to the outside through the case 2200. [ 2110) is protected from impact and prevents the scratching of the liquid crystal display panel (2110).

As a result, since the cover plate 2300 is attached to the front frame 2220 of the case 2200 as described above, the front of the liquid crystal display 2000 can be seen to be flat, Can be improved.

In one embodiment, the cover plate 2300 may be made of a material selected from the group consisting of polyethylene terephthalate, polyacrylate, polyethylene, polycarbonate, polyester, Can be formed using a material.

Although the front frame 2220 of the case 2200 can not be visually recognized by attaching the cover plate 2300 on the front frame 2220 of the case 2200 as described above, Since the cover plate 2300 is formed of a transparent material, when the power of the liquid crystal display 2000 is turned off, the cover case 2300 is fixed to the outer case 2200 provided on the front edge of the liquid crystal display panel 2100 through the transparent cover plate 2300 The front frame 2220 must be visually recognized.

Accordingly, in the case of the liquid crystal display device 2000 according to the first embodiment of the present invention, when the power supply of the liquid crystal display device 2000 is turned off, the external case 2200 installed on the front edge of the liquid crystal display panel 2100 A first polarizing plate 2400 is attached on the front surface of the cover plate 2300 so as to cover the entire front surface of the cover plate 2300 so that the front frame 2220 can not be visually recognized.

That is, in the case of the liquid crystal display 2000 according to the first embodiment of the present invention, since the first polarizing plate 2400 is further attached on the front surface of the cover plate 2300, The front frame 2220 of the case 2200 installed at the front edge of the liquid crystal display module 2100 is visually identified by the first polarizing plate 2400 attached on the front surface of the cover plate 2300, It can not be.

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

As shown in FIG. 3, the first polarizing plate 2400 may be formed by using a polyvinyl alcohol (PVA) film 3100 treated with iodine as a polarizing base film, Triacetate cellulose (TAC) films 3110 and 3120, which have excellent transparency, ultraviolet ray absorbability and durability as well as stability against deformation and abrasion resistance, are used as a protective layer for protecting the PVA film 3100. A release film (not shown) and a protective 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 an embodiment of the present invention having the structure as shown in FIG. 3 on the front surface of the cover plate 2300. In one embodiment, the pressure sensitive adhesive 3130 may be a pressure sensitive adhesive (PSA). For example, a pressure-sensitive adhesive containing an acrylic copolymer capable of preventing the peeling of the pressure-sensitive adhesive 3130 by reducing the generation of fine bubbles between the cover plate 2300 and the pressure-sensitive adhesive 3130 layer with good elasticity and adhesion properties may be used .

The pressure sensitive adhesive 3130 not only attaches the first polarizing plate 2400 to the cover plate 2300 but also strengthens the moisture resistance of the first polarizing plate 2400 and has a certain elasticity so that the first polarizing plate 2400, .

Second Embodiment

In the first embodiment described above, it is described that the cover plate 2300 is attached on the front frame 2220 of the case 2200. [ However, in the first embodiment, an air gap is generated between the cover plate 2300 and the liquid crystal display panel 2110. This air gap is formed between the liquid crystal display panel 2110 and the cover plate 2300, The moving direction of the light may be changed due to a difference in refractive index between the liquid crystal display channel 2110 and the air, or internal reflection may occur between the air layers, thereby deteriorating the image quality.

Therefore, in the second embodiment, as shown in FIG. 2C, an air gap preventing layer 2500 for reducing an air gap may be formed between the cover plate 2300 and the liquid crystal display panel 2110. In one embodiment, the air gap barrier layer 2500 may be formed using an index matching material. Specifically, the refractive index matching material is filled between the cover plate 2300 and the liquid crystal display panel 2110, and then the refractive index matching material is cured by UV, thereby forming an air gap preventing layer between the liquid crystal display panel 2110 and the cover plate 2300 .

For example, since the refractive index of the liquid crystal display panel 2110 is about 1.5, the refractive index matching material may have a refractive index of about 1.5 Can be used.

The air gap preventing layer 2500 may be formed not only between the cover plate 2300 and the liquid crystal display panel 2110 but also between the cover plate 2300 and the front frame 2220 of the case 2200 It will be possible.

The air gap preventing layer 2500 is separately formed between the liquid crystal display panel 2110 and the cover plate 2300. In the modified embodiment, A refractive index matching material may be used to attach the cover plate 2300 to the cover plate 2320. That is, the air gap preventing layer 2500 may be formed by attaching the cover plate 2300 on the front frame of the case 2200 by using the index matching adhesive (Index Matching Adhesive).

Third Embodiment

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

In the third embodiment described above, a separate mirror film 2600 is additionally provided on the first polarizing plate 2400. In the modified embodiment, the first polarizing plate 2400 is provided with a separate mirror film 2600. However, It is possible to attach both the first polarizing plate 2400 and the mirror film 2600 together by attaching only one film containing the polarizing property and the mirroring property on the cover plate 2300 instead of further attaching the mirror film 2600 It may be possible to produce the same effect as the attachment. For example, by attaching a film such as a Dual Brightness Enhancement Film Polarizer (DBEF-P) on the cover plate 2300, it is possible to produce the same effect as attaching both the first polarizing plate 2400 and the mirror film 2600 will be.

In another embodiment, a separate mirror film 2600 may be added on 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 ) May be formed of a film such as DBEF-P.

 Fourth Embodiment

It is described in the first embodiment that the cover plate 2300 is attached on the front frame 2220 of the case 2200 and the first polarizer 2400 is attached on the front surface of the cover plate 2300 Respectively.

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

5, the first polarizing plate 4400 includes a polarizing base film as the PVA film 5100 and a protective layer for protecting the PVA film 5100 as the TAC films 5110 and 5120 And a pressure sensitive adhesive 5130 such as PSA may be used to attach the cover plate 4300 on the front surface of the first polarizing plate 4400. [ On the other hand, a release film (not shown) and a protective 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 device 4000 according to the fourth embodiment, the first polarizing plate 4400 is attached on the front frame 4220 of the case 4200, The other configuration except that the plate 4300 is attached is the same as that of the liquid crystal display 2000 according to the above-described first embodiment, and a detailed description thereof will be omitted.

Fifth Embodiment

4C, in order to reduce the air gap between the first polarizing plate 4400 and the liquid crystal display panel 4110, the first polarizing plate 4400 and the liquid crystal display An air gap preventing layer 4500 may be additionally formed between the panels 4110.

In this case, the air gap preventing layer 4500 can be formed using a refractive index matching material. In the same way as the liquid crystal display 2000 according to the second embodiment described above, the air gap preventing layer 4500 can be formed of the first polarizing plate 4400 And the liquid crystal display channel 4110 as well as between the first polarizing plate 4400 and the front frame 4220 of the case 4200.

The air gap preventing layer 4500 may be formed by adhering the first polarizing plate 4400 onto the front frame 4220 of the case 4200 using a refractive index matching material instead of forming the air gap preventing layer 4500. [ May be formed. That is, by attaching the first polarizing plate 4400 on the front frame 4220 of the case 4200 using a refractive index matching adhesive, the liquid crystal display panel 4110 and the first polarizing plate 4400, and the case 4200, An air gap preventing layer 4500 may be formed between the front frame 4220 and the first polarizing plate 4400. [

Sixth Embodiment

In the case of the liquid crystal display device according to the sixth embodiment, as shown in FIG. 4D, in order to enable the liquid crystal display device 4000 to perform the mirror function, the liquid crystal display device 4000 according to the fourth embodiment The mirror film 4600 may be attached on the front surface of the first polarizing plate 4400 and the cover plate 4300 may be attached on 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 third embodiment described above, Only one film including both of the first polarizing plate 4400 and the mirroring property is attached on the front frame 4220 of the case 4200 so that the same effect as that of attaching both the first polarizing plate 4400 and the mirroring film 4600 It might be.

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

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

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

1B is a view showing a part of a section A-A in Fig.

FIGS. 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. FIG.

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

4A to 4D are views showing the structure of a liquid crystal display device according to 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 external case having the liquid crystal display module installed therein so that a video display region of the liquid crystal display panel is exposed to the outside; A cover plate attached to a front frame of the case to cover the entire front surface of the case; And And a first polarizer attached to a front surface of the cover plate so as to cover the entire front surface of the cover plate to prevent a front frame of the outer case from being visually recognized. The liquid crystal display panel according to claim 1, And a second substrate facing the first substrate and having a second polarizer attached thereto, In the liquid crystal display module, A main frame for accommodating the liquid crystal display panel and the backlight unit; And Further comprising a case top formed to surround an edge portion of the liquid crystal display panel and an outer surface of the main frame so that a video display region of the liquid crystal display panel is exposed to the outside. The method according to claim 1, And an air gap preventing layer formed between the front surface of the liquid crystal display module and the cover plate using an index matching material. The method according to claim 1, Wherein the first polarizer and the cover plate are bonded using a pressure sensitive adhesive (PSA). The method according to claim 1, And a mirror film attached to a front surface of the first polarizer. A liquid crystal display module including a liquid crystal display panel and a backlight unit; An external case having the liquid crystal display module installed therein so that a video display region of the liquid crystal display panel is exposed to the outside; A first polarizer attached to a front frame of the case to cover the entire front surface of the case so that a front frame of the case is not visible; And And a cover plate attached to a front surface of the first polarizing plate to cover the entire front surface of the first polarizing plate. The method according to claim 6, And an air gap preventing layer formed between the front surface of the liquid crystal display module and the first polarizing plate using a refractive index matching material. The method according to claim 6, And a mirror film disposed between the first polarizer plate and the cover plate. 9. The method according to any one of claims 1 to 8, Wherein the cover plate is formed using polyethylene terephthalate, polyacrylate, polyethylene, polycarbonate, polyester, or tempered glass. 8. A method according to any one of claims 1 to 4, 6, and 7, Wherein the first polarizer is formed of a DBEF-P (Dual Brightness Enhancement Film Polarizer) film.

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