KR20110062786A - Display device - Google Patents

Abstract

PURPOSE: A display device is provided to prevent a front cover from being attached to a screen and to prevent the transformation of an external design according to the increase of the product temperature by power supply. CONSTITUTION: A front cover(100) includes a first layer having first thermal expansion coefficient and a second thermal expansion coefficient. A display module(30) is arranged in the rear side of the front cover. A driving unit(60) drives a display module. A rear cover(50) covers the rear side of the display module. The first layer is located in the front side of the front cover. The second layer is located in the rear side of the front cover.

Description

Display device

The present invention relates to a display device capable of preventing deformation of the appearance design due to an increase in the internal temperature of the product.

The present invention relates to a display device, and more specifically, since a deformation of a front cover, that is, a screen attachment phenomenon, does not occur due to an increase in an internal temperature of a product by power supply, an excellent appearance design can be produced, and high quality display quality can be maintained. It relates to a display device that can be.

The display device refers to a device that displays an image signal input from the outside. Such a display device is a concept including a monitor for displaying an image received from a computer and a television for displaying an image and a sound transmitted from a broadcasting station, and all devices for displaying an image input from the outside.

Recently, high-quality large display devices equipped with flat panel display modules such as liquid crystal display panels (LCDs) or plasma display panels (PDPs) have been in the spotlight.

Such a display device includes a display module for realizing an image, a front cover surrounding a front edge of the display module, and a rear cover covering a rear of the display module.

Recently, as the display device has been enlarged, slimmed, and advanced, design elements for satisfying the user's aesthetics as well as basic image display functions have been emphasized.

In particular, since the front cover of the display device is exposed to the front and is a prominent part of the user, the image of the product varies greatly depending on how the front cover is designed.

Therefore, it is very important to improve the appearance quality of the front cover in order to deliver a high-quality image, and the display device is required to harmonize the design of the front cover and the home interior in accordance with the trend of enlargement.

For example, a borderless display device, which removes the boundary between the screen portion (display area) and the bezel portion (non-display area) of the display device, is reminiscent of one giant black glass plate or frame. Is being developed.

On the other hand, as the screen portion of the display device is enlarged and the overall thickness becomes slim, the front cover also has a large area and a reduced thickness.

When power is applied to the display device for operation, the temperature inside the display device is increased due to heat generated from the display module, and the like, and the front cover is heated and deformation is generated by the heat.

In particular, a phenomenon in which the front cover is bent and attached to the display module side due to thermal expansion, may occur, thereby causing a problem of deterioration in image quality.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a display device capable of preventing deformation of the appearance design generated as the temperature inside the product increases.

In addition, another object of the present invention is to provide a display device capable of producing an excellent design by preventing the screen attachment phenomenon of the front cover.

In addition, another object of the present invention is to provide a display device capable of maintaining a high-quality display quality regardless of a temperature change inside the product.

The present invention is to achieve the above object, the front cover; The front cover includes a display module including a first layer having a first coefficient of thermal expansion and a second layer having a second coefficient of thermal expansion, the display module being disposed behind the front cover; A driving unit for driving the display module; And a rear cover surrounding the rear surface of the display module and the driving unit.

Here, the first layer is located on the front side of the front cover, the second layer is located on the back side of the front cover, and the first coefficient of thermal expansion is preferably greater than the second coefficient of thermal expansion.

In addition, the first layer and the second layer of the front cover may be adhered or glued.

In addition, the second layer may be a film formed of polyethylene terephthalate-based resin, the difference in thermal expansion coefficient of the first layer and the second layer is 3 * 10 ^-6 m / mK to 7 * 10 ^-6 m / mK Can be.

Alternatively, the first layer and the second layer of the front cover have the same thickness, the first layer and the second layer may be injection compression molding, the difference in the coefficient of thermal expansion of the first layer and the second layer Preference is given to 1.5 * ^10-6 m / mK to 3 * ^10-6 m / mK.

In addition, the difference in thermal expansion coefficient of the first layer and the second layer is preferably 2.0 * 10 ^-6 m / mK to 2.2 * 10 ^-6 m / mK.

In addition, the first layer may be formed of glass or transparent resin.

In addition, the first layer may be formed of a polycarbonate resin.

In addition, the first layer may be injection compression molded.

In addition, the display device according to an aspect of the present invention may further include a mounting member having one end portion coupled to a rear surface of the front cover and the other end portion supporting one end portion of the display module.

In addition, the mounting member is attached to the rear surface of the front cover, at least one bracket formed with a plurality of boss holes; And a fastening hole is formed in a position corresponding to the boss hole is fastened to the bracket, may include a supporter for supporting one end of the display module.

The mounting member may further include a middle cover that surrounds an outer surface of the bracket and a partial region is exposed to the outside of the front cover, and a fastening hole is formed at a position corresponding to the boss hole of the bracket to be fastened to the bracket. can do.

As described above, the display device according to the present invention can prevent deformation of the appearance design generated as the internal temperature of the product increases due to application of power.

In addition, the display device related to the present invention is another object of the present invention can prevent the screen attachment phenomenon of the front cover can be produced excellent design.

In addition, the display device according to the present invention can maintain a high quality display quality regardless of a change in the internal temperature of the product.

Hereinafter, a display device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings show exemplary forms of the present invention, which are provided to explain the present invention in more detail, and the technical scope of the present invention is not limited thereto.

In addition, irrespective of the reference numerals, the same or corresponding components will be given the same reference numerals, and redundant description thereof will be omitted. For convenience of description, the size and shape of each component may be exaggerated or reduced. have.

On the other hand, terms including ordinal numbers such as first or second may be used to describe various components, but the components are not limited by the terms, and the terms refer to one component to another component. It is used only for the purpose of distinguishing it from.

FIG. 1 is a perspective view illustrating a display device 1 according to an exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view of main parts taken along a line A-A 'of FIG. 1.

The display device 1 according to an embodiment of the present invention forms an appearance and includes a case in which a predetermined space is formed.

The case is coupled to the front cover 100 having the display area 101 and the non-display area 102 and the front cover 100 directly or through a separate mounting member, and is disposed between the front cover 100 and the front cover 100. And a rear cover 50 forming a space part.

In addition, disposed behind the front cover 100, and includes a display module 30 for implementing an image, and is electrically connected to the display module 30, the image, sound and A driver for controlling communication (printed circuit board 60) and a speaker module (not shown) for outputting sound may be included.

The display module 30 may include a cathode ray tube (CRT), an electroluminescent device (EL), a light emitting diode (LED), a vacuum fluorescence display (VFD), and an electric field. Emissive or light-receiving modules, such as a field emission display (FED), a plasma display panel (PDP), a liquid crystal display (LCD), and the like, may be included. The display device 1 may be embodied in various kinds of video display devices such as a television or a monitor.

1 to 3, the front cover 100 includes a display area 101 for displaying an image to the outside and a non-display area 102 formed translucent or opaque so that the image is not displayed to the outside. It may include.

Here, the display area 101 and the non-display area 102 of the front cover 100 may be divided in various ways. In one embodiment, the display area 101 may be formed of a plate formed of transparent resin or glass. The non-display area 102 may be formed by printing a translucent or opaque ink or film on one edge portion of the plate.

In addition, the front cover 100 may perform a function of correcting optical characteristics of the display image displayed from the display module 30 or shielding electromagnetic waves or near infrared rays, and for this purpose, the front cover 100 includes a plurality of functional layers. This can be stacked.

Hereinafter, the assembly method and the mounting members 20 and 40 of each component constituting the display device 1 will be described in detail.

Referring to FIG. 2, the mounting member is adhered to the rear surface of the non-display area 102b of the front cover 100, and the one or more brackets 20 and the boss holes 21 in which a plurality of boss holes 21 are formed. The fastening hole 41 is formed at a position corresponding to the fastening hole 41 and is fastened to the bracket 20, and may include a supporter 40 supporting one end of the display module 30.

In addition, a fastening hole 51 is formed at a position corresponding to the boss hole 21 of the bracket 20 in the rear cover 50, and the rear cover 50 is a screed through the fastening hole 51. The display module 30 is fastened to the bracket 20 through the flow S, and disposed in the space between the front cover 100 and the rear cover 50.

The bracket 20 may have a bar-type structure extending in the longitudinal direction, and the plurality of brackets 20 may have a predetermined interval on the rear surface of the non-display area 102 of the front cover 100. It may be attached or adhered to each other in a spaced state.

As shown in FIG. 2, each component constituting the display device 1 may be assembled through the bracket 20, and the bracket 20 may be prevented from being exposed to the outside. Is adhered or adhered to the rear surface of the non-display area 102 of the front cover 100.

In addition, the support 40 has a fastening hole, a support part which is seated in the opening of the boss hole 21 and a support part which supports one end of the display module 30, and a connection part which connects the fastening part and the support part. It may include, and may be formed to have a variety of structures capable of performing such a function.

In addition, an adhesive layer (not shown) may be formed between the supporter 40 and one end of the display module 30 so as to be attached or adhered to each other, and a cushion member (not shown) may be inserted.

In addition, the mounting member surrounds the outer surface of the bracket 20 and a partial region is exposed to the outside of the front cover 10, the fastening hole is formed at a position corresponding to the boss hole 21 of the bracket 20 It may further include a middle cover (not shown) that is fastened to the bracket 20.

The middle cover may have a variety of structures surrounding the outer surface of the bracket 20 to produce a beautiful appearance, and a partial region may be exposed to the outside of the front cover, and a gradient effect through the exposed region. Various appearance effects can be produced.

On the other hand, as shown in Figure 2, the supporter 40 and the back cover 50 can be fastened together in the same boss hole 21, thereby simplifying the assembly process can reduce the assembly time and cost have.

Hereinafter, the front cover 100 constituting the display device 1 according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram illustrating an operation state of a display apparatus according to a first embodiment of the present invention, and FIGS. 4 and 5 are block diagrams illustrating another operation state of a display apparatus according to a second embodiment of the present invention. 6 is a block diagram showing an operation state of another display device for comparing the display device according to the present invention, and for convenience, only the display area of the front cover 100 is shown.

2 to 5, the front cover 100 has a display area and a non-display area, and has a first layer 110 having a first thermal expansion coefficient and a rear surface of the display area of the first layer 110. And second layers (120, 130) having a second coefficient of thermal expansion that is less than the first coefficient of thermal expansion of the first layer (110).

In addition, the second layers 120 and 130 may be coupled to the rear surface of the display area of the first layer 110, and may be attached or adhered to the entire area of the rear surface including the display area of the first layer 110. It may be.

The formation method of the display area 101 and the non-display area 102 of the first layer 110 is the same as the method described above.

The first layer 110 may be formed of transparent resin, glass, or the like, and the first layer 110 may be formed on the base substrate of tempered glass material to satisfy the strength condition according to the enlargement of the front cover 100. The film may be laminated, or may be made of various materials such as a transparent resin material.

That is, any kind of material that is transparent and satisfies a predetermined level of strength may be used, and the present invention is not limited thereto.

In addition, the first layer 110 may perform a function of correcting optical characteristics of the display image displayed from the display module 30 or shielding electromagnetic waves or near infrared rays, and for this purpose, the front cover 21 has a plurality of functions. Layers can be stacked.

More specifically, the first layer 110 has a color correction and color purity enhancement film (EMI shielding film, NIR blocking film, orange color, etc.) according to the characteristics of the display module 30 Adjusting film, an impact absoption film, and an antireflection film (AR / anti-reflection film) for preventing image deterioration due to reflection of external light on the screen surface may be further adhered or adhered. .

For example, the AR film is attached to the front of the base substrate made of a transparent resin material to prevent the reflection of light incident from the outside to reduce the glare phenomenon, and to shield the near infrared radiation emitted from the display module on the back A NIR shielding layer may be formed to allow signals transmitted using infrared rays to be normally transmitted, such as a remote controller.

The electromagnetic shielding film shields EMI (Electromagnetc Interference) to prevent the emission of electromagnetic waves emitted from the display module to the outside, a plurality of conductive layers, for example, a plurality of reflective layers and conductive transparent layers are alternately stacked It may have a structure.

In this case, the first layer 110 and each functional film may be laminated in various orders.

Hinping, the first layer 110 may be formed of various resins that are transparent, excellent in durability, and low in moisture permeability, and may be formed of, for example, polycarbonate (PC) -based resin, It may further include an antireflection layer and a hard coating layer.

Until now, a case in which a separate functional film is attached to the first layer 110 as a method of correcting optical characteristics of the display module 30 has been described. However, the present invention is not limited thereto, and the first layer 110 may be formed. Of course, by adding a plurality of additives to the resin slurry can correct the optical properties of the display module 30 without a separate functional film.

Hereinafter, the case where the first layers 110 and 200 are formed of polycarbonate (PC) resin will be described as an example.

FIG. 6A illustrates the first layer 200 and the display module 30 before the display apparatus is operated (external power is not applied), and FIG. 6B illustrates the process of operating the display apparatus (external power supply). The first layer 200 and the display module 30 in the application).

Referring to FIG. 6B, when power is applied to the display device, each component of the display device operates to generate heat. In particular, heat emitted from the display module 30 is transferred to the first layer 200 of the front cover as it is, and the first layer 200 is heated by the heat.

At this time, a temperature difference occurs between the inner surface portion 202 facing the display module 30 of the first layer 200 and the outer surface portion 201 exposed to the outside according to the distance from the display module 30.

Accordingly, the thermal expansion amounts of the inner surface portion 202 and the outer surface portion 201 of the first layer 200 are different, and the displacement of the inner surface portion 202 of the first layer 200 is greater than the displacement of the outer surface portion 201. do.

As a result, since the edge portion of the first layer 200 is fixedly coupled to the rear cover, the first layer 200 is bent from the outer surface portion 201 to the inner surface portion 202 and contacts the display module 30. That is, the screen attachment phenomenon occurs.

When the screen attachment phenomenon of the front cover occurs, the display quality of the display device is degraded, and defects in the product are generated.

In order to prevent such a screen attachment phenomenon, the second layers 120 and 130 are coupled to the rear surface of the display area in the first layer 110 of the front cover according to the present invention.

On the other hand, the first layer 110 of the front cover 100 according to the present invention is injected injection molding (ICM: Injection Compression Molding) method after a certain amount of polycarbonate resin is injected through the gate of the mold having a predetermined molding space It is preferably formed as.

Injection extrusion may improve the flatness of the first layer 110 which is directly related to the display quality, increase light transmittance, and manufacture a flat plate having a large size.

The temperature difference between the inner surface portion and the outer surface portion of the first layer 110 of the front cover is about 4 ° C on average, that is, the temperature of the inner surface portion is about 4 ° C higher than the temperature of the outer surface portion.

In consideration of the temperature difference between the inner surface portion and the outer surface portion of the first layer 110 and the material and size of the first layer 110, the thermal expansion coefficients of the second layers 120 and 130 may be variously determined.

3 is a block diagram showing an operation state of a display apparatus according to a first embodiment of the present invention. FIG. 3 (a) shows the display module 30 and the front cover before operation, and FIG. Denotes the display module 30 and the front cover after operation.

The second layer 120 according to the present embodiment may be formed of a transparent, high heat resistant resin so that light can be transmitted smoothly, but is not limited thereto. For example, polyethylene terephthalate (PET) It may be formed of a film based or poly methacrylate (PMMA: Poly Methyl Meta Acrylate) film.

Here, when the second layer 120 is formed of polyethylene terephthalate resin, the transparency is high, the light generated from the display module 30 can be easily emitted to the outside, the heat resistance is good.

When the second layer 120 is formed of polyethylene terephthalate-based resin, the difference in thermal expansion coefficient of the first layer 110 and the second layer 120 is 3 * 10 ^-6 m / mK to 7 * 10 It is preferably ^-6 m / mK, more preferably about 5 * 10 ^-6 m / mK.

That is, it is preferable that the second coefficient of thermal expansion of the second layer 120 is smaller by 3 * 10 ⁻⁶ m / mK to 7 * 10 ⁻⁶ m / mK than the first coefficient of thermal expansion of the first layer 110. More preferably, as small as 5 * 10 ^-6 m / mK.

Here, the first and second thermal expansion coefficients are coefficients of thermal expansion (CTE) and represent linear expansion coefficients.

When the second coefficient of thermal expansion of the second layer 120 is smaller than the numerical range, the difference between the coefficients of thermal expansion between the inner surface portion 112 of the first layer 110 and the second layer 120 is small, so that the first layer ( Since the displacement of the inner surface portion 112 of the 110 may not be adjusted, the screen attachment phenomenon of the front cover may occur.

On the contrary, when the value is larger than the numerical range, the difference between the coefficients of thermal expansion of the inner surface portion 112 and the second layer 120 of the first layer 110 is increased, so that the inner surface portion 112 of the first layer 110 may be increased. Since the displacement is smaller than the displacement, the first layer 110 has a convex shape from the inner surface portion 112 toward the outer surface portion 111, and if it is severe, the appearance quality may be degraded.

4 and 5 are block diagrams showing still another operation state of the display apparatus according to the second embodiment of the present invention, and (a) of each figure shows the display module 30 and the front cover before operation, ( b) shows the display module 30 and the front cover after operation.

The second layer 130 according to the present embodiment may have the same area and thickness as the first layer 110, and the second layer 130 may be formed by injection extrusion.

As described above, the first layer 110 of the front cover 100 injects a predetermined amount of polycarbonate resin through a gate of a mold having a predetermined molding space, and then, by injection extrusion molding (ICM) method. It is preferably formed.

Therefore, since the same mold can be used by having the same area and thickness as that of the first layer 110, the second layer 130 can reduce manufacturing costs for manufacturing a separate mold, and only input raw materials It is easy to mass production because it can be changed.

In particular, since the mold and the injection molding machine are expensive, a problem arises in that the manufacturing cost increases when manufactured separately.

In addition, the second layer 130 may be formed of a polycarbonate resin, but the difference between the first thermal expansion coefficient of the first layer and 1.5 * 10 ⁻⁶ m / mK to 3 * 10 ⁻⁶ m / mK It is preferably formed of a polycarbonate-based resin having a second coefficient of thermal expansion having, and a first having a difference between the first coefficient of thermal expansion of the first layer and 2.0 * 10 ^-6 m / mK to 2.2 * 10 ^-6 m / mK More preferably, it is formed of a polycarbonate resin having a coefficient of thermal expansion.

That is, the second layer 130 is formed of a polycarbonate resin having a second coefficient of thermal expansion that is 1.5 * 10 ⁻⁶ m / mK to 3 * 10 ⁻⁶ m / mK smaller than the first coefficient of thermal expansion of the first layer. It is preferable that it is formed with the polycarbonate resin which has a 2nd coefficient of thermal expansion smaller by 2.0 * 10 <^-6> m / mK to 2.2 * 10 <^-6> m / mK than the 1st thermal expansion coefficient of a 1st layer.

4 and 5, when the coefficient of thermal expansion of the second layer 130 is smaller than the numerical range, the difference between the coefficients of thermal expansion of the inner surface of the first layer 110 and the second layer 130 is small. Since the displacement of the inner surface portion of the first layer 110 may not be adjusted, the screen attachment phenomenon of the front cover may occur.

On the contrary, when the value is larger than the numerical range, the difference between the thermal expansion coefficients of the inner surface portion of the first layer 110 and the second layer 130 becomes large so that the displacement is smaller than the displacement of the inner surface portion of the first layer 110. Therefore, the first layer 110 has a convex shape from the inner surface portion toward the outer surface portion, and in severe cases, the appearance quality may be degraded.

In addition, the front filter 100 may be manufactured by combining the first layer 110 and the second layer 130 formed by an injection extrusion method through an adhesive or adhesive layer.

As described above, the display device related to the present invention can prevent deformation of the appearance design that may be generated as the internal temperature of the product increases due to the application of power.

In addition, the display device related to the present invention is another object of the present invention can prevent the screen attachment phenomenon of the front cover can be produced excellent design.

In addition, the display device according to the present invention can maintain a high quality display quality regardless of a change in the internal temperature of the product.

Preferred embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art having various ordinary knowledge of the present invention may make various modifications, changes, and additions within the spirit and scope of the present invention. And additions should be considered to be within the scope of the following claims.

1 is a perspective view showing a display device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the main part structure of the state cut along the line A-A 'of FIG. 1; FIG.

3 is a block diagram showing an operating state of a display device according to a first embodiment of the present invention;

4 and 5 are block diagrams showing still another operation state of the display apparatus according to the second embodiment of the present invention.

6 is a block diagram showing an operation state of another display device for comparing the display device related to the present invention.

Claims (14)

Front cover; The front cover includes a first layer having a first coefficient of thermal expansion and a second layer having a second coefficient of thermal expansion, A display module disposed behind the front cover; A driving unit for driving the display module; And And a rear cover surrounding the rear surface of the display module and the driving unit. The method of claim 1, And the first layer is located on the front side of the front cover, the second layer is located on the back side of the front cover, and the first thermal expansion coefficient is greater than the second thermal expansion coefficient. The method of claim 1, And a first layer and a second layer of the front cover. The method of claim 2, The second layer is a display device, characterized in that the film formed of polyethylene terephthalate-based resin. The method of claim 4, wherein The difference between the thermal expansion coefficients of the first layer and the second layer is 3 * 10 ^-6 m / mK to 7 * 10 ^-6 m / mK. The method of claim 2, And the first layer and the second layer of the front cover have the same thickness, and the first layer and the second layer are injection compression molded. The method of claim 6, The difference between the coefficient of thermal expansion of the first layer and the second layer is a display device, characterized in that 1.5 * 10 ^-6 m / mK to 3 * 10 ^-6 m / mK. The method of claim 6, The difference between the coefficient of thermal expansion of the first layer and the second layer is a display device, characterized in that 2.0 * 10 ^-6 m / mK to 2.2 * 10 ^-6 m / mK. The method of claim 1, And the first layer is formed of glass or transparent resin. The method of claim 9, The first layer is a display device, characterized in that formed of polycarbonate resin. The method of claim 1, And the first layer is injection compression molded. The method of claim 1, One end portion is coupled to the rear surface of the front cover, and the other end portion further comprises a mounting member for supporting one end of the display module. The method of claim 12, wherein the mounting member, At least one bracket adhered to a rear surface of the front cover and having a plurality of boss holes formed therein; And And a supporter formed at a position corresponding to the boss hole to be fastened to the bracket and supporting one end of the display module. 13. The method of claim 12, The mounting member may include a middle cover surrounding the outer surface of the bracket and a partial region is exposed to the outside of the front cover, and a fastening hole is formed at a position corresponding to the boss hole of the bracket to be fastened to the bracket. Display device characterized in that.

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