KR20070010577A - Display device - Google Patents

Abstract

A display device having a sound output function is disclosed. The display device includes a display assembly, a film speaker, and a vibration active layer. The display assembly includes a backlight assembly for emitting light, a panel assembly for displaying an image using light, and a storage container for storing the backlight assembly and the panel assembly. The film speaker is disposed on one surface of the display assembly to output sound. The vibration active layer is interposed between one surface of the display assembly and the film speaker. Accordingly, by attaching the film speaker to one surface of the display assembly, and interposing the vibration active layer between the one surface and the film speaker, it is possible to reduce the thickness and the light quality of the product.

Description

Display device {DISPLAY DEVICE}

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

FIG. 2 is a schematic cross-sectional view of the illustrated display device of FIG. 1.

FIG. 3 is a block diagram illustrating a driving method of the film speaker illustrated in FIG. 1.

4A and 4B are process diagrams for describing a forming method according to an exemplary embodiment of the vibrating active layer illustrated in FIG. 1.

5A and 5B are process diagrams for describing a forming method according to another exemplary embodiment of the vibrating active layer illustrated in FIG. 1.

FIG. 6 is a flowchart illustrating a method of forming a vibrating active layer according to still another embodiment of FIG. 1.

7 is a cross-sectional view of a display device according to another exemplary embodiment of the present invention.

8 is a cross-sectional view of a display device according to still another embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

100: storage container 210: light source

220: flexible printed circuit board 230: light guide plate

240: reflector 250: backlight assembly

260: mold frame 270: brightness enhancement unit

280: display panel module 310: sound source output unit

320: film speaker 330: vibration active layer

The present invention relates to a display device, and more particularly, to a display device having a sound output function.

In general, the display device includes a CRT, a PDP, an LCD, and an LED. In recent years, liquid crystal displays (LCDs) having light weight and miniaturization characteristics have been widely used, ranging from portable terminals to large televisions, according to consumer preferences.

Compared with the lighter and smaller display device as described above, the acoustic device employs a magnet-driven speaker using a magnet, a coil, and a diaphragm. However, the speaker of the magnetic drive method has a limitation in miniaturization and light weight. That is, when the size of the magnet is reduced or the thickness of the diaphragm is reduced to achieve miniaturization and light weight, the sound quality is deteriorated.

Accordingly, there is a demand for the development of an acoustic device suitable for a liquid crystal display (LCD) having disadvantages of miniaturization and light weight.

Accordingly, the technical problem of the present invention has been conceived in this respect, and an object of the present invention is to provide a display device for achieving light and small size at the same time having a sound output function.

A display device according to an exemplary embodiment for realizing the object of the present invention includes a display assembly, a film speaker, and a vibration active layer. The display assembly includes a backlight assembly emitting light, a panel assembly displaying an image using the light, and a storage container accommodating the backlight assembly and the panel assembly. The film speaker is disposed on one surface of the display assembly to output sound. The vibration active layer is interposed between one surface of the display assembly and the film speaker.

A display device according to another embodiment for realizing the above object of the present invention includes a display assembly and a film speaker. The display assembly includes a backlight assembly emitting light, a panel assembly displaying an image using the light, and a storage container accommodating the backlight assembly and the panel assembly. The film speaker is disposed on one surface of the display assembly and includes a vibration active layer formed to face the one surface.

According to such a display device, by attaching a film speaker to one surface of a display assembly and interposing a vibrating active layer between the one surface and the film speaker, it is possible to reduce the thinness and the sound quality of the product.

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

1 is a perspective view of a display device according to an exemplary embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the illustrated display device of FIG. 1.

1 and 2, the display device includes a display assembly 200, a sound source output unit 310, a film speaker 320, and a vibration active layer 330.

The display assembly 200 includes a storage container 201, a backlight assembly 250, a panel assembly 290, a sound source output unit 310, a film speaker 320, and a vibration active layer 330.

The storage container 201 has a storage space defined by a bottom surface and sidewalls each extending from an edge of the bottom surface. A locking groove 201a is formed in some of the sidewalls.

The backlight assembly 250 generates light and includes a light source 210, a flexible printed circuit board 220, a light guide plate 230, and a reflective plate 240.

The light source 210 generates light, and the light source 210 uses, for example, a plurality of light emitting diodes (LEDs). The light source 210 may be disposed on one side of the light guide plate 230, may be disposed under the light guide plate 230, and may be disposed on both side surfaces of the light guide plate 230.

The flexible printed circuit board 220 has the light source 210 mounted thereon, and a circuit pattern for providing a driving signal to the light source 210 is formed. Here, the light source 210 is illustrated as being mounted on the flexible printed circuit board 220, but is not limited thereto and may be variously formed.

The light guide plate 230 guides the path of the light incident from the light source 210 in a predetermined direction and emits the light. The light guide plate 230 is formed with a dot pattern for controlling the light path. The dot pattern may be printed or molded by a mold, and may be formed in various ways.

The reflection plate 240 reflects the light leaked from the light guide plate 230 back to the light guide plate 230 to improve light utilization efficiency. Although a plate shape having a predetermined thickness is illustrated here as an example, it may have a sheet shape.

The panel assembly 290 is disposed on the backlight assembly 250 to display an image using the light. The panel assembly 290 includes a mold frame 260, a brightness enhancing unit 270, and a display panel module 280.

The mold frame 260 guides the flexible printed circuit board 220 and the light guide plate 230 to which the brightness enhancing unit 270 disposed above is mounted, and is disposed below. A locking jaw 261 is formed on the sidewall of the mold frame 260.

The locking jaw 261 is engaged with the locking groove 201a formed on the sidewall of the storage container 201 so that the mold frame 260 and the storage container 201 are fastened. As a result, the backlight assembly 250 accommodated in the storage container 201 is fixed.

The brightness enhancing unit 270 includes a diffusion member and a plurality of optical sheets and is mounted on the mold frame 260. The brightness enhancing unit 270 converts the light emitted from the backlight assembly 250 to have a uniform brightness distribution and provides the same to the display panel module 280.

The display panel module 280 displays an image using electrical and optical characteristics. The display panel module 280 includes a display panel 283, a driving chip 284, and a flexible printed circuit board 285.

The display panel 283 includes a liquid crystal layer formed between two substrates. For example, a thin film transistor (hereinafter, referred to as TFT) substrate 281, a color filter substrate 282 coupled to the TFT substrate 281, and the TFT substrate 281 and the color filter. And a liquid crystal layer (not shown) injected between the substrates 282.

The driving chip 284 is mounted on one side of the TFT substrate 281, and outputs a driving signal to the display panel 283. The driving signal includes a data signal, a gate control signal, and a data control signal. The driving chip 284 may include other driving chips other than the data driving chip, or may be configured as a single chip. The driving chip 284 is mounted on one side of the TFT substrate 281 by a chip on glass (COG) process.

The flexible printed circuit board 285 is mounted on one side of the TFT substrate 281 to provide a data signal and a control signal provided from the outside to the driving chip 284. The flexible printed circuit board 285 is generally electrically connected to the TFT substrate 281 via an anisotropic conductive film (ACF).

The sound source output unit 310 converts the first sound source signal provided from an external device into a second sound source signal for driving the film speaker 320 and outputs it to the film speaker 320.

The film speaker 320 is disposed below the accommodating container 201, and includes a piezoelectric film 321 and a first metal electrode 322 and the piezoelectric film formed on the first surface of the piezoelectric film 321. And a second metal electrode 323 formed on the second surface of 321.

The piezoelectric film 321 emits sound waves by converting a second sound source signal, which is an electrical signal, into mechanical vibrations. The piezoelectric film 321 is formed of polyvinylidenfluoride (PVDF) and derivatives thereof. In addition, it may be formed by selecting from a group consisting of PVDF-HFP polymer mixture (blend) and VDF / TrFE (Vinylidenefluoride / Trifluorethylene) containing an additive such as HFP (hexafluoropropylene).

A second sound source signal output from the sound source output unit 310 is applied to the first and second metal electrodes 322 and 323 to drive the piezoelectric film 321 to emit sound waves. The first and second metal electrodes 322 and 323 are coated on the first and second surfaces of the piezoelectric film 311 by a metal material or a transparent conductive material.

The vibration active layer 330 is a transparent adhesive layer made of an elastic material including a bubble layer or an embossing layer having an air layer for activating vibration of the film speaker 320, and a spacer. The vibration active layer 330 is formed between one surface of the storage container 201 to which the film speaker 320 is attached and one surface of the film speaker 320 opposite to one surface of the storage container 201.

Therefore, vibration is activated on the first surface of the film speaker 320 attached to the storage container 201 by the vibration active layer 330. Of course, the second surface of the film speaker 320 is also disposed adjacent to the air gap of a certain gap.

FIG. 3 is a block diagram illustrating a driving method of the film speaker illustrated in FIG. 1.

Referring to FIG. 3, the sound source output unit 310 includes an input unit 311, an amplifier 312, and a converter 313. The output signal of the converter 313 is input to the first and second metal electrodes 322 and 323 of the film speaker 320.

The input unit 311 receives a first sound source signal input from an external device. The amplifier 312 amplifies and outputs the first sound source signal to a predetermined level. The transformer 313 converts the amplified first sound source signal into a second sound source signal and outputs the second sound source signal. Specifically, the second sound source signal is a boosted voltage for driving the film speaker 320.

The second sound source signal is output to the film speaker 320 through input terminals connected to the first and second metal electrodes 312 and 313 of the film speaker 320, respectively, through the output terminal of the converter 313. Is approved.

As the film speaker 320 receives a second sound source signal to the first and second metal electrodes 312 and 313, the piezoelectric film 321 vibrates to emit corresponding sound waves.

4A and 4B are process diagrams for describing a forming method according to an exemplary embodiment of the vibrating active layer illustrated in FIG. 1.

4A and 4B, a synthetic resin 331 is coated on the first metal electrode 311 of the film speaker 320.

Thereafter, the synthetic resin 311 is pressed using a mold 430 having an embossed intaglio. As a result, a vibrating active layer 332 having a raised embossed shape is formed.

The synthetic resin 331 is an acrylic ultraviolet curable resin, and photopolymerizable monomers such as acrylates, epoxy acrylates, polyester acrylates, urethane acrylates, oligomers, acetophenones, benzophenones, and thikes It includes a santon system.

As a result, the vibrating active layer 332 has a convex embossed shape and a certain area is convex, and an air layer a is formed in the concave portion.

5A and 5B are process diagrams for describing a forming method according to another exemplary embodiment of the vibrating active layer illustrated in FIG. 1.

5A and 5B, a synthetic resin 341 is coated on the first metal electrode 311 of the film speaker 320. Thereafter, the synthetic resin 341 is patterned using the mask 440 having the opening pattern formed thereon to remove the synthetic resin 341 in a partial region.

As a result, the vibration active layer 342 is formed of a convex portion in which the synthetic resin 341 remains and a concave portion from which the synthetic resin 341 is removed, and an air layer a is formed in the concave portion.

The synthetic resin 341 is an acrylic UV curable resin, and includes photopolymerizable monomers such as acrylates, epoxy acrylates, polyester acrylates, and urethane acrylates, oligomers, acetophenones, benzophenones, and thikes. It includes a santon system.

FIG. 6 is a flowchart illustrating a method of forming a vibrating active layer according to still another embodiment of FIG. 1.

Referring to FIG. 6, the vibrating active layer 353 is formed by applying the transparent adhesive 352 including the spacer 351 on the first metal electrode 311 of the film speaker 320. The transparent adhesive 352 is an elastic material that is linked to the vibration of the film speaker 320.

That is, the spacer 351 maintains a gap between the film speaker 320 and the display device, and the transparent adhesive 352 activates vibration of the film speaker 320 by elasticity.

7 is a cross-sectional view of a display device according to another exemplary embodiment of the present invention. Hereinafter, the same components as those of the display device illustrated in FIG. 1 will be described with the same reference numerals, and detailed descriptions of the same components will be omitted.

Referring to FIG. 7, the display device includes a display assembly (not shown), a sound source output unit (not shown), a film speaker 520, and a vibration active layer 530. The display assembly (not shown) includes a storage container 201, a backlight assembly 250, and a panel assembly 290.

The storage container 201 has a storage space and accommodates the backlight assembly 250 and the panel assembly 290. The backlight assembly 250 emits light toward the panel assembly 290. The panel assembly 290 displays an image using electrical and optical characteristics.

The film speaker 520 is disposed on one sidewall of the storage container 201.

The film speaker 520 may include a first metal electrode 522 formed on a piezoelectric film 521 and a first surface of the piezoelectric film 521, and a second metal electrode formed on a second surface of the piezoelectric film 521. 523).

The piezoelectric film 521 emits sound waves by converting the second sound source signal output from the sound source output unit (not shown) into mechanical vibration. The piezoelectric film 321 is preferably formed of polyvinylidene fluoride (PVDF) and derivatives thereof.

A second sound source signal output from the sound source output unit (not shown) is applied to the first and second metal electrodes 522 and 523, and the second sound source signal drives the piezoelectric film 521. The first and second metal electrodes 522 and 523 are coated on the first and second surfaces of the piezoelectric film 511 with a metal material or a transparent conductive material.

The vibration active layer 530 is a transparent adhesive layer made of an elastic material including a bubble layer or an embossing layer having an air layer for activating vibration of the film speaker 520, and a spacer. The vibration active layer 530 is formed between one sidewall of the display device to which the film speaker 520 is attached and one surface of the film speaker 520 disposed to face one sidewall of the display device.

Accordingly, vibration of the first surface of the film speaker 520 attached to the sidewall of the display device is activated by the vibration active layer 530. Of course, the second surface of the film speaker 520 is also disposed adjacent to the air gap of a certain gap.

8 is a perspective view of a display device according to still another embodiment of the present invention. Hereinafter, the same components as those of the display device illustrated in FIG. 1 will be described with the same reference numerals, and detailed descriptions of the same components will be omitted.

Referring to FIG. 8, the display device includes a display assembly 200, a sound source output unit 610, a film speaker 620, and a vibration active layer 630. The display assembly 200 includes a storage container 201, a backlight assembly 250, and a panel assembly 290.

The sound source output unit 610 converts a first sound source signal provided from an external device into a second sound source signal for driving the film speaker 620 and outputs it to the film speaker 620.

The film speaker 620 is disposed on the display panel 283, and the piezoelectric film 621 and the first metal electrode 622 and the piezoelectric film 621 formed on the first surface of the piezoelectric film 621. It includes a second metal electrode 623 formed on the second surface of the.

The piezoelectric film 621 emits sound waves by converting a second sound source signal, which is an electrical signal, into mechanical vibrations. The piezoelectric film 621 is formed of polyvinylidenfluoride (PVDF) and derivatives thereof. In addition, it may be formed by selecting from a group consisting of PVDF-HFP polymer mixture (blend) and VDF / TrFE (Vinylidenefluoride / Trifluorethylene) containing an additive such as HFP (hexafluoropropylene).

A second sound source signal output from the sound source output unit 610 is applied to the first and second metal electrodes 622 and 623 to drive the piezoelectric film 621 to emit sound waves. The first and second metal electrodes 622 and 623 are preferably coated on the first and second surfaces of the piezoelectric film 611 with a transparent conductive material. The transparent conductive material may be Indium-Tin-Oxide (ITO), Indium-Zinc-Oxide (IZO) or Indium-Tin-Zinc-Oxide ).

The vibration active layer 630 is a transparent adhesive layer made of an elastic material including a bubble layer or an embossing layer having an air layer for activating vibration of the film speaker 620, and a spacer. The vibration active layer 630 is formed between one surface of the display panel 283 to which the film speaker 620 is attached and one surface of the film speaker 620 opposite to one surface of the display panel 283. Here, the vibration active layer 630 is preferably formed of a transparent material.

Accordingly, vibration of the first surface of the film speaker 620 attached to the display panel 283 is activated by the vibration active layer 630. Of course, the second surface of the film speaker 620 is also disposed adjacent to the air layer.

Although not shown, the film speaker may be attached to various parts of the display device including a vibration active layer. For example, when the display device is applied to a portable terminal, the display device may be attached to a case, a protective glass, a keypad and a battery of the portable terminal.

As described above, according to the present invention, by attaching a film speaker to one surface of the display device through the vibration active layer, weight reduction and miniaturization of a product to which the display device is applied can be achieved. In addition, the sound active and the sound quality of the film speaker can be improved by the vibration active layer.

Although described above with reference to the embodiments, those skilled in the art can be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below. I can understand.

Claims (9)

A display assembly including a backlight assembly emitting light, a panel assembly displaying an image using the light, and a storage container accommodating the backlight assembly and the panel assembly; A film speaker disposed on one surface of the display assembly to output sound; And And a vibration active layer interposed between one surface of the display assembly and the film speaker. The display device of claim 1, wherein the vibration active layer comprises an air layer. The display device of claim 2, wherein the vibration active layer comprises a convex portion for supporting one surface of the display assembly, a film speaker, and a concave portion in which the air layer is formed. The display device of claim 1, wherein the vibrating active layer comprises a spacer supporting one surface of the display assembly, a film speaker, and a pressure-sensitive adhesive. The display device of claim 1, wherein the film speaker is disposed on a bottom surface of the storage container. The display device of claim 1, wherein the film speaker is disposed on a sidewall of the storage container. The display panel of claim 1, wherein the panel assembly comprises a display panel including a first substrate, a second substrate facing the first substrate, and a liquid crystal layer interposed between the first and second substrates. And the film speaker is disposed on the display panel. The method of claim 1, wherein the film speaker First and second electrodes to which a sound source signal is input; And And a piezoelectric film interposed between the first and second electrodes. A display assembly including a backlight assembly emitting light, a panel assembly displaying an image using the light, and a storage container accommodating the backlight assembly and the panel assembly; And And a film speaker disposed on one surface of the display assembly and including a vibration active layer facing the one surface.

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