KR100759674B1 - Portable display - Google Patents

Abstract

The present invention provides a portable display device including a first display panel displaying an image, a backlight assembly including a light source supplying light to the first display panel, and a bottom chassis for fixing the backlight assembly. The bent vertical piece at the edge of the bottom chassis is formed of a multi-layer hemming portion folded at least two times.

According to the present invention, the bottom chassis has a hemming structure, which improves the strength of the LCD module and improves the rigidity of the portable display device.

Description

Portable Display Device

1 is an exploded perspective view illustrating a backlight assembly and a bottom chassis of a conventional portable display device;

2 is an exploded perspective view showing a portable display device according to a first embodiment of the present invention.

3 is a perspective view of the bottom chassis shown in FIG.

4 is a perspective view showing a second embodiment of a bottom chassis according to the present invention;

♣ Explanation of symbols for the main parts of the drawing ♣

4: first display panel

4a, 4b: substrate 6, 34: integrated circuit

8: protective layer 10,20: optical sheet

12 light emitting diode 14 light emitting diode substrate

16: mold frame 18: light guide plate

20: reflector

24, 26, 32: printed circuit board 30: second display panel

36,38: pad portion 50: backlight assembly

60: portable display device 70: bottom chassis

70a: coupling hole 71: hemming part

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable display device. In particular, a multi-layer hemming unit is formed in a bottom chassis provided in a portable display device to improve strength, thereby improving the strength of the LCD module and improving the rigidity of the product. It relates to a display device.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. The flat panel display includes a liquid crystal display, a field emission display, a plasma display panel, and an organic light emitting display.

Here, the liquid crystal display and the light emitting display have been attracting attention as an alternative means to overcome the disadvantages of the conventional cathode ray tube because of the advantages of miniaturization, light weight and low power, and now mobile phones and PDA (Portable digital assistor) In addition to the portable devices such as, such as monitors and TVs, which are medium and large-sized products, in particular, most of the portable devices such as mobile phones or PDAs are currently employing almost all portable display devices such as liquid crystal displays or light emitting displays. to be.

Since the liquid crystal display is not a device that emits light by itself, a light source for visually representing an image on the back of the liquid crystal display is required. As a light source of such a liquid crystal display, a backlight unit assembly is used.

1 is an exploded perspective view illustrating a backlight assembly and a bottom chassis of a conventional portable display device, wherein the backlight assembly 50 includes a mold frame 16, light emitting diodes 12, a light emitting diode substrate 14, And a light guide plate 18, a reflector plate 20, and optical sheets 10.

Here, the light emitting diodes 12 generate light having a predetermined luminance in response to a driving signal from the light emitting diode substrate 14, and the light guide plate 18 transfers light supplied from the light emitting diodes 12 to the liquid crystal display panel. Supply.

In addition, the reflector 20 is located on the rear surface of the light guide plate 18 to re-inject light incident from the light guide plate 18 to the light guide plate 18. That is, the reflective plate 20 improves the light efficiency by resupplying the light incident on the light guide plate 18, and the first optical sheets 10 improve the brightness of the light supplied from the light guide plate 18. Supply to liquid crystal display panel.

The bottom chassis 22 fixing the liquid crystal display panel is also referred to as a bezel, and is basically configured to be coupled to the lower portion of the mold frame 16. The bottom chassis 22 fixes the backlight assembly 50 and the liquid crystal display panel. Do it.

The conventional bottom chassis 22 is formed by molding a thin metal plate, and bends the edges on both sides upward to form a vertical piece on both sides. The mold frame 16 and the hook Joined or coupled to mold frame 16 by insert injection.

However, such a conventional bottom chassis 22 is a single thin metal plate, so there is a problem of insufficient strength to fix the liquid crystal display panel or the backlight assembly 50, which causes the LCD module including the backlight assembly 50. It became the cause of weakening of the strength.

Accordingly, there is a need to find a structural method for improving the strength of the LCD module and the rigidity of the portable display device including the same.

Accordingly, an object of the present invention is to provide a portable display device capable of improving the strength of an LCD module by applying a hemming structure to a bottom chassis.

In order to achieve the above object, in the present invention, a backlight assembly including a first display panel for displaying an image, a light source for supplying light to the first display panel, and a bottom chassis for fixing the backlight assembly includes: In the portable display device included, the bent vertical piece of the edge of the bottom chassis is formed of a multi-layer hemming portion folded at least two or more times is provided.

The multi-layer hemming part has an outer hemming structure that is folded outwardly and is folded into a four-layer hemming part that is folded three times by folding the end of the bottom vertical piece of the bottom chassis, or by folding the end of the bottom vertical piece of the bottom chassis five times. It can be a nested six-layer hemming.

The multilayer hemming portion can have an inside hemming structure folded inward.

In addition, the multi-layer hemming portion is preferably formed with the same length as the vertical piece height of the bottom chassis.

In addition, the first display panel may be implemented as a liquid crystal display panel.

The first display panel includes a first substrate; A second substrate having a plurality of thin film transistors formed in a display area bonded to the first substrate and an integrated circuit formed in a non-display area not bonded to the first substrate; Liquid crystal injected between the first substrate and the second substrate is included.

In addition, the portable display device of the present invention includes a second printed circuit board connected to an external driving circuit and a pad unit connected to the second printed circuit board to control a light source included in the first display panel and the backlight assembly. And a second display panel connected to the second printed circuit board and displaying an image under the second printed circuit board. In this case, the second display panel may be implemented as an organic electroluminescent display panel.

On the other hand, the bottom chassis is coupled to the mold frame and the hook of the backlight assembly, or by insert injection.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

2 is an exploded perspective view illustrating a portable display device according to a first embodiment of the present invention.

However, this will be described as an example of a dual type display device used in a mobile phone, but this is one embodiment and the present invention is not necessarily limited thereto.

Referring to FIG. 2, a portable display device 60 according to an exemplary embodiment of the present invention includes a first display panel 4, a backlight assembly 50, a bottom chassis 70, and a first printed circuit board. 24, the second printed circuit board 26 and the second display panel 30 are included.

Here, the first display panel 4 displays a predetermined image. In the embodiment of the present invention, the first display panel is configured of a liquid crystal display panel.

The first display panel 4 includes a first substrate 4a, a second substrate 4b, and a liquid crystal (not shown) injected therebetween, and the second substrate 4b has a matrix form. And a plurality of thin film transistors (hereinafter referred to as "TFTs").

However, the source electrode of the TFT is connected to the data line, the gate electrode is connected to the scan line, and the drain electrode of the TFT is connected to the pixel electrode made of transparent indium tin oxide (ITO). Such a TFT is turned on when the scan signal is supplied to the scan line to supply the data signal supplied from the data line to the pixel electrode.

To this end, an integrated circuit 6 is mounted on one side of the second substrate 4b, and a data signal and a scan signal are supplied from the integrated circuit 6. A protective layer 8 is applied around the integrated circuit 6.

In addition, the first substrate 4a of the first display panel 4 is disposed to face the second substrate 4b. The common electrode made of ITO is coated on the front surface of the first substrate 4a. A predetermined voltage is applied to the common electrode, thereby forming a predetermined electric field between the common electrode and the pixel electrode. The arrangement angle of the liquid crystal injected between the first substrate 4a and the second substrate 4b is changed by such an electric field, and the light transmittance is changed according to the changed arrangement angle to display a desired image.

However, since the first display panel 4 is a liquid crystal display panel, a backlight assembly 50 for irradiating light under the panel to display an image should be provided.

The backlight assembly 50 includes a mold frame 16, light emitting diodes 12, a light emitting diode substrate 14, a light guide plate 18, a reflector plate 20, and optical sheets 10.

Here, the light emitting diodes 12 generate light having a predetermined brightness in response to a driving signal from the light emitting diode substrate 14, and the light guide plate 18 receives light supplied from the light emitting diodes 12 from the liquid crystal display panel ( 4) Supply to. That is, the light guide plate 18 supplies the light supplied from its side to the first display panel 4 located above it.

In addition, the reflector 20 is located on the rear surface of the light guide plate 18 to re-inject light incident from the light guide plate 18 to the light guide plate 18. That is, the reflective plate 20 improves the light efficiency by resupplying the light incident on the light guide plate 18, and the first optical sheets 10 improve the brightness of the light supplied from the light guide plate 18. It supplies to the liquid crystal display panel 4.

In addition, the light emitting diode substrate 14 is connected to the first printed circuit board 24, and supplies driving signals to the light emitting diodes 12 in response to a control signal supplied from the first printed circuit board 24. In the mold frame 16, a light emitting diode substrate 14 on which the light emitting diodes 12 are mounted is received and fixed, and the first display panel 4 and the backlight assembly 50 are fixedly supported.

Here, the bottom chassis 70 is fixed to the mold frame 16 by a hook 16a at the bottom of the mold frame 16, and the second display panel 30 is inserted into a central portion of the bottom chassis 70. The opening is formed so that it can be.

The bottom chassis 70 may also be referred to as a bezel, and as shown in the bottom chassis 70, the multi-layer hemming portion 71 may be formed by folding at least two ends of the bent vertical piece of the edge. Structure. Hemming (hemming) structure is a structure that is folded over the end of the plate to increase the rigidity of the product.

The multi-layer hemming portion 71 according to the first embodiment of the present invention has an outside hemming structure that is folded outwardly.

3 is a perspective view of the bottom chassis illustrated in FIG. 2, and as shown therein, a first embodiment of the present invention overlaps a vertical piece bent on both sides of the bottom chassis 70 and folded three times outward. It consists of four layers of hemming part 71 by loading.

Such a hemming portion 71 improves the strength of the bottom chassis 70 and in four layers at the edges of both sides when fixing the mold frame 16 of the first display panel 4 and the backlight assembly 50. By fixing it, the rigidity of the LCD module can be improved.

The bottom chassis 70 of the present invention can be applied to the hook coupling structure is formed by the coupling hole 70a for coupling to the mold frame 16 and the hook 16a, in addition to the insert injection is coupled It can also be applied.

The hemming portion 71 of the present invention is preferably formed with the same length as the vertical piece height of the bottom chassis 70.

Specifically, the equation for calculating the rigidity of the bottom chassis 70 is as shown in [Equation 1] below.

[Equation 1]

Here, the rigidity (K) is proportional to the cube of the width (b) and the height (h) of the product, therefore, by increasing the width and height of the hemming portion 71 of the bottom chassis 70, it is possible to increase the rigidity It is.

Therefore, according to the bottom chassis 70 of the present invention, since the width b is four times thicker than the vertical piece of the conventional bottom chassis 22 by applying the hemming structure, the rigidity K can be greatly improved. .

Substantially, as a result of the applicant's strength test on the first embodiment of the present invention, the hemming portion 71 of the four layers has a strength of 7.73 kgf, while the strength of the folded hemming structure is 3.88 kgf. It was found that the strength was greatly improved with me.

Next, the second printed circuit board 26 receives a driving signal from a cell phone side driving circuit (not shown). To this end, the second printed circuit board 26 has a mobile phone connector 28. The mobile phone connector 28 is fixedly integrated with another connector attached to the mobile phone side driving circuit to receive a driving signal from the mobile phone side driving circuit, and the second printed circuit board 26 supplied with the driving signal is supplied to itself. Various control signals are generated in response to the driving signal.

Accordingly, the first printed circuit board 24 is connected to the second printed circuit board 26 through the first pad part 38 formed on the second printed circuit board 26, which is not shown in the flexible printed circuit board. The FPCB is connected to the integrated circuit 6 and the light emitting diode substrate 14 of the first display panel 4. The first printed circuit board 24 connected to the integrated circuit 6 and the light emitting diode substrate 14 corresponds to the integrated circuit 6 and the light emitting diode in response to control signals supplied from the second printed circuit board 26. It serves to drive the substrate 14.

In addition, in the embodiment of the present invention, the second display panel 30 is implemented as an organic light emitting display panel, and the second display panel 30 includes a first substrate 30a and a second substrate 30b. do.

Accordingly, organic light emitting diodes (not shown) are disposed on the second substrate 30a in a matrix form, and the organic light emitting diodes generate light having a predetermined luminance corresponding to the amount of current supplied thereto. The second display panel 30 is connected to the second printed circuit board 26 by the second pad part 36 of the flexible printed circuit board 32. Here, an integrated circuit 34 is mounted on the flexible printed circuit board 32, and the integrated circuit 34 corresponds to the control signals supplied from the second printed circuit board 26 to display the second display panel 30. ), A predetermined image is displayed.

Here, the integrated circuit 34 of the second display panel 30 is mounted on the flexible printed circuit board 32, and the integrated circuit 34 is connected to the bottom chassis when the portable display device 60 is coupled. The external light, that is, UV is blocked by 70, so that it is not necessary to form a separate light blocking tape on the integrated circuit 34.

As described above, the multi-layer hemming portion 71 is formed on the vertical edge of the bottom chassis 70, thereby improving the strength of the bottom chassis 70, and the first display panel 4 and the backlight assembly 50. When the mold frame 16 of the fixing is to improve the rigidity of the LCD module.

On the other hand, Figure 4 is a perspective view showing a bottom chassis according to a second embodiment of the present invention.

Bottom chassis 80 according to the second embodiment of the present invention is a structure in which a multi-layer hemming portion (hemming) 81 consisting of six layers is formed by folding the end of the vertical piece bent at the edge five times.

In the second embodiment of the present invention, since the width b of the vertical piece of the bottom chassis 22 is six times thicker than that of the conventional bottom chassis, the rigidity K may be greatly improved.

Substantially, as a result of the applicant's strength test on the second embodiment of the present invention, the hemming portion 81 of the six layers has a strength of 9.55 kgf, while the strength of the folded hemming structure is 3.88 kgf. It was found that the strength was greatly improved with me.

On the other hand, the multi-layer hemming portion may be folded inwardly to have a nested inside (INSIDE) hemming structure. In this case, the multilayer hemming portion is preferably formed to have the same length as the height of the vertical piece of the bottom chassis.

As described above, even when the multilayer hemming portion is formed as an inner hemming structure, the strength is greatly improved as compared with the conventional bottom chassis as in the first and second embodiments of the present invention.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

As described above, according to the present invention, by applying a hemming structure to the side surface of the bottom chassis to greatly increase the strength of the LCD module, the rigidity of the portable display device can be improved.

In addition, when the hemming portion is formed by the thickness of the flexible printed circuit board, the problem of the step may be overcome, thereby improving the rigidity of the portable display device.

The present invention can be applied to various coupling structures of the bottom chassis and the mold frame, and there is an effect that can improve the strength through various coupling structures.

Claims (12)

A first display panel for displaying an image, A backlight assembly comprising a light source for supplying light to the first display panel; A portable display device comprising a bottom chassis for fixing the backlight assembly. The bent vertical piece of the edge of the bottom chassis is formed of a multi-layer hemming portion folded at least two times. The method of claim 1, And the multilayer hemming portion has an outside hemming structure folded in an outward direction. The method of claim 2, And the multi-layer hemming portion is a four-layer hemming portion which is folded three times at the end of the vertical edge of the bottom chassis. The method of claim 2, The multi-layer hemming unit is a six-layer hemming unit folded five times by folding the end of the vertical edge of the bottom chassis. The method of claim 1, And the multilayer hemming portion has an inner hemming structure folded inward. The method according to any one of claims 1 to 5, And the multilayer hemming portion has a length equal to a height of a vertical piece of the bottom chassis. The method of claim 1, The first display panel is implemented as a liquid crystal display panel. The method of claim 7, wherein The first display panel includes a first substrate; A second substrate having a plurality of thin film transistors formed in a display area bonded to the first substrate and an integrated circuit formed in a non-display area not bonded to the first substrate; And a liquid crystal injected between the first substrate and the second substrate. The method of claim 1, A second printed circuit board connected to an external driving circuit; A first printed circuit board mounted with a pad part connected to the second printed circuit board and controlling a light source included in the first display panel and the backlight assembly; And a second display panel connected to the second printed circuit board to display an image under the second printed circuit board. The method of claim 9, The second display panel is implemented as an organic electroluminescent display panel. The method of claim 1, And the bottom chassis is coupled to the mold frame and the hook of the backlight assembly. The method of claim 1, The bottom chassis is coupled to the mold frame of the backlight assembly by insert injection.

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