KR20070102160A - Liquid crystal display device - Google Patents

Abstract

A liquid crystal display apparatus is provided to attach a window without a double-faced tape, thereby implementing a thin type liquid crystal display apparatus and preventing stain and window alien material due to double faced tape contact from being occurred. A liquid crystal display apparatus comprises the following parts: a backlight assembly(1000); a display assembly which is located in an upper part of the backlight assembly; a window(4200) which is located in an upper part of the display assembly; a mold frame(3000) for accepting the backlight assembly and display assembly; at least one connecting member(3400) is formed along an edge point of the mold frame; and a connecting hole(4300) which corresponds to the connecting member in the window.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

1 is an exploded perspective view illustrating a liquid crystal display according to the present invention.

FIG. 2 is a cross-sectional view of the liquid crystal display taken along the line A-A of FIG. 1.

3 and 4 are cross-sectional views illustrating a coupling process of a liquid crystal display according to the present invention.

5 is a cross-sectional view illustrating a modified example of a bonding process of a liquid crystal display according to the present invention.

6 is a cross-sectional view showing various shapes of the coupling member according to the present invention.

               <Description of the code | symbol about the principal part of drawings>

1000: backlight assembly 2000: display assembly

3000: mold frame 3100: first storage space

3200: second storage space 3300: flat portion

3400: coupling member 4100: coupling

4200: window window 4300: coupling holes

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device for preventing the loss caused by the foreign matter caused by the double-sided tape and lowering workability when assembling the liquid crystal display device.

Recently, liquid crystal displays (LCDs), plasma display panels (PDPs), organic light emitting diodes (OLEDs) instead of cathode ray tubes (CRTs) Such flat panel display devices are rapidly developing. Among them, LCDs are thinner and lighter than other display devices, and have low power consumption and low driving voltage, so that they are widely used in various devices.

Recently, according to the development trend of mobile phone LCD, the thinning of LCD is a key topic, and one of the key technologies of LCD thinning is the method of combining windows.

The conventional liquid crystal display device is composed of a backlight assembly and a display assembly positioned on the backlight assembly.

In this case, the display assembly may include a liquid crystal display panel including a thin film transistor substrate and a color filter substrate positioned on the thin film transistor substrate, a window on the upper portion of the liquid crystal display panel, and a mold frame surrounding lower and side surfaces of the backlight assembly. Consists of.

In the mold frame, a backlight assembly and a liquid crystal display panel are sequentially received, and the window is bonded by a mold frame and a double-sided tape to form a liquid crystal display device.

However, as described above, the bonding method using the double-sided tape not only obstructs the thinning of the mobile phone LCD by the thickness of the double-sided tape, but also causes various foreign matters when it is bonded by the double-sided tape, or decreases workability and reassembly. Cause work loss.

In order to solve the above problems, an object of the present invention is to provide a liquid crystal display device for thinning a mobile phone LCD, and preventing foreign matters caused and lost due to double-sided tape.

In order to achieve the above object, the liquid crystal display device of the present invention includes a backlight assembly, a display assembly positioned above the backlight assembly, a window disposed above the display assembly, and a mold frame accommodating the backlight assembly and the display assembly. At least one coupling member is formed along an edge of the mold frame, and the coupling hole corresponding to the coupling member is formed in the window.

The coupling member may include at least one wedge portion, and a number of coupling holes corresponding to the wedge portion may be formed in the window. In addition, the wedge portion is formed spaced apart by a predetermined interval.

The coupling member is preferably formed on one side and the other side of the mold frame opposite.

Hereinafter, an embodiment of a liquid crystal display according to the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention, and to those skilled in the art the scope of the invention. It is provided for complete information. Like numbers refer to like elements in the figures.

1 is an exploded perspective view illustrating a liquid crystal display according to the present invention, and FIG. 2 is a cross-sectional view of the liquid crystal display taken along the line A-A of FIG. 1.

Referring to the drawings, the liquid crystal display includes a backlight assembly 1000, a display assembly 2000 disposed on the backlight assembly 1000, and the backlight assembly 1000 and the display assembly 2000. The mold frame 3000 may include a window 4000 positioned on the display assembly 2000.

The backlight assembly 1000 may include a light guide plate 200, a light source unit 100 disposed on one side of the light guide plate 200, a reflective plate 400 installed under the light guide plate 200, and an upper portion of the light guide plate 200. It consists of the several optical sheet 300 provided in the.

The light guide plate 200 converts a point light source incident from the light source unit 100 into a surface light source. The light guide plate 200 is made of a transparent material such as polyolefin or polycarbonate, which is usually PMMA (Poly Methy Methacrylate), which is an acrylic resin.

The light source unit 100 is installed on the side of the light guide plate 200. The light source unit 100 includes an LED device 110 and a substrate 120 on which the LED device 110 is mounted.

The LED element 110 is a side view type element and emits light toward the side surface of the light guide plate 200. In addition, the substrate 120 is a flexible printed circuit board having excellent bending, and a circuit (not shown) is formed therein to supply external power to the LED device 110 through the circuit.

Therefore, the light emitted from the light source unit 100 is incident to the side surface of the light guide plate 200 and is emitted upward through the light guide plate 200.

The reflective plate 400 is installed under the light guide plate 200, and reflects some light emitted from the lower side of the light guide plate 200 to the light exit surface of the backlight assembly 1000 to increase light efficiency. In addition, the reflection amount of the entire incident light is adjusted so that the entire light exit surface of the backlight assembly 1000 has a uniform luminance distribution.

The reflective plate 400 generally uses a polyester film, and the reflective layer and the packing layer are coated on both sides of the polyester film, thereby preventing incident light from leaking out, and improving the luminance characteristic with a high reflective layer structure having excellent hiding properties.

The optical sheet 300 includes a diffuser plate 310 and at least one prism sheet 320, and is disposed above the light guide plate 200 to uniformly distribute luminance of light emitted from the light guide plate 200. .

The display assembly 2000 includes a liquid crystal display panel 500 and a driving circuit unit 600.

The liquid crystal display panel 500 includes a color filter (CF) substrate 510 and a thin fir transistor transistor (TFT) substrate 520. In this case, polarizers 710 and 720 may be further provided on the CF substrate 510 and on the TFT substrate 520.

The CF substrate 510 is a substrate in which RGB pixels, which are color pixels in which a predetermined color is expressed while light passes, are formed by a thin film process. A common electrode made of a transparent conductor such as indium tin oxide (ITO) or indium zinc oxide (IZO) is coated on the entire surface of the CF substrate 510.

The TFT substrate 520 is a transparent glass substrate on which TFTs in matrix form are formed. The data line is connected to the source terminal of the TFTs, and the gate line is connected to the gate terminal.

A pixel electrode made of a transparent electrode made of a transparent conductive material is formed in the drain terminal. Therefore, when electrical signals are input to the data lines and the gate lines, the respective TFTs are turned on or turned off to apply electrical signals necessary for pixel formation of the drain terminal.

When the TFT is turned on by applying power to the gate terminal and the source terminal of the TFT substrate 520, an electric field is formed between the pixel electrode and the common electrode of the CF substrate 510, thereby forming the TFT substrate 520 and the CF substrate. The arrangement of the liquid crystals injected between 510 is changed, and the light transmittance is changed according to the changed arrangement to obtain a desired image.

The driving circuit unit 600 connected to the liquid crystal display panel 500 includes a driving circuit 630 mounted at one end of the TFT substrate 520 for driving the panel, and a printing for applying a predetermined signal to the TFT substrate 520. A circuit board (PCB) 620 and a flexible printed circuit board (FPC) 610 for connecting between the PCB 620 and the TFT substrate 520 are included.

In this case, the driving circuit 630 includes a gate driver and a data driver, wherein the gate driver applies a predetermined gate to a gate line of the TFT substrate 520, and the data driver applies a predetermined data signal to a data line. Apply.

In the present exemplary embodiment, the driving circuit 630 includes a gate driver and a data driver as an example. Alternatively, the driving circuit 630 may be divided into a data driver and a gate driver.

The mold frame 3000 may sequentially receive the backlight assembly 1000 and the display assembly 2000, and may be coupled to the window 4000 positioned on the display assembly 2000. At this time, the window 4000 is made of an acrylic material in a square shape.

That is, as shown in FIG. 2, the mold frame 3000 is formed in a box shape of a rectangular parallelepiped having an upper portion, and includes a first accommodating housing for sequentially receiving the reflector plate 400, the light guide plate 200, and the optical sheet 300. The space 3100 and the second accommodation space 3200 in which the display assembly 2000 is accommodated are formed.

Therefore, the backlight assembly 1000 is placed in the first storage space 3100 and the display assembly 2000 is placed in the second storage space 3200.

A flat portion 3300 is formed along an edge of the mold frame 3000, and a plurality of coupling members 3400 are formed on the flat portion 3300.

The window 4000 includes a central portion 4200, a coupling portion 4100 formed along an edge of the window 4000 with a step difference from the central portion 4200, and a plurality of coupling holes 4300 formed in the coupling portion. Include. Accordingly, the plurality of coupling members 3400 are coupled through the coupling holes 4300 formed in the coupling portion 4100 of the window 4000.

In the drawing, the center portion 4200 and the coupling portion 4100 are formed by giving a step, but may not give a step.

3 and 4 are cross-sectional views illustrating a bonding process of a liquid crystal display according to the present invention, and FIG. 5 is a cross-sectional view illustrating a modified example of the bonding process of a liquid crystal display according to the present invention.

Referring to FIG. 3, the coupling member 3400 includes a first wedge portion 3400a and a second wedge portion 3400b having a wedge shape, and the first and second wedge portions 3400a and 3400b. Is composed of base parts 3420a and 3420b and protrusions 3410a and 3410b protruding from the base parts 3420a and 3420b.

In this case, the first wedge portion 3400a and the second wedge portion 3400b have a tension and are spaced apart from each other by a predetermined interval.

As shown in FIG. 3, when the coupling member 3400 is inserted into the coupling hole 4300, the coupling member 3400 has a tension, thereby causing the coupling member 3400 to bend and the coupling hole. It is inserted into (4300).

Thereafter, as shown in FIG. 4, when the coupling member 3400 is completely inserted into the coupling hole 4300, the coupling member 3400 may be fully engaged because the protrusion is caught by the window coupling portion by a restoring force.

In the above, the first wedge portion and the second wedge portion are inserted into one coupling hole. However, the first wedge portion and the second wedge portion may be inserted and fixed by forming two coupling holes.

As shown in the figure, the wedge portion is not limited to two, and a plurality of wedge portions may be formed, and the plurality of wedge portions may be combined with one or a plurality of coupling holes. At this time, it is preferable that the plurality of coupling holes correspond to the plurality of wedge parts.

In addition, as shown in FIG. 5, the coupling member 3400 may be configured by forming one wedge portion and fitted into the coupling hole 4300 formed in the window 4000. In this case, the protrusion of the coupling member 3400 may be formed toward the outside of the window, or may be formed toward the inside.

As described above, since the coupling structure of the coupling member 3400 between the window 4000 and the mold frame 3000 does not use the double-sided tape, the coupling structure 3400 may be thinned by the thickness of the double-sided tape.

In addition, the coupling member 3400 as described above is preferably formed on at least one side of the mold frame 3000 and the other side opposite to the one side for complete coupling of the liquid crystal display device.

6 is a cross-sectional view showing various shapes of the coupling member according to the present invention.

As illustrated in FIG. 6, the coupling member 3400 may have an upper portion of the protruding portion so that the coupling member 3400 can be easily entered even when the coupling hole 4300 of the window is small. In addition, by inclining the protruding portion, the engagement with the window coupling hole 4300 can be facilitated.

The shape of the coupling member 3400 is not limited to FIG. 6, and may be various shapes without departing from the object of the present invention.

In the above-described embodiment, a liquid crystal display device having an edge type backlight assembly used in a mobile phone is illustrated, but the connection structure of the present invention is not limited thereto and may be applied to small and medium and large liquid crystal display devices having various shapes. For example, the liquid crystal display light source unit can be configured using a cold cathode fluorescent lamp, and the structure of the light source unit can be formed in a direct type.

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

As described above, the liquid crystal display of the present invention has proposed a structure for attaching a window without double-sided tape. Therefore, there is an effect that the liquid crystal display device can be thinned.

In addition, there is an effect that can prevent the window foreign matter and stain defects due to the contact by the double-sided tape.

In addition, the connection structure according to the present invention has the effect of easy one-touch assembly and disassembly.

Claims (5)

With backlight assembly, A display assembly positioned above the backlight assembly; A window located above the display assembly; A mold frame containing the backlight assembly and the display assembly; At least one coupling member is formed along an edge of the mold frame, and a coupling hole corresponding to the coupling member is formed in the window. The liquid crystal display device of claim 1, wherein the coupling member comprises at least one wedge portion. The liquid crystal display device according to claim 2, wherein a number of coupling holes corresponding to the wedge portion is formed in the window. The liquid crystal display device of claim 2, wherein the wedge portions are formed to be spaced apart from each other by a predetermined interval. The liquid crystal display device according to claim 1 or 2, wherein the coupling member is formed on one side and the other side of the mold frame facing the one side.

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