KR20060079694A - Flexible printed circuit board protective film member and flat display device using same - Google Patents

Abstract

The present invention relates to a light for a flexible printed circuit board protective film member and a flat panel display device using the same. To this end, the protective film member according to the present invention protects a flexible printed circuit board connected to a flat panel display panel provided in the flat panel display device and providing a driving signal. Here, the protective film member includes a protective film attached to the flexible printed circuit board and a cover which is detachably attached thereto. A part of the edge of the flexible printed circuit board is opened to form a concave groove facing inward, and the protective film is attached to the flexible printed circuit board while covering the concave groove.

Flexible printed circuit board, cantilever, protective film, cover

Description

Flexible printed circuit board protective film member and flat panel display device using same {A PROTECTIVE FILM MEMBER FOR A FLEXIBLE PRINTED CIRCUIT BOARD AND A FLAT DISPLAY DEVICE USING THE SAME}

1 is an exploded perspective view of a flat panel display using the flexible printed circuit board protective film member according to an embodiment of the present invention.

2 is a view showing a state in which a flexible printed circuit board protective film member is attached according to an embodiment of the present invention.

3 is a view showing a working state of the flexible printed circuit board protective film member according to an embodiment of the present invention.

The present invention relates to a flexible printed circuit board protective film member and a flat panel display device using the same, and more particularly, to a flexible printed circuit board protective film member and a flat panel display using the same. Relates to a device.

With the recent rapid development of semiconductor technology, the demand for liquid crystal display devices that are smaller and lighter and has improved performance is exploding.

Recently, liquid crystal displays (LCDs), which have been in the spotlight, have advantages such as miniaturization, light weight, and low power consumption, and as an alternative means to overcome the disadvantages of the conventional cathode ray tube (CRT). It has been attracting attention and is currently used in almost all information processing equipment that requires a display device.

A general liquid crystal display device applies voltage to a specific molecular array of a liquid crystal to convert it into another molecular array, and visually changes optical properties such as birefringence, photoreactivity, dichroism, and light scattering characteristics of the liquid crystal cell emitted by the molecular array. It is a light-receiving display device which converts into a change and displays information using the modulation of the light by a liquid crystal cell.

The above-mentioned liquid crystal display device is adopted in most of the small flat panel display devices used for a cellular phone. Cell phones are mostly manufactured in folders to provide a large amount of information while miniaturizing their size. As described above, when the cellular phone is manufactured in a folder type, the flat panel display device included in the folder window of the cellular phone is connected to the mobile phone side driving circuit through a tail connected to a flexible printed circuit board (FPC board). Connected.

When using a clamshell cell phone, since the cell phone folder is continuously opened and closed, flexibility is required for the tail part connecting the mobile phone-side driving circuit and the flexible printed circuit board. Accordingly, for convenience, the tail part is integrally formed with the flexible printed circuit board. On the other hand, the flexible printed circuit board is fixed to the flat panel display device by using a double-sided tape and mutually attached to the bottom chassis provided in the flat panel display device.

However, the opening and closing of the mobile phone folder is repeated during the use of the mobile phone, so that the tension is continuously applied to the tail part, so that the tail part is torn on the flexible printed circuit board and the side part connected to the mobile phone, causing the mobile phone to malfunction. There is a problem. In particular, during the manufacturing process of the flat panel display device, the flexible printed circuit board is often torn on the side of the tail due to the structure of the flexible printed circuit board on which the tail is formed.

The present invention is to solve the above problems, to provide a flexible printed circuit board protective film member having a structure that can prevent the tearing of the flexible printed circuit board.

In addition, the present invention is to provide a flat panel display device using the aforementioned flexible printed circuit board protective film member.

The protective film member according to the present invention for achieving the above object is connected to the flat panel display panel provided in the flat panel display device to protect the flexible printed circuit board for providing a drive signal. Here, the protective film member includes a protective film attached to the flexible printed circuit board and a cover which is detachably attached thereto. In the flexible printed circuit board, recessed grooves are formed with a part of the edge thereof opened inward, and the protective film is attached to the flexible printed circuit board while covering the recessed grooves.

Here, the cantilever beam is preferably formed at the corner of the cover.

The flexible printed circuit board protective film member according to the present invention may further include an adhesive layer formed on both sides of the protective film.

A flat panel display device according to the present invention is connected to a flat panel display panel for displaying an image, a backlight assembly for supplying light to the flat panel display panel, a bottom chassis for storing the backlight assembly, and a flat panel display panel. And a flexible printed circuit board which provides a driving signal for driving the flat panel display panel. Here, both sides of the tail formed on the flexible printed circuit board are opened for external connection, and a pair of recessed grooves are formed toward the inside of the flexible printed circuit board, and is formed between the bottom chassis and the flexible printed circuit board. The protective film which covers a recessed groove is attached to it.

Here, the concave groove may be formed in the flexible printed circuit board in a direction parallel to the direction in which the tail portion extends.

An adhesive layer may be formed on both sides of the protective film to bond the bottom chassis and the flexible printed circuit board to each other.

The flat panel display device according to the present invention may include two or more flat panel display panels, and at least one of the flat panel display panels may be a liquid crystal display panel.

The flat panel display device according to the present invention may be for a mobile phone.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3. Such embodiments of the present invention are merely for illustrating the present invention, and the present invention is not limited thereto.

1 is an exploded perspective view of a flat panel display device 100 using a flexible printed circuit board protective film member according to an embodiment of the present invention, in which a protective film 101 is attached on a flexible printed circuit board 610. Indicates the state. 1 illustrates a dual flat panel display apparatus in which the main flat panel display panel 200 and the sub flat panel display panel 300 face each other as an example of the flat panel display apparatus. It is intended to illustrate the structure and arrangement and the invention is not limited thereto. Therefore, the structure and arrangement of the flat panel display may be variously modified.

The flat panel display apparatus 100 illustrated in FIG. 1 includes a flat panel display panel assembly 250 and a backlight assembly 900 that supplies light to the flat panel display panels 200 and 300. In addition, a top chassis 361, a mold frame 336, and a bottom chassis 362 are provided to fix and support them.

The flat panel display panel assembly 250 includes a main flat panel display panel 200, a sub flat panel display panel 300, a first flexible printed circuit board 350, a second flexible printed circuit board 360, and an integrated circuit chip ( 620 and a main flexible printed circuit board 610. Although two flat panel display panels are shown in FIG. 1, these are merely to illustrate the present invention, and the present invention is not limited thereto. Therefore, it is only necessary to include two or more flat panel display panels. In addition, although two liquid crystal display panels are illustrated as the flat panel display panels 200 and 300 in FIG. 1, this is merely to exemplify the flat panel display panel used in the present invention, and the present invention is not limited thereto. Therefore, it is only necessary to include at least one liquid crystal display panel, and an organic light emitting diode (OLED) may be used as a flat panel display panel without using a backlight assembly.

The main flat panel display panel 200 is larger than the sub flat panel display panel 300 facing the main flat panel display panel 200. The flat panel display device 100 can be used in particular for a clamshell cell phone. The main flat panel display panel 200 is located on the inner surface of the cell phone folder and the sub flat panel display panel 300 is located on the outer surface of the cell phone folder. Therefore, when the folder is closed, a relatively small amount of information such as time can be contacted through the sub-flat display panel 300 having a small screen size, and the main flat panel display panel having a large screen size is opened by opening a folder when talking to the other party. At 200, a relatively large amount of information can be encountered.

Hereinafter, an internal structure of the main flat panel display panel 200 which is a liquid crystal display panel will be described. Since the structure of the sub flat panel display panel 300 is the same as that of the main flat panel display panel 200, a detailed description thereof will be omitted.

The TFT (thin film transistor) substrate 200b disposed below the main flat panel display panel 200 is a transparent glass substrate on which a matrix thin film transistor is formed. A data line is connected to a source terminal and a gate terminal is connected to a gate terminal. The gate line is connected. In the drain terminal, a pixel electrode made of transparent indium tin oxide (ITO) as a conductive material is formed.

When electrical signals are input from the main flexible printed circuit board 610 to the data lines and the gate lines of the main flat panel display panel 200, electrical signals are input to the source and gate terminals of the TFT, and these electrical signals are input. Accordingly, the TFT is turned on or turned off so that an electrical signal necessary for pixel formation is output to the drain terminal.

On the other hand, the color filter substrate 200a is disposed on the TFT substrate 200b. The color filter substrate 200a 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, and a common electrode made of ITO is coated on the entire surface thereof. When power is applied to the gate terminal and the source terminal of the TFT and the thin film transistor is turned on, an electric field is formed between the pixel electrode and the common electrode of the color filter substrate. By the electric field, the arrangement angle of the liquid crystal injected between the TFT substrate 200b and the color filter substrate 200a is changed, and the light transmittance is changed according to the changed arrangement angle to obtain a desired pixel. Polarizers (not shown) are attached to both surfaces of the TFT substrate 200b and the color filter substrate 200a.

The integrated circuit chip 620 applies a driving signal and a timing signal to the gate line and the data line of the TFT in order to control the arrangement angle of the liquid crystals of the main flat panel display panel 200 and the timing when the liquid crystals are arranged. The integrated circuit chip 620 is attached on the TFT substrate 200b and surrounded by the protective film 621. The integrated circuit chip 620 generates a data signal, a gate driving signal, which is a signal for driving the main flat panel display panel 200, and a plurality of timing signals for applying these signals at an appropriate time, thereby generating a gate driving signal and data. The signal is applied to the gate line and the data line of the main flat panel display panel 200, respectively.                     

The second flexible circuit board 360 surrounds one side of the bottom chassis 362 and connects the main flat panel display panel 200 and the second flat panel display panel 300 to each other. In FIG. 1, the second flexible circuit board 360 is cut off for convenience of illustration, but is actually connected. As such, since the main flat panel display panel 200 and the sub flat panel display panel 300 are connected to each other, the driving signal of the integrated circuit chip 620 is transmitted to the sub flat panel display panel 300 through the main flat panel display panel 200. Thus, the sub flat panel display panel 300 is controlled by the integrated circuit chip 620.

At the end of the main flexible printed circuit board 610, which transmits a signal to the first flexible printed circuit board 350, a tail 6131 is formed for external connection. The main flexible printed circuit board 610 receives a signal according to the opening and closing degree of the folder window for the mobile phone through the tail portion 6103. The first flexible printed circuit board 350 connects the main flat panel display panel 200 and the main flexible printed circuit board 610. In FIG. 1, the first flexible circuit board 350 is cut off for convenience of illustration, but is actually connected.

The backlight assembly 900 is provided between the main flat panel display panel 200 and the sub flat panel display panel 300 to provide uniform light emitted from the light source 910 to both flat panel display panels 200 and 300. . The backlight assembly 900 is accommodated in the bottom chassis 362 and is fixed to the reflective sheet 343 for reflecting and transmitting light, the light guide plate 341 for guiding light, and the optical sheets 342a and 342b for improving brightness. And a light source 910. The reflective sheet 343 transmits a part of the light emitted from the light source to the lower part to supply the light to the sub flat panel display panel 300.

Although FIG. 1 shows a light emitting diode (LED) 910 mounted on a substrate 950 as a light source, this is merely to illustrate the invention, but the invention is not limited thereto. Therefore, other light sources such as a lamp can be used as the light source, and a linear light source and a surface light source in which the light emitting diodes are modularized can also be used. Also, although the number of light emitting diodes is shown as three, this is merely to illustrate the present invention and the present invention is not limited thereto. Therefore, the number of light emitting diodes can be varied as needed. The substrate 950 is connected to the third flexible printed circuit board 370 to receive a light source control signal from the main flexible printed circuit board 610 to drive the light source 910.

The substrate 950 on which the light source 910 is mounted is received and fixed on the mold frame 336, and the flat panel display panel assembly 250 and the backlight assembly 900 are fixedly supported. A top chassis 361 and a bottom chassis 362 are respectively provided on the upper and lower portions of the flat panel display panel 250 to form the flat panel display device 100 by combining them. An opening 3621 is formed in the bottom chassis 362 to fix the sub flat panel display panel 300. The lower part of the bottom chassis 362 is covered with a main flexible printed circuit board 610 having an opening 6105 so that the sub flat panel display panel 300 is exposed to the outside.

A recess formed in the main flexible printed circuit board 610 between the main flexible printed circuit board 610 and the bottom chassis 362 that is connected to the main flat panel display panel 200 and provides a driving signal for driving the main flat panel display panel 200. A protective film 101 covering 6161 is attached. Although the protective film 101 is attached to the main flexible printed circuit board 610 in FIG. 1, this is merely to illustrate the present invention, but the present invention is not limited thereto. Therefore, the protective film 101 may be attached to other flexible printed circuit boards as necessary.

An opening is also formed in the protective film 101 to display an image on the sub flat panel display panel 300. The concave groove 6101 is formed on both sides of the tail portion 6103 and is formed along the Y-axis direction that is the inner side of the main flexible printed circuit board 610. The shape of such recessed part 6101 is merely for illustrating the present invention, and the present invention is not limited thereto. Therefore, it is only necessary to open a portion of the edge of the flexible printed circuit board 610 to form concave grooves facing inward.

In this way, since the connecting portion of the tail portion 6103 to the main flexible printed circuit board 610 is formed by the concave groove 6101, the connecting portion is located in the main flexible printed circuit board 610 without being exposed to the outside. The connection part is not torn even if the part 6103 is continuously folded. Since the concave groove 6101 is formed along the Y-axis direction in which the tail portion 6103 extends, the durability of the main flexible printed circuit board 610 is further improved.

In addition, since the protective film 101 covers the concave groove 6101 and is attached between the main flexible printed circuit board 610 and the bottom chassis 362, the concave groove even when the tail portion 6103 is continuously folded. The tension applied to 6161 can be blocked by the protective film 101. Accordingly, the concave groove 6101 may not be torn, thereby improving durability of the main flexible printed circuit board 610.

2 is a view showing a state in which the flexible printed circuit board protective film member 10 is attached according to an embodiment of the present invention, the protective film member 10 is attached to the main flexible printed circuit board 610. Indicates the state.

In the flat panel display 100 shown in FIG. 2, all components except for the main flexible printed circuit board 610 are coupled to the right side. 2 shows the main flexible printed circuit board 610 to which the protective film member 10 is attached, and the enlarged circle shows the cross-sectional structure of the protective film member 10 attached to the main flexible printed circuit board 610. Indicates.

As shown in the enlarged circle of FIG. 2, the protective film member 10 includes a protective film 101 attached to the main flexible printed circuit board 610 and a cover 103 detachably covered thereto. The protective film member 10 further includes an adhesive layer 101a formed on both sides of the protective film 101, wherein an adhesive layer 101a disposed at an upper portion thereof is attached to the bottom chassis 362, and an adhesive layer 101a disposed at a lower portion thereof. Is attached to the main flexible printed circuit board 610 to bond the main flexible printed circuit board 610 and the bottom chassis 362 to each other. Accordingly, the main flexible printed circuit board 610 is fixed to the bottom chassis 362.

The adhesive layer 101a located at the top before attachment is covered with the cover 103. The cantilever 1031 is formed in the corner part of the cover 103, and it is convenient to peel off the cover 103 in the arrow direction. Hereinafter, with reference to Figure 3 will be described a work process associated with the protective film member 10.

3 is a view showing a working state of the flexible printed circuit board protective film member 10 according to an embodiment of the present invention, and shows a process of removing the cover 103.

During the manufacture of the flat panel display apparatus 100, the main flexible printed circuit board 610 to which the protective film member 10 is attached is received, and thus the first flexible printed circuit board 350 and the third flexible printed circuit board ( 370). As shown in the right side of FIG. 3, the remaining parts of the flat panel display device 100 except for the main flexible printed circuit board 610 are completed.

The cover 103 is detached from the protective film 101 by pulling the cantilever 1031 formed at the corner portion of the cover 103 of the protective film member 10. Since the main flexible printed circuit board 610 is covered with the protective film 101, and the pair of concave grooves 6101 formed in the main flexible printed circuit board 610 are also covered with the protective film 101, the tail portion ( Even if the folding and folding operations are repeated at 6103, the concave groove 6101 can be fundamentally protected by the protective film 101. Thereby, the phenomenon in which the recessed groove 6101 is torn can be prevented beforehand.

In this way, the cover 103 is removed and the main flexible printed circuit board 610 to which the protective film 101 is attached is covered and attached on the bottom chassis 362. Accordingly, a protective film 101 having an adhesive layer formed on both surfaces thereof is interposed between the main flexible printed circuit board 610 and the bottom chassis 362. Through such a process, the flat panel display apparatus 100 to which the flexible printed circuit board 610 is firmly attached may be manufactured.

The flexible printed circuit board protective film member according to the present invention, since the protective film is attached while covering the concave groove formed in the flexible printed circuit board, it is possible to prevent the flexible printed circuit board from being torn due to the concave groove. have.

In addition, a cantilever is formed in the cover corner of the protective film member so that the cover can be easily removed from the protective film.

Since both sides of the protective film are formed with an adhesive layer, both sides can be attached.

Concave grooves are formed on both sides of the tail part formed on the flexible printed circuit board, and a protective film covering the concave groove is attached, so that the tearing of the flexible printed circuit board does not occur in the concave groove even when the tail part is repeatedly folded.

 Since the concave groove is formed in a direction parallel to the direction in which the tail portion extends, not only the folding operation of the tail portion is smoothly performed, but also the connection portion is formed in the flexible printed circuit board, so that the flexible printed circuit board is less likely to be torn.

Since the adhesive layer is formed on both sides of the protective film, the bottom chassis and the flexible printed circuit board can be brought into close contact and fixed.

Since two or more flat panel display panels are included, and at least one of the flat panel display panels is a liquid crystal display panel, there is an advantage that it can be used universally.

Since the flat panel display is for a mobile phone, there is an advantage of high applicability.

Although the present invention has been described above, it will be readily understood by those skilled in the art that various modifications and variations are possible without departing from the spirit and scope of the claims set out below.

Claims (8)

A film member for protecting a flexible printed circuit board (FPC board) connected to a flat panel display panel provided in the flat panel display device to provide a driving signal. The protective film member, A protective film attached to the flexible printed circuit board, and A cover covered to be detachable from the protective film Including, In the flexible printed circuit board, a recess is formed so that a part of an edge thereof is opened to face inward, and the protective film is a film member for protecting the flexible printed circuit board attached to the flexible printed circuit board while covering the recessed groove. . In claim 1, A flexible printed circuit board protective film member having a cantilever formed at a corner of the cover. In claim 1, The flexible printed circuit board protective film member further comprising an adhesive layer formed on both sides of the protective film. Flat panel display panel for displaying images, A backlight assembly supplying light to the flat panel display panel, A bottom chassis for receiving the backlight assembly, and A flexible printed circuit board connected to the flat panel display panel to provide a driving signal for driving the flat panel panel A flat panel display device comprising: Both ends of a tail formed on the flexible printed circuit board are opened for external connection, and a pair of concave grooves are formed toward the inner side of the flexible printed circuit board, and the bottom chassis and the flexible printed circuit are formed. A flat panel display device having a protective film covering the concave groove between substrates. In claim 4, And the concave groove is formed in the flexible printed circuit board in a direction parallel to a direction in which the tail portion extends. In claim 4, An adhesive layer is formed on both sides of the protective film, the flat panel display device for bonding the bottom chassis and the flexible printed circuit board to each other. In claim 4, And at least two flat panel display panels, wherein at least one of the flat panel display panels is a liquid crystal display panel. In claim 4, The flat panel display is a flat panel display for a mobile phone (handphone).

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