KR20060078866A - Flat Panel Display Improves Flexible Printed Circuit Board - Google Patents

Abstract

The present invention relates to a flat panel display device having an improved flexible printed circuit board. According to an aspect of the present invention, there is provided a flat panel display panel for displaying an image, a flexible printed circuit board connected thereto to transmit a driving signal for driving the flat panel display panel, and a drive signal connected to the protrusion to generate a drive signal. It includes a control board for driving a flat panel display panel through a printed circuit board. Here, a reinforcing plate is attached on the end of the protrusion of the flexible printed circuit board connected to the control board.

Reinforcement board, flexible printed circuit board, resin, bending

Description

Flat Panel Display Improves Flexible Printed Circuit Boards {A FLAT DISPLAY DEVICE PROVIDED WITH AN IMPROVED FLEXIBLE PRINTED CIRCUIT BOARD}

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

2 is a perspective view illustrating a flat panel display device according to an exemplary embodiment of the present invention.

3 is a rear perspective view of a flat panel display device according to an exemplary embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display device having improved flexible printed circuit boards, and more particularly, to a flat panel display device having improved conformity when assembling a flexible printed circuit board.

With the recent development of semiconductor technology, which is rapidly developing in recent years, the demand for flat panel display devices that are smaller and lighter and has improved performance is exploding.

The liquid crystal display (LCD), which has recently been in the spotlight among the flat panel display devices, has advantages such as miniaturization, light weight, and low power consumption, thereby overcoming the disadvantages of the conventional cathode ray tube (CRT). As an alternative means, it has been gradually attracting attention, and is currently used in almost all information processing apparatuses that require display devices.

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 display apparatus which displays information using the modulation of the light by a liquid crystal cell as converting into a change.

Such liquid crystal displays have relatively low power consumption and are easy to light and short, and thus are mainly used in portable display devices such as mobile phones, personal digital assistants (PDAs), and portable digital video disk (DVD) players. Therefore, in order to minimize the size of the liquid crystal display device to be portable, it is necessary to reduce the size of all the components assembled therein as well as simplify the fastening structure accordingly.

However, since the fastening force between the parts is relatively weakened according to the simplification of the fastening structure, there is a problem in that the fastening part is dropped due to an impact from the outside and thus the breakdown of the liquid crystal display device is frequent. In particular, this problem occurs frequently in the connection portion between the control board driving the liquid crystal display panel and the liquid crystal display panel. Therefore, it is necessary to maintain the fastening strength appropriately while simplifying the fastening structure to withstand external shocks.

 SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is an object of the present invention to simplify a fastening structure between a control board for driving a flat panel display panel and a flat panel display panel while improving the fastening strength thereof.

According to an aspect of the present invention, there is provided a flat panel display device including a flat panel display panel for displaying an image, a flexible printed circuit board connected thereto to transmit a driving signal for driving the flat panel display panel, and a protrusion part. And a control board for generating a driving signal and driving the flat panel display panel through the flexible printed circuit board. Here, a reinforcing plate is attached on the end of the protrusion of the flexible printed circuit board connected to the control board.

Here, it is preferable that a reinforcement board consists of transparent resin.

The transparent resin may be made of polyethylene terephthalate (PET).

The reinforcement plate may be attached with double-sided tape on the end of the protrusion of the flexible printed circuit board.

The backlight assembly may include a middle chassis on which the flat panel is mounted and supported, and the middle chassis may be sus (steel use stainless, stainless steel) material.

The flat panel display device according to the present invention further includes a backlight assembly for supplying light to the flat panel display panel, wherein the backlight assembly includes a middle chassis on which the flat panel display panel is seated and supported. The chassis is preferably sus (steel use stainless) material.

In addition, the flat panel display device according to the present invention further comprises a backlight assembly including a light source for supplying light to the flat panel display panel, the light source is preferably bent in the longitudinal direction.

Here, the light source is a lamp, and the lamp can supply light from two consecutive sides of the backlight assembly.

The flat panel display panel may be a liquid crystal display panel.

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

1 is an exploded perspective view of a flat panel display device 100 according to an embodiment of the present invention, which shows a small flat panel display device used in a portable DVD player or the like. 1 illustrates a liquid crystal display as an example of a flat panel display, but this is merely to illustrate the present invention, and the present invention is not limited thereto. Therefore, in addition to the liquid crystal display device, the present invention can be applied to other light-receiving flat panel display devices as well as plasma display devices (PDPs) and organic light emitting diodes (PDPs) that do not require the backlight assembly 70. OLED) can be applied to the present invention.

The flat panel display 100 shown in FIG. 1 includes a liquid crystal display panel 50 which is a flat panel display panel displaying an image and a backlight assembly 70 supplying light thereto. In addition, a top chassis 60 is further included to seat and support the liquid crystal display panel 50 on the backlight assembly 70, and may further include other components as necessary.

The liquid crystal display panel assembly 20 driving the liquid crystal display panel 50 includes a liquid crystal display panel 50, chips on glass (COG) 44 and 46, and a flexible printed circuit board 42. The liquid crystal display panel assembly 20 shown in FIG. 1 minimizes the size by using an integrated circuit chip (IC chip) in the form of a COG in consideration of the small size of the flat panel display device 100. In addition, since the flexible printed circuit board 42 is used as a printed circuit board connected to the liquid crystal display panel 50 to transmit a driving signal for driving the liquid crystal display panel 50, it is easy to accommodate in a small liquid crystal display device. Do. The flexible printed circuit board 42 will be described in more detail later.

The liquid crystal display panel 50 includes a TFT substrate 51 composed of a plurality of TFTs (thin film transistors), a color filter substrate 53 positioned on the TFT substrate 51, and a liquid crystal (injected therebetween). Not shown). The TFT substrate 51 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 line is connected to a gate terminal. 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 flexible printed circuit board 42 to the data lines and gate lines of the liquid crystal display panel 50 described above, electrical signals are input to the source and gate terminals of the TFT, Depending on the input, 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 53 is disposed thereon opposite the TFT substrate 51. The color filter substrate 53 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 this electric field, the arrangement angle of the liquid crystal injected between the TFT substrate 51 and the color filter substrate 53 is changed, and the light transmittance is changed according to the changed arrangement angle to obtain a desired pixel.

In order to control the arrangement angle of the liquid crystals of the liquid crystal display panel 50 and the timing at which the liquid crystals are arranged, a driving signal and a timing signal are applied to the gate line and the data line of the TFT, and on the gate side and the data side of the liquid crystal display panel 50. COFs 44 and 46 are attached to determine the timing of applying the gate driving signal and the data driving signal, respectively. The COFs 44 and 46 are connected to the flexible printed circuit board 42 through the wiring formed on the TFT substrate 51.

The flexible printed circuit board 42, which receives an image signal from the outside of the liquid crystal display panel 40 and transmits a driving signal to the data line and the gate line, is connected to the COFs 44 and 46. The control board 80 (shown in FIG. 3) connected to the flexible printed circuit board 42 may apply a data signal, a gate driving signal, and these signals, which are signals for driving the liquid crystal display panel 50, at an appropriate time. A plurality of timing signals are generated and applied to the gate line and the data line of the liquid crystal display panel 50 through the flexible printed circuit board 42.

The backlight assembly 70 is provided below the liquid crystal display panel assembly 20 to provide uniform light to the liquid crystal display panel assembly 20. The backlight assembly 70 includes a light source 76 and the like stored in the middle chassis 62 located above and the bottom chassis 64 located below. The middle chassis 62 is mounted on and supported by the liquid crystal display panel 50. The middle chassis 62 is made of sus (steel use stainless, stainless steel) material and is resistant to external impact. As described above, the liquid crystal display panel assembly 20 is seated on the backlight assembly 70, and then the top chassis 60 is covered and fixed thereon.

The backlight assembly 70 is positioned on a lower surface of the light guide plate 75 for supplying light, the light guide plate 75 for guiding the light emitted from the light source 76 to the liquid crystal display panel 50, and the light guide plate 75. Reflective sheet 79 for reflecting light emitted from 76, light source cover 78 for wrapping and protecting light source 76 and coating a reflective material on the inner surface to reflect light emitted from light source 76, and a light source And an optical sheet 72 for securing the luminance characteristic of the light from the 76 and providing the light to the liquid crystal display panel 50.

Although FIG. 1 shows a lamp as an example of a light source 76, this is merely to illustrate the present invention and the present invention is not limited thereto. Therefore, a light emitting diode (LED) may be used instead of a lamp, or a light source having a linear light source or a surface light source may be used. An inverter board 82 (shown in FIG. 3) is installed on the bottom of the bottom chassis 64 to connect a wire 761 (shown in FIG. 3) and a socket 77 (connected to the light source 76). 3, the external power is transformed to a constant voltage level and then applied to the light source 76 to drive the light source 76.

In the flat panel display device 100 shown in FIG. 1, the flexible printed circuit board 42 has a protrusion 421 formed to facilitate connection with the control board 80 (shown in FIG. 3). A reinforcement plate 10 is attached on the end of the protrusion 421 directly connected with the control board 80 (shown in FIG. 3). In order to simplify the fastening structure of the flat panel display device 100, the protrusion 421 of the flexible printed circuit board 42 is manufactured in a clamp type, not in a connector type. As such, the reinforcement plate 10 is attached to the end of the protrusion 421 for strength reinforcement while simplifying the protrusion 421 of the flexible printed circuit board 42 to a clamp type. Since the end of the protrusion 421 has a certain strength due to the reinforcing plate 10, it is well fastened with the control board 80 (shown in FIG. 3). Hereinafter, the end structure of the protrusion 421 will be described in more detail with reference to FIG. 2.

FIG. 2 is a perspective view illustrating a flat panel display device 100 according to an exemplary embodiment of the present invention, in which all internal components of the flat panel display device 100 shown in FIG. 1 are combined. The enlarged circle of FIG. 2 shows a portion of the cross section taken along the line AA through which the end of the protrusion 421 of the flexible printed circuit board 42 passes.

The reinforcing plate 10 attached on the end of the protrusion 421 is made of a transparent resin. Here, polyethylene terephthalate can be used for a transparent resin. Since the protrusion 421 of the flexible printed circuit board 42 is clamped and fixed to the control board 80 (shown in FIG. 3), an alignment miss may occur as compared to the case where the connector is fastened and fixed to the connector type. The probability is high. When a mismatch occurs, a short circuit occurs and an electric shock occurs, so that it is readjusted again, thereby increasing the tack time. In particular, this phenomenon frequently occurs in a module test jig that inspects the flat panel display 100 during the manufacture of the flat panel display 100. In view of this point, the reinforcing plate 10 is made of a transparent resin to visually check the wiring on the flexible printed circuit board 42. Accordingly, the manufacturing time can be shortened to the maximum by increasing the matchability of the wiring when the flexible printed circuit board 42 is fastened and fixed.

As shown in the enlarged circle of FIG. 2, the reinforcing plate 10 can be simply attached onto the end of the protrusion 421 of the flexible printed circuit board 42 with the double-sided tape 12, so that the manufacturing process is performed. Simple. The cross section of the protrusion 421 of the flexible printed circuit board 42 includes a cover layer 421a, an adhesive layer 421b, a base film 421c, a copper wiring 421d, a copper plate 421e, and a gold plated material. It consists of the board 421f. The cross-sectional structure of the protrusion 421 of the flexible printed circuit board 42 is merely to illustrate the present invention, but the present invention is not limited thereto. Therefore, the cross section of the flexible printed circuit board 42 may be formed in another structure.

3 is a rear perspective view of the flat panel display 100 according to an exemplary embodiment of the present invention. The flat panel display 100 shown in FIG. 2 is rotated by 180 ° with respect to the X axis.

As shown in FIG. 3, the flexible printed circuit board 42 is bent along the side of the bottom chassis 64 and fastened to the control board 80 fixed to the bottom surface of the bottom chassis 64. As described above, a reinforcing plate 10 (shown in FIGS. 1 and 2) is attached to the protrusion 421 of the flexible printed circuit board 42, so that the fastening reliability with the control board 80 is high and the wiring is matched. This is done well.

On the other hand, as shown by a dotted line in Figure 3, the light source 76 is bent in the longitudinal direction to supply light to implement a clear image to the flat panel display 100. In particular, since light is supplied from two consecutive side surfaces of the backlight assembly, the side along the X axis direction and the side along the Y axis direction, light may be supplied in all directions to realize a clearer image. The light source having such a structure is preferably applied to a flat panel display having a small size.

As described above, the flat panel display device according to the present invention has the advantage that the fastening reliability is high because the reinforcing plate is attached on the end of the protrusion of the flexible printed circuit board.

Here, since the reinforcing plate is made of a transparent resin, it is possible to check the matching of the wiring with the naked eye when fastening with the control board, there is an advantage that can prevent the mismatch.

Since the transparent resin is made of polyethylene terephthalate, it is easy to obtain a material and there is an advantage that the manufacturing cost is reduced.

Since the reinforcement plate is attached by double-sided tape on the end of the protrusion of the flexible printed circuit board, there is an advantage of easy operation.

Since the backlight assembly includes a middle chassis on which the flat panel display panel is seated and supported, the backlight assembly is resistant to external shock, and in particular, since the middle chassis is sus material, it is easy to obtain a material.                     

The light source included in the backlight assembly may be bent in the longitudinal direction to supply light in different directions to implement a clear image.

The light source is a lamp, and supplies light from two consecutive sides of the backlight assembly, thereby realizing a clearer image.

Since the flat panel display panel is a liquid crystal display panel, there is an advantage that the application possibility is excellent.

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)

Flat panel display panel for displaying images, A flexible printed circuit board (FPC board) connected to the flat panel display panel and transmitting a driving signal for driving the flat panel panel; A control board is connected to the protrusion of the flexible printed circuit board, and generates a driving signal to drive the flat panel display panel through the flexible printed circuit board. Including, And a reinforcing plate attached to an end portion of a protrusion of the flexible printed circuit board connected to the control board. In claim 1, The reinforcing plate is a flat panel display device made of a transparent resin. In claim 2, The transparent resin is a polyethylene terephthalate (PET). In claim 1, And the reinforcing plate is attached to the end of the protrusion of the flexible printed circuit board by double-sided tape. In claim 1, A backlight assembly may further include a backlight assembly configured to supply light to the flat panel display panel. The backlight assembly may include a middle chassis on which the flat panel display panel is seated and supported. The middle chassis may be sus (steel). flat display device made of stainless steel. In claim 1, And a backlight assembly including a light source for supplying light to the flat panel display panel, wherein the light source is bent in a longitudinal direction thereof. In claim 6, Wherein the light source is a lamp, and the lamp supplies light from two consecutive sides of the backlight assembly. In claim 1, And the flat panel display panel is a liquid crystal display panel.

Images