KR20000050959A - Flexible Printed Circuit mounted with Liquid Crystal Display driving element and LCD mounted with such an FPC - Google Patents

Abstract

The present invention relates to an FPC having an LCD driving element and a liquid crystal display device having an FPC. More particularly, the present invention relates to an LCD control element on a FPC in which two signal output regions are formed. The signal output region of the FPC is directly connected to the signal input region of the gate drive printed circuit board or the source drive printed circuit board of the liquid crystal display device by soldering or the like, and the signal of the remaining printed circuit board is The present invention relates to a liquid crystal display device equipped with FPC and FPC in which the input area and the remaining signal output area of the FPC are indirectly coupled using a connection medium such as a connector. According to the present invention, a source drive printed circuit board is provided. 2 outputs of FPC with control IC group at input terminals By using the soldering method or the combination of the soldering method and the connecting method by the connector, it minimizes the electromagnetic waves and at the same time installs only two FPCs, greatly reducing the cost and greatly improving the space utilization. Can be used interchangeably.

Description

FPC with LCD drive element and LCD mounted with liquid crystal display driving element and LCD mounted with such an FPC}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible printed circuit (FPC) in which an LCD drive element is mounted. More particularly, a display signal applied from an information processing apparatus main body by an FPC is a COF ( A flexible printed circuit that is processed by an LCD control IC formed by a chip on flexible method and then applies a processed display signal to either a gate drive printed circuit board or a source drive printed circuit board of a liquid crystal display module. It is about. The present invention also relates to a liquid crystal display device in which a flexible printed circuit in which an LCD driving element is integrally connected to a source drive printed circuit board or a gate drive printed circuit board of a liquid crystal display module is used without a connection medium such as a connector. It is about.

In recent years, as technology development and technology accumulation of all industries have been made, the importance of the information processing industry for processing a huge amount of information generated as a result of technology development and technology accumulation is increasing.

In particular, the information processing industry has been increasingly high performance and miniaturized by smaller semiconductor devices or semiconductor products with faster information processing performance. In recent years, because of its small size and light weight, it is easy to process information while moving. Development and dissemination of portable information processing devices are rapidly progressing.

Such a portable information processing apparatus is generally composed of an information processing apparatus main body for processing information and a liquid crystal display for displaying the processed information so that a user can recognize it.

1 is a perspective view partially disassembled a liquid crystal display of a conventional portable information processing apparatus, and FIG. 2 is a mold frame in which a liquid crystal display panel of the liquid crystal display of FIG. 1 is coupled to a mold frame which is a component of a backlight assembly. The combined perspective view of the back of the.

Referring to the accompanying drawings, the liquid crystal display device 50 is composed of, for example, the liquid crystal display module 30 and the case 40, the liquid crystal display module 30 is again displayed from the information processing apparatus main body (not shown) A backlight assembly which serves to support the liquid crystal display panel 10 while providing light to the liquid crystal display panel 10, a passive element, and a liquid crystal display panel 10 that generates an image corresponding to a display signal by receiving a signal ( 20).

The case 40 in which the liquid crystal display panel 10 is accommodated is composed of a rear case 42 and a front case 45 having an opening corresponding to an effective display area of the liquid crystal display panel 10.

Specifically, the liquid crystal display panel 10 includes a thin film transistor (TFT) substrate 12 having a thin film transistor (not shown) and a pixel electrode connected to the thin film transistor so as to be suitable for a predetermined resolution on a glass substrate by a semiconductor thin film manufacturing process. And a color filter substrate 14 having a common electrode facing each pixel electrode formed on the glass substrate surface facing the TFT substrate 12 and a color filter substrate 14 on which an RGB pixel is formed, and a data line and a gate line formed on the TFT substrate 12. The gate drive printed circuit board 16, the source drive printed circuit board 18, and the gate drive printed circuit board 16 and the source drive printed circuit board 18 for application are data lines and gate lines of the TFT substrate 12. And a tape carrier package 19 in which a drive drive IC 19a is formed so as to be connected to the control unit.

The liquid crystal display panel 10 configured as described above is combined with the backlight assembly 20, and the backlight assembly 20 is combined with a lamp assembly (not shown) and a lamp assembly to change the direction of light. It is composed of a reflecting plate 24 provided below the 22, and a plurality of optical sheets 26 provided above the light guide plate 22, including a liquid crystal display panel 10, a lamp assembly, a light guide plate 22, and a reflecting plate. (24), the optical sheets (26) are all fixed in a state of being stored in a storage container called a mold frame (28).

In this case, the gate drive printed circuit board 16 and the source drive printed circuit board 18 coupled to the liquid crystal display panel 10 are bent and fixed to the rear surface of the mold frame 28 to reduce the size of the product.

As described above, in order to receive a display signal from the main body (not shown) of the information processing apparatus to the liquid crystal display panel 10 while the liquid crystal display panel is fixed to the mold frame 28, the source drive printed circuit board 18 may process information. A source drive printed circuit board side connector 18a, which is a connecting medium, is provided so that a display signal is applied by a female connector 45a formed on the information processing apparatus main body side FPC 45 connected to the apparatus main body (not shown).

At this time, the display signal received from the FPC 45 on the main body of the information processing apparatus includes a video signal and vertical and horizontal synchronizing signals. For example, a control IC group 18b is formed in a portion of the source drive printed circuit board 18 for application to the circuit board 18.

On the other hand, there is no problem in that a part of the display signal processed by the source drive printed circuit board 18 is inputted by the control IC group 18b installed in the source drive printed circuit board 18, but the independent gate drive printed circuit board ( Since the display signal cannot be transmitted to the 16, the source drive printed circuit board 18 is provided with a separate output connector 18c to send some of the display signals to the gate drive printed circuit board 16.

2, one end of the gate drive printed circuit board side FPC 48 is connected to the gate drive printed circuit board 16 by soldering or the like, and the gate drive printed circuit board side FPC is connected to the gate drive printed circuit board 16. An input connector 48a is installed at the other end of the 48, and then connected to the output connector 18c of the source drive printed circuit board 18 mentioned above.

Subsequently, the liquid crystal display module 30 including the backlight assembly 20 and the liquid crystal display panel 10 is coupled to the case 40 including the rear case 42 and the front case 44 to manufacture the liquid crystal display module. In addition, the liquid crystal display device 50 is combined with the information processing apparatus main body (not shown).

However, the conventional liquid crystal display device having such a scheme and configuration has the following problems.

First, the conventional information processing apparatus main body side FPC (45) and the source drive printed circuit board (18) are connected in a connecting manner by connectors (18a, 18c) as connection media, and the source drive printed circuit board (18) and the gate are connected. The drive printed circuit board 12 is connected by the gate drive printed circuit board side FPC 48. In this case, a connector 18c for coupling with the source drive printed circuit board 18 is installed at one end of the gate drive printed circuit board side FPC 48, and the other end of the gate drive printed circuit board side FPC 48 is provided. Although coupled to the gate drive printed circuit board 12 by a soldering method or the like, there is a problem in that electromagnetic waves are generated by discontinuous impedance intensively generated in the aforementioned connection part.

Secondly, in order to apply a display signal to the source drive printed circuit board 18 and the gate drive printed circuit board 12 from the information processing apparatus body, the information processing apparatus main body and the source drive printed circuit board 18 are conventionally FPC. In order to connect the source drive printed circuit board 18 and the gate drive printed circuit board 12, a separate FPC needs to be connected again, thereby increasing the cost.

Third, when upgrading the liquid crystal display, there is a problem in that the source drive printed circuit board 12 or the gate drive printed circuit board 18 on which the control IC group 18b is formed must be replaced.

Accordingly, the present invention takes into account such a conventional problem, and an object of the present invention is to mount components corresponding to a group of control ICs on one FPC to transmit different display signals to two printed circuit boards with one FPC. It is in making it possible.

Another object of the present invention is to suppress the generation of electromagnetic waves by allowing the FPC and the printed circuit board to be electrically coupled without a separate connection medium.

Still other objects of the present invention will become more apparent from the detailed description of the invention which will be described later.

1 is an exploded perspective view of a conventional liquid crystal display device.

2 is a rear perspective view of a liquid crystal display module in a state where a case of a conventional liquid crystal display device is removed.

3 is an external perspective view of an information processing apparatus according to the present invention;

4 is an exploded perspective view showing an exploded liquid crystal display device of the information processing device according to the present invention;

FIG. 5 is an enlarged view of the circle of FIG. 4; FIG.

6 is a rear perspective view of the liquid crystal display module in a case where the case of the liquid crystal display according to the present invention is removed.

FPC equipped with an LCD driving element for achieving the object of the present invention is formed on a flexible substrate at least one signal input unit for inputting a predetermined signal, a signal processing device electrically connected to the signal input unit, the signal At least one first signal output electrically connected to the processing device, and at least one second signal output electrically connected to the signal processing device.

The liquid crystal display device to which the FPC according to the present invention is applied is a data drive printed circuit board and a second interposed liquid crystal between a TFT substrate and a color filter substrate and connected to a data line of the TFT substrate via a first tape carrier package. A liquid crystal display panel comprising a source drive printed circuit board connected to a gate line of a TFT substrate via a tape carrier package, a liquid crystal display module including a backlight assembly which is fixedly supported and supplies light to the liquid crystal display panel; And a case supporting the liquid crystal display module, wherein one of the source drive printed circuit board and the data drive printed circuit board is formed to be connected to the first signal output part of the flexible printed circuit, and the other Source drive printed circuit board or data drive printing The second signal input part is formed on one of the circuit boards so as to be connected to the second signal output part.

Hereinafter, an FPC equipped with an LCD driving element according to the present invention and a liquid crystal display device provided with an FPC will be described in detail with reference to the accompanying drawings.

First, Figure 3 is a perspective view showing an external view of an embodiment of the information processing apparatus according to the present invention.

Referring to the accompanying drawings, the information processing apparatus 400 includes the liquid crystal display 200 provided to allow the user to recognize the information processed by the information processing apparatus main body 300 and the information processing apparatus main body 300 as a whole. do.

Referring to FIG. 4, the liquid crystal display 200 again includes a case 210 and a liquid crystal display module 240, and the liquid crystal display module 240 is again a liquid crystal display panel 220 and a backlight assembly 230. It consists of. In this case, the case 210 includes a rear case 212 in which the liquid crystal display module 240 is accommodated, and a front case 214 coupled to the rear case 212.

In more detail, the backlight assembly 230 is inserted into the mold frame 231 and the inner surface of the mold frame 231, the upper surface of which is opened so that an accommodation space is formed in a thin hexahedral shape. The light guide plate 233 placed on the reflecting plate 232, the upper surface of the reflecting plate 232, and a lamp assembly (not shown) is inserted at one end, and a plurality of optical sheets 234 mounted on the upper surface of the light guide plate 233. It is composed.

The liquid crystal display panel 220 is mounted on the top surface of the optical sheet 234.

The liquid crystal display panel 220 is a liquid crystal (not shown) filled with a thickness of several μm between the TFT substrate 221, the color filter substrate 222, the TFT substrate 221, and the color filter substrate 222, and the TFT substrate. A composite function of applying a display signal to the printed circuit boards 223 and 224 to which the display signal is applied to the 221 and separating the display signal generated from the information processing apparatus main body 300 and providing it to the printed circuit boards 223 and 224. The display signal applying apparatus 250 performs the operation.

More specifically, the TFT substrate 221 is electrically connected to a thin film transistor (not shown) and the thin film transistor so as to have an integration degree suitable for a predetermined resolution by a semiconductor thin film manufacturing process on a rectangular transparent glass substrate having a predetermined area, and thus the thin film transistor. When turned on, the pixel electrode includes a pixel electrode to which a predetermined voltage is applied, a data line in electrical communication with the thin film transistor, and a gate line orthogonal to the data line to selectively turn on the thin film transistor.

The color filter substrate 222 has a somewhat smaller area than the TFT substrate 221 and is composed of a common electrode and an RGB pixel formed to face the pixel electrode of the TFT substrate 221.

The above-described data line extending to one side of the TFT substrate 221 and the other side adjacent to one side of the TFT substrate 221 and extending to the gate line orthogonal to the data line have a flexible drive driver IC 225a formed thereon. One end of the tape carrier package 225 is electrically coupled, and the other end of the tape carrier package 225 is electrically connected to a printed circuit board consisting of a gate drive printed circuit board 223 and a source drive printed circuit board 224. Combined.

In this case, the gate drive printed circuit board 223 and the source drive printed circuit board 224 are perpendicular to each other because the data lines and the gate lines are orthogonal to each other.

In an embodiment, a circuit at which one end of the source drive printed circuit board 224 is electrically connected to the first signal input pad 224a and the first signal input pad 224a through which the first signal is input along the edge thereof. A first signal output pad (not shown) communicating with lines (not shown) and the other end of the circuit lines is formed, and the tape carrier package 225 described above is in communication with the first signal output pad.

In addition, a second signal input connector 223a is installed on the gate drive printed circuit board 223 so that a second signal is input, and one end of circuit lines (not shown) communicates with the second signal input connector 223a. Second signal output pads (not shown) are formed at the other end of the circuit lines.

In this case, an output pad may be formed instead of the second signal input connector 223a.

In another embodiment, the first signal, which is a part of the display signal, is input to the source drive printed circuit board 224 by the first signal input connector and then output to the tape carrier package, and the edge of the gate drive printed circuit board 223 is provided. According to the present invention, although the second signal may be output to the tape carrier package after installing the second signal input pads to which the second signal is input, in the present invention, preferably, the second signal input pads are formed along the edge of the source drive printed circuit board 224. First signal input pads for inputting a first signal are installed, and a second signal input connector for inputting a second signal is installed on the gate drive printed circuit board 223.

As shown in FIG. 5 or 6, the first signal input pad 224a of the source drive printed circuit board 224 and the second signal connector 223a of the gate drive printed circuit board 223 are configured as shown in FIG. 5 or 6. The display signal applying device 250 is coupled.

The display signal applying device 250 includes an FPC 256 connected to the information processing apparatus main body 300 and a control IC group 253 electrically connected to a circuit line of the FPC 256. In this case, the control IC group 253 is composed of at least one integrated circuit (IC) 253a.

Specifically, the FPC 256 includes a first FPC side input circuit line 251 to which a display signal is applied from the information processing apparatus main body 300, and a control IC group 253 connected to the first FPC side input circuit line 251. A first control IC group side output circuit line 252 connected to the control IC group 253 and a second control IC group side output circuit line 254 connected to the control IC group 253 are formed.

More specifically, the first control IC group side output circuit line 252 includes a data signal to be applied to a portion of a signal processed by the control IC group 253, for example, the source drive printed circuit board 224. Output pads 252a are formed to be input and soldered to the first signal input pad 224a of the source drive printed circuit board 224 as described above.

In addition, a gate signal to be applied to the second control IC group-side output circuit line 254, for example, the gate drive printed circuit board 223 of the signals processed by the control IC group 253, is input. The connection connector 254 is installed to be connected to the second signal input connector 223a of the gate drive printed circuit board 223 described above.

In this manner, the liquid crystal display panel 220 and the backlight assembly 230 are formed in the state in which the display signal applying device 250 is coupled to the gate drive printed circuit board 223 and the source drive printed circuit board 224. In the state in which the display module 240 is accommodated in the rear case 21214, the front case 214 is again coupled to the rear case 212, whereby the liquid crystal display 200 is manufactured.

Thereafter, the liquid crystal display 200 is hinged to the information processing apparatus main body 300 to manufacture the information processing apparatus 400.

As described in detail above, the two output terminals of the FPC in which the control IC group is installed at the input terminals of the source drive printed circuit board and the gate drive printed circuit board are used by using a soldering method or a soldering method and a connector connecting method. By minimizing electromagnetic waves and installing only two FPCs at the same time, the cost can be greatly reduced, the space utilization is greatly improved, and the FPC can be used in common.

Claims (8)

At least one signal input unit formed on a flexible substrate and receiving a predetermined signal; A signal processing device electrically connected to the signal input unit; At least one first signal output unit electrically connected to the signal processing apparatus; And at least one second signal output unit electrically connected to the signal processing apparatus. The flexible printed circuit of claim 1, wherein an output pad is formed at an end of the first signal output part, and a connector is provided at an end of the second signal output part. The flexible printed circuit of claim 1, wherein a connector is provided at an end of the first signal output unit, and an output pad is installed at an end of the second signal output unit. The flexible printed circuit of claim 1, wherein the signal processing apparatus is an integrated circuit (IC) for processing a signal input from the signal input unit. A data drive printed circuit board connected between the TFT substrate and the color filter substrate and connected to the data line of the TFT substrate via a first tape carrier package and a gate line of the TFT substrate via a second tape carrier package; A liquid crystal display panel including a source drive printed circuit board connected to the liquid crystal display panel, a liquid crystal display module including a backlight assembly to which the liquid crystal display panel is fixedly supported and to supply light to the liquid crystal display panel; It includes a case for supporting the liquid crystal display module, Any one of the source drive printed circuit board or the data drive printed circuit board is provided with a first signal input part to be connected to the first signal output part of the flexible printed circuit according to claim 1, and the remaining source drive printed circuit board is provided. Or a second signal input part formed on one of the data drive printed circuit boards so as to be connected to a second signal output part. The method of claim 5, wherein the first signal input part is formed on the source drive printed circuit board, the second signal input part is formed on the data drive printed circuit board, and the flexible printed material is formed on the source drive printed circuit board. And the first signal output part of the circuit is coupled, and the second signal output part of the flexible printed circuit is coupled to the data drive printed circuit board. The method of claim 6, wherein the first signal input unit is an input pad formed at an end of the conductive circuit pattern connected to the first tape carrier package, and the second signal input unit is an end of the conductive circuit pattern connected to the second tape carrier package. And a female connector formed at the first connector, wherein the first signal output unit is an output pad soldered by the input pad and solder, and the second signal output unit is a male connector that is custom-fitted with the female connector. The method of claim 6, wherein the first signal input unit is a female connector formed at an end of the conductive circuit pattern connected to the first tape carrier package, and the second signal input unit is an end of the conductive circuit pattern connected to the second tape carrier package. And an input pad formed on the female connector, wherein the first signal output unit is a male connector that is customly coupled to the female connector, and the second signal output unit is an output pad soldered by the input pad and solder.