KR100983523B1 - Flexible printed circuits board, and flat panel display device having the same - Google Patents

Abstract

Disclosed are a multi-sided flexible printed circuit board and a flat panel display having the same. The first flexible printed circuit board converts the first image signal and the first timing signal into second and third image signals and the second and third timing signals, respectively, and outputs the rigid printed circuit board. Electrically connected to the substrate, generating a common electrode voltage and a gamma voltage based on the second and third image signals and the second and third timing signals, and generating the second and third image signals and the second and third timings. A signal, a common electrode voltage and a gamma voltage, and the second flexible printed circuit board is electrically connected between the rigid printed circuit board and the display panel so that the second and third image signals, the second and third timing signals, The common electrode voltage and the gamma voltage are provided to the display panel. Thereby, by providing the image signal processing function and the timing control function to the flexible printed circuit board, it is possible to eliminate the defect phenomenon caused by the connecting body generated in the flat panel display device.

Flat Panel, Liquid Crystal, Flexible, Hard, FPCB, Multifaceted

Description

FLEXIBLE PRINTED CIRCUITS BOARD, AND FLAT PANEL DISPLAY DEVICE HAVING THE SAME

1A and 1B are diagrams for explaining an example of a general liquid crystal display device.

2A and 2B illustrate another example of a general liquid crystal display.

3A to 3C are diagrams for describing the flat panel display device according to the present invention.

4 is a logic block diagram illustrating the liquid crystal display device according to the present invention described above.

5 is a cross-sectional view schematically illustrating an example of the first flexible printed circuit board.

6 is a cross-sectional view schematically illustrating another example of the first flexible printed circuit board.

<Description of the symbols for the main parts of the drawings>

110: first flexible printed circuit board 112: interface

114: timing controller 116: DC-DC converter                 

120: rigid printed circuit board 122: data driver

124: common electrode voltage generator 126: gamma voltage generator

130: second flexible printed circuit board 140: display panel

150: backlight assembly

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible printed circuit board and a flat panel display having the same, and more particularly, to a flexible printed circuit board having a multi-faceted structure and a flat panel display having the same.

Recently, display devices are also required to be lighter and thinner in accordance with the light weight and thickness of personal computers and televisions. Flat panel display devices are being developed.

The liquid crystal display device obtains a desired image signal by applying an electric field to a liquid crystal having an anisotropic dielectric constant injected between two substrates, and controlling the amount of light transmitted through the substrate by adjusting the intensity of the electric field. It is a display device.

1A and 1B are views for explaining an example of a general liquid crystal display device. In particular, FIG. 1A shows a rear view of the liquid crystal display device, and FIG. 1B shows a side view of the liquid crystal display device.                         

As shown in FIGS. 1A and 1B, the general liquid crystal display device 10 includes a data driver 14 and a gate driver 16 disposed on the rear surface of the liquid crystal panel 12 separately from the liquid crystal panel 12. Has In this case, the data driver 14 and the gate driver 16 may be bent to be disposed on the back side of the backlight assembly 18.

2A and 2B are views for explaining another example of a general liquid crystal display device. In particular, FIG. 2A shows a rear view of the liquid crystal display device, and FIG. 2B shows a side view of the liquid crystal display device.

As shown in FIG. 2A and FIG. 2B, the gate driver part (not shown) is mounted in the liquid crystal panel 22, and it has another data driver part 24. As shown in FIG. In this case, it is preferable that the data driver is bent and disposed on the back side of the backlight assembly 26.

In particular, the above-described structure shown in FIGS. 2A and 2B is a structure generally employed in a monitor, and is a flexible printed circuits board (FPCB) as a connection between a substrate 28 and a data driver for image signal and timing signal processing. (29) is used.

However, in this structure, not only the man-hours increase due to the bonding operation for connecting the FPCB 29, but also the manufacturing cost increases because a rework process is accompanied by raw material defects.

Accordingly, the technical problem of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a flexible printed circuit board having a multi-sided structure for removing a defect caused by a connection generated in a flat panel display device. .

Another object of the present invention is to provide a flat panel display device having the flexible printed circuit board having the above-described multi-sided structure.

According to one aspect for realizing the above object of the present invention, a flexible printed circuit board having a multi-faceted structure includes a rigid printed circuit board, a flexible printed circuit board electrically connected to the rigid printed circuit board, and the flexible printed circuit board. In a flexible printed circuit board for providing an image signal and a timing signal to a flat panel display device including a display panel electrically connected to the flexible printed circuit board, the flexible printed circuit board is formed on a film of a flexible material, and is connected to an external host to the first An interface to receive an image signal and a first timing signal; It is formed on the film of the flexible material, and converted into the second and third image signal and the second and third timing signal based on the first image signal and the first timing signal, respectively, on the rigid printed circuit board An output timing controller; And a DC-DC converter formed on the film of the flexible material and converting a power supply voltage provided from the outside into a plurality of power supply voltages and outputting the plurality of power supply voltages to the rigid printed circuit board.

In addition, a flat panel display device according to one aspect for realizing the above object of the present invention includes a display panel; And a first flexible printed circuit configured to convert the first image signal provided from the outside and the first timing signal corresponding to the first image signal into second and third image signals and second and third timing signals, respectively. Board; Is electrically connected to the first flexible printed circuit board, generates a common electrode voltage and a gamma voltage based on the second and third image signals and second and third timing signals, and generates the second and third image signals. A rigid printed circuit board configured to output the second and third timing signals, the common electrode voltage, and the gamma voltage; And a data driving IC and electrically connected between the rigid printed circuit board and the display panel, the second and third image signals, the second and third timing signals, the common electrode voltage, and the gamma voltage. And a second flexible printed circuit board provided to the display panel.

According to such a flexible printed circuit board having a multi-sided structure and a flat panel display device having the same, a defective phenomenon caused by a connection generated in the flat panel display device can be eliminated by providing an image signal processing function and a timing control function to the flexible printed circuit board. have.

Hereinafter, with reference to the accompanying drawings, it will be described in detail the present invention.

3A to 3C are diagrams for describing the flat panel display device according to the present invention. In particular, FIG. 3A is a rear view of the flat panel display, FIG. 3B is a side view of the flat panel display, and FIG. 3C is a plan view for explaining the first flexible printed circuit board.

First, referring to FIGS. 3A and 3B, the flat panel display 100 may include a first flexible printed circuit board (FPCB) 110 and a rigid printed circuit board (PCB) 120. , A second flexible printed circuit board 130, and a display panel 140. If the flat panel display is a liquid crystal display, it is preferable to further include a separate backlight assembly 150 on the back of the display panel.

The first flexible printed circuit board 110 includes an interface 112 for connecting to an external host, a timing controller 114 for processing a signal provided from the host, and a rigid printed circuit board 120. The signal is electrically connected and output by the timing controller 114. The first flexible printed circuit board 110 is preferably electrically connected to the central portion (ie, the center) of the rigid printed circuit board 120.

In particular, the above-described flexible printed circuit board is an electronic component developed while miniaturizing and lightening electronic products. The flexible printed circuit board is excellent in workability, has high heat resistance, high bending resistance, chemical resistance, and strong heat resistance. It is widely used as a core component. In other words, the above-described flexible printed circuit board can be three-dimensional wiring alone, it is possible to reduce the size and weight of the device, and has durability against repeated bending.

In addition, the above-described flexible printed circuit board is capable of high-density wiring, no wiring errors, good assembly, high reliability, and a continuous production method.

As shown in FIG. 3C, the adhesive part of the first flexible printed circuit board 110, that is, the adhesive part corresponding to the rigid printed circuit board, is preferably designed in a cross section in consideration of rounding during assembly, and the image signal And the region in which the timing controller having the timing signal conversion function is mounted, that is, the region except for the adhesive portion, are preferably designed on both sides in consideration of productivity.

The rigid printed circuit board 120 has a width equal to the thickness of the display panel 140, and is electrically connected to the first flexible printed circuit board 110 and electrically connected to the second flexible printed circuit board 130. do.

The second flexible printed circuit board 130 may be electrically connected between the rigid printed circuit board 120 and the display panel 140 by mounting at least one data driver IC. In particular, when assembling, the second rigid printed circuit board 130 and the display panel 140 have a predetermined angle, for example, an angle of 90 degrees, and thus are curved.

As such, in the case of a product using a connector such as a connector generated in a flat panel display device, a substantial cause of a large number of defects can be eliminated, and cost can be reduced by simplifying the process. In addition, by applying a hybrid type component equipped with components, it is possible to highlight the image of the smart flat panel display device, and to reduce the size of the rigid printed circuit board that transmits the image signal, thereby reducing the material cost.

Then, the liquid crystal display of the flat panel display described above is described as one example.

4 is a logic block diagram illustrating the liquid crystal display device according to the present invention described above. Referring to FIG. 4, the liquid crystal display device 100 includes a first flexible printed circuit board 110, a rigid printed circuit board 120, a second flexible printed circuit board 130, and a display panel 140. The same reference numerals are given to the same components as compared with FIG. 3 described above.

An interface 112, a timing controller 114, and a power converter 116 are mounted on the first flexible printed circuit board 110 to receive a first image signal and a first timing signal corresponding to the first image signal from the outside. The second and third image signals and the second and third timing signals are respectively converted and output to the rigid printed circuit board 120. Here, the power conversion unit 116 is preferably a DC-DC converter for converting the provided DC power to one or more boosted or reduced DC power output.

In addition, the DC-DC converter 116 mounted on the first flexible printed circuit board 110 converts DC power provided from the outside into a plurality of DC power, and converts the converted DC power to the rigid printed circuit board 120. And supply to the second flexible printed circuit board 130 and the display panel 140, respectively.

The data driver 122, the common electrode voltage generator 124, and the gamma voltage generator 126 are mounted on the rigid printed circuit board 120 to be electrically connected to the first flexible printed circuit board 110. Generate a common electrode voltage Vcom and a gamma voltage based on the second and third image signals and the second and third timing signals, and generate the second and third image signals, the second and third timing signals, and The common electrode voltage and the gamma voltage are output to the second flexible printed circuit board 130.

The second flexible printed circuit board 130 is equipped with a data driver IC to be electrically connected between the rigid printed circuit board 120 and the display panel 140, and the second and third image signals and the second and third image signals. The third timing signal, the common electrode voltage Vcom, and the gamma voltage are provided to the display panel 140. In particular, as shown in the drawing, the second flexible printed circuit board 130 may be provided in plural for the connection of the rigid printed circuit board 120 and the display panel 140, and each of the second flexible printed circuit boards may be provided. It is preferable that one data driving IC is mounted on the substrate 130.                     

The display panel 140 is an array substrate disposed below two substrates used in the liquid crystal panel. The display panel 140 includes a switching element formed in a region defined by a plurality of gate lines GL and data lines DL, and the switching element. The liquid crystal capacitor Clc connected to the storage capacitor Cst is defined to define an effective display area 142, and the gate line is formed on an invalid display area 144 formed outside the effective display area 142. A gate driver portion for sequentially supplying a scan signal to GL is formed.

Next, various examples of the above-described first flexible printed circuit board having a cross-sectional structure and a multi-side structure will be described with reference to the accompanying drawings.

5 is a cross-sectional view schematically illustrating an example of the first flexible printed circuit board. As shown in FIG. 5, the first flexible printed circuit board according to an example includes a cross-section 210 for connecting with the rigid printed circuit board 120 and a double-sided portion 220 for connecting with an external host. Is made of.

The cross section 210 includes a first base film 212, a first conductive path 214, and a first protective layer 216. Specifically, a first conductive path 214 is formed on the first base film 212 made of polyimide, a first protective layer 216 is formed on the first conductive path 214, and the first protective layer is formed. In some regions of the layer 216, a first region 218 is formed for mounting various ICs or single components. Given that the IC or devices typically have leads, the leads are bonded to the first region 218.                     

The first conductive path 214 is a kind of signal line, one end of which is connected to both sides to receive a predetermined signal from the both sides, and the other end of the various ICs or single components mounted on the first region 218. The predetermined signal is transmitted to the device or the like.

The double sided part 220 includes a second base film 221, a second conductive path 222, a second protective layer 223, a third conductive path 225, and a third protective layer 226. Specifically, a second conductive path 222 is formed on the second base film 221 made of polyimide, a second protective layer 223 is formed on the second conductive path 222, and the second protective layer. In some regions of the layer 223, a second region 224 for mounting various ICs or single components is formed.

In addition, a third conductive path 225 is formed under the second base film 221, a third protective layer 226 is formed under the third conductive path 225, and the third protective layer 226 is formed. The third region 227 for mounting various ICs, single components, or the like is formed in a portion of the region.

In particular, since both sides of the double-sided part 220 can be soldered in a state where the operation is bonded up and down, both lands can be formed, thereby increasing the part density at the same size when mounting the part.

6 is a cross-sectional view schematically illustrating another example of the first flexible printed circuit board. As illustrated in FIG. 6, the first flexible printed circuit board according to another example includes a cross-section 310 for connection with the rigid printed circuit board 120 and a double-sided portion 320 for connection with an external host. )                     

The cross section 310 includes a first base film 312, a first conductive path 314, and a first protective layer 316. Specifically, a first conductive path 314 is formed on the first base film 312 made of polyimide, a first protective layer 316 is formed on the first conductive path 314, and the first protective layer. In some regions of the layer 316, a first region 318 is formed for mounting various ICs or single components.

The double sided part 320 includes a second conductive path 324, a second protective layer 326, and a third protective layer 322. In detail, a second protective layer 326 is formed on the second conductive path 324, and a second region for mounting various ICs or a single element in a part of the second protective layer 326 is formed. 327 is formed, and a third passivation layer 322 is formed under the second conductive path 324, and a portion of the third passivation layer 322 may be mounted with various ICs or a single element. The third region 323 is formed.

In particular, the double-sided portion 320 is a raw material of the copper foil itself without a separate base film. In this case, bonding the protective layers 323 and 327 both up and down is similar to the double-sided portion described with reference to FIG. 5, but in the case of the double-sided portion described with reference to FIG. Forming, and going through the process of adhering the upper protective layer.

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

As described above, according to the present invention, by providing the image signal processing function and the timing control function to the flexible printed circuit board, it is possible to eliminate the defective phenomenon caused by the connecting body generated in the flat panel display device. In particular, the manufacturing side which manufactures a monitor, a TV, etc. using a liquid crystal display device can be thinner and can reduce assembly labor, and can supply a cheaper product.

Claims (10)

delete delete Display panel; A first flexible printed circuit board converting and outputting a first image signal provided from the outside and a first timing signal corresponding to the first image signal into second and third image signals and second and third timing signals, respectively. ; Is electrically connected to the first flexible printed circuit board, generates a common electrode voltage and a gamma voltage based on the second and third image signals and second and third timing signals, and generates the second and third image signals. A rigid printed circuit board configured to output the second and third timing signals, the common electrode voltage, and the gamma voltage; And A data driver IC is electrically connected between the rigid printed circuit board and the display panel, the second and third image signals, the second and third timing signals, the common electrode voltage and the gamma voltage; A second flexible printed circuit board provided to the display panel, The first flexible printed circuit board includes a power conversion unit converting a power supply voltage supplied from the outside into a plurality of power supply voltages and outputting the power supply voltages to the rigid printed circuit board. The method of claim 3, wherein the first flexible printed circuit board, Flexible film; A first conductive path formed in a portion of one surface of the film; A first protective layer covering the first conductive path while opening a portion of the first conductive path; A second conductive path formed in a portion of the other surface of the film; A second protective layer covering the second conductive path while opening a portion of the second conductive path; A third conductive path formed on another part of the other surface of the film; And And a third protective layer covering the third conductive path while opening a portion of the third conductive path. The method of claim 3, wherein the first flexible printed circuit board, Flexible film; A first conductive path formed in a portion of one surface of the film; A first protective layer covering the first conductive path while opening a portion of the first conductive path; A second conductive path formed on the same plane as the plane on which the first conductive path is formed; A second protective layer covering one surface of the second conductive path while opening a portion of the second conductive path; And And a third passivation layer covering the other surface of the second conductive path while opening a portion of the second conductive path. The method of claim 3, wherein the first flexible printed circuit board, An interface connected to an external host to receive the first image signal and the first timing signal; And And a timing controller converting the second and third image signals into the second and third timing signals based on the first image signal and the first timing signal and outputting the second and third image signals, respectively. The flat panel display of claim 3, wherein the first flexible printed circuit board is connected to a center of the rigid printed circuit board. The method of claim 3, wherein the second flexible printed circuit board, Flexible film; A data driving IC mounted on the film; And And a conductive path connected to a lead of the data driver IC. The flat panel display of claim 3, wherein the display panel is a liquid crystal panel including an array substrate, an opposing substrate, and a liquid crystal layer formed between the array substrate and the opposing substrate. 10. The flat panel display of claim 9, wherein the rigid printed circuit board is a source printed circuit board for providing the second image signal and the second timing signal to the display panel corresponding to the sidewalls of the display panel. Device.

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