KR100623724B1 - Flexible Printed Circuit Board of Organic Electroluminescence Display Device - Google Patents

Abstract

Disclosed is a flexible printed circuit board of an organic light emitting display device including a plurality of pads having irregular patterns in order to minimize distortion of a signal generated due to cross talk. The pads having the irregular pattern vary the width, cross-sectional area or spacing between the pads and the pads according to the frequency magnitude of the transmitted signal. As a result, the spacing or impedance of the plurality of wires connected to the plurality of pads is adjusted according to the frequency of the signal. Therefore, the influence of the cross talk and noise generated between the plurality of wires is minimized, and as a result, the distortion of the signal transmitted through the respective pads and the respective wires is minimized.

Organic electroluminescent display, cross talk, signal to noise ratio (S / N), flexible printed circuit board

Description

Flexible Printed Circuit Board of Organic Electroluminescence Display Device

1 is a block diagram of an organic electroluminescent display device according to the prior art.

2 is a schematic plan view of a flexible printed circuit board according to the prior art.

3 is a plan view illustrating a panel portion and a flexible printed circuit board of the organic light emitting display device according to the first embodiment of the present invention.

4 is a plan view illustrating a panel unit and a flexible printed circuit board of the organic electroluminescent display device according to the second embodiment of the present invention.

FIG. 5 is a cross-sectional view illustrating a panel portion and a flexible printed circuit board combined with each other in the organic light emitting display device according to the third embodiment of the present invention.

FIG. 6 is a cross-sectional view illustrating a panel portion and a flexible printed circuit board combined with each other in the organic light emitting display device according to the fourth embodiment of the present invention.

The present invention relates to a flexible printed circuit board of an organic electroluminescent display, and more particularly, to a flexible printed circuit board of an organic electroluminescent display having a plurality of pads in order to minimize distortion of a signal caused by cross talk. It is about.

Recently, liquid crystal displays and organic light emitting displays have been widely used in portable information devices due to their light weight and thinness. The organic electroluminescent display device is attracting attention as a next-generation flat panel display device because it has excellent luminance characteristics and viewing angle characteristics as compared to a liquid crystal display device.

The organic electroluminescent display is a flat magnetic display that emits light by applying an electric field to a phosphor coated on a glass substrate or a transparent organic substrate. The electroluminescence refers to a phenomenon of emitting light when an electric field is applied to a phosphor made of a semiconductor.

The organic light emitting display device is classified into an active type and a passive type according to a driving method.

The passive type is a method in which an anode and a cathode are arranged in a matrix manner in a screen display area, and a pixel is formed at a portion where the anode and the cathode cross each other.

In contrast, the active type arranges a thin film transistor for each pixel and controls each pixel by using the thin film transistor.

1 is a block diagram illustrating an active organic electroluminescent display device according to the prior art.

Referring to FIG. 1, the organic light emitting display device includes a timing controller 100, a flexible printed circuit board 120, and a panel unit 140.

The panel unit 140 includes a scan driver 142, a data driver 144, and an EL panel 146.

The scan driver 142 outputs a scan signal. The scan signal is a signal for selecting pixels provided on the EL panel 146. The data driver 144 outputs a data signal to express a predetermined gray scale to the pixel selected by the scan signal, and the data signal is supplied in the form of voltage or current.

The EL panel 146 is a data line for transmitting a data signal supplied from the data driver 144, a scan line for transmitting a scan signal supplied from the scan driver 142, and the data line and the scan line. It includes a plurality of pixels 148 formed in the intersection area. The plurality of pixels 148 may include red, green, and blue sub-pixels 149.

The sub pixel 149 is formed in an area where the data line and the scan line cross each other and include a switching transistor, a driving transistor, a capacitor, and an EL element.

The switching transistor is turned on by the scan signal applied by the scan line, and the data signal is applied to the driving transistor from the data line through the turned-on switching transistor. The driving transistor provides a driving current corresponding to the data signal to be applied to the EL element.

The timing controller 100 supplies a control signal for controlling the scan driver 142 and the data driver 144, and also supplies an image data signal to the data driver 144 in the form of a digital signal.

The flexible printed circuit board 120 includes a first coupling part 121 and a second coupling part 122. The first combiner 121 is coupled to the timing controller 100, and the second combiner 122 is coupled to the panel 140, so that the flexible printed circuit board 120 is the timing controller 100. ) And the panel unit 140. As a result, the control signal and the image data signal generated by the timing controller 100 are supplied to the panel unit 140 to display a predetermined image. Hereinafter, the control signal and the image data signal are called signals.

2 is a plan view illustrating a flexible printed circuit board according to the prior art.

Referring to FIG. 2, the flexible printed circuit board 120 includes a plurality of wires 128, a plurality of pads 126, and a circuit element unit 130.

The plurality of wirings 128 are mounted on the flexible printed circuit board to provide a signal for displaying an image supplied from the timing controller 100 to the panel driver 140. It transmits to the data driver 144.

The circuit element unit 130 has a passive element or an active element. Accordingly, the circuit element 130 receives the signal transmitted from the timing controller 100, processes the received signals into signals required for light emission operation of pixels, and converts the processed signals into the panel unit. Forward to 140.

The plurality of pads 126 are connected to the plurality of wires 128, and the plurality of wires 128 are connected to the panel unit 140 to transmit the signal to the panel unit 140. The width, the cross-sectional area of each pad constituting the plurality of pads 126, and the separation distance between the pads and the pads, the spacing between the plurality of wires 128, and the thickness of the plurality of wires 128 are transmitted. All are formed regularly regardless of the frequency of the signal.

In general, the width of each pad constituting the plurality of pads 126 has a width of 100 μm, the separation distance is 100 μm, the distance between center lines between two adjacent pads is 200 μm, and the thickness of the wiring is 3000 μm to 5500 μm. A plurality of pads 126 having a regular pattern are formed.

However, when a high frequency signal is transmitted from a low frequency through the plurality of wires 128 and the pads 126 having the regular pattern as described above, crosstalk occurs between adjacent wires or pads. By crosstalk, the transmitted signal has a noise component. It is apparent to those skilled in the art that a signal having the noise component is easy to cause distortion of the signal.

Therefore, as a method for minimizing the influence of noise due to the crosstalk, a method of changing the spacing between wirings or reducing the impedance is required. That is, according to the frequency of the signal to be transmitted, it is required to minimize crosstalk by varying the width, cross-sectional area of each pad constituting the plurality of pads or the separation distance between the pad and the pad.

Summary of the Invention An object of the present invention for overcoming the above problem is a softness of an organic electroluminescent display including a plurality of pads having different pad widths, cross-sectional areas, or separation distances between pads and pads according to the frequency of a transmitted signal. To provide a printed circuit board.

The present invention for achieving the above object is mounted on an insulating film, and connected to the plurality of wires and the plurality of wires for transmitting a signal to connect the plurality of wires to an external device, Provided is a flexible printed circuit board of an organic light emitting display device including a plurality of pads varying in width depending on frequency.

In addition, the object of the present invention is mounted on an insulating film, connected to the plurality of wires and the plurality of wires for transmitting a signal to connect the plurality of wires to an external device, and to the frequency of the signal Accordingly, the present invention may also be achieved by providing a flexible printed circuit board of an organic light emitting display device including a plurality of pads having different cross-sectional areas.

In addition, the object of the present invention is mounted on an insulating film, connected to the plurality of wires and the plurality of wires for transmitting a signal to connect the plurality of wires to an external device, and to the frequency of the signal Accordingly, the present invention may also be achieved through the provision of a flexible printed circuit board of an organic light emitting display device including a plurality of pads having different distances between the pads.

In addition, the object of the present invention is mounted on an insulating film, and connected to the plurality of wires and the plurality of wires for transmitting a signal to connect the plurality of wires to an external device, the frequency magnitude of the signal It can also be achieved through the provision of a flexible printed circuit board of the organic electroluminescent display including a plurality of pads having different cross-sectional area and the separation distance between the pad and the pad.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Example 1

3 is a plan view illustrating a combination of an organic light emitting display panel unit and a flexible printed circuit board according to the first exemplary embodiment of the present invention.

Referring to FIG. 3, the flexible printed circuit board 320 includes a plurality of wires 325 and a plurality of pads 326 having different widths.

The plurality of wirings 325 are mounted on the insulating film and transmit signals for the image display supplied from the timing controller 100 to the scan driver 142 and the data driver 144 provided in the panel 140. It plays a role. The cross-sectional area of each wire may be formed differently according to the frequency of the signal.

The plurality of pads 326 are connected to the plurality of wires 325 to connect the plurality of wires 325 to the panel unit 140, and as a result, the signal supplied from the timing controller 100. Is supplied to the scan driver 142 and the data driver 144 provided in the panel unit 140 to display a predetermined image.

In addition, the plurality of pads 326 vary in width of the pad according to the frequency of the signal transmitted. That is, the signals applied to the plurality of pads 326 are in order of frequency magnitude, and therefore, the widths of the plurality of pads 326 are also formed in order of frequency magnitude.

For example, if the magnitude of the frequency is f ₀ > f ₁ > f ₂ > f ₃ >...> f _n , the width of the pad is W ₀ > W ₁ > W ₂ > W ₃ >...> W _n It may be configured to be. That is, the pad for transmitting a signal of the frequency f ₀ has a greater width than the pad for transmitting a signal of the frequency f _1, the pad for transmitting a signal of the frequency f ₁ is transmitting a signal of the frequency f ₂ It has a larger width than the pad. Therefore, the interval between the wire for transmitting the signal of frequency f ₀ and the wire for transmitting the signal of frequency f ₁ is the interval between the wire for transmitting the signal of frequency f ₁ and the wire for transmitting the signal of frequency f ₂ . Becomes bigger than Therefore, the higher the frequency of the transmitted signal, the larger the interval between the wiring for transmitting the frequency of the signal and the adjacent wiring, while the lower the frequency of the transmitted signal, the closer the wiring for transmitting the frequency of the signal The spacing between wirings becomes small. As a result, the spacing between the plurality of wires 325 is formed differently according to the frequency magnitude of the signal, thereby minimizing the influence of crosstalk and noise caused by the wires transmitting the signal.

The crosstalk is an interference phenomenon of signals generated between adjacent wires, and is inversely proportional to the square of the distance between adjacent wires. That is, an interference phenomenon of a signal occurs between a plurality of wires 325 transmitting a signal, and the interference phenomenon of the signal is strongly generated as the frequency of the transmitted signal is higher and the interval between the wires is narrower. Therefore, as in the embodiment of the present invention, by forming different intervals between the plurality of wires 325 according to the frequency magnitude of the signal, the occurrence of the crosstalk is reduced, thereby reducing the generation of noise. As a result, the signal-to-noise ratio is improved, which minimizes the distortion of the signal transmitted through the wiring.

The signal-to-noise ratio (S / N) is a measure of the relative magnitude of the signal-to-noise, and a unit called decibels is usually used.

If the intensity of the incoming signal is V _s and the noise is V _n , the signal-to-noise ratio is expressed by the following equation.

S / N = log ₁₀ (V _s / V _n )

If V _s = V _n , then S / N = 0. In other words, when the signal strength and noise are substantially the same, it is practically impossible to distinguish the signals due to the high noise level.

Therefore, it is desirable for the transmission and processing of the signal to maintain a high value of S / N because V _s is larger than V _n .

In addition, the plurality of wirings 325 may be formed by varying the cross-sectional area of each of the wirings in order of frequency magnitude of the transmitted signal. As a result, the impedance generated in the plurality of wires 325 is reduced when the signal is transmitted, thereby minimizing the loss of the transmitted signal. The result is an improved signal-to-noise ratio.

Example 2

4 is a plan view illustrating a combination of an organic light emitting display panel unit and a flexible printed circuit board according to a second exemplary embodiment of the present invention.

Referring to FIG. 4, the flexible printed circuit board 420 includes a plurality of wires 425 and a plurality of pads 426.

The plurality of wires 425 are mounted on the insulating film and transmit signals for the image display supplied from the timing controller 100 to the scan driver 142 and the data driver 144 provided in the panel 140. It plays a role. The cross-sectional area of each wire may be formed differently according to the frequency of the signal.

The plurality of pads 426 are connected to the plurality of wires 425 to connect the plurality of wires 425 to the panel unit 140, and as a result, the signal supplied from the timing controller 100. Is supplied to the scan driver 142 and the data driver 144 provided in the panel unit 140 to display a predetermined image.

In addition, the plurality of pads 426 vary a separation distance between the pads and the pads according to the frequency of the signal transmitted. At this time, the width of each pad is kept constant. That is, the signals applied to the plurality of pads 426 are in order of frequency magnitude, and thus the separation distance is also formed in order of frequency magnitude.

For example, if the magnitude of the frequency is f ₀ > f ₁ > f ₂ > f ₃ >...> f _n , the separation distance between the pad and the pad is d ₀ > d ₁ > d ₂ >...> d _n It can be configured to be _-1 . That is, the separation distance (d ₁₎ between the width of each of said pad while maintaining constant the pad to transfer the pad for transmitting a signal of the frequency f ₀ signal of the frequency f ₁ the frequency f ₁ The distance between the pad for transmitting the signal and the pad for transmitting the signal of the frequency f ₂ is greater than the distance (d ₂ ). Therefore, the interval between wiring for transmitting wiring and the signal of the frequency f ₁ to leave the spaced-apart distance of the d ₁ transmits a signal of the frequency f ₀ will leave the separation distance of the d ₂ transmits a signal of the frequency f ₁ It is formed larger than the distance between the wiring and the wiring for transmitting the signal of the frequency f ₂ . Therefore, the higher the frequency of the transmitted signal, the larger the distance between the wiring for transmitting the frequency of the signal and the adjacent wiring, while the lower the frequency of the transmitted signal, the more between the wiring for transmitting the frequency of the signal and the adjacent wiring. The spacing becomes smaller. As a result, the interval between the plurality of wires 425 for transmitting the signal is formed differently according to the frequency size of the signal, so that cross talk and noise generated during the signal transmission are minimized, thereby improving signal to noise ratio. The distortion of the signal is minimized.

In addition, the plurality of wires 425 connected to the plurality of pads 426 may also be formed by varying the cross-sectional area of each wire according to the frequency of the signal. Therefore, the impedance generated when the signal is transmitted through the plurality of wires 425 is reduced, thereby minimizing the loss of the signal that may occur during signal transmission, thereby achieving an improved signal-to-noise ratio.

Example 3

FIG. 5 is a cross-sectional view illustrating a combination of an organic light emitting display panel unit and a flexible printed circuit board according to a third exemplary embodiment of the present invention.

Referring to FIG. 5, the flexible printed circuit board 520 includes a plurality of wires (not shown) and a plurality of pads 526 having different cross-sectional areas.

The plurality of wires are mounted on the insulating film and transmit a signal for displaying an image supplied from the timing controller 100 to the scan driver 142 and the data driver 144 provided in the panel 140. Perform. The cross-sectional area of each wire may be formed differently according to the frequency of the signal.

 The plurality of pads 526 are connected to the plurality of wires to connect the plurality of wires to the panel unit 140, and as a result, the signal supplied from the timing controller 100 is the panel unit 140. ) Is supplied to the scan driver 142 and the data driver 144 to display a predetermined image.

In addition, the plurality of pads 526 vary the cross-sectional area of the pads according to the frequency magnitude of the signal transmitted. That is, the signals applied to the plurality of pads 526 are in order of frequency magnitude, and thus the cross-sectional area of the pads is also formed in order of frequency magnitude.

For example, when the frequency is f ₀ > f ₁ > f ₂ > f ₃ >...> f _n , the cross-sectional area of the pad is configured to be S ₀ > S ₁ > S ₂ >...> S _n. do. That is, the cross-sectional area of the pad to the cross-sectional area (S0) of the pad for transmitting a signal of the frequency f ₀ is larger than the cross-sectional area (S ₁₎ of the pad for transmitting a signal of the frequency f _1, transmitting a signal of the frequency f ₁ (S ₁ ) is larger than the cross-sectional area (S ₂ ) of the pad transmitting the signal of the frequency f ₂ . Thus, the higher the frequency of the transmitted signal, the larger the cross-sectional area of the pad transmitting the frequency of the signal, while the lower the frequency of the transmitted signal, the smaller the cross-sectional area of the pad transmitting the frequency of the signal.

In addition, the plurality of wires connected to the plurality of pads 526 may be formed by varying the cross-sectional area of each of the wires according to the frequency magnitude transmitted.

Therefore, the impedance generated when the signal is transmitted through the plurality of wires and the plurality of pads 526 having different cross-sectional areas according to the frequency of the signal is reduced, and as a result, may be generated when the signal is transmitted. The loss of the signal is minimized so that an improved signal to noise ratio is achieved.

Example 4

6 is a cross-sectional view illustrating a state in which an organic light emitting display panel unit and a flexible printed circuit board are coupled according to a fourth exemplary embodiment of the present invention.

Referring to FIG. 6, the flexible printed circuit board includes a plurality of wires (not shown) and a plurality of pads 626.

The plurality of wires are mounted on the insulating film, and transmit a signal for displaying an image supplied from the timing controller 100 to the scan driver 142 and the data driver 144 provided in the panel 140. Do this.

The plurality of pads 626 are connected to the plurality of wires to connect the plurality of wires to the panel unit 140, and as a result, the signal supplied from the timing controller 100 is the panel unit 140. The image is supplied to the scan driver 142 and the data driver 144 provided in the display.

In addition, the plurality of pads 626 vary the cross-sectional area of each pad and the separation distance between the pads and the pads according to the frequency magnitude of the signal. That is, the signals applied to the plurality of pads 626 are in order of frequency magnitude, and thus the cross-sectional area and the separation distance of the pads are also formed in order of frequency magnitude.

For example, if the frequency magnitude of the signal is f ₀ > f ₁ > f ₂ > f ₃ >...> f _n , then the cross-sectional area of the pad is S ₀ > S ₁ > S ₂ >...> S _n-1 And a separation distance between the pad and the pad is d ₀ > d ₁ > d ₂ >...> d _{n −1} .

That is, the frequency f ₀ the cross-sectional area of the wiring for transmitting a signal (S ₀₎ is a wiring for transmitting a signal of the frequency f ₀ is larger than the cross-sectional area (S ₁₎ of the wiring for transmitting a signal of the frequency f _1, and the distance between the wiring for transmitting a signal of frequency f ₁ (d ₀₎ is greater than the distance (d ₁₎ between the wiring and the wiring for transmitting the signal of the frequency f ₂ for transmitting a signal of the frequency f _1. Therefore, the higher the frequency of the transmitted signal, the larger the distance between the wiring for transmitting the frequency of the signal and the adjacent wiring, and the cross-sectional area of the pad connected to the wiring for transmitting the frequency of the signal also increases. As a result, the interval between the plurality of wires for transmitting the signal and the cross-sectional area of the plurality of pads 626 are formed differently according to the frequency of the signal.

In addition, the plurality of wires connected to the plurality of pads 626 may be formed by varying the cross-sectional area of each of the wires according to the frequency magnitude of the transmitted signal.

Therefore, by varying the cross-sectional area of the plurality of pads 626 and the separation distance between the pads and the pads according to the frequency of the signal, the impedance and crosstalk generated during the signal transmission are minimized, and as a result, the signal-to-noise ratio is improved. This becomes possible.

 The present invention provides a cross-section through a flexible printed circuit board of an organic light emitting display device having a plurality of pads having different widths, cross-sectional areas, or separation distances between the pads and the pads according to the frequency magnitude of the transmitted signal. Minimizing the effects of torque and the resulting noise, and also lowering the impedance, reduces the loss of the transmitted signal. Accordingly, the present invention provides a conventional pattern, i.e., a flexible printed circuit board coupling portion having a plurality of pads having the same width, the same cross-sectional area, or the same separation distance between the pads and the pads, to reduce noise generated between signals. By minimizing, an improvement in the signal-to-noise ratio is achieved.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will 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 that you can.

Claims (12)

A plurality of wirings mounted on the insulating film and configured to transmit signals; And And a plurality of pads connected to the plurality of wires to connect the plurality of wires to an external device and varying in width according to the frequency of the signal. The method of claim 1, wherein each of the pads, The greater the frequency of the signal, the wider the width of each pad is formed, the flexible printed circuit board of the organic light emitting display device. The method of claim 2, wherein each of the wiring, And the larger the frequency of the signal, the larger the cross-sectional area of each of the wirings is. A plurality of wirings mounted on the insulating film and configured to transmit signals; And And a plurality of pads connected to the plurality of wires to connect the plurality of wires to an external device and having different cross-sectional areas according to the frequency of the signal. The method of claim 4, wherein each of the pads, The greater the frequency of the signal, the greater the cross-sectional area of each pad is formed, the flexible printed circuit board of the organic light emitting display device. The method of claim 5, wherein each of the wiring, And the larger the frequency of the signal, the larger the cross-sectional area of each of the wirings is. A plurality of wirings mounted on the insulating film and configured to transmit signals; And A flexible printed circuit of an organic light emitting display device comprising a plurality of pads connected to the plurality of wires to connect the plurality of wires to an external device and varying a distance between the pads and the pads according to the frequency of the signal. Board. The method of claim 7, wherein each of the pads, The greater the frequency of the signal, the greater the distance between each pad and the pad is formed, the flexible printed circuit board of the organic light emitting display device. The method of claim 8, wherein each of the wiring, And the larger the frequency of the signal, the larger the cross-sectional area of each of the wirings is. A plurality of wirings mounted on the insulating film and configured to transmit signals; And Flexibility of an organic light emitting display device comprising a plurality of pads connected to the plurality of wires to connect the plurality of wires to an external device and varying a cross-sectional area and a separation distance between the pads and the pads according to the frequency of the signal. Printed circuit board. The method of claim 10, wherein each pad, The greater the frequency of the signal, the greater the cross-sectional area of each pad and the separation distance between each pad and the pad is formed, the flexible printed circuit board of the organic light emitting display device. The method of claim 11, wherein each of the wiring, And the larger the frequency of the signal, the larger the cross-sectional area of each of the wirings is.

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