KR100635582B1 - The organic electro luminescent display device - Google Patents

Abstract

An organic electroluminescent display device is provided to output power voltages to a panel, of which high-frequency noises are interrupted, by disposing capacitors outputting the power voltage sensitive to the noise adjacent to the panel. A panel(300) generates a scanning signal and a data signal to display a desired image according to the scanning signal and the data signal. An internal voltage generating unit supplies power voltages to the panel to generate the scanning signal and the data signal. A flexible printed circuit board(200) tests the power voltage supplied from the internal voltage generating unit to output the result to the panel. The output terminal has a terminal outputting the power voltage sensitive to a noise and a terminal outputting the power voltage resistive to the noise.

Description

Organic Electroluminescent Display Device

1 is a configuration diagram of a conventional flexible printed circuit board.

2 is a block diagram of an organic light emitting display device according to an embodiment of the present invention.

3 is a circuit diagram and an output voltage characteristic curve of an output terminal according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: control unit 200: flexible printed circuit board

300: panel 310: driving integrated circuit

320: scan driver 330: pixel part

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light emitting display device, and more particularly, to an arrangement of capacitors formed in a flexible printed circuit board, the organic light emitting display device including a panel connected to a control unit through a flexible printed circuit board. .

Recently, flat panel display devices that can replace cathode ray tubes (CRTs) have been actively researched. In particular, organic light emitting display devices have attracted attention as next-generation flat panel display devices due to their excellent luminance and viewing angle characteristics.

Unlike the liquid crystal display, the organic light emitting display device uses a light emitting diode that emits a specific light without requiring a separate light source unit. Such a light emitting diode emits light corresponding to the amount of driving current flowing into the anode electrode.

Such an organic light emitting display device includes a panel including a driving unit and a pixel unit, a controller supplying power voltages and control signals to the panel, and a flexible printed circuit board (FPCB) connecting the panel and the controller. It is composed.

Flexible printed circuit boards are excellent in heat resistance, flex resistance, and chemical resistance, and are used in many electronic components for the purpose of 3D three-dimensional wiring, miniaturization, high density wiring, thinning, and rationalization of assembly.

In the flexible printed circuit board, a base film is adhered to a surface of a reinforcing plate having predetermined rigidity, and copper foil is deposited on the surface of the base film. The flexible printed circuit board forms a required circuit by removing specific portions of the deposited copper foil by etching.

1 is a configuration diagram of a conventional flexible printed circuit board.

Referring to FIG. 1, a conventional flexible printed circuit board is disposed between a control unit and a panel to connect a printed circuit board (PCB) on which the control unit is located and a glass substrate on which the panel is formed.

The flexible printed circuit board 20 includes a voltage test unit 22 and an output unit 24.

The voltage tester 22 compares the power supply voltage applied from the control unit 10 with a reference voltage, and supplies the power supply voltage to the output unit 24.

The output unit 24 is composed of output elements C1 to C9 for outputting respective power supply voltages. The output elements C1 to C9 are composed of a plurality of capacitors which remove noise of the power supply voltage supplied from the voltage test unit 22 and supply the noise to the panel 30.

In the conventional flexible printed circuit board 20, a plurality of such capacitors C1 to C9 are arranged without regularity. The wire resistance of the lead supplying power voltage increases in proportion to its length. This line resistance generates noise in the supply voltage. Since the organic light emitting display device emits light by a small unit of current, the driving voltage has a very small range, and power supply voltages for driving the driving unit also have a problem in that malfunction occurs due to a large variation in noise due to noise.

SUMMARY OF THE INVENTION An object of the present invention to solve the above problems is to provide an organic light emitting display device which reduces noise by efficiently disposing capacitors at an output stage in a flexible printed circuit board.

The present invention for achieving the above object, the panel for generating a scan signal and a data signal, and displaying a predetermined image according to the scan signal and the data signal; An internal voltage generator configured to supply a plurality of power supply voltages for generating the scan signal and the data signal to the panel; And a flexible printed circuit board configured to test the power supply voltage supplied from the internal voltage generation unit and transfer the power supply voltage to the panel unit through an output terminal, wherein the output terminal outputs a power voltage sensitive to noise among the plurality of power voltages. A terminal is formed in a first region proximate to the panel, and a terminal for outputting a power supply voltage resistant to noise is formed in a second region farther from the panel than the first region. To provide.

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

Example

2 is a block diagram of an organic light emitting display device according to an embodiment of the present invention.

Referring to FIG. 2, an organic light emitting display device according to an exemplary embodiment of the present invention includes a controller 100, a flexible printed circuit board 200, and a panel 300.

The controller 100 is formed in the form of an integrated circuit on a printed circuit board, and is connected to the panel 300 through the flexible printed circuit board 200. The controller 100 supplies a control power supply (VCC) and control signals to the panel 300 through the flexible printed circuit board 200.

The flexible printed circuit board 200 includes a test unit 220, a first output terminal 240, and a second output terminal 260.

The test unit 220 receives the power voltages generated from the control power supply VCC supplied from the control unit 100 and the internal power generation unit 312 of the panel 300. The test unit 220 compares each input voltage with a reference voltage, and outputs the control power supply VCC and the power supply voltages to the first and second output terminals 240 and 260.

The first output terminal 240 and the second output terminal 260 include a plurality of capacitors C1 to C9 arranged perpendicularly to the direction in which the flexible printed circuit board 200 and the panel 300 are connected to each other.

The first output terminal 240 includes nine capacitors C1 to C9 formed as close as possible to the panel 300 at a predetermined distance from the test unit 220 to the panel 300.

The first capacitor C1 is supplied to the test unit 220 from the control unit 100, receives the control power VCC, and filters the same, and outputs the filtered power to the driving integrated circuit 310 of the panel 300. The first capacitor C1 is positioned in a region separated by a first distance d1 from a region connected to the panel 300 of the flexible printed circuit board 200. The control power supply (VCC) is used as the first analog reference power supply (VCI) is DC / DC switched as a reference power supply.

The second capacitor C2 is supplied to the test unit 220 from the internal power generator 312 to receive the first analog reference power VCI and to filter the internal power generator 312 of the panel 300. Will output The second capacitor C2 is positioned in a region separated by a first distance d1 from the region connected to the panel 300 of the flexible printed circuit board 200. The first analog reference power source VCI is used as an input analog power source of the first DC / DC switching unit of the internal power generation unit 312 to generate analog power output to the driving unit at different levels.

The third capacitor C3 is supplied to the test unit 220 from the internal power generation unit 312 to receive and filter the fixed voltage VCIR, and supplies the filtered power to the internal power generation unit 312 of the panel 300. . The third capacitor C3 is positioned in a region separated by a first distance d1 from the region connected to the panel 300 of the flexible printed circuit board 200. When the internal power generator 312 generates the low-level gate power and the high-level gate power VGH and VGL, the voltage fixed through the regulator to prevent the voltage from being shaken according to the control power VCC. Using the fixed voltage (VCIR).

The fourth capacitor C4 is supplied to the test unit 220 from the internal power generator 312 to receive the second analog reference power DDVDH and to filter the internal power generator 312 of the panel 300. To supply. The fourth capacitor C4 is positioned in a region separated by a first distance d1 from the region connected to the panel 300 of the flexible printed circuit board 200. The second analog reference power source DDVDH is used as an input analog power source of the second DC / DC switching unit of the internal power generation unit 312 to change the level to adjust the level of the gray level voltage Vreg output to the data driver 314. It is used to determine.

The fifth capacitor C5 is supplied from the internal power generator 312 to the test unit 220 to receive the gradation power Vreg and to filter the gray power Vreg to supply the data driver 314 of the panel 300. The fifth capacitor C5 is positioned in a region separated by a first distance d1 from the region connected to the panel 300 of the flexible printed circuit board 200. The gray power source Vreg is used as a high level analog reference voltage in the digital / analog switching unit of the data driver 314.

The sixth capacitor C6 is supplied to the test unit 220 from the internal power generation unit 312 and supplied with a third analog reference power supply VLOUT1 to filter the internal power generation unit 312 of the panel 300. To supply. The sixth capacitor C6 is positioned in a region separated by a first distance d1 from the region connected to the panel 300 of the flexible printed circuit board 200. The third analog reference power source VLOUT1 is an output power source of the second DC / DC switching unit of the internal power generation unit 312 and forms a high level gate voltage VGH.

The seventh capacitor C7 is supplied from the internal power generator 312 to the test unit 220 to receive the fourth analog reference power VLOUT2 and to filter the internal power generator 312 of the panel 300. To supply. The seventh capacitor C7 is positioned in a region separated by a first distance d1 from the region connected to the panel 300 of the flexible printed circuit board 200. The fourth analog reference power supply VLOUT2 is an output power supply of the second DC / DC switching unit of the internal power generation unit 312 and is combined with the third analog reference power supply VLOUT1 to provide the low level gate voltage VGL. Form.

The eighth capacitor C8 is supplied to the test unit 220 from the internal power generator 312 to receive and filter the gate voltage VGH having a high level, and thus to generate the internal power generator 312 of the panel 300. To supply. The eighth capacitor C8 is positioned in a region separated by a first distance d1 from the region connected to the panel 300 of the flexible printed circuit board 200. The high gate voltage VGH is used as the voltage indicating the high level of the scan signal in the scan driver 320 and needs to be a voltage level for turning on the switching transistor of the pixel.

The ninth capacitor C9 is supplied to the test unit 220 from the internal power generation unit 312 to receive and filter the low-level gate voltage VGL, and thus to generate the internal power generation unit 312 of the panel 300. To supply. The ninth capacitor C9 is positioned in a region separated by a first distance d1 from a region connected to the panel 300 of the flexible printed circuit board 200. The low-level gate voltage VGL is used as a voltage representing the low level of the scan signal in the scan driver 320 and needs to be a voltage level for turning off the switching transistor of the pixel.

Nine capacitors C1 to C9 of the first output terminal 260 are located in a region separated by the first distance d1 from the region connected to the panel 300 in the flexible printed circuit board 200 and the first distance ( d1) needs to be the shortest distance to form an element from the flexible printed circuit board 200 to the panel 300 side.

As described above, when the output capacitor C1 is formed at the shortest distance d1 from the panel 300 side, the length of the conducting wire from the capacitor C1 to the panel 300 becomes short. Therefore, the power sources whose noise is filtered by the capacitor C1 include the minimum noise generated between the capacitor C1 and the panel 300.

The second output terminal 240 is positioned in the region separated by the second distance d2 from the region connected to the panel 300 on the flexible printed circuit board 200. The capacitors forming the second output terminal 240 are supplied to the panel 300 after filtering and receiving power that is less sensitive to noise than the capacitors C1 to C9 forming the first output terminal 260.

The panel 300 includes a pixel unit 330, a scan driver 320, and a driver integrated circuit 310.

The pixel portion 330 is composed of a plurality of pixels formed in an area defined by the scan line and the data line. The pixel unit 330 supplies a data signal to pixels activated by a scan signal supplied from the scan driver 320 to display an image corresponding to the applied data signal.

The scan driver 320 receives a clock signal and a start pulse from the driver integrated circuit 310, and sequentially supplies scan signals having high and low gate voltages VGH and VGL to the pixel unit 330.

The driving integrated circuit 310 includes an internal power generator 312 and a data driver 314.

The internal power generator 312 receives control powers and reference powers from the first and second output terminals 240 and 260 of the flexible printed circuit board 200 and supplies a plurality of power through the DC / DC switching unit and the gate voltage generation circuits. Output power supply voltages.

The first DC / DC switching unit receives the first analog reference power supply VCI from the first output terminal 260 to convert the AC signal into an AC signal and outputs the DC signal at a different level.

The second DC / DC switching unit receives a second analog reference power source (DDVDH) from the first output terminal 260, converts the signal into an AC signal, and changes the level so that the third and fourth analog reference power sources VLOUT1 and VLOUT2 are DC signals. ) And the gray voltage Vreg.

The gate voltage generation circuit receives a fixed power supply (VCIR) from a regulator, and receives a third and fourth analog reference power supplies VLOUT1 and VLOUT2 from a DC / DC switch and receives a high level gate voltage and a low level gate voltage ( VGH, VGL).

The data driver 314 receives a plurality of power voltages from the internal power generator 312, receives control signals from a timing controller (not shown), and converts the supplied data into analog data signals to each data line. Supply.

3 is a circuit diagram and an output voltage characteristic curve of an output terminal according to an embodiment of the present invention.

Referring to FIGS. 3A and 3B, a line resistance (Rin) is generated in proportion to the length of the conductive wire connected from the test unit 220 to the first output terminal 260. This line resistance Rin operates as a capacitor C1 and an RC filter of the first output terminal 260. The RC filter is a low pass filter that transmits only a low frequency signal to the panel 300. Noise generated by the line resistance (Rin) is a high frequency, the power supply voltage of the panel 300 is an AC signal having a low frequency or a direct current signal, so the RC filter cuts out noise of high frequency and outputs power. The noise cut-off power source may include noise by the line resistance Rout according to the distance between the capacitor C1 and the panel 300, but the distance between the capacitor C1 and the panel 300 is minimized. Noise will also be minimized.

Therefore, as shown in FIG. 3B, the transfer function Vout / Vin has a value of about 1 in the low pass band, and the characteristic frequency W1 is a line resistance Rin from the test unit 220 to the capacitor C1. Inversely proportional to Therefore, since the distance d1 from the capacitor C1 to the panel 300 is minimized, the line resistance Rin from the test unit 220 to the capacitor C1 is maximized, so that the characteristic frequency W1 is Decreases. That is, since the RC filter has a narrower pass band, the RC filter can block a wide range of noises and transmit stable power to the panel 300.

According to the present invention as described above, among the capacitors of the output terminal formed on the flexible printed circuit board, capacitors for outputting a noise-sensitive power supply voltage to the panel is disposed adjacent to the panel. Accordingly, the low frequency power supply voltages and the DC power supplies, from which the high frequency noises are blocked, can be output to the panel.

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 (5)

A panel for generating a scan signal and a data signal and displaying a predetermined image according to the scan signal and the data signal; An internal voltage generator configured to supply a plurality of power supply voltages for generating the scan signal and the data signal to the panel; And And a flexible printed circuit board for testing the power supply voltage supplied from the internal voltage generation unit and transferring the power voltage to the panel unit through an output terminal. The output terminal has a terminal for outputting a noise-sensitive power supply voltage among the plurality of power supply voltages in a first region proximate to the panel, and a terminal for outputting a power supply voltage that is resistant to noise is less than the first region from the panel. An organic light emitting display device, wherein the organic light emitting display device is formed in a second area that is remote. The organic light emitting display device as claimed in claim 1, wherein the output terminal has capacitors for storing and outputting respective power supply voltages. The organic light emitting display device as claimed in claim 2, wherein the capacitors of the output terminal are disposed in a direction perpendicular to a connection direction between the panel and the flexible printed circuit board. The organic light emitting display device as claimed in claim 3, wherein the terminals formed in the first region of the output terminal output an analog reference voltage, a gray reference voltage, and a gate voltage of high level and low level. The organic light emitting display device as claimed in claim 4, wherein the internal power generation unit is formed on the panel.

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