CN1917019A - Light-emitting diode panel and driving method thereof - Google Patents

Abstract

A light emitting diode panel comprises a plurality of data lines, a plurality of scanning lines, a plurality of pixels, a plurality of sampling voltage lines and a plurality of compensation voltage lines; the sampling voltage line generates a compensation voltage according to a compensation signal input by the data line and threshold voltages of the driving transistor and the light emitting unit of the connected pixel, and the corresponding compensation voltage line adjusts the data signal received by the pixel connected with the same scanning line according to the compensation voltage.

Description

Light-emitting diode panel and driving method thereof

technical field

The invention relates to a panel, in particular to a light emitting diode panel and a driving method thereof.

Background technique

In an active matrix LED panel, a large number of pixels in the matrix are used to display an image, and the brightness of each pixel is controlled according to a data signal. Generally, each pixel has a bias switch, a storage capacitor, a driving transistor and a light emitting diode. When the scan line applies a scan signal to the control terminal of the bias switch, the bias switch can be turned on, and the data line inputs a data signal through the bias switch to charge the energy storage capacitor. Then, when the scan line stops applying the scan signal, the bias switch is turned off, and the drive transistor is electrically isolated from the data line, and the gate voltage of the drive transistor can be maintained stably by writing the data signal into the energy storage capacitor in advance. hold the voltage of this data signal. At this time, according to the voltage between the gate and the source of the driving transistor, a driving current is generated through the driving transistor to flow through the light-emitting diode, and the light-emitting diode continuously generates brightness according to the magnitude of the passing driving current.

Among them, due to the inconsistency in the process and the difference in the attenuation degree of the material over time, when the same voltage signal is input, different driving currents are generated, thus causing uneven brightness of the panel.

In the known technology, a circuit with the function of compensating the threshold voltage is generally added to the circuit structure of the pixel. In the known technology, a circuit with the function of compensating the threshold voltage is generally added to the circuit structure of the pixel. Although many compensation circuits to improve this problem have been proposed (please refer to Taiwan Patent No. I237913 and U.S. Patent No. 6859103), because these known pixel circuits with the function of compensating threshold voltage are mainly by adding transistors and current sources , and change the original component circuit design to achieve threshold voltage compensation. However, due to the increase of components, the circuit in the pixel is too complicated, so that the aperture ratio is too low, and if it is applied to a panel, the brightness will be insufficient. Furthermore, the conventional pixel circuit needs to use more complicated control signals, so it is more difficult to control.

Contents of the invention

In view of the above problems, the main purpose of the present invention is to provide an LED panel and its driving method, so as to solve the problem of threshold voltage compensation disclosed in the prior art.

To achieve the above purpose, the LED panel disclosed in the present invention includes a plurality of data lines, a plurality of scan lines, a plurality of pixels, a plurality of sampling voltage lines and a plurality of compensation voltage lines.

The data line and the scan line intersect in an insulated manner to define pixels, and the pixels on the same scan line are connected to a sampling voltage line and a compensation voltage line corresponding to each other.

The sampling voltage line generates a compensation voltage according to the compensation signal input by the data line and the threshold voltage of the driving transistor of the connected pixel and the light-emitting unit, and the corresponding compensation voltage line adjusts the received voltage received by the pixel connected to the same scanning line according to the compensation voltage. data signal.

Each compensation circuit may include a compensation capacitor, a sampling switch, a first switch and a second switch. Wherein, the sampling switch is connected between the sampling voltage line and the first end of the compensation capacitor Cc, the first switch is connected between the first end of the compensation capacitor and the ground, and the second switch is connected between the second end of the compensation capacitor and the ground, And the second end of the compensation capacitor is connected to the compensation voltage line.

Furthermore, a reset switch can be connected across the compensation capacitor to reset the compensation capacitor.

Herein, it also includes: a switch controller. The switch controller can generate control signals according to the types of the reset switch, the sampling switch, the first switch and the second switch in the compensation circuit to control the operation of the compensation circuit.

Also, these control signals can be generated by scanning signals.

The driving method of the light emitting diode panel disclosed in the present invention, the light emitting diode panel has a plurality of pixels connected between a plurality of data lines and a plurality of scanning lines, each pixel includes a light emitting unit, a driving transistor and a bias switch, the The driving method includes: using a bias switch to input a compensation signal from the data line to turn on the driving transistor to allow current to flow through the light-emitting unit; generating a compensation voltage according to the threshold voltage of the driving transistor and the light-emitting unit of the pixels on the same scanning line; Inputting a data signal from the data line by using the bias switch; adjusting the data signal received by the pixels connected to the same scanning line according to the compensation voltage; and using the adjusted data signal to turn on the driving transistor to drive the light emitting unit.

According to the driving method of the light emitting diode panel disclosed in the present invention, the light emitting diode panel has a plurality of pixels connected between a plurality of data lines and a plurality of scanning lines, and each pixel includes: a light emitting unit, a driving transistor and a bias switch. The driving method includes: using a bias switch to input a compensation signal from the data line, so that the driving transistor is turned on and the current is allowed to flow through the light emitting unit; The first end of the external compensation capacitor forms a compensation voltage; the bias switch is used to input a data signal from the data line; according to the compensation voltage, the data signal received by the pixel connected to the same scanning line is adjusted through the second end of the external compensation capacitor ; and using the adjusted data signal to turn on the driving transistor to drive the light emitting unit.

Regarding the features and implementation of the present invention, preferred embodiments are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

1 is a schematic diagram of a light emitting diode panel according to an embodiment of the present invention;

2 is a schematic diagram of an embodiment of a light emitting diode panel according to an embodiment of the present invention;

3 is a schematic diagram of a partial circuit structure of a light emitting diode panel according to the present invention;

4A to 4D are schematic diagrams of the operation of the compensation circuit shown in "Fig. 6";

5 is a schematic diagram of a partial circuit structure of a light emitting diode panel according to the present invention;

6 is a schematic diagram of a partial circuit structure of a light emitting diode panel according to the present invention;

7 is a schematic diagram of a partial circuit structure of a light emitting diode panel according to the present invention;

8A is a schematic diagram of a partial circuit structure of a light emitting diode panel according to the present invention;

8B is a schematic diagram of a partial circuit structure of a light emitting diode panel according to the present invention;

8C is a schematic diagram of a partial circuit structure of a light emitting diode panel according to the present invention;

8D is a schematic diagram of a partial circuit structure of a light emitting diode panel according to the present invention;

9 is a schematic diagram of a partial circuit structure of a light emitting diode panel according to the present invention;

10A is a schematic diagram of an embodiment of a switch controller in an LED panel according to the present invention;

10B is a schematic diagram of an embodiment of a switch controller in an LED panel according to the present invention;

10C is a schematic diagram of an embodiment of a switch controller in an LED panel according to the present invention;

11A is a schematic diagram of an embodiment of a switch controller in an LED panel according to the present invention;

11B is a schematic diagram of an embodiment of a switch controller in an LED panel according to the present invention;

11C is a schematic diagram of an embodiment of a switch controller in an LED panel according to the present invention;

12A is a schematic diagram of an embodiment of a switch controller in an LED panel according to the present invention;

12B is a schematic diagram of an embodiment of a switch controller in an LED panel according to the present invention;

12C is a schematic diagram of an embodiment of a switch controller in an LED panel according to the present invention;

13A is a schematic diagram of an embodiment of a switch controller in an LED panel according to the present invention;

13B is a schematic diagram of an embodiment of a switch controller in an LED panel according to the present invention;

13C is a schematic diagram of an embodiment of a switch controller in an LED panel according to the present invention;

14A is a schematic diagram of an embodiment of a compensation circuit in an LED panel according to the present invention;

Fig. 14B is a waveform diagram of each signal in the switch controller of "Fig. 14A";

15A is a schematic diagram of an embodiment of a compensation circuit in an LED panel according to the present invention;

Fig. 15B is a waveform diagram of each signal in the switch controller of "Fig. 15A";

16A is a schematic diagram of an embodiment of a compensation circuit in an LED panel according to the present invention;

Fig. 16B is a waveform diagram of each signal in the switch controller of "Fig. 16A";

FIG. 17 is a flow chart of a method for driving a light emitting diode panel according to an embodiment of the present invention;

FIG. 18 is a flow chart of a method for driving a light emitting diode panel according to an embodiment of the present invention;

FIG. 19 is a flowchart of a method for driving a light emitting diode panel according to an embodiment of the present invention;

20 is a flow chart of a method for driving a light emitting diode panel according to an embodiment of the present invention;

FIG. 21 is a partial flowchart of a method for driving a light emitting diode panel according to an embodiment of the present invention;

22 is a flow chart of a driving method of a light emitting diode panel according to an embodiment of the present invention; and

FIG. 23 is a partial flow chart of a method for driving an LED panel according to an embodiment of the present invention.

Description of reference symbols

10...................LED panel

201～20(n-1), 20n...... Compensation circuit

30....................Switch Controller

31....................Inverter

32.....................shifter

33.....................Buffer

Cc......................Compensation capacitance

Cs......................Storage capacitor

DL1～DLm......Data line

Data...................Data signal

i..............Small current

I....................Drive current

LU...................Light-emitting unit

N1...................First end

N2...................Second terminal

N3....................Node

P...................Pixels

Sn, S(n-1)........Scan signal

S1n, S1(n-1), S1(n-2)...control signals

S2n...................Control signal

S3n....................Control signal

SL1～SLn... Scanning line

SW1...................First switch

SW2................................Second switch

SWb................... Bias switch

SWr................................Reset switch

SWs................................Sampling switch

T....................Drive Transistor

VcL1～VcLn.......Compensation voltage line

VsL1～VsLn....... Sampling voltage line

V...................Constant voltage

VDD voltage source

Detailed ways

Specific embodiments are given below to describe the content of the present invention in detail, and the accompanying drawings are used as auxiliary descriptions. The symbols mentioned in the description are reference symbols.

Referring to "Fig. 1", Fig. 1 shows an LED panel according to the present invention, the LED panel 10 has a plurality of data lines DL1-DLm, a plurality of scanning lines SL1-SLn, a plurality of pixels P, and a plurality of sampling voltage lines VsL1 ~VsLn and multiple compensation voltage lines VcL1~VcLn.

The data lines DL1˜DLm and the scan lines SL1˜SLn intersect in an insulated manner to define a pixel P. As shown in FIG.

The sampling voltage lines VsL1 ˜ VsLn are respectively connected to a horizontal line of pixels P. The compensation voltage lines VcL1-VcLn respectively correspond to the sampling voltage lines VsL1-VsLn, and are connected to the same pixels as the corresponding sampling voltage lines.

In other words, the pixels P on the same scan line are connected to a corresponding sampling voltage line and a compensation voltage line.

Here, each data line is used to input a compensation signal or a data signal, and each scan line is used to input a scan signal. The sampling voltage line generates a compensation voltage according to the compensation signal and the threshold voltage of the driving transistor (not shown in the figure) and the light emitting unit (not shown in the figure) connected to the pixel P, and the corresponding compensation voltage line is adjusted according to the compensation voltage The data signal input to the pixel P to which it is connected.

Referring to FIG. 2 , corresponding sampling voltage lines VsL1-VsLn and compensation voltage lines VcL1-VcLn are respectively connected to compensation circuits 201-20n, that is, each compensation circuit is connected to a sampling voltage line and its corresponding compensation voltage line. In other words, a compensation circuit can be used to compensate the threshold voltages of transistors in a whole row of pixels, ie, pixels connected to the same scan line. In actual production, the compensation circuit can be designed in the non-luminous area of the original panel, or as a component outside the panel.

Referring to FIG. 3 , each pixel P has a bias switch SWb, a storage capacitor Cs, a driving transistor T and a light emitting unit LU. The gate of the driving transistor T is connected to the bias switch SWb, and the drain and source are respectively connected to the voltage source VDD and the light emitting unit LU. The control terminal of the bias switch SWb is connected to the scan line, so as to conduct the connected data line and the control terminal of the driving transistor T according to the scan signal of the connected scan line. The driving transistor T turns on the voltage source VDD and the light emitting unit LU according to the signal from the bias switch SWb, so as to control the amount of current flowing through the light emitting unit LU. The energy storage capacitor Cs is connected between the compensation voltage line and the control terminal of the driving transistor T to store the input data signal. Wherein, the light emitting unit can be a light emitting diode (LED) or an organic light emitting diode (OLED).

Each compensation circuit includes a compensation capacitor Cc, a sampling switch SWs, a first switch SW1 and a second switch SW2. A compensation circuit can use an external compensation capacitor to compensate the threshold voltage of transistors in a whole column of pixels, that is, an external compensation capacitor can be used to compensate pixels connected to the same scanning line.

Taking the nth scanning line SLn as an example, the sampling switch SWs of the compensation circuit 20n is connected between the sampling voltage line VsLn and the first terminal N1 of the compensation capacitor Cc, and the first switch SW1 is connected between the first terminal N1 and the first terminal N1 of the compensation capacitor Cc. Between the ground, the second switch SW2 is connected to the second terminal N2 of the compensation capacitor Cc and the ground, and the second terminal N2 of the compensation capacitor Cc is connected to the compensation voltage line VcLn.

Taking the nth scanning line SLn as an example, referring to "FIG. 4A", when the data lines DL1-DLm input the compensation signal to the pixel P on the nth horizontal line, the sampling switch SWs and the second switch SW2 of the compensation circuit 20n are turned on. , and the first switch SW1 is not turned on. At this time, the voltage potential of the compensation voltage line VcLn is grounded (that is, 0V), and a small current i charges the compensation capacitor Cc through the driving transistor T and the light emitting unit LU, so that the voltage of the first terminal N1 (Vc_N1) rises to The voltage (Vcomp) of the compensation signal is subtracted from the threshold voltages (Vth_T, Vth_LU) of the driving transistor T and the light emitting unit LU, that is, Vc_N1=Vcomp−Vth_T−Vth_LU.

Referring to "FIG. 4B", when the data lines DL1-DLm input data signals to the pixel P on the nth horizontal line, the second switch SW2 of the compensation circuit 20n is turned on, and the sampling switch SWb and the first switch SW are not turned on, so that Make the energy storage capacitor Cs store the data signal. At this time, the voltage ( Vc_N1 ) of the first terminal N1 still maintains the voltage value of Vcomp-Vth_T-Vth_LU.

Referring to FIG. 4C , before the light-emitting unit LU of the pixel P on the nth horizontal line is activated, the first switch SW1 of the compensation circuit 20n is turned on, and the sampling switch SWb and the second switch SW2 are not turned on. At this time, the energy storage capacitor Cs in the pixel P is connected in series with the compensation capacitor Cc of the external compensation circuit 20n, and the polarity of the compensation capacitor Cc in series is opposite. The voltage value stored in the energy storage capacitor Cs is Vdata (i.e. the voltage of the data signal), and because the compensation capacitor Cc is connected in series with the opposite polarity, the voltage value of the compensation voltage line VcLn is Vth_T+Vth_LU-Vcomp (i.e. the driving transistor T and the threshold voltage of the light emitting unit LU minus the voltage of the compensation signal), the total voltage difference at the node N3 is the sum of the threshold voltages of the drive transistor T and the light emitting unit LU (Vth_T+Vth_LU) minus the voltage of the compensation signal (Vcomp) The voltage (Vdata) of the data signal is added, that is, Vth_T+Vth_LU-Vcomp+Vdata.

Referring to "Fig. 4D", when the light-emitting unit LU of the pixel P on the nth horizontal line is activated, the second switch SW2 of the compensation circuit 20n is turned on, and the sampling switch SWb and the first switch SW1 are not turned on, as shown in Fig. 4C Show. At this time, the driving current I flowing through the light-emitting unit LU is as follows: I=k/2(Vgs-Vth) ² =k/2(Vdata-Vcomp) ² , where k is a constant, and Vgs is the driving transistor T The bias voltage between the gate and the source (that is, the total voltage difference of the compensation voltage line VcLn), and Vth is the threshold voltage sum of the driving transistor T and the light emitting unit LU (Vth_T+Vth_LU). It can be seen from this that the current amount of the light emitting unit LU will not be affected by the threshold voltage of the driving transistor and the light emitting unit.

Referring to FIG. 5 , the reset switch SWr can be connected across the compensation capacitor Cc to reset the compensation capacitor Cc. Taking the nth scan line SLn as an example, when the previous scan line (ie SL(n-1), not shown in the figure) operates, the sampling switch SWs, the first switch SW1 and the reset switch SWr of the compensation circuit 20n conduct is turned on, and the second switch SW2 is not turned on, so as to discharge the charge stored in the compensation capacitor Cc.

Furthermore, when the first switch SW1 is turned on, it can also connect the first end N1 of the compensation capacitor Cc to a certain voltage V. Similarly, when the second switch SW2 is turned on, it can also connect the second end N1 of the compensation capacitor Cc to a certain voltage V. N2 is connected to a certain voltage V, please refer to "Figure 6, 7". The constant voltage V and the voltage source VDD can come from the same or different voltage sources.

Here, the sampling switch SWs, the first switch SW1 and the second switch SW2 can be controlled by the switch controller 30n, please refer to “FIGS. 8A, 8B, 8C, 8D”.

Referring to "Fig. 9", the switch controller 30n can use the scanning signals S(n-1), Sn to generate a plurality of control signals S1(n-2), S1(n-1), S2(n-1), S3 (n-1), S1(n-1), S1n, S2n, S3n. Wherein, the switch controller can use an inverter and/or a shifter to generate multiple control signals according to the types of the reset switch, the sampling switch, the first switch and the second switch in the compensation circuit.

Taking the generation of two control signals for each compensation circuit as an example, referring to "Figure 10A", for the compensation circuit 20n, after the scan signal Sn is input to the switch controller 30, the scan signal Sn is inverted by the inverter 31, so that the output Two control signals S1n, S2n are used to control the sampling switch, the first switch and the second switch in the compensation circuit 20n. Similarly, the control signal S2n can also be generated by the shifter 32 or the combination of the shifter 32 and the inverter 31, please refer to “FIGS. 10B and 10C”.

Moreover, the switch controller 30 can use the buffer 33 to synchronize the output control signals S1n, S2n, please refer to "FIGS. 11A, 11B, 11C".

Taking the generation of three control signals for each compensation circuit as an example, for the compensation circuit 20n, the switch controller 30 can use the scan signal Sn, S(n-1) to pass through the inverter 31 or the shifter 32 or the shifter 32 and The combination of the inverters 31 generates the control signal S2n to output the control signals S1(n−1), S1n, S2n, please refer to “FIGS. 12A, 12B, 12C”.

Moreover, the switch controller 30 can use the buffer 33 to synchronize the output control signals S1(n−1), S1n, S2n, please refer to “FIGS. 13A, 13B, 13C”.

In other words, the switch controller uses the inverter to invert the scan signal, the shifter to shift the phase of the scan signal, and/or buffers the scan signal with a buffer to generate a plurality of control signals to control the operation of the compensation circuit.

Here, the reset switch, the sampling switch, the first switch and the second switch in the compensation circuit may be transistors, such as thin film transistors.

Referring to "FIG. 14A", assuming that the first switch SW1 is a P-channel transistor, and the reset switch SWr, the sampling switch SWs, and the second switch SW2 are N-channel transistors, the compensation circuit 20n needs to use three control signals S1(n- 1), S1n, S2n to control. Here, the waveforms of each signal are shown in "FIG. 14B", where Data is the data signal input from the data lines DL1-DLm, Sn is the scanning signal input from the nth scanning line SLn, and S(n-1) is the Scan signals input by n-1 scan lines (not shown in the figure). Here, the control signal S2n can be obtained by shifting and inversely scanning the signal Sn.

Referring to "FIG. 15A", assuming that the first switch SW1 and the second switch SW2 are P-channel transistors, and the reset switch SWr and the sampling switch SWs are N-channel transistors, the compensation circuit 20n needs to use three control signals S1(n- 1), S1n, S2n to control. Here, the waveforms of each signal are shown in "FIG. 15B", where Data is the data signal input from the data lines DL1-DLm, Sn is the scanning signal input from the nth scanning line SLn, and S(n-1) is the Scan signals input by n-1 scan lines (not shown in the figure). Here, the control signal S2n can be obtained by shifting the scanning signal Sn.

Referring to "Fig. 16A", assuming that the reset switch SWr, the sampling switch SWs, the first switch SW1 and the second switch SW2 are all N-channel transistors, the compensation circuit 20n needs to use four control signals S1(n-1), S1n , S2n, S3n to control. Here, the waveforms of each signal are shown in "FIG. 16B", where Data is the data signal input from the data lines DL1-DLm, Sn is the scanning signal input from the nth scanning line SLn, and S(n-1) is the Scan signals input by n-1 scan lines (not shown in the figure). Here, the control signal S2n can be obtained by shifting the scanning signal Sn, and the control signal S3n can be obtained by inverting the scanning signal Sn.

Referring to "FIG. 17", it shows the driving method of the light emitting diode panel according to the present invention. The light emitting diode panel has a plurality of pixels connected between a plurality of data lines and a plurality of scanning lines. Each pixel includes: a light emitting unit, Drive transistors and bias switches. This driving method includes: using a bias switch to input a compensation signal from the data line to turn on the driving transistor to allow current to flow through the light emitting unit (step 410); Generate a compensation voltage (step 420); use the bias switch to input a data signal from the data line (step 430); adjust the data signal received by the pixels connected to the same scan line according to the compensation voltage (step 440); and use the adjustment The subsequent data signal turns on the driving transistor to drive the light emitting unit (step 450).

Here, the compensation voltage can be generated according to the compensation signal and the threshold voltages of the driving transistors and the light-emitting units of the pixels connected to the same scan line (step 422 ), please refer to FIG. 18 .

And the compensation voltage can be used to adjust the voltage potential of the data signal received by the pixels connected to the same scan line (step 442 ), please refer to “ FIG. 19 ”.

Referring to "FIG. 20", it shows the driving method of the light emitting diode panel according to the present invention. The light emitting diode panel has a plurality of pixels connected between a plurality of data lines and a plurality of scanning lines. Each pixel includes: a light emitting unit, Drive transistors and bias switches. This driving method includes: using a bias switch to input a compensation signal from the data line, so that the driving transistor is turned on and the current is allowed to flow through the light emitting unit (step 510); Threshold voltage, forming a compensation voltage at the first end of an external compensation capacitor (step 520); using a bias switch to input a data signal from the data line (step 530); adjusting and the data signal received by the pixels connected to the scan line (step 540); and the adjusted data signal is used to turn on the driving transistor to drive the light emitting unit (step 550).

Wherein, referring to "FIG. 21", the step of adjusting the data signal includes: grounding the first terminal to form a voltage potential relative to the compensation voltage at the second terminal (step 542); and shifting the voltage potential by forming The data signals received by the pixels connected to the same scan line (step 544).

Here, the compensation voltage can be generated according to the compensation signal and the threshold voltages of the driving transistors and light-emitting units of the pixels connected to the same scan line (step 522 ), please refer to FIG. 22 .

Moreover, this driving method also includes: resetting the external compensation capacitor (step 502), please refer to "FIG. 23". Before driving, discharge the charge stored in the external compensation capacitor.

Although the present invention is disclosed above with the aforementioned preferred embodiments, it is not intended to limit the present invention. Those skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The protection scope of the invention shall be determined by the claims of the present invention.

Claims (37)

1. light-emitting-diode panel includes:

Many data lines, each this data line is imported a compensating signal and a data-signal in order to selectivity;

The multi-strip scanning line, each this sweep trace is in order to input one scan signal;

A plurality of pixels, each this pixel comprises:

One luminescence unit;

One driving transistors is in order to the flow through magnitude of current of this luminescence unit of control; And

One bias switch is in order to according to this data line of this sweep signal conducting correspondence and the control end of this driving transistors;

Many sampling voltage lines connect this pixel corresponding to same this sweep trace, produce a bucking voltage according to the threshold voltage of this compensating signal and this driving transistors and this luminescence unit; And

Many bucking voltage lines corresponding to this sampling voltage line, connect this pixel corresponding to same this sweep trace, to adjust this data-signal according to this bucking voltage.

2. light-emitting-diode panel as claimed in claim 1 also comprises:

A plurality of compensating circuits, each this compensating circuit comprises:

One building-out capacitor has one first end and one second end, and this second end connects this bucking voltage line;

One sampling switch is connected in this first end and between should this sampling voltage line of bucking voltage line;

One first switch, one of be connected in ground connection and the voltage source and this first end between; And

One second switch, one of be connected in ground connection and the voltage source and this second end between.

3. light-emitting-diode panel as claimed in claim 2, wherein when this data line is imported this compensating signal, this sampling switch and this second switch conducting, and this not conducting of first switch.

4. light-emitting-diode panel as claimed in claim 2, wherein when this data line is imported this data-signal, this second switch conducting, and this sampling switch and this not conducting of first switch.

5. light-emitting-diode panel as claimed in claim 2, wherein before this luminescence unit starts, this first switch conduction, and this sampling switch and this not conducting of second switch.

6. light-emitting-diode panel as claimed in claim 2, wherein when this data line is imported this data-signal, this first switch conduction, and this sampling switch and this not conducting of second switch.

7. light-emitting-diode panel as claimed in claim 2, wherein when this luminescence unit starts, this not conducting of second switch, and this sampling switch and this first switch conduction.

8. light-emitting-diode panel as claimed in claim 2, wherein this sampling switch, this first switch and this second switch operate according to this sweep signal.

9. light-emitting-diode panel as claimed in claim 2, wherein this sampling switch connects corresponding this sweep trace.

10 light-emitting-diode panels as claimed in claim 2, wherein this first switch connects corresponding this sweep trace.

11. light-emitting-diode panel as claimed in claim 2, wherein this second switch connects corresponding this sweep trace.

12. light-emitting-diode panel as claimed in claim 2, wherein each this compensating circuit also comprises:

One shifter is in order to the phase place of this sweep signal of displacement.

13. light-emitting-diode panel as claimed in claim 2, wherein each this compensating circuit also comprises:

One phase inverter is in order to reverse with this sweep signal.

14. light-emitting-diode panel as claimed in claim 2, wherein each this compensating circuit also comprises:

One impact damper is in order to cushion this sweep signal.

15. light-emitting-diode panel as claimed in claim 2 also comprises:

One on-off controller is in order to control this sampling switch, this first switch and this second switch.

16. light-emitting-diode panel as claimed in claim 15, wherein this on-off controller connects this sweep trace, controls this sampling switch, this first switch and this second switch with this sweep signal.

17. light-emitting-diode panel as claimed in claim 15, wherein each this compensating circuit also comprises:

One shifter inputs to the phase place of the signal of this compensating circuit in order to displacement.

18. light-emitting-diode panel as claimed in claim 17, the signal that wherein inputs to this compensating circuit is this sweep signal.

19. light-emitting-diode panel as claimed in claim 15, wherein each this compensating circuit also comprises:

One phase inverter will be in order to will input to the signals reverse of this compensating circuit.

20. light-emitting-diode panel as claimed in claim 19, the signal that wherein inputs to this compensating circuit is this sweep signal.

21. light-emitting-diode panel as claimed in claim 15, wherein each this compensating circuit also comprises:

One impact damper inputs to the signal of this compensating circuit in order to buffering.

22. light-emitting-diode panel as claimed in claim 21, the signal that wherein inputs to this compensating circuit is this sweep signal.

23. light-emitting-diode panel as claimed in claim 2, wherein each this compensating circuit also comprises:

One reset switch, cross-over connection is on this building-out capacitor.

24. light-emitting-diode panel as claimed in claim 23, during this sweep trace running of wherein current single order, this sampling switch, this first switch and this reset switch conducting, and this not conducting of second switch are with this building-out capacitor of resetting.

25. light-emitting-diode panel as claimed in claim 23, wherein this reset switch is a transistor.

26. light-emitting-diode panel as claimed in claim 23, this sweep trace of single order before wherein the control end of this reset switch connects.

27. the described light-emitting-diode panel of claim 2, wherein this sampling switch is a transistor.

28. the described light-emitting-diode panel of claim 2, wherein this first switch is a transistor.

29. the described light-emitting-diode panel of claim 2, wherein this second switch is a transistor.

30. light-emitting-diode panel as claimed in claim 1, each this pixel also comprises

One storage capacitor is connected between the control end of this bucking voltage line and this driving transistors.

31. the driving method of a light-emitting-diode panel, this light-emitting-diode panel has a plurality of pixels, be connected between a plurality of data lines and a plurality of sweep trace, each this pixel comprises: a luminescence unit, a driving transistors and a bias switch, and this driving method includes:

Utilize this bias switch to import a compensating signal by this data line so that this driving transistors conducting and allow electric current this luminescence unit of flowing through;

Produce a bucking voltage according to this driving transistors of this pixel of same this sweep trace and the threshold voltage of this luminescence unit;

Utilize this bias switch to import a data-signal by this data line;

This received data-signal of this pixel that is connected with same this sweep trace according to the adjustment of this bucking voltage; And

Utilize adjusted this data-signal to make this driving transistors conducting, to drive this luminescence unit.

32. the driving method of light-emitting-diode panel as claimed in claim 31 wherein is somebody's turn to do the step that produces this bucking voltage, comprising: produce this bucking voltage according to this compensating signal and this threshold voltage.

33. the driving method of light-emitting-diode panel as claimed in claim 31 wherein is somebody's turn to do the step of adjusting this data-signal, comprising: the voltage potential of this data-signal that this pixel of utilizing the adjustment of this bucking voltage to be connected with same this sweep trace is received.

34. the driving method of a light-emitting-diode panel, this light-emitting-diode panel has a plurality of pixels, be connected between a plurality of data lines and a plurality of sweep trace, each this pixel comprises: a luminescence unit, a driving transistors and a bias switch, and this driving method includes:

Utilize this bias switch to import a compensating signal, so that this driving transistors conducting and allow electric current this luminescence unit of flowing through by this data line;

According to this driving transistors of this pixel that connects same this sweep trace and the threshold voltage of this luminescence unit, form a bucking voltage in first end of an external compensation electric capacity;

Utilize this bias switch to import a data-signal by this data line;

This data-signal of this pixel that is connected with same this sweep trace via the second end adjustment of this external compensation electric capacity input according to this bucking voltage; And

Utilize adjusted this data-signal to make this driving transistors conducting, luminous to drive this luminescence unit.

35. the driving method of light-emitting-diode panel as claimed in claim 34 wherein is somebody's turn to do the step of adjusting this data-signal, comprising:

With this first end ground connection, to form the voltage potential of this bucking voltage relatively in this second end; And

This data-signal of this pixel that is connected with same this sweep trace by this voltage potential displacement input.

36. the driving method of light-emitting-diode panel as claimed in claim 34 wherein is somebody's turn to do the step that produces this bucking voltage, comprising: produce this bucking voltage according to this compensating signal and this threshold voltage.

37. the driving method of light-emitting-diode panel as claimed in claim 34 also comprises:

This external compensation electric capacity of resetting.

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