CN110675805A - Pixel circuit, display device and pixel driving method - Google Patents

Abstract

The invention discloses a pixel circuit, comprising: a first sub-circuit, a second sub-circuit and a light-emitting device; the first sub-circuit is used for a scan signal and a reference signal provided by the scan line in a first time period outputting a reset signal to the circuit and performing a compensation action on the circuit, writing a data signal to the pixel unit with the first data signal provided by the first data line, and outputting a corresponding driving current to the light-emitting device during a second time period; the first The two sub-circuits are configured to output a corresponding driving current to the light-emitting device in a first period of time according to the scan signal provided by the scan line and the second data signal provided by the second data line, and output a corresponding driving current to the light-emitting device in a second period of time When the reset signal is output to the circuit, the circuit is compensated, and the data signal is written to the pixel unit; the second end of the light-emitting device is connected to the second power supply end, and is used for emitting light according to the received driving current.

Description

Pixel circuit, display device and pixel driving method

technical field

The present invention relates to the field of liquid crystal display, and in particular, to a pixel circuit, a display device and a pixel driving method.

Background technique

In the process of driving the backplane of the current-type display, a stable current needs to be supplied to the light-emitting device within one frame to maintain a certain brightness, thereby ensuring the controllability of gray scales. In the active current-driven backplane, in order to maintain the state of progressive scanning and avoid the interference of signals between different pixels, the original structure of the pixel driving circuit is 2T1C (that is, 2 TFTs and 1 capacitor), as shown in Figure 1, in Figure 1. In 1, Data is the data signal; Scan is the scanning signal; ELVDD is the DC high level; Vss is the DC low level; T1 and T2 are both TFTs; C is the capacitor; Diode is the light-emitting diode. However, due to the long-term maintenance of the driving TFT T1 in the working state, the device is affected by Stress, resulting in the phenomenon of Vth shift; OLED is currently the main current-driven light-emitting element of the backplane, and at the same time, due to the organic nature of the light-emitting element OLED Therefore, it is easy to be affected by factors such as the environment and the degradation of the material occurs, and the direct impact is the reduction of the luminous efficiency. The above two factors make the 2T1C circuit unable to be used in mass-produced products, and a more complex circuit must be used to compensate for the impact of the above two problems. At present, the more efficient pixel compensation circuit is at least 4T or more. Take the T2C circuit as shown in Figure 2 and Figure 34 as an example, that is, 4 TFTs and 2 capacitors. In Figure 2, Data is the data signal; SCAN1 and SCAN2 are scanning signals; ELVDD is DC high level; T1, T2, T3 and T4 are all TFTs; C, C1 and C2 are capacitors.

All pixel compensation circuits (including the 4T2C structure) are roughly divided into four steps in terms of timing: Reset, Compensation, Data input, and Emission. Each row of pixels includes the above steps. With the continuous improvement of the pixel resolution, the time divided into each step is continuously reduced, which directly affects the compensation effect and luminous efficiency of the pixels.

Because the space required by MicroLED is much smaller than that of OLED under the same luminous efficiency, for the MicroLED pixel compensation circuit, the structure of the original circuit can be modified under the condition of sufficient space to improve the circuit compensation effect and luminous efficiency. .

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides a pixel circuit, a display device and a pixel driving method, which employs two sub-circuits to work alternately to improve circuit compensation effect and luminous efficiency.

The technical scheme provided by the present invention is as follows:

The invention discloses a pixel circuit, comprising: a first sub-circuit, a second sub-circuit and a light-emitting device;

The first sub-circuit is connected to the first end of the light-emitting device, the scan line, the first data line and the first power supply end; the first sub-circuit is used for the scan signal and reference provided by the scan line The signal outputs a reset signal to the circuit during the first period of time and performs a compensation action on the circuit, the first data signal provided by the first data line writes the data signal to the pixel unit, and outputs the corresponding signal to the light-emitting device during the second period of time. the driving current; the second sub-circuit is connected to the first end of the light-emitting device, the scan line, the second data line and the first power supply end; The scan signal and the second data signal provided by the second data line output the corresponding driving current to the light-emitting device during the first time period, and output the reset signal to the circuit during the second time period to compensate the circuit act and write data signals to the pixel unit;

The second end of the light-emitting device is connected to the second power supply end, and is used for emitting light according to the received driving current.

Preferably, the first sub-circuit includes: a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a first capacitor, and a second capacitor;

The control terminal of the first transistor is input with a first driving control signal, the first channel terminal of the first transistor is connected to the first power supply terminal, and the second channel terminal of the first transistor is connected to the first channel terminal of the fourth transistor ;

The control terminal of the second transistor is input with the first data writing control signal, the first channel terminal of the second transistor is connected to the first data line, and the second channel terminal of the second transistor is connected to the control terminal of the fourth transistor;

The control terminal of the third transistor is input with the first reset control signal, the first channel terminal of the third transistor is connected to one end of the first capacitor, and the second channel terminal of the third transistor is connected to the second power supply terminal;

The other end of the first capacitor is connected to the control end of the fourth transistor; the second pass end of the fourth transistor is connected to the first pass end of the sixth transistor;

The control terminal of the fifth transistor is input with the first compensation control signal, the first channel terminal of the fifth transistor is input with the reference signal, and the second channel terminal of the fifth transistor is connected to the control terminal of the fourth transistor;

One end of the second capacitor is connected to the first channel end of the third transistor, and the other end of the second capacitor is connected to the first channel end of the sixth transistor;

The control terminal of the sixth transistor is input with the first light-emitting control signal, and the second channel terminal of the sixth transistor is connected to the light-emitting device;

The second sub-circuit includes: an eleventh transistor, a twelfth transistor, a thirteenth transistor, a fourteenth transistor, a fifteenth transistor, a sixteenth transistor, a third capacitor, and a fourth capacitor;

The control terminal of the eleventh transistor is input with the second driving control signal, the first channel terminal of the eleventh transistor is connected to the first power supply terminal, and the second channel terminal of the eleventh transistor is connected to the power supply terminal of the fourteenth transistor. the first passage end;

The control terminal of the twelfth transistor is input with the second data writing control signal, the first channel terminal of the twelfth transistor is connected to the second data line, and the second channel terminal of the twelfth transistor is connected to the control terminal of the fourteenth transistor;

The control terminal of the thirteenth transistor is input with the second reset control signal, the first channel terminal of the thirteenth transistor is connected to one end of the third capacitor, and the second channel terminal of the thirteenth transistor is connected to the second power supply terminal;

The other end of the third capacitor is connected to the control end of the fourteenth transistor; the second pass end of the fourteenth transistor is connected to the first pass end of the sixteenth transistor;

The control terminal of the fifteenth transistor is input with the second compensation control signal, the first channel terminal of the fifteenth transistor is input with the reference signal, and the second channel terminal of the fifteenth transistor is connected to the control terminal of the fourteenth transistor;

One end of the fourth capacitor is connected to the first channel end of the thirteenth transistor, and the other end of the fourth capacitor is connected to the first channel end of the sixteenth transistor;

The control terminal of the sixteenth transistor is input with the second light-emitting control signal, and the second pass terminal of the sixteenth transistor is connected to the light-emitting device.

Preferably, one of the first time period and the second time period is an odd-numbered frame period, and the other is an even-numbered frame period.

The invention also discloses a display device including the pixel circuit.

The present invention also discloses a pixel driving method, which is applicable to the above-mentioned pixel circuit, including:

Step 1. In the first time period, the first sub-circuit outputs a reset signal to the circuit according to the scan signal provided by the scan line and the first data signal provided by the first data line, performs a compensation action on the circuit, and sends a reset signal to the circuit. The pixel unit writes a data signal; the second sub-circuit outputs a corresponding drive current to the light-emitting device according to the scan signal provided by the scan line and the second data signal provided by the second data line;

Step 2. In the second time period, the first sub-circuit outputs a corresponding driving current to the light-emitting device according to the scan signal provided by the scan line and the first data signal provided by the first data line; the second sub-circuit The circuit outputs a reset signal to the circuit according to the scan signal provided by the scan line and the second data signal provided by the second data line, performs a compensation action on the circuit, and writes a data signal to the pixel unit;

The step 1 and the step 2 are performed alternately.

The invention also discloses a pixel circuit, comprising: a first sub-circuit, a second sub-circuit and a light-emitting device;

The first sub-circuit is connected to the first end of the light-emitting device, the scan line, the first data line and the first power supply end; the first sub-circuit is used for the scan signal provided by the scan line and the The first data signal provided by the first data line outputs a reset signal to the circuit during the first period of time, performs a compensation action on the circuit, and outputs the corresponding driving current to the light-emitting device and writes to the pixel unit during the second period of time. input data signal;

The second sub-circuit is connected to the first end of the light-emitting device, the scan line, the second data line and the first power supply end; the second sub-circuit is used for the scan signal provided by the scan line and the The second data signal provided by the second data line outputs the corresponding drive current to the light-emitting device and writes the data signal to the pixel unit during the first time period, and outputs the reset signal to the circuit and the pixel unit during the second time period. Compensate the circuit;

The second end of the light-emitting device is connected to the second power supply end, and is used for emitting light according to the received driving current.

Preferably, the first sub-circuit includes: a first transistor, a second transistor, a third transistor, a fourth transistor, a sixth transistor, a first capacitor and a second capacitor;

The control terminal of the first transistor is input with a first driving control signal, the first channel terminal of the first transistor is connected to the first power supply terminal, and the second channel terminal of the first transistor is connected to the first channel terminal of the fourth transistor ;

The control terminal of the second transistor is connected to the control terminal of the third transistor and input the first data writing control signal or the first compensation control signal, the first channel terminal of the second transistor is connected to the first data line, the first data The line is used to input the first data signal or the first reset control signal in time division, and the second channel terminal of the second transistor is connected to the control terminal of the fourth transistor;

The first channel end of the third transistor is connected to one end of the first capacitor, and the second channel end of the third transistor is connected to the second power supply end;

The other end of the first capacitor is connected to the control end of the fourth transistor; the second pass end of the fourth transistor is connected to the first pass end of the sixth transistor;

One end of the second capacitor is connected to the first channel end of the third transistor, and the other end of the second capacitor is connected to the first channel end of the sixth transistor;

The control terminal of the sixth transistor is input with the first lighting control signal, and the second channel terminal of the sixth transistor is connected to the second power terminal;

The second sub-circuit includes: an eleventh transistor, a twelfth transistor, a thirteenth transistor, a fourteenth transistor, a sixteenth transistor, a third capacitor, and a fourth capacitor;

The control terminal of the eleventh transistor is input with the second driving control signal, the first channel terminal of the eleventh transistor is connected to the first power supply terminal, and the second channel terminal of the eleventh transistor is connected to the power supply terminal of the fourteenth transistor. the first passage end;

The control terminal of the twelfth transistor is connected to the control terminal of the thirteenth transistor, and the second data write control signal or the second compensation control signal is input, and the first pass terminal of the twelfth transistor is connected to the second data line. The second data line is used for time-division inputting the second data signal or the second reset control signal, and the second channel terminal of the twelfth transistor is connected to the control terminal of the fourteenth transistor;

The first channel end of the thirteenth transistor is connected to one end of the third capacitor, and the second channel end of the thirteenth transistor is connected to the second power supply end;

The other end of the third capacitor is connected to the control end of the fourteenth transistor; the second pass end of the fourteenth transistor is connected to the first pass end of the sixteenth transistor;

One end of the fourth capacitor is connected to the first channel end of the thirteenth transistor, and the other end of the fourth capacitor is connected to the first channel end of the sixteenth transistor;

The control terminal of the sixteenth transistor is input with the second light-emitting control signal, and the second pass terminal of the sixteenth transistor is connected to the second power terminal.

Preferably, one of the first time period and the second time period is an odd-numbered frame period, and the other is an even-numbered frame period.

The present invention also discloses a display device, which is characterized by comprising the pixel circuit according to any one of the above claims 6-8.

The present invention also discloses a pixel driving method, characterized in that the pixel driving method is applicable to the above-mentioned pixel circuit, including:

Step 1. In the first time period, the first sub-circuit outputs a reset signal to the circuit according to the scan signal provided by the scan line and the first data signal provided by the first data line and performs a compensation action on the circuit; The two sub-circuits output the corresponding driving current to the light-emitting device and write the data signal to the pixel unit according to the scan signal provided by the scan line and the second data signal provided by the second data line;

Step 2. In the second time period, the first sub-circuit outputs the corresponding drive current to the light-emitting device and to the pixel unit according to the scan signal provided by the scan line and the first data signal provided by the first data line writing a data signal; the second sub-circuit outputs a reset signal to the circuit according to the scan signal provided by the scan line and the second data signal provided by the second data line, and performs a compensation action on the circuit;

The step 1 and the step 2 are performed alternately.

Compared with the prior art, by modifying the structure of the original 4T2C circuit, the present invention adopts two sub-circuits to work alternately, circuit compensation and luminescence do not occur simultaneously within one frame, and the circuit compensation effect and luminous efficiency are improved.

Description of drawings

The present invention will be further described below by describing preferred embodiments in a clear and easy-to-understand manner with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a prior art pixel driving circuit with a 2T1C architecture;

2 is a schematic diagram of a 4T2C pixel compensation circuit in the prior art;

3 is a schematic diagram of another 4T2C pixel compensation circuit in the prior art;

4 is a schematic diagram of a specific circuit structure of a pixel circuit of the present invention;

5 is a timing diagram of a pixel circuit of the present invention;

6 is a schematic diagram of a specific circuit structure of another pixel circuit of the present invention;

FIG. 7 is a timing diagram of another pixel circuit of the present invention.

Detailed ways

In order to more clearly describe the embodiments of the present invention or the technical solutions in the prior art, the specific embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative efforts, and obtain other implementations.

In order to keep the drawings concise, the drawings only schematically show the parts related to the present invention, and they do not represent its actual structure as a product. In addition, in order to make the drawings concise and easy to understand, in some drawings, only one of the components having the same structure or function is schematically shown, or only one of them is marked. As used herein, "one" not only means "only one", but also "more than one".

FIG. 4 is a schematic circuit diagram of a pixel circuit of the present invention; as shown in FIG. 4 , a pixel circuit includes: a first sub-circuit (represented as A in FIG. 4 ) and a second sub-circuit (represented as B in FIG. 4 ) ) and light-emitting device D;

The first sub-circuit is connected to the first end of the light-emitting device, the scan line (not shown), the first data line and the first power supply end; the first sub-circuit is used to provide the The scan signal and the reference signal Ref output a reset signal to the circuit during the first time period and perform a compensation action on the circuit, the first data signal provided by the first data line writes the data signal to the pixel unit, and during the second time period The corresponding driving current is output to the light-emitting device, wherein the reference signal Ref is provided by the circuit.

The second sub-circuit is connected to the first end of the light-emitting device, the scan line, the second data line and the first power supply end; the second sub-circuit is used for the scan signal provided by the scan line and the The second data signal provided by the second data line outputs the corresponding driving current to the light-emitting device during the first time period, and outputs the reset signal to the circuit during the second time period, performs a compensation action on the circuit, and sends the pixel to the pixel. Cell write data signal.

The second end of the light-emitting device is connected to the second power supply end, and is used for emitting light according to the received driving current.

Wherein, the first power supply terminal is connected to a high level, and the second power supply terminal is connected to a low level; the first data line and the second data line are two adjacent data lines. In this embodiment, the first sub-circuit and the second sub-circuit of the pixel circuit are symmetrical on both sides of the circuit structure. The left and right single-side sub-circuits add a reference signal line on the basis of the original 4T2C, and add 2 TFTs, respectively. Used to control the writing of the reference signal and the driving signal input to the light emitting device. The left side of the circuit is called the first subcircuit and the right side is called the second subcircuit.

Specifically, as shown in FIG. 4 , the first sub-circuit includes: a first transistor T1_A, a second transistor T2_A, a third transistor T3_A, a fourth transistor T4_A, a fifth transistor T5_A, a sixth transistor T6_A, a first capacitor C1_A and the second capacitor C2_A;

The control terminal of the first transistor T1_A is input with the first driving control signal ScanA-1, the first channel terminal of the first transistor T1_A is connected to the first power supply terminal ELVDD, and the second channel terminal of the first transistor T1_A is connected to the first power supply terminal ELVDD. The first pass terminal of the four transistors T4_A;

The control terminal of the second transistor T2_A is input with the first data write control signal ScanA-2, the first channel terminal of the second transistor T2_A is connected to the first data line DataA, and the second channel terminal of the second transistor T2_A is connected to the fourth transistor T4_A Control terminal;

The control terminal of the third transistor T3_A is input with the first reset control signal ScanA-4, the first channel terminal of the third transistor T3_A is connected to one end of the first capacitor C1_A, and the second channel terminal of the third transistor T3_A is connected to the second power supply terminal Vss;

The other end of the first capacitor C1_A is connected to the control end of the fourth transistor T4_A; the second pass end of the fourth transistor T4_A is connected to the first pass end of the sixth transistor T6_A;

The control terminal of the fifth transistor T5_A is input with the first compensation control signal ScanA-3, the first channel terminal of the fifth transistor T5_A is input with the reference signal Ref, and the second channel terminal of the fifth transistor T5_A is connected to the control terminal of the fourth transistor T4_A;

One end of the second capacitor C2_A is connected to the first channel end of the third transistor T3_A, and the other end of the second capacitor C2_A is connected to the first channel end of the sixth transistor T6_A;

The control terminal of the sixth transistor T6_A is input with the first light-emitting control signal ScanA, and the second channel of the sixth transistor T6_A is single-connected to the light-emitting device D.

The scan signals provided by the scan lines of the first sub-circuit include a first drive control signal ScanA-1, a first data writing control signal ScanA-2, a first reset control signal ScanA-4, and a first compensation control signal ScanA- 3 and the first lighting control signal ScanA.

The second sub-circuit includes: an eleventh transistor T1_B, a twelfth transistor T2_B, a thirteenth transistor T3_B, a fourteenth transistor T4_B, a fifteenth transistor T5_B, a sixteenth transistor T6_B, a third capacitor C1_B and a fourth capacitor C2_B;

The control terminal of the eleventh transistor T1_B is input with the second driving control signal ScanB-1, the first channel terminal of the eleventh transistor T1_B is connected to the first power supply terminal ELVDD, and the second channel of the eleventh transistor T1_B The terminal is connected to the first pass terminal of the fourteenth transistor T4_B;

The control terminal of the twelfth transistor T2_B is input with the second data writing control signal ScanB-2, the first channel terminal of the twelfth transistor T2_B is connected to the second data line DataB, and the second channel terminal of the twelfth transistor T2_B is connected to the tenth data line The control terminal of the four transistors T4_B;

The control end of the thirteenth transistor T3_B is input with the second reset control signal ScanB-4, the first pass end of the thirteenth transistor T3_B is connected to one end of the third capacitor C1_B, and the second pass end of the thirteenth transistor T3_B is connected to the second power supply terminal Vss;

The other end of the third capacitor C1_B is connected to the control end of the fourteenth transistor T4_B; the second pass end of the fourteenth transistor T4_B is connected to the first pass end of the sixteenth transistor T6_B;

The control terminal of the fifteenth transistor T5_B is input with the second compensation control signal ScanB-3, the first pass terminal of the fifteenth transistor T5_B is input with the reference signal Ref, and the second pass terminal of the fifteenth transistor T5_B is connected to the fourteenth transistor T4_B the control terminal;

One end of the fourth capacitor C2_B is connected to the first channel end of the thirteenth transistor T3_B, and the other end of the fourth capacitor C2_B is connected to the first channel end of the sixteenth transistor T6_B;

The control terminal of the sixteenth transistor T6_B is input with the second light-emitting control signal ScanB, and the second pass terminal of the sixteenth transistor T6_B is connected to the light-emitting device D.

The scan signals provided by the scan lines of the second sub-circuit include a second drive control signal ScanB-1, a second data writing control signal ScanB-2, a second reset control signal ScanB-4, and a second compensation control signal ScanB- 3 and the second lighting control signal ScanB. In this embodiment, preferably, the duration of a first time period and a second time period are equal, for example, both of them may be 1 frame, 2 frames, multiple frames or any suitable time period. The aging speed of the driving transistors is basically the same. As an optional implementation, one of the first time period and the second time period is an odd-numbered frame time period, and the other is an even-numbered frame time period (the duration of the first time period and the second time period are both a frame).

The operation mechanism of the first sub-circuit will be described below by taking the first sub-circuit as an example.

After the circuit resets Reset, the second transistor T2_A and the sixth transistor T6_A of all pixels are turned off, the first transistor T1_A, the third transistor T3_A, the fourth transistor T4_A, and the fifth transistor T5_A are turned on, and the circuit performs the compensation action; after the compensation is completed The first transistor T1_A, the third transistor T3_A, the fifth transistor T5_A, and the sixth transistor T6_A are turned off, and then the second transistor T2_A is turned on by scanning row by row, and data signals are written in sequence; The three transistors T3_A and the fifth transistor T5_A are turned off, the first transistor T1_A, the fourth transistor T4_A, and the sixth transistor T6_A are turned on, and the light-emitting device enters the emission step.

The four steps of circuit reset, circuit compensation, data input, and emission that need to be completed in one frame are divided into two frames to complete. FIG. 5 is a timing diagram of a pixel circuit of the present invention. As shown in FIG. 5 , the circuit is reset, the circuit is compensated, and the data signal is written into Datainput in one frame (Frame1), and the light-emitting Emission is completed in one frame (Frame2). The first sub-circuit and the second sub-circuit are interleaved to complete different steps. For example, when the first sub-circuit completes the steps of circuit reset Reset, circuit compensation Compensation, and data signal writing into Data input, the second sub-circuit completes the Emission step. The next frame is exchanged, so that the first sub-circuit or the second sub-circuit provides light-emitting current to the light-emitting device in each frame, and the total running time of the four steps becomes twice the original.

The present invention also discloses a display device comprising the above pixel circuit.

The present invention also discloses a pixel driving method, which is applicable to the above-mentioned pixel circuit, including:

Step 1, the first time period (Frame1), the first sub-circuit outputs a reset signal to the circuit according to the scan signal provided by the scan line and the first data signal provided by the first data line to compensate the circuit act and write a data signal to the pixel unit; the second sub-circuit outputs a corresponding driving current to the light-emitting device according to the scan signal provided by the scan line and the second data signal provided by the second data line;

Step 2. In a second time period (Frame2), the first sub-circuit outputs a corresponding driving current to the light-emitting device according to the scan signal provided by the scan line and the first data signal provided by the first data line; The second sub-circuit outputs a reset signal to the circuit according to the scan signal provided by the scan line and the second data signal provided by the second data line, performs a compensation action on the circuit, and writes a data signal to the pixel unit;

The step 1 and the step 2 are performed alternately.

FIG. 6 is a schematic circuit diagram of another pixel circuit of the present invention. As shown in FIG. 6 , another pixel circuit includes: a first sub-circuit (represented as A in FIG. 6 ), a second sub-circuit (represented as B in FIG. 6 ) and a light-emitting device;

The first sub-circuit is connected to the first end of the light-emitting device, the scan line, the first data line and the first power supply end; the first sub-circuit is used for the scan signal provided by the scan line and the The first data signal provided by the first data line outputs a reset signal to the circuit during the first period of time, performs a compensation action on the circuit, and outputs the corresponding driving current to the light-emitting device and writes to the pixel unit during the second period of time. input data signal;

The second sub-circuit is connected to the first end of the light-emitting device, the scan line, the second data line and the first power supply end; the second sub-circuit is used for the scan signal provided by the scan line and the The second data signal provided by the second data line outputs the corresponding drive current to the light-emitting device and writes the data signal to the pixel unit during the first time period, and outputs the reset signal to the circuit and the pixel unit during the second time period. Compensate the circuit;

The second end of the light-emitting device is connected to the second power supply end, and is used for emitting light according to the received driving current.

Specifically, as shown in FIG. 6 , the first sub-circuit includes: a first transistor T1_A, a second transistor T2_A, a third transistor T3_A, a fourth transistor T4_A, a fifth transistor T5_A, a sixth transistor T6_A, a first capacitor C1_A and the second capacitor C2_A;

The control terminal of the first transistor T1_A is input with the first driving control signal ScanA-1, the first channel terminal of the first transistor T1_A is connected to the first power terminal, and the second channel terminal of the first transistor T1_A is connected to the fourth channel terminal. the first pass terminal of the transistor T4_A;

The control terminal of the second transistor T2_A is connected to the control terminal of the third transistor T3_A and input the first data writing control signal ScanA-2 or the first compensation control signal ScanA-3, and the first channel terminal of the second transistor T2_A is connected to the first data writing control signal ScanA-2 or the first compensation control signal ScanA-3. a data line, the first data line is used for time-division inputting the first data signal Data A or the first reset control signal ScanA-4, and the second channel end of the second transistor T2_A is connected to the control end of the fourth transistor T4_A;

The first channel end of the third transistor T3_A is connected to one end of the first capacitor C1_A, and the second channel end of the third transistor T3_A is connected to the second power supply end;

The other end of the first capacitor C1_A is connected to the control end of the fourth transistor T4_A; the second pass end of the fourth transistor T4_A is connected to the first pass end of the sixth transistor T6_A;

One end of the second capacitor C2_A is connected to the first channel end of the third transistor T3_A, and the other end of the second capacitor C2_A is connected to the first channel end of the sixth transistor T6_A;

The control terminal of the sixth transistor T6_A is input with the first light-emitting control signal ScanA, and the second pass terminal of the sixth transistor T6_A is connected to the second power terminal.

The scan signal provided by the scan line of the first sub-circuit includes a first driving control signal ScanA-1, a first data writing control signal ScanA-2 or a first compensation control signal ScanA-3 and a first lighting control signal Scan.

The second sub-circuit includes: an eleventh transistor T1_B, a twelfth transistor T2_B, a thirteenth transistor T3_B, a fourteenth transistor T4_B, a sixteenth transistor T6_B, a third capacitor C1_A and a fourth capacitor C2_A;

The control terminal of the eleventh transistor T1_B is input with the second driving control signal ScanB-1, the first channel terminal of the eleventh transistor T1_B is connected to the first power terminal, and the second channel terminal of the eleventh transistor T1_B connecting the first pass terminal of the fourteenth transistor T4_B;

The control terminal of the twelfth transistor T2_B is connected to the control terminal of the thirteenth transistor T3_B, and the second data writing control signal ScanB-2 or the second compensation control signal ScanB-3 is input, and the first channel of the twelfth transistor T2_B is The terminal is connected to the second data line, the second data line is used to input the second data signal Data B or the second reset control signal ScanB-4 in time division, and the second pass terminal of the twelfth transistor T2_B is connected to the fourteenth transistor T4_B the control terminal;

The first channel end of the thirteenth transistor T3_B is connected to one end of the third capacitor C1_A, and the second channel end of the thirteenth transistor T3_B is connected to the second power supply end;

The other end of the third capacitor C1_A is connected to the control end of the fourteenth transistor T4_B; the second pass end of the fourteenth transistor T4_B is connected to the first pass end of the sixteenth transistor T6_B;

One end of the fourth capacitor C2_B is connected to the first channel end of the thirteenth transistor T3_B, and the other end of the fourth capacitor C2_B is connected to the first channel end of the sixteenth transistor T6_B;

The control terminal of the sixteenth transistor T6_B is input with the second light-emitting control signal ScanB, and the second pass terminal of the sixteenth transistor T6_B is connected to the second power terminal.

The scan signal provided by the scan line of the second sub-circuit includes a second driving control signal ScanB-1, a second data signal Data B or a second reset control signal ScanB-4 and a second light-emitting control signal ScanB.

In this embodiment, preferably, the duration of a first time period and a second time period are equal, for example, both of them may be 1 frame, 2 frames, multiple frames or any suitable time period. The aging speed of the driving transistors is basically the same. As an optional implementation, one of the first time period and the second time period is an odd-numbered frame time period, and the other is an even-numbered frame time period (the duration of the first time period and the second time period are both a frame).

The operation mechanism of the first sub-circuit will be described below by taking the first sub-circuit as an example.

After the circuit resets Reset, the second transistor T2_A and the sixth transistor T6_A of all pixels are turned off, the first transistor T1_A, the third transistor T3_A, the fourth transistor T4_A, and the fifth transistor T5_A are turned on, and the circuit performs the compensation action; after the compensation is completed The first transistor T1_A, the third transistor T3_A, the fifth transistor T5_A, and the sixth transistor T6_A are turned off, and then the second transistor T2_A is turned on by scanning row by row, and data signals are written in sequence; The three transistors T3_A and the fifth transistor T5_A are turned off, the first transistor T1_A, the fourth transistor T4_A, and the sixth transistor T6_A are turned on, and the LED emits light and enters the emission step.

Divide the four steps of circuit reset Reset, circuit compensation Compensation, data signal writing into Data input, and light emission that need to be completed in one frame time into two frames to complete. FIG. 7 is a timing diagram of another pixel circuit of the present invention. . As shown in Figure 7. The circuit reset Reset, the circuit compensation Compensation is completed in one frame, and the data signal writing Data input and emitting Emission are completed in another frame. The first sub-circuit and the second sub-circuit are interleaved to complete different steps. For example, when the first sub-circuit completes the circuit reset and circuit compensation Compensation steps, the second sub-circuit completes the data signal writing Data input and emitting Emission steps. The next frame is exchanged again. The advantage of this allocation is that the reference signal is not separately drawn, and the data line provides the data signal and the reference signal in different time periods (that is, the signal line marked as DataA in FIG. 7 provides the first data signal Data A or the first data signal in time division. A reset control signal ScanA-4, marked as the Data B signal line time-division provides the second data signal Data B or the second reset control signal ScanB-4), the second transistor T2_A and the third transistor T3_A can share the same signal line ( That is, the signal line marked as ScanA-2 in FIG. 7 provides the first data write control signal ScanA-2 or the first compensation control signal ScanA-3 in time division, and the signal line marked as ScanB-2 provides the second data write control in time division. Signal ScanB-2 or second compensation control signal ScanB-3), the circuit scale is reduced, the compensation time is prolonged, and the light-emitting time is shortened, but the total running time of the four steps is still 2 times that before the improvement.

The above two pixel circuits of the present invention are based on the same technical concept, that is, the four steps of circuit reset, circuit compensation and Compensation, data signal writing into Data input, and light emission that need to be completed in one frame are divided into two frames. Completed, you can reset the circuit Reset, the circuit compensation Compensation can be completed in the same frame, the data signal is written to the Data input, and the light emission is completed in another frame, or the circuit reset Reset, the circuit compensation Compensation, and the data signal can be written to the Data input. Completed in the same frame, the light-emitting Emission is completed in a single frame. The first sub-circuit and the second sub-circuit work alternately, so that the luminous efficiency is improved, and the circuit compensation effect is also improved.

It should be noted that the above embodiments can be freely combined as required. The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. It should be regarded as the protection scope of the present invention.

Claims (10)

1. A pixel circuit, comprising: a first sub-circuit, a second sub-circuit and a light emitting device;

the first sub-circuit is connected with a first end of the light-emitting device, a scanning line, a first data line and a first power supply end; the first sub-circuit is used for outputting a reset signal to the circuit and performing compensation action on the circuit according to a scanning signal and a reference signal provided by the scanning line in a first time period, writing a data signal into the pixel unit by a first data signal provided by the first data line, and outputting corresponding driving current to the light-emitting device in a second time period; the second sub-circuit is connected with the first end of the light-emitting device, the scanning line, the second data line and the first power supply end; the second sub-circuit is used for outputting corresponding driving current to the light-emitting device in a first time period according to a scanning signal provided by the scanning line and a second data signal provided by the second data line, and outputting a reset signal to the circuit, performing compensation action on the circuit and writing a data signal into the pixel unit in a second time period;

and the second end of the light-emitting device is connected with the second power supply end and is used for emitting light according to the received driving current.

2. The pixel circuit of claim 1, wherein the first sub-circuit comprises: the transistor comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a first capacitor and a second capacitor;

a control end of the first transistor is used for inputting a first driving control signal, a first path end of the first transistor is connected with a first power supply end, and a second path end of the first transistor is connected with a first path end of the fourth transistor;

a control end of the second transistor inputs a first data writing control signal, a first path end of the second transistor is connected with the first data line, and a second path end of the second transistor is connected with a control end of the fourth transistor;

a control end of the third transistor inputs a first reset control signal, a first path end of the third transistor is connected with one end of the first capacitor, and a second path end of the third transistor is connected with a second power supply end;

the other end of the first capacitor is connected to the control end of the fourth transistor; a second pass terminal of the fourth transistor is connected to a first pass terminal of the sixth transistor;

a control end of the fifth transistor inputs a first compensation control signal, a first path end of the fifth transistor inputs a reference signal, and a second path end of the fifth transistor is connected to a control end of the fourth transistor;

one end of the second capacitor is connected to the first path end of the third transistor, and the other end of the second capacitor is connected to the first path end of the sixth transistor;

a control end of the sixth transistor inputs the first light-emitting control signal, and a second path of the sixth transistor is singly connected to the light-emitting device;

the second sub-circuit comprises: an eleventh transistor, a twelfth transistor, a thirteenth transistor, a fourteenth transistor, a fifteenth transistor, a sixteenth transistor, a third capacitor, and a fourth capacitor;

a control end of the eleventh transistor is used for inputting a second driving control signal, a first path end of the eleventh transistor is connected with a first power supply end, and a second path end of the eleventh transistor is connected with a first path end of the fourteenth transistor;

a control end of the twelfth transistor is used for inputting a second data writing control signal, a first path end of the twelfth transistor is connected with the second data line, and a second path end of the twelfth transistor is connected with a control end of the fourteenth transistor;

a control end of the thirteenth transistor is used for inputting a second reset control signal, a first path end of the thirteenth transistor is connected with one end of the third capacitor, and a second path end of the thirteenth transistor is connected with a second power supply end;

the other end of the third capacitor is connected to the control end of the fourteenth transistor; a second path terminal of the fourteenth transistor is connected to a first path terminal of the sixteenth transistor;

a control end of the fifteenth transistor inputs the second compensation control signal, a first path end of the fifteenth transistor inputs the reference signal, and a second path end of the fifteenth transistor is connected to a control end of the fourteenth transistor;

one end of the fourth capacitor is connected to the first path end of the thirteenth transistor, and the other end of the fourth capacitor is connected to the first path end of the sixteenth transistor;

a control end of the sixteenth transistor inputs the second light emitting control signal, and a second path end of the sixteenth transistor is connected to the light emitting device.

3. The pixel circuit according to claim 1, wherein one of the first period and the second period is an odd frame period and the other is an even frame period.

4. A display device comprising a pixel circuit according to any one of claims 1 to 3.

5. A pixel driving method applied to the pixel circuit according to any one of claims 1 to 3, comprising:

step 1, in a first time period, the first sub-circuit outputs a reset signal to a circuit according to a scanning signal provided by the scanning line and a first data signal provided by the first data line, performs compensation action on the circuit and writes a data signal into a pixel unit; the second sub-circuit outputs corresponding driving current to the light-emitting device according to a scanning signal provided by the scanning line and a second data signal provided by the second data line;

step 2, in a second time period, the first sub-circuit outputs corresponding driving current to the light-emitting device according to the scanning signal provided by the scanning line and the first data signal provided by the first data line; the second sub-circuit outputs a reset signal to the circuit according to a scanning signal provided by the scanning line and a second data signal provided by the second data line, performs compensation action on the circuit and writes a data signal into the pixel unit;

the step 1 and the step 2 are alternately performed.

6. A pixel circuit, comprising: a first sub-circuit, a second sub-circuit and a light emitting device;

the first sub-circuit is connected with a first end of the light-emitting device, a scanning line, a first data line and a first power supply end; the first sub-circuit is used for outputting a reset signal to the circuit according to a scanning signal provided by the scanning line and a first data signal provided by the first data line in a first time period, performing compensation action on the circuit, and outputting a corresponding driving current to the light-emitting device and writing a data signal to the pixel unit in a second time period;

the second sub-circuit is connected with the first end of the light-emitting device, the scanning line, the second data line and the first power supply end; the second sub-circuit is used for outputting corresponding driving current to the light-emitting device and writing data signals to the pixel unit in a first time period according to a scanning signal provided by the scanning line and a second data signal provided by the second data line, and outputting a reset signal to the circuit and performing compensation action on the circuit in a second time period;

and the second end of the light-emitting device is connected with the second power supply end and is used for emitting light according to the received driving current.

7. The pixel circuit according to claim 6, wherein:

the first sub-circuit comprises: the transistor comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a sixth transistor, a first capacitor and a second capacitor;

a control end of the first transistor is used for inputting a first driving control signal, a first path end of the first transistor is connected with a first power supply end, and a second path end of the first transistor is connected with a first path end of the fourth transistor;

the control end of the second transistor is connected with the control end of the third transistor and inputs a first data writing control signal or a first compensation control signal, the first path end of the second transistor is connected with a first data line, the first data line is used for inputting a first data signal or a first reset control signal in a time-sharing mode, and the second path end of the second transistor is connected with the control end of the fourth transistor;

the first pass end of the third transistor is connected with one end of the first capacitor, and the second pass end of the third transistor is connected with a second power supply end;

the other end of the first capacitor is connected to the control end of the fourth transistor; a second pass terminal of the fourth transistor is connected to a first pass terminal of the sixth transistor;

one end of the second capacitor is connected with the first path end of the third transistor, and the other end of the second capacitor is connected with the first path end of the sixth transistor;

a control end of the sixth transistor inputs the first lighting control signal, and a second path end of the sixth transistor is connected with a second power supply end;

the second sub-circuit comprises: an eleventh transistor, a twelfth transistor, a thirteenth transistor, a fourteenth transistor, a sixteenth transistor, a third capacitor, and a fourth capacitor;

a control end of the eleventh transistor is used for inputting a second driving control signal, a first path end of the eleventh transistor is connected with a first power supply end, and a second path end of the eleventh transistor is connected with a first path end of the fourteenth transistor;

a control end of the twelfth transistor is connected with a control end of the thirteenth transistor and inputs a second data writing control signal or a second compensation control signal, a first path end of the twelfth transistor is connected with a second data line, the second data line is used for inputting a second data signal or a second reset control signal in a time-sharing manner, and a second path end of the twelfth transistor is connected with a control end of the fourteenth transistor;

a first path end of the thirteenth transistor is connected with one end of the third capacitor, and a second path end of the thirteenth transistor is connected with the second power supply end;

the other end of the third capacitor is connected to the control end of the fourteenth transistor; a second path terminal of the fourteenth transistor is connected to a first path terminal of the sixteenth transistor;

one end of the fourth capacitor is connected with the first path end of the thirteenth transistor, and the other end of the fourth capacitor is connected with the first path end of the sixteenth transistor;

a control end of the sixteenth transistor is coupled to the second power source end, and a second path end of the sixteenth transistor is coupled to the second light emitting control signal.

8. The pixel circuit according to claim 6, wherein one of the first period and the second period is an odd frame period and the other is an even frame period.

9. A display device comprising a pixel circuit according to any one of claims 6 to 8.

10. A pixel driving method applied to the pixel circuit according to any one of claims 6 to 8, comprising:

step 1, in a first time period, the first sub-circuit outputs a reset signal to a circuit according to a scanning signal provided by the scanning line and a first data signal provided by the first data line and performs compensation action on the circuit; the second sub-circuit outputs corresponding driving current to the light-emitting device and writes data signals to the pixel unit according to a scanning signal provided by the scanning line and a second data signal provided by the second data line;

step 2, in a second time period, the first sub-circuit outputs corresponding driving current to the light-emitting device and writes a data signal to the pixel unit according to a scanning signal provided by the scanning line and a first data signal provided by the first data line; the second sub-circuit outputs a reset signal to the circuit according to the scanning signal provided by the scanning line and the second data signal provided by the second data line and performs compensation action on the circuit;

the step 1 and the step 2 are alternately performed.

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