Pixel driving circuit and display device

Abstract

The utility model relates to the technical field of display, and discloses a pixel driving circuit and a display device.The pixel driving circuit comprises a driving transistor, a driving control sub-circuit, a plurality of light-emitting control sub-circuits and a plurality of light-emitting devices, and the light-emitting devices are sequentially connected in series; the light emitting control sub-circuits are connected with the positive electrode and the negative electrode of one light emitting device in the light emitting devices in a one-to-one correspondence mode, and the driving control sub-circuit responds to signals of the driving control end, provides data voltage of the data signal end to the control end of the driving transistor and controls the driving transistor to generate driving current. According to the pixel driving circuit, a plurality of light-emitting control sub-circuits are arranged on the substrate and provide driving current for the plurality of light-emitting control sub-circuits, the plurality of light-emitting control sub-circuits respond to signals of a light-emitting control end and provide the driving current for at least one light-emitting device, and the plurality of light-emitting control sub-circuits in the pixel driving circuit share one driving control sub-circuit to achieve the light-emitting scheme of at least one light-emitting device. And the power consumption is effectively reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology and provides a pixel driving circuit and a display device. Background Art

[0002] In the related art, the pixel driving circuit generates a driving current by controlling a driving control part, and sends the driving current to the connected light-emitting device to emit light. A typical display panel includes multiple light-emitting devices, and correspondingly also includes multiple driving control parts. Usually, one or more light-emitting devices are connected to a corresponding driving control part. The above connection method will cause the display panel to consume more power. Utility Model Content

[0003] The embodiments of the present disclosure provide a pixel driving circuit and a display device, which are used to connect multiple light-emitting devices to the same driving control subcircuit, thereby saving power consumption of the circuit.

[0004] The specific technical solutions provided by this disclosure are as follows:

[0005] In a first aspect, an embodiment of the present disclosure provides a pixel driving circuit, comprising: a driving transistor, a driving control subcircuit, a plurality of light-emitting control subcircuits, and a plurality of light-emitting devices, wherein the plurality of light-emitting devices are sequentially connected in series, one end of the light-emitting devices connected in series is connected to the driving control subcircuit through the plurality of light-emitting control subcircuits, the other end of the light-emitting devices connected in series is connected to a first power supply end, and the plurality of light-emitting control subcircuits are respectively connected to a positive electrode and a negative electrode of one of the plurality of light-emitting devices in a one-to-one correspondence;

[0006] The driving control subcircuit is coupled to the second power supply terminal via the driving transistor, and is also coupled to the light emitting control subcircuit, and is configured to respond to a signal from the driving control terminal, provide a data voltage from the data signal terminal to the control terminal of the driving transistor, control the driving transistor to generate a driving current, and provide the driving current to the plurality of light emitting control subcircuits;

[0007] The plurality of light emission control subcircuits are configured to provide a driving current to at least one light emitting device in response to a signal at a light emission control terminal.

[0008] Optionally, the light emitting control subcircuit includes: a first control unit, a second control unit and a third control unit;

[0009] The first control unit is coupled to the control node and is configured to provide control data to the control node in response to a signal of the strobe control terminal;

[0010] The second control unit is coupled to the drive control subcircuit and one end of the light emitting device connected in series, and is configured to connect the drive control subcircuit and the light emitting device in response to a signal of the control node;

[0011] The third control unit is coupled to the positive electrode and the negative electrode of the corresponding light emitting device, and is configured to control the positive electrode and the negative electrode of the light emitting device to be turned on or off in response to a signal of the control node.

[0012] Optionally, the first control unit includes: a first switching transistor;

[0013] The control terminal of the first switch transistor is coupled to the gate control terminal, the first terminal of the first switch transistor is coupled to the control data terminal, and the second terminal of the first switch transistor is coupled to the control node.

[0014] Optionally, the second control unit includes: a second switching transistor;

[0015] The control end of the second switch transistor is coupled to the control node, the first end of the second switch transistor is coupled to the drive control subcircuit, and the second end of the second switch transistor is coupled to one end of the light-emitting device connected in series.

[0016] Optionally, the third control unit includes: a third switching transistor;

[0017] The control end of the third switch transistor is coupled to the control node, the first end of the third switch transistor is coupled to the anode of the corresponding light emitting device, and the second end of the third switch transistor is coupled to the cathode of the corresponding light emitting device.

[0018] Optionally, it further includes: a first capacitor;

[0019] The first terminal of the first capacitor is coupled to the control node, and the second terminal of the first capacitor is coupled to the reference voltage terminal.

[0020] Optionally, the voltage at the reference voltage terminal is a constant voltage.

[0021] Optionally, the voltage at the reference voltage terminal includes a plurality of jump voltages.

[0022] Optionally, the drive control subcircuit includes: a data writing unit, a conduction control unit and a light-emitting conduction unit, wherein the drive control terminal includes a scan signal terminal, a conduction signal terminal and a light-emitting conduction terminal;

[0023] The data writing unit is coupled to the first end of the driving transistor and is configured to input the data voltage of the data signal end into the control end of the driving transistor in response to the signal of the scanning signal end;

[0024] The conduction control unit is coupled to the second terminal of the driving transistor and is configured to conduct the second terminal of the driving transistor with the control terminal of the driving transistor in response to the signal at the conduction signal terminal;

[0025] The light-emitting conduction unit is configured to provide the driving current generated by the driving transistor to at least one light-emitting control sub-circuit in response to a signal at the light-emitting conduction terminal.

[0026] Optionally, the data writing unit includes: a fourth switch transistor;

[0027] The control end of the fourth switch transistor is coupled to the scan signal end, the first end of the fourth switch transistor is coupled to the first end of the drive transistor, and the second end of the fourth switch transistor is coupled to the data signal end.

[0028] Optionally, the conduction control unit includes: a fifth switch transistor;

[0029] The control terminal of the fifth switch transistor is coupled to the conduction signal terminal, the first terminal of the fifth switch transistor is coupled to the control terminal of the driving transistor, and the second terminal of the fifth switch transistor is coupled to the second terminal of the driving transistor.

[0030] Optionally, the light-emitting conduction unit includes: a sixth switch transistor and a seventh switch transistor;

[0031] The control end of the sixth switch transistor is coupled to the light-emitting conduction end, the first end of the sixth switch transistor is coupled to the second power supply end, and the second end of the sixth switch transistor is coupled to the first end of the driving transistor;

[0032] The control end of the seventh switch transistor is coupled to the light-emitting conduction end, the first end of the seventh switch transistor is coupled to the second end of the driving transistor, and the second end of the seventh switch transistor is coupled to the first end of the second switch transistor.

[0033] Optionally, a reset subcircuit is also included;

[0034] The reset sub-circuit is coupled to the control terminal of the driving transistor;

[0035] The reset sub-circuit is configured to provide the signal of the reset signal terminal to the control terminal of the driving transistor in response to the signal of the reset control signal terminal.

[0036] Optionally, the reset subcircuit includes: an eighth switch transistor;

[0037] The control terminal of the eighth switch transistor is coupled to the reset control signal terminal, the first terminal of the eighth switch transistor is coupled to the control terminal of the driving transistor, and the second terminal of the eighth switch transistor is coupled to the reset signal terminal.

[0038] Optionally, it further includes: a second capacitor;

[0039] A first terminal of the second capacitor is coupled to the second power supply terminal, and a second terminal of the second capacitor is coupled to the control terminal of the driving transistor.

[0040] In a second aspect, an embodiment of the present disclosure further provides a display device, comprising any one of the above-mentioned pixel driving circuits.

[0041] The beneficial effects of the present disclosure are as follows:

[0042] In summary, a pixel driving circuit and a display device are provided in an embodiment of the present disclosure. The pixel driving circuit includes: a driving transistor, a driving control subcircuit, a plurality of light-emitting control subcircuits and a plurality of light-emitting devices, wherein the plurality of light-emitting devices are connected in series in sequence, one end of the light-emitting devices connected in series is connected to the driving control subcircuit through the plurality of light-emitting control subcircuits, and the other end of the light-emitting devices connected in series is connected to the first power supply terminal, and the plurality of light-emitting control subcircuits are also respectively connected to the positive electrode and the negative electrode of one of the plurality of light-emitting devices in a one-to-one correspondence, the driving control subcircuit is coupled to the second power supply terminal via the driving transistor, and the driving control subcircuit is also coupled to the light-emitting control subcircuit, and is configured to respond to a signal at the driving control terminal, provide a data voltage at the data signal terminal to the control terminal of the driving transistor, control the driving transistor to generate a driving current, and provide the driving current to the plurality of light-emitting control subcircuits, and the plurality of light-emitting control subcircuits are configured to respond to a signal at the light-emitting control terminal, and provide the driving current to at least one light-emitting device, and the plurality of light-emitting control subcircuits in the above-mentioned pixel driving circuit share a driving control subcircuit to implement a solution of emitting light from at least one light-emitting device, thereby effectively reducing power consumption.

[0043] Other features and advantages of the present disclosure will be described in the following description, and partly become apparent from the description, or be understood by practicing the present disclosure. The purpose and other advantages of the present disclosure can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present disclosure. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure. In the drawings:

[0045] Figure 1 is a connection diagram of a pixel driving circuit in an embodiment of the present disclosure;

[0046] Figure 2 is a circuit connection diagram of a first pixel driving circuit in an embodiment of the present disclosure;

[0047] Figure 3 is a circuit connection diagram of a second pixel driving circuit in an embodiment of the present disclosure;

[0048] Figure 4 is a schematic diagram of multiple jump voltages in an embodiment of the present disclosure;

[0049] Figure 5 is a circuit connection diagram of a third pixel driving circuit in an embodiment of the present disclosure;

[0050] Figure 6 is a circuit connection diagram of another pixel driving circuit in an embodiment of the present disclosure;

[0051] Figure 7 Schematic diagram of a timing sequence of a pixel driving circuit in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the technical solution of the present disclosure, rather than all the embodiments. Based on the embodiments recorded in the present disclosure document, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the technical solution of the present disclosure.

[0053] The terms "first", "second", etc. in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented using sequences other than those illustrated or described here.

[0054] In the related art, the pixel driving circuit generates a driving current by controlling the driving control part, and sends the driving current to the connected light-emitting device to emit light. A typical display panel includes multiple light-emitting devices, and correspondingly also includes multiple driving control parts. Usually, the above one or more light-emitting devices are connected to a corresponding driving control part. The above connection method will cause the display panel to consume more power, especially some mobile devices (such as smart watches, etc.) have high requirements for power consumption, and it is urgent to reduce the power consumption of the above pixel driving circuit.

[0055] The preferred embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0056] See also Figure 1 As shown, a pixel driving circuit proposed in an embodiment of the present application includes: a driving transistor, a driving control subcircuit, multiple light-emitting control subcircuits and multiple light-emitting devices, wherein the multiple light-emitting devices are connected in series in sequence, one end of the series-connected light-emitting devices is connected to the driving control subcircuit through the multiple light-emitting control subcircuits, and the other end of the series-connected light-emitting devices is connected to the first power supply end, and the multiple light-emitting control subcircuits are also respectively connected to the positive electrode and the negative electrode of one of the multiple light-emitting devices in a one-to-one correspondence.

[0057] First, it should be noted that in the embodiment of the present application, a plurality of light-emitting devices located in different rows and columns in the pixel driving circuit share a driving control subcircuit, and the plurality of light-emitting devices are sequentially connected in series to form a light-emitting device string. In the embodiment of the present application, the pixels located in different rows and columns include only one light-emitting device for illustration, and accordingly, the at least one light-emitting device mentioned below is located at different positions in the display panel.

[0058] In addition, unlike the connection mode in which the driving control subcircuit of the pixel driving circuit is connected between the light-emitting device and the first power supply terminal in the related art, in the embodiment of the present application, one end of the light-emitting device connected in series is connected to the driving control subcircuit through multiple light-emitting control subcircuits, and the other end of the light-emitting device connected in series is connected to the first power supply terminal, that is, the driving control subcircuit is connected between the light-emitting device string and the first power supply terminal. It should be supplemented that the first power supply terminal is the power supply terminal VSS.

[0059] The driving control subcircuit is coupled to the second power supply terminal via the driving transistor, and the driving control subcircuit is also coupled to the light-emitting control subcircuit, and is configured to respond to the signal of the driving control terminal, provide the data voltage of the data signal terminal to the control terminal of the driving transistor, control the driving transistor to generate a driving current, and provide the driving current to multiple light-emitting control subcircuits.

[0060] In the embodiment of the present application, the second power supply terminal, the driving transistor and the driving control subcircuit are electrically connected in sequence, the second power supply terminal is Vdd, and the driving control subcircuit is also electrically connected to the light-emitting device via the light-emitting control subcircuit. During implementation, when the signal of the driving control terminal is valid, the driving control subcircuit can provide the data voltage to the control terminal of the driving transistor, thereby controlling the driving transistor to generate a driving current, and further providing the driving current to the light-emitting control subcircuit, so that the light-emitting device corresponding to the light-emitting control subcircuit emits light under the action of the driving current.

[0061] The following is a detailed introduction to the light-emitting control subcircuit in the embodiment of the present application. The multiple light-emitting control subcircuits are configured to provide a driving current to at least one light-emitting device in response to a signal at a light-emitting control terminal.

[0062] During implementation, when the signal of the light emitting control terminal is valid, the light emitting control subcircuit provides driving current to at least one light emitting device located at different positions of the display panel. In the related art, the at least one light emitting device generates driving current respectively through different driving control subcircuits.

[0063] Exemplarily, the light emitting control subcircuit includes: a first control unit, a second control unit and a third control unit.

[0064] Considering that different light-emitting devices generate driving currents by the same driving control subcircuit, in order to enable different light-emitting devices to flexibly realize grayscale display during the display process, in the embodiment of the present application, different control data will be introduced into different light-emitting control subcircuits. In view of the similar implementation of each light-emitting control subcircuit, any one of the light-emitting control subcircuits 201 is described in detail here. For the convenience of description, the light-emitting control subcircuit includes: a first control unit, a second control unit, and a third control unit.

[0065] The first control unit is coupled to the control node and is configured to provide control data to the control node in response to a signal at the strobe control terminal.

[0066] For example, see Figure 2 As shown, the first control unit includes: a first switching transistor.

[0067] See also Figure 2 As shown, the connection relationship between the first switch transistor and other components is: the control end of the first switch transistor is coupled to the selection control end, the first end of the first switch transistor is coupled to the control data end, and the second end of the first switch transistor is coupled to the control node.

[0068] During implementation, when the signal at the selection control terminal is at a low level, the first switch transistor is turned on, and the control data at the control data terminal is provided to the control node A via the turned-on first switch transistor.

[0069] The second control unit is coupled to the driving control subcircuit and one end of the light-emitting device connected in series, and is configured to connect the driving control subcircuit and the light-emitting device in response to a signal of the control node.

[0070] For example, see Figure 2 As shown, the second control unit includes: a second switching transistor.

[0071] See also Figure 2 As shown, the connection relationship between the second switch transistor and other components is: the control end of the second switch transistor is coupled to the control node, the first end of the second switch transistor is coupled to the drive control subcircuit, and the second end of the second switch transistor is coupled to one end of the light-emitting device connected in series.

[0072] During implementation, when the signal of the control node is at a high level, the second switch transistor is turned on, and the driving current of the driving control subcircuit is provided to one end of the light-emitting device connected in series through the turned-on second switch transistor, thereby providing the driving current to the light-emitting device.

[0073] The third control unit is coupled to the positive electrode and the negative electrode of the corresponding light emitting device, and is configured to control the positive electrode and the negative electrode of the light emitting device to be turned on or off in response to a signal of the control node.

[0074] For example, see Figure 2 As shown, the third control unit includes: a third switching transistor.

[0075] See also Figure 2 As shown, the connection relationship between the third switch transistor and other components is: the control end of the third switch transistor is coupled to the control node, the first end of the third switch transistor is coupled to the positive electrode of the corresponding light-emitting device, and the second end of the third switch transistor is coupled to the negative electrode of the corresponding light-emitting device.

[0076] Since the multiple light-emitting devices in the present application are connected in series in sequence, when a driving current is provided to one of the light-emitting devices, the current in the entire light-emitting device string is the driving current, which will cause each light-emitting device to emit light. Obviously, this does not comply with the display rules of the display panel.

[0077] In order to enable each light-emitting control subcircuit to accurately control a light-emitting device, the light-emitting control subcircuit further includes a third switch transistor, which is used to electrically connect the positive and negative electrodes of a corresponding light-emitting device in the light-emitting device string. It should be noted that the corresponding light-emitting device is usually a light-emitting device that another light-emitting control subcircuit directly provides a driving current to, that is, the corresponding light-emitting device is not a light-emitting device directly controlled by the first transistor and the second transistor. The setting of the third switch transistor effectively suppresses the influence of the driving current on other light-emitting devices in the series circuit.

[0078] Based on this, the polarity of the first switch transistor and the second switch transistor is opposite. The first switch transistor is a P-type transistor, and the second switch transistor is an N-type transistor; or the first switch transistor is an N-type transistor, and the second switch transistor is a P-type transistor. Here, the first switch transistor is a P-type transistor and the second switch transistor is an N-type transistor for illustration. Figure 2 shown.

[0079] During implementation, when the signal of the control node is at a low level, the third switch transistor is turned on, and the turned-on third switch transistor short-circuits the corresponding light-emitting device, thereby inhibiting the corresponding light-emitting device from emitting light.

[0080] In addition, the above-mentioned light emitting control subcircuit also includes: a first capacitor.

[0081] The first terminal of the first capacitor is coupled to the control node, and the second terminal of the first capacitor is coupled to the reference voltage terminal.

[0082] During implementation, the setting of the first capacitor can maintain the control data of the control node.

[0083] See also Figure 2 As shown, in one embodiment, the voltage at the reference voltage terminal is a constant voltage.

[0084] During the implementation process, when the voltage at the above-mentioned reference voltage terminal is a constant voltage, the grayscale value displayed by the light-emitting device corresponding to the light-emitting control subcircuit is based on the grayscale corresponding to the above-mentioned driving current, and the light-emitting duration of the above-mentioned light-emitting device is controlled by the above-mentioned control data, that is, the grayscale value displayed by the light-emitting device is the result of the combined effect of the above-mentioned driving current and the light-emitting duration.

[0085] See also Figure 3 As shown, in another embodiment, the voltage at the reference voltage terminal includes a plurality of jump voltages.

[0086] During the implementation process, when the voltage at the above-mentioned reference voltage terminal is a jump voltage, the grayscale value displayed by the light-emitting device corresponding to the light-emitting control subcircuit is based on the grayscale corresponding to the above-mentioned driving current, and the above-mentioned control data and multiple jump voltages are used to comprehensively control the light-emitting duration of the above-mentioned light-emitting device, that is, the grayscale value displayed by the light-emitting device is the result of the combined action of the above-mentioned driving current, light-emitting duration and multiple jump voltages.

[0087] The following example uses multiple jump voltages as continuous step voltages. Assume that Figure 4 As shown, the above-mentioned multiple jump voltages Sweep(n) have a total of 2 jump voltages, and the control data before the jump is a negative value (the corresponding twelfth switch transistor is turned off and the thirteenth switch transistor is turned on). After the multiple jump voltages Sweep(n) jump for the first time, the potential of the control node becomes the control data +ΔV, and Sweep(n) becomes the control data +2ΔV after the second jump.

[0088] Case 1: When the value of the written control data is VGL, Sweep(n) increases the voltage by ΔV after the first jump, so that VGL+ΔV is greater than the turn-on voltage of the twelfth switch transistor. The twelfth switch transistor will emit light during the first jump duration Ex1 and the second jump duration Ex2.

[0089] Case 2: If the value of the written control data is 2VGL, then Sweep(n) increases the voltage by ΔV after the first jump, so that 2VGL+ΔV is less than the turn-on voltage of the twelfth switch transistor, and the twelfth switch transistor will not emit light during the first jump duration Ex1; Sweep(n) increases the voltage by ΔV again after the second jump, and the voltage of the control node is 2VGL+ΔV, which is greater than the turn-on voltage of the twelfth switch transistor, and the light-emitting device emits light during the second jump duration Ex2.

[0090] Case 3: The value of the written control data is 3VGL. After Sweep(n) jumps twice, the voltage is 3VGL+2ΔV. The twelfth switch transistor cannot be turned on, and the light-emitting device does not emit light.

[0091] Combination Figure 4 As shown, the on-times of multiple jump voltages Sweep(n) of a subframe are all different. Therefore, by adjusting the driving current and the on-time of the light-emitting device, the control of different grayscale values ​​of the light-emitting device can be achieved. When a data frame includes three subframes, the light-emitting device has 3*3*3=27 light-emitting durations, which are combined with the driving current to achieve full grayscale display; when a data frame includes four subframes, the light-emitting device has 3*3*3*3=81 light-emitting durations, which are combined with the driving current to achieve full grayscale display.

[0092] It should be noted that the above description is based on one light emitting control sub-circuit in the pixel driving circuit. In fact, in the embodiment of the present application, the number of light emitting control sub-circuits included in the pixel driving circuit is at least two.

[0093] See also Figure 2 and Figure 3 As shown, the pixel driving circuit includes a light emitting control subcircuit 201 and a light emitting control subcircuit 202 . Accordingly, the light emitting device includes a light emitting device LED1 controlled by the light emitting control subcircuit 201 , and the light emitting device also includes a light emitting device LED2 controlled by the light emitting control subcircuit 202 .

[0094] See also Figure 5 As shown, the pixel driving circuit includes a light-emitting control subcircuit 201, a light-emitting control subcircuit 202 and a light-emitting control subcircuit 203. Accordingly, the light-emitting device includes a light-emitting device LED1 controlled by the light-emitting control subcircuit 201, the light-emitting device also includes a light-emitting device LED2 controlled by the light-emitting control subcircuit 202, and the light-emitting device also includes a light-emitting device LED3 controlled by the light-emitting control subcircuit 203.

[0095] After introducing the light-emitting control subcircuit, the drive control subcircuit is introduced in detail.

[0096] For example, see Figure 2 As shown, the drive control subcircuit includes: a data writing unit, a conduction control unit and a light-emitting conduction unit, wherein the drive control terminal includes a scan signal terminal, a conduction signal terminal and a light-emitting conduction terminal.

[0097] In an embodiment of the present application, the driving control subcircuit realizes the purpose of providing the data voltage to the control end of the driving transistor and controlling the driving transistor to generate a driving current through a data writing unit and a conduction control unit. The driving control subcircuit provides the driving current to multiple light-emitting control subcircuits through a light-emitting conduction unit.

[0098] The data writing unit is coupled to the first end of the driving transistor and is configured to input the data voltage of the data signal end to the control end of the driving transistor in response to the signal of the scanning signal end.

[0099] For example, see Figure 2 As shown, the data writing unit includes: a fourth switch transistor.

[0100] See also Figure 2 As shown, the connection relationship between the fourth switch transistor and other components is: the control end of the fourth switch transistor is coupled to the scan signal end, the first end of the fourth switch transistor is coupled to the first end of the drive transistor, and the second end of the fourth switch transistor is coupled to the data signal end.

[0101] During implementation, when the signal at the scan signal end is at a low level, the fourth switch transistor is turned on, and the data voltage at the data signal end is provided to the first end of the driving transistor via the turned-on fourth switch transistor.

[0102] The conduction control unit is coupled to the second end of the driving transistor and is configured to conduct the second end of the driving transistor with the control end of the driving transistor in response to a signal at the conduction signal end.

[0103] For example, see Figure 2 As shown, the above-mentioned conduction control unit includes: a fifth switch transistor.

[0104] See also Figure 2 As shown, the connection relationship between the fifth switch transistor and other components is: the control end of the fifth switch transistor is coupled to the conduction signal end, the first end of the fifth switch transistor is coupled to the control end of the driving transistor, and the second end of the fifth switch transistor is coupled to the second end of the driving transistor.

[0105] During implementation, when the signal at the conduction signal terminal is at a high level, the fifth switch transistor is turned on, and the data voltage at the first terminal of the driving transistor is further provided to the control terminal of the driving transistor via the turned-on fifth switch transistor.

[0106] The light-emitting conduction unit is configured to provide the driving current generated by the driving transistor to at least one light-emitting control sub-circuit in response to a signal at the light-emitting conduction terminal.

[0107] For example, see Figure 2As shown, the above-mentioned light-emitting conduction unit includes: a sixth switch transistor and a seventh switch transistor.

[0108] See also Figure 2 As shown, the connection relationship between the sixth switch transistor and other components is: the control end of the sixth switch transistor is coupled to the light-emitting conduction end, the first end of the sixth switch transistor is coupled to the second power supply end, and the second end of the sixth switch transistor is coupled to the first end of the driving transistor.

[0109] During implementation, when the signal at the light-emitting conduction terminal is at a low level, the sixth switch transistor is turned on, and the second power supply terminal is connected to the first terminal of the driving transistor via the turned-on sixth switch transistor.

[0110] See also Figure 2 As shown, the connection relationship between the seventh switch transistor and other components is: the control end of the seventh switch transistor is coupled to the light-emitting conduction end, the first end of the seventh switch transistor is coupled to the second end of the driving transistor, and the second end of the seventh switch transistor is coupled to the first end of the second switch transistor.

[0111] During implementation, when the signal at the light-emitting conduction end is at a low level, the seventh switch transistor is turned on, and the second end of the driving transistor is connected to the first end of the second switch transistor in the light-emitting control subcircuit via the turned-on seventh switch transistor.

[0112] In addition, see Figure 2 As shown, the above pixel driving circuit also includes a reset subcircuit. The reset subcircuit is coupled to the control terminal of the driving transistor.

[0113] The reset sub-circuit is configured to provide the signal of the reset signal terminal to the control terminal of the driving transistor in response to the signal of the reset control signal terminal.

[0114] During implementation, when the signal at the reset control signal terminal is valid, the reset sub-circuit provides the signal at the reset signal terminal to the control terminal of the driving transistor, thereby resetting the level of the control terminal of the driving transistor.

[0115] For example, see Figure 2 As shown, the reset sub-circuit includes: an eighth switch transistor.

[0116] See also Figure 2 As shown, the connection relationship between the eighth switch transistor and other components is: the control end of the eighth switch transistor is coupled to the reset control signal end, the first end of the eighth switch transistor is coupled to the control end of the driving transistor, and the second end of the eighth switch transistor is coupled to the reset signal end.

[0117] During implementation, when the signal at the reset control signal terminal is at a high level, the eighth switch transistor is turned on, and the signal at the reset signal terminal is provided to the control terminal of the driving transistor via the turned-on eighth switch transistor, thereby resetting the level of the control terminal of the driving transistor.

[0118] For example, see Figure 2 As shown, the above pixel driving circuit also includes: a second capacitor.

[0119] See also Figure 2 As shown, the connection relationship between the second capacitor and other components is: the first end of the second capacitor is coupled to the second power supply end, and the second end of the second capacitor is coupled to the control end of the driving transistor.

[0120] The second capacitor in the embodiment of the present application is provided to maintain the data voltage written into the control terminal of the driving transistor, thereby prompting the driving transistor to generate a driving current according to the data voltage in the next stage.

[0121] In addition, see Figure 6 As shown, a deformation circuit of a driving control subcircuit is also proposed in an embodiment of the present application. The deformation circuit is mainly used to provide the data voltage of the data signal end to the control end of the driving transistor, control the driving transistor to generate a driving current, and provide the driving current to multiple light-emitting control subcircuits.

[0122] For example, see Figure 6 As shown, when the signal of the reset terminal Reset(n) is valid, the power terminal Vss resets the level of the light emitting device through the transistor M2 and the light emitting control sub-circuit, and the power terminal Vss resets the control terminal of the driving transistor through the transistor M5 and the transistor M1. When the signal of the scanning terminal Gate-N(n-1) is valid, the data voltage value data is provided to the transistor DT through the transistor M3 and the capacitor c2, so that the transistor DT generates a driving current, and then when the signal of the light emitting terminal EM is valid, the driving current is provided to the light emitting control sub-circuit. The structure and working principle of the light emitting control sub-circuit are the same as those of the above-mentioned light emitting control sub-circuits 201 and 202, etc., and will not be repeated here.

[0123] Combine the following Figure 2 and Figure 7 The working process of the pixel driving circuit in the embodiment of the present application is described in detail.

[0124] Timing t1 stage: reset control signal terminal Gate_N(n-1) = 1, conduction signal terminal Gate_N(n) = 0, selection control terminal Gate1_P(n) = 1, scanning control terminal Gate2_P(n) = 1, light emitting control terminal EM(n) = 1

[0125] When the reset control signal terminal Gate_N(n-1) is at a high level, the eighth switch transistor is turned on, and the signal at the reset signal terminal is provided to the control terminal of the driving transistor via the turned-on eighth switch transistor, thereby resetting the level of the control terminal of the driving transistor.

[0126] Timing t2 stage: reset control signal terminal Gate_N(n-1) = 0, conduction signal terminal Gate_N(n) = 1, selection control terminal Gate1_P(n) = 0, scanning control terminal Gate2_P(n) = 0, light emission control terminal EM(n) = 1

[0127] When the signal of the selection control terminal Gate1_P(n) is at a low level, the first switch transistor is turned on, and the control data of the control data terminal is written into the control node A through the turned-on first switch transistor. At the same time, when the signal of the scan control terminal Gate2_P(n) is at a low level, the fourth switch transistor is turned on, and the data voltage of the data signal terminal is provided to the first terminal of the driving transistor through the turned-on fourth switch transistor, and when the signal of the conduction signal terminal Gate_N(n) is at a high level, the fifth switch transistor is turned on, and the data voltage written into the first terminal of the driving transistor is provided to the control terminal of the driving transistor through the turned-on fifth switch transistor.

[0128] Timing t3 stage: reset control signal terminal Gate_N(n-1) = 0, conduction signal terminal Gate_N(n) = 0, strobe control terminal Gate1_P(n) = 1, scan control terminal Gate2_P(n) = 1, light control terminal EM(n) = 0, Sweep(n) = control data + ΔV

[0129] When the signal of the light-emitting control terminal EM(n) is at a low level, the sixth switch transistor and the seventh switch transistor are both turned on, and the second power supply terminal is connected to the light-emitting control subcircuit via the light-emitting conduction unit and the driving transistor, that is, the driving current generated by the driving transistor is provided to the light-emitting control subcircuit. At the same time, the high level of the control node A turns on the second switch transistor, and the light-emitting device LED1 emits light under the action of the driving current. The high level of the control node A turns on the third switch transistor, and the light-emitting duration of the light-emitting device is determined by the control data +ΔV.

[0130] Timing t4 stage: reset control signal terminal Gate_N(n-1) = 0, conduction signal terminal Gate_N(n) = 0, strobe control terminal Gate1_P(n) = 1, scan control terminal Gate2_P(n) = 1, light control terminal EM(n) = 0, Sweep(n) = control data + 2ΔV

[0131] When the signal of the light-emitting control terminal EM(n) is at a low level, the sixth switch transistor and the seventh switch transistor are both turned on, and the second power supply terminal is connected to the light-emitting control subcircuit via the light-emitting conduction unit and the driving transistor, that is, the driving current generated by the driving transistor is provided to the light-emitting control subcircuit. At the same time, the high level of the control node A turns on the second switch transistor, and the light-emitting device LED1 emits light under the action of the driving current. The high level of the control node A turns on the third switch transistor, and the light-emitting duration of the light-emitting device is determined by the control data +2ΔV.

[0132] Based on the same utility model concept, an embodiment of the present disclosure provides a display device, comprising any one of the above-mentioned pixel driving circuits.

[0133] In the embodiment of the utility model, the display device can be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, etc. Other essential components of the display device should be understood by ordinary technicians in the field, and will not be described here, nor should they be used as limitations of the utility model.

[0134] In summary, in an embodiment of the present disclosure, a pixel driving circuit and a display device are provided, wherein the pixel driving circuit includes: a driving transistor, a driving control subcircuit, a plurality of light-emitting control subcircuits and a plurality of light-emitting devices, wherein the plurality of light-emitting devices are connected in series in sequence, one end of the light-emitting devices connected in series is connected to the driving control subcircuit through the plurality of light-emitting control subcircuits, and the other end of the light-emitting devices connected in series is connected to the first power supply terminal, and the plurality of light-emitting control subcircuits are also respectively connected to the positive electrode and the negative electrode of one of the plurality of light-emitting devices in a one-to-one correspondence, the driving control subcircuit is coupled to the second power supply terminal via the driving transistor, and the driving control subcircuit is also coupled to the light-emitting control subcircuit, and is configured to respond to a signal at the driving control terminal, provide a data voltage at the data signal terminal to the control terminal of the driving transistor, control the driving transistor to generate a driving current, and provide the driving current to the plurality of light-emitting control subcircuits, and the plurality of light-emitting control subcircuits are configured to respond to a signal at the light-emitting control terminal, and provide the driving current to at least one light-emitting device, and the plurality of light-emitting control subcircuits in the above-mentioned pixel driving circuit share one driving control subcircuit to implement a scheme of emitting light from at least one light-emitting device, thereby effectively reducing power consumption.

[0135] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer program product systems. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present disclosure may take the form of a computer program product system implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0136] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program product systems according to the present disclosure. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0137] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0138] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0139] Obviously, those skilled in the art can make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is also intended to include these modifications and variations.

Claims

1. A pixel driving circuit, characterized in that: include: A driving transistor, a driving control subcircuit, a plurality of light-emitting control subcircuits and a plurality of light-emitting devices, wherein the plurality of light-emitting devices are sequentially connected in series, one end of the light-emitting devices connected in series is connected to the driving control subcircuit through the plurality of light-emitting control subcircuits, the other end of the light-emitting devices connected in series is connected to a first power supply end, and the plurality of light-emitting control subcircuits are respectively connected to the positive electrode and the negative electrode of one of the plurality of light-emitting devices in a one-to-one correspondence; The driving control subcircuit is coupled to the second power supply terminal via the driving transistor, and is also coupled to the light emitting control subcircuit, and is configured to respond to a signal from the driving control terminal, provide a data voltage from the data signal terminal to the control terminal of the driving transistor, control the driving transistor to generate a driving current, and provide the driving current to the plurality of light emitting control subcircuits; The plurality of light emitting control subcircuits are configured to provide the driving current to at least one of the light emitting devices in response to a signal at a light emitting control terminal.

2. The circuit according to claim 1, characterized in that The light emitting control subcircuit comprises: a first control unit, a second control unit and a third control unit; The first control unit is coupled to the control node and is configured to provide control data to the control node in response to a signal of the strobe control terminal; The second control unit is coupled to the drive control subcircuit and one end of the light emitting device connected in series, and is configured to connect the drive control subcircuit and the light emitting device in response to a signal of the control node; The third control unit is coupled to the positive electrode and the negative electrode of the corresponding light emitting device, and is configured to control the positive electrode and the negative electrode of the light emitting device to be turned on or off in response to the signal of the control node.

3. The circuit according to claim 2, characterized in that The first control unit includes: a first switching transistor; The control terminal of the first switch transistor is coupled to the selection control terminal, the first terminal of the first switch transistor is coupled to the control data terminal, and the second terminal of the first switch transistor is coupled to the control node.

4. The circuit according to claim 2, characterized in that The second control unit includes: a second switching transistor; The control end of the second switch transistor is coupled to the control node, the first end of the second switch transistor is coupled to the drive control subcircuit, and the second end of the second switch transistor is coupled to one end of the light-emitting devices connected in series.

5. The circuit according to claim 2, characterized in that The third control unit comprises: a third switch transistor; The control end of the third switch transistor is coupled to the control node, the first end of the third switch transistor is coupled to the anode of the corresponding light emitting device, and the second end of the third switch transistor is coupled to the cathode of the corresponding light emitting device.

6. The circuit according to claim 2, characterized in that Also includes: a first capacitor; A first terminal of the first capacitor is coupled to the control node, and a second terminal of the first capacitor is coupled to a reference voltage terminal.

7. The circuit according to claim 6, characterized in that The voltage at the reference voltage terminal is a constant voltage.

8. The circuit according to claim 6, characterized in that The voltage of the reference voltage terminal includes a plurality of jump voltages.

9. The circuit according to any one of claims 1 to 7, characterized in that: The drive control subcircuit comprises: a data writing unit, a conduction control unit and a light-emitting conduction unit, wherein the drive control terminal comprises a scan signal terminal, a conduction signal terminal and a light-emitting conduction terminal; The data writing unit is coupled to the first terminal of the driving transistor and is configured to input the data voltage of the data signal terminal into the control terminal of the driving transistor in response to the signal of the scanning signal terminal; The conduction control unit is coupled to the second terminal of the driving transistor and is configured to conduct the second terminal of the driving transistor with the control terminal of the driving transistor in response to a signal at the conduction signal terminal; The light-emitting conduction unit is configured to provide the driving current generated by the driving transistor to at least one of the light-emitting control sub-circuits in response to a signal at the light-emitting conduction terminal.

10. The circuit according to claim 9, characterized in that The data writing unit comprises: a fourth switch transistor; The control end of the fourth switch transistor is coupled to the scan signal end, the first end of the fourth switch transistor is coupled to the first end of the drive transistor, and the second end of the fourth switch transistor is coupled to the data signal end.

11. The circuit according to claim 9, characterized in that The conduction control unit comprises: a fifth switch transistor; The control terminal of the fifth switch transistor is coupled to the conduction signal terminal, the first terminal of the fifth switch transistor is coupled to the control terminal of the driving transistor, and the second terminal of the fifth switch transistor is coupled to the second terminal of the driving transistor.

12. The circuit according to claim 9, characterized in that The light-emitting conduction unit includes: a sixth switch transistor and a seventh switch transistor; The control end of the sixth switch transistor is coupled to the light-emitting conduction end, the first end of the sixth switch transistor is coupled to the second power supply end, and the second end of the sixth switch transistor is coupled to the first end of the driving transistor; The control end of the seventh switch transistor is coupled to the light-emitting conduction end, the first end of the seventh switch transistor is coupled to the second end of the driving transistor, and the second end of the seventh switch transistor is coupled to the first end of the second switch transistor.

13. The circuit according to claim 9, characterized in that Also includes a reset subcircuit; The reset subcircuit is coupled to the control terminal of the driving transistor; The reset sub-circuit is configured to provide a signal from a reset signal terminal to a control terminal of the driving transistor in response to a signal from a reset control signal terminal.

14. The circuit according to claim 13, characterized in that The reset subcircuit comprises: an eighth switch transistor; The control terminal of the eighth switch transistor is coupled to the reset control signal terminal, the first terminal of the eighth switch transistor is coupled to the control terminal of the driving transistor, and the second terminal of the eighth switch transistor is coupled to the reset signal terminal.

15. The circuit according to claim 1, characterized in that Also includes: A second capacitor; A first terminal of the second capacitor is coupled to the second power supply terminal, and a second terminal of the second capacitor is coupled to the control terminal of the driving transistor.

16. A display device, characterized in that: include: A pixel driving circuit as claimed in any one of claims 1 to 15.

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