CN111276099A - Pixel driving circuit and driving method thereof, array substrate and display panel - Google Patents
Pixel driving circuit and driving method thereof, array substrate and display panel Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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Abstract
The invention provides a pixel driving circuit, an array substrate, a display panel and a driving method of the pixel driving circuit, wherein a control end of a first reset switch in the pixel driving circuit is used for receiving a first reset switch control signal, a first end is used for receiving the first reset control signal, and a second end is connected with an anode of a light-emitting device; the first end of the second reset switch is connected with the control end of the compensation and light-emitting control module, and the control end is used for receiving a control signal of the second reset switch; when the second reset switch control signal is effective, a second end of the second reset switch inputs a first voltage, and the second reset switch is conducted; when the second reset switch control signal is invalid, the second reset switch is switched off, and a second voltage is input to a second end of the second reset switch; the second voltage is greater than the first voltage. The invention can effectively reduce the voltage difference between the first end and the second end of the second reset switch under the condition of ensuring that the first reset switch can be reset normally.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a pixel driving circuit, an array substrate, a display panel, and a driving method of a pixel driving circuit.
Background
An OLED (Organic Light Emitting Diode) product needs a Light Emitting device to emit Light, Light Emitting current needed by the Light Emitting device needs to be provided by a driving transistor, and uniformity of characteristics of the driving transistor needs to be improved for uniformity of Light emission of the OLED product, so that compensation for a threshold voltage of the driving transistor is needed.
The prior art compensates the threshold voltage of the driving transistor by a pixel driving circuit that resets the gate potential of the driving transistor by a first reset transistor and resets the anode potential of the light emitting device by a second reset transistor, the source terminals of the first reset transistor and the second reset transistor sharing the same reset signal.
However, the pixel driving circuit in the prior art has the following disadvantages: because the reset signal is a low-level signal, the voltage difference between the source and the drain of the first reset transistor is large, so that the leakage current in the first reset transistor is also large after the first reset transistor is switched off, the current flowing through the driving transistor is increased due to the leakage current, the brightness of the light-emitting device is increased, bright spots occur, and the uniformity of the light emission of the OLED product is poor.
Disclosure of Invention
The invention provides a pixel driving circuit, an array substrate, a display panel and a driving method of the pixel driving circuit, and aims to solve the problem that the uniformity of light emission of an OLED product is poor due to the pixel driving circuit in the prior art.
In order to solve the above problem, an embodiment of the present invention provides a pixel driving circuit applied to an array substrate, where the pixel driving circuit includes a first reset switch, a second reset switch, a compensation and light-emitting control module, and a light-emitting device, where a control end of the first reset switch is configured to receive a first reset switch control signal, a first end of the first reset switch is configured to receive a first reset control signal, and a second end of the first reset switch is connected to an anode of the light-emitting device; the first end of the second reset switch is connected with the control end of the compensation and light-emitting control module, and the control end of the second reset switch is used for receiving a second reset switch control signal; when the second reset switch control signal is an effective signal, a first voltage is input to a second end of the second reset switch, and the second reset switch is switched on; when the second reset switch control signal is an invalid signal, the second reset switch is turned off, and a second voltage is input to a second end of the second reset switch; the second voltage is greater than the first voltage.
In a first aspect, an embodiment of the present invention further provides an array substrate, including: a plurality of pixel units arranged in an array, each of the pixel units including the pixel driving circuit.
In a second aspect, an embodiment of the present invention further provides a display panel, including the array substrate.
In a third aspect, an embodiment of the present invention further provides a driving method of the pixel driving circuit, including a reset phase, a data writing and compensating phase, and a light emitting phase, where in the reset phase, a second reset switch control signal and a first voltage are respectively input to a control terminal and a second terminal of a second reset switch in the pixel driving circuit to turn on the second reset switch; in the data writing and compensating stage, the second reset switch is switched off, a second voltage is input to a second end of the second reset switch, a first reset switch control signal and a first reset control signal are respectively input to a control end and a first end of a first reset switch in the pixel driving circuit so as to enable the first reset switch to be switched on, and data are written through a compensation and light-emitting control module in the pixel driving circuit so as to compensate the control end voltage of the compensation and light-emitting control module; and in the light-emitting stage, the first reset switch is switched off, and the light-emitting device is driven to emit light through the compensation and light-emitting control module.
The embodiment of the invention has the following advantages:
when the second reset switch control signal is an effective signal, a first voltage is input to the second end of the second reset switch, and the second reset switch is conducted, so that the second reset switch can be normally conducted to reset the control end potential of the compensation and light-emitting control module; and setting when the second reset switch control signal is an invalid signal, the second reset switch is turned off, a second voltage is input to a second end of the second reset switch, the second voltage is greater than the first voltage, namely, when the second reset switch is turned off, the voltage of the second end of the second reset switch is raised, the voltage difference between the first end and the second end of the second reset switch is reduced, the leakage current after the second reset switch is turned off is greatly reduced, the abnormal brightness increase condition of the light-emitting device is effectively improved, bright spots are convenient to reduce or eliminate, and the uniformity of light emission of a display panel using the pixel driving circuit is improved.
In addition, the first end of the first reset switch is arranged to receive the first reset control signal, when the second reset switch control signal is an effective signal, a first voltage is input to the second end of the second reset switch, and when the second reset switch control signal is an ineffective signal, a second voltage is input to the second end of the second reset switch, so that a signal (namely, the first reset control signal) corresponding to the first end of the first reset switch and a signal corresponding to the second end of the second reset switch are independently switched on, the first reset switch can still normally reset the anode potential of the light emitting device after the voltage of the second end of the second reset switch is raised to the second voltage, and the contrast of the display panel using the pixel driving circuit is ensured to be within the product standard.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a pixel driving circuit according to the present invention;
FIG. 2 is a timing diagram of an embodiment of a pixel driving circuit according to the invention;
FIG. 3 is a timing diagram of another embodiment of a pixel driving circuit according to the present invention;
FIG. 4 is a schematic diagram of another embodiment of a pixel driving circuit according to the present invention;
fig. 5 is a schematic cross-sectional view of a first reset switch in an array substrate according to an embodiment of the invention;
fig. 6 is a plan layout of a first reset switch in an array substrate according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, which shows a schematic structural diagram of an embodiment of a pixel driving circuit according to the present invention, the pixel driving circuit is applied to an array substrate, and as shown in fig. 1, the pixel driving circuit may include a first RESET switch T1, a second RESET switch T2, a compensation and emission control module 1, and a light emitting device EL, wherein a control terminal of the first RESET switch T1 is configured to receive a first RESET switch control signal RESET (N +1), a first terminal of the first RESET switch T1 is configured to receive a first RESET control signal Init1, a second terminal of the first RESET switch T1 is connected to an anode of the light emitting device EL, and the first RESET switch control signal RESET (N +1) and the first RESET control signal Init1 control the first RESET switch T1 to be turned on, so as to RESET an anode potential of the light emitting device EL; a first end of the second reset switch T2 is connected to the control end of the compensation and light-emitting control module 1, and a control end of the second reset switch T2 is configured to receive a second reset switch control signal reset (n); when the second reset switch control signal reset (n) is an active signal, the second end of the second reset switch T2 inputs the first voltage V1, and the second reset switch control signal reset (n) and the first voltage V1 control the conduction of the second reset switch T2, so as to reset the control terminal potential of the compensation and light-emitting control module 1; when the second reset switch control signal reset (n) is an inactive signal, the second reset switch T2 is turned off, and the second voltage V2 is input to the second terminal of the second reset switch T2; the second voltage V2 is greater than the first voltage V1. The second RESET switch control signal RESET (N) may be a RESET switch control signal corresponding to a current row (nth row) of pixel driving circuits in the array substrate, the first RESET switch control signal RESET (N +1) may be a RESET switch control signal corresponding to a next row (N +1) of pixel driving circuits in the array substrate, and N is an integer greater than or equal to 1.
Specifically, when the second reset switch control signal reset (n) is an active signal, the second terminal of the second reset switch T2 is input with the first voltage V1, and the second reset switch T2 is turned on, so as to ensure that the second reset switch T2 can be turned on normally to reset the control terminal potential of the compensation and light-emitting control module 1; and setting that when the second reset switch control signal reset (n) is an inactive signal, the second reset switch T2 is turned off, the second voltage V2 is input to the second end of the second reset switch T2, the second voltage is greater than the first voltage, that is, when the second reset switch T2 is turned off, the voltage of the second end of the second reset switch T2 is raised, so as to reduce the voltage difference between the first end and the second end of the second reset switch T2, the leakage current after the second reset switch T2 is turned off is greatly reduced, the abnormal increase of the brightness of the light emitting device EL is effectively improved, so as to reduce or eliminate bright spots, and improve the uniformity of light emission of a display panel (such as an OLED panel or an AMOLED (Active-matrix organic light-emitting diode) panel applying the pixel driving circuit). In addition, the first terminal of the first reset switch T1 is configured to receive the first reset control signal Init1, when the second reset switch control signal reset (n) is an active signal, the second terminal of the second reset switch T2 inputs the first voltage V1, and when the second reset switch control signal reset (n) is an inactive signal, the second terminal of the second reset switch T2 inputs the second voltage V2, so that the signal corresponding to the first terminal of the first reset switch T1 (i.e., the first reset control signal Init1) and the signal corresponding to the second terminal of the second reset switch T2 are independently turned on, and it is ensured that the anode potential of the light emitting device can still be normally reset by the first reset switch T1 after the voltage of the second terminal of the second reset switch T2 is raised to the second voltage V2, thereby ensuring that the contrast of the display panel using the pixel driving circuit is within the product standards.
Alternatively, the compensation and lighting control module 1 may have any structure, including but not limited to the structure of the compensation and lighting control module 1 shown in fig. 1. Alternatively, the light emitting device EL may be any light emitting device EL that can be used for a display panel. Alternatively, the first reset switch T1 and the second reset switch T2 may be NTFT (N Thin Film Transistor) transistors, PTFT (P Thin Film Transistor) transistors, or the like.
Alternatively, the voltage corresponding to the first reset control signal Init1 may be any voltage that can reset the anode potential of the light emitting device EL.
Optionally, the array substrate may include a first voltage supply terminal and a second voltage supply terminal, the first voltage supply terminal provides the first voltage V1, and the second voltage supply terminal provides the second voltage V2; as shown in fig. 2, when the second reset switch control signal reset (n) is an active signal, the second terminal of the second reset switch T2 is connected to the first voltage providing terminal, and the second terminal of the second reset switch T2 inputs the first voltage V1; when the second reset switch control signal reset (n) is the inactive signal, the second terminal of the second reset switch T2 is connected to the second voltage providing terminal, and the second terminal of the second reset switch T2 inputs the second voltage V2. In any manner, the second end of the second reset switch T2 may be connected to the first voltage providing end when the second reset switch control signal reset (n) is an active signal, and the second end of the second reset switch T2 may be connected to the second voltage providing end when the second reset switch control signal reset (n) is an inactive signal.
Optionally, the array substrate may include a second reset control signal line for transmitting a second reset control signal Init2, and the second terminal of the second reset switch T2 is connected to the second reset control signal line; as shown in fig. 3, when the second reset switch control signal reset (n) is an active signal, the voltage corresponding to the second reset control signal Init2 is the first voltage V1; when the second reset switch control signal reset (n) is an inactive signal, the voltage corresponding to the second reset control signal Init2 is the second voltage V2.
Alternatively, the second voltage may be smaller than a third voltage, and the third voltage may be a control terminal voltage of the compensation and light emission control module 1 when the compensation and light emission control module 1 is turned on. Alternatively, in one implementation of the invention, the first voltage may be less than or equal to-3V.
Alternatively, in another embodiment of the present invention, as shown in fig. 4, the first terminal of the first RESET switch T1 may be connected to the control terminal, and the first terminal and the control terminal of the first RESET switch T1 are configured to receive the first RESET switch control signal RESET (N +1), so that the first terminal and the control terminal of the first RESET switch T1 may share the first RESET switch control signal RESET (N +1), without additionally providing a signal source of the first RESET control signal Init1, which facilitates reducing the implementation cost of the pixel driving circuit.
Alternatively, as shown in fig. 4, the compensation and lighting control module 1 may include a capacitor C, a driving control switch T3, a first compensation control switch T4, a second compensation control switch T5, a first lighting control switch T6, and a second lighting control switch T7, wherein one end of the capacitor C is connected to the power supply, the other end of the capacitor C is connected to a first end of a second reset switch T2, and the voltage provided by the power supply is VDD; the first end of the first light-emitting control switch T6 is connected with a power supply, and the control end of the first light-emitting control switch T6 is used for receiving a light-emitting switch control signal EM (N); a first end of the first compensation control switch T4 is configured to receive a data signal vdata (n), a second end of the first compensation control switch T4 is connected to a second end of the first lighting control switch T6, and a control end of the first compensation control switch T4 is configured to receive a compensation switch control signal gate (n), wherein a voltage corresponding to the data signal vdata (n) may be greater than or equal to a third voltage; a first end of the driving control switch T3 is connected to a second end of the first light-emitting control switch T6 and a second end of the first compensation control switch T4, respectively, and a control end of the driving control switch T3 is connected to the other end of the capacitor C and a first end of the second reset switch T2, respectively; the control end of the driving control switch T3 is used as the control end of the compensation and light-emitting control module 1; a first end of the second compensation control switch T5 is connected to the control end of the driving control switch T3, a second end of the second compensation control switch T5 is connected to the second end of the driving control switch T3, and the control end of the second compensation control switch T5 is configured to receive a compensation switch control signal gate (n); a first terminal of the second light-emitting control switch T7 is connected to the second terminal of the driving control switch T3, a second terminal of the second light-emitting control switch T7 is connected to the anode of the light-emitting device EL, a control terminal of the second light-emitting control switch T7 is configured to receive a light-emitting switch control signal em (n), and the cathode of the light-emitting device EL is grounded to VSS. In fig. 4, the first reset switch T1, the second reset switch T2, the driving control switch T3, the first compensation control switch T4, the second compensation control switch T5, the first light emission control switch T6, and the second light emission control switch T7 may be PTFT tubes.
The operation process of the pixel driving circuit in fig. 1 and 4 may include a reset phase K1, a data writing and compensating phase K2 and a light emitting phase K3, and the timing sequence of the pixel driving circuit in fig. 1 and 4 may be the timing sequence in fig. 2 or the timing sequence in fig. 3. The reset phase K1, the data writing and compensation phase K2, and the light emitting phase K3 of the pixel driving circuit are described in detail below by taking the pixel driving circuit in fig. 4 and the timing sequence in fig. 3 as examples.
In the reset phase K1, a second reset switch control signal reset (n) of a low level and a first voltage V1 are respectively input to the control terminal and the second terminal of the second reset switch T2 in the pixel driving circuit to turn on the second reset switch T2. At this time, the control terminal potential of the drive control switch T3 is reset to the first voltage. Further, a high-level second reset switch control signal reset (n) is input to the control terminal of the second reset switch T2 in the pixel driving circuit, the second reset switch T2 is turned off, and a second voltage V2 is input to the second terminal of the second reset switch T2, so that the voltage difference between the first terminal and the second terminal of the second reset switch T2 is reduced, and the leakage current after the second reset switch T2 is turned off is greatly reduced. As shown in fig. 3, the input time and duration of the first voltage V1 in the low-level second reset switch control signal reset (n) and the second reset control signal Init2 may be the same, and the input time and duration of the second voltage V2 in the high-level second reset switch control signal reset (n) and the second reset control signal Init2 may be the same.
In a data writing and compensation stage K2, a low-level compensation switch control signal gate (N) is input, the first compensation control switch T4, the second compensation control switch T5 and the drive control switch T3 are switched on, data signals are written, the control end potential of the drive control switch T3 is the potential of the data signals, and the threshold voltage of the drive control switch T3 is compensated; then, the high-level compensation switch control signal gate (n) is input, the first compensation control switch T4 and the second compensation control switch T5 are turned off, and the control terminal potential of the drive control switch T3 is maintained at the potential corresponding to the data signal due to the capacitor C. While the compensation switch control signal gate (N) of a low level is input, a first RESET switch control signal RESET (N +1) of a low level may be input to the control terminal and the first terminal of the first RESET switch T1 in the pixel driving circuit to turn on the first RESET switch T1, so that the anode potential of the light emitting device EL is RESET to a low potential corresponding to the first RESET switch control signal RESET (N + 1); and inputting a first RESET switch control signal RESET (N +1) of a high level to the control terminal and the first terminal of the first RESET switch T1 in the pixel driving circuit to turn off the first RESET switch T1 while inputting the compensation switch control signal gate (N) of a high level.
In the light emission period K3, a low level light emission switch control signal em (n) is input, and the first light emission control switch T6, the second light emission control switch T7, and the drive control switch T3 are turned on, so that the light emitting device EL emits light. In fig. 2 and 3, the waveform of the light emission switch control signal em (n) is not shown.
It should be noted that, the level of the embodiment of the present invention is only schematic, and does not represent the actual voltage value or relative proportion, and the low level signal corresponds to the on signal (active signal) of the P-type transistor, and the high level signal corresponds to the off signal (inactive signal) of the P-type transistor, corresponding to the embodiment of the present invention.
The pixel driving circuit of the embodiment of the invention has the following advantages:
when the second reset switch control signal is an effective signal, a first voltage is input to the second end of the second reset switch, and the second reset switch is conducted, so that the second reset switch can be normally conducted to reset the control end potential of the compensation and light-emitting control module; and setting when the second reset switch control signal is an invalid signal, the second reset switch is turned off, a second voltage is input to a second end of the second reset switch, the second voltage is greater than the first voltage, namely, when the second reset switch is turned off, the voltage of the second end of the second reset switch is raised, the voltage difference between the first end and the second end of the second reset switch is reduced, the leakage current after the second reset switch is turned off is greatly reduced, the abnormal brightness increase condition of the light-emitting device is effectively improved, bright spots are convenient to reduce or eliminate, and the uniformity of light emission of a display panel using the pixel driving circuit is improved.
In addition, the first terminal of the first reset switch is configured to receive the first reset control signal, or the first terminal of the first reset switch is configured to be connected to the control terminal, the first terminal and the control terminal of the first reset switch are configured to receive the first reset switch control signal (the first terminal and the control terminal of the first reset switch share the first reset switch control signal, and the first reset control signal is not required to be additionally configured), and when the second reset switch control signal is an active signal, the second terminal of the second reset switch inputs the first voltage (the first voltage provided by the first voltage providing terminal or the first voltage in the second reset control signal), and when the second reset switch control signal is an inactive signal, the second terminal of the second reset switch inputs the second voltage (the second voltage provided by the second voltage providing terminal or the second voltage in the second reset control signal), so that the signal (i.e., the first reset control signal) corresponding to the first terminal of the first reset switch and the second reset control signal are corresponding to the first terminal of the first reset switch The signal corresponding to the second end of the switch is independently switched on, so that the first reset switch can still normally reset the anode potential of the light-emitting device after the voltage of the second end of the second reset switch is raised to the second voltage, and the contrast of the display panel using the pixel driving circuit is ensured to be within the product standard.
An embodiment of the present invention further provides an array substrate, including: the pixel driving circuit comprises a plurality of pixel units arranged in an array, wherein each pixel unit comprises the pixel driving circuit.
Alternatively, as shown in fig. 5, the array substrate may include a connection layer 511, a source drain layer 512, a gate electrode layer 513, and an active layer 514; the first and second ends of the first reset switch T1 are disposed at the same layer as the active layer 514, and the control end of the first reset switch T1 is disposed at the same layer as the gate electrode layer 513; the connecting layer 511 and the source-drain layer 512 are arranged at the same layer; the first end of the first reset switch T1 is connected to the connection layer 511 through the first via 515, and the control end of the first reset switch T1 is connected to the connection layer 511 through the second via 516, so that the first end and the control end of the first reset switch T1 are connected to each other. When the first reset switch T1 is a PTFT transistor, the first terminal of the first reset switch T1 is a source terminal S, the control terminal of the first reset switch T1 is a gate terminal G, and the second terminal of the first reset switch T1 is a drain terminal D. In fig. 5, 517 is a support layer, 518 is a pixel defining layer, 519 is a planarization layer, 520 is an intermediate layer such as a CNT (Carbon nanotube) intermediate layer, 521 is a gate insulating layer, 522 is a buffer layer, and 523 is a glass substrate layer. Optionally, as shown in fig. 5, the hole walls in the first via 515 and the second via 516 may be covered with a conductive layer, and the conductive material of the conductive layer may be the conductive material for forming the source drain layer 512, so that the processing process of the array substrate may be simplified, and the material cost of the array substrate may be saved. Alternatively, the connection layer 511 in fig. 5 may be constituted by at least one connection wire. If the connection layer 511 is formed by a connection wire, two ends of the connection wire may be connected to the first via 515 and the second via 516, respectively; if the connection layer 511 is formed of a plurality of connection wires, the plurality of connection wires are connected in sequence, and both ends of the wire formed of the plurality of connection wires may be connected to the first via 515 and the second via 516, respectively.
Fig. 6 is a plan layout of a first RESET switch T1 in the array substrate, in fig. 6, 524 is a first signal line corresponding to a second RESET control signal Init2, 525 is a second signal line corresponding to a RESET switch control signal RESET, the first signal line 524 is used for transmitting the second RESET control signal Init2, the second signal line 525 is used for transmitting a first RESET switch control signal RESET (N +1) and a second RESET switch control signal RESET (N), etc., in fig. 6, a first end and a control end of a first RESET switch T1 are connected through a connection layer 511.
The array substrate provided by the embodiment of the invention has the following advantages: when a second reset switch control signal is an effective signal in the pixel driving circuit, a first voltage is input to a second end of a second reset switch, and the second reset switch is conducted to ensure that the second reset switch can be normally conducted to reset the control end potential of the compensation and light-emitting control module; and setting when the second reset switch control signal is an invalid signal, the second reset switch is turned off, a second voltage is input to a second end of the second reset switch, the second voltage is greater than the first voltage, namely, when the second reset switch is turned off, the voltage of the second end of the second reset switch is raised, the voltage difference between the first end and the second end of the second reset switch is reduced, the leakage current after the second reset switch is turned off is greatly reduced, the abnormal brightness increase condition of the light-emitting device is effectively improved, bright spots are convenient to reduce or eliminate, and the uniformity of light emission of a display panel using the pixel driving circuit is improved.
In addition, the first terminal of the first reset switch is configured to receive the first reset control signal, or the first terminal of the first reset switch is configured to be connected to the control terminal, the first terminal and the control terminal of the first reset switch are configured to receive the first reset switch control signal (the first terminal and the control terminal of the first reset switch share the first reset switch control signal, and the first reset control signal is not required to be additionally configured), and when the second reset switch control signal is an active signal, the second terminal of the second reset switch inputs the first voltage (the first voltage provided by the first voltage providing terminal or the first voltage in the second reset control signal), and when the second reset switch control signal is an inactive signal, the second terminal of the second reset switch inputs the second voltage (the second voltage provided by the second voltage providing terminal or the second voltage in the second reset control signal), so that the signal (i.e., the first reset control signal) corresponding to the first terminal of the first reset switch and the second reset control signal are corresponding to the first terminal of the first reset switch The signal corresponding to the second end of the switch is independently switched on, so that the first reset switch can still normally reset the anode potential of the light-emitting device after the voltage of the second end of the second reset switch is raised to the second voltage, and the contrast of the display panel using the pixel driving circuit is ensured to be within the product standard.
The embodiment of the invention also provides a display panel which comprises the array substrate. Specifically, the display panel according to the embodiment of the present invention may be an OLED panel or an AMOLED panel.
The display panel of the embodiment of the invention has the following advantages: when a second reset switch control signal is an effective signal in a pixel driving circuit of the array substrate, a first voltage is input to a second end of a second reset switch, and the second reset switch is conducted to ensure that the second reset switch can be normally conducted to reset the control end potential of the compensation and light-emitting control module; and setting when the second reset switch control signal is an invalid signal, the second reset switch is turned off, a second voltage is input to a second end of the second reset switch, the second voltage is greater than the first voltage, namely, when the second reset switch is turned off, the voltage of the second end of the second reset switch is raised, the voltage difference between the first end and the second end of the second reset switch is reduced, the leakage current after the second reset switch is turned off is greatly reduced, the abnormal brightness increase condition of the light-emitting device is effectively improved, bright spots are convenient to reduce or eliminate, and the uniformity of light emission of a display panel using the pixel driving circuit is improved.
In addition, the first terminal of the first reset switch is configured to receive the first reset control signal, or the first terminal of the first reset switch is configured to be connected to the control terminal, the first terminal and the control terminal of the first reset switch are configured to receive the first reset switch control signal (the first terminal and the control terminal of the first reset switch share the first reset switch control signal, and the first reset control signal is not required to be additionally configured), and when the second reset switch control signal is an active signal, the second terminal of the second reset switch inputs the first voltage (the first voltage provided by the first voltage providing terminal or the first voltage in the second reset control signal), and when the second reset switch control signal is an inactive signal, the second terminal of the second reset switch inputs the second voltage (the second voltage provided by the second voltage providing terminal or the second voltage in the second reset control signal), so that the signal (i.e., the first reset control signal) corresponding to the first terminal of the first reset switch and the second reset control signal are corresponding to the first terminal of the first reset switch The signal corresponding to the second end of the switch is independently switched on, so that the first reset switch can still normally reset the anode potential of the light-emitting device after the voltage of the second end of the second reset switch is raised to the second voltage, and the contrast of the display panel using the pixel driving circuit is ensured to be within the product standard.
The embodiment of the invention also provides a driving method of the pixel driving circuit. The driving method of the pixel driving circuit provided by the embodiment of the invention can comprise three stages, namely a reset stage, a data writing and compensating stage and a light-emitting stage, wherein in the reset stage, a second reset switch control signal and a first voltage are respectively input to a control end and a second end of a second reset switch in the pixel driving circuit so as to enable the second reset switch to be conducted; in the data writing and compensating stage, the second reset switch is switched off, a second voltage is input to the second end of the second reset switch, a first reset switch control signal and a first reset control signal are respectively input to the control end and the first end of the first reset switch in the pixel driving circuit so as to enable the first reset switch to be conducted, and data are written in through the compensation and light-emitting control module in the pixel driving circuit so as to compensate the control end voltage of the compensation and light-emitting control module; and in the light-emitting stage, the first reset switch is switched off, and the light-emitting device is driven to emit light through the compensation and light-emitting control module.
The driving method of the pixel driving circuit according to the embodiment of the present invention can be applied to the pixel driving circuits shown in fig. 1 and 4.
The driving method of the pixel driving circuit provided by the embodiment of the invention has the following advantages: when the second reset switch control signal is an effective signal in the pixel driving circuit, the second end of the second reset switch inputs a first voltage, and the second reset switch is switched on, so that the second reset switch can be normally switched on to reset the control end potential of the compensation and light-emitting control module; and setting when the second reset switch control signal is an invalid signal, the second reset switch is turned off, a second voltage is input to a second end of the second reset switch, the second voltage is greater than the first voltage, namely, when the second reset switch is turned off, the voltage of the second end of the second reset switch is raised, the voltage difference between the first end and the second end of the second reset switch is reduced, the leakage current after the second reset switch is turned off is greatly reduced, the abnormal brightness increase condition of the light-emitting device is effectively improved, bright spots are convenient to reduce or eliminate, and the uniformity of light emission of a display panel using the pixel driving circuit is improved.
In addition, since the first terminal of the first reset switch in the pixel driving circuit is configured to receive the first reset control signal, or since the first terminal of the first reset switch in the pixel driving circuit is connected to the control terminal, the first terminal and the control terminal of the first reset switch are configured to receive the first reset switch control signal (the first terminal and the control terminal of the first reset switch share the first reset switch control signal, and the first reset control signal is not required to be additionally provided), and when the second reset switch control signal is an active signal, the second terminal of the second reset switch inputs the first voltage (the first voltage provided by the first voltage providing terminal or the first voltage in the second reset control signal), and when the second reset switch control signal is an inactive signal, the second terminal of the second reset switch inputs the second voltage (the second voltage provided by the second voltage providing terminal or the second voltage in the second reset control signal), therefore, a signal (namely, a first reset control signal) corresponding to the first end of the first reset switch and a signal corresponding to the second end of the second reset switch are independently switched on, so that the first reset switch can still normally reset the anode potential of the light-emitting device after the voltage of the second end of the second reset switch is raised to the second voltage, and the contrast of the display panel using the pixel driving circuit is ensured to be within the product standard.
For the array substrate and the display panel embodiment, since the array substrate and the display panel embodiment include the pixel driving circuit, the description is relatively simple, and for the relevant points, reference may be made to part of the description of the pixel driving circuit embodiment. For the embodiment of the driving method of the pixel driving circuit, the related points of the pixel driving circuit can be referred to the partial description of the embodiment of the pixel driving circuit.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The above detailed descriptions of the pixel driving circuit, the array substrate, the display panel and the driving method of the pixel driving circuit provided by the present invention are provided, and the principle and the implementation of the present invention are explained by applying specific examples, and the descriptions of the above examples are only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A pixel driving circuit applied to an array substrate is characterized in that the pixel driving circuit comprises a first reset switch, a second reset switch, a compensation and light-emitting control module and a light-emitting device, wherein,
the control end of the first reset switch is used for receiving a first reset switch control signal, the first end of the first reset switch is used for receiving a first reset control signal, and the second end of the first reset switch is connected with the anode of the light-emitting device;
the first end of the second reset switch is connected with the control end of the compensation and light-emitting control module, and the control end of the second reset switch is used for receiving a second reset switch control signal; when the second reset switch control signal is an effective signal, a first voltage is input to a second end of the second reset switch, and the second reset switch is switched on; when the second reset switch control signal is an invalid signal, the second reset switch is turned off, and a second voltage is input to a second end of the second reset switch; the second voltage is greater than the first voltage.
2. The pixel driving circuit according to claim 1, wherein the array substrate comprises a first voltage supply terminal and a second voltage supply terminal, the first voltage supply terminal provides the first voltage, and the second voltage supply terminal provides the second voltage; when the second reset switch control signal is an effective signal, the second end of the second reset switch is connected with the first voltage supply end; and when the second reset switch control signal is an invalid signal, the second end of the second reset switch is connected with the second voltage supply end.
3. The pixel driving circuit according to claim 1, wherein the array substrate comprises a second reset control signal line for transmitting a second reset control signal, and a second terminal of the second reset switch is connected to the second reset control signal line; when the second reset switch control signal is an effective signal, the voltage corresponding to the second reset control signal is the first voltage; and when the second reset switch control signal is an invalid signal, the voltage corresponding to the second reset control signal is the second voltage.
4. The pixel driving circuit according to claim 1, wherein the second voltage is less than a third voltage, and the third voltage is a control terminal voltage of the compensation and emission control module when the compensation and emission control module is turned on.
5. The pixel driving circuit according to claim 1, wherein a first terminal of the first reset switch is connected to a control terminal, and the first terminal and the control terminal of the first reset switch are configured to receive the first reset switch control signal.
6. The pixel driving circuit according to claim 1, wherein the compensation and emission control module comprises a capacitor, a driving control switch, a first compensation control switch, a second compensation control switch, a first emission control switch, and a second emission control switch,
one end of the capacitor is connected with a power supply, and the other end of the capacitor is connected with the first end of the second reset switch;
the first end of the first light-emitting control switch is connected with the power supply, and the control end of the first light-emitting control switch is used for receiving a light-emitting switch control signal;
the first end of the first compensation control switch is used for receiving a data signal, the second end of the first compensation control switch is connected with the second end of the first light-emitting control switch, and the control end of the first compensation control switch is used for receiving a compensation switch control signal;
a first end of the driving control switch is connected with a second end of the first light-emitting control switch and a second end of the first compensation control switch respectively, and a control end of the driving control switch is connected with the other end of the capacitor and a first end of the second reset switch respectively; the control end of the drive control switch is used as the control end of the compensation and light-emitting control module;
a first end of the second compensation control switch is connected with a control end of the drive control switch, a second end of the second compensation control switch is connected with a second end of the drive control switch, and the control end of the second compensation control switch is used for receiving the compensation switch control signal;
the first end of the second light-emitting control switch is connected with the second end of the driving control switch, the second end of the second light-emitting control switch is connected with the anode of the light-emitting device, and the control end of the second light-emitting control switch is used for receiving the light-emitting switch control signal.
7. An array substrate, comprising: a plurality of pixel units arranged in an array, each of the pixel units comprising the pixel driving circuit according to any one of claims 1 to 6.
8. The array substrate according to claim 7, wherein the array substrate comprises a connection layer, a source drain layer, a gate electrode layer and an active layer; the first end and the second end of the first reset switch are arranged on the same layer as the active layer, and the control end of the first reset switch is arranged on the same layer as the gate electrode layer; the connecting layer and the source drain layer are arranged on the same layer; the first end of the first reset switch is connected with the connecting layer through a first via hole, and the control end of the first reset switch is connected with the connecting layer through a second via hole, so that the first end of the first reset switch is connected with the control end.
9. A display panel comprising the array substrate according to any one of claims 7 to 8.
10. A driving method of the pixel drive circuit according to any one of claims 1 to 6, comprising a reset phase, a data writing and compensating phase, and a light emission phase, wherein,
in the reset stage, a second reset switch control signal and a first voltage are respectively input to a control end and a second end of a second reset switch in the pixel driving circuit, so that the second reset switch is conducted;
in the data writing and compensating stage, the second reset switch is switched off, a second voltage is input to a second end of the second reset switch, a first reset switch control signal and a first reset control signal are respectively input to a control end and a first end of a first reset switch in the pixel driving circuit so as to enable the first reset switch to be switched on, and data are written through a compensation and light-emitting control module in the pixel driving circuit so as to compensate the control end voltage of the compensation and light-emitting control module;
and in the light-emitting stage, the first reset switch is switched off, and the light-emitting device is driven to emit light through the compensation and light-emitting control module.
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