CN109545147A - Display panel, pixel circuit and its driving method - Google Patents
Display panel, pixel circuit and its driving method Download PDFInfo
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- CN109545147A CN109545147A CN201811537145.XA CN201811537145A CN109545147A CN 109545147 A CN109545147 A CN 109545147A CN 201811537145 A CN201811537145 A CN 201811537145A CN 109545147 A CN109545147 A CN 109545147A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000001514 detection method Methods 0.000 claims description 93
- 239000003990 capacitor Substances 0.000 claims description 77
- 239000000758 substrate Substances 0.000 claims description 9
- 230000000694 effects Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 10
- 229920001621 AMOLED Polymers 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 2
- 241001270131 Agaricus moelleri Species 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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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
- G09G3/3258—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 with pixel circuitry controlling the voltage across the light-emitting element
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- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
This application discloses a kind of display panel, pixel circuit and its driving methods, wherein pixel circuit includes driving chip and several pixel circuit units connecting with driving chip and several circuit for detecting units, when the second switch in circuit for detecting unit is in the conductive state and the pixel circuit unit of coupled connection in first switch tube be also on state when, driving chip detects the current potential of the anode of electroluminescent cell in the corresponding pixel circuit unit of first switch tube of on state；Wherein, several circuit for detecting units are divided into multiple groups, include at least two circuit for detecting units in every group, are connected between each circuit for detecting unit by connection terminal in every group, and be correspondingly connected with the same pin of driving chip by connection terminal.The application can detect convenient for the anode potential of high pixel density display panel, and the display effect of display panel can be improved, and improve detecting efficiency.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a pixel circuit and a driving method thereof.
Background
An AMOLED (Active-matrix organic light-emitting diode) display screen is widely used in a mobile phone and a television due to advantages of a wide viewing angle and low power consumption.
However, over time, the efficiency of an OLED (organic light-emitting diode) also degrades rapidly, which leads to a gradual decrease in screen brightness. The display effect is influenced, and the service life of the display panel is influenced.
Disclosure of Invention
The application mainly solves the problem of providing a display panel, a pixel circuit and a driving method thereof, which can improve the display effect of the display panel and prolong the service life of the display panel.
In order to solve the technical problem, the present application adopts a technical scheme that: the pixel circuit comprises a driving chip, a plurality of pixel circuit units and a plurality of detection circuit units, wherein the pixel circuit units and the detection circuit units are connected with the driving chip, each detection circuit unit respectively and independently corresponds to a group of pixel circuit units arranged along a first direction and is selectively coupled and connected with each pixel circuit unit in the group of pixel circuit units, and the first direction is the row direction or the column direction of the pixel circuit units arranged in an array; each pixel circuit unit at least comprises a first switch tube and an electroluminescent element, wherein one passage end of the first switch tube is electrically connected with the anode of the electroluminescent element, and the control end of the first switch tube is connected with a scanning signal end; each detection circuit unit at least comprises a selection circuit, the selection circuit at least comprises a second switch tube, a first path end of the second switch tube is connected with the anode of the electroluminescent element in the second switch tube through the corresponding pixel circuit unit, a control end of the second switch tube is connected with a first time sequence signal end, and a second path end of the second switch tube is connected with the driving chip; when the second switch tube in the detection circuit unit is in a conducting state and the first switch tube in the pixel circuit unit coupled with the second switch tube is also in a conducting state, the driving chip detects the potential of the anode of the electroluminescent element in the pixel circuit unit corresponding to the first switch tube in the conducting state; the plurality of detection circuit units are divided into a plurality of groups, each group comprises at least two detection circuit units, and the detection circuit units in each group are connected through connecting terminals and correspondingly connected with the same pin of the driving chip through the connecting terminals; the electroluminescent elements in the pixel circuit units in the same row, which are correspondingly connected with the detection circuits in each group, have the same luminous color.
In order to solve the above technical problem, another technical solution adopted by the present application is: there is provided a driving method of the pixel circuit, the driving method including: detecting the electric potential of the anode of the electroluminescent element in each pixel circuit unit, and recording the electric potential of the anode of the electroluminescent element in the driving chip to form an anode voltage compensation signal; each pixel circuit unit at least comprises a first switching tube and an electroluminescent element; each detection circuit unit at least comprises a selection circuit, and the selection circuit at least comprises a second switch tube; the step of detecting the potential of the anode of the electroluminescent element in each pixel circuit unit comprises: inputting a first timing signal to control the conduction of a second switch tube in the detection circuit unit, and inputting a scanning signal to control the conduction of a first switch tube in the corresponding pixel circuit unit so as to enable the drive chip to be conducted with the anode of the electroluminescent element in the corresponding pixel circuit unit, and further obtain the potential of the anode of the electroluminescent element; the driving chip calls the anode voltage compensation signal and outputs the anode voltage compensation signal to the corresponding pixel circuit unit; the pixel circuit comprises a plurality of pixel circuit units, wherein the pixel circuit units are divided into a plurality of groups, each group comprises at least two detection circuit units, the detection circuit units in each group are connected through connecting terminals and correspondingly connected with the same pin of the driving chip through the connecting terminals, and in the step of inputting a first time sequence signal to control the conduction of a second switch tube in the detection circuit units, the second switch tubes in the detection circuit units in the same group are controlled to be respectively and independently conducted, so that the potentials of the anodes of the electroluminescent elements in the corresponding pixel circuit units are respectively obtained in different time periods.
In order to solve the above technical problem, the present application adopts another technical solution: a display panel is provided, which comprises a substrate and a pixel circuit arranged on the substrate, wherein the pixel circuit is the pixel circuit.
The pixel circuit comprises a driving chip, a plurality of pixel circuit units and a plurality of detection circuit units, wherein the pixel circuit units and the detection circuit units are connected with the driving chip, and the detection circuit units are used for conducting the driving chip and anodes of electroluminescent elements in the corresponding pixel circuit units. Therefore, the driving chip can conveniently acquire the anode potential of the electroluminescent element, the subsequent display stage can conveniently compensate the anode potential, the circuit can be better fused with the pixel circuit unit, the circuit structure is simple, the detection stage and the display stage are designed independently, the detection stage can not influence the display stage, the pixel circuit units of at least two electroluminescent elements with the same color (through the corresponding detection circuit units) are correspondingly connected with the same pin of the driving chip, the pins on the driving chip can be saved, and the hardware resource is saved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
fig. 1 is a schematic circuit diagram of a pixel circuit according to a first embodiment of the present application;
fig. 2 is a schematic circuit diagram of a pixel circuit according to a second embodiment of the present application;
FIG. 3 is a schematic diagram of a dual gate switch tube structure according to an embodiment of the present application;
fig. 4 is a schematic flowchart of an embodiment of a driving method of a pixel circuit according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram illustrating a detailed flow of a display phase according to an embodiment of a driving method of a pixel circuit of the present application;
fig. 6 is a schematic structural diagram of a display panel according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a circuit structure diagram of a pixel circuit according to a first embodiment of the present application.
In the present embodiment, the pixel circuit includes a driving chip 10, and a plurality of pixel circuit units 20 and a plurality of detecting circuit units 30 connected to the driving chip 10.
Each of the detecting circuit units 30 corresponds to a group of pixel circuit units 20 arranged along a first direction, and is selectively coupled to each of the pixel circuit units 20 in the group of pixel circuit units 20, wherein the first direction is a row direction or a column direction of the pixel circuit units 20 arranged in an array.
For example, the first direction may be a column direction of the pixel circuit units arranged in an array. Fig. 1 is a schematic diagram, which only illustrates a connection relationship between one pixel circuit unit 20 and the detection circuit unit 30 in a row of the plurality of pixel circuit units 20, and it is understood that the connection relationships between the other pixel circuit units 20 in the row and the detection circuit unit 30 are the same, and are not individually shown in the figure.
The detection circuit units in each group are connected through connecting terminals and correspondingly connected with the same pin of the driving chip through the connecting terminals; the electroluminescent elements in the pixel circuit units in the same row, which are correspondingly connected with the detection circuits in each group, have the same luminous color. In this embodiment, the plurality of detection circuit units may be arranged along a second direction, which is different from the first direction, and is a row direction or a column direction of the pixel circuit units 20 arranged in an array. For example, as shown in fig. 1, the second direction is a row direction of the pixel circuit units 20 arranged in an array. Of course, in other embodiments, the number of the detection circuit units 30 in each group is not limited to two, and may be three, four, or even more.
Each pixel circuit unit 20 at least includes a first switch transistor T1 and an electroluminescent device D, a pass end of the first switch transistor T1 is electrically connected to an anode of the electroluminescent device D, and a control end of the first switch transistor T1 is connected to a scan signal (scan) end.
Each of the detecting circuit units 30 at least includes a selecting circuit 31, the selecting circuit 31 at least includes a second switch tube T2, a first path terminal of the second switch tube T2 is connected to an anode of the electroluminescent device D in the corresponding pixel circuit unit 20 (referred to as the corresponding pixel circuit unit), a control terminal of the second switch tube T2 is connected to the first timing signal (S1) terminal, and a second path terminal (serving as a connecting terminal) of the second switch tube T2 is connected to (a corresponding pin of) the driving chip 10. The corresponding pixel circuit unit is a pixel circuit unit in a conducting state with the detection circuit unit 30.
When the second switch tube T2 in the detection circuit unit 30 is in the conducting state and the first switch tube T1 in the pixel circuit unit 20 coupled thereto is also in the conducting state, the driving chip 10 detects the potential of the anode of the electroluminescent device D in the pixel circuit unit 20 corresponding to the first switch tube T1 in the conducting state.
Alternatively, the first switching tubes T1 in the pixel circuit units 20 arranged along the second direction are connected to the same scan signal terminal, i.e., share the same scan signal scan. Optionally, each of the detecting circuit units 30 further includes a reset circuit 32, the reset circuit 32 at least includes a third switch tube T3, a first path terminal of the third switch tube T3 is connected to the anode of the electroluminescent device D in the corresponding pixel circuit unit 20 (referred to as the corresponding pixel circuit unit), a control terminal of the third switch tube T3 is connected to the second timing signal S2, and a second path terminal of the third switch tube T3 is connected to a reset signal (reset) terminal.
Referring to fig. 2, fig. 2 is a circuit structure diagram of a pixel circuit according to a second embodiment of the present application.
In the present embodiment, each pixel circuit unit 20 further includes a storage capacitor C and a current control driving transistor (T5) coupled to the anode of the electroluminescent device D, wherein one end of the storage capacitor C is selectively coupled to the driving chip 10, and the other end of the storage capacitor C is selectively coupled to the control terminal of the current control driving transistor (T5), for receiving and storing the anode voltage compensation signal from the driving chip 10, and controlling the current control driving transistor (T5) according to the anode voltage compensation signal.
The first path terminal of the third switch transistor T3 in each detection circuit unit 30 is selectively coupled to the storage capacitor C for performing a selective reset process on the storage capacitor C. The storage capacitor C is reset, so that the storage precision of the storage capacitor C to the anode voltage compensation signal is improved.
Optionally, the selection circuit of each of the detection circuit units further includes a tenth switch T10, a first path of the tenth switch T10 is coupled to one end of the storage capacitor C, a second path of the tenth switch T10 is connected to the connection terminal and the driving chip 10, and a control terminal of the tenth switch T10 is connected to the fifth timing signal terminal (S5).
Optionally, the pixel circuit unit 20 further includes a fourth switching tube T4, a fifth driving tube T5, a sixth switching tube T6, a seventh switching tube T7, an eighth switching tube T8, and a ninth switching tube T9, wherein the fifth driving tube T5 is a current control driving tube.
A first path end of the fourth switching tube T4 is connected to the first working voltage VDD and a first end of the storage capacitor C, and the first end of the storage capacitor C is also connected to the first working Voltage (VDD) end, a second path end of the fourth switching tube T4 is connected to the first path end of the fifth driving tube T5 and the second path end of the ninth switching tube T9, and the first path end of the fifth driving tube T5 is also connected to the second path end of the ninth switching tube T9, and a control end of the fourth switching tube T4 is connected to the enable signal (EM) end.
The second path end of the fifth driving tube T5 is connected to the first path end of the sixth switching tube T6 and the second path end of the seventh switching tube T7, and the first path end of the sixth switching tube T6 is also connected to the second path end of the seventh switching tube T7; the control end of the fifth driving tube T5 is connected with the second end of the storage capacitor C.
The second path terminal of the sixth switching tube T6 is connected to the second path terminal of the first switching tube T1 and the anode of the electroluminescent device D, and the control terminal of the sixth switching tube T6 is connected to the enable signal (EM) terminal.
The first path terminal of the seventh switch tube T7 is connected to the control terminal of the fifth driving tube T5 and the second terminal of the storage capacitor, and the control terminal of the seventh switch tube T7 is connected to the third timing signal (S3) terminal.
A first path terminal of the eighth switch tube T8 is connected to the second terminal of the storage capacitor C, a second path terminal of the eighth switch tube T8 is connected to the first path terminal of the first switch tube T1, the first path terminal of the second switch tube T2 and the first path terminal of the third switch tube T3, and a control terminal of the eighth switch tube T8 is connected to the fourth timing signal (S4) terminal.
The first path end of the ninth switch tube T9 is connected to the first path end of the fifth switch tube T5, the second path end of the ninth switch tube T9 is connected to the first path end of the tenth switch tube T10, the second path end of the tenth switch tube T10 is connected to the aforementioned connection terminal and to (the corresponding pin of) the driving chip 10, the control end of the ninth switch tube T9 is connected to the third timing signal (S3) end, and the control end of the tenth switch tube T10 is connected to the fifth timing signal (S5) end.
The first end of the storage capacitor C is connected to the first operating Voltage (VDD) terminal, the cathode of the electroluminescent device D is connected to the second operating Voltage (VSS) terminal, the first path terminal of the second switching transistor T2 is connected to the first path terminal of the first switching transistor T1 and the second path terminal of the eighth switching transistor T8, and the first path terminal of the third switching transistor T3 is connected to the first path terminal of the first switching transistor T1 and the second path terminal of the eighth switching transistor T8.
Alternatively, the first switching tubes T1 in the pixel circuit units 20 arranged along the second direction share the same scanning signal (scan) terminal; the first switching tubes T1 in the pixel circuit units 20 arranged along the first direction are independently connected with corresponding scanning signals; in the detection stage and the display stage, each pixel circuit unit 20 in the pixel circuit is scanned line by line along the first direction.
Alternatively, the third switch tubes T3 in the detection circuit unit 30 share the same second timing signal S2 and the same reset signal reset corresponding to the pixel circuit units 20 arranged along the second direction.
Alternatively, the control terminal of the second switch tube T2 in the detection circuit unit 30 is connected to different first timing signals S1(R), S1(G) or S1(B) according to the emitting color of the electroluminescent element D in the corresponding pixel circuit unit 20 corresponding to the pixel circuit units 20 arranged along the second direction.
Optionally, corresponding to the pixel circuit units 20 arranged along the second direction, the second path end of the second switch T2 in each sensing circuit unit 30 located in the same group is connected to the same input/output pin of the driving chip 10, and the second path ends of the second switch T2 in the sensing circuit units 30 located in different groups are respectively and independently connected to different input/output pins Out (1), Out (2) or Out (3) of the driving chip 10.
For example, as shown in fig. 1, the first direction is a column direction, the second direction is a row direction, and the first switching tubes T1 in the pixel circuit units 20 in the same row share the same scan signal scan; the first switching tubes T1 in each pixel circuit unit 20 in the same column are independently connected to the corresponding scan signals, i.e. do not receive the scan signals at the same time; in the detection stage and the display stage, each pixel circuit unit 20 in the pixel circuit is scanned row by row along the row direction. For each pixel circuit unit 20 in the same column, the third switch tubes T3 in the detection circuit unit 30 share the same second timing signal S2 and the same reset signal reset. For each pixel circuit unit 20 in the same column, the control terminal of the second switch tube T2 in the detection circuit unit 30 is connected to different first timing signals S1(R), S1(G) or S1(B) according to the emitting color of the electroluminescent element D in the corresponding pixel circuit unit 20. For each pixel circuit unit 20 in the same column, the second path end of the second switch T2 in each detection circuit unit 30 located in the same group is connected to the same input/output pin (e.g., any one of Out (1), Out (2), and Out (3) … …) of the driving chip 10, and the second path ends of the second switch T2 in the detection circuit units 30 located in different groups are independently connected to different input/output pins Out (1) (corresponding to red (R) electroluminescent element in the figure), Out (2) (corresponding to green (G) electroluminescent element in the figure), or Out (3) (corresponding to blue (B) electroluminescent element in the figure) of the driving chip 10.
Specifically, each pixel circuit unit 20 corresponds to one sub-pixel unit of the display panel, for example, three sub-pixel units from left to right in fig. 2 are a red sub-pixel unit (R), a green sub-pixel unit (G), and a blue sub-pixel unit (B), respectively. The adjacent red, green and blue sub-pixel units (RGB) form a pixel unit, and different display colors of the pixel unit are realized by color mixing of the red, green and blue sub-pixel units (RGB) by controlling different gray scales of the sub-pixel units.
Referring to fig. 3, fig. 3 is a schematic diagram of a dual gate switch tube structure according to an embodiment of the present application. Optionally, the seventh switch tube T7 and the eighth switch tube T8 are both dual-gate switch tube structures, each dual-gate switch tube structure includes a first sub-switch tube T01 and a second sub-switch tube T02, gates of the first sub-switch tube T01 and the second sub-switch tube T02 are connected together to serve as a control end of the dual-gate switch tube structure, a first pass end of the first sub-switch tube T01 serves as a first pass end of the dual-gate switch tube structure, a second pass end of the second sub-switch tube T02 serves as a second pass end of the dual-gate switch tube structure, and the second pass end of the first sub-switch tube T01 is connected to the first pass end of the second sub-switch tube T02.
By the above manner, the leakage current of the seventh switch tube T7 and the eighth switch tube T8 can be reduced, the power loss is reduced, and the display effect of the electroluminescent device D is improved. Of course, in other embodiments, MOS transistors with a single gate may be used for the seventh switching transistor T7 and the eighth switching transistor T8, which is not limited in this application.
Optionally, the first switch tube T1, the second switch tube T2, the third switch tube T3, the fourth switch tube T4, the fifth drive tube T5, the sixth switch tube T6, the seventh switch tube T7, the eighth switch tube T8, and the ninth switch tube T9 may be MOS tubes, specifically, thin film transistors, and the first path end and the second path end are turned on when the control end is switched in a low potential, and the first path end and the second path end are turned off when the control end is switched in a high potential. In other embodiments, the configuration may be reversed, for example, when the control terminal is switched on to a low potential, the first and second pass terminals are turned off, and when the control terminal is switched on to a high potential, the first and second pass terminals are turned on. For example, the P-type MOS transistor is turned on when the control terminal is connected to a low potential signal, and turned off when the control terminal is connected to a high potential signal; the N-type MOS tube is switched on by high potential at the control end and is switched off when being switched on by low potential.
Optionally, one of the first and second path ends of the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth switching tubes T1, T2, T3, T4, T5, T6, T7, T8, and T9 is a source, the other is a drain, and the control ends of the first, second, third, and ninth switching tubes T1, T2 are gates.
Alternatively, the electroluminescent element may be an OLED light emitting element, and specifically may be an AMOLED (Active-matrix organic light-emitting diode). In other embodiments, other electroluminescent elements may also be used, which is not limited in the embodiments of the present application.
Referring to fig. 4, fig. 4 is a flowchart illustrating an embodiment of a driving method of a pixel circuit according to an embodiment of the present disclosure.
In this embodiment, the driving method of the pixel circuit may include:
step S11: a detection stage: the potential of the anode of the electroluminescent element in each pixel circuit unit is detected, and the potential of the anode of the electroluminescent element is recorded in the driving chip to form an anode voltage compensation signal.
Wherein, each pixel circuit unit 20 at least includes a first switch transistor T1 and an electroluminescent element D; each detection circuit unit 30 at least comprises a selection circuit 31, the selection circuit at least comprises a second switch tube T2; the step of detecting the potential of the anode of the electroluminescent device D in each pixel circuit unit 20 may specifically include: the input of the first timing signal S1 controls the first and second path terminals of the second switch tube T2 in the detection circuit unit 30 to be conducted, and the input of the scan signal scan controls the first and second path terminals of the first switch tube T1 to be conducted, so that the driving chip 10 is conducted with the anode of the electroluminescent device D in the corresponding pixel circuit unit 20, and the potential of the anode of the electroluminescent device D is obtained.
The plurality of detecting circuit units 30 in the pixel circuit are divided into a plurality of groups, each group includes at least two detecting circuit units 30, each detecting circuit unit 30 in each group is connected through a connection terminal, and is correspondingly connected to the same pin of the driving chip through the connection terminal, and in the step of inputting the first timing signal S1 to control the conduction of the second switch tube T2 in the detecting circuit unit 30, the second switch tubes T2 in the detecting circuit units 30 (corresponding to the pixel circuit units of the same color) in the same group are controlled to be separately conducted respectively, so as to obtain the potentials of the anodes of the electroluminescent elements D in the corresponding pixel circuit units 20 in different time periods respectively. In addition, a second switch tube T2 in each group of detecting circuit units 30 can be controlled to be turned on individually in the same time period, so as to obtain the potential of the anode of the electroluminescent element D in the corresponding pixel circuit unit 20 in the same time period.
Alternatively, during the detecting phase, the potential of the first timing signal S1 and the potential of the second timing signal S2 may not be required, and it is sufficient that the electroluminescent device D emits light, but in order to reduce the influence of the detecting phase on the electroluminescent device D, it is recommended that the potentials of the first timing signal S1 and the second timing signal S2 are as small as possible.
The first timing signal S1 can be modified to be the anode voltage compensation signal by detecting the potential difference of the anode of the electroluminescent device D each time, without limitation, as long as the first timing signal S1 used in each detection period is kept the same, and the second timing signal S2 used in each detection period is kept the same.
Step S12: a display stage: the driving chip calls the anode voltage compensation signal and outputs the anode voltage compensation signal to the corresponding pixel circuit unit.
Each detection circuit unit 30 in the present application further includes a reset circuit 32, and the reset circuit 32 at least includes a third switch transistor T3; optionally, the step of detecting the potential of the anode of the electroluminescent device D in each pixel circuit unit 20 further includes: before the potential of the anode of the electroluminescent element D in the corresponding pixel circuit unit 20 is acquired, the potential of the anode of the electroluminescent element D is initialized in advance.
Wherein the step of initializing the potential of the anode of the electroluminescent element D includes: the input of the second timing signal S2 controls the conduction of the first and second path terminals of the third switch tube T3, and the input of the scan signal scan controls the conduction of the first and second path terminals of the first switch tube T1, so that the reset signal (reset) terminal is conducted with the anode of the electroluminescent element D in the corresponding pixel circuit unit 20, and the potential of the anode of the electroluminescent element D is initialized.
Alternatively, in the process of detecting the potential of the anode of the electroluminescent device D in the group of pixel circuit units 20 corresponding to one detection circuit unit 30 (including the process of initializing the anode), the second timing signal S2 is input to control the first path terminal and the second path terminal of the third switch tube T3 to be continuously conducted, so that the electroluminescent device D continuously emits light, thereby reducing the influence of the detection phase on the electroluminescent device D.
Referring to fig. 5, fig. 5 is a schematic flowchart of a display phase according to an embodiment of a driving method of a pixel circuit of the present application. Each pixel circuit unit 20 further includes a storage capacitor C and a current control driving transistor (T5) coupled to the anode of the electroluminescent element D, and the selection circuit of each detection circuit unit 30 further includes a tenth switch transistor T10.
Optionally, the display stage may specifically include:
step S121: the signal writing process is performed on the storage capacitor C in each pixel circuit unit 30.
The step of performing signal writing processing on the storage capacitor C in each pixel circuit unit 30 includes: the tenth switch tube T10 in the detection circuit unit 20 is controlled to be in a conducting state, and the circuit between the tenth switch tube T10 and the storage capacitor C in the corresponding pixel circuit unit 30 is controlled to be in a conducting state, so that the driving chip 10 is electrically connected to the storage capacitor C in the corresponding pixel circuit unit 30, and further the anode voltage compensation signal in the driving chip 10 is output to the storage capacitor C in the corresponding pixel circuit unit 30.
Optionally, the step of performing signal writing processing on the storage capacitor C in each pixel circuit unit 30 further includes a step of performing initialization processing on the storage capacitor C in the corresponding pixel circuit unit 20 in advance (before signal writing); the step of performing the initialization process on the storage capacitor C in the corresponding pixel circuit unit 20 includes: the third switch tube T3 in the detection circuit unit 30 is controlled to be in a conducting state, and the circuit between the third switch tube T3 and the storage capacitor C in the corresponding pixel circuit unit 20 is controlled to be in a conducting state, so that the reset signal (reset) end and the storage capacitor C in the corresponding pixel circuit unit 20 are conducted, and the storage capacitor C is initialized.
In the step of controlling the circuit between the tenth switching tube T10 and the storage capacitor C in the corresponding pixel circuit unit 20 to be in the on state, the second switching tube T2 in the corresponding detection circuit unit 30 is controlled to be in the off state, and the tenth switching tubes T10 in the detection circuit units in the same group are controlled to be separately turned on respectively, so as to output the anode voltage compensation signal in the driver chip 10 to the storage capacitor C in the corresponding pixel circuit unit 20 at different time periods.
Step S122: the electroluminescent element D in each pixel circuit unit 30 is driven to emit light.
The step of driving the electroluminescent device D in each pixel circuit unit 20 to emit light includes: and releasing the current in the storage capacitor C to control the current control driving tube (T5) which is in a conducting state with the storage capacitor C to be in an on state, so that the corresponding electroluminescent element D is in a light-emitting state.
Alternatively, the step of driving the electroluminescent element D in each pixel circuit unit 30 to emit light further includes the step of resetting the anode of the electroluminescent element D in the corresponding pixel circuit unit 20 in advance (before causing the electroluminescent element D to emit light); the step of performing the reset process on the anode of the electroluminescent element D in the corresponding pixel circuit unit 20 includes: the third switch tube T3 in the detection circuit unit 30 is controlled to be in a conducting state, and the first switch tube T1 in the corresponding pixel circuit unit 20 is controlled to be in a conducting state, so that the reset signal (reset) end is conducted with the anode of the electroluminescent element D in the corresponding pixel circuit unit 20, so as to reset the anode potential of the electroluminescent element D.
Optionally, the reset signal used in the detection phase is different from the reset signal used in the display phase, specifically, in the detection phase, the potential of the reset signal reset is higher than the second operating voltage VSS, and the voltage difference between the reset signal reset and the second operating voltage VSS is greater than the turn-on voltage of the electroluminescent device D. In the display phase, the potential of the reset signal reset is less than or equal to the potential of the second operating voltage VSS. By the above method, the electroluminescent device D can emit light in the detection stage, so as to reduce the influence of the detection process on the electroluminescent device D.
As shown in fig. 2, each pixel circuit unit 20 further includes a fourth switching tube T4, a fifth driving tube T5, a sixth switching tube T6, a seventh switching tube T7, an eighth switching tube T8, and a ninth switching tube T9.
Specifically, in the step of performing the signal writing process to the storage capacitor C in each pixel circuit unit 20,
the step of performing initialization processing on the storage capacitor in the corresponding pixel circuit unit includes: the enable signal EM is controlled to control the first path end and the second path end of the fourth switching tube T4 to be cut off, and to control the first path end and the second path end of the sixth switching tube T6 to be cut off; controlling the scan signal scan to control the first and second pass terminals of the first switch transistor T1 to be turned off; controlling the third timing signal S3 to control the first path terminal and the second path terminal of the seventh switch transistor T7 to be turned off, and to control the first path terminal and the second path terminal of the ninth switch transistor T9 to be turned off; the second timing signal S2 is input to control the first and second path terminals of the third switch transistor T3 to be turned on, and the fourth timing signal S4 is input to control the first and second path terminals of the eighth switch transistor T8 to be turned on, so that the reset signal reset resets the storage capacitor C.
The step of outputting the anode voltage compensation signal in the driving chip 10 to the storage capacitor in the corresponding pixel circuit unit includes: the enable signal EM is controlled to control the first path end and the second path end of the fourth switching tube T4 to be cut off, and to control the first path end and the second path end of the sixth switching tube T6 to be cut off; controlling the scan signal scan to control the first and second pass terminals of the first switch transistor T1 to be turned off; controlling the fourth timing signal S4 to control the first path terminal and the second path terminal of the eighth switching tube T8 to be turned off; inputting a third timing signal S3 to control the first and second path terminals of the seventh switch T7 to be conducted, and to control the first and second path terminals of the ninth switch T9 to be conducted; the fifth timing signal S5 is input to control the first and second path terminals of the tenth switching tube T10 to be turned on, so that the driving chip 10 writes the anode voltage compensation signal into the storage capacitor C.
In the foregoing step, the fifth driving transistor T5 is also in the conducting state, because the storage capacitor C will retain a certain current after the initialization process is completed, and this part of the current will be input to the control terminal of the fifth driving transistor to control the first path terminal and the second path terminal of the fifth driving transistor T5 to be conducted, at this time, the tenth switching transistor T10, the ninth switching transistor T9, the fifth driving transistor T5 and the seventh switching transistor T7 are all in the conducting state, the driving chip 10 can write the anode voltage compensation signal into the storage capacitor C, and at the same time, a part of the current output by the first path terminal of the seventh switching transistor T7 will flow into the control terminal of the fifth driving transistor T5 to control the first path terminal and the second path terminal of the fifth driving transistor T5 to be in the conducting state.
Specifically, in the step of driving the electroluminescent element D in each pixel circuit unit 20 to emit light,
the step of performing the reset process on the anode of the electroluminescent element D in the corresponding pixel circuit unit 20 includes: the enable signal EM is controlled to control the first path end and the second path end of the fourth switching tube T4 to be cut off, and to control the first path end and the second path end of the sixth switching tube T6 to be cut off; controlling the third timing signal S3 to control the first path terminal and the second path terminal of the seventh switch transistor T7 to be turned off, and to control the first path terminal and the second path terminal of the ninth switch transistor T9 to be turned off; controlling the fourth timing signal S4 to turn off the first and second pass terminals of the eighth switch T8, and inputting the scan signal scan to turn on the first and second pass terminals of the first switch T1; the second timing signal is input to control the first and second path terminals of the third switching tube T3 so that the reset signal reset resets the anode potential of the electroluminescent element D.
The step of causing the corresponding electroluminescent element D to be in a light-emitting state includes: the scan signal scan is controlled to control the first path end and the second path end of the first switch tube T1 to be cut off; controlling the third timing signal S3 to control the first path terminal and the second path terminal of the seventh switch transistor T7 to be turned off, and to control the first path terminal and the second path terminal of the ninth switch transistor T9 to be turned off; controlling the fourth timing signal S4 to control the first path terminal and the second path terminal of the eighth switching tube T8 to be turned off; the enable signal EM is input to control the first and second path terminals of the fourth switching transistor T4 to be conducted, and control the first and second path terminals of the sixth switching transistor T6 to be conducted, so that the electroluminescent device D emits light.
The driving method provided by the present application is a continuous process, specifically, the scanning signal scan is controlled to scan the pixel circuit units 20 arranged along the first direction line by line (second direction), and the pixel circuit units 20 located in the same line (second direction) and connected to the detection circuit units located in different groups are synchronously scanned to initialize the storage capacitor C, write the storage capacitor C in a signal, reset the anode potential of the electroluminescent element D, and emit light by the electroluminescent element D; sequentially scanning each pixel circuit unit 20 located in the same row (second direction) and connected to the detection circuit units located in the same group to perform initialization of the storage capacitor C, signal writing of the storage capacitor C, anode potential reset of the electroluminescent element D, and light emission of the electroluminescent element D; at the same time, the pixel circuit units 20 in the same column (first direction) are sequentially scanned to perform initialization of the storage capacitor C, signal writing of the storage capacitor C, anode potential reset of the electroluminescent element D, and light emission processing of the electroluminescent element D; that is, when initializing the storage capacitor C in the pixel circuit unit 20 in the fourth column, signal writing is performed to the storage capacitor C in the pixel circuit unit 20 in the third column in which the initialization of the storage capacitor C is completed, the anode potential of the electroluminescent element D in the pixel circuit unit 20 in the second column in which the signal writing of the storage capacitor C is completed is reset, and the electroluminescent element D in the pixel circuit unit 20 in the first column in which the anode potential of the electroluminescent element D is reset is caused to emit light.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a display panel according to an embodiment of the present application. In the present embodiment, the display panel includes a substrate 41 and a pixel circuit 42 disposed on the substrate 41. The pixel circuit 42 may be the pixel circuit in any of the embodiments described above.
The substrate 41 may be a rigid substrate or a flexible substrate, which is not limited in this embodiment.
The pixel circuit comprises a driving chip, a plurality of pixel circuit units and a plurality of detection circuit units, wherein the pixel circuit units and the detection circuit units are connected with the driving chip, and the detection circuit units are used for conducting the driving chip and anodes of electroluminescent elements in the corresponding pixel circuit units. Therefore, the driving chip can conveniently acquire the anode potential of the electroluminescent element, the anode potential can be compensated in the subsequent display stage conveniently, the circuit can be better fused with the pixel circuit unit, the circuit structure is simple, the detection stage and the display stage are designed independently, the detection stage cannot influence the display stage, the detection circuit units of at least two pixel circuit units (through the corresponding detection circuit units) corresponding to the electroluminescent elements with the same color are connected through the connecting terminals, and the connecting terminals are connected with the same pin of the driving chip, so that the pins on the driving chip can be saved, and the hardware resource can be saved.
The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.
Claims (18)
1. A pixel circuit is characterized by comprising a driving chip, a plurality of pixel circuit units and a plurality of detection circuit units, wherein the pixel circuit units and the detection circuit units are connected with the driving chip, each detection circuit unit respectively and independently corresponds to a group of pixel circuit units arranged along a first direction and is selectively coupled and connected with each pixel circuit unit in the group of pixel circuit units, and the first direction is the row direction or the column direction of the pixel circuit units arranged in an array; wherein,
each pixel circuit unit at least comprises a first switch tube and an electroluminescent element, wherein one passage end of the first switch tube is electrically connected with the anode of the electroluminescent element, and the control end of the first switch tube is connected with a scanning signal end;
each detection circuit unit at least comprises a selection circuit, the selection circuit at least comprises a second switch tube, a first path end of the second switch tube is connected with an anode of an electroluminescent element in the second switch tube through a corresponding pixel circuit unit, a control end of the second switch tube is connected with a first time sequence signal end, and a second path end of the second switch tube is connected with the driving chip;
when the second switch tube in the detection circuit unit is in a conducting state and the first switch tube in the pixel circuit unit coupled with the second switch tube is also in a conducting state, the driving chip detects the potential of the anode of the electroluminescent element in the pixel circuit unit corresponding to the first switch tube in the conducting state;
the plurality of detection circuit units are divided into a plurality of groups, each group comprises at least two detection circuit units, and the detection circuit units in each group are connected through connecting terminals and correspondingly connected with the same pin of the driving chip through the connecting terminals; the electroluminescent elements in the pixel circuit units in the same row, which are correspondingly connected with the detection circuits in each group, have the same luminous color.
2. The pixel circuit according to claim 1, wherein the first switching tube in each of the pixel circuit units arranged along a second direction is connected to the same scanning signal terminal, and the second direction is different from the first direction and is a column direction or a row direction of the pixel circuit units arranged in an array.
3. The pixel circuit according to claim 1,
each detection circuit unit further comprises a reset circuit, the reset circuit at least comprises a third switch tube, a first passage end of the third switch tube is connected with the anode of the electroluminescent element through the corresponding pixel circuit unit, a control end of the third switch tube is connected with a second time sequence signal end, and a second passage end of the third switch tube is connected with a reset signal end.
4. The pixel circuit according to claim 3,
each pixel circuit unit further comprises a storage capacitor and a current control driving tube coupled with the anode of the electroluminescent element, wherein one end of the storage capacitor is selectively coupled with the driving chip, and the other end of the storage capacitor is selectively coupled with the control end of the current control driving tube, and is used for receiving and storing an anode voltage compensation signal from the driving chip and controlling the current control driving tube according to the anode voltage compensation signal.
5. The pixel circuit according to claim 4, wherein the first pass terminal of the third switch in each of the detecting circuit units is coupled to the storage capacitor in the corresponding pixel circuit unit for selectively resetting the storage capacitor.
6. The pixel circuit according to claim 4, wherein the selection circuit further comprises a tenth switching tube, a first path end of the tenth switching tube is coupled to one end of the storage capacitor, a second path end of the tenth switching tube is connected to the connection terminal and the driving chip, and a control end of the tenth switching tube is connected to a fifth timing signal end.
7. The pixel circuit according to claim 4, wherein each of the pixel circuit units further includes a fourth switching tube, a fifth driving tube, a sixth switching tube, a seventh switching tube, an eighth switching tube and a ninth switching tube, and the selection circuit of each of the detection circuits further includes a tenth switching tube, wherein the fifth driving tube is the current control driving tube;
a first path end of the fourth switching tube is connected with a first working voltage end, a second path end of the fourth switching tube is connected with a first path end of a fifth driving tube and a second path end of the ninth switching tube, and a control end of the fourth switching tube is connected with an enabling signal end;
a second path end of the fifth driving tube is connected with a first path end of the sixth switching tube and a second path end of the seventh switching tube, and a control end of the fifth driving tube is connected with a second end of the storage capacitor;
the second path end of the sixth switching tube is connected with the second path end of the first switching tube and the anode of the electroluminescent element, and the control end of the sixth switching tube is connected with the enable signal end;
the first path end of the seventh switching tube is connected with the control end of the fifth driving tube, and the control end of the seventh switching tube is connected with a third timing signal end;
a first path end of the eighth switching tube is connected with a second end of the storage capacitor, a second path end of the eighth switching tube is connected with a first path end of the second switching tube and a first path end of the third switching tube, and a control end of the eighth switching tube is connected with a fourth timing signal end;
the first path end of the ninth switching tube is connected with the first path end of the fifth switching tube, the second path end of the ninth switching tube is connected with the first path end of the tenth switching tube, the second path end of the tenth switching tube is connected with the connecting terminal and the driving chip, the control end of the ninth switching tube is connected with the third timing signal end, and the control end of the tenth switching tube is connected with the fifth timing signal end;
the first end of the storage capacitor is connected with the first working voltage, the cathode of the electroluminescent element is connected with the second working voltage, the first path end of the second switch tube is connected with the first path end of the first switch tube, and the first path end of the third switch tube is connected with the first path end of the first switch tube.
8. The pixel circuit according to claim 7, wherein the seventh switch tube and the eighth switch tube are both dual-gate switch tube structures, each dual-gate switch tube structure includes a first sub-switch tube and a second sub-switch tube, gates of the first sub-switch tube and the second sub-switch tube are connected together to serve as a control end of the dual-gate switch tube structure, a first pass end of the first sub-switch tube serves as a first pass end of the dual-gate switch tube structure, a second pass end of the second sub-switch tube serves as a second pass end of the dual-gate switch tube structure, and the second pass end of the first sub-switch tube and the first pass end of the second sub-switch tube are connected.
9. A driving method of the pixel circuit according to any one of claims 1 to 8, wherein the driving method comprises:
detecting the electric potential of the anode of the electroluminescent element in each pixel circuit unit, and recording the electric potential of the anode of the electroluminescent element in the driving chip to form an anode voltage compensation signal; each pixel circuit unit at least comprises a first switching tube and an electroluminescent element; each detection circuit unit at least comprises a selection circuit, and the selection circuit at least comprises a second switch tube; the step of detecting the potential of the anode of the electroluminescent element in each pixel circuit unit comprises: inputting a first timing signal to control the conduction of a second switch tube in the detection circuit unit, and inputting a scanning signal to control the conduction of a first switch tube in the corresponding pixel circuit unit so as to enable the conduction of the driving chip and the anode of the electroluminescent element in the corresponding pixel circuit unit, and further obtain the potential of the anode of the electroluminescent element;
the driving chip calls the anode voltage compensation signal and outputs the anode voltage compensation signal to a corresponding pixel circuit unit;
the pixel circuit comprises a plurality of pixel circuit units, wherein the pixel circuit units are divided into a plurality of groups, each group comprises at least two detection circuit units, the detection circuit units in each group are connected through connecting terminals and correspondingly connected with the same pin of the driving chip through the connecting terminals, and in the step of inputting a first time sequence signal to control the conduction of a second switch tube in the detection circuit units, the second switch tubes in the detection circuit units in the same group are controlled to be respectively and independently conducted, so that the potentials of the anodes of the electroluminescent elements in the corresponding pixel circuit units are respectively obtained in different time periods.
10. The driving method as claimed in claim 9, wherein each of the detecting circuit units further comprises a reset circuit, the reset circuit at least comprises a third switching tube;
the step of detecting the potential of the anode of the electroluminescent element in each pixel circuit unit further comprises: before acquiring the potential of the anode of the electroluminescent element in the corresponding pixel circuit unit, carrying out initialization processing on the potential of the anode of the electroluminescent element;
wherein the step of initializing the potential of the anode of the electroluminescent element includes: and inputting a second time sequence signal to control the conduction of the third switching tube, and inputting a scanning signal to control the conduction of the first switching tube so as to ensure that a reset signal end is conducted with the anode of the electroluminescent element in the corresponding pixel circuit unit, and further initialize the potential of the anode of the electroluminescent element.
11. The driving method according to claim 10,
in the process of detecting the electric potential of the anode of the electroluminescent element in a group of pixel circuit units corresponding to one detection circuit unit, inputting a second time sequence signal to control the continuous conduction of the first passage end and the second passage end of the third switching tube.
12. The driving method as claimed in claim 9, wherein each pixel circuit unit further comprises a storage capacitor and a current control driving transistor coupled to the anode of the electroluminescent device, the selection circuit of each detection circuit unit further comprises a tenth switching transistor,
the driving method includes:
performing signal writing processing on the storage capacitor in each pixel circuit unit; the step of writing the signal into the storage capacitor in each pixel circuit unit comprises: controlling a tenth switching tube in the detection circuit unit to be in a conducting state, and controlling a circuit between the tenth switching tube and a storage capacitor in a corresponding pixel circuit unit to be in a conducting state, so that the driving chip is electrically communicated with the storage capacitor in the corresponding pixel circuit unit, and further an anode voltage compensation signal in the driving chip is output to the storage capacitor in the corresponding pixel circuit unit; and
driving the electroluminescent element in each pixel circuit unit to emit light; the step of driving the electroluminescent element in each pixel circuit unit to emit light comprises: releasing the current in the storage capacitor to control the current in a conduction state with the storage capacitor to control the driving tube to be in a turn-on state, so that the corresponding electroluminescent element is in a light-emitting state;
in the step of controlling the circuit between the tenth switch tube and the storage capacitor in the corresponding pixel circuit unit to be in a conducting state, the second switch tube in the corresponding detection circuit unit is controlled to be in a stopping state, and the tenth switch tubes in the detection circuit units in the same group are controlled to be respectively and independently conducted, so that the anode voltage compensation signal in the driving chip is output to the storage capacitor in the corresponding pixel circuit unit in different time periods.
13. The driving method according to claim 12, wherein the step of performing signal writing processing on the storage capacitor in each pixel circuit unit further includes a step of performing initialization processing on the storage capacitor in the corresponding pixel circuit unit in advance; the step of performing initialization processing on the storage capacitor in the corresponding pixel circuit unit includes: controlling a third switching tube in the detection circuit unit to be in a conducting state, and controlling a circuit between the third switching tube and a storage capacitor in a corresponding pixel circuit unit to be in a conducting state, so that the reset signal end is conducted with the storage capacitor in the corresponding pixel circuit unit, and further initializing the storage capacitor;
driving the electroluminescent element in each pixel circuit unit to emit light, and resetting the anode of the electroluminescent element in the corresponding pixel circuit unit in advance; the step of performing reset processing on the anode of the electroluminescent element in the corresponding pixel circuit unit includes: and controlling the third switching tube in the detection circuit unit to be in a conducting state, and controlling the first switching tube in the corresponding pixel circuit unit to be in a conducting state, so that the reset signal end is conducted with the anode of the electroluminescent element in the corresponding pixel circuit unit, and the current control driving tube is reset to the anode potential of the corresponding electroluminescent element.
14. The driving method according to claim 13, wherein each of the pixel circuit units further comprises a fourth switching tube, a fifth driving tube, a sixth switching tube, a seventh switching tube, an eighth switching tube and a ninth switching tube,
in the step of performing signal writing processing to the storage capacitor in each pixel circuit unit,
the step of performing initialization processing on the storage capacitor in the corresponding pixel circuit unit includes: controlling the fourth switching tube, the sixth switching tube, the first switching tube, the seventh switching tube and the ninth switching tube to be cut off; the third switching tube and the eighth switching tube are controlled to be conducted, so that the storage capacitor is reset by the reset signal;
the step of outputting the anode voltage compensation signal in the driving chip to the storage capacitor in the corresponding pixel circuit unit comprises the following steps: controlling the fourth switching tube, the sixth switching tube, the first switching tube and the eighth switching tube to be cut off; the fifth driving tube, the seventh switching tube, the ninth switching tube and the tenth switching tube are controlled to be conducted, so that the driving chip writes the anode voltage compensation signal into the storage capacitor;
in the step of driving the electroluminescent element in each pixel circuit unit to emit light,
the step of performing reset processing on the anode of the electroluminescent element in the corresponding pixel circuit unit includes: controlling the fourth switching tube, the sixth switching tube, the seventh switching tube, the eighth switching tube and the ninth switching tube to be switched off, and controlling the first switching tube and the third switching tube to be switched on so that the reset signal resets the anode potential of the electroluminescent element;
the step of causing the corresponding electroluminescent element to be in a light-emitting state includes: and controlling the first switching tube, the seventh switching tube, the eighth switching tube and the ninth switching tube to be switched off, and controlling the fourth switching tube, the fifth driving tube and the sixth switching tube to be switched on, so that the electroluminescent element emits light.
15. The driving method according to claim 9, wherein the first switching tubes in each of the pixel circuit units arranged in the second direction share the same scanning signal; the first switching tubes in each pixel circuit unit arranged along the first direction are respectively and independently connected with corresponding scanning signals; and in the detection stage and the display stage, each pixel circuit unit in the pixel circuit is scanned line by line along a first direction.
16. The driving method as claimed in claim 9, wherein the third switching tubes in the detection circuit unit share the same second timing signal and the same reset signal corresponding to the pixel circuit units arranged along the second direction.
17. The driving method as claimed in claim 9, wherein the control terminal of the second switch in the detection circuit unit is connected to different first timing signals according to the light emitting color of the electroluminescent element in the corresponding pixel circuit unit, corresponding to the pixel circuit units arranged along the second direction.
18. A display panel comprising a substrate and a pixel circuit provided on the substrate, wherein the pixel circuit is the pixel circuit according to any one of claims 1 to 8.
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Application publication date: 20190329 |